Patent GB-457684-A (GB)
Title: Improvements in containers having end closures and made wholly or in part of paper or other fibrous material or plastic material, and methods of making the same
IPC: B65D3/22
Filed: 1936-01-04
Abstract: 457,684. Paper &c. containers. MOORE, G. A., Kentucky Hotel, Louisville, Kentucky, U.S.A. Jan. 4, 1936, No. 361. [Class 18] In making an impervious container com. prising fibrous or plastic material such as kraft and other paper and /or synthetic resin, cellulose acetate or nitrate film, an impervious flanged head 23, Figs. 6, 11 and 16, is inserted in the body with the flange engaging the marginal portion of the body and with a film of adhesive lacquer having potential adhesive qualities between the two parts, the lacquer being activated by heat or a solvent &c. during or after the insertion of the head, an impervious joint being formed between these parts by pressure and the marginal portion being then curled &c. into interlocking engagement with the flange at 16a. The head 23 has a furrow or hatch 57 to facilitate opening when digital pressure is applied at a point indicated by an embossed button 59, ribs 58, 58a constituting bending lines being provided. A fibre board cover 25 furnished with a thin sheet 251 of coloured cellulose is adhesively attached by its tab 25b and has ribs 42d, 79a co-operating with grooves 42, 79. A flange and a projecting rib form a channel 25d into which the upper rim of the container extends when the cover is closed down, a rib 78a being held resiliently in register with a groove 78. After the container has been filled, a bottom 24 is secured in position. Various lacquers and materials used in making the container .are specified below. The container body is formed from Kraft and other paper blanks 22, Fig. 8, adhesively coated, and some treated with water or solvent, successively fitted between a reciprocating resilientlymounted anvil 26 and an expanding mandrel 17, reciprocating flexible wrapping-plates 27 acted on by spring plates 28, 29 pressing the blanks into position and into contact with one another. Inwardly-pivoting locking-members cause the ends of the blank to overlap at 31, where they are united by lowering an iron 32 heated by an electric element 33, which sets the adhesive. The mandrel 17 may be rotatably mounted in a rotating turret, each blank being applied at a different station to space apart the laps of alternate laminations. The formed shell is then clamped and acted upon by dies which form inwardly extending ribs 42, Fig. 6, with ledge portions 42a, straight parts 42b and inclined parts 42c. The shell is then removed by collapsing the mandrel by moving the central element to cause enlarged parts 43a, 43b to register with recesses 17a, 17b. The heads 23, 24 are made from fibre board and aluminium or lead foil blanks by embossing and drawing operations. The blank therefor is inserted between a female die 46, Fig. 11, and a yielding member 47 acted upon by a male die 48 carrying a relatively-movable stripper 49 co-operating with a buffer die 52. The dies are moved to the right by shafts 50, 51, an arcuate bead 53 forming a groove and complementary rib, whilst a removable knife 56 makes the furrow &c. 57 without cutting through the blank, the ribs 58, 58a and buttons 59 being formed by contours on the dies. A pad 62 deposits solvent and the head is then moved into the shell, which is held by a revoluble and longitudinally movable chuck, being guided thereinto by metallic plates, the clamped flange of the head depositing some solvent on the liner of the shell. The dies &c. are withdrawn and the shell margin is by means described curled or flowed over the flange to form an impervious seam. The shell is then moved into an expansible die 75, Fig. 16, having ribs 76 for forming the grooves 78, 79, and a collapsable male die 80 is expanded to press the margin 16a of the shell wall into contact with the flange. A bolster 81 having electric heating coils actuates the coating to complete the joint. The inner surface of the inner layer of the shell may have a coating of a nitro cellulose or cellulose acetate lacquer, which may contain a plasticizer such as dibutyl phthalate ; vegetable oils, gum, synthetic or natural resin, and the outer layer may be of sulphate paper with designs printed thereon and a lacquer film described. The solvent applied to the pad 62 may be mono-methylethylene glycol and ethyl acetate.