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30

2021-03

Why the rubber sealing strip products will appear bubbles？

Why the rubber sealing strip products  will appear bubbles？ Automobile sealing strip is one of the important parts of the car, widely used in the door, window, body, seat.Car sealing strip, chair, skylight, engine case and trunk and other parts, with waterproof, sealing, sound insulation,dustproof, frost proof, shock absorption, heat preservation and energy saving important role, car sealing strip can improve air tightness, prevent wind and rain into the compartment； Once the aging of the car seal strip is damaged, it will cause the car leakage, and the wind noise of the car will increase, and the rain leakage will easily make the body rust.Then the car door seal and other rubber seal products in the production process of some problems may lead to the door seal and other rubber seal surface bubble phenomenon, what is the specific reason? Analysis of causes: 1.The auxiliaries in the compound are not evenly dispersed during mixing 2.Vulcanizing agent impurities more, small molecule impurities into early decomposition, bubble residual products 3.Mixing temperature is low, there is moisture, moisture volatilization is not net, when the temperature is high, the rubber is easy to melt when the sulfur is added to the opening mixer, or the sulfur is burnt 4.The glue material is not placed enough time or not placed on the production and use 5.Rubber heating is not uniform so the surface is rough 6.When the rubber material is hot smelted on the opening mill, the surface is wrapped with air, and the type of rubber material has the phenomenon of hiding air 7.Temperature control is not strict and there are air bubbles on the surface of semi-finished parts How to resolve ? 1.Optimize the production formula, choose easy dispersing type of additives to replace the existing additives, increase the application of dispersant, homogenizing agent and other processing additives, improve the dispersion performance of various additives 2.Mixing rubber using internal mixer two-stage process production, a period of mixing temperature increase, so that the moisture in the raw material is fully volatilize, glue after placing and then two-stage mixing, temperature control in the temperature range of sulfur and accelerator, avoid burning time short or burning 3.Strictly control the placement time of semi-finished products, so that all kinds of additives fully diffuse, improve the uniformity of the rubber material, and is conducive to the recovery of stress and strain under mechanical action 4.The glue hot smelting should be uniform, and the operation mode of separating the glue supply from the type in the hot smelting is adopted to improve the smoothness of the surface of the glue 5.Adopt the extrusion process to extrude the rubber materialand the surface of the type of adhesive material is no longer trapped air phenomenon.

2021-03-30

Why the rubber sealing strip products will appear bubbles？

30

2021-03

How to choose different types of oil seals?

How to choose different types of oil seals? The choice of oil seal should be based on the use of medium and working environment， the sealing medium determines the material of the oil seal,the working environment mainly considers the operating pressure and the working line speed and the working temperature range.Therefore,

2021-03-30

How to choose different types of oil seals?

30

2021-03

Common burr treatment method

Common burr treatment method for silicone rubber products 1.Deburring by hand Manual trimming is a traditional trimming method，It debur by punch die cutting and scissors and a scraper.Manual operation may lead to differences in product quality and speed, so it is necessary to make clear the product parts and technical requirements before deburring, they should master the correct deburring methods and konw how to use the tools correctly.

2021-03-30

Common burr treatment method

30

2021-03

Advantages of silicone rubber

Advantages of silicone rubber： Silicone rubber is a mixture of special silicone rubber and high purity silicon powder, so it has the properties of inorganic and organic materials. Compared with other organic rubber, solid silicone rubber has many advantages:

2021-03-30

Advantages of silicone rubber

30

2021-03

General material of O-rings

General material of O-rings Nitrile butadiene rubber, carboxylic nitrile, fluorine rubber, ethylene-propylene rubber, hydrogenated nitrile butadiene rubber, silicone rubber, neoprene rubber, fluorosilicone rubber, polyurethane, chlorol rubber, styrene butadiene rubber, butyl rubber, natural rubber, ethylene/ethylpropionate rubber, polyacrylate rubber, perfluorine rubber and so on  

2021-03-30

General material of O-rings

30

2021-03

Silicone rubber mold maintenance

Silicone rubber mould maintenance is very improtant for its good work, to ensure that the quality of the stamping parts qualified, to avoid the occurrence of accidents, to extend its service life, to ensure the normal production. The main forms of mold's failure 1.abrasion 2.breakag(Include cracking, chipping, chipping, falling pieces and peeling) 3.plastic deformation  In order to ensure the quality of stamping parts and prolong the service life of the die, it is necessary to clean and clean the mold 1)Daily cleaning Dust cleaning of mold surface:After wiping with a clean cloth, touch the surface of the mold with your hand, until you can't feel the dust 2)Mold guide sleeve, guide pillar cleaning:Use a rag to wipe the oil block of the guide sleeve, guide pillar and guide block, and then wipe with a small amount of oil to lubricate 3)Clean the punching area:Use a hammer to remove all the waste materials in the hole and the waste materials stuck on the slide plate and the scrap materials at the cutting edge 4)For moulds with coatings, the stretched surface of the moulds must be cleaned, and the surface must be confirmed by hand. The first piece of material in production must be wiped clean with a rag. After production, the moulds must be coated with a little oil Clean up regularly 1)The surface of the mould must be cleaned after the mould is repaired 2)In the regular maintenance process, the outer surface of the mold, disassembly, replacement parts are thoroughly cleaned 3)Every once in a while, the mold must be completely dismantled, and then all the goods must be cleaned

2021-03-30

Silicone rubber mold maintenance
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