US2429539A - Paper treating method - Google Patents

Description

Get. 21, 1947. F.'P. WOOD PAPER TREATING METHOD Filed May 26, 1945 3 sheeas Sheec l F. P. WOOD PAPER TREATING METHOD Oct. 21, 1947.

3 Sheets-Sheet 2 Filed May 26, 1945 Oct. 21, 1947. F. P. WOOD PAPER TREATING METHOD Fil ed May 26, 1945 5 Sheets-Sheet 5.

believed to have been worked out.

Patented Oct. 21, 1947 PAPER TREATING METHOD v Frederick P. Wood, Adrian, Mich., assignor to Simplex Paper Corporation, Adrian, Mich., a

corporation of Michigan Application May 26, 1945, Serial No. 595,975

For various purposes it is sometimes desirable to have paper which will stretch in both directions. Crepe paper is very satisfactor where stretching in only one direction is sufiicient. For

some purposes it proves not very satisfactory as,

for example, when it is desired to wrap articles of irregular shape. Unless a very good grade of paper is used, it is quite likely to tear.

It has previously been proposed to corrugate creped paper so as to make it stretchable in both directions, but no really satisfactory product is According to the present invention, a web of creped paper is carried partly around a drum which is provided with inclined circumferential grooves into which the paper is pressed. Due to the inclination of the grooves, the resultin plaits are easily rolled flat. Special means are provided for pressing the paper into successive grooves, for holding it in some grooves while it is being pressed into other grooves, and for stripping the paper from the grooves.

Of course, the same apparatus could be used for plaiting smooth paper if that should be desired.

Additional objects and advantages of the invention will become apparent from the following description and from the drawings; in which,

Figure 1 is a plan view of the form of the invention chosen for illustration;

Fig. 2 is a vertical, sectional view taken approximately on the line 2--2 of Fig. 1;

Fig. 3 is a fragmentary, transverse, sectional View taken approximately on the line 33 of Fig. 2;

Fig. 4 is a corresponding view taken approximately on the line 44 of Fig. 2;

Fig. 5 is a transverse, cross-sectional view of the completed web, taken on the line 55 of Fig. 2; and

Fig. 6 is a fragmentary plan view showing a modified form of the invention.

None of the figures is drawn accurately to scale, and no attempt has been made to show the creped nature of the paper. The general proportions of the apparatus, however, are believed to be appropriately shown.

Although the law requires a full and exact description of at least one form of the invention, such as that which follows, it is, of course, the purpose of a patent to cover each new inventive concept therein no matter how it may later be disguised by variations in form or additions of further improvements, or combinations in which the inventive concepts are found.

1 Claim. (Cl. 154-33.05)

In the illustrated form of the invention, the creped .paper web ll passes under a shield 12 and. around a corrugating drum l3 and then between pressure rolls I4 which flatten down the corrugations or plaits formed formed therein by the drum 13 and cooperatin parts.

The drum 13 has a plurality of circumferential grooves 116 formed therein. As best seen in Figs. 3 and 4, these grooves preferably are inclined, those on each side of the center being inclined downwardly toward the center' of the drums length.

, In order to press the paper into the grooves 16, a plurality of pairs of rollers H are provided. The first pair of rollers I1 is seen in Fig. 3. It will be observed that these rollers, as is the case with all the other rollers H, are inclined to correspond to the inclination of the grooves IS. The rollers I! which cooperate with the two grooves I6 nearest the middle of the drums length are the first rollers which the paper reaches. 7

According to the usual practice in corrugating machines, successive pairs of rollers are spaced at intervals-along the path of the paper. This is necessary because each roller draws the paper inwardly from the sides, and the part of the paper outwardly from the point of the draw must be free to be drawn in.

After the first pair of rollers has pressed the paper into the central pair of grooves, it is necessary to hold the paper in these grooves while the next pair of rollers presses the paper into the next pair of grooves, as otherwise this second pair of rollers would pull the paper partly out of the first pair of grooves. According to the present invention, the paper which has been pressed into any of the grooves I6 is held therein by one of the endless bands l8. Entering the groove, each band 18 passes around a forward pulley l9. In leaving the groove, each band passes around a rear pulley 20. One or more guide pulleys or rollers 22 may be provided to stretch the bands tight and hold the return runs out of contact with the drum. Individual pulleys may be suitably mounted for tightening the various bands l8 if found necessary. The pulleys I9 and 20, as illustrated in Figure 2 of the drawings, extend into the inclined grooves E6 to within a short distance of the bottoms of said grooves and said pulleys I9 and 20 must necessarily be set at an angle or inclination when so positioned.

In order to strip the web from the drum l3, it is preferred to provide another set of endless bands 26 which extend around the drum l3. one

3 in the bottom of each groove l6. At the strip-off point the bands 26 leave the drum I3 to pass around pulleys 21. As they leave the grooves, they pull the paper out of the grooves and thus strip it from the drum I3.

As the paper passes between rolls I4, the plaits or corrugations, which were pressed into the grooves l6, are flattened down between rolls M. The flattening process takes place uniformly and smoothly inasmuch as the inclinations of the grooves l6 cause each plait to have a natural inclination in the same direction as the groove from which it was withdrawn. As the rollers ll engage successive portions of the already inclined plaits, they easily flatten the plaits down, approximately to the position indicated by Fig. 5, or to an even flatter position than can be readily shown in the drawings.

It will be observed that the action of the rollas while they are lying in the grooves.

From the foregoing, it is seen that a practical apparatus is provided for plaiting paper. The resulting paper is useful for a variety of purposes, especially if before being plaited, it had been creped. In that event, it will stretch in both directions and is extremely useful, for example, in wrapping objects of irregular shape.

In one direction the minute deformations of the creping will straighten out while in the other direction, the stretching is accomplished by a straightening out of the paper gathered in the plaiting.

In the form of the invention shown in Fig. 6, a shield 3| is provided between the sheet H and the drum 13. The purpose of this shield is to facilitate the inward gathering of the damp sheet. Under some conditions, this sheet, if in contact with drum l3, might not slide easily across the grooves IS. The inward gathering of the sheet may also be facilitated by providing slight grooves 32 in the shield 3| so disposed as to urge the sides of the sheet toward the center.

I claim:

The method of treating paper including the steps of forming in a moving web of paper open longitudinal corrugations inclined inwardly toward the center of the web from opposite sides thereof to gather the paper from both sides of the web and flattening the open corrugations against the web.

FREDERICK P. WOOD.

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

UNITED STATES PATENTS Number Name Date 2,085,417 Cramer June 29, 1937 2,117,418 Hajoway May 17, 1938

Images