Other customized silicone parts

When there is no pressure inside the duck-bill valve, the duck-bill valve will automatically close under the elastic action of the outlet itself, and with the internal passing of liquid, the pressure gradually increases, and the outlet of the duck-bill valve gradually increases, ensuring that the liquid can be discharged under high-speed flow. When there is no liquid through the inside, the pressure is restored, the duckbill valve outlet automatically closes, preventing the external liquid backflow and effectively preventing liquid reverse osmosis.

First, the size problem
Characteristics: uneven product thickness, shape size is out of whack, its size does not meet the requirements of the drawing
Causes: 1. Poor parallelism of equipment and mold 2. Silicone shrinkage is not calculated correctly. 3. Poor tooling

Second, the lack of rubber waste
Characteristics: the product does not have an obvious outline, its shape does not meet the requirements of the pattern products have an obvious outline, but there is a local sag, lack
causes: 1. The weight of the compound loaded is less than expected 2. When pressed, the rise is too fast, and the rubber material does not fill the cavity and overflow the mold 3. Third, the exhaust conditions are not good.

Product flash thickening
Characteristics: The silicone rubber products have the thickening phenomenon at the parting surface of the mold.
Causes：1. Overloading of glue 2. The mold does not have the necessary residual groove or the residual groove is too small 3. Insufficient pressure

Four, Bubble
Characteristics: the surface and interior of silicone rubber products have bubbling
Causes: 1. When pressing, the air in the cavity is not completely discharged 2. The compound contains a large amount of water or volatile substances 3. Mold exhaust condition is not good 4. The weight of the rubber material loaded is not enough.

Five, Convex and convex defect of silicone
Characteristics: silicone rubber products have convex and concave marks on the surface of the cause: 1. Machining marks left by mold processing 2. The adhesive material itself has defects (such as large viscosity or overdue) 3. Mold exhaust conditions are not good

Six, silicone crack
Characteristics: silicone products on the rupture phenomenon causes: 1. When taking out the product during mold opening, the product is scratched 2. Due to excessive brushing of spacer in the cavity, the phenomenon of lamination of the compound 3. Mold structure is unreasonable 4. The molding method of rubber material is unreasonable (especially fluorine rubber and high hardness butadiene rubber)

Seven, Creasing cracks, separated layer
Characteristics: product surface creasing, product surface and internal cracks, separated layer phenomenon
Causes: 1. The cavity is filled with dirty glue 2. Too much spacer applied in the cavity 3. Mixing of different rubber materials 4. The process operation (molding, feeding method) is incorrect

Eight, Impurities
Characteristics: the surface and inside of the product mixed with impurities
Cause: 1. The rubber material is mixed with impurities in plasticizing, mixing, storage and transportation. Mold is not cleaned up (including flash, waste rubber is not cleaned up)

Nine, Parting surface dislocation
Characteristics: products in the parting surface has a large dislocation
Causes: 1. Mold manufacturing accuracy error and processing accuracy are not enough 2.45 degree parting rubber ring due to the thickness of the flash 3. Mold positioning is poor

Ten, Roll edge
Characteristics: products in the parting of the obvious inward shrinkage phenomenon caused by: 1. Poor processing properties (such as fluorine rubber) 2. Mold structure is not reasonable (thick products should use closed structure mold and reasonable opening of residual tank)