Vacuum Casting

Vacuum casting refers to using the original template to make a silicone mold in a vacuum state, and pouring it with PU material in a vacuum state, so as to clone the same replica as the original template. Due to its fast speed and low cost, this technology greatly reduces product development costs, cycles and risks.

The materials for making silicone molds are: domestic silicone, imported silicone, transparent silicone, and special silicone.

The materials used in the reproduction products are: domestic PU, imported PU, transparent PU, soft PU, Saigang, ABS, PP, PC, high temperature resistant ABS, etc.

The production process of vacuum casting:

Before making the silicone mold, you need to make an original plate, which can be made by cnc processing or 3D printing, and then start making the silicone mold. The silicone and the curing agent are mixed evenly. The appearance of the mold silicone is a flowing liquid, and the A component is silicone , B component is curing agent.

Vacuuming and removing air bubbles: After the silica gel and the curing agent are evenly mixed, vacuumize and remove air bubbles. The vacuuming time should not be too long. Under normal circumstances, it should not exceed ten minutes. If the vacuuming time is too long, the silica gel will be cured immediately. A cross-linking reaction occurs, making the silicone piece-by-piece, unable to be painted or poured.

Brushing or operation process: pour the silica gel that has been evacuated from the air bubbles on the product by brushing or pouring (Note: the product or model to be copied before pouring the silica gel must be released with a release agent or release agent), Then apply the silica gel on the product. The coating must be even. After 30 minutes, paste a layer of gauze fiber weft cloth to increase the strength and tension of the silica gel.

The production of the outer mold: the general method and material used are to surround the mold with plastic boards or wooden boards, and fill the mold cabinet with plaster. Just paste a layer of glass fiber cloth, then paint and paste, and repeat two or three layers to complete the outer mold of the mold.

The operation method of pouring or pouring mold: pouring or pouring mold is used for relatively smooth or simple products. There is no mold line to save labor and time, that is, put the product or model you want to copy, and put the vacuumed silica gel directly. Pour it on top of the product, wait for the silica gel to dry and mold, and then take out the product. (Note: The perfusion mold is generally made of silica gel with softer hardness, so that it is easier to demould and will not damage the product in the silicone mold).

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