On September 27, 2011, Kumho China stated that Kumho Tire had no clear time for the end of the tire recall, and the Kumho Tire Free Test, originally scheduled to finish on October 15, will be extended to December 31 this year.
On the 15th of this year, Kumho Tire was caught in the quality door. In the following month, Kumho Tire announced that it had recalled 302 batches of tires from 7 batches produced from 2008 to 2011 and provided free testing services to Kumho users. Kumho staff introduced that the recall work of Kumho is still continuing. According to the information on the official website of Kumho, the scheduled time for the free testing service was April 15, 2011 to October 15, 2011, and now it has increased by more than two months, extending to December 31st. The warranty period of the tires is changed from 3 years to 5 years, ie products within 5 years from the production date. If there are quality problems, commercial claims from Kumho can be obtained for 5 years.
The glue with good performance also has a large change in melt viscosity with temperature. Specifically: when the use temperature rises above 150 degrees, the melt viscosity of the glue can be quickly reduced, so that the coating can maintain proper permeability; and when the temperature of the glue is lowered, the viscosity of the glue can quickly increase. , and quickly solidifies, thus ensuring the effect of rapid limb binding. Hot melt adhesives can maintain good permeability only if they have a suitable melt viscosity, which is very important for glue binding. But too low melt viscosity will cause insufficient amount of glue on the back of the book. The melting degree of hot melt adhesive is more suitable in the range of 4000-5000 centipoise. Good adhesion and penetration performance, that is, when the equipment is running at high speed, the glue must be able to quickly infiltrate the spine of the book, and have excellent cohesion, which can ensure "no wire drawing", and will not crack or fall apart after cooling. In order to achieve this goal, changing the composition of the glue is one aspect. The key is to improve the cohesion and toughness of the base resin, and to introduce strong adhesive force, hard quality, low melt viscosity into the composition, and when the temperature changes up and down, Resins that dissolve or set rapidly. Adhesives with good performance should also have good tensile strength. The phenomenon of loose pages, falling pages, and breaking during the use of adhesive books is directly related to the tensile strength of hot melt adhesives. The tensile strength is usually 20-30kg/cm2. Hot melt adhesives must have good elongation. The elongation at break is high, and the toughness of the hot melt adhesive is good; only with good toughness can the book not be easily broken. The elongation requirement is greater than 300%
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