Abstract: A foamed thermoplastic resin sheet has a foaming ratio of not less than 2.5, and cells, existing in an interior part which extends inward from a depth of 20 percent a whole thickness of the sheet from the front and rear surfaces thereof respectively in a thickness direction thereof and from 15 percent a width of the sheet from both side edges respectively, satisfy the following expressions (1) and (2): 0.5≦D/C≦0.9  (1) 0.5≦E/C≦0.9  (2) where C represents a mean cell diameter in the thickness direction of the foamed thermoplastic resin sheet, D represents a mean cell diameter in an extrusion direction (MD) of the same, and E represents a mean cell diameter in the width direction (TD) of the same. The foamed thermoplastic resin sheet thus arranged has a high foaming ratio, and is formed thick.

Abstract: A multilayer polyolefin foamed sheet comprises a foamed layer and a non-foamed layer. The foamed layer is composed of polyolefin and the non-foamed layer is composed of one of the polyolefins, a polypropylene with a long-chain branch and a polyolefin-based adhesive resin with a long-chain branch. In another aspect, a multilayer polyolefin foamed sheet comprises a foamed sheet having at least one polyolefin foamed layer and a gas barrier resin sheet having at least one barrier resin layer laminated thereon, wherein the gas barrier resin sheet has a thickness of from 10 to 300 &mgr;m and has a thickness distribution, Tmax/Tmin, of from 1 to 1.2 in an area of at least 25 cm2.

Abstract: The present invention relates to a wood-filled thermoplastic resin composition comprising wood meal, thermoplastic resin particles and a binder solution, and a process for producing the same.

Abstract: A foamed thermoplastic resin sheet manufacturing device is provided with (i) an extruder for melting and kneading a thermoplastic resin and a foaming agent to form a melted/kneaded mixture and extruding the melted/kneaded mixture, (ii) a die which is provided at a front end of said extruder and forms the melted/kneaded mixture into a sheet-like foamy thermoplastic resin material, (iii) a vacuum chamber in which the foamy thermoplastic resin material extruded through said die expands under a reduced pressure, and (iv) a facing-wall section composed of a pair of walls of said vacuum chamber which face each other in a thickness direction of the foamy thermoplastic resin material, at least one of the walls in pair being a movable wall provided so as to move in directions in which said walls approach and separate each other. By this arrangement, foamed thermoplastic resin sheets with various thicknesses can be produced.

Abstract: A foamed thermoplastic resin sheet manufacturing device is provided with (i) an extruder for melting and kneading a thermoplastic resin and a foaming agent to form a melted/kneaded mixture and extruding the melted/kneaded mixture, (ii) a die which is provided at a front end of said extruder and forms the melted/kneaded mixture into a sheet-like foamy thermoplastic resin material, (iii) a vacuum chamber in which the foamy thermoplastic resin material extruded through said die expands under a reduced pressure, and (iv) a facing-wall section composed of a pair of walls of said vacuum chamber which face each other in a thickness direction of the foamy thermoplastic resin material, at least one of the walls in pair being a movable wall provided so as to move in directions in which said walls approach and separate each other. By this arrangement, foamed thermoplastic resin sheets with various thicknesses can be produced.

Abstract: The present invention relates to a wood-filled thermoplastic resin composition comprising wood meal, thermoplastic resin particles and a binder solution, and a process for producing the same.

Abstract: The present invention relates to a metal mold for producing a synthetic resin molded product, particularly a thermoplastic resin molded product, which is characterized by comprising: a first mold, a sliding mold that is allowed to slide over the entire outer circumferential face or on a portion of said first mold, a second mold having a parting face that is capable of contacting the face of the outer circumference of said sliding mold, and a mechanical clamping mechanism that makes the outer circumferential portion of the said sliding mold mechanically coupled to said second mold, wherein said sliding mold has a sliding direction that is the same as the opening and closing direction of the two molds, that is, the first mold and the second mold, and the sliding face between the first mold and the sliding mold is located inside the outer circumferential line, of a plane projection figure in the opening and closing direction of the metal mold, of a synthetic resin molded product which is molded by the metal mold

Abstract: A mold for compression molding a resin article, which mold consists of male and female molds, wherein, at the time of complete mold closing, the length L in a mold closing direction of a mated part formed between the outermost wall of said male mold and the innermost wall of said female mold satisfies the equation: (t1−t0+10)mm≧L≧(t1−t0)mm wherein t1 is a distance (mm) between the male and female molds when the resin melt first reaches the mating outermost edge of the male mold, and t0 is a distance (mm) in the mold closing direction between the same points on the male and female molds as those used for measuring t1 when the mold closing is complete, and the horizontal distance of a mating gap between the outermost wall surface of said male mold and the innermost wall surface of said female mold is from 0.02 to 0.1 mm, with which mold, squeeze-out of a resin melt during molding is prevented.

Abstract: A mold assembly for making a multilayer molded article comprising: a first mold; a second mold; a shut-off pin slidably received in a resin-supplying gate opened to a cavity face of the first mold; a pin-driving unit for moving the shut-off pin among an opening position, a closing position and a projecting position; a resin-supplying unit for supplying a molten thermoplastic resin from said resin-supplying gate; and a press unit for moving the molds between an open position and a closed position.

Abstract: There is provided a process for producing a multi-layer molded product having a plurality of thermoplastic resin layers. This process provides for (i) a step of supplying first and second molten thermoplastic resins each through first and second resin supplying gates which are temperature-controllable independently of each other, to between female and male molds kept in an open state with a time difference being provided between supply starts of the first and second resins, and (ii) a step of closing the female and male molds after completion of supply of the first and second resins. The process enables production of high-quality multi-layer molded products having a plurality of resin layers with good repeatability under relatively low resin supply pressure and by single mold closing. Further, high-quality multi-layer molded products can readily be produced without restrictions on materials used.

Abstract: A discharge device for discharging solids of a thermoplastic substance and fibers includes a discharge passage extending longitudinally and having an inner wall surface forming a passage opened at its lower end, a solid supply device for supplying the solids of the thermoplastic substances to a first position in the passage and a fiber supply device for supplying the fibers to a second position in the passage. A cross line on which a part of the inner wall surface extending downward from an upper one of the first position and the second position intersects a vertical plane forms an angle of 0 to 30° with respect to a vertical line, or all tangent lines for the cross line form angles from 0 to 30° with respect to a vertical line.

Abstract: A disclosed process for producing a molded article made of fiber-reinforced thermoplastic material includes providing a molding machine containing a plasticizing apparatus having an opening for receiving raw materials, an apparatus for feeding the raw materials to the plasticizing apparatus and a molding apparatus having a cavity; feeding both thermoplastic material in a solid state and reinforcing fibers with a length from about 3 mm to about 50 mm simultaneously into the plasticizing apparatus through the opening from the feeding apparatus; melting the thermoplastic material and kneading the thermoplastic material and the reinforcing fibers in the plasticizing apparatus to produce kneaded material comprising the thermoplastic material and the reinforcing fibers; supplying the kneaded material to the molding apparatus from the plasticizing apparatus; and molding the kneaded material into the molded article in the cavity is provided.

Abstract: A hollow molded article having no sink marks on its surface and having an excellent appearance is produced by filling a mold cavity with a resin being in a molten state and then ejecting at least a part of the resin by sucking through a resin-ejection opening and introducing gas through a gas-introduction opening into the resin inside of which being in a negative pressure. According to this process, the use of a high-pressure gas is not required.

Abstract: The present invention provides a polypropylene-based foamed sheet whose expansion ratio is 4 or more times characterized by expansion ratio A of the part (skin layer) up to 20% in each of the seat thickness from both surface of said polypropylene-based foamed sheet and expansion ratio B of part other than said skin layer (core layer) satisfying the following formula (1) and the like1.3.ltoreq.B/A (1)The polypropylene-based foamed sheet of the present invention is excellent in the balance of a lightweight properties and rigidity.

Abstract: A method is disclosed for making a multi-layer up molded article.

Abstract: A molded article of a fiber-reinforced thermoplastic resin which suffers less deformation and has good appearance is produced by a method which includes the steps of:supplying at least two porous fibrous sheets,supplying a resin melt of a thermoplastic resin in a space between the porous fibrous sheets, andforcing the resin melt to fill the pores of the porous sheets by resin supplying pressure and/or pressing pressure and to reach outer surfaces of the porous fibrous sheet.

Abstract: A process for producing a concrete form made of thermoplastic resin by a press-molding process by feeding a reinforcing material-containing thermoplastic resin heated to a temperature not lower than the melting temperature of the resin into the cavity between male and female halves of a die, clamping the die and cooling the die, wherein the press-molding is carried out under the conditions that the period of time from completion of feeding the melted resin to completion of clamping is not longer than 6 seconds and flow length L of the fed resin and thickness T of the molded product satisfy the formula 190.ltoreq.L/T.

Abstract: A multilayer molded article having good appearance is produced by providing a preheated fiber-reinforced resin sheet between a pair of upper and lower molds, and supplying a thermoplastic resin melt and optionally a foam sheet between the upper mold and the fiber-reinforced resin sheet. The thermoplastic resin melt is supplied through a resin supplying opening provided in the lower mold, and through a hole made in the fiber-reinforced resin sheet and the foam sheet. During the supply of the resin melt or as soon as the resin supply is finished, the molds are closed to further flow, and the resin melt is formed to produce a mu molded article made of the fiber-reinforced resin sheet, a skin layer of the thermoplastic resin and optionally the foam sheet therebetween.

Abstract: A molded article of a thermoplastic resin having good appearance is molded with a pair of molds having a conduit for supplying a resin melt in one of the molds by closing the molds till a mold cavity clearance in a closing direction reaches a specific distance, opening the molds at a specific rate while starting supply of the resin melt into the mold cavity before the clearance reaches the thickness of the finally produced article, continuing opening of the molds while supplying the resin melt till the cavity clearance becomes larger than the thickness of the finally produced article, and closing the molds at a specific rate before or when resin supply is finished to mold and cool the supplied resin melt.

Abstract: In a method for the preparation of crosslinked polyolefin foams by charging a polyolefin or its blend with other thermoplastic resins containing a crosslinking agent, foaming agent and if necessary a filler into the heated mold having a changeable cavity and, after decomposition of the crosslinking and foaming agents, retracting the moving-plate of the mold by a definite distance to increase the cavity and at the same time cooling the mold, an improvement for the preparation of the crosslinked polyolefin foams having excellent appearance and dimensional stability, comprising using a mold of which the moving-plate is constructed with a body and a sliding-piece, the body holding the piece slidably whereby the sliding-piece is left behind owing to sliding between the two even on rapid retraction of the body and then retracts at the rate corresponding to the foaming pressure of the resin, in other words, at a self-controllable rate and the mold for the preparation thereof.