摘要:
A screening apparatus for molten plastic material flowing from an extruder comprising a housing mounted on the extruder and having a feed channel for flow of the plastic material therefrom and a slide member mounted for slidable movement in the housing with a clearance therebetween. The slide member contains replaceable screen elements adapted for being positioned in the path of flow of the plastic material flowing from the extruder to effect screening thereof. In order to seal the clearance between the slide member and the housing to prevent outflow of plastic material therefrom, a flange is mounted on the housing to surround the slide member with a gap therebetween. This permits normal free-sliding movement of the slide member in the housing. The flange contains cooling channels to permit flow of a coolant to cool plastic material in the gap and solidify the plastic material to prevent outflow of plastic material from the gap. The flange is mounted on the housing by thermal insulation which prevents cooling of the housing upon cooling of the flange.
摘要:
An improved process for adding magnesium oxide to polymeric compositions based on vinylidene chloride copolymers. The improvement comprises forming a pre-mixture of the magnesium oxide and an ethylene-vinylalkanoate dispersing medium or agent and thereafter blending an amount of the pre-mixture with the vinylidene chloride copolymer composition.
摘要:
Particulate plastic materials are moved from a supply hopper through a former and formed into a product, the product is cut, and the scrap from the cut product is moved from the cutting area back to the supply hopper by an open conduit pneumatic induction system. The induction system includes a blower and an approximately L-shaped induction conduit with its first leg receiving the exhaust of the blower and its second leg including a Venturi throat. An induction opening is formed in the induction conduit and a scrap feed nozzle is telescopically mounted in the induction opening and has its discharge movably supported in the Venturi throat. The scrap feed nozzle is adjustable with respect to the Venturi throat so as to adjust the system to the most energy efficient position for required operating conditions.
摘要:
An apparatus for extruding a thermoplastic material comprising an extruder and wherein said extruder comprises a heat dam assembly including an inner thin walled sleeve fixed at one end to the exterior periphery of a barrel section and extending therefrom in closely spaced surrounding relation to a position adjacent a discharge end of a screw section and an annularly finned member disposed in closely spaced surrounding relation to a thin walled sleeve fixedly connected between the exterior periphery of the barrel section and a nozzle assembly.
摘要:
A process for producing articles of ultra high molecular weight high density polyethylene is disclosed which avoids long heating and cooling cycles, and compacting pressures in the order of 3,000 to 4,000 lbs/sq. inch. The resin is intensively mixed and thermokinetically heated in an enclosed container with a plurality of blades attached to arms rotating about an axis with a blade tip speed of at least 18 m/sec. until the resin reaches a desired discharge temperature of at least 135.degree. C. After being discharged from the mixing step, the ultra high molecular weight resin is formed into the desired shape within a time such that degradation does not occur.
摘要:
An improved screw-type extruder intended to increase the output obtainable from a machine of certain dimensions while maintaining a satisfactory quality of the material extruded. This result is obtained by providing in the homogenization zone a thread crossed by a multitude of narrow passages, and in the feed zone means for overfeeding the plasticizing zone. These overfeeding means may, for example, consist in providing in this zone a cylinder grooved longitudinally or spirally or a double-screw section producing a forced pushing of the material toward the plasticizing zone.
摘要:
A method and apparatus for forming a proteinaceous mass into a fibrous and layered structure, including imparting a gross fibrous structure to the mass by passing the mass through a helical conveyor and layering the fibrous structure by extruding the same through a slot and changing the direction of movement of the mass as it emerges from the slot into an opening, the compression and extrusion being carried out at elevated temperature to heat set the mass.
摘要:
Process for producing a partially foamed thermoplastic polymer product in a single screw extruder by dividing an initial melt stream of the polymer into separate partial melt streams conveyed individually by the extruder to a shaping or forming die, uniformly mixing a foaming agent with at least one but not all of the separate and individually conveyed partial melt streams, and then rejoining all of said melt streams in the die in abutting core and shell layers with foaming of at least one but not all of said layers.
摘要:
Apparatus for automatically feeding a number of extruders from a number of supply containers, wherein a supply nozzle for an extruder can be connected with a supply container, such that each supply container is connected with an individual supply container discharge nozzle and a supply container cut-off member, while each extruder is connected with an individual extruder supply nozzle. An automatic regulator is provided for controlling the members which connect an extruder supply nozzle with a supply container discharge nozzle and for opening the cut-off member of the supply container associated with the relating supply container discharge nozzle.
摘要:
A worm extruder in which a worm rotates in a cylinder and advances material therein from an inlet to a discharge. The movement of the material in the cylinder is under the control of one or more flow restricting means in the cylinder and surrounding the extrusion worm.