What are the common problems in mold design and processing?
. Why does the mold turn over less frequently?
In the process of making the mold, too much silicone oil is added, and the silicone oil destroys the molecular weight of the silicone, so the number of times the mold is turned over is small and not durable. If it is said that small products with complex patterns are used to open the mold with silicone with high hardness, there will be a phenomenon that the number of mold turning is less, because the time when the silicone is too hard will be very brittle and easy to break. On the contrary, if the mold is made of silicone with less hardness, the result is not satisfactory. Since the silicone is too soft, its tension and tear strength will decrease, and the mold will deform, so the number of flips will decrease. The quality of the mold glue itself is very good, and the silicone is not good or bad, only suitable or not. This does not happen when we make molds with silicone that is suitable for the hardness of the product.
- Why does the mold burn out?
Since the unsaturated resin and resin products are added with peroxide curing agent, the resin reaction will generate a lot of heat. The resin curing time is generally 3 minutes, and the mold is released as soon as possible after 3 minutes to prevent the phenomenon of silicone mold burning.
3. The method of filling the mold and the production method of the slicing mold
The operation method of the slicing mold or the slicing mold: brush or pour the vacuum silica gel for construction. If you are making a sheet mold or a split mold and using the brushing method, apply a layer of release agent or release agent to the product or model to be replicated before painting, then apply silicone to the product and wait 30 minutes. Apply a layer of gauze or fiberglass cloth to the surface for strength, then apply a second layer of silicone. After the silica gel is dried, the outer mold is made. The outer mold can be made of materials such as plaster or resin.
The operation method of the pouring or pouring mold: the pouring or pouring mold is used for smooth or simple products, that is, the product or model to be copied is surrounded by a plastic or glass plate, and the vacuum silicone is directly poured into the product. After the silica gel is dried and formed, the product is taken out and the mold is formed. The above is the whole process of mold use and operation.
4. Why does the mold appear dry on the outside and not dry on the inside?
The mold is a condensed silicone that cures by absorbing moisture from the air. Silica gel evaporates water during the production process, and this happens without adding an appropriate amount of water.
5. Why does the mold have poor tensile force?
Because in the process of making the mold, in order to reduce the viscosity of the silica gel and make the silica gel easy to handle, a large amount of silicone oil is added to the silica gel to make the silica gel very soft, resulting in the phenomenon of intolerance, reduced tear strength, and poor tensile force. , resulting in the phenomenon that the mold is not durable, the service life is short, and the number of mold turnovers is small.
6. Why does the mold appear oily?
The mold itself will not emit oil, because the complex silicone oil (silicone oil and white mineral oil complex) is added during the operation, because the white mineral oil is a petrochemical product, not a silicone oil.
7. Why does the mold made by the mold have traces, streaks, and unevenness on the surface?
This phenomenon occurs why the product or model to be reproduced is not ground or polished. Because in fact, the model or product itself is not smooth or perfect, if the product or model to be reproduced is not sanded or polished, no matter how good the mold made of silicone, it will not be beautiful and smooth. Another situation is that when removing the mold, uneven brushing can also cause the mold to be uneven.