INTEGRATED MOLDED BODY

WIPO Patent Application WO/2019/044693

A1

The purpose of the invention is to solve the problem of decreased strength/rigidity in the weld line of an injection molded body, and enable free design, such as the injection molding of thin-walled products or products having complicated shapes. Provided is an integrated molded body in which a reinforcing substrate having a discontinuous fiber and a resin is integrated with an injection molded body having a discontinuous fiber and a resin, wherein the reinforcing substrate is integrated with the injection molded body so as to cover a portion or all of the weld line of the injection molded body, and the ratio of the thickness Ta of the reinforcing substrate to the thickness T of a weld line portion of the integrated molded body satisfies the following relation: Ta/T≤((Ebw-√(Ea·Ebw))/(Ebw-Ea)) when Ea≠Ebw, and Ta/T≤0.5 when Ea=Ebw, where Ta is the thickness of the reinforcing substrate, T is the thickness of the weld line of the integrated molded body, Ea is the flexural modulus (width direction of the weld line) of the reinforcing substrate, and Ebw is the flexural modulus (width direction of the weld line) of the weld line portion of the injected molded body.

SUZUKI TAKAFUMI (JP)
SENTO YUICHIRO (JP)
IMAI NAOKICHI (JP)
HAMAGUCHI MITSUSHIGE (JP)
HONMA MASATO (JP)

PCT/JP2018/031339

March 07, 2019

August 24, 2018

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TORAY INDUSTRIES (JP)

B29C45/14; B29C70/12; B32B5/28

JP2004082470A	2004-03-18
JP2005022302A	2005-01-27
JP2001341216A	2001-12-11
JP2013226815A	2013-11-07
JPS60260313A	1985-12-23
JP2000167863A	2000-06-20
JPH09272134A	1997-10-21
JP2010253938A	2010-11-11

POLYMER ENGINEERING AND SCIENCE, vol. 14, no. 2, 1974, pages 147

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