Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1975-10-22
1977-12-06
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
425388, B29C 1704
Patent
active
040617068
ABSTRACT:
A process for the continuous melt thermoforming of thermoplastic polymers is disclosed. The process comprises extruding a flat web of molten polymer in a downward direction and directly over a series of mould cavities moving at a predetermined speed thereby sequentially covering the mould cavities. A vacuum is applied to the mould cavities and the web of molten polymer is brought into contact with the surface of the mould cavity, the mould defining the mould cavity being comprised of porous metal. The polymer is cooled and the resultant article is removed from the mould. The process is controlled so that the articles thermoformed in the process are of substantially uniform thickness. In embodiments the mould cavities are located on the periphery of a continuous belt or preferably a wheel. The process may be operated with polymers of low zero shear viscosity. The preferred polymers are polyamides, especially polyhexamethylene adipamide, of relative viscosity in the range 25 to 65. Substantially inflexible open containers comprised of a polyamide having a relative viscosity in the range 25 to 65 are also disclosed. The containers may be of thickness in the range of 2 to 30 mils.
REFERENCES:
patent: 3333032 (1967-07-01), Dickinson
patent: 3353219 (1967-11-01), Snyder
patent: 3381445 (1968-05-01), Vogt
patent: 3453162 (1969-07-01), Turner
patent: 3527854 (1970-09-01), Martin et al.
patent: 3685930 (1972-08-01), Davis et al.
Crowell Donald Edward
Duffield Peter Roe
Flockton Peter Robin
Lillis Rupert Martin
Turner Brian Maurice
Du Pont of Canada Limited
Silbaugh Jan H.
LandOfFree
Process for the continuous melt thermoforming of polymers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the continuous melt thermoforming of polymers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the continuous melt thermoforming of polymers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1550882