US2502113A - Indented paper pad - Google Patents

Description

C. R. WALKER INDENTED PAPER PAD March 28, 1950 Original Filed Dec. 5, 1945 INVENTOR. CHm LEs fl/nixsi v ATTORNEYS- Patented Mar. 28, 1950 INDENTED PAPER PAD Charles R. Walker, Cincinnati, Ohio, assignorto The-Fox Paper Company, Cincinnati, Ohio, a

corporation of. Ohio Original application December 5, 1945, SerialNo.

Divided and this application. March 5, 19417, SerialNo. 732,399

4.Claims. 11

The present invention relates to. pads orassemblies formed: from. indented paper strips. so arranged thattheplies do .not nest. In-the manufacture of indentedpaper. a sheet of paper board or heavy paper; is. passed between. a. pair of. rolls which. have patterned surfaces which interengage to form a; large number of relatively small proiections and indentations. on. the sheet. In one practice, paper; webs, formed and dried. are moistened. with. a. steam from. a jet applied to the webs shortly before. passing. between the rolls, and the rolls heated to set the indentation. This application. is a division. of. my application Serial. No..632,823 filed. December 5, i945,

in the. United. States Patent Office.

It. isimportant. where padding. is being formed from twoor. more pieces. of. indented. paper that the pattern of. indentations. do not mesh with each other, asit this. takes place the cushioning effect of the indentations is substantially lost. One of the advantagesrof. mynew. pad is that in making up the padding. from: a. series of webs or indentedpa-per, I. can avoid rolling the paper webs onto rolls after being. indented and then Lllll61il1g' the paper for the purpose oft combining it. with other webs in. making the padding. This is because. the making. of a neat roll from paper web requiresfairly tight. coiling and this results in crushing down. the indentations, particularly as freshly indented.

A peculiarity which. has been noted. in the practice of forming indented paper, particularly with patterns which. havesharply angled walls of the indentations, is that. to. obtain. a. sharp and high. indentation on a single sheet, of. the normal type of paper usedin makingpadding, the indenting rolls must be brought so close together that they tendv to rip. and; tear the paper. This is due in part to the fact that in indenting of paper the material-immany patterns of indentation must flow in order to form up, as distinguished" from pure corrugation of'paper in which the material forming the bonds is mainly accumulated. from thelength: of. the" web being corrugated. thus, shortening the over-all length of the corrugated web as compared to the original material.

When, however; more than one web of, paper is passed through indenting rolls at the same time, the indentation pattern forming projections on the rolls do not tend to tear and split the paper probably because the adjustment of the rolls together is not so close and because the several webs protect each other after the fashion of a cushion. A difiiculty with forming subject to choice or convenience.

several indented webs in a passage through the same set of indenting rolls isthat the pattern is the same and hence the indented webs will mesh, and notiorm a fully cushioned pad directly from the indenter.

One of theadvantages of my novel padding is that I may form multiple thickness padding of indented paper by a practice in which all webs are indented by a. passage together through a single set of indenting r011s,.and in which certain of the webs are further treated continuously to avoid nesting- In this way the reeling of an already indented web is not required, and among other thingsthe webs canbe furnished continuously to a wrapping machine which wraps the,

set of webs into a continuous pad which can be cut into lengths as desired. Where more than two layers are to be combined ina. pad only alternate webs will normally be treated toavoid nesting. I will describe the practice of. making my padding by referring to the making of a three thickness. padv since i this will explain methods of productions and structures which include various thicknesses.

I have illustrated. partially. diagrammatically in the drawings, an. arrangement of apparatus which will accomplishtheendsnoted, although it should be particularly noted. that the product may be made in other ways either. in whole or in part.

In the drawings:

Figure 1 is a partially diagrammatic side elevation of a mechanical. arrangement for carrying out my practice.

Figure 2 is a plan View of the central webs. in several stages. of treatment.

Figure 3 is a. large View of a portion. of the central web as completed before combining with the two outer webs to form a pad.

The illustrated, practice is supplied with three rolls of paperv I, 2 and 3, suitablefor indenting. The webs are drawn past steam. jets 4, and into the indenting machine 5.. This machine is equipped with. a Pair of driven indenting rolls 6, 5, which engage all three webs of the paper at g the same time, thus indenting them.

There is also provided av stand of driven rolls 1 through which thecentral web (still marked 2,) is caused to pass. These rolls are provided with alternate teeth 8 and pockets 9 which mesh with each other and are so conformed as to cut V- shaped, or they may be U or other shaped patterns Ill, in the web and push the liberated tongues I! and i2, out of the plane of the web. The shape of the tongues is not essential and is There may be a set of tongues H, in the web followed by a set of tongues l2, and since the rolls are so cut, the tongues Ii will project somewhat from the top surface of the web and the tongues IE will project slightly from the bottom surface of the web. Also, by a suitable cutting of the tongue forming rolls alternate tongues in the transverse rows may be so struck as to project alternately at the top and bottom of the Webs. Other patterns may, of course, be used.

The web then passes between a pair of blades it, i l, in another stand I5, which blades engage the projecting tongues at each side of the web and fold them back against the web. This folding back need only be sufiicient for the angles of the tongues to be lagging with respect to the direction of feed of the web, and the particular top and bottom projection of the tongues will regulate which ones are laid back on the top and which are laid back on the bottom of thi central sheet.

The two outer webs (still marked l and 3) are guided by means of suitableguide rolls so as to pass through the stand above and below the rolls land above and below the fold back blades 1 i, it.

The three webs meet between rolls i6 and H,

and at H may be met with a sheet of wrapping paper it, which is supplied with adhesive streams by the appliance i Q. Rolls l6 and H will be guide rolls, normally, rather than feed rolls. In the drawings the wrapping machine has not been shown except for the feed rolls 2!! which draw the assembled wrapped webs through the wrapping apparatus and incidentally draw the three webs forming the filling of the pad from the driven rolls 6 and ,1.

The tongues on both sides of the central web will fold entirely back and form sufficient layer to keep the otherwise nestable sheets from nesting together, as the assembly of layers is completed.

,Instead of drawing the webs along from the feed rolls of a wrapping machine, a cementing machine could be used in which case silicate or some other adhesive would be imposed on the several webs and the operation will be to cement th m together with a view to forming unwrapped pads, packing partition pieces, etc. At any rate the feed rolls engage the assembled webs which mitigate crushing ofthe fresh indentations in whatever device is used to form assemblies of the three webs. There may be additional webs on the outside of the three web assembly, or other sandwiches of non-nesting type secured together with the three layer assembly, which may ice-wrapped or unwrapped, adhesively joined or stapled or taped together, or simply left as unsecured assemblies. Where five web-s are intongues would lie on the inner faces of the two outer webs.

I have been able to indent up to six webs at a time in a pair of indenting rolls. The difficulty lies in separating the webs after indenting. The tongue treatment can be adapted in various Ways as will be evident without further comment.

To make a product such as I have described, it is not necessary that conjoint indenting be followed along with the tongue slitting and folding operation. Also similarly indented webs made separately and supplied to the pad forming machine from rolls may be used, which would result in eliminating the common indenting step of the mechanism described. Also the product could be formed from rolls of paper by using separate indenting rolls for any or all of the webs of paper, operated in proper timing with the tongue forming apparatus.

The present application covers the product of my invention irrespective of its mode of manufacture. Among other things it will enable the maker of indented paper to use up supplies intended for other purposes into desirable pads, when it happen that all have the same indentation. Furthermore the turning of tongues as in my pads, may be of advantage in adding to the thickness of pads formed of paper of non-nesting indentation in the several plies.

Having thus described the invention, what is claimed as new and is desired to be covered by Letters Patent is:

l. A cushioning paper pad comprising a plurality of layers of identically indented paper webs, and tongues cut in at least one of the webs, and folded to overlie the indentations thereof, thus serving as a spacer to prevent nesting.

2. A cushioning paper pad comprising at least three layers of identically indented paper, at

dented together then the second and fourth webs may be formed-with the tongues. Where but two webs are used, which is not preferred, the tongues to prevent nesting will best be cut in one of the webs only. the tongue cutting roll being arranged to deflect the tongues alike and a single blade l3 will turn all tongues back so as to lie on the sur face of the web which meets the other web. In the three web form such a treatment could be given to the two outer webs in which case the least one intervening layer having tongues which are cut therein and folded to position to lie some over the indentations on one face of said middle layer and some over the indentations on the other face of the middle layer, for the purpose described.

3. A cushioning paper pad comprising a plurality of layers of indented paper, and tongues cut in at least one of the webs and folded to overlie the indentations thereof, thus serving as a spacer. I

4. A cushioning paper pad comprising at least three layers of indented paper, at least one intervening layer having tongues which are cut therein and folded to position to lie some over the indentations On one face of said middle layer and some over the indentations on the other face of the middle layer, for the purpose described.

1 CHARLES R. WALKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 201,929 Macdonald Apr. 2, 1878 1,542,427 Wardell June 16, 1925 1,989,794 Duvall Feb. 5, 1935

Images