Jsp Corporation

Katsunori Hisamatsu

Keiichi Hashimoto

Atsuo Takayama

Shogo Iwasaki

A vehicle seat core material includes a molded article that includes thermoplastic resin expanded beads. The molded article has a substantially rectangular shape in a top view, and has a front side and a rear side opposite the front side. The molded article has an average density (Z) of 20 kg/mto 50 kg/m. The molded article includes, on the rear side of the molded article, a rear thin portion having a thickness of 10 mm to 40 mm, the thickness of the rear thin portion being smaller than an average thickness of the molded article. A ratio (Y/Z) of a density (Y) of the rear thin portion to the average density (Z) of the molded article is 1.05 to 3. The rear thin portion of the molded article has a fusion rate of 70% or more.

Vehicle seat core material

A seat core material having reduced deformation, extremely excellent dimensional accuracy, sense of unity, and strength is thus provided. The frame member and the foamed particle molding are integrated in the seat core material.

Seat core material

A seat core material of the present invention is a seat core material for vehicle including a thermoplastic resin expanded bead article and a frame member embedded in a peripheral edge portion of the expanded bead article. The frame member includes a front frame part, a rear frame part, and two side frame parts interconnecting the front frame part and the rear frame part. Slits crossing the two side frame parts are formed along a longitudinal direction with continuous parts left intact outside the side frame parts on both ends of the expanded bead article. The slit penetrates or does not penetrate the expanded bead article in a thickness direction. The continuous parts are formed in a curved shape or a bent shape.

A seat core material of the present invention is a seat core material for vehicle including: a thermoplastic resin expanded bead article; and a frame member embedded in a peripheral edge portion of the expanded bead article. The expanded bead article has two or more lightening parts in an area from a center portion as seen in a front-back direction to a rear side. A through or non-through slit is provided in a continuous part between the lightening parts or an area in front of the continuous part over a distance of 100 mm or less along a vehicle-width direction of the expanded bead article. The slit is closed at both longitudinal ends.

There is provided a vehicle seat core member that is superior in terms of a dimensional accuracy as well as integrity of a thermoplastic resin expanded beads molded body and a frame member. A vehicle seat core member () is formed as an integrally molded article of a thermoplastic resin expanded beads molded body () and a frame member (), the thermoplastic resin expanded beads molded body () is formed of thermoplastic resin expanded beads () having through holes (), and a porosity of the thermoplastic resin expanded beads molded body () is 10 vol % or more and 40 vol % or less.

Vehicle seat core member

Provided is a core material of a seat cushion for a vehicle. The core material includes: a thermoplastic resin expanded beads molded articlethat has a substantially rectangular shape in a top view, the rectangular shape having a long side and a short side; and an annular reinforcing memberthat is insert-molded in the peripheral edge part of the expanded beads molded article. A missing partis formed in the expanded beads molded article, the missing part passing through in the thickness direction. A slitis formed in at least one corner of the lightening part, the slit being oriented outward from the expanded beads molded article from the vicinity of the corner part.

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Tochigi, Japan

Katsunori Hisamatsu