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Extruder twin screw

FIG. 18-50 Intermeshing corotating twin screw extruder (a) drive motor, (h) gearbox, (c) feed port, (d) barrel, (e) assembled rotors, (f) vent, (g) barrel valve, (h) kneading paddles, ( ) conveying screws, (/) splined shafts, (k) blister rings, (APV Chemical Machinery, Inc.)... [Pg.1649]

The throughput rate of intermeshing twin-screw extruders (Fig. 18-56) and the Farrel continuous mixer (Fig. 18-51) is scaled up with diameter to about the 2.6 power. [Pg.1652]

Twin-screw extruders now dominate the extrusion field, particularly because of their positive pumping action which is so important with PVC in powder form. [Pg.349]

Comparison of single-screw, co-rotating and counter-rotating twin-screw extruders... [Pg.263]

The following table compares the single screw extruder with the main types of twin screw extruders. [Pg.264]

Several commercial products of PVC/TPU blends are available. The BF Goodrich Chemical Group has a PVC/ TPU blend based on their Estane series TPUs. For example, their Estane 54620, a polyester-based TPU with a °ShA 85 hardness, shows excellent compatibility with flexible PVC. The blends are produced by mixing PVC, TPU, plasticizer, stabilizer, and lubricant in a twin-screw extruder. These polymeric blends show intermediate mechanical properties between PVC and TPU. [Pg.143]

A twin-screw extruder fitted with a stuffer box. The twin-screw extruder continues to blend the compound as it passes through although with the dryer. [Pg.454]

In another case where the twin-screw extruder was used, the rubber and plastic were melt mixed with all ingredients in a similar manner as described in blend compositions for static vulcanizations. The product was then dumped, cooled, and granulated. The premixed granules were then fed into a twin-screw extruder where a very narrow temperature profile was maintained with a relative high compression (2 1), and the screw speed was adjusted depending on the final torque and the flow behavior of the extruded stock. The stock was cured by shear force and temperature enforced by the twin-screw extruder. The dynamically crosslinked blend was taken out in the form of a strip or solid rod to determine the... [Pg.467]

During 1989-1990, the Research Institute for Petrochemistry, Czechoslovakia developed extrudable PVC-wood (25 wt.%) composites using a twin-screw extruder, which produce 442 Ib/h and about 0.33 million Ib/year hardboards with approximately 0.25-0.85 cm ( /lo- /s in) thickness and 101.6 cm (40 in) wide (D. Maldas, personal communication, 1992.)... [Pg.583]

Prior to blending, the LCP was dried at 155°C for 5 h. The melt blending of the materials was carried out with a Berstorff ZE 25 x 33D corotating twin-screw extruder at a melt temperature of 290°C, with a screw speed of 200 rpm, and an output of 6.4 kg/h. The extrudate was immediately quenched in a water bath and repelletized. [Pg.625]

The blends prepared by twin-screw extruder with two different draw ratios were extruded with the Brabender single-screw extruder at temperatures ranging from 180 280°C, The sample designation and specific processing conditions are given in Table 1. [Pg.625]

Figure 3 Twin-screw extruded PP-LCP blend processed at a melt temperature of 290°C with low- (left) and high-draw ratio (right). Upper micrographs are taken from the core and lower ones from the skin region. Figure 3 Twin-screw extruded PP-LCP blend processed at a melt temperature of 290°C with low- (left) and high-draw ratio (right). Upper micrographs are taken from the core and lower ones from the skin region.
Blends of polypropylene (PP) and liquid crystalline polymer (LCP) processed without melting the LCP were compared with conventional melt processed blends. In a first stage, PP was blended with 20 wt% of LCP in a twin-screw extruder with the take-up speed varied to achieve blends with different LCP fiber dimensions. In the second stage, these blends were processed both below and above the Tm of the LCP by extrusion and injection molding. [Pg.631]

The materials were dried in a vacuum oven at 115°C for 24 h. They were then melt blended by using a domestic twin-screw extruder ( 35) [screw diameter = 35 mm]. The weight ratios of PES-TLCP were 90 10 and 70 30, respectively [12]. [Pg.688]

Example 3. Hydrolysis in an Extruder.69 PET reactive extrusion experiments were carried out on a 25-mm Berstorff ZE25 corotating twin-screw extruder with a barrel length-to-screw ratio of 28 1. The extruder consisted of six barrel sections equipped for heating, cooling, and controlling the temperature of each section of the extruder. Initially reaction extrusion of PET and water was performed with cold water at room temperature injected into the extruder. Typical operating conditions were reaction temperatures of 230-265° C, extruder speeds... [Pg.562]

Most of the compounds were extrusion compounded in a conical, partially intermeshing, counter rotating twin screw extruder (Haake Reomix TW-lOO). The extruder speed was set at 50 rpm and the barrel temperature profile was set to produce a melt temperature of 260°C at the die. Samples were injection molded in a 31.8 MT Battenfeld press with a 59 cc shot size. Where noted, samples were compounded in a 60 cc Brabender internal mixer and compression molded. [Pg.345]

Details are given of ways of obtaining energy from the pyrolysis of disposable syringes. The waxy product was chemically modified with maleic anhydride and tested in the processing of PP/LLDPE blends in a rheometer or twin-screw extruder. Compatibility of components in binary or ternary blends and DSC results are discussed. 35 refs. [Pg.68]

Post-consumer PMMA plastics can be depolymerised back into their starting components. Degradative extrusion in twin-screw extruders can be used for this process. 10 refs. Translation of Kunststoffe, 87, No.2, Feb.1997, p.183-8... [Pg.70]


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Classification of twin screw extruders

Closely intermeshing co-rotating twin screw extruder

Closely intermeshing corotating twin screw extruders

Closely intermeshing counter-rotating twin screw extruders

Closely intermeshing twin-screw extruders

Co-rotating intermeshing twin-screw extruder

Co-rotating twin screw extruder

Coaxial Twin Screw Extruders

Commercial Twin Screw Extruders

Compounding extrusion Twin screw extruders)

Compounding twin-screw extruders

Conical twin screw extruder

Conical twin-screw extruders

Corotating twin-screw extruder

Corotating twin-screw extruders

Counter-Rotating Closely Intermeshing Twin-Screw Extruder

Counter-rotating twin-screw extruder

Degassing Polymer Melts with Co-Rotating Twin Screw Extruders

Devolatilization in Twin Screw Extruders

Drive Units for Co-Rotating Twin-Screw Extruders

Drive Units for Small- to Medium-Size Co-Rotating Twin-Screw Extruders

Extruder closely-intermeshing twin-screw

Extruder tangential twin-screw

Extrusion processes twin-screw extruder equipment

General Features of Twin Screw Extruders

Intermeshing Modular Counter-Rotating Twin-Screw Extruders

Intermeshing conical twin-screw extruder

Intermeshing twin screw extruder

Intermeshing twin-screw extruders

Intermeshing/nonintermeshing twin-screw extruders

Material Selection for Twin Screw Extruder Components in Contact with Resin

Mixing Twin-screw Extruder

Modular co-rotating twin screw extruder

Non-intermeshing twin screw extruders

Nonintermeshing twin-screw extruder

Nonintermeshing twin-screw extruders

Nylons twin-screw extruders

Overview of Twin Screw Extruders

Parallel twin-screw extruder

Pigment twin-screw extruder

Plastics extruders twin screw

Polyethylene twin-screw extruders

Scale-Up in Co-Rotating Twin Screw Extruders

Screw extruders

Self-cleaning twin-screw extruders

Self-wiping co-rotating twin screw extruder

Self-wiping co-rotating twin screw extruders

Self-wiping corotating twin-screw extruders

Single-and twin-screw extruders

Tangential Modular Counter-Rotating Twin-Screw Extruders

Tangential modular counter-rotating twin screw extruder

Tangential twin-screw extruders

The Twin Screw Extruder

Twin Screw Extruder Pumps

Twin Screw Extruders Applications

Twin Screw Extruders Functions

Twin Screw Extruders Hardware

Twin advantages over single screw extruders

Twin screw

Twin screw extruder, TSE

Twin screw extruders

Twin screw extruders flow reactors

Twin screw extruders intermeshing counterrotating

Twin screw extruders invention

Twin screw extruders kneading blocks

Twin screw extruders kneading paddles

Twin screw extruders pumps

Twin screw extruders reactive processing

Twin screw extruders self-wiping

Twin screw extruders types

Twin screw mini-extruder

Twin versus Single Screw Extruder

Twin-screw compounding extruder

Twin-screw extruder extrusion process

Twin-screw extruder preparation

Twin-screw extruder, blending

Twin-screw extruder, blending equipment

Twin-screw extruder, blending performances

Twin-screw extruders consists

Twin-screw extruders counter-rotating

Twin-screw extruders devolatilization

Twin-screw extruders intermeshing corotating

Twin-screw extruders mixing

Twin-screw extruders positive-displacement

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