Finished Mucous Membrane, Difficult To Demould
Depending on the size and temperature of the molded product, when the mold release resistance is increased, mold release failure occurs. Although it is also affected by resin characteristics and molding conditions, the main reason is the shape of the molded article and the structure of the mold. Of particular note is the case when the slender ribs, the hub and the plastic plug are held together.
When the molding shrinkage around the plastic plug or the like is too large, the holding force on the plastic plug is increased, and the mold release is likely to occur. In terms of molding conditions, when the mold temperature is low and the holding pressure is too large, mold release failure is likely to occur.
When overfilling occurs in a erected product such as a long rib or a hub, these ribs or hubs become difficult to fall off, resulting in poor mold release. In terms of molding conditions, when the mold temperature is low and the holding pressure is too large, mold release failure is likely to occur. This is exactly the opposite of the plastic hole bolt.
When the draft angle of the cavity portion is small, the mold release resistance is large, so that mold release failure is likely to occur. The position of the ejector pin also has a large effect (it is best to set the ejector pin at a place where the draft resistance is too large). In addition, the surface finish or damage of the cavity surface also affects the mold release resistance, resulting in poor mold release.
At the time of injection molding, there is a mucous membrane in the finished product. First, consider whether the injection pressure or the holding pressure is too high. If the injection pressure is too large, the finished product will be oversaturated, and the plastic will be pressed into other voids, which makes it difficult to release the finished product in the cavity, and it is easy to have a mucous membrane when it is taken out.
When the temperature of the tube is too high, two phenomena usually occur. First, if the temperature is too high, the plastic will be decomposed and deteriorated, losing its original characteristics: it will break or tear during the demolding process, causing mucous membranes. Second, the rubber material is not easy to cool after being filled into the cavity, and it is necessary to lengthen the cycle time, which is not economical. Therefore, it is necessary to adjust the operating temperature according to the characteristics of the rubber.
As for the problem of the mold, if the feed port is unbalanced, the film will be prone to mucous phenomenon when the product is demolded. At this time, improvement measures should be made on the mold.
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