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Coextrusion

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  • 17/10/2018

Coextrusion enhances the process of extrusion coating and lamination. Prior to single-pass coextrusion, the use of a sandwich resin structure required multiple passes or multiple coaters from a single coater. Coextrusion is used to reinforce recyclable waste in cylinders such as water vapor or liquid transfer rates, use inexpensive bulk resin raw materials or minimize the use of expensive materials, add colorants, and the like. Each of the resins used should be selected so as to have one of the a…

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Seam extruder die _2

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  • 16/10/2018

The final forming section or lip must be adjustable with the resin transverse thickness control of the die. This can be achieved by moving one lip to move the other lip. This movement can also be made by means of a large-diameter hard-form lip (hard-formed lip profile or curved shape), or by reducing the cross-section of the upper die body and pushing it to the lower part to create a splicing or The bending effect creates a flexible (soft) lip. The die of the hard lip is often used to differentia…

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Seam extrusion die _1

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  • 15/10/2018

When a single extruder is used, the resin typically enters the population mold from the needle valve through a 25-37 mm diameter drop tube. The die must distribute the material throughout the exit width to form a suitable thickness and a smooth surface. The most common method is to place the die over the web. The extruder exit material is just vertically downward.This flow occurs in the centrally fed manifold, allowing the viscous resin to flow equally to the end of the die as it attempts to flow…

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Valve device for extruder

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  • 12/10/2018

After passing through the web (but in front of the die), it is preferred to have a polymer pressure limiting device to vary the total outlet pressure required for good mixing within the screw, and the possibility of using a fixed orifice is small. The most common is the variable needle valve, which is simply placed at a right angle from the horizontal extruder screw and connected vertically to the upper part of the die. Both the needle and the valve seat have a cylindrical section, and the needle…

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Mesh filter for extruder

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  • 11/10/2018

The resin is filtered after leaving the barrel and screw area to ensure that a clean polymer is applied to the web. The filter also reduces infusibles such as fish eyes and gels in the polymer melt stream. The most common type of filtration in coating/composite extruders is a stack of screens or layers of the same or different mesh. Since the viscosity and pressure of the polymer are greater than the web stack can withstand, there is a breaker plate on the back for supporting the screen mounted o…

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Base plate structure of extruder

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  • 10/10/2018

Base plate of the extruder: The base plate supports various components such as a drive unit, a gear reduction box, a barrel bracket, a barrel cooling system, and a die holder.The barrel bracket must be designed to withstand thermal expansion due to the temperature difference between the room temperature and the operating temperature of the barrel, and is usually fixed in the direction of the die by fixing the drive to the reduction gear unit. These brackets should be kept straight horizontally an…

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