1. Inappropriate temperature: In the thermo-compression molding process, if the temperature is not set appropriately, it may result in the edge portion of the pulp being too hot or too cold. Overheating will soften the pulp thermally and the edge part will rot easily; overcooling may cause the pulp not to melt sufficiently, resulting in rotten edges.
2. Uneven pressure: When hot press molding, if the pulp in the mold pressure distribution is not uniform, the edge part of the pressure may be insufficient to fully solidify and firm, resulting in rotten edges.
3. Unreasonable mold design: The design of the mold may also affect the effect of pulp hot press molding. If the edge part of the mold is not well designed, such as the shape is too sharp or uneven, it will cause the pulp to break or deform easily under pressure, resulting in rotten edges.
In order to solve the problem of pulp molding hot compression molding rotten edges, the following methods can be considered:
1. Adjustment of temperature: to ensure that the hot compression molding temperature is moderate, can be adjusted according to the requirements of the specific pulp material, to avoid overheating or overcooling.
2. Apply pressure uniformly: ensure that the pulp is subjected to uniform pressure distribution during hot compression molding, which can be achieved by adjusting the mold, improving the molding process, etc.
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3. Optimize mold design: Reasonable design of the edge of the mold, to avoid too sharp or uneven shape, in order to reduce the risk of deformation and breakage of pulp in the molding process.
4. Choosing the right pulp material: Different types of pulp materials may have different adaptability to thermo-compression molding, and choosing the right pulp material can reduce the incidence of rotten edges.
It should be noted that pulp molding hot compression molding is a complex process that may be affected by several factors. Therefore, it may be necessary to consider multiple factors and make appropriate adjustments and improvements when addressing the problem of rotten edges.