US2502112A - Indented paper manufacture - Google Patents

Description

Mal ch '28, 1950 c. R. WALKE R INDENTED PAPER MANUFACTURE Filed Dec. 5., 1945 I V EN TOR. C M4131. ES M1; (E45 ATTORNEYS.

Patented Mar. 28, 1950 INDENTED PAPER MANUFACTURE Charles R. Walker, Cincinnati, Ohio, assignor to The Fox Paper Company, Cincinnati, Ohio, a

corporation of Ohio Application December 5, 1945, Serial No. 532,823

The present invention relates to the practice of ,making non-nesting indented paper strips. In the manufacture of indented paper 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 projections 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.

It is important, where padding is being formed from two or more pieces of indented paper that the pattern of indentations do not mesh with each other, as if this takes place the cushioning effect of the indentations is substantially lost. I have found it desirable to avoid so far as possible the practice, in making up padding from a series of webs of indented paper, of rolling the paper webs onto rolls after being indented and then unreeling the paper for the purpose of combinlng it with other webs in making the padding. This is because the making of a neat roll from paper web requires fairly 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 have sharply angled walls of the indentations, is that to obtain a sharp and high indentation on a single sheet of the normal type of paper used in making padding, the indenting rolls must be brought so close together that they tend to rip and tear the paper. This is due in part to the fact that in indenting of paper the material in many patterns of indentation must flow in order to form up, as distinguished from pure corrugation of paper in which the material forming the bends is mainly accumulated from the length of the web being corrugated, thus shortening the over-all length of the corrugated web as compared to the original material.

1 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 8 Claims. (Cl. l54-33.05)

' fashion of a cushion. A difficulty with forming several indented webs in a passage through the same set of indenting rolls is that the pattern is the same and hence the indented webs will mesh, and not form a fully cushioned pad directly from the indenter.

It is an object of the present invention to 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 rolls, 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 things the webs can be 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 in a pad only alternate webs will normally be treated to avoid nesting. I will describe the invention by referring to the making of a three thickness pad since this will explain methods of productions and structures which inelude various thicknesses.

I have illustrated partially diagrammatically in the drawings, an arrangement of apparatus which will accomplish the ends noted.

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 web 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 paper I, 2 and 3, suitable for 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, 6, which engage all three webs of the paper at the same time, thus indenting them.

There is also provided a stand of driven rolls 1 through which the central 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 II and [2, out of the plane of the web. The shape of the tongues is not essential and is subject to choice or convenience. There may be a set of tongues II, 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 i2 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 l3, It, in another stand l5, 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 sufficient 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 this central sheet.

The two outer webs (still marked l and 3) are guided by means of suitable guide rolls so as to pass through the stand 1 above and below the rolls I and above and below the fold back blades I3, M.

The three webs meet between rolls I6 and I1, and at Il may be met with asheet' of wrapping paper l8, which is supplied with adhesive streams by the appliance l9. Rolls l6 and I1 will be guide rolls, normally, rather than feed rolls.

In the drawings the wrapping machine has not been shown except for the feed rolls 20' 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 l.

The tongues on both sides of the central web will fold entirely back and form sufiicient 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 them together with a view to forming unwrapped pads, packing partition pieces, etc. At any rate the feed rolls engage the assembled webs which mitigates crushing of the 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 be wrapped or unwrapped, adhesively joined or stapled or taped together, or simply left as unsecured assemblies. Where five webs are indented 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 I3 will turn all tongues back so as to lie on the surface 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 tongues would lie on the inner faces of the two outerwebs.

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

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

1. The method of forming an indented paper pad including at least three plies, which comprises supplying three continuous webs of paper, passing said webs together between a pair of driven indenting rolls, separating the two outer webs and passing the central web through a device for punching out and laying back tongues on both sides of the said central web, causing the separated webs to pass under and over the said device, and then bringing the webs together to form a three ply padding whereby the tongues act as spacers to prevent nesting.

2. The method of forming an indented paper pad having at least three plies, which comprises supplying three continuous webs of paper, passing said webs together between a pair of driven indenting rolls, separating the two outer webs and passing the central web through a device for punching out and laying back tongues on both sides of the said central web, causing the separated webs to pass under and over the said device, and then bringing the webs together to form a three ply padding, whereby the tongues act as spacers to prevent nesting; and, after the webs are assembled, feeding them along with drive rolls.

3. The method according to claim 1 in which the tongues are in rows in directions across and lengthwise of the said central web, and which includes the steps of alternately laying back tongues on opposite faces of the said central web in the rows extending in one of the named directions, at least.

4. The method of forming an indented paper pad with at least three plies, which comprises supplying three webs of paper, causing the webs to pass together through a pair of driven indenting rolls, separating the two outer webs, acting on the central web to first punch out and then lay back on the faces of the web a series of tongues alternating on both faces of the web, then bringing the webs together whereby nesting will be prevented by means of the tongues, feeding the outer webs followin indenting, and the central web following punching out the tongues, by means of feed applied to the assembled webs.

5. That method of forming a non-nesting pad of indented paper which consists in passing a plurality of webs of indentable paper together between a pair of indenting rolls, separating the webs continuously, and continuously passing at least one of the webs through the step of cutting tongues therein laying them backwardly of the path of travel of the web, said tongues lying on the crests of the indentations and forming a supporting element preventing nesting of the indentations.

6. The method of claim 5 in which the webs are two in number, and the tongues are laid back on one side of .the selected web. I

'7. The method of claim 5 in which the webs are more than two and the tongues are laid back on sides which will be in contact with the meeting faces of webs not having tongues to act as spacers when said webs are assembled into pad form.

8. The method of claim 5 in which the feed for drawing the webs from the indenting rolls and 15 through the tongue forming and folding instrug 6 mentalities is applied to the webs when re-as- Number Name Date sembled together into pad form. 1,796,541 Schoo Mar. 17, 1931 CHARLES R. WALKER. 1,927,791 13 11;: Sept. 19, 1933 1,943,145 R1' 1egenberg Jan. 9, 1934 REFERENCES CITED 5 1,971,780 'Gzjaham et a1. Aug. 23, 1934 1,939,794 Du jan 'Feb. 5, 1935 2 memes are record 2,036,051 K1 1 11111 Mar. 31, 1936 2,106,246 Fourness Jan. 25, 1938 UNITED STATES PATENTS 2,110,732 wjeber Mar. 8, 193a Number Name a FOREIGN PATENTS 201,929 Macdonald Apr. 2, 1373 493,929 Holcomb Mar. 21, 1393 Number Country Date 1,542,427 Warden June 16, 1925 85,613 Germany 21, 1896

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