The Tolerance Control of PU Puncture Proof Tires
The chemical reaction of PU material is an exothermic reaction process. During the puncture proof tire production process, the heat will be transferred to the mold, which will increase the mold temperature. The higher the temperature is, the greater the foaming ratio will be; In the production process of PU material, the material is in the continuous mixing state in the material cylinder, the mixing process will bring in air, and the density of the material will also decrease. Therefore, there will be changes in three technical indexes for PU puncture proof tire products:
1. The PU tire weight will have a tolerance of + / - 25g. In this tolerance range, the product can be controlled, and the tolerance also meets the requirements of pu tire quality standards;
2. The hardness value of the puncture proof tire is within the tolerance range of + / - 5 Shore A. In this tolerance range, the product can be controlled, and the tolerance also meets the requirements of the PU tire quality standard;
3. PU puncture proof tire size (tolerance of outer diameter + / - 3.5mm, tolerance of tire width + / - 3mm), within which the product can be controlled, and the tolerance also meets the requirements of tire quality standards.
