metering of blowing agents for extruders

  • How to Control Your CO2 in XPS Production Line …

    These two premises ensure the constant physical property of CO2 and it gets CO2 primed for precise metering into twin screw extruder. As I mentioned before, the density of CO2 varies when temperature changes. The highest level alarm of CO2 in the middle tank should be no more than 70% of the total volume of the middle tank in case of any incident happened, the power cut in the summer in some ...

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  • US6616434B1 - Blowing agent metering system …

    Blowing agent from a source 21 is introduced into the polymeric material by the blowing agent metering system through a blowing agent port 22 formed within the barrel to form a mixture of blowing agent and polymeric material within the polymer processing space. As described further below, the metering system controls the rate of blowing agent introduction to provide a mixture having the ...

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  • Feeding Zone - an overview | ScienceDirect Topics

    A single screw extruder with a length to diameter ratio (L/D) of 40:1 was used for foaming of cellulose acetate using HFO 1234ze as low global warming blowing agent. 24 The extruder was equipped with a mixing screw optimized for the foam extrusion process. 24 The last 11 D of the extruder length was temperature controlled with oil to cool the polymer melt. 24 The blowing agent was compressed ...

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  • Tandem Line Extrusion | PPI

    The tandem extruder at PPI consists of a 34 mm co-rotating intermeshing twin screw extruder (mixing extruder) feeding a 40mm single screw extruder (cooling extruder). Polymer pellets or powders are meter fed into the hopper of the twin screw extruder. The blowing agent is injected in the twin-screw extruder through either a syringe pump or dual piston HPLC pump at 20 L/D of the first extruder ...

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  • The metering system for blowing agents in …

    The metering of blowing agent is of particular importance to guar- antee the constant quality of the end product in extrusion processes. LEWA ecofoam is a system for the metering of blowing agents, e.g. butane, CO₂, halogenated hydrocarbons, pentane and propane into …

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  • CONEXTRU GESMBH - Products: GP Extruder …

    Extruder control from ABB, software execution acc. CONEXTRU design features, ... Dynamic mixing screw tip for best dispersion of carbon black or blowing agent Feedbush suitable up to 200 °C via external heating cooling unit with silicon oil – for some technical Polymers like PA, ABS, PVDF. Synchron motor – multiple pole permanent magnet technology for highest efficiency, air cooled ...

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  • LEWA ecofoam Blowing Agent Metering System | …

    Foam plastics with precision and safety. When producing plastics, numerous manufacturers rely on the ecofoam system from LEWA for the precise and fast metering of blowing agents in the extruder. The metered flow of the blowing agent is regulated according to the extruder output.

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  • How to Figure Out the Portfolio of Blowing Agents for XPS ...

    main blowing agent, it would be very hard to get such thickness unless your line can yield 1.5 ton per hour. But CO2 is advisable when you produce very high compressive strength board like 1000kpa for special use, because CO2 has smaller cell volume which is helpful to get finer cell structure of the board. I hope my talk can help you make a right choice at choosing XPS production line. If I ...

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  • PLASTINUM® Foam E. Eco-friendly, cost-efficient extrusion ...

    2 hinges on the accurate metering of CO 2 against fluctuating counterpressure. Due to its unique physical properties, CO 2 is more challenging to dose into extruders than traditional liquid foaming agents. Linde offers a range of premium CO 2 solutions for plastic foaming applications. This includes PLASTINUM® Foam E, designed specifically to meet the metering challenges of CO 2 extrusion ...

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  • FOAM EXTRUSION - ict.fraunhofer.de

    blowing agents. Schaumtandex ZE30/KE60 The KraussMaffei Berstorff Schaumtandex laboratory unit ZE30/KE60, which came into operation in 2011, is a flexible machine concept for the production of foamed semi-finished products using physical blowing agents. It comprises a twin-screw extruder as a primary extruder (plastification, additivation and gas nucle-ation of the polymers) and a secondary ...

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  • Foamed blow molding technology - Extrusion Head

    MÜLLER GmbH in Troisdorf, Germany has acted based on this changing awareness and introduced its innovative foam blow molding technology using only physical blowing agents. As one of the renowned market leaders in the area of extrusion blow molding systems, we have developed new extrusion heads for the production of containers with up to 20% weight reduction.

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  • Metering systems for industrial applications | LEWA

    Extruder blowing agent. Precise metering of blowing agents into extruders with LEWA systems. We provide you insights on the metering accuracy and process optimization solutions from LEWA. Read more. Extraction with supercritical fluids. Processes with supercritical fluids in pharmaceutical, food and beverage industries. Ask our experts for more information! Read more. Pharmaceutical production ...

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  • Blowing agent - Wikipedia

    A blowing agent is a substance which is capable of producing a cellular structure via a foaming process in a variety of materials that undergo hardening or phase transition, such as polymers, plastics, and metals.They are typically applied when the blown material is in a liquid stage.The cellular structure in a matrix reduces density, increasing thermal and acoustic insulation, while ...

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  • Tips and Techniques: How to Mold & Extrude …

    The solution may be as simple as increasing the level of blowing agent or increasing the extruder screw speed or even reducing the downstream line speed. However, the problem could be related to the downstream process for more involved reasons. For example, in sheet extrusion, it is critical how the sheet comes in contact with the roll bank as it exits the die. In non-foamed sheet it is common ...

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  • EXTRUSION: System Precisely Meters Blowing …

    The system pumps blowing agent such as CO 2, propane, butane, halogenated hydrocarbon and pentane in quantities proportional to extruder speed to reportedly provide precise metering even when pressures are fluctuating.

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