Mold is an important tool used in tire vulcanization process, the mold in the course of the inevitable use of rubber, with agents and vulcanization process used in the release agent of the integrated deposition of pollution (the main pollutants are sulfide, inorganic oxidation Material, silicone oil, carbon black, etc.), repeated use will cause some patterns of pollution dead zone. Therefore, it is necessary to regularly clean the mold to ensure the cleanliness of the surface in order to ensure the quality of the tire and the life of the mold, in view of this, tire mold cleaning technology development industry attention.
Tire Molds There are two traditional cleaning methods:
1.1 mechanical cleaning method
The use of artificial sand or steel wire physical grinding and dry sandblasting, according to the need to use a different combination of cleaning. Mechanical cleaning method is a mature technology, widely used by the tire industry. The method is simple and easy, the equipment, tools are not demanding, but there are insurmountable defects: the mold will cause mechanical damage, shorten the life of the mold; sandblasting easy to plug the mold of the exhaust hole, The work of the stomata is very large. Must be removable mold, resulting in high labor intensity, long cleaning cycle.
1.2 Chemical cleaning method
Chemical cleaning methods include: organic solvent method, melting method, pickling method, alkali washing method. These methods are easy to use and low cost. But the long-term use of the above method will cause mold corrosion, which directly affect the appearance and quality of the product; the same time these pharmaceutical raw materials pollute the environment, damage the health of operators, must have a complete means of labor insurance and pollutant handling equipment. At present, the law is mainly used for small rubber products business.
With the continuous development of science and technology, some new technologies have been developed and applied. These cleaning techniques will bring "revolution" to the tire mill industry that is of concern. But these high investment technology can be accepted by the market, need to be tested. The following article will focus on these new technologies that have been industrialized.
2. New cleaning technology
2.1 laser cleaning technology
Laser cleaning technology is a new type of cleaning technology that has been developing rapidly in the past 10 years. It has gradually replaced the traditional cleaning technology in many fields with its own many advantages.
Laser cleaning technology refers to the use of high-energy laser beam irradiation surface of the workpiece, so that the surface of the dirt, rust or coating instantaneous evaporation or stripping, high-speed and effective cleaning surface cleaning objects or surface coating, so as to achieve a clean process. It is based on the laser and material interaction effect of a new technology, with the traditional mechanical cleaning method, chemical cleaning method and ultrasonic cleaning method (wet cleaning process), it does not need to use any damage to the ozone layer CR Li Xin organic solvents, No pollution, no noise, harmless to the human body and the environment, is a "green" cleaning technology.
Laser cleaning uses a clean substrate (also known as the parent) and the surface attachment (dirt) for a certain wavelength of laser energy, with a very different absorption coefficient. Radiation to the surface of the laser energy, most of the surface attached to the absorption, so that heat or vaporization evaporation, or instantaneous expansion, and by the surface of the steam flow to drive, from the surface of the object, to clean the purpose.
(Sulfur, inorganic oxide, silicone oil, carbon black, etc.) to absorb a lot of energy, is instantaneous expansion, Vaporization, away from the mold surface, so as to achieve the effect of cleaning.
Laser cleaning methods are:
1) laser dry cleaning method, that is, the use of pulsed laser direct radiation decontamination;
2) laser + liquid film method, that is, first in the substrate surface deposition of a layer of liquid film, and then use laser radiation decontamination;
3) laser + inert gas method, that is, in the laser radiation at the same time, with an inert gas purge the surface of the substrate. When the dirt from the surface after stripping, will immediately be blown away from the surface of the gas to avoid surface contamination
Tire mold making method
1, the tire model with a release agent smear evenly, dry. The treated tire model is surrounded by steel plates and the plates are also treated with release agents.
2, silica gel and curing agent stir evenly. Mold silicone appearance is the flow of liquid, A component is silica gel, B component is curing agent. Example: Take 100 grams of silica gel, add 2 grams of curing agent (Note: silica gel and curing agent must be stirred evenly, if there is no mixing evenly, the mold will appear a solid, one is not cured, Will affect the life of the silicone mold and the number of mold times, and even cause mold scrap status.
3, vacuum exhaust bubble treatment: silica gel and curing agent after mixing evenly, vacuum evacuation cycle, vacuum time should not be too long, under normal circumstances, not more than ten minutes, the vacuum time is too long, silicone immediately Curing, resulting in cross-linked to reflect the silicone into a piece, can not be painted or perfusion, so that a waste of silica gel, can only put the silicone into the trash, re-take the silicone to do. 3, with a good glue along a fixed pour point slowly pouring, and from time to time to shock to exclude the air inside.
4,120 minutes after the completion of gel curing, the gypsum powder 1000g watered into the wooden frame, filled up (wood frame application of plastic film is divided into two parts to facilitate demolition).
5,20 minutes after the removal of wood, mold is done.
1, the amount of curing agent should be depending on the temperature, the temperature is reduced. Curing agent used too much, the mold will become harder and brittle; curing agent used too little, the operation time will be extended.
2, in order to prevent changes in silicone properties, it is recommended not to add silicone oil.
3, for your mold to achieve the best results, please put the mold at least 24 hours after use. Tire molds are used for vulcanizing molds of various types of tires.