MOLDED ARTICLE OF COMPOSITE RESIN CONTAINING FIBERS
A molded article of a composite resin containing fibers includes a base resin 1 and a fibrous filler 2 having fibrillated ends in a fiber length direction. An expression Ho×0.4≤H≤Ho is satisfied where H is a maximum height for an unbroken first plate-like test piece having a thickness of 1 to 2 mm after the test piece is kept at −10° C. for three hours and then is hit by a dropped weight of 250 g; and Ho is as same maximum height for the unbroken second plate-like test piece only made of the base resin with a thickness of 1 to 2 mm as for the first plate-like test piece. An expression So× 0.4 ≤S≤So is satisfied where S is a Charpy impact strength (JIS K 7111) of the molded article, and So is a Charpy impact strength of the molded article only made of the base resin.
1 . A molded article of a composite resin containing fibers, the composite resin containing a fibrous filler in base resin,
wherein the fibrous filler has a fibrillated part on each end of the fibrous filler in a fiber length direction,
the composite resin exhibits physical characteristics satisfying:
Ho× 0.4≤ H≤Ho
where H is a maximum height when a first plate-like test piece is not broken when a weight of 250 g is dropped from a certain height after the first plate-like test piece is kept at −10° C. for three hours, the first plate-like test piece being made of the composite resin with a thickness of 1 to 2 mm; and Ho is a maximum height when a second plate-like test piece is not broken when a weight of 250 g is dropped from a certain height after the second plate-like test piece is kept at −10° C. for three hours, the second plate-like test piece being only made of the base resin with the same thickness as the first plate-like test piece, and
So× 0.4≤ S≤So
where S is a Charpy impact strength specified in JIS K 7111 of the molded article of the composite resin, and So is a Charpy impact strength specified in JIS K 7111 of the molded article only made of the base resin.
2 . A molded article of a composite resin containing fibers, the composite resin containing a fibrous filler in base resin, wherein the fibrous filler has a non-fibrillated part that is not fibrillated and a fibrillated part on each end of the fibrous filler in a fiber length direction.
3 . The molded article of the composite resin containing fibers according to claim 2 , wherein the fibrous filler has a median fiber diameter of 0.1 to 2 μm on the fibrillated part, and
the fibrous filler has a median fiber diameter of 5 to 30 μm on the non-fibrillated part.
4 . The molded article of the composite resin containing fibers according to claim 1 , wherein the fibrous filler is natural fibers of cellulose.
5 . The molded article of the composite resin containing fibers according to claim 1 , wherein the base resin is an olefin resin.
6 . A molded article of a composite resin containing fibers, the composite resin containing a fibrous filler in base resin, wherein the fibrous filler has a non-fibrillated part that is not fibrillated at the center of the fiber in a fiber length direction and a fibrillated part on each end of the fibrous filler in the fiber length direction,
the fibrous filler has a median fiber diameter of 0.1 to 2 μm on the fibrillated part and has a median fiber diameter of 5 to 30 μm on the non-fibrillated part,
the fibrillated part prevents cracking caused by connection of a plurality of crazing defects occurring when an impact force is applied to the molded article in a plane direction, and
the non-fibrillated part that is not fibrillated prevents cracking defects occurring when an impact force is applied to the molded article in one direction as in a Charpy impact test.