How to remove mold fouling phenomenon reasonable - mold, mold fouling, cleaning, mold export - metal

Published: 21st March 2011
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As Plastic Additive Precipitation in the Mold Or a roller formed on the surface sediments, known as the Mold Dirt which is usually to squeeze a great deal of trouble processing it causes a variety of issues, including the extrusion or injection molding processing time resulted in contact with Machinery Attached to the surface color, or even the complete failure of process. If they have not yet mastered a more effective collection methods, processors often have to spend considerable time and manpower to remove the dirt.



Simple design will help mold the shape of one side while running the production line of mold fouling removal. Extrusion profiles by changing the angle from the mold to change the distribution of fouling in the mold to help mold cleaning. Mould fouling may also be operators intend to remain in the product, to the production line again when further downstream cleanup. Such as the plate production process, machinery equipped with automatic scrapers, which can effectively remove the fouling.



However, regardless of which method to remove the fouling, require manufacturers to pay a high cost of downtime. Export position in the mold release agents or silicone can be used effectively reduce the frequency of fouling generated, to extend the machine needs cleaning cycle. Deceleration operation can reduce the fouling rate of the machine, but this will affect the output of the machine output. All of these methods are only stopgap measures, the paper will introduce a better solution to remove fouling.



Mold and mold fouling causes the stress in the export. Surface of the mold resin flow slow down the flow, but will die out suddenly accelerated flow. This sudden acceleration in the melt to generate a strong stress. For this stress, low molecular weight polymer component and other components of the melt separated and stacked in the mold exit. Therefore, solutions including the reduction of the exit die of stress or reduce the melt polymer molecular weight components of the gap. These relates to processing technology, materials or mold design improvements.



Improve the processing technology Increase mold and melt temperature is to reduce the die exit stress approach, but will have other problems, such as material degradation, leading to melt the rapid increase of low molecular weight components. Therefore, the melt and mold temperature should be considered separately. Another possibility is that the temperature of the lower mold may cause a cold surface of the mold resin layer, it flows to the die exit was very slow, due to differences in velocity, cold resin layer and the separation of the main flow of hot resin to form fouling.



First, determine the melt temperature, melt temperature and then designed based on the shape of the mold. Here, the standard melt thermocouple is often not precise enough, so need to manually check the melting temperature of way. This is despite some difficulties, but in order to eliminate mold fouling phenomenon, it's worth a try. In addition, the mold surface temperature of exports low temperature than the mold itself, need to check the mold surface thermocouple temperature of the exit.



Exit in the mold using blowers, which can effectively help reduce and control the production of fouling. Blast I should stick type, and consistent with the shape profile extrusion, blow with compressed air drilling. Blowers can be any smoke away from the Web results, and compressible objects die, the benefits of this approach is the blast, while another may be cooling mold fouling, so that it can not easily be oxidized and darkened. Nitrogen can also be used to prevent oxidation, but be careful control of the intensity of blowing or over-cooling can not die, because this may affect the quality of extrusion profiles.



Different materials to improve the material can produce different types of mold fouling, flow easily from thin to thick soft. Thin trade flows may be caused by low molecular weight polymer component fouling caused by their exit in the mold and deposited on the mold surface evaporation. Thick soft fouling is often within the partial melt from the bubble, such as material compatibility issues between, or Die the stress is too high. Here, the need to pay attention to whether there is excessive resin and the resin is degradation of water degradation, as well as melt fracture, or inadequate ventilation.



Number of resin suppliers more prone to fouling than other issues, so far, the market has not been fully integrated resin specifications. In the event of mold fouling phenomenon, you can try using another provider the same level of material. If you find that the phenomenon of fouling after the introduction of new materials, improved communications may be the original resin suppliers believe that they will be interested to listen to and analyze the performance of materials, there may be problems, and solve.



about author:

I am an expert from walldecorationsticker.com, while we provides the quality product, such as China quote wall stickers , China removable decals wall, removable sticker wall,and more.

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