| 摘要 |
1,089,130. Moulding plastics material. KAY MANUFACTURING CORPORATION. Dec. 31, 1965 [Feb. 16, 1965], No. 55472/65. Heading B5A. An article, e.g. a cushion, of polyurethane foam is produced in a mould cavity 12 provided between separable parts 10, 11 of polyurethane foam located within housings 16, 19. Removable liners 14, 21, e.g. of polyethylene, are located adjacent the cavity walls and extend from the adjacent surfaces of the mould parts. The liners are impervious to the generated foam, but the liner 24 is perforated at 22 for the escape of gases which pass through the mould wall to an outlet 20 to which suction may be applied. Suction may also be applied to the passage 18 to hold the liner 14 in place. If the perforations in the liner 24 are relatively large, a sheet 23 of tissue paper or the like is located between the liner and mould wall to absorb any liquid foam and to allow the flow of gas. Instead of two liners, a single bag-like liner may be provided. A netting 26 may be positioned between the mould parts to act as a support for the article when transferring it from the mould to a curing oven. In a modification the perforations are relatively large to allow the passage of a small quantity of foam which acts as an adhesive to secure a cushion cover to the liner. The cover is located around the liner in the mould and may be of bag form. The gases from the mould may be led to a gas scrubber (51), Fig. 9 (not shown), where they may be diluted with air supplied thereto at (52) or washed by liquid, the resultant material being finally discharged from an outlet (53).
|
