WO2004041447A1

WO2004041447A1 - Hot melt adhesive agent spray-coating method and coating nozzle device of hot melt adhesive agent spray-coating device

Info

Publication number: WO2004041447A1
Application number: PCT/JP2003/014040
Authority: WO
Inventors: Shoji Hidaka; Seiki Tarumi; Eiji Yamazumi
Original assignee: Sun Tool Corporation
Priority date: 2002-11-06
Filing date: 2003-10-31
Publication date: 2004-05-21
Also published as: AU2003301805A1; WO2004041447B1; JP2004154665A

Abstract

A hot melt adhesive agent spray-coating method, comprising the steps of forming a large number of hot melt adhesive agent holes of a square shape in cross section parallel with each other in the transverse direction of a coating line, forming a large number of pressurized air holes on the front and rear sides of the hot melt adhesive agent holes with the center parts of the openings thereof positioned adjacent to each other to form the large number of pressurized air holes on the front and rear sides of the large number of hot melt adhesive agent holes in the transverse direction of the coating line, allowing slit air flows formed in the pressurized air jetted from the nozzle bottom face openings of the pressurized air holes to act on the front and rear sides of a hot melt adhesive agent beat of a square shape in cross section, and lowering the hot melt adhesive agent beat with the hot melt adhesive agent beat held by the pair of front and rear slit air flows in a sandwiched state.

Description

Specification

Title of invention

Hot melt adhesive spray application method and application nozzle device of hot melt adhesive spray application device

The present invention relates to a product having a thin adhesive-coated surface or a bonding surface requiring air permeability by applying a hot-melt adhesive to a base material on the upper surface of a coating line (for example, a product for absorbing body fluid). The present invention relates to a hot melt adhesive spray application apparatus and a hot melt adhesive spray application method for enabling production of a soft and mild bonded product. Background art

With respect to the hot melt adhesive spray coating device, Japanese Patent Application Laid-Open No. Hei 5-309310 (Japanese Patent Application No. 4-163308) filed by the applicant of the present application discloses a "hot melt adhesive coating device". The published patent application discloses that a large number of coating nozzle holes are arranged in the transport crossing direction of a coating line to form a coating nozzle hole group, and that the coating nozzle holes are formed in front of and behind the coating nozzle hole group in close proximity to the coating nozzle hole group. By supplying pressurized air and applying a pressurized air flow to both the front and rear sides of a large number of hot melt adhesive beads discharged from a large number of application nozzle holes, a hot melt M is deposited on the base material as a thin film of curtain fiber shape. The agent is applied by spraying.

In the force-fiber single-fiber spray coating apparatus of the above-mentioned known document, the amount of hot-melt adhesive used is significantly reduced as compared with a conventional spiral spray coating apparatus by obtaining a thin and uniform coating surface, and Although it has the effect of obtaining a strong adhesive surface, there is a slight gap between the hot melt adhesive hole group and the pressurized air holes located before and after it on the bottom surface of the coating nozzle device, Hot-melt adhesive force discharged from hot-melt adhesive hole <Pressure in a state of hot-melt adhesive bit, that is, at a position slightly away from the hot-melt adhesive hole opening on the bottom surface of the application nozzle device By causing the pressurized air from the air holes to act on the hot melt adhesive beat, the amount of pressurized air used increases. Adhesion of hot-melt adhesive near the melt adhesive hole causes problems such as shutdown of maintenance work as a countermeasure and excessive consumption of air energy. Therefore, the present invention is not a pressurized air hole. Another object of the present invention is to provide a hot-melt adhesive surface having a strong adhesive force by reducing the supply amount of pressurized air and using a smaller amount of hot-melt adhesive. Disclosure of the invention

The invention of claim 1 of the present application is characterized in that the hot-melt adhesive is discharged from the nozzle bottom opening of a number of hot-melt adhesive holes having square cross-sections having rectangular cross-sections, and the hot-melt adhesive having a rectangular cross-section in the application line traveling direction. Pressurized air discharged from the nozzle bottom opening of the pressurized air hole, which forms a beat and is located in front of and behind each of the multiple hot melt adhesive holes and has an inclined direction that is at an acute angle to the hot melt adhesive hole A slit melter is formed to act on the slit melter before and after the hot melt adhesive beat having a square cross section. A hot melt adhesive spray coating method characterized by lowering a hot melt adhesive beet in a state of sandwiching iron into a sandwich.

The invention of claim 2 of the present application is the hot melt adhesive spray coating method according to the invention of claim 1, characterized in that laterally undulating thread-like fibers that do not cross each other are generated on the base material surface of the application line. I will provide a.

The invention of claim 3 of the present application is to form a large number of hot-melt adhesive holes in the form of square holes having a rectangular cross section in parallel with the application line transverse direction, and in the application line transverse direction adjacent to each hot-melt N¾ adhesive hole, A large number of pressurized air holes are formed on the front and rear sides of the hot-melt adhesive hole at the front end and the rear end of the hot-melt adhesive hole opening so that the center of the opening is approximately adjacent to the hot-melt adhesive hole. Provided is an application nozzle device for a hot melt adhesive spray application device, characterized in that a number of pressurized air holes are formed in front and rear sides of an adhesive hole in a direction transverse to an application line.

The invention of claim 6 of the present application is, in addition to the invention of claim 3, in addition to hot melt adhesive bonding of the pressurized air hole to the hot melt adhesive hole in the vertical direction in the vertical section in the application line traveling direction of the application nozzle device. Provided is an application nozzle device for a hot melt adhesive spray application device, wherein the application nozzle device is located in front of and behind a dispensing hole and has an acute angle of inclination.

Next, an embodiment of the present invention will be described.

The invention of claim 1 of the present application is: (1) discharging from the nozzle bottom opening to form a hot melt adhesive beat having a rectangular cross section in the application line advancing direction, and (2) applying pressurized air discharged from the nozzle bottom opening of the pressurized air hole. A slit melter is formed and the slit melter is connected to a hot melt having a square cross section. The hot melt N is applied before and after the adhesive bit, and the hot melt N is dropped by a pair of slit layers at the center of each hot melt adhesive beat. An application surface is formed on the upper surface by using the horizontal run-out fiber.

The invention of claim 3 of the present application is such that the bottom opening of the hot melt adhesive hole 2 on the bottom surface of the nozzle and the bottom opening of the pressurized air hole 5 are adjacent to each other, and the bottom opening of the hot melt adhesive hole 2 is rectangular in the coating line direction. The pressurized air hole 5 has a slit shape that is thinner than the width of the hot-melt adhesive hole 2 and is long in the longitudinal direction. Then, a pair of front and rear slit rollers facing down the hot melt adhesive bead flowing down from the nozzle bottom surface is formed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an exploded perspective view of an application nozzle device of a hot melt adhesive spray application device showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a bottom view.

FIG. 4 shows a shim plate for forming a hot-melt-adhesive-hole group, FIG. 4A is a perspective view, and FIG. 4B is a sectional view taken along line S1-S1 in FIG.

FIG. 5 shows a shim plate for forming a group of pressurized air holes. FIG. 5A is a perspective view, and FIG. 5B is a cross-sectional view taken along line S2-S2 in FIG.

FIG. 6 is a front view showing the outline of the hot melt adhesive spray application device.

FIG. 7 is a plan view showing an outline of a coating line.

FIG. 8 is an explanatory view of the action of the slit layer on the hot melt adhesive bit under the bottom surface of the application nozzle device according to the present invention.

FIG. 9 is a partially enlarged explanatory view of the operation explanatory view of FIG.

FIG. 10 is an explanatory diagram of the twisting action of the hot melt adhesive beat in the interference section Q. FIG. 11 is an explanatory view of the horizontal run-out action of the hot melt adhesive beat in the present invention, wherein FIG. 11A is shown in the transverse direction of the application line, and FIG. 11B is shown in a longitudinal sectional state of the application nozzle device.

FIG. 12 is an explanatory view showing a torsion change of the hot melt adhesive beat as seen in a cross-sectional view of FIG. 11 at the ABCDE point in FIG.

FIG. 13 is a plan view showing an application pattern of the hot melt adhesive on the application line using the filamentous fibers. In the figure, a shows the application surface of the single-strand filamentary fiber which is alternately bent in a V-shape, and b shows the application surface of the single-strand filamentary fiber which is alternately bent in a U-shaped or semicircular shape.

FIG. 14 shows a shim plate of an embodiment different from that of FIG. 4, wherein FIG. 14A is a perspective view and FIG. 14B is a sectional view taken along line S3-S3 of FIG.

FIG. 15 is a bottom view of the application nozzle device similar to FIG. 3 using the shim plate of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings.

6 and 7, the hot melt adhesive hole group 2A of the gun unit 21 is inserted in a direction intersecting with the conveying direction of the transfer line 20, that is, the transfer line 20. The gun unit 21 is placed in the transverse direction of the above, facing the base material 22 on the transfer line 20, and is installed at an appropriate distance from the base material 22. The gun unit 21 includes a coating nozzle device (nozzle chip) 1, a gun base 23, and a hot melt supply control valve 24, and is provided with a hot melt adhesive supply source 25 and a pressurized air supply source 26. are doing.

An embodiment of a coating nozzle device (nozzle chip) 1 which is a main part of the present invention will be described with reference to FIG. 1 to FIG.

The application nozzle device 1 is configured such that the vertical surfaces of a pair of nozzle blocks 10 are opposed to each other, and a coating nozzle hole 2 is formed by the skewer groove 12 with a shim plate 11 having a skewer groove 12 interposed therebetween. Thus, a hot melt adhesive hole group 2A is formed between the pair of lip blocks 1 # and 10. An adhesive supply hole 3 and an adhesive port 4 are formed in one nozzle block 10.

The nozzle blocks 13 and 13 are connected to the front and rear sides of the nozzle blocks 10 and 10, respectively. Clear the inclined surface 10a of the triangular nose block 10 or the inclined surface 13a of the block 13 (Fig. 1), or replace the shim plate 14 with a groove at the bottom with the inclined surface 10a. Pressurized air holes 5 are formed by being interposed between the inclined surfaces 13a (FIG. 2). The pressurized air holes 5 can form a pressurized air hole group 5A as an aggregate of a large number of holes by using the shim plate 14A shown in FIG. 5, similarly to the shim plate 11 shown in FIG. A pressurized air passage 6 communicating with the pressurized air hole 5 is formed in the main blocks 13 and 13 in a horizontal direction. A compressed air supply port 8 is provided. The hot-melt adhesive hole 2 is a rectangular hole having a rectangular cross section in the direction of application of the application line when viewed from the bottom and having a square cross section. Referring to FIG. 3 and FIG. 4, the hot melt adhesive hole 2 has a width smaller than the thickness of the shim plate 11 so as to have a rectangular shape in the application line traveling direction when viewed from the bottom. Referring to FIGS. 3 and 4, the pressurized air hole 5 has a larger width and a smaller thickness than the hot melt adhesive hole 2. That is, the thickness of the shim plate 14 is made smaller than that of the shim plate 11, and the width of the slit (the width of the pressurized air hole 5) is made larger than that of the skewer groove 12 of the shim plate 11. I do.

Referring to FIG. 2, hot-melt adhesive hole 2 is vertical, and pressurized air hole 5 is located in front of and behind hot-melt adhesive hole 2 and has an acute angle to hot-melt adhesive hole 2. Is the inclination direction. Referring to FIG. 3, the adhesive hole and the pressurized air opening are connected at the bottom of the nozzle, but a mask shim plate is provided between the shim plates 11 and 14. The object of the present invention can be achieved even if the adhesive hole opening and the pressurized air opening are not connected to each other with a slight space therebetween by interposing.

Next, the hot melt adhesive spray coating method according to the present invention will be described.

Referring to FIG.

① A large number of hot-melt M holes are located in front of and behind each of the adhesive holes, and the compressed air discharged from the nozzle bottom opening of the pressurized air hole 5 in the inclined direction that is at an acute angle to the hot-melt adhesive hole. A slitter K1 is formed (see (1) in FIG. 8).

② Hot-melt adhesive A number of hot-melt adhesive holes 2 with rectangular cross-sections in the direction of application line travel in the direction of the application line. The hot melt adhesive (ie, hot melt adhesive beet) H1 is allowed to flow downward from the bottom of the nozzle (see (1) in FIG. 8).

(3) A slit roller (K1), which is inclined at an angle (銳) with respect to the hot melt adhesive hole, acts before and after the hot melt adhesive bee HH1 having a square cross section (see (3) in Figure 8).

Referring to FIG. 9,

A slit interference part Q is formed by applying a slit shear force K1 before and after the hot melt adhesive bee KH1 having a square cross section. At the interference section Q, the hot melt adhesive bead HH1 descends while being sandwiched by a pair of slit layers around the hot melt adhesive beat, and the hot melt adhesive beet H1 moves forward and backward. The hot melt adhesive bee HH2 is twisted approximately 90 degrees by the action of the pair of slit rollers K1 (see FIG. 10), and is twisted approximately 90 degrees in a rectangular direction across the application line. Furthermore, it is stretched by the action of the descending slitter K1 As a result, one filament H3 of hot-melt adhesive is formed, and one filament H3 of hot-melt adhesive descends toward the application line.

The filament H3 of one hot-melt adhesive descending is in the vertical direction (coating line advancing direction) at the interference portion Q near the nozzle bottom as shown in FIGS. 11 and 12. The deflection direction changes from diagonal to horizontal deflection.

As shown in Fig. 13, the state of landing on the base material on the application line (application state on the base material) is a horizontal run-out state due to one filament H4 of hot melt adhesive, and the adjacent coating pattern is This results in a horizontal run-off fiber H4 that does not interfere with each other. FIG. 13 (a) shows an application surface of a single-strand, thread-like fiber that alternately bends right and left in a V-shape. FIG. 13 (b) shows the application surface of a single-strand, thread-like fiber that is bent alternately in a left-right U-shape or semi-circle shape.

About the twisting action of the hot melt adhesive bead # 1 shown in FIG.

As shown in FIG. 14, when the hot melt adhesive hole 2 is changed from the pressurized air hole 5 to the orthogonal direction of FIG. Can be regulated.

In (a) of Fig. 15, the adjacent thread-like fibers H4 oscillate at the same timing in the pattern shown in Fig. 13, causing the adjacent thread-like fibers H4 to interfere with each other. The coating density can be increased.

In FIG. 15 (b), the adjacent hot-melt adhesive holes 2 are inclined in opposite directions so that the adjacent left and right thread-like fibers H4 force (by swaying in opposite directions). However, if the hot melt adhesive 2 is arranged in the honey, the adjacent filament fibers H4 will interfere with each other. The cross wavy thread fibers H4 on the base material surface intersect with the adjacent cross wavy thread fibers H4, so that the overlapping portion force << is generated and the net shape is formed, thereby increasing the strength of the application surface.

The lateral swing repeats violently and regularly, and the amplitude number changes according to the pressure of the air. The pressure of air can be as small as 0.1 to 0.5 kgf / cm2.

There is no overlap between the filaments of the hot-melt adhesive on the coating surface due to the crossing points of the filaments. When applied to the manufacture of a bodily fluid absorbing product, a soft bonding surface can be formed, and a soft and soft bodily fluid absorbing product can be obtained.

By changing the width of the slit layer K1, the run-out width of the filamentous fiber H4 can be changed. The width of the slit layer K1 can be simplified by replacing the pressurized air effect shim plate (see Fig. 5) with a different slit width. W 200 You can simply choose. 7 The fan-shaped flight range before landing diverges in a fan-like shape at a distance of 10mm to 30mm from the nozzle in the flight direction, so that the applicable coating width can be easily selected by adjusting the nozzle height. By controlling the pressure in conjunction with the speed of the coating material, the amplitude of the pitch changes. Therefore, it is also possible to perform a follow-up operation in response to a change in the speed of the coating line.

The application amount is 4 to 30 g / min per nozzle.

ADVANTAGE OF THE INVENTION This invention can reduce the supply amount of pressurized air from a pressurized air hole, and can obtain the hot-melt bonding surface which has strong adhesive force with a smaller amount of hot-melt adhesive used.

Also, in the present invention, since the pressurized air hole opening is adjacent to the front side and the rear side of the hot melt adhesive hole opening, the cleaning action of the hot melt adhesive hole opening by the pressurized air causes the bottom surface of the nozzle tip to adhere to the bottom surface. Eliminating the need for removing and cleaning the adhering matter and eliminating the removal and cleaning work after the operation is stopped enables long-term continuous operation and has the effect of reducing coating costs.

The coated surface has good air permeability. <Because it is flexible, it can be used as a body fluid absorbing product. <Applied to the production of products where the adhesive coated surface comes in contact with the skin. It has a possible effect. Industrial applicability

By applying the present invention to a product in which the adhesive-coated surface comes into contact with the skin, such as a product for absorbing body fluid, it is possible to provide a product with a good touch and a high commercial value. Ommut, Nafkin, etc.).

Claims

The scope of the claims

1.

A large number of hot melt adhesive holes are arranged in the transverse direction of the application line to form a hot melt adhesive hole group, and pressurized air holes are arranged before and after the hot melt adhesive hole group to form a hot melt adhesive hole group. In the hot melt adhesive spray coating method of spraying the hot melt adhesive by applying the pressurized air from the pressurized air hole to the hot melt adhesive,

① The hot melt adhesive is discharged from the nozzle bottom opening of a number of hot melt adhesive holes with square cross-section square holes to form a hot melt adhesive beat with a rectangular cross section in the application line traveling direction,

(2) A slit layer is formed by pressurized air discharged from the nozzle bottom opening of the pressurized air holes located in front and rear of each of the multiple hot melt adhesive holes, and the slit layer is bonded to the hot melt having the square cross section. Act before and after the drug beat,

③ Lower the hot melt adhesive beater into a sandwich with scissors using a pair of slit layers around the hot melt adhesive beat.

A hot melt adhesive spray application method.

2.

A large number of hot melt adhesive holes are arranged in the transverse direction of the application line to form a hot melt adhesive hole group, and pressurized air holes are arranged before and after the hot melt adhesive hole group to form a hot melt adhesive hole group. In the hot melt adhesive spray coating method of applying hot air from the pressurized air hole to the hot melt adhesive and spraying the hot melt adhesive,

① Hot-melt adhesive is discharged from the nozzle bottom opening of a number of hot-melt adhesive holes with square cross-section square holes to form a hot-melt adhesive beat with a rectangular cross section in the application line traveling direction.

(2) A slitter is formed by pressurized air discharged from the nozzle bottom opening of the pressurized air holes located in front and rear of each of the plurality of hot melt adhesive holes, and the slit layer is formed into a hot melt adhesive beat having a square cross section. Act before and after

③ The hot melt adhesive beat is lowered with a pair of front and rear slit layers around the hot melt adhesive beat while sandwiching the hot melt adhesive beat into scissors.

横 On the base material surface of the application line, generate side-running thread-like fibers that do not cross each other A hot-melt adhesive spray coating method, characterized in that:

3.

A large number of hot melt adhesive holes are arranged in the transverse direction of the application line to form a hot melt adhesive hole group, and pressurized air holes are arranged before and after the hot melt adhesive hole group to form a hot melt adhesive hole group. The hot melt adhesive is applied to the hot melt adhesive by applying the pressurized air from the pressurized air hole to spray the hot melt adhesive. Are formed in a large number in the transverse direction of the application line,

Adjacent to each hot-melt adhesive hole, across the application line, forward and rearward of the hot-melt adhesive hole, adjacent to the front and rear ends of the hot-curet adhesive hole opening, and approximately at the center of the opening To form a number of pressurized air holes,

A large number of pressurized air holes are formed on the front and rear sides of a number of hot melt adhesive holes, respectively, in parallel with the application line transverse direction.

An application nozzle device for a hot melt adhesive spray application device, characterized by:

Four.

The hot-melt adhesive hole is a rectangular cross-section square hole in the application line advancing direction when viewed from the bottom of the nozzle, and the front end and the rear end of the hot-melt adhesive hole are formed by the pressurized air formed in the transverse direction of the application line. Adjacent to the hole,

4. The application nozzle device of the hot melt adhesive spray application device according to claim 3, wherein the hot melt adhesive hole is in a direction orthogonal to the pressurized air hole when viewed from the bottom of the nozzle.

Five.

The hot-melt adhesive hole is a rectangular hole having a rectangular cross-section that is inclined with respect to the application line advancing direction when viewed from the bottom of the nozzle, and the front end and the rear end of the hot-melt adhesive hole are formed in the transverse direction of the application line. Adjacent to the pressurized air hole,

4. The coating nozzle device of the hot melt adhesive spray coating device according to claim 3, wherein the hot melt adhesive hole is in a direction perpendicular to the pressurized air hole and in an inclined direction when viewed from the bottom of the nozzle. .

6. A large number of hot melt adhesive holes are arranged in the transverse direction of the application line to form a hot melt adhesive hole group, and pressurized air holes are arranged before and after the hot melt adhesive hole group to form a hot melt adhesive hole group. The hot-melt adhesive is spray-coated by applying the pressurized air from the pressurized air hole to the hot-melt adhesive. Are formed in parallel in the transverse direction of the application line,

Adjacent to each hot-melt adhesive hole, across the application line, at the front and back of the hot-melt adhesive hole, at the front and rear ends of the hot-melt adhesive hole opening Adjacent to form a number of pressurized air holes,

On the front side and on the rear side of the hot melt adhesive holes, a large number of pressurized air holes are formed in parallel with the transverse direction of the application line, respectively:

In the longitudinal section of the application nozzle device in the application line traveling direction, the pressurized air holes are positioned at the front and rear of the hot melt adhesive element L with respect to the vertical hot melt adhesive holes and at an acute angle.