Some of the more common quality problems of products. Among them, the most serious ones are product uncaring, wrapping, poor edge removal, and lack of materials. These are problems that are often encountered in the production process. These types of uncuring can be improved through the production process. At the same time, controlling the parameters of the production machine can effectively solve this problem.
1. Partial uncaring
Partial uncaring is characterized by the fact that the appearance and function of most parts of the silicone rubber product can meet the quality requirements after molding, and only a small part of the part has no vulcanized raw rubber, which appears on the surface of the liquid silicone product.
2. Overall Uncuring
The overall uncuring of silicone rubber products is characterized by being soft and sticky after molding. Pinching the surface with nails will leave nail marks that are difficult to restore, while fully vulcanized silicone rubber products can recover quickly after pinching. as ever.
Touching this kind of bad product will have a slightly sticky feeling. When the product is pulled by hand, the toughness and elongation of the product are stronger than that of the fully vulcanized product.
Although this kind of uncaring is no different from ordinary silicone products in appearance, it must not meet the requirements in terms of function due to the overall softness and stickiness.
The reason for this failure is very simple, the molding mold temperature is too low or the vulcanization time is too short.
3. Internal Uncuring
Internal uncuring of silicone rubber products usually occurs on larger solid products. Sometimes in order to increase the output, the temperature, exhaust, and discharge methods are adjusted during molding, so that the products that would take a certain period to be vulcanized can be released in advance.
There is no abnormality in the product released from the mold on the surface, but the inside is not completely vulcanized. If the second vulcanization is performed at this time, the silicone rubber product will bulge or even explode. Therefore, the vulcanization time of larger products must be sufficient to ensure quality.
How to solve the recurring problem of silicone products in the molding process
The situation that all liquid silicone products are uncaring will generally not happen directly, unless the vulcanization time of the product is not well controlled during the proofing process of a new product, resulting in all uncaring. In this case, it will be scrapped directly after production, and will not be left as a finished product for the next process.
Some of the liquid silicone products are uncaring. This happens from time to time during the production process. The main reason is generally the problem of the parameters of the production machine. The curing time and temperature are not well controlled, which leads to the uncuring. When making the first product, due to the problem of the operator, setting the vulcanization time too short, and the mold temperature too low, will cause such partial uncuring. Adjusting the mold temperature and vulcanization time can change this situation.
Partial uncuring of liquid silicone products is the most difficult to find in production. Often the uncuring place is relatively small, or it does not look obvious enough, so it will flow to the next process. Generally, when the mold is formed, it must be self-inspection, if the self-inspection cannot be out, then the next process will be controlled and checked.
Therefore, we must pay attention to the volume of liquid silicone products, the molding temperature, and the vulcanization time. Do not shorten the molding vulcanization time to blindly improve production efficiency. This will not only fail to meet the improvement of production efficiency but also affect production efficiency. Waste affects the orderly development of the company.