Title:
MANUFACTURE OF EXTRUDED ARTICLE
Document Type and Number:
Japanese Patent JPS60159028
Kind Code:
A
Abstract:
A core (13) of polyethylene terephthalate containing 0 to 50% mineral fillers and having a semi-crystalline structure, and a coating layer (14, 15) made from at least one other thermoplastics material are co-extruded as a flat sheet or tube. Immediately after extrusion, the coating layer (12) is cooled by treatment by means (20,21,22) having a temperature lower than the crystallisation temperature of the filled polyethylene terephthalate, e.g. of the order of 40 to 80 DEG C, and the coating layer of other thermoplastic performs as a thermal buffer to slow down the equalisation of temperature between the polyethylene terephthalate and the said means (20, 21,22) in such a way as to ensure that the polyethylene terephthalate which is still fluid cools sufficiently slowly to have the required semi-crystalline structure. The treatment means may comprise a cooler (20) which does not effect further shaping, or a moulding means which further shapes the still fluid core, such as a calender (21), or a sheet stamping means (22), or a blow moulding means (Figure 2, not shown) which acts on a tubular extrusion.
Inventors:
ANTOWAANU BASHIU
Application Number:
JP27106084A
Publication Date:
August 20, 1985
Filing Date:
December 24, 1984
Export Citation:
Assignee:
CIBIE PROJECTEURS
International Classes:
B29C48/06; B29C49/22; B29C51/14; B29K67/00; B29L9/00; (IPC1-7): B29C47/06; B29C47/88; B29K67/00; B29L9/00
Attorney, Agent or Firm:
Saburo Kimura