Method for eliminating black lines and black veins on surface of PVC extruded product
A technology of black lines and black lines, applied in the field of eliminating black lines and black lines on the surface of PVC extruded products, can solve the problems of increased cost and ineffective effect, reduce waste, avoid black lines and black lines, and improve the quality of finished products rate effect
Active Publication Date: 2010-04-07
LIANSU TECH DEV WUHAN
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Problems solved by technology
In order to avoid this situation, manufacturers generally improve the appearance of the product by changing the formula, but the effect is not obvious
Another is to repair or replace the barrel and screw of the extruder, which can only temporarily solve the problem of black lines and black lines. After a long time, the same problem will appear again after the screw and barrel are worn out, and it will also bring cost. Increase
Method used
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Embodiment Construction
[0021] The present invention will be further described below in conjunction with the accompanying drawings.
[0022] Figure 1 is a schematic diagram of a perforated plate, including two layers of feed holes symmetrically distributed inside and outside. There is a raised cone in the center of the feed end, and there is an axial feed hole in the center of the cone. The distribution density of the feed holes at the feed end is higher than the distribution density of the feed holes at the discharge end.
[0023] Figure 2 is a cross-sectional view of the perforated plate structure. It can be seen from the figure that the symmetrically distributed feed holes of the inner and outer layers are not axially parallel but cross each other at a certain angle. The feed end becomes the inner layer, and the feed hole in the inner layer becomes the outer layer at the discharge end. The feed hole forms a certain angle with the central axis. Viewed from the feeding direction, the angle β betwe...
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The invention provides a method for eliminating black lines and black veins on the surface of a PVC extruded product. A porous plate is arranged between an extruder connector and a die head, and melted materials of carbonization materials adhered to the surface of the porous plate can be fully dispersed and plasticized so as to eliminate the black lines and the black veins on the surface of the extruded product; and the porous plate is provided with inner layer material through holes and outer layer material through holes which are distributed crosswise. The method prevents frequent formulation adjustment from increasing the cost, meanwhile, prolongs the service lives of an extruder screw and a screw tube, improves the appearance of the product and improves the performance of the product. A device used by the method of the invention has no PVC melted material hidden dead angle so as to reduce the accumulation of impurity and coke charge, only needs to be cleaned by periodically replacing a net, and does not need to be halted and started with material waste.
Description
technical field [0001] The invention belongs to the field of PVC extrusion molding, and in particular relates to a method for eliminating black lines and lines on the surface of PVC extruded products. Background technique [0002] In the field of plastic molding processing, PVC is relatively difficult to process. It needs to add stabilizers, processing aids, lubricants, anti-impact agents and other additives to produce a mixture through a high-temperature mixer before it can be sent to the extruder for processing. In addition, each In order to reduce the production cost, the manufacturer will add a large amount of fillers and recycled materials to the mixture. Such a mixture will inevitably accelerate the wear of the equipment. Due to the long-term operation of the extruder, the friction between the screw and the barrel will damage the contact surface. There will be damaged points on the surface of the barrel or screw, and the molten material hidden there will be carbonized ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B29C47/36B29C47/68B29K27/06B29C48/395
CPCB29C47/12B29C47/38B29C47/0816B29C47/0883B29C47/362B29C48/2556B29C48/272B29C48/362B29C48/395
Inventor 徐风飞
Owner LIANSU TECH DEV WUHAN