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CA1127948A Expired / Lapsed CA ⏱️ 0.0 years remaining

Method of manufacturing automobile windshield

Assignee: Mitsubishi Chemical Corp
•
Filing: 1977-09-22
•
Granted: 1982-07-20
•
Expires: 1997-09-22
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Abstract

Abstract ABSTRACT OF THE DISCLOSURE An automobile windshield is manufactured by laminating a pair of curved glass sheets with an interlayer film. The inter-layer film is manufactured by heating a ribbon interlayer film to an elongatable temperature while continuously transferring the film and winding the interlayer film up on a cone shape drum while elongating the film with a varying elongating distribution in the transverse direction so as to curve the interlayer film in longitudinal direction. The tinted part is formed at upper end in parallel to the edge of the windshield by elongating the ribbon interlayer film with varying elongating distribution in the transverse direction.

Inventors

  • 👤 Kyo Toyoshima
  • 👤 Haruhiko Kaki
  • 👤 Kooji Suda
  • 👤 Yozo Ogawa

Bibliographic Details

Application Number —
Jurisdiction CA
Data Source google_patents
Last Synchronized 2026-10-25 03:14
CPC Classifications
—

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 103 words
A method of manufacturing an automobile wind-shield which comprises laminating a pair of curved glass sheets with an interlayer of polyvinylbutyral film having a tinted strip in the longitudinal direction, comprising: a) continuously passing said polyvinylbutyral film to a heating zone and heating said polyvinylbutyral to 40 to 60°C; b) elongating said poly-vinylbutyral film in the longitudinal direction by an amount which varies in the transverse direction to curve said poly-vinylbutyral film by continuously winding said heated polyvinyl-butyral film on a conical drum; and c) heating said curved polyvinylbutyral film at from 60 to 90°C to release the strain induced by said elongation.
Claim 2
Independent Claim 103 words
A method of manufacturing an automobile wind-shield which comprises laminating a pair of curved glass sheets with an interlayer of polyvinylbutyral film having a tinted strip in the longitudinal direction, comprising: a) continuously passing said polyvinylbutyral film to a heating zone and heating said polyvinylbutyral to 40 to 60°C; b) elongating said poly-vinylbutyral film in the longitudinal direction by an amount which varies in the transverse direction to curve said poly-vinylbutyral film by continuously winding said heated polyvinyl-butyral film on a conical drum; and c) heating said curved polyvinylbutyral film at from 60 to 90°C to release the strain induced by said elongation.
Claim 3
Dependent Claim 19 words
The method of claim 1 wherein the polyvinylbutyral. interlayer film is wound upon said conical drum through pinch rolls.

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