Injection molding TPE material baking material lump? Is It Due to Excessive Temperature or Prolonged Time?

Baking material is a key link in the production preparation of injection molding TPE material, the purpose is to remove the moisture of the material, to avoid bubbles, shrinkage marks and other problems in subsequent products. However, in practice, TPE materials are prone to caking phenomenon after baking, the reason is not only related to the temperature and time, but also affected by the material properties, equipment and other factors, we need to combine the specific circumstances to determine the following is the Zhongsuwang editorial sharing.

First, the reasons for high temperature caking

Injection molding TPE material contains soft segment components, more sensitive to temperature. If the baking temperature exceeds the softening point of the material, the surface of the material will gradually soften the adhesion, and the subsequent block may be formed.

Especially soft injection molding TPE materials, low hardness, high soft segment content, the softening point is even lower, improper temperature control is more likely to be triggered by the softening of the lumps, these lumps are usually sticky surface, high hardness, some of the particles may be slight signs of melting.

Second, too long a period of time to cause lumps

Even if the baking temperature is within a reasonable range, too much time may also lead to caking. On the one hand, excessive loss of moisture will change the internal stress of the material, making the particles become fragile and broken and sticking in the collision of equipment turning.

On the other hand, the accumulation of heat for a long time may make the local temperature close to the softening point, especially when the equipment is poorly ventilated and the material is piled up too thick, the heat is easy to accumulate and aggravate the agglomeration, which is relatively loose and the degree of adhesion is light.

Other influencing factors and solutions

Material formulations in the plasticizer or lubricant content is high, uneven temperature distribution of the dryer, wind speed is insufficient, the raw material is seriously damp, etc., may increase the probability of caking.

When solving the problem, you can prioritize to check whether the temperature is out of the recommended range of the supplier, and adjust the test downward appropriately. If the temperature is reasonable, shorten the baking time to avoid over-drying. At the same time, clean up the dryer, ensure ventilation, damp raw materials can be divided into batches of thin pavement baking materials.

In short, injection molding TPE material baking material lumps need to be combined with the lumps state, temperature settings and time to determine the overall. It is recommended to take the parameters provided by the supplier as the basis, combined with the production environment and equipment fine-tuning, pay attention to the storage state of the material, to avoid the problem of agglomeration, to ensure the smooth progress of injection molding production.