摘要:
Described herein are strength characteristics and biodegradation of articles produced using one or more petrochemical-based polymers and one or more carbohydrate-based polymers. A compatibilizer can optionally be included in the article. In some cases, the article can include a film or bag.
摘要:
This invention is to improve the reaction efficiency of a peroxide introduced into a cylinder compared with conventional art. In the peroxide reaction method and peroxide reaction device using an extruder according to this invention, in which a peroxide and a raw material such as a synthetic resin, a natural resin, and an elastomer are introduced into a cylinder of the extruder, wherein the raw material and the peroxide are reacted with each other in the cylinder, the raw material is introduced from a raw material supply hopper, the peroxide is introduced from a downstream side of the raw material supply hopper, and the temperature of the raw material in a peroxide introduction portion is adjusted to a temperature lower than the one-minute half-life temperature of the peroxide.
摘要:
An extruder screw includes a screw main body, conveyance portions, barrier portions, and paths. The raw materials, the conveyance of which is limited by the barrier portions, flow in from the entrance. The raw materials flowing in from the entrance flow through the paths in an opposite direction to a conveyance direction of the conveyance portions. The exit is opened in the outer circumferential surface of the screw main body at a position on an upstream side in the conveyance direction in the conveyance portions in which the entrance is opened.
摘要:
The invention relates to an extruder (1) for processing relatively small quantities of pharmaceutical and/or biomedical materials, which extruder (1) comprises an extruder frame (7), a barrel (9, 10), a pair of extruder screws (3), and a drive for rotating the extruder screws (3), wherein the barrel (9, 10) is formed by a pair of separable housing blocks that are positioned in a closed position against each other during processing, each housing block having a barrel liner (13, 15), wherein in the closed position of the pair of separable housing blocks the barrel liners define an interior volume, a feed opening (30), a discharge opening (45) and an opening (31a, 33a) for receiving the pair of extruder screws (3) in the interior volume.
摘要:
The molded article includes a resin composition with a single shaft extruder, in which the resin composition is generated by melting and mixing a raw mixture, the raw mixture being obtained by blending 40-90 parts by mass of the polyolefin (A), 3-30 parts by mass of the metaxylylene group-containing polyamide (B), and 3-50 parts by mass of the modified polyolefin (C). In the single shaft extruder, the ratio of the length of the feeding part to the screw effective length is 0.40-0.55, the ratio of the length of the compressing part to the screw effective length is 0.10-0.30, the ratio of the length of the measuring part to the screw effective length is 0.10-0.40, the upper limit of the temperature of the feeding part falls within the range of +20° C. from the melting point of the metaxylylene group-containing polyamide or less, and the temperatures of the compressing part and the measuring part fall within the range of −30° C. to +20° C. from the melting point of the metaxylylene group-containing polyamide, and the shear rate is 14/second or more.
摘要:
A composite pipe and a manufacturing method for the same are disclosed. The composite pipe for replacing carbon steel pipes for ordinary piping or copper pipes for air-conditioner includes: a first resin layer (1) formed by cross-linking a resin and giving a polar group thereto; a first bonding layer (2) for inducing bonding by sharing radical groups of the first resin layer and a metal layer; the metal layer (3); a second bonding layer (4) for inducing bonding by sharing radical groups of the metal layer; and a second resin layer (5) formed by cross-linking a resin and giving a polar group thereto, thereby integrating the layers chemically and physically.
摘要:
A system and method for expanding a thermoplastic material includes extruding a melted thermoplastic material through an extruder, continuously introducing a solid carbon dioxide material under pressure into the melted thermoplastic material in the extruder, foaming the melted thermoplastic material by changing the solid carbon dioxide material to gaseous carbon dioxide and allowing the gaseous carbon dioxide to mechanically mix with and foam the melted thermoplastic material, and collecting the foamed, extruded thermoplastic material. A foamed, extruded thermoplastic material is produced by the method and system.
摘要:
An apparatus for producing a dope includes an extrusion machine. A cooling medium flows in a jacket in periphery of a cylinder so as to perform the cooling at null45null C. (upstream side) and null70null C. (downstream side). A screw has first-third portions. The diameter is smaller in the first portion than the third portion, and becomes larger in the second portion toward the third portion. A mixture of TAC and methyl acetate is supplied into a cylinder, whose rotation feeds the mixture from the first to the second portion. Since the space between the second portion and the cylinder becomes narrower in the downstream side, the mixture is compressed and cooled at the same time, to easily dissolve the polymer to the solvent. The dope is obtained and made uniform by the third portion. Thereafter, the dope is fed to the cooler for progress of the dissolution.
摘要:
In a method of fabricating plastic strips and an extruder structure therefor, a plastic extruder is used to melt plastic or acrylic raw materials and to extrude the same in the form of soft plastic strips, which can be bent by hand to form a shape by following a pattern that is a line or a recess formed in a mold plate. The plastic strip is allowed to cool to form a product with the desired shape.
摘要:
A viscoelastic extrusion process (VEEP) for biopolymers such as polylactic acid is provided. The VEEP process removes many processing and performance limitations of PLA as well as creates performance sufficient to produce durable “nonbiodegradable” products as a direct replacement for PVC and other petrochemical profile and sheet extrusion applications. The VEEP process also retains a high degree of crystallinity within the PLA for increasing toughness and to lower its biodegradability. The invention also includes an integral process wherein rheology is highly modified to allow profile extrusion and higher melt strength wherein processing is lower than the melting point of the primary biopolymer and below the browning points of the natural fibers in the biopolymers viscoelastic state.