1. Pad printing head formula
(1) Silicone rubber-various types of room-temperature vulcanized silicone rubber (2) Silicone oil-structure control agent used to improve the hardness and processing performance of pad printing heads (3) dibutyltin laurel acid-accelerator (4 ) Ethyl silicate——Crosslinking agent
2. Silicone oil content
The amount of silicone oil directly affects the hardness of the pad, but the ratio of silicone oil to silicone rubber has an allowable range. Within this range, the physical properties of the pad are better. The smaller the range, the smaller the compatibility of silicone oil and silicone rubber; the larger the range, the greater the compatibility. This range can be determined through experimentation, that is to say this ratio is not arbitrary, and beyond this ratio, the manufactured glue head cannot be used.
3. Curing agent content
The content of vulcanizing agent is generally controlled within 5% by mass. If too little, the crosslinking of silicone rubber is insufficient. The vulcanized rubber will contain raw rubber components, which appear to be sticky. Brittle and low tear strength. To improve the tear strength of the silicone head, an appropriate amount of reinforcing agents such as no black and white carbon black can be added to the rubber formula.
4. crafting process
(1) Preparation of glue
According to the proportion of each component in the formula,
First calculate the volume of the plastic head to be made,
Then roughly calculate the mass of each component,
And pour into fixed containers separately.
(2) Stirring
Stir the mixed glue well under the mixer to make it evenly mixed to form a stable, uniform color liquid.
(3) Vacuum
Place the mixed liquid under the vacuum pump and evacuate it. Water vapor is generated during the vulcanization of silicone rubber, and due to the high viscosity of the silicone rubber mixed liquid, it is easy to be mixed with air during stirring. In order to prevent the gas from mixing into the elastomer, it is necessary to perform vacuum treatment in advance.
(4) Making plastic head model
Corresponding glue heads should be designed for different substrate shapes and areas. The design of the plastic head should consider the exhaust function and the expected deformation treatment. The designed plastic head is then handed over to the mechanical processing department to make the aluminum alloy model, and then the unsaturated polyester resin is used to cast the master mold. The master mold is an essential tool for casting the finished plastic head. Before casting, the mold release agent must be evenly coated on the inner wall of the mother mold to facilitate mold release.
(5) Vulcanization conditions
Room temperature 25 ℃
Gel time 2h
Curing time 8h
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