The use of the mold silicone
the use of silicone mold method
a, tools and materials to prepare
choose ready for mold silicone products, mold a, electronic said a mixing container, a stirring knife is a tool and the material, etc.
2, mold processing
will die grinding and polishing processing is smooth, then besmear brushs release agent, release agent must besmear to brush evenly ( Release agent can be a detergent, soap and water, vaseline, liquid paraffin, etc. ) Dry, after with gauze. If do shard die, want to choose good painting line.
note: release agent uneven coating, easy to cause the demoulding, some complex pattern release agent reach of the coating, not parting, module and stick on the mould damage model species.
3, fixed mode of
the model with glue on the board, according to the different way of open mode to process the mold, concrete pouring die, BaoMo, shard mold cavity method.
if the perfusion model:
irrigation mode or perfusion model, is used to compare smooth or simple products, no save work line to save time, would you want to copy product or model, with plastic board or glass, and glue to seal around, in order to avoid a gap filling silica gel, silica gel along the gap flow out.
note: silicone rubber sheet or glass contact place also want to make release agent.
if the shard mode:
the part under the die line with sludge, with flattened FuHua, with the sludge around the tool will be cut off, distance
mode of 1 cm 1. 5 cm is preferred.
4, silicone products and curing agent ratio
estimate dosage of mold, mold the silicone appearance is flowing liquid, A component is silica gel, team B is curing agent. Using electronic weighing the silica gel, and then according to certain proportion weighing firming agent, general agent content is 2% 3%, example: take 100 grams of silica gel, add 2 grams of curing agent, adhesive and curing agent, ( Note: silicone and curing agent must stir well, if there is no uniform mixing, the mould will be a piece of has solidified, a no cure, silica gel can appear uneven drying curing condition will affect the service life of the die and the silicone mold number, and even cause mold scrapped.
5, vacuum exhaust bubble processing
after the silicone and curing agent mix, vacuum exhaust bubble link, vacuumizing time shoulds not be too long, under normal circumstances, not more than ten minutes, vacuum time is too long, the silicone products curing immediately, the crosslinking, make the silicone piece by piece, cannot besmear to brush or infusions, thus wasting the silica gel, can only put silica gel in the trash, to take silica gel to do again.
6, mould plastic operation process
general with besmear to brush or filling operations, mainly divides into: perfusion modulus, BaoMo, shard.
1, the method of irrigation mode or perfusion mode of operation:
according to the mode of fixed, and will die after fixed, a vacuum of silica gel directly into the product, after being dry silica gel forming, take out the products, mold is molding the ( Note: perfusion model generally adopts the soft hardness of silica gel to do die, so that parting easier, not damage the inside of the silicone mold products) 。
2, BaoMo or subdivision model operation methods:
align time bubble of silica gel, by brushing or perfusion. Pour in the product above ( Note: to replicate before pouring silicone products or model release agent must be hit or isolation agent) 。 Then put the silica gel coating on product, besmear brushs must be uniform, a layer of gauze in firbre cloth paste 30 minutes to increase the strength of the silicone and tension. And coating a layer of silica gel, then a layer of gauze in firbre cloth paste, so after two is ok. Only by doing so, out of the silicone mold service life and mould number relative to improve a lot, can save cost and improve efficiency. If it is a large products, also can stick to the glass fiber cloth, but the glass fiber cloth can't on the floor, because it's hard, mold inside will not smooth. External mold production: general methods and materials is to mold all round, with rubber plate or wood, used a plaster will die ark filled is ok, another way of using resin coating, coating a layer of a layer of glass fiber cloth paste resin, stick, besmear again again repeated two or three layer, can complete the die mould.
in this paper, from shenzhen Cupidove silicone factory
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