Raw Material

Our Butterfly Valve Rubber Seat compound from world class suppliers or domestic rubber supplier and customized pantone code is available, hardness from 30 to 90 Shore A.

Size

Standard size with our current mold or customized according to your sample or drawing( 2D, 3D drawing , format STP, DWG, PDF , etc)

Quality and Certificate

We execute ISO9001 quality system and our Butterfly Valve Rubber Seat With Hole has passed ROHS/Reach/WARS certificate.

Mold and tooling

In house tool making and free of tooling charge for standard rubber seat, the mould parting line will be sent to customer confirmation.

Management and quality tracking: Strict material traceability under ERP system.

Butterfly Valve Rubber Seat process flow

PO confirm---Develop mold according to drawing or sample---Develop chemical formula according to specifications---Mix the raw material as per formula---Prepare and Install the mold on the machine---Preform the rubber compound---Put the compound into mold and vulcanization with certain temperature and pressure---After a while, remove the goods from the mold---Trimming the flash---Inspection---Packing---Shipping

Small MOQ: there’re variety Butterfly Valve Rubber Seat in stock, so mini MOQ is acceptable.

Function: support and protect

Payment: T/T, L/C, Credit card. USD, RMB ,Euro and so on other currency is available.

Trade Term: EXW, FOB, CIF etc

Package: poly bag and carton(40*32*25CM). If you need pack by pallet or other customized package, it’s also ok.

Shipping method: By air, by sea, by express, multi-modal transport

Rubber products are a common phenomenon in the production, which refers to the appearance quality defects such as bubbles, lack of glue, bright scars and dents in the molding curing process.

Generally speaking, the reasons are as follows

1. Mold structure: the more complex the product model parting line is less, the gas is not easy to run out; Or there is no running slot, running slot size is too small, the lack of exhaust holes, exhaust holes are not properly placed outside, can lead to the production of gas. Reasonable design of glue overflow tank and vacuum can be improved.

2. Compound formula: when designing the formula, the reaction between the complex agents is ignored, resulting in bubble gas; Or the rubber material itself damp, internal and surface moisture, will be in the vulcanization gasification and gas; Or the decomposition of some of the glue itself releases gas or low-volatile components overflow. It is recommended to add moisture absorbing materials, mobile agents (exhaust additives), and materials with low volatility, such as resin and oil, as raw materials.

3. Molding process: considering the specific gravity and volume of the rubber, the quality of the semi-finished product should be appropriately greater than the quality of the finished product; The shape of semi-finished products and improper placement in the mold cavity; During vulcanization operation, the pressure speed is too fast, and the gas can not be discharged in time. It is suggested that rheometer T10 operation glue burning time is prolonged, vulcanization temperature is reduced, more exhaust gas or vacuum.

We can improve the phenomenon of air stagnation from the following aspects:

1. Reasonable curing temperature, low temperature for a long time to improve the fluidity of the rubber material in the abrasive tool.

2. The vulcanization boost speed should be appropriate, not too fast figure fast, pay attention to multiple depressurization exhaust, especially the operator, in accordance with the vulcanization procedures for conditional vacuum.

3. Formulate reasonable molding process of semi-finished products, pay attention to the influence of charging shape on product quality, and make different shapes and sizes of semi-finished products for different products. In addition, coating a small amount of calcium carbonate or talc on the surface of semi-finished products is also conducive to improving the appearance quality of products and adding mobile additives.

4. Maintain the vulcanizing equipment and mold, ensure the normal operation of equipment, mold clean, exhaust hole and running groove smooth.

5. When designing the formula, we should take into account the characteristics of raw materials, do not use or use less material with high moisture content, if we must use appropriate pretreatment, develop appropriate glue mixing process, to ensure that the glue through mixing, can exclude more water. Conditions promise good backpressure effect.

6. Reasonable design of mold structure, design the necessary parting lines, running grooves, exhaust holes. For complex products with high requirements, it is better to use the mold vacuum pump with injection pressure flow rubber hole to vacuum.

Conclusion

Products want to avoid boring, bright scar, to choose low volatile components from the material, formula design to extend the coke burning operation period to improve the fluidity of the rubber, molding temperature is appropriate for several rows of gas, abrasive design is reasonable and conditional vacuum.