| 摘要 |
1331627 Laminates and laminating apparatus UCB 21 Dec 1970 60585/70 Heading B5N [Also in Division D1] A method of making a laminate at least 30 centimetres wide comprising at least one plastics film and another layer of plastics, metal, fabric or paper comprises continuously supplying a solventless adhesive to a distributer means comprising a pre-dosing element and an elastic surfaced rotating element in such a manner as to coat the surface of said elastic-surfaced rotating element with a layer of solventless adhesive having a thickness of from 5 to 50 microns, transferring the layer to a moving film, the circumferential speed of the elastic-surfaced rotating element and the speed of displacement of the film being in the ratio of from 1/10 to 1/50, so that the film receives a layer of solventless adhesive of a thickness of from 0À5 to 5 microns, and in a second stage laminating the adhesively coated film to another web to form the laminate, e.g. by passing between the nip of pressure rollers. The adhesive may be transferred directly on to the film or indirectly by means of an intermediate rotating cylinder. The film to be coated and/or the web to be bonded may be a laminate, thereby enabling laminates to be formed. A suitable apparatus comprises an elastic-surfaced cylinder cooperating with the pre-dosing element which is preferably a fixed doctor bar or cylinder or a rotating cylinder, the rotation or speed of which is different from the rotational speed of the elastic surfaced cylinder; adhesive supply means adapted to feed adhesive between the predosing element and the elastic-surfaced cylinder; means for guiding a film to be coated into contact with the surface of the elastic-surfaced cylinder or with an intermediate transfer roller which is in contact with said elastic-surfaced cylinder; means for driving the elastic-surfaced cylinder and means for controlling the speed of displacement of the film, both the said means being so adjustable that the circumferential speed of the elastic-surfaced cylinder and the speed of displacement of the film are in the ratio of 1/10 to 1/50; lateral baffles which are adjustable in the width direction to vary the width of adhesive to be applied and a bonding section comprising a pair of cylinders. A counter cylinder may be provided to press the film on to the elastic surfaced cylinder or intermediate transfer roller. |
