US2266958A

US2266958A - Perforated web

Info

Publication number: US2266958A
Authority: US
Inventors: Wesley S Corbin
Original assignee: Scott Paper Co
Current assignee: Kimberly Clark Tissue Co
Priority date: 1939-04-01
Filing date: 1939-04-01
Publication date: 1941-12-23
Anticipated expiration: 1958-12-23

Description

Dec. 23, 1941. w. s. CORBIN PERFORATED WEB 2 Sheets-Shet 2 Filed April 1, 1939 nneuo Patented Dec. 23, 1941 PERFORATED WEB Wesley S. Corbin, Ridley Park, Pa., assignor to Scott Paper Company, Chester, Pa., a. corporation of Pennsylvania 7 Application April 1, 1939, Serial No. 265,561

4 Claims.

In the manufacture of toilet and towel papers in roll form, it is customary to provide the continuous strip of paper which forms the roll with transverse lines of perforations to thereby facilivention, I provide at each longitudinal side of the recess a blade 5, said blades being secured by screws 6 to the cylinder, and having at'their outer edges and as best shown in Fig. 2 a longitate the separation from the strip of sections or tudinal series of small teeth 1 which project individual sheets of predetermined size. The slightly beyond the peripheral surface of the cylcharacter of perforation heretofore employed is inder and penetrate the paper web 2, see Fig. 1. not highly efficient in the function of establish- Coacting with the cylinder l is a member 8 ing a line along which the paper will readily which is mounted for rotation upon a shaft 9, separate, and a principal object of this invention this shaft paralleling the shaft 3 of the cylinder.

is to provide an improved and more highly eflicient form of perforation which while maintaining the strip intact under all normal conditions will yet provide lines of rupture on which the individual sections or' sheets may be separated easily and efficiently. Another object of the invention is to provide a novel form of perforation as set forth above which'will utilize to advantage that property of the paper which creates'a tendency in the strip to tear more readily in the longitudinal than in the transverse direction.

Still another object of the invention is to provide a novel form of perforation which as each section of the paper is torn away will afford at The member 8 is axially coextensive with the cylinder and carries at its outer edge and secured thereto by bolts H a perforating head I2.

As shown in Fig. 2, the head I2 is provided with slots l3 for reception of the said bolts II for radial adjustment. The perforating head [2 the terminal end of the roll a clearly defined and highly ornamentallace-like appearance.

A further object'of the invention is to provide an improved mechanism for producing the aforesaid perforations with the required accuracy and uniformity.

In the attached drawings:

' Figur 1 is a fragmentary, more or less diagrammatic, transverse sectional view of the principal elements of a perforating machine made in accordance with my invention;

Fig. 2 is a section on the line 22, Fig. 1;

Fig. 3 is a section on the line 33, Fig. 1;

Fig. 4 is an enlarged fragmentary view showing the form of the novel perforating device;

Fig. 5 is a fragmentary enlargement showing the character of the perforation and the manner in which it functions in the sheet-separating operation;

Fig. 6 is an enlarged fragmentary view showing a modified form of perforating device;

Fig. 7 is an enlarged fragmentary view showing the character of perforation produced by the device shown in Fig. 6, and

Fig. 8 is a view corresponding to Fig. 7 show.- ing the paper sheet partially separated along the perforated line. 7

. With reference to Fig. l, the perforating mechanism therein illustrated consists of a rotary cylinder l on which travels the continuous paper strip or Web 2 which forms the roll. The cylinder is mounted upon a shaft 3 and rotates in the direction indicated by the arrow. The cylinder has in its periphery one or more axially extending recesses 4, and in accordance with the incomprises in the present instance two blades l4 and I5 which are held in spaced parallel relation by an intervening spacer plate l6, and the outer edge of each of the blades M and I5 is provided with a series of pointed teeth, H and [8 respectively, the forms of which are best shown in Fig. 4. The member 8 is rotated in synchronism with the cylinder l' and is so relatively arranged with respect to the cylinder that the outer edges of the blades I4 and I5 enter the recess or recesses 4 of the cylinder, as shown in Fig. 1. In the operation of this mechanism, the paper web 2 traveling on the face of the cylinder 1 is penetrated by the points of the teeth I! and I8 to form in the latter two closely adjoining series of angular incisions, as shown in Fig. 3, the two series or rows of incisions formed respectively by the blades l4 and I5 being designated by the reference numerals l9 and 2I. It will be noted that the teeth l1 and [8 of the blades I l and I5 are laterally relatively offset so that the incisions l9 and 2| are staggered or interspersed with respect to each other.

It will be apparent that as the blades l4 and I5 contact the paper web 2 they exert a certain amount of side thrust tending to displace the web downwardly into the recess 4. This tendency-of the paper to sag or stretch under the action of the blades is. prevented by the aforedescribed blades 5, 5, the upper toothed edges of which penetrate the web at the opposite sides of the recess and function to hold the intervening portion of the web at the top of the recess 4 in taut condition. Since the blades 5 prevent any longitudinal displacement of the web and retain the web taut in the immediate area engaged by the teeth of the blades M and [5, the incisions l9 and 2i are cleanly cut and uniformly spaced, and the device thus makes possible accurate formation in the paper of the two closely adjoining lines of incisions. H .7

It will be noted by reference to Fig. 5 that the incisions l9 and 2! of the two series are in more or less overlapping relation in the direction lonleast resistance to tear. It will be noted further that the distance between the proximate ends of the V-shaped incisions 2i and the sides. of the correspondingly shaped incisions L9 in the direction longitudinally of the sheet is relative- 1y small, and it is at these points that the paper ruptures when the one section is pulled :away from the adjoining section. This is clearly shown in Fig. 5. Thus the individual sections or sheets defined by the lines of incision are connected together at a number of small juncture areas extending in series transversely of the strip, and each of these areas lies longitudinally .of the paper web, or substantially so, between two closely adjoining incisions. Also'by reason of the staggered relation of the incisions, the latter establish lines of connection between each adjoining pair of the juncture areas, and since "each juncture area is thus connected to the immediately adjoining areas by the respective incisions, it will be apparent that in separating the individual sheets rupture of the web occurs only within said juncture areas and longitudinally of the sheet.

It will be noted that when the sections of the sheet are separated as described along the lines of incisions, the edges of the sheets at the line of separation are left with a highly ornamental and symmetrical pattern, as indicated at 22 in Fig. 5. This ornamental appearance at the edge of the residual portion of the web is accen- 'tuated and enhanced by the line of perforations or indentations '23 whichare formed in the sheet by the teeth of the sheet-retaining b1a'des5.

In the 'aforedescribed embodiment of my invention, the teeth I! and I8 of the blades f4 and 15 are caused to penetrate the'paper to an extent afiording two clearly defined lines of V- shaped incisions, each separate incision of both series being'separate from each other and .from the incisions of the adjoining series. In the embodiment of my invention shown in Figs. 6.- 7 and '8, the teeth H and I8 are caused to penetrate the sheet to an extent such that the "incisions of one series intersect the incisions of the other, and it is apparent that if blades of the character of those shown in Figs. 1,2 and "4 are employed, the paper strip would be completely divided "by these incisions into a plurality of sections. By modifying one of the blades, as shown in Fig. 6, by cutting away portions of certain of the teeth, the continuity of the incision may be interrupted, see 'Fig. 7, to leave 7 the strip intact at a plurality of points along the lines of incision. With this form of incision, the adjoining sections of the paper strip at opposite sides of the incision line are joined together at a relatively few number of points, and "preferably these points of connection are somewhat greater in extent than those in the previously'described embodiment wherein the number of connecting points-is relatively great. In this'arrangement, however, when tensile force is placed upon the sheet, the latter will tend to tear along "the line of incision and between the terminal ends of the adjoining incisions in a direction longitudinally of the sheet or in the direction of the grain, as in the embodiment previously described.

.same direction and being relatively arranged so that the apex of each of the incisions of one row is directed into the space between the two adjoining incisions of the other row, some at least of the incisions of one row being non-intersecting with respect to the adjoining incisions of the other row so as to leave a plurality of small area-sci uncut paper extending in each instance between a terminal edge of an incision of one row and .a side of an incision of the other row, and uniting said separable sections of the web.

-2. A paper or like web having therein two contiguous, laterally oflset and separately formed rows of V-shaped incisions jointly defining one edge of a separable section of said web, said incisions having their apices all .pointing in the direction of the natural .grain of the paper and being relatively arranged so that the apex of each of the incisions of one row is directed into the space between two adjoining incisions of the other row, some at least of the incisions of one row being non-intersecting with respect to the adjoining incisions of the other row so as to leave a plurality of small areas of uncut .paper extending in each instance in the direction of said grain between a terminal end of an incision of one row and a side .of an incision of the other row, and uniting said separable sections of .the web.

3. A paper or like web having therein two contiguous, laterally offset and separately formed rows of V-shaped incisions jointly defining one edge of a separable section of said web, said incisions having their apices all "pointing in the same direction and being relatively arranged so that the apex of each of the incisions of one row is directed into thespace between .two adjoining incisions of the other row, the incisions of one row lying in proximity to but not intersecting the incisons of the other row so as to'leave a longitudinal series of small areas of uncut paper extending in each instance between .a terminal end of an incision of one row and a side or an incision of the other row, and uniting .said separable sections of the web.

4. A paper or like web having therein two contiguous, laterally ofiset and separately formed rows of V-shaped incisions jointly .defining one edge of a separable section of said web, said incisions having theirapices all pointing in the direction of the natural grain of the paper and being relatively arranged so that the apex of each of the incisions of one row is directed into the space between two adjoining incisions of the other row, the incisions of one row lying in proximity to but not intersecting the incisions of the other row so as to leave a longitudinal series of small areas of uncut paper extending in each instance in the direction .of said grain between a terminal end of .anincis'ion of one row and a side of an incision of the other row, and uniting said separable sections of the web..

' WESLEY S. CORBIN.