Patent GB-1071093-A (GB)
Title: Tubular laminated bodies having at least three discrete sides
IPC: B31D1/00
Filed: 1964-05-14
Abstract: 1,071,093. Making containers; laminates and laminating. M. M. YOUNG. May 14, 1964, No. 20142/64. Addition to 1,038,035. Headings B5D and B5N. [Also in Divisions B8 and F2] A tubular container body having at least three, and preferably four, discrete sides, is formed from a laminated strip having waterproof inner and outer layers 16 and 40 respectively and an intermediate reinforcement layer 18, 38 outwardly directed confronting side edges 63 of the strip inner layer being joined together with a first longitudinally extending butt - joint and inwardly directed confronting side edges 65 of the strip outer layer being joined together with a second longitudinally-extending butt-joint which is offset peripherally with respect to the first butt-joint. The waterproof layers are preferably formed by layers of nylon, " Mylar " (Registered Trade Mark), propylene or metal foil. Alternatively, the waterproof layers may each be formed by a layer of paper impregnated with a waterproof material. In the preferred embodiments strips 16 and 40 of aluminium foil are drawn from rolls 12 and 36 and bonded to strips 18 and 38 of paper respectively to form laminates 32 and 54 subsequent to passing over adhesive applicators 22 and 44 and through guides 28 and 46 which orientate the strips with respect to each other. The guide 28 also adheres a nylon tear 100, Fig. 2 (not shown), to the strip 16. The laminates 32 and 54 then pass respectively through folders 30 and 52 which cause the edges of the waterproof strips 16 and 40 to overlap the edges of their respective reinforcing strips 18 and 38 to form the inwardly and outwardly directed side edges 65 and 63 previously referred to. Applicator 62 applies adhesive to the strip 32 and the two laminates are fed through a guide 56 which affects the two strips with respect to each other so that rollers 58 and 60 produce a composite laminate strip 64 having longitudinally-extending shoulders 66 and 68 on opposite sides thereof, Fig. 3 (not shown). The apparatus and method described up to this point is as disclosed in the parent Specification 1,038,035. The composite laminated strip 64 is fed between a skelping folder 70 and a stationary rectangular mandrel 72, Fig. 4 (not shown), adhesive being applied to the shoulders prior to their interengagement. The tube thus formed has inner and outer waterproof layers joined along peripherally spaced longitudinal butt-joints and is of uniform wall thickness. A roller 80 consolidates the joint and rollers 81 and 81<SP>1</SP> draw the tube from the mandrel. An electric eye 82 on detecting a mark on the formed tube actuates a reciprocating orbital cutter 84 which cuts individual container bodies 86 from the tube. The tube may be formed from a laminated strip formed by three or more sub-laminates, Fig. 6 (not shown). The tear strip 100, Fig. 5, extends around the proposed tubular container between the waterproof inner layer (16) and the adjacent reinforcing paper layer (18) and out through the outer butt-joint so that by pulling on its end tab (102) the strip will sever the two paper layers (18 and 38) and the outer waterproof layer (40).