US3865117A

US3865117A - Thermal compress and method and apparatus for making the same

Info

Publication number: US3865117A
Application number: US373436A
Authority: US
Inventors: Iii Thomas William Perry
Original assignee: Micro Bio Medics Inc
Current assignee: Micro Bio Medics Inc
Priority date: 1973-06-25
Filing date: 1973-06-25
Publication date: 1975-02-11
Anticipated expiration: 1992-02-11

Abstract

A thermal compress has an outer container defining an inner space. An inner wall provided within the container divides the space into two separate compartments each bounded in part by the outer container in one embodiment of the invention. A control is physically associated with the wall to provide, on the application of manual forces to the container, a passage through the wall at a localized and predictable position. Different substances are respectively located in the above mentioned compartments and separated by the wall until the formation of the passage through the wall whereupon the substances contact each other and perform a thermal reaction to provide heat or cold. With respect to the outer container, two sheets are connected together to form the inner space with a wall being provided in the inner space to divide the same into two compartments with the aforesaid substances being respectively located in these compartments and adapted on contact to effect a thermal reaction. As one form of control, a tear strip is connected between the sheets and to the wall to enable tearing a passage into the wall to permit the substances to mix. Preferably the tear sheet is connected to the wall along a V-shaped seam adapted to form a passage through the wall at a localized and predictable position.

Description

limited tates Perry, 111

cut [1 1 [4 1 Feb. 11,1975

[ 1 THERMAL COMPRESS AND METHOD AND APPARATUS FOR MAKING THE SAME [75} Inventor: Thomas William Perry, 111, Brick Town, NJ.

[73] Assignee: Micro Bio-Medics llnc.,

Mamaroneck, NY.

[22] Filed: June 25, 1973 [21] App]. No.: 373,436

[56] References Cited UNlTED STATES PATENTS 5/1952 Bowen 128/403 X 3,175,558 3/1965 Caillovette et a1 128/403 3,763,622 10/1973 Stanley 53/25 FOREIGN PATENTS OR APPLICATIONS 838,195 6/1960 Great Britain 62/4 Primary Examiner-Lawrence W. Trapp Attorney, Agent, or Firm-Roberts & Cohen [57] ABSTRACT A thermal compress has an outer container defining an inner space. An inner wall provided within the container divides the space into two separate compartments each bounded in part by the outer container in one embodiment of the invention. A control is physically associated with the wall to provide, on the application of manual forces to the container, a passage through the wall at a localized and predictable position. Different substances are respectively located in the above mentioned compartments and separated by the wall until the formation of the passage through the wall whereupon the substances contact each other and perform a thermal reaction to provide heat or cold. With respect to the outer container, two sheets are connected together to form the inner space with a wall being provided in the inner space: to divide the same into two compartments with the aforesaid substances being respectively located in these compartments and adapted on contact to effect a thermal reaction. As one form of control, a tear strip is connected between the sheets and to the wall to enable tearing a passage into the wall to permit the substances to mix. Preferably the tear sheet is connected to the wall along a V- shaped seam adapted to form a passage through the wall at a localized and predictable position.

18 Claims, 8 Drawing Figures THERMAL COMPRESS AND METHOD AND APPARATUS FOR MAKING. THE SAME FIELDOF INVENTION This invention relates to thermal compresses and to apparatus and methods for preparing the same. The invention relates more particularly to thermal compresses adapted upon manipulation to provide a source of heat or a cooling compress.

BACKGROUND It is known to provide thermal compresses in the form, for example, of a plastic envelope containing a chemical which absorbs heat on the addition of water thereto and in which the water is retained in a separate envelope which is susceptible of being ruptured so that thenecessary thermal change or thermal reaction will take place when the water is permitted to come together with the aforementioned chemical. Such an article of manufacture is described, for example, in US. Pat. No. 2,907,173 which issued to A. Robbins on Oct. 6, 1959. In this patent is described a refrigerating package which includes an outer sealed envelope coated with a metallic foil and containing a dry freezing chemical mixture with a sealed envelope contained within the outer sealed envelope and containing a hydrous substance, the inner envelope being susceptible of being ruptured without breaking the outer envelope. This patent discloses, among other chemicals, the use of ammonium nitrate, sodium carbonate and the like which upon being exposed to water or to a hydrous chemical form a cooling mixture. The envelopes in which the chemicals are retained and in which the water or hydrous chemical are retained are fabricated, for exam ple, of polyethylene, vinyl or acetate. The inner bag is sufficiently thin that when the compress is twisted or compressed, the inner envelope is torn permitting the material therein'to escape and intermingle or mix with the other chemical contained in the outer envelope.

A further description of a thermal compress in the form ofa refrigerating package is given in US. Pat. No. 2,925,719 which issued on Feb. 23, 1960 to A. Robbins et al. This patent describes a refrigerating package comprising a sealed outer envelope formed of flexible fluid-tight transparent sheet plastic material, a refrigerating chemical disposed within this outer envelope, a water soluble coloring dye disposed in the outer envelope and a sealed water containing inner envelope formed of a flexible fluid-tight transparent sheet plastic material disposed within the outer envelope. The inner envelope is of smaller dimensions and has a lower bursting strength than the outer envelope. The interior of the outer envelope is partially evacuated of air and the water within the inner envelope is normally isolated from the refrigerating chemical. The exterior surfaces of the walls of the inner envelope are directly engageable by the interior surfaces of the walls ofthe outer envelope whereby an inwardly directing force applied against the outer envelope imposes a direct mechanical force on the inner envelope to rupture the latter without breaking the outer envelope. Thereby there is effected the mixing of the water with the refrigerating chemical and with a coloring dye.

Among the problems of the packages provided by A. Robbins in the aforesaid patents is the problem that sometimes considerable force is required to burst the inner envelope in order to provide for a mixing of the thermally reactive chemicals. In addition it is sometimes found that a certain technique is required to burst the inner envelopes and that this technique is not always easily effected. In addition there are problems of premature liquid leakage and furthermore it is not possible to construct packages of predictable operation since it is not possible to predict where the inner envelopes will burst and the degree to which there will exist a passageway between the substance contained in the inner envelopes and the substance surrounding the same.

Some of the above problems are to a slight extent solved by Caillouette et al in US. Pat. No. 3,175,558 which issued on Mar. 30, I965. Herein is described a therapeutic pack for the thermal treatment of a person which pack includes a container bag of flexible proof material, chemical substances within the container bag including a liquid component and a separate non-liquid component for producing a temperature changing reaction upon the mixture of these components within the bag, there being provided a fracturable section for containing the liquid component apart from the other component so that the components can be controllably mixed to give the desired thermal result. In this patent is furthermore described the coating of at least a portion of one of the chemical components with a soluble coating in order that the mixing of the substances be spread out over a greater period of time. In addition, there is described an absorbent pad corresponding in size to the container bag and a wrapper of flexible material for holding the pad and the container bag together whereby the pad can be held. adjacent to the person being treated.

The difficulty with one embodiment of the invention disclosed by Caillouette et al is that the solid chemical substance is generally retained all in one portion of the resulting enclosure after the chemicals are permitted to mix, while at the same time, the package provided is of extended length and difflcult to pack and ship as well as to manufacture with a high degree of consistency as regards the subsequent usage thereof. This embodiment employs opening tabs but employs them in a construction wherein the fluid forces which are exerted on the closure between the substances can be expected to lead to fluid leakage and consequently premature operation of the package. The other embodiment disclosed by Caillouette et al is subject to the same deficiencies as have been noted hereinabove with respect to the Robbins Patents.

SUMMARY OF INVENTION It is an object of the invention to provide an improved thermal compress and improved apparatus and methods for manufacturing the same.

It is a further object of the invention to provide an improved thermal compress having an improved style of operation.

Still another object of the invention is to provide an improved thermal compress capable of retaining two substances in isolated relationship until the time arrives for the using of the compress at which time a passage can be provided between the substances at a localized and predictable location.

Another object of the invention is to provide an improved thermal compress having a high degree of safety as regards the possiblity of leakage of one substance into the other substance which is intended to react therewith.

Still another object of the invention is to provide an improved thermal compress which requires a low degree of strength to provide for intermixing the substances which are to react thermally.

To achieve the above and other objects of the invention, in accordance with one generalized embodiment thereof, there is provided a thermal compress comprising an outer container defining an inner space, an inner wall within said container dividing said space into two separate compartments each bounded in part by said outer container, control means physically associated with said wall to provide, on the application of at least one manual force to the container, a passage through the wall at a localized end predictable position, and first and second chemicals respectively located in said L compartments and separated by said wall until the formation of said passage, said first and second chemicals upon contacting one another, after the formation of said passage, performing a thermal function such as generating heat or providing for a cooling action.

In accordance with a preferred form of the above embodiment, the outer container includes two sheets connected together along a closed line through the intermediary of the aforesaid wall. Preferably the sheets and wall are peripherally sealed together.

Advantageously an insulation means can be loosely accommodated within at least one of the aforesaid compartments.

According to a preferred embodiment of the invention, the aforementioned control means includes a tear strip connected to the aforesaid wall. Advantageously the sheets and wall are flexible and the control device is operatively associated therewith. Apart from being a tear strip as described above, the control means may be a generally rigid frangible member provided in the wall and adapted for being broken to provide the localized and predictably located passage.

In further accordance with the invention, the aforementioned sheets and wall may be ofa plastic of similar gauge. Also, advantageously, the aforementioned strip may be connected to the wall along a V-shaped seal in order to provide for the localized and predictable opening in the wall which isolates the chemical substances from one another. The aforementioned strip may preferably be of a thicker gauge than the wall to which it is connected.

According to still a further aspect of the invention, a further sheet may be connected to one of the first said sheets and may form an insulating compartment therewith.

Where the tear strip is employed, and as will be described in greater detail hereinafter, the sheets and wall are correspondingly bent for effectively shortening the length thereof. The tear strip in this case has a shorter effective length than the sheets and wall so that, upon a straightening of the sheets and wall, the tear sheet tears the passage into the wall at the above-mentioned position.

As a further aspect of the invention, the compress may be provided with an indicator to indicate where the tear strip is sealed between the wall and the associated sheet to facilitate the tearing operation mentioned hereinabove.

The method of the invention for making a thermal compress comprises sandwiching a wall between two sheets and connecting the sheets to the wall along a closed line to form separate compartments which are charged with a respective thermally reactive substance. The method further comprises leaving an opening into each said compartment through the aforementioned line then charging the compartment with respective of said substances through the openings and then closing each said opening.

The walls and sheets are formed of a flexible plastic and are heat sealed along the aforesaid line. As provided in accordance with one embodiment of the invention, the wall may be provided with a rigid frangible part. According to another embodiment of the invention, the tear strip mentioned above is sealed to the above mentioned wall on one side of the latter and is, at its other extremity, sealed between the wall and one of said sheets.

The method of the invention includes bending the wall and the sheets as well as said tear strip transversely of the latter and, before the tear strip is sealed between the wall and the associated sheet, at least partly straightening the tear strip to decrease the effective length thereof relative to that of the wall and associated sheets.

As has been noted hereinabove the method of the invention may comprise sealing the tear strip to the one side of the wall along a V-shaped seam. The invention may comprise, as a particularly advantageous form thereof, loading foam plastic elements into at least one of the compartments to form an insulation layer.

The apparatus of the invention will comprise sources of three sheets of plastic, guides to guide the same into face-to-face relationship with one of the sheets sandwiched between the other two sheets to form a wall therebetween, sealing devices to seal the sheets together to form two pockets separated by the aforesaid wall and supplies to supply into respective of the pockets substances which when mixed result in a thermal change as noted hereinabove. In addition the apparatus will include sealing devices to seal the aforesaid pockets closed.

According to the invention, the apparatus provided in accordance therewith will include means to apply to the wall a device for controllably forming in the wall a passage through which the aforesaid substances can be mixed. The aforesaid means may include a source of a strip and a sealing means to seal the strip to the wall. Also there may be included means to bend the sheets and strip transversely of the latter and means to straighten the strip at least in part before the pockets are sealed closed.

The guides mentioned hereinabove may include at least one concave roller to provide for the admission of at least one of the substances into one of the pockets and to permit the abovementioned straightening of the tear strip.

With the above indicated apparatus there may be formed a thermal compress comprising two sheets connected together to form an inner space, a wall in the inner space to divide the same into two compartments, chemicals in the-compartments adapted on contact to effect a thermal reaction. and a tear strip connected between the sheets and to the side wall to enable a tearing of a passage into the wall to permit the substances to mix.

The construction may be such that the compartments are preferably and respectively bounded by the aforesaid sheets. However, it is also possible that the tear strip may be used in a construction where the compartments are arranged so that one of these compartments is spaced from the associated sheets.

The above objects and features of the invention as well as advantages thereof will be better understood from the following detailed description of some preferred embodiments as illustrated in the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING In the drawing:

FIG. I is a front view of a thermal compress provided in accordance with one embodiment of the invention;

FIG. 2 is a sectional view taken along section llll of FIG. 1;

FIG. 3 is a diagrammatic illustration of the operation of the tear strip of the invention;

FIG. 4 illustrates a further embodiment of the invention with the thermal compress straightened out to tear a passage into the intervening wall;

FIG. 5 is a view similar to FIG. 4 illustrating a further embodiment of the invention;

FIG. 6 illustrates a further embodiment of the invention wherein the tear strip is employed with a compartment contained in entirety within an outer container;

FIG. 7 is a plan view of an intervening wall employed in accordance with a further embodiment of the invention; and

FIG. 8 diagrammatically illustrates the method and apparatus of the invention.

DETAILED DESCRIPTION The invention is generally concerned with a thermal compress which can be operated by means of an activator strip or the like or by the use of a precisely located rigid and frangible member. The thermal compress of the invention enables the use of a foam plastic of greater thickness or of desired thickness for the separator walls or inner envelopes to avoid leakage problems while still enabling the facile activation of the chemicals.

The invention relates moreover to a construction and to methods and apparatus for forming a plurality or multitude of compartmented bags which can be activated as has been described generally above while being capable of being automatically fabricated. The techniques of the invention can be used with therapeutic hot packs or cold packs in turn involving exothermic or endothermic reactions.

By the use of the expression thermal compress is intended to be meant packages capable upon manipulation of mixing two previously isolated chemicals or substances to perform a thermal reaction which is either exothermic or endothermic, as noted above, whereby in one type of package depending upon the chemicals involved there may be generated heat while in another type of package due to the chemicals involved there may be generated a cooling effect.

In the FIGS. 1 and 2 is illustrated a thermal compress it) provided in accordance with one embodiment of the invention. This thermal compress includes two outer walls or sheets 12 and I4 sealed together along edges 16, I8, and 22.

Sandwiched between the

sheets

12 and 14 is a third sheet 24 which constitutes a separator wall which divides the inner space formed between the

sheets

12 and 14 into two

compartments

26 and 28. It will be particularly noted in FIG. 2 that the wall 24 is peripherally sealed to the

sheets

12 and 14 as, for example. indicated at 30 and 32.

In the compartment 26 is contained a chemical 34 such as has been noted above and inclusive by way of example of the following: NflgCOa'HgO; NH Cl; Na S0 KI; CaCl and NH NO.

In the compartment 28 is located a hydrous chemical or water 36 capable, on intermixing with the chemical 34, of effecting an exothermic or endothermic reaction as has been mentioned hereinabove.

To provide for a passage in a localized and predictable position so that the fluid in compartment 28 can pass into the compartment 34 and vice-versa, there is included in accordance with the invention a tear strip 38. This tear strip is connected at its extremity 40 between the

edges

42 and 44 of

sheets

12 and 14 respectively. At its other extremity, it is connected such as by heat sealing to the wall 24. This latter extremity is indicated at 46, there being a reversed bend 48 provided in the tear strip 38 as results from the manufacturing technique to be described hereinafter.

In FIG. 1, it will be noted that the connection between the extremity 46 of tear strip 38 to the wall 24 is provided along a V-shaped seam 48, the purpose of this seam being to provide a localized and highly predictable position for the passage to be formed upon the manipulation of the thermal compress of the invention as next described hereinbelow.

Examination of FIG. 2 will show that the effective lengths of

sheets

12 and 14 as well as wall 24 is greater than the effective length of the tear strip 38. Sheet 14 and wall 24 have a greater effective length than tear strip 38 between the respective ends thereof due to the fact that the angle T formed by the tear strip 38 is smaller than the angle W formed by the wall 24 and the angle S formed by the sheet 14. Tear strip 28 has a greater effective length than the sheet 12 because the latter is wrinkled or, in other words, follows a serpentine path due to the bending or folding of the thermal compress. As a result, when the extremities of the thermal compress are pulled in the direction indicated by the

arrows

50 and 52, by forces exerted at indicator I and at a position opposite the same, the tear strip 38 will be the first element of the aforediscussed elements to reach its fully extended length and thereafter the forces will cause the extremity 46 to pull against the wall 24 whereupon a passage will be initiated along the seam 48 which has been discussed hereinabove. This passage will be highly localized and highly predictable since it will occur specifically at the seam 48 and will occur upon the facile administration of forces of a relatively low magnitude.

It is to be noted that in accordance with the invention, the tear strip 38 may be fabricated of a plastic which is preferably of a larger gauge than the gauge of the

sheets

12 and 14 and the sheet or wall 24. All of these elements can be fabricated of a plastic such as, for example, polyethylene, vinyl or any other suitable plastic capable of retaining water or a hydrous chemical and inert to the chemicals concerned. As will be seen hereinafter, the outer sheets as well as the separator wall may be connected along a closed line. the sheets and wall being preferably peripherally sealed together.

Indicated at 54 are a plurality of foam plastic elements such as small plastic balls or spheres which, when the device is operated to mix the thermally reacting chemicals, will float on the liquid and form an insulating layer. This feature can advantageously be employed to prolong the cold effect or to prevent excessive heat from reaching the skin in case of the provision of a therapeutic hot pack.

FIG. 3 diagrammatically illustrates the effect of the tear strip 38 with respect to the wall 24. When the force indicated by arrow 56 is exerted on the extremity of the tear strip 38 which is not connected to the wall 24, the aforesaid passage will result along the V-shaped seam 48. It is to be noted that by use of the term V-shaped, it is not intended to limit the invention to the precise shape of a V since it will be clear that W-shaped seams and certain U-shaped seams and the like will also be capable of providing a localized and positionally predictable opening in the wall 24 in accordance with the in vention although the V-shape will be best.

FIG. 4 illustrates a further embodiment of the invention somewhat similar to that illustrated in FIGS. 1 and 2, the view in FIG. 4 illustrating the associated thermal compress after it has been straightened out to form the passage 58 and to provide for a mixing of the thermally active chemical reactants.

In FIG. 4 is illustrated a thermal

compress including sheets

60 and 62 defining an inner space which is divided by a wall 64 into

compartments

66 and 68 wherein the chemical substances mentioned hereinabove are respectively located. The embodiment also includes a tear strip 70 of the aforementioned type which is connected in the same manner as described above to provide eventually the passage 58.

In the embodiment of FIG. 4 there is additionally attached a plastic sheet 72 to provide a further compartment 74 wherein are located a multitude of foam plastic elements or spheres 76 which provide an insulating effect as has been described above.

FIG. is a view similar to FIG. 4, showing a further embodiment of the invention, including

walls

78 and 80 and further including the intervening wall 82 with which is associated the tear strip 84 for forming the passage 86 in the above-noted manner.

The embodiment of FIG. 5 includes a further sheet 88 forming an additional compartment 90 which is filled with air in order to space the wall 88 from the sheet 80 whereby to provide for ameliorating the heating or cooling effect as applied to the skin of the person using the device or being treated with the same.

The embodiment of FIG. 6 is also a thermal compress. It comprises the

outer sheets

92 and 94 forming an inner space 96 and peripherally connected at

edges

98 and 100. In this embodiment of the invention an inner wall 102 provides an inner compartment 104 entirely separated from the

sheets

92 and 94 as distinguished from the embodiments mentioned hereinabove. In each of the embodiments mentioned hereinabove, the inner compartments are bounded by the associated outer sheets whereas in the embodiment of FIG. 6, as has been mentioned above, the inner compartment is isolated from the

sheets

92 and 94. The embodiment of FIG. 6 has in common with the aforegoing embodiments, the provision of the tear strip 106 which operates in the manner mentioned hereinabove to provide a passage through which can flow the fluid or hydrous chemical 108 contained within the compartment 104.

In the embodiment of FIG. 6, the left extremities of the

sheets

92 and 94, such as indicated at 110 and 112 are wrinkled or folded or otherwise follow a serpentine contour so that a straightening of the same will apply to the tear strip 106 a force as indicated by arrow 112' to provide that the extremity 114 of the tear strip 106 generate in the compartment 104 a passage which is highly localized and predictably located.

A further embodiment of the invention is illustrated in FIG. 7 wherein the plan view of the wall 120, which is the separator wall between the two compartments, is sufficient to understand the operation of the resulting thermal compress. Herein, the wall includes a section 122 which is of a preferably rigid and frangible substance such as a plastic foam or the like.

It will be understood that since the wall 120 is of a flexible plastic, the provision of the frangible member 122 enables the breaking of the latter by a distortion of the wall 120 and the associated outer walls of the package whereby a highly localized and predictably located passage is provided in the wall 120 to enable an intermixing of the aforesaid chemicals.

The method and apparatus of the invention are best understood by reference to FIG. 8 wherein appear

sources

150, 152 and 154 of

plastic sheets

156, and 162 respectively, said sheets forming the outer sheets of the resulting thermal compress with the central sheet 160 forming the separator wall utilized therein.

Also provided is a source 164 of the tear strip 166, said source being connected by a mechanical means 168 with a reverser drive 170 for a purpose which will be described hereinafter.

For attaching the strip 166 to the central sheet 160 which forms the separator wall, there is provided a back up block 170 capable of being reciprocally moved as indicated by arrow 172 and operating in conjunction with the sealing member 174 also capable of being operated in reciprocal directions as indicated by the arrow 176. A source of heat can be provided, for example, in the form of a high-frequency heating unit 178 of known construction. Alternatively, different sources and forms of heat can be employed. The function of the sealing member 174 is, as will be consistent with the aforegoing description, to provide a V-shaped seal as indicated at 180 or a seal which is equivalent thereof so that a passage can be torn in the wall 160 in the manner which has been described hereinabove.

The apparatus illustrated in FIG. 8 includes a guide consisting in part of

rollers

182 and 184, these rollers being preferably concave in order to provide sections such as indicated at 186 for the introduction of the different chemical substances by means of

nozzles

188 and 190 or the like. In the event that foam plastic elements or spheres, as have been described above, are to be introduced, an additional source or nozzle (not shown) may be employed.

To seal the

sheets

156, 160 and 162 laterally together at their extremities which are indicated at 192 and 194, there are provided

rotary sealing elements

196, 198 and 200 as well as a fourth sealing element cooperating with the element 200 and concealed from view by the aforementioned sheets. The

elements

196, 198 and 200 are rotary elements and are supplied with energy by high-

frequency units

202 and 204 which may be of any known construction.

The lower extremity of the aforesaid sheets are received in a channel 2% whereat they are sealed together by energy supplied by highfrequency heating unit 204. it is to be understood that the arrangement indicated by sealing members we, R98 and 200 as well v as by element 206 is very diagrammatically indicated and that the detailed construction of these components of this apparatus will be obvious to those of ordinary skill in the art involved.

A bar extending transversely of the aforesaid sheets is indicated at ma. Movement of the member 266 in the direction indicated by the arrow 2110 will cause a bending of the three aforesaid sheets 1%, 160 and 1162 as well as of the strip 166 connected to the center sheet or wall 16f). The member N6 is then returned to the illustrated position which will allow a certain amount of slack in the sheets 156, we and 162 as well as in the strip 166. The

sheets

156, 160 and M2 will, however, not be drawn in reverse direction due to peripheral engagement by the rollers 182 and MM. At this time, however, the direction of rotation of the source or roller M4 is reversed by reverser drive 17% whereby the strip 366 is drawn taut or is effectively shortened in length to have a shorter effective length than the folded or bent sheets 1%, 11.60 and 162. This will have the effect of creating a unit such as has been discussed relative to FIG. 2 above.

Finally, there are diagrammatically illustrated cutter blades 212 and 214i capable of moving in reciprocal directions as illustrated by arrows 2116 and 21W in order to sever the aforesaid sheets as well as the tear strip 166 connected to the separator wall 160. Thereby in accordance with the invention, there may be formed the embodiment illustrated in FIGS. 1 and 2 above and with minor modifications and changes, the embodiment i1- lustrated in FIGS. A and 5.

From what has been described above, it will now be obvious that the invention provides a method of making a thermal compress comprising sandwiching a wall between two sheets and connecting the sheets to the wall along a closed line to form separate compartments which are respectively charged with thermally reactive substances. An opening is left in each of the compartments so that the compartments can be charged with respective of the chemical substances mentioned above whereafter the openings can then be sealed off. This sealing operation can be effected through the

aforesaid cutters

212 and 214 which may be, for example, coupled to the high-

frequency heating units

202 or 204.

The method of the invention comprises forming the aforesaid wall and sheets of flexible plastic such as polyethylene, vinyl or the like and heat sealing the same along the aforesaid closed line.

Alternatively, the method may comprise forming the separator wall with a rigid frangible part.

According to the preferred embodiment of the invention, a tear strip is sealed to the separator wall on one side of the latter and the opposite extremities of the tear strip is sealed between the separator wall and one of the associated sheets.

The method of the invention furthermore comprises bending the wall and sheet, as well as the tear strip, transversely of the latter and, before the tear strip is sealed between the said wall and said one sheet, at least partly straightening the tear strip to decrease the effective length thereof relative to that of the wall and sheets.

Preferably, the tear strip is sealed to one side of the wall along a V-shaped seam or the like.

As a feature of the invention the method thereof may comprise loading foam plastic elements or pellets into at least one of the compartments to form an insulation layer. Further sheets may be attached to the aforegoing package in order to provide for insulation spaces including air or plastic pellets or alternatively, being evacuated and supplied with an inert gas or the like.

The apparatus of the invention as has been seen comprises sources of three sheets of plastic, guides to guide the same into face-to-face relationship with one of the sheets sandwiched between the other two sheets, sealing devices to seal the sheets together to form two pockets separated by one of the sheets which forms the separator wall, supplies to supply into respective of the pockets substances which when mixed result in a thermal change and a sealing device to seal the pockets closed.

There will now be obvious to those skilled in the art many modifications and variations of the articles of manufacture, methods and apparatus described hereinabove. These modifications and variations will not depart from the scope of the invention if defined by the following claims.

What is claimed is:

ll. A thermal compress comprising an outer container defining an inner space, an inner wall within said container dividing said space into two separate compartments each bounded in part by said outer container, control means physically associated with said wall to provide, on the application of at least one manual force to the container, a passage through said wall at a localized and predictable position, and first and second means respectively located in said compartments and separated by said wall until the formation of said passage, said first and second means upon contacting one another, after the formation of said passage, performing a thermal function.

2. A thermal compress as claimed. in claim 1, wherein said outer container includes two sheets connected along a closed line through the intermediary of said wall.

3. A thermal compress as claimed in claim 2 wherein said sheets and wall are peripherally sealed together.

4. A thermal compress as claimed in claim 2 comprising insulation means loosely accommodated within at least one of said compartments.

5. A thermal compress as claimed in claim 1 wherein said control means includes a tear strip connected to said wall.

6. A thermal compress as claimed in claim 5 wherein said strip is connected to said wall along a V-shaped seal.

7. A thermal compress as claimed in claim 2 wherein said sheets and wall are flexible and said control means is a generally rigid frangible member in said wall.

8. A thermal compress as claimed in claim 2 wherein said sheets and wall are of a plastic of similar guage.

9. A thermal compress as claimed in claim 5 wherein said strip is of a thicker guage than said wall.

10. A thermal compress as claimed in claim 2 comprising a further sheet connected to one of the first said sheets and forming a insulating compartment therewith.

11. A thermal compress as claimed in claim 2 wherein said control means comprises a tear strip sealed at a location between said wall and one of said sheets and being connected to said wall at a position spaced from said location.

12. A thermal compress as claimed in claim 11 wherein said sheets and wall are correspondingly bent for effectively shortening the lengths thereof and wherein said tear strip has a shorter effective length than said sheets and wall so that, upon a straightening of the sheets and wall, the tear sheet tears said passage in said wall at said position.

13. A thermal compress as claimed in claim 12 wherein said one sheet includes an indicator to indicate wherein the tear strip is sealed between said wall and said one sheet.

14. A thermal compress as claimed in claim 12 wherein said tear strip is sealed to said wall at said position along a V-shaped seam symmetrically located along an imaginary line passing through said location.

15. A thermal compress as claimed in claim 12 wherein said tear strip is shorter than said wall.

16. A thermal compress comprising two sheets connected together to form an inner space, a wall in said inner space to divide the latter into two compartments, substances in said compartments adapted on contact to effect a thermal reaction, and a tear strip connected between said sheets and to said wall to enable tearing a passage into the wall to permit said substances to mix.

17. A thermal compress as claimed in claim 16 wherein one of said compartments is spaced from said sheets.

18. A thermal compress as claimed in claim 16 wherein said compartments are respectively bounded by said sheets.

Claims

1. A thermal compress comprising an outer container defining an inner space, an inner wall within said container dividing said space into two separate compartments each bounded in part by said outer container, control means physically associated with said wall to provide, on the application of at least one manual force to the container, a passage through said wall at a localized and predictable position, and first and second means respectively located in said compartments and separated by said wall until the formation of said passage, said first and second means upon contacting one another, after the formation of said passage, performing a thermal function.

2. A thermal compress as claimed in claim 1, wherein said outer container includes two sheets connected along a closed line through the intermediary of said wall.

13. A thermal compress as claimed in claim 12 wherein said one sheet includes an indicator to indicate wherein the tear strip is sealed between said wall and said one sheet. 14. A thermal compress as claimed in claim 12 wherein said tear strip is sealed to said wall at said position along a V-shaped seam symmetrically located along an imaginary line passing through said location.