Jsp Corporation

Nissan Motor Company Limited

Keiichi Hashimoto

Atsuo Takayama

Hidehiro Sasaki

Akinobu Hira

Katsunori Hisamatsu

Hisao Tokoro

Motoaki Ueguri

Mitsuru Shinohara

Tomoo Tokiwa

Kazuya Ogiyama

Hiroki Yanagisawa

Shogo Iwasaki

Toshiyuki Hariya

Yasuhiko Yoneyama

Masanori c/o Intellectual Property Department Of Taniguchi

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 method for producing a seat core material that has a foamed molded substrate and a frame member embedded in a periphery thereof, which includes, as step (a), heating thermoplastic resin expanded beads in a mold cavity, in which the frame member has been disposed, to fusion-bond the expanded beads to each other and to obtain the foamed molded substrate with the frame member being embedded in the periphery thereof; and, as step (b), simultaneously with step (a) or after step (a), forming a void cavity S, S' in the foamed molded substrate at a position along and adjacent to the frame member. The void cavity S, S&#x2032; has a size and shape that allows a relative displacement between the frame member and the foamed molded substrate when the foamed molded substrate shrinks after step (b).

Method for producing seat core material, and 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 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.

Core material of vehicular seat cushion

A composite seat core material is configured from: a base portion that is formed by fusing thermoplastic resin foamed particles having no through-hole to each other; and a connecting portion that is provided on the upper side of the base portion, and is formed by fusing foamed particles having through-holes to each other, the connecting portion having interconnected void spaces that communicates with the outside. With the outer surface of the connection portion partially exposed at the top surface of the composite seat core material, the base portion and the connecting portion are fixed and integrated with each other. A seat member is formed by laminating a polyurethane foam pad on the top surface of the composite seat core material.

Composite seat core material and vehicular seat element using the composite seat core material

A seat core member of a seat portion provided with the seat core member made of a hard synthetic resin foam and a cushion layer made of a soft synthetic resin foam and covering the seat core member is provided, and the seat core member includes a plurality of ridges extending in a rising direction of the seat core member in a rising portion of the seat core member being in contact with the cushion layer and opposing to calves of a body is formed.

Seat core member, seat portion, and seat

A method for manufacturing including securing attachments disposed near both ends in the seat core member front portion made of a molded article of expanded beads, the securing attachments being connected by an embedded connecting member extending in the seat core member longitudinal direction. The securing attachment includes a base embedded in the molded article of expanded beads, an upright frame joined to the base to extend out of the molded article of expanded beads, and a securing portion extending from the upright frame to project away from the molded article of expanded beads. The method includes creating, during or after molding the molded article of expanded beads, a space or notch in an outer side of the securing attachment upright frame of the molded article of expanded beads in the seat core member longitudinal direction, the notch extending toward an outer side in the seat core member longitudinal direction.

Method for manufacturing vehicle seat core member and vehicle seat core member

A process of producing a foamed molding, wherein expanded, substantially non-crosslinked polypropylene-based resin beads are heated in a mold to fuse-bond the beads together into a unitary body. Each of the expanded beads has been surface-modified with an organic peroxide.

Process of producing foamed molding from expanded polypropylene resin beads and process of producing expanded polypropylene resin beads

Process of producing foamed molding from expanded polypropylene resin beads

A process for the production of expanded beads, including kneading a base resin containing a polypropylene resin and having a tensile modulus of at least 1,200 MPa together with a mixture of a coloring agent and a thermoplastic polymer having a tensile modulus lower than that of the base resin to form a kneaded mixture including a matrix of the base resin and a multiplicity of domains dispersed in the matrix and each containing the thermoplastic polymer and the coloring agent. The kneaded mixture is formed into resin particles, then treated with an organic peroxide to modify surfaces of the resin particles therewith. Foaming and expanding of the surface-modified resin particles gives expanded beads having an inside region surrounded by a surface region. The heat of fusion of a high temperature peak of the surface region is lower than that of the inside region.

Expanded polypropylene resin beads and process for the production thereof

A composite foamed polypropylene resin molding including a plurality of sections which are fuse-bonded to each other, at least two of which differ from each other in color, apparent density, composition and/or mechanical strengths, each of which is formed from expanded polypropylene resin beads, and each of which shows a high temperature endothermic peak in a DSC curve thereof. At least one of the sections satisfies conditions (d) to (f) at the same time: (d) to be formed from specific expanded polypropylene resin beads of a base resin having a tensile modulus of at least 1,200 MPa, (e) to have an apparent density Dof 10&#x2013;500 g/L, and (f) to have such a high temperature endothermic peak with a calorific of EJ/g, wherein Dand Ehave the relationship 20&#x2212;0.020&#xd7;D&#x2266;E&#x2266;65&#x2212;0.100&#xd7;DThe composite molding may be prepared by filling expanded polypropylene resin beads in each of a plurality of contiguous spaces defined in a mold cavity and heating the expanded beads to fuse-bond respective expanded beads together into a unitary body. At least one of the spaces is filled with the specific expanded polypropylene resin beads.

Composite foamed polypropylene resin molding and method of producing same

Expanded, substantially non-crosslinked polypropylene resin beads capable of producing a high rigidity foamed molding at a relatively low temperature. The beads are produced by a process including a step of dispersing substantially non-crosslinked polypropylene resin particles in a dispersing medium containing an organic peroxide to obtain a dispersion, a step of heating the dispersion to decompose the organic peroxide and to modify the surface of the surface-modified polypropylene resin particles, and a step of expanding the non-crosslinked, surface-modified polypropylene resin particles using a blowing agent.

Growing community of inventors

Utsunomiya, Japan

Keiichi Hashimoto