First, pinholes, oil holes

In the production process of resin crafts, there will be many small holes under the surface of some products. When a needle pierces it, some liquid will flow out. This is called oil hole. If there are many holes under the surface of the product There are very small holes in them, and there is some liquid in them, so they are called pinholes.

Pinholes and oil holes are produced by chemical thinners. When these raw materials are fused together, oil holes often appear. If there is less oil and thinner, pinholes will occur when they are not fused together. This problem usually occurs in the second half of the year. After the slurry is mixed, there will be stratification. There are several ways to solve this problem:

1. The amount of oil involved should be controlled before the slurry production, and then mixed evenly before use.

2. In the production process, some relatively high-concentration resin raw materials are used to reduce the layering of slurry water when stone powder is added.

3. Pay attention to moisture when filling stone powder, because too much moisture will cause delamination.

4. The amount of oil involved must be strictly controlled. Under the environment that does not affect the spraying, the amount of oil involved should not exceed five thousandths, and the less the better.

Second, stomata

In the production of resin handicrafts, for products with very complex structures and too small, pores are most likely to appear at corners with high hollow resistance such as corners. Some pores even expose the surface of the resin product. To solve these problems, some resins Handicraft manufacturers use the following methods:

1. In the process of delicate and complicated mold design, the problem of pores should be taken into consideration, and the design should be divided into type, and vents should be added at the corners, so as to facilitate the evacuation effect and reduce the probability of occurrence of pores.

2. Use as few white and red raw materials as possible to increase the solidification time of resin crafts, in order to save enough time to extract air from the mold.

3. Check whether the vacuum extractor has any mechanical failures. Make sure that the evacuation speed of the resin crafts in the vacuum box reaches 0.2Mpa quickly, so that the vacuum can be handled well, and some resin crafts manufacturers are concerned about large-scale resin crafts. The product adopts the vacuum degree to reach 0.2Mpa, then reduce to 0.08Mpa, and then back to 0.1Mpa, this kind of evacuation effect is also very good.

4. Use some dilute resin raw materials or fill less fillers to make a relatively dilute slurry raw material, so that the air in the mold can be removed when the air is pumped, and no bubbles will appear on the surface of the product.