Provided is a method for producing a shaping material that contains a cyclic olefin polymer and has a low content of a volatile impurity. This method for producing a shaping material is a method which includes passing a raw-material resin in a molten state through an extruder to produce a shaping material, and in which the extruder is equipped with a cylinder, a screw housed within the cylinder, a resin introduction port for introducing the raw-material resin into the cylinder, a resin discharge port for discharging the molten resin from the cylinder, a fluid injection port for injecting carbon dioxide or water into the cylinder between the resin introduction port and the resin discharge port, and a fluid discharge port for removing fluid in the cylinder by suction downstream of the fluid injection port and between the resin introduction port and the resin discharge port.

An extruder is disclosed including: a barrel; and a screw provided with a helical groove; wherein the screw comprises a dewatering portion comprising a first portion, and a second portion at a location downstream from the first portion; wherein, at the dewatering portion, clearance between the groove and the barrel decreases as one proceeds downstream; and wherein clearance reduction ratio at the first portion is greater than clearance reduction ratio at the second portion.

A rubbery polymer extrusion dryer includes: a cylinder; a liner provided on an inner peripheral surface of the cylinder; a screw rotatably arranged in the liner; wherein the rubbery polymer extrusion dryer conveys a rubbery polymer by the screw rotating in the liner, wherein a plurality of grooves extending in a conveying direction of the rubbery polymer are formed on an inner surface of the liner, and wherein widths of the grooves are 0.1 mm or more and 2 mm or less.

Porous sheet product and methods of making and using the same. In one embodiment, the porous sheet product may be made by a process that includes providing an extrusion mixture, the extrusion mixture including a polymeric binder, a swelling agent, a compatibilizing agent, and a superabsorbent polymer, the superabsorbent polymer being in particle form. The superabsorbent polymer may be wet-milled such that its particle size before and after milling is reduced by a ratio of at least 5:1. The extrusion mixture may be melt-extruded to form a sheet material in film form. At least a portion of the swelling and compatibilizing agents may be removed. The porous sheet product is preferably liquid permeable and may be used, for example, as a battery separator, as a food packaging material, as a diffusion barrier and disposable garments.

The invention is directed to a process for producing a ABS composition comprising 30-80 wt.-% of copolymer matrix A, 19.99-60 wt.-% of ABS-copolymer B, 0-40 wt.-% of polymer C and 0.01-20 wt.-% of additives D, having the steps: a) mixing the components A, B and D and optionally C, by using an extruder comprising: a first feeding zone FZ1, a mechanical dewatering zone DZ, in which component B is mechanically dewatered, and wherein: the mechanical dewatering zone DZ comprises at least one dewatering aperture, in particular for liquid water, wherein the mechanical dewatering DZ zone comprises one or more elements made of a stainless steel material; in a second feeding zone FZ2, at least part of component A and optionally part of component D are fed, preferably in melt and/or solid form, to the extruder, in a degassing zone DG component A and/or component B are degassed, and b) removing the ABS molding composition from a discharge zone CZ of the extruder.

A method for preparation of decontaminated natural rubber is provided. The method is characterized in that it comprises a decontamination step in which wet natural rubber coagulum passes through a system comprising an extruder and a filter installed at the extruder outlet, the extruder comprising an axially symmetrical grooved sheath comprising in its thickness grooves opening on the inner surface of the sheath.

A system for extrusion of material, for example chopped waste plastic, comprises a treatment device (101) for extruding the material and a feeder device (102) comprising a screw conveyor (103) for supplying the material to the treatment device. A screw element (104) of the screw conveyor has: a) a conical profile so that a diameter of the screw element decreases in a moving direction of the material and/or b) a thread-pitch decreasing in the moving direction of the material and/or c) an axial thickness of a screw thread crest increasing in the moving direction. The conical profile of the screw element and/or the thread-pitch decreasing in the moving direction and/or the axial thickness of the screw thread crest increasing in the moving direction improve the ability of the screw conveyor to compact the material and thereby to supply a sufficiently uniform material flow to the treatment device.

A process for preparing a thermoplastic polymer composition or a thermoplastic polymer blend, comprising: from 20 to 80% by weight of at least one water-moist elastomer component A containing up to 40%, preferably up to 30% by weight of residual water, from 20 to 80% by weight of at least one thermoplastic polymer B, from 0 to 40% by weight of at least one further polymer C, and from 0 to 60% by weight of additive(s) D, by mixing the elastomer component A with the thermoplastic polymer B and, if present, the further polymer C and, if present, the additive(s) D in an extruder, comprising the steps of precipitating the elastomer component A, and mechanical dewatering of the elastomer component A leads to improved salt-free products.

A foamable composition comprising at least one cellulose acetate, a plasticizer, a nucleating agent, either a chemical blowing agent or a physical blowing agent, and natural fibers is disclosed. The foamable composition is melt-processable, thermoformable, and biodegradable. The composition is formed into foamed articles that are biodegradable.

A foamable composition comprising at least one cellulose acetate, a plasticizer, a nucleating agent, either a chemical blowing agent or a physical blowing agent, and natural fibers is disclosed. The foamable composition is melt-processable, thermoformable, and biodegradable. The composition is formed into foamed articles that are biodegradable.