| 摘要 |
<p>Case No M30964/CANADA Specification for Application claiming priority of corresponding UK Application No 7932062 dated 15.9.79 Inventors: William Charles Aston of 39 Quarry Lane, Hasbury, Halesowen, Birmingham and Derek Walker of 10 Woodlands Avenue, East Ardsley, Near Wakefield, Yorkshire, both British Subjects. TITLE: Manufacture of thermoplastics pipe APPLICANTS: IMI Yorkshire Imperial Plastics Limited, (formerly Yorkshire Imperial Plastics Limited), a British Company of, PO Box 166, Leeds LSl lRD. A method of manufacturing thermoplastics pipe by the radial expansion of a pipe blank within a mould. The blank 28 is inserted horizontally into a raised central mould portion 12, with the ends of the blank 28 extending outwardly of the ends of the central mould portion 12. Portion 12 is then lowered to a first position where mandrels 19, 20 enter the blank 28 from each end, and then a second position where mould end caps 15, 17 are closed onto the central mould portion 12, and heating and expansion of the blank 28 is then effected.</p> |
