Blow molded article with surface skin and method for production thereof
Provided are a blow molded article with a surface skin, which allows the formation of a blow molded article having a desired expansion ratio and retains a required expansion ratio from the time of extruding and is free from the generation of a sink mark or a warp in a portion where the surface wall and the back wall thereof has been welded and allows the production of a blow molded article with a lightweight and highly rigid surface skin; and a method for producing the blow molded article. A panel ( 1 ) with a surface skin, which is a blow molded article with a surface skin, has a body ( 5 ) in the form of a plate having a surface wall ( 2 ) and a back wall ( 3 ), both comprising a thermoplastic plastic, and a surface skin material ( 6 ) which is integrally pasted on the surface wall ( 2 ). The body ( 5 ) in the form of a plate is in an expanded state and comprises cells having an average particle diameter of 300 μm or less.
1. A method for producing a blow molded, single layered structure integrally welded two walls, thermoplastic article with a surface skin of non-woven material disposed on at least one wall of said article, said method comprising:
arranging a surface skin material between split molds;
providing within said split molds a cylindrical parison or plurality of resin sheets composed of a mixture of having different melt flow rates at 230° C. and a foaming agent;
clamping said split molds;
extruding said cylindrical parison or plurality of resin sheets at a temperature not less than 185° C. such that said cylindrical parison or resin sheets are in a molten state and come into contact with the surface skin material is integrally fixed to least one wall of said blow molded, plate shaped, thermoplastic article, such that said mixture polyolefin resins penetrates into gaps between fibers of said surface skin material and anchors said fibers to said polyolefin resin thereby integrally welding an entire surface of said at least one wall to said non-woven material,
extending a bubble cell formed by said foaming agent within the mold in the cylindrical parison or the resin sheet, such that said bubble cell is flat along a cavity plane of the mold, and gives a section approximately ellipse form, producing a front wall and a back wall having an integrated single layered structure, in a foamed state, comprising bubble cells with an average particle diameter not more than 300 μm is molded; and
allowing walls of said cylindrical parison or said resin sheets to integrally weld at an interior surface thereby forming a unitary foamed article.
2. A method for producing a blow molded, single layered structure integrally welded two walls, thermoplastic article with a surface skin of non-woven material disposed on at least one wall of said article, said method comprising:
arranging a surface skin material having a resin layer between split molds;
providing within said split molds a cylindrical parison or plurality of resin sheets composed of a mixture of resins having different melt flow rates at 230° C. and a foaming agent, such that said resin layer faces said parison or said plurality of resin sheets;
clamping said split molds;
extruding said cylindrical parison or plurality of resin sheets at a temperature not less than 185° C. such that said cylindrical parison or resin sheets are in a molten state and come into contact with the surface skin material is integrally fixed to least one wall of said blow molded, plate shaped, thermoplastic article, such that said mixture polyolefin resins penetrates into gaps between fibers of said surface skin material and anchors said fibers to said polyolefin resin thereby integrally welding an entire surface of said at least one wall to said non-woven material,
extending a bubble cell formed by said foaming agent within the mold in the cylindrical parison or the resin sheet, such that said bubble cell is flat along a cavity plane of the mold, and gives a section approximately ellipse form, producing a front wall and a back wall having an integrated single layered structure, in a foamed state, comprising bubble cells with an average particle diameter not more than 300 μm is molded; and
allowing walls of said cylindrical parison or said resin sheets to integrally weld at an interior surface thereby forming a unitary foamed article, such that a layer of resin is disposed between said unitary foamed article and said surface skin.
3. The method according to claim 1 wherein said temperature is not less than 190° C.
4. The method according to claim 2 wherein said temperature is not less than 190° C.