The production of silicone products with surface defects is a very troublesome matter, and the common occurrence is dark lines. What is the reason for the appearance of dark lines? How to solve the problem of dark lines on the surface of the product?
1、 Why do silicone products have dark marks
1. Silicone raw material
Due to the different raw material properties and product ratios of silicone products, the understanding of external adverse phenomena depends on the distribution ratio of the amount of white carbon black and silicone resin added in the product. As the raw material belongs to semi transparent solid rubber, the uniformity of mixing rubber and vulcanizing agent during the mixing process depends on the quality of the rubber material, and the factor of product surface defects is precisely the above reason!
2. Silicone mold
The mold is the core of silicone products, and the material selection on the mold steel is the main factor. Secondly, surface defects during the processing may be due to excessive pressing times, resulting in deformation of the mold and poor appearance of silicone products. Secondly, during the precision machining process of the mold, the accuracy of the mold determines the product's clamping line, self dismantling edges, and edge wheel angles.
3. Silicone product molding and vulcanization
During the molding and vulcanization process, the exhaust method and trapped air stroke of the product determine the bulging phenomenon of silicone products. Inaccurate time and temperature allocation may lead to the occurrence of dark marks. In addition, the most important thing is the operating methods and note conditions of the machine personnel. In the end, the most important thing in the processing process is to adapt to the situation, and what parameter configuration should be suitable for silicone products.
2、 What to do if dark marks appear on silicone products
Silicone products have the characteristics of colorless, odorless, and colorless. To change silicone products into colorful colors, it is necessary to add "color masterbatch". Therefore, there must be no mistakes in the selection of color masterbatch. If the temperature resistance of the color masterbatch is not good, then silicone products will basically become waste because the color masterbatch needs to be integrated into silicone products for high-temperature molding, At this point, the color masterbatch can only change color of silicone products by melting at high temperatures. If the color masterbatch has poor temperature resistance and affects the entire production, the consequences are self-evident. Therefore, it is necessary to choose the most suitable color masterbatch in terms of selection.
When selecting silicone raw materials, it is necessary to strictly control them. For example, two different types of silicone raw materials may be difficult to distinguish color difference and hardness with the naked eye, but there are differences between the two. If these two batches of silicone raw materials are mixed into a mold, if there is a small color difference found during quality inspection after molding, it cannot be shipped. Our quality inspection is very strict, For those with color differences, they can only be treated as defective products. Therefore, when choosing silicone raw materials, it is important to be clear that there is no mixing. It is important to know the source. If the head is wrong, all subsequent processes can only be soy sauce.
The cutting process of silicone products should also be noted, because if the cutting material is too thick or too narrow, it will be inconvenient to cut silicone, and it will also cause poor surface color after the silicone product is formed. Even during the cutting process, it is necessary to ensure the quality of the product.
