US2464131A

US2464131A - Paper can body

Info

Publication number: US2464131A
Application number: US606997A
Authority: US
Inventors: Guyer Reynolds
Original assignee: Waldorf Paper Products Co
Current assignee: Waldorf Paper Products Co
Priority date: 1945-07-25
Filing date: 1945-07-25
Publication date: 1949-03-08
Anticipated expiration: 1966-03-08

Description

R. GUYER PAPER CAN BODY Filed July 25. lS

March 8, 1949.I

Patented Mar. 8, 1949 UNITED STATES PATENTV OFFICE PAPER CAN BGDY Reynolds Guyer, St. Paul, Minn., asslgnor to Waldori' Paper Products Company, St. Paul, Minn., a corporation of Minnesota Application .my z5, 1945, serial Ne. 606,997 claims. (ci. 229-45) 1 My invention relates to an improvement in paper can body. The method of forming this can body and the apparatus for performing the method are disclosed in a copending application Serialhave proven satisfactory insofar as4 containing packaged products is concerned, their manufacture has certain diiiiculties. In the first place such tubes normally must be formed in long lengths and then cut into smallerlengths, there' by requiring two separate operations. In the second place, it is usually necessary to either wrap a label on such a can body or else to print the Y body after formation thereof. Furthermore such can bodies often have spiral grooves extending about the same which detract from their appearance and strength. t

It is the object of the present invention to produce can bodies out of nat sheets of paper stock. This at stock may be easily printed before the bodies are formed, thereby obviating the requirement for a separate label. Furthermore, the can bodies may be stored in flat form until they are desired, and then quickly formed into tubular formation. As a result it is not necessary to maintain a large inventory of formed paper can bodies which require costly spaceto store before use.

A feature of the present invention, residesin the formation of cylindrical can bodies by bending a plurality of at sheets into tubular formation with one sheet overlying the other. As a. result a cylindrical can body may be formed of a plurality of laminations of paper board or the like.

A further feature of the present invention lies in the provision of a can body constructed of sheets of paper board bent yinto cylindrical form to provide a laminated body, and in so placing the sheets that the butt edges of the various laminations are in angular-ly spaced relationship.

An additional object of the present invention is to produce a can body structure of` a series of overlying sheets coated with a. thermoplastic coating. Thus when the ilat sheets have been bent into cylindrical form 'and are .positioned in overlying relationship, these sheets may be ad? hered together by the application of heat and pressure. v

These and other objects andnovel features of my invention will be more clearly and fully set forth in the following specication and claims.

In the drawings forming a part of my speciiication:

Figure 1 isa perspective view of a can, the body of which has been formed by my method.

Figure 2 is a sectional view through the can body lshowing the construction thereof.-

Figure 3 is a sectional view through a modiiiedform'of can body construction. @Figure 4 is a perspective view of one of the sheets of which the can body shown in Figure 3 vis formed before the sheet is bent into cylindribody are exposed on theinner surface of the l having three plies of material, but using only twov v cal form.

The can A` shown in Figures 1 and 2 of the drawings includes a cylindrical side wall- B made of paper orsimilar material bent from at into cylindrlcalform. The can'A is shown having metal ends Il` and I2 which are crimped onto the ends of the side wall B in the usual manner. The closure Il may include a lling aperture normally closed by a plug cap I3 if it is so desired. Can ends of the type illustrated have been commonly used for considerable period of years.

In order to show the construction of the side Wall body A, I have shown this lbody in section in Figure 2- of the drawings. Figure 2 illustrates an inner sheet I4 which is provided with butting longitudinal edges I5 and i6. This inner sheet I4 isencircled by a second or outer sheet I1 having butting longitudinal edges i9 and 20. The sheets I4 and I1 are secured together byl any suitable means lsuch as the layer o f thermoplastic adhesive 2| between these sheets. Other adhesive could likewise be used but the thermoplastic adhesive is to be preferred.v

Figure 3 of the drawings shows a modified form of construction particularly suited for containing liquids or thev like. In this form of construction C, no cut edges of any of the .sheets forming the can, thus preventing any tendency for the body forming'material to absorb moisture by wicka'ge. Furthermore thelcan body C results in a structure iiat sheets of material.

InV the can body construction C, the inner sheet 23 is folded

vat

24 and 25 along parallel lines so that the

longitudinal edges

26 and 21 thereof may overlie portions of the intermediate section of the sheet. In other words, as illustrated in Figure 4 j the sheet'i's'divided into three panels comprising an intermediate panel and two end panels foldably connected thereto along. parallel fold lines. The end panels are each of about one-fourth the area of the intermediate panel so that when the inner sheet is curved as illustrated in Figure 3 the

outer panels

26 and 21 will form a substantially semi-circular double sheet.

The outer sheet 29 of the can wall body is formed similarly to the inner sheet and includes a central panel 30 and two end panels 3l and 32 connected thereto along parallel lines of

fold

33 and 34. These end panels 3l and 32 comprise approximately one-quarter of the area of the panel 30 so that when the outer sheet 29 is folded as illustrated in Figure 4 the panels 3| and 32 form a substantially semi-circular double thickness portion.

When the two sheets 23 and`29 are folded as shown the

marginal edges

35 and 36 of the

panels

26 and 21 respectively, abut the

edges

31 and 39 of the panels 3| and 32. Accordingly a can body is formed of three thicknesses of material which has no raw edges exposed either to the inside or to the outside ofthe body.

It will be noted that the can body material forming the liner of the wall is provided with two abutting

folds

24 and 25, While the outer covering sheet 29 is likewise provided with two

abutting folds

33 and 34, exposed to the outside of the can. The

raw edges

35, 36, 31 and 39 are concealed, being locked between midpoints of the covering panels.' As the ends of the tubular body are contained Within the beaded edge of the can end, the can wall body is protected from wicking or moisture absorption.

The can body wall shown in Figure 3 may be provided with ends similar to that illustrated in Figure 1 of the drawings. When thus equipped a can wall which is liquid tight and wick proof is provided. This is particularly true if the sheets forming the can body are coated with a thermoplastic coating or a waterproof coating' which will prevent the liquid from penetrating into the wall. The thermoplastic coating provides a tight joint between the various laminations, thus preventing liquid from escaping between the Various plies.

In accordance with the patent statutes, I have described the principles of construction and operation of my paper can body, and while I have endeavored to set forth the best embodiment thereof, I desire to have it understood that obvious changes may be made within the scope of the following claims without departing from the spirit of my invention. v

I claim:

1. A can comprising a can wall including an inner sheet comprising a central panel and end panels foldably secured thereto to overlie end portions of the central panel, the folded edges of said central panel being in abutting relation,

and a second sheet having ends in abutting relation secured to encircle said first named sheet.

sheets of fibrous material, one of said sheets comprising a central panel and end panels foldably connected to opposite edges of said central panel to overlie portions of said central panel, said folded edges of said central panel being arranged in abutting relation, and the other of said sheets having edges in abutting relation, the butt joint of one sheet being angularly spaced from the butt joint of the other.

3. A can comprising a can body wall, said wall including a pair of laminations, the inner of said laminations including a central panel formed in tubular form with the edges thereof in abutting relation, and end panels foldably connected to said central panel along said abutting edges, the outer of said laminations encircling the inner lamination and including a central panel having ends in abutting relation, and end panels connected to said central panel along said abutting edges, the extremities of ,said end panels of said inner lamination facing the extremities of the end panels of said outer lamination. y

4. A can comprising a can body wall, said wall including a pair of laminations, the inner of said laminations including a central panel formed in tubular form with the edges thereof in abutting relation, and end panels foldably connected to said central panel along said abutting edges, the

louter of said laminations encircling the inner lamination and including a central' panel having ends in abutting relation, and end panels connected to said central panel along said abutting edges, the extremities of said'end panels of said inner lamination facing the extremities of the end panels of said outer lamination, and a coating of thermoplastic adhesive between said laminations for securing the same together. u

5. A can comprising a can body wall, said wall including a pair of laminations, the inner of said laminationsincluding aV central panel formedfln REFERENCES CITED The following references areV of record in the iile of this patent:

lUNITED STATES PATENTS Number Name Date 1,463,437 Oliver July 31, 1923 1,741,809 Benson Dec. 31 1929- 2,149 .030 Moore Feb, 28, 1939 2,155,487 Hatch v Apr. 25, 1939