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What causes degumming of polyurethane coated rollers

2020-07-25 09:04:19

In recent years, with the continuous development and growth of modernization, polyurethane rubber-coated wheels have long been used in various occupations. As an important part of load-bearing transportation, polyurethane rubber rollers are important for all occupations. Therefore, polyurethane rubber-coated wheels are used in The medium requirements are very strict. Let’s analyze the basic reasons why the polyurethane coated rollers are used to open the glue:

Rubber coated roller

1. The influence of mold and iron core temperature: In the polyurethane pouring process, the temperature of the iron core and mold is required to be close to the temperature of the polyurethane material. When the temperature difference between the two is large, the curing speed of the material will be uneven, and the result will be greater internal stress after the curing of the polyurethane material.

  2. Mold planning requirements: When mold planning and production, it is required to have good sealing, easy to close, open and demold. When planning the mold, the heat balance of polyurethane should also be considered, which is an important factor that is easily overlooked by manufacturers. If the rubber roller is unevenly heated during the high temperature vulcanization process, the polyurethane vulcanization is usually incomplete at the junction of the iron core and the polyurethane, the strength of the elastomer is low, or cracks appear.

  3. The choice of adhesive is based on the theory of adhesion. The molecular force can be formed between the polymer material with high molecular weight and the appearance of the metal material, so that the material and the metal form a close bond.

  4. Polyurethane formula: The manufacturer of polyurethane rubber-coated wheels should adjust the formula according to the operating conditions, such as load-bearing, speed and operating environment, so as to be more suitable for the operating conditions described by the customer.

  5. The surface treatment of the iron core: the treatment of the iron core. The treatment of the cast iron roll core is also one of the key factors in the core removal of the rubber roller. For the excellent combination of polyurethane elastomer and iron core, it is usually necessary to clean the iron core, such as pickling to remove rust and dirt, etc., so that its appearance is clean and non-stained. Mechanical sandblasting is usually one of the methods for bonding strength.

   The above is the explanation about the use of polyurethane to open the glue. Do you have a better understanding of polyurethane products? Choose a good product to make the polyurethane coated wheels have better wear resistance and longer use time.

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