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fashion twin screw extruder elements

- Aug 13, 2022 -

fashion twin screw extruder elements

The twin screw extruder screw adopts modular design, combined by shaft and screw element one piece by one piece. The screw element mainly consists of the transport unit and kneading unit.

The large pitch and force transport screw element make sure the material delivered to next melting section. Large pitch+medium pitch+small pitch to make sure the material fast transport and then slow down compressed the material and filled with the screw, preparation for the compounding.

Screw design: Large pitch transport element. It must use one left-handed screw element before the exhaust port to form a backflow of material and form a high pressure for removing the volatile impurities and gases and vapors.

Screw design: Large pitch transport element. It must use one left-handed screw element before the exhaust port to form a backflow of material and form a high pressure.

In the extruder, sometimes according to the needs of the extrusion process, different pressure zones (differential pressures sometimes as high as a few megapascals) may be formed at different positions in the screw axis or within a relatively short distance. Threaded components to achieve this purpose. For example, if a liquid additive or foaming agent is added at a certain position in the axial direction of the screw, the adding position must be in a low-pressure zone. At this time, a reverse-threaded element is provided before the joining zone to form a high-pressure seal to prevent the liquid additive or the blowing agent from flowing in the reverse direction. The formation of a low-pressurezone behind the reverse-threaded element facilitates the addition of additives or blowing agents. A counter-threaded element is placed in front of the exhaust port to create a high pressure in front of the exhaust zone and a sudden pressure reduction in the exhaust zone to facilitate venting.

fashion twin screw extruder elements

Specializing in Twin Screw Extruders, CTI reverse-engineers and manufactures OEM quality extrusion wear and replacement parts for the the leading OEM manufactures in the industry such as:

All types of screw elements consisting of kneading blocks, mixing elements and convey elements from 20mm-160mm dia. in size. Manufactured in various types of wear and / or corrosion resistant materials. Specializing in CPM-10V powder metallurgic steel.

Twin Screw Extruder Barrels manufactured to OEM specifications, in nitrided steel design orwith high wear resistant, solid oval CPM-10V replaceable liners. Sizes ranging from 25mm-160mm extruder process bore diameter. (Other materials of construction options are available upon request.)

CTITwin Screw Extruder Block Style Combi Barrels manufactured to OEM specifications, withhigh wear resistant, solid oval CPM-10V replaceable linerin main figure 8 process bore and replaceable side feed insert.CTI combi barrel can be supplied with or without cooling channels. (Other materials of construction options are available upon request.)

Extruder vent diverter inserts, barrel closing plugs and injection ports manufactured fromhigh wear resistant D-2 or H-13 materials. (Other material of construction options are available upon request.)

OEM quality keyed and cold formed (hammered) splinedTwin Screw Extruder shafts for several OEM Brands ranging in size from 20mm to 133 mm extruder size.

fashion twin screw extruder elements

The XTS Twin Screw Extruder comes with a standard 24L/D Clamshell barrel, for single pass processing of most current formulations including; Functional Pipe Coatings, Re-bar, CAB Textured, TGIC formulations and clear coats and high gloss formulations where a higher output is required. Even 100% fines!

Xtrutech remains a step ahead of our competitors through the customisation and improvement of our Twin-Screw Extruders. Developing the integral Clamshell Barrel design, that provides vital internal access. The nature of this design allows for maximum production potential to be achieved, through the reduction of laborious disassembling, allowing for easy and accessible maintenance.

Additionally, XTS Extruders are complete with Side Feeders and now a 100% of fines can be recycled. In the aim of achieving a more economical design, Xtrutech’s insert style cooling blocks have water channels with 2.5 time’s greater cooling capacity, per zone than any other extruder! Our water-cooling technique is both cost and energy efficient and in turn promotes the reduction of air moisture, prioritising both sustainability and quality. XTS Extruders can be configured to a specification that focuses on the efficiency of your equipment, crafted from quality materials of UK manufacture.ModelXTS 19XTS 24XTS 35XTS 44XTS 56XTS 65

fashion twin screw extruder elements

machines with often have barrel venting. The barrels and screws of these machines are not modular so they may need to be changed for your specific application. Air and water cooling are both common.

fashion twin screw extruder elements

Among other methods, twin screw wet granulation (TSWG) is the most appropriate imminent continuous unit operation for the pharmaceutical manufacturing industry efficient enough to produce granules using reduced granulating fluid quantity as compared to traditional mixer granulators with the added advantage of consistency, better control over its stability, minimum residence time, controlled output, and more adaptable to in-line analytical tools. TSWG could substitute the current techniques for batch granulation, making the granulation process more versatile, reproducible, and cost-effective. In this twin screw granulation technique, raw material input enters the equipment where the blend is conveyed through the barrel. Granulation of raw material blend takes place because of granulating solvent like water or binder solution. Use of specific screw elements like kneading blocks and distributive elements allows agglomeration as well as the milling of the granules along the length of the barrel. Use of minimum quantity of solvent means wet granules can be dried within the barrel length using barrel temperature and thus additional drying step is circumvented. The various factors that affect the final granule quality that acts as critical quality attributes for the TSWG process include feed rate, liquid to solid (L/S) ratio, barrel fill volumes, processing temperatures, and screw elements (17, 27, 31, 35, 50, 100–103).

Dhenge et al. (2011) investigated the effect of varying feed rates from 2 to 6 kg/h on the residence time and properties of TSWG granules while maintaining other variables such as the liquid to solid ratio (0.3), screw design (two kneading zones), screw speed (400 rpm), and barrel temperature (25 °C). A nonfunctional API (sodium chloride) was combined with a solid binder (hydroxypropyl cellulose) at a concentration of 5%. The granulating agent was water. Feed rates were found to be inversely proportional to residence time distributions, owing primarily to barrel fill stage. However, the findings indicated that increasing the feed rate resulted in a greater concentration of fines of good strength. This is primarily due to material cramming caused by high feed rates and short residence times, which results in increased attrition between the wet mass and the screws and barrel. Thus, this article emphasizes the importance of feed rate on granule efficiency (104).

Portier et al. explored the effects of screw configurations (kneading elements thickness and fraction of KE elements), barrel fill levels (screw speed), and L/S ratios on model formulations using microcrystalline cellulose (MCC) and lactose monohydrate (LM) as diluents, HPMC as the dry binder, and metformin hydrochloride and mebendazole as model APIs. According to the results obtained, for formulations containing only LM as a filler, greater L/S ratio factor effects were found, expressed by the larger fines fraction similar to research data by Hwang et al. Owing to the lower specific feed load and thus barrel fill rate, higher screw speeds resulted in significantly smaller granules. Use of KE of smaller thickness (1/6 L/D) results in better attrition and increased fines. This is because the complete cutting plane is separated into more individual elements, thus increasing shear action. However, this resulted in poor flow of granules as compared to KE of higher thickness (1/4 L/D). To test TSWG’s maximum potential, the author recommended more studies on poorly soluble high-capacity APIs and different kinds of diluents (103, 105).

Apart from the abovementioned reports, many have studied in detail about various aspects affecting granules in a twin screw wet granulation process such as effect of a specific screw element on granule properties and solvent distribution (27, 107), impact of temperature on wettability of HPMC in TSWG (28), importance of barrel fill level on critical attributes of granules (29, 102), impact of varying viscosity and surface tension of binder liquid on granules (30), achieving content uniformity in ultra-low dose (108), effect of binder chemistry on granule size distribution (109), effect of varying excipient characteristics (diluents and binders) on TSE (110), and visualization of flow and mixing patterns in a TSE (111).

fashion twin screw extruder elements

The XTS Twin Screw Extruder comes with a standard 24L/D Clamshell barrel, for single pass processing of most current formulations including; Functional Pipe Coatings, Re-bar, CAB Textured, TGIC formulations and clear coats and high gloss formulations where a higher output is required. Even 100% fines!

Xtrutech remains a step ahead of our competitors through the customisation and improvement of our Twin-Screw Extruders. Developing the integral Clamshell Barrel design, that provides vital internal access. The nature of this design allows for maximum production potential to be achieved, through the reduction of laborious disassembling, allowing for easy and accessible maintenance.

Additionally, XTS Extruders are complete with Side Feeders and now a 100% of fines can be recycled. In the aim of achie