| 摘要 |
852,025. Moulding resilient cellular materials. DUNLOP RUBBER CO. Ltd. June 7, 1957 [Aug. 10, 1956], No. 24505/56. Class 87(2). [Also in Group VIII] A layer of a mouldable cellular substance capable of conversion into resilient cellular material is formed on a supporting surface, depressed along lines constituting the outlines of a plurality of shaped articles sufficiently or insufficiently to cause separation of the articles, converted into the resilient cellular material, and separated if necessary into the articles. The supporting surface may be a travelling endless belt conveyer 12, used either with side pieces mounted on it or in conjunction with endless belts travelling at the same speed and running in vertical or steeply inclined planes at its two sides, the depressions being formed by a roller 13 provided with ridges 15. Suitable resilient materials include foam rubber and certain resilient expanded synthetic resin compositions, e.g. based on polyvinyl chloride, copolymers of vinyl chloride with vinyl acetate or vinylidene chloride, or polyurethanes. Backings or facings of textile fabrics or other flexible sheet material may be incorporated by laying the material on the supporting surface before the layer of mouldable substance is formed. In the case of textile fabrics, the necessary adhesion is provided by penetration of the foamed rubber dispersion or the like into the interstices of the fabric but otherwise an adhesive is necessary, Specification 785,256 is referred to. |
