Patent GB-1170298-A (GB)
Title: A Method of Embossing Repeated Patterns in Strip Material and Means for carrying out the Method
IPC: B21D53/04
Filed: 1967-02-08
Abstract: 1,170,298. Making tube-panels; shearing. SVENSKA METTALVERKEN A.B. 8 Feb., 1967 [11 Feb., 1966], No. 5968/67. Headings B3A, B3Q and B3W. [Also in Divisions B5 and B6] A method of embossing repeated patterns in strip material comprises advancing intermittently at least two webs of material in superimposed relationship, applying pressure to zones between the webs to press out a desired pattern in one web-length and at least one communicating passage leading to the next following web-length during the pauses between advances of the webs, separating the embossed length from the rest of the web material so that the communicating passage is parted to expose an opening to the next following web-length for connection to the source of pressure, and repeating the working sequence. Metal or plastics webs may be embossed which are unjoined, or the webs may be joined by an adhesive during embossing. Alternatively, plastics sheets may be welded by electric heaters in the embossing dies; metal webs may be welded together or soldered. Roll-welded metal webs may be used which have patterns of stop-weld therebetween. Apparatus for carrying out the method comprises one upper, stationary die 20 and a lower die 18 operated by an hydraulic cylinder 32. The die-surfaces may make contact, or stops may be located between them. If the pattern to be embossed is a plain area, one surface of the dies has a continuous projecting strip, forming the sides of a rectangle, the strip pressing the webs against the opposed die and confining an area to be inflated. Several strips may be used to define the pattern, and these may be on both dies if both webs are to be embossed. Alternatively, the die surfaces may be engraved, Figs. 2-4 (not shown). The inflating fluid is excluded from subsequent web-portions by projecting strips on one or both dies, or by a separate clamp which may be operated independently. Feeding the webs through the apparatus from reels 5, 6 are rollers 10, 11, 11a driven, through a gear-box 13, by an electromotor 12. A nozzle 55 for supplying inflating fluid is mounted on an arm 51 operated by a jack 52 for inserting the nozzle into the leadpassage formed in the preceding embossing operation. A plain nozzle may be used, Figs. 8 and 9 (not shown), or one having a screwthread 68, Fig. 7, and a pinion 66 by which it may be turned by a chain 57 driven by an electromotor 58. After embossing, the embossed sections are fed on to a roller-table and severed from the rest of the webs by a cutting torch, or by shears with a point (65) for severing the connecting passage (37), Figs. 5 and 6 (not shown), or by a saw 40 driven by an electromotor 45 and advanced by a jack 47. As applied to inflating previously-welded strips with an interposed step weld pattern, Fig. 10 (not shown), the composite web is fed from a single reel (72), and it is not necessary to engrave the die-surfaces. A separate clamp (75) operated by a jack (77) restricts the length of pattern inflated. The webs may be inflated hot or cold. More than two superimposed webs may be used and different patterns may be embossed side-byside, the webs subsequently being divided along their length. The apparatus may be controlled automatically from a programme.