Trimming of rubber seals is an essential process in the production of rubber products. The quality of trimming process directly affects the production efficiency and quality of rubber seals.

Common trimming methods of rubber sealing ring are as follows:

1. Manual trimming. Manual trimming is the most traditional trimming method, which trims the excess glue edge step by step along the outer edge of the product through manual use of knives. High proficiency is required to reduce the scrap rate of products. The investment of manual trimming is small, and the trimming quality is not efficient and low. It is only suitable for the processing of small batch products.

2. Mechanical trimming. Mechanical dressing is usually applicable to rubber seals with low accuracy requirements. It is common to use a special electric trimming machine with a rotating blade. The blade used should match the size and height of the product. If the inner and outer edges of the product have overflow edges, it can be designed as double-edged and multi edged to achieve one-time completion. The machining accuracy of mechanical trimming is higher than that of manual trimming, and the efficiency is also doubled. Especially for the first mock examination multi cavity products, matching cutters can be designed according to the arrangement and distribution of products. After the product is taken out from the mold, the whole plate can be covered and the punching and cutting can be completed at one time. With the cooperation of heating, dozens of pieces can be repaired at a time. The key is that the punching temperature must be well controlled to prevent adhesion after being too high.

3. Freeze trimming. At present, the low-temperature freezing trimming methods include vibration freezing trimming, swing or shake freezing trimming, drum freezing trimming, brush grinding freezing trimming and shot blasting freezing trimming. Under certain low temperature conditions, rubber will change from high elastic state to glassy state. The rubber that becomes glassy state will harden and become brittle. The speed of hardening and embrittlement is related to the thickness of rubber products. When the O-shaped rubber ring is put into the freezing trimming machine, under a certain low temperature, the thin rubber edge of the product becomes hard and brittle due to freezing, but the product itself will still maintain a certain elasticity. With the operation of the drum, there will be a collision between the products, and the products will have impact and abrasion with shot blasting, abrasives, etc., and the rubber edge will be broken and fall off, so as to achieve the purpose of trimming. The product will restore its original performance at room temperature.

Low temperature freezing trimming has high production efficiency and good economic benefits.