Plastic glass
First Claim
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1. A process for producing plastic materials comprising:
- (a) providing an injection mold machine having a cavity therein for forming of a transparent plastic article simulating glass, said mold including a pressure sensing and regulating apparatus;
(b) closing the mold and injecting a clear plastic material into the mold and using a portion of the mold to pressurize the mold such that a portion of the mold material is forced back into an injection port formed in the mold, the injection port being in communication with at least a portion of said cavity of said mold; and
(c) maintaining the mold at a predetermined pressure wherein internal stress in said plastic material is reduced for optimizing optical properties of said plastic material to be similar to glass for mirrors;
wherein a vehicle mirror element is formed from said plastic material.
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Abstract
A method of manufacture of high optical quality transparent plastic for use as a mirror or glass substitute.
5 Citations
22 Claims
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1. A process for producing plastic materials comprising:
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(a) providing an injection mold machine having a cavity therein for forming of a transparent plastic article simulating glass, said mold including a pressure sensing and regulating apparatus;
(b) closing the mold and injecting a clear plastic material into the mold and using a portion of the mold to pressurize the mold such that a portion of the mold material is forced back into an injection port formed in the mold, the injection port being in communication with at least a portion of said cavity of said mold; and
(c) maintaining the mold at a predetermined pressure wherein internal stress in said plastic material is reduced for optimizing optical properties of said plastic material to be similar to glass for mirrors;
wherein a vehicle mirror element is formed from said plastic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for producing plastic materials comprising:
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(a) providing an injection mold machine having a cavity therein for forming of a transparent plastic article simulating glass, said mold including a pressure sensing and regulating apparatus and control for monitoring and controlling injection molding parameters of pressure and volume;
(b) closing the mold and injecting an initial volume of a clear plastic material in to the mold and using a portion of the mold to force from about 20% to about 60% of the mold material back into an injection port formed in the mold, the injection port being in communication with at least a portion of said cavity of said mold; and
(c) maintaining the mold at a predetermined pressure of greater than about 900 bar for reducing shrinkage and internal stress in the plastic material for optimizing optical properties of said plastic material to be similar to glass for mirrors;
wherein a vehicle mirror element is formed from said plastic material. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification