Reinforcing a layer of plastics material

B - Operations – Transporting – 30 – B

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154/40, 154/41

B30B 5/02 (2006.01) B29C 33/00 (2006.01) B29C 51/28 (2006.01) B29C 70/08 (2006.01) B29C 70/44 (2006.01) B29C 43/12 (2006.01)

Patent

CA 1128846

ABSTRACT OF THE DISCLOSURE A method of reinforcing a layer of plastics material is described. This method uses an apparatus which comprises a base with an upper support thereon, the support having a flat or dished surface bounded by a gutter having at least one channel communicating with an outlet connected to vacuum means, and a seal bounding the gutter and outlet. The method in question comprises the steps of: (a) applying the layer of plastics material to the support, (b) applying at least one layer of fibrous reinforcement to at least the flat or dished area of the plastics material, (c) applying a polymerizable resin to the fibrous reinforcement, (d) laying at least one flexible plastics membrane, correspondingly shaped to the surface, over the support so as to overlap the seal, (e) drawing air from the outlet so as to form an at least partial vacuum between the membrane and the surface and to impregnate the reinforcement with the resin, and (f) polymerizing the resin, or allowing it to polymerize, any resin surplus to that required to impregnate the fibrous reinforcement being received by the gutter in the plastics material.

323571

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