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How does a custom silicone mold manufacturer deal with the tearing problems
How does a custom silicone mold manufacturer deal with the tearing problems

Tech Updates

How does a custom silicone mold manufacturer deal with the tearing problems?

custom silicone mold manufacturer is the basic unit of silicone production, they are responsible for many silicone production tasks including silicone rubber parts manufacturing.

The design of a liquid silicone mold tearing groove has many advantages, but it also has its post-processing difficulties. Therefore, to make liquid silicone products, it is necessary to have sufficient preliminary evaluation and sufficient mold flow analysis.

1. Characteristics of silicone rubber parts manufacturing

Liquid silicone itself is non-toxic, heat-resistant, high-recovery flexible thermosetting transparent material silicone, and its rheological behavior is mainly low viscosity, fast curing shear thinning and high thermal expansion coefficient. Due to its high fluidity, the corresponding products are very prone to burrs, and liquid silicone is very easy to form bubbles during the flow process, resulting in the formation of pores inside the product.

2. The significance of liquid silicone mold as tearing groove

Due to the characteristics of silicone, it is easy to form vacuum bubbles, so the exhaust requirements of the mold are very high, but at the same time as the exhaust is opened, the corresponding products will have flash, so how to reasonably increase the tearing groove is particularly important. The tearing groove is one of the key indicators for judging the level of silicone rubber parts manufacturing. The significance of silicone as a tearing groove is as follows:

①. The end of the product into the glue is used as a tearing groove, which is conducive to the discharge of the mold cavity gas; custom silicone mold manufacturer especially will put this design into practice.

②. The edge of the product or the edge of the special structure is equipped with an exhausted groove, which is conducive to the removal of product burrs and the discharge of vacuum trapped air; this problem must be paid attention to in silicone rubber parts manufacturing.

③. The design of the tearing groove is beneficial to the balanced filling of the mold cavity and reduces the influence of the injection accuracy of the machine itself;

④. The design of the tear-off groove is conducive to the filling of the product.

3. Design principles for custom silicone mold manufacturer

①. Try to design it at the end of the product into the glue;

②. In the early stage, through the mold flow analysis data, the tearing groove is added at the bonding line, the hole and other positions as permitted; in most cases, early analysis is quite necessary for custom silicone mold manufacturer A pre-production process.

③. The product is not easy to seal the glue position as far as possible to tear the edge, so that the product can remove the burr; in fact, we cannot avoid silicone rubber parts manufacturing and discuss this issue alone.

④. The product structure needs to be disassembled into the sub-place, and the edges should be torn as far as possible.

Design principles for custom silicone mold manufacturer

4. Post processing and deburring method of tearing edge groove

The tearing groove generally requires post-processing, generally the following processing methods:

①. Manual edge tearing: low efficiency, incomplete edge tearing, and local residual problems. However, the torn edge will not cause subsequent pollution or cause secondary damage to the product quality; so this method has been abandoned by most custom silicone mold manufacturers .

②. Grinding the burrs: first, tear the edges manually and then polish the burrs. After grinding, the surface of the product is clean, but it needs to be cleaned twice, and there is a risk of secondary grinding damage to the product; This is part of silicone rubber parts manufacturing , is easily overlooked.

③. Special equipment for post-processing burrs: After manually tearing the edges, special equipment processes the burrs. The surface of the product is clean after treatment, but it may contaminate the product (especially white products). manufacturing has important value.

In short, the design of the tear-off groove has many advantages, but it also has its post-processing difficulties. Therefore, to do a good job of liquid silicone products, it is necessary to have sufficient pre-assessment and sufficient mold flow analysis. I have to admit that various situations require careful analysis after the custom silicone mold manufacturer is decomposed.

In the case of a vacuuming structure, try to use a vacuuming structure to clean the gas in the mold cavity and the gas of the silicone itself, but it still cannot be solved in this case, and then an auxiliary tearing groove design can be added . Liquid silicone bubble problem.

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