Drawing of polyoxymethylene using dielectric heating

Details Drawing of polyoxymethylene using dielectric heating Drawing of polyoxymethylene using dielectric heating

1982-12-23

1985-02-05

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

2642884, 2642905, B29C 1702

Patent

active

044977590

ABSTRACT:
This invention discloses a continuous process for the production of polymer-polyoxymethylene (POM) having small linear expansion coefficients and high tensile modulus, the process for producing an ultrahigh modulus POM comprising the step of drawing a crystalline polymer continuously under dielectric heating while maintaining the ambient temperature at an elevated temperature by external heating, said ambient temperature being controlled to change from a lower temperature to a higher temperature along the drawing direction of said crystalline polymer with a pre-set temperature gradient.

REFERENCES:
patent: 3364294 (1968-01-01), Garibian et al.

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