A plasticizer includes a drive motor, a flat screw that has a groove forming surface where a groove is formed and is rotated by the drive motor, a barrel which has a groove facing surface that faces the groove forming surface and in which a communication hole is formed, and a heater that heats resin pellets supplied to the space between the flat screw and the barrel, and at least one of the flat screw and the barrel is at least partially formed of a transparent member, and the resin pellets between the flat screw and the barrel is visible through the transparent member.

The material plasticizing device includes a rotor having a material introduction portion open on an outer peripheral side surface, and a groove forming surface on which a scroll groove kneading a material introduced from the material introduction portion is formed; a case that surrounds an outer periphery of the groove forming surface; a facing portion having a facing surface that faces the groove forming surface, a heater that heats the material in the scroll groove, and a communication hole through which the material plasticized by a heat of the heater flows; and a material supply source that stores the material, in which a coupling pipeline is formed in the case, a material supply path is formed by the case and the outer peripheral side surface of the rotor, and the material flows into the material introduction portion through the coupling pipeline and the material supply path.

The material plasticizing device includes a rotor having a material introduction portion open on an outer peripheral side surface, and a groove forming surface on which a scroll groove kneading a material introduced from the material introduction portion is formed; a case that surrounds an outer periphery of the groove forming surface; a facing portion having a facing surface that faces the groove forming surface, a heater that heats the material in the scroll groove, and a communication hole through which the material plasticized by a heat of the heater flows; and a material supply source that stores the material, in which a coupling pipeline is formed in the case, a material supply path is formed by the case and the outer peripheral side surface of the rotor, and the material flows into the material introduction portion through the coupling pipeline and the material supply path.

A rigid vinyl chloride injection screw which kneads and injects rigid vinyl chloride includes a flight and a groove. L/D is set to be 19.1 where L is an effective screw length and D is a diameter of the injection screw. tf/tm is set to be 2.5 where tf is the width of the flight at a supply portion and tm is the width of the flight at a measure portion. hf/hm is set to be 2.1 where hf is the depth of the groove at the supply portion and hm is the depth of the groove at the measure portion. A compression ratio that is calculated from ((Ptf)hf)/((Ptm)hm) is set to be 1.74 where P is a pitch of the injection screw.

A rigid vinyl chloride injection screw which kneads and injects rigid vinyl chloride includes a flight and a groove. L/D is set to be 19.1 where L is an effective screw length and D is a diameter of the injection screw. tf/tm is set to be 2.5 where tf is the width of the flight at a supply portion and tm is the width of the flight at a measure portion. hf/hm is set to be 2.1 where hf is the depth of the groove at the supply portion and hm is the depth of the groove at the measure portion. A compression ratio that is calculated from ((Ptf)hf)/((Ptm)hm) is set to be 1.74 where P is a pitch of the injection screw.

An injection molding device includes a housing having a door, an injection molding machine, a detection section, and a control section. The control section controls voltage applied to the mold clamping motor, and performs mold-clamping and mold-opening of the upper mold and the lower mold by either moving the injection unit and the upper mold along the vertical direction or by moving the lower mold along the vertical direction. The mold clamping device further includes a first brake section that, when application of voltage to the mold clamping motor is stopped, regulates movement of the injection unit and the upper mold in the vertical direction or movement of the lower mold in the vertical direction. When the detection section detects that the door is open or detects intrusion of foreign matter, the control section stops application of voltage to the mold clamping motor.

An injection molding device includes a housing having a door, an injection molding machine, a detection section, and a control section. The control section controls voltage applied to the mold clamping motor, and performs mold-clamping and mold-opening of the upper mold and the lower mold by either moving the injection unit and the upper mold along the vertical direction or by moving the lower mold along the vertical direction. The mold clamping device further includes a first brake section that, when application of voltage to the mold clamping motor is stopped, regulates movement of the injection unit and the upper mold in the vertical direction or movement of the lower mold in the vertical direction. When the detection section detects that the door is open or detects intrusion of foreign matter, the control section stops application of voltage to the mold clamping motor.

A method for producing a foam-molded product uses a producing apparatus including a plasticizing cylinder. The plasticizing cylinder has a plasticization zone, a starvation zone, and an introducing port which is formed in the plasticizing cylinder and via which a physical foaming agent is introduced into the starvation zone. The method includes: plasticizing and melting a thermoplastic resin into a molten resin in the plasticization zone; introducing a pressurized fluid containing the physical foaming agent having a fixed pressure into the starvation zone; allowing the molten resin to be in the starved state in the starvation zone; bringing the molten resin in the starved state into contact with the pressurized fluid having the fixed pressure in the starvation zone; and molding the molten resin into the foam-molded product. At least one pressure boosting part is provided in the starvation zone.

A method for producing a foam-molded product uses a producing apparatus including a plasticizing cylinder. The plasticizing cylinder has a plasticization zone, a starvation zone, and an introducing port which is formed in the plasticizing cylinder and via which a physical foaming agent is introduced into the starvation zone. The method includes: plasticizing and melting a thermoplastic resin into a molten resin in the plasticization zone; introducing a pressurized fluid containing the physical foaming agent having a fixed pressure into the starvation zone; allowing the molten resin to be in the starved state in the starvation zone; bringing the molten resin in the starved state into contact with the pressurized fluid having the fixed pressure in the starvation zone; and molding the molten resin into the foam-molded product. At least one pressure boosting part is provided in the starvation zone.

Injection molded articles and methods for making them from bio-based materials are described. More specifically, injection molded articles and methods for making them from bio-based materials that behave like high-molecular-weight thermosets such as lignin or protein-based materials including corn gluten meal, corn gluten feed, distillers dried grains with solubles, wet distillers grains, modified wet distillers grains, canola meal, wheat gluten, barley, cottonseed meal, sunflower meal, linseed meal, soy, rapeseed, sorghum proteins, maize, rice proteins, potato proteins, cassava proteins, sweet potato proteins, yam proteins, plantain proteins, keratin, or collagen are described.