GB1036126A - Improvements in or relating to the manufacture of cellular structural materials - Google Patents

Abstract

1,036,126. Laminates and laminating. CROSBY & CO. Ltd., and SPICERS Ltd. June 13, 1963 [March 14, 1962], No. 9874/62. Heading B5N. A stack of flexible material, e.g. paper or chipboard, which can be opened out to form a cellular structure (as shown in section in Fig. 9) and comprising sheets 59 joined by strips 58, is formed by slicing a first web into strips, securing the strips to one face of a second web so that they extend side by side along the run of the web, each strip being secured by discrete lengths of one edge portion of one of its faces along corresponding discrete lengths of the second web, severing the resulting composite web into said discrete lengths and forming them into a stack in which the free edge portions of the other face of the strips is secured to the free face of the length of second web adjacent in the stack. Apparatus, Fig. 1, comprises rolls of web material 58, 59 mounted on spindles 1 and 2. Web 58 is drawn over rolls 3 and 4 and passed between rolls 5 and 6 which are provided with interengaging slots and cutting teeth to produce parallel lines of perforations 60 (Fig. 3, not shown) in the web to assist subsequent bending of the strips when the stacked sheets are opened out; scoring or other means may be used instead of perforations. The web then passes between rolls 10 and 11 of adhesive applicator B whereby parallel bands of adhesive 61 are applied for a discrete length of the web after which adhesive applicator B is moved out of engagement by links 12, 13, 14 and applicator C is moved into engagement with the web to produce another set of parallel adhesive bands 62 extending an equal discrete length and offset from the first bands 61. Cutting wheels 16, 17 arranged to have a scissor-like cut then slice the web into strips so that the adhesive bands 61 and 62 extend along opposite edges of the face of each strip (Fig. 4, not shown). The second web 59 is then united with the slit web 58 by passing them through rolls 19, 20 and 21, 22, the former having cutting wheels at their extremities to trim the edges of the composite web. Adhesive bands are then applied on the opposite faces of the strips at their free edges, by means of the applicators F and G which are arranged to apply parallel bands of adhesive over discrete lengths in staggered relationship as did the applicators B and C. At the severing station H the composite web is cut into the aforesaid discrete lengths by the rotary knife 26 cooperating with a stationary blade 27, the cut lengths being fed forward by rolls 28, 29, the roll 28 being composed of discs with segments removed to give correct timing. Rolls 31, 32 pass the lengths on to a slatted platten 40, which is provided with positioning guides for the web, and is arranged to move vertically under the control of a cam 46, spring 45 and toggle mechanism 44. As the platten moves upward with the web length on it, sets of fingers 51, 52 are retracted to allow it to pass and a similarly operated platten 47 comes down to meet it. The fingers 51, 52 return to the position shown and are then just below the raised platten 40, which is now lowered, the fingers passing between the platten slots to support the length of web pressed against the upper platten. A further length of web is now delivered to the lower platten and the process repeated until a stack of the desired thickness has been built up whereupon it is pushed forward by a pusher 55 and delivered to a table by feed rolls 56, 57. The roll 31 is in the form of spaced discs to allow the fingers 51 and the pusher 55 to pass through. The platten 40 may be cushioned to maintain an even pressure on the stack as it builds up.