1. Usually the rubber wellington boots are made of rubber as the main raw material, which can be composed of rubber materials, but also other materials such as cloth, leather as auxiliary materials and rubber material combination. In China, the domestic rubber wellington boots manufacturing process is composed of the following processes

•  mixing - natural rubber or synthetic rubber and other rubber raw materials in the rubber cutting machine into a certain weight requirements of the block, and then The plasticity of the rubber is about 0.4-0.5, then according to the needs of different occasions in the above-mentioned rubber mixed with various accelerators, antioxidants, fillers, enhancers, vulcanizing agents, coloring agents and other organic inorganic chemical raw materials, and mixed in the rubber refining machine into a uniform plasticity of 0.4-0.6 or so of the compounding rubber. 

• Film manufacture - The above-mentioned compounding rubber is then extruded into a certain thickness of rubber film by repeated rolling through the extruder. 

• Manufacture - The above-mentioned film of certain thickness is then rolled and cut into films of various shapes and sizes by rolling and cutting machine.

• Forming - the various shapes and sizes of the film will be sent to the molding line, through the manufacture of molding workers, a variety of films according to different requirements on the shoe last with adhesive paste bonding each other into a raw rubber wellington boots.

• Vulcanization - the above-mentioned raw rubber wellington boots and then put into the vulcanization chamber, under the action of a certain temperature, time, pressure three elements for vulcanization, so that it becomes a fixed shape, elasticity, strength, wear resistance.

2. The above technique is called "hot-fit". The above manufacturing process is called the "hot-paste" rubber wellington boots manufacturing process, which is characterized by the fact that the rubber material is not sufficiently cooled (i.e., still in a hot state) after being rolled and shaped into film by the roll cutting machine and then provided to the molding line for the molding of raw rubber wellington boots, so this "hot-paste" rubber wellington boots manufacturing process is often very difficult for the manufacture of raw rubber wellington boots. "

• First of all, due to the continuity of the "hot-paste" process, the rubber film is not sufficiently cooled before being rolled and cut into film, because the raw rubber material changes from hot to cold state to shrink, and the shrinkage rate is quite large. Therefore, the actual size of the film cut into the last is larger than the size of the last, and the excess rubber must be trimmed when forming on the last, which will not only cause the difficulty of alignment, but also often cause the waste of rubber, and finally cause the error of product size and the decline of product quality, and the actual error is always between 2-4m/m. 

• Secondly, the adhesive material has certain stickiness in the hot state, and the surface of the film is often exposed to the air after rolling and cutting, so it is easy to be bruised, rubbed, and even adsorbed with dust and garbage on the adhesive surface, which becomes a kind of pollution and seriously affects the quality of the products. 

• Once again, the hot state film has a certain viscosity, and the manufacturing process of the "hot paste method" can only be rolled and cut layer by layer, forming a running operation, and also due to the slow speed and poor quality of the extruder's film, thus seriously affecting the process and quality of the later processes, such as to improve the output, it is necessary to extend the roll-cutting time, and also Since the molding process of rubber wellington boots requires careful trimming and alignment, all these will directly affect the number of shoes produced per unit time. The above "hot-paste method" process not only seriously affects the quality and quantity of products, but also has low work efficiency, high cost and generally poor economic efficiency.

3. In order to overcome the above-mentioned shortcomings, a "cold-paste" rubber wellington boots manufacturing process was invented to effectively improve the quantity of shoes produced per unit time and improve product quality.

4. The manufacturing process of the "cold-past method" is mainly divided into mixing, film, coating, cooling, manufacture, molding, vulcanization and other processes, which are described in detail below.

• First, the mixing process will be a large block of natural rubber or synthetic rubber cut with a cutting machine for a certain weight of rubber blocks, the rubber blocks into the mixing machine (rubber refining machine) will be plasticized into a certain degree of plasticity spelling with rubber, in these spelling with rubber can be mixed with a variety of accelerators, antioxidants, fillers, enhancers, vulcanizing agents, coloring agents and other organic, inorganic chemical raw materials, and in the mixing It can be mixed with various organic and inorganic chemical materials such as accelerator, antioxidant, filler, reinforcing agent, vulcanizing agent, coloring agent, etc., and mixed in the mixing machine to become a uniform plasticity of about 0.4-0.6. Through the above ratio, it can achieve the performance of various kinds of compounding rubber, to meet the product's various use occasions and customer requirements The above process is basically the same as the existing technology "hot-paste method" manufacturing process.

• Second, the film process through the mixing machine to mix a certain degree of plasticity of the compounding rubber. Then after calendering machine calendering will form a certain thickness of the film. This film can not only have a certain color, (because in the mixing to add the required coloring agent and have a certain color and luminosity), but also through the calendering and the formation of a variety of patterns, a variety of different types or colors, patterns of mixed rubber must be calendered separately to make the film. The said calender rollers using cooling water rollers, so that the temperature of the film calendered by the calender has dropped, to achieve the purpose of the initial cooling, favorable to the next process to improve efficiency. Of course, the above preliminary cooling can also be directly used to stack the natural cooling or a combination of the two ways.

• Third, the coating cooling process in the above through the initial cooling of the surface of the rubber mold coated with a layer of hot melt isolating agent, the isolating agent is usually used in the melting point of 80-90 ℃ zinc stearate or aluminum stearate, due to the layer of isolating agent so that the film surface viscosity is covered, can be placed on top of each other, and has a certain role in protecting the surface of the film. This hot-melt barrier has a barrier effect in the cold state, and melts automatically when the temperature exceeds its melting point. Therefore, after the initial cooling of the previously described film coated with a layer of hot melt release agent, its use is more effective, but in general, if the film directly after calendering machine calendering temperature does not exceed the hot melting point of the release agent can be used directly to coat the process. The above process can also be directly used in the original technology of the extruder instead of the calender of the present invention, but the present invention uses the calender because of the high surface finish of the calender roller, and the calendering speed is faster than the extrusion speed, so the film preparation efficiency is high and the surface finish of the film is good. The film produced by the above process is then stacked and naturally cooled so that the shrinkage of the film is basically reduced to zero before it can be supplied to the next manufacturing process. Due to the different nature of various films (i.e., different ratios), the shrinkage of the film is determined by actual experience, generally after natural cooling to room temperature, and as the film temperature decreases, the shrinkage is gradually reduced.

5. The manufacturing process is carried out on the punching and cutting machine, which is generally equipped with various specially shaped punching knives on the upper part of the hydraulic machine. The multi-layer film of the same type, which is fully cooled and the shrinkage rate is basically reduced to zero, is placed under the hydraulic punching and cutting machine to become a multi-layer film with a certain shape that can be divided into several layers. As a result of the punching and cutting method, the number of films produced greatly exceeds the number of original manufacturing processes, so that the excess films can be put into the transit warehouse for backup, which solves the necking phenomenon of the original process in this process and greatly improves the output of products. Since the shrinkage rate of this multi-layer film is basically reduced to zero, the shape and size of the film are basically the same as those of the last, so there is no need for trimming and other work, which greatly improves the quality and standardization of the product and reduces the cost.

6. Therefore, the film or other auxiliary materials required for each part of the shoe are laminated on the last with lining and pulp, and the film and film of each part and other auxiliary materials are laminated with pulp. Bonding molding. This glue paste is generally modulated by the manufacturer itself, with natural rubber or latex as the main raw material, or commercially available "neoprene" can be used as a substitute.

7. Six vulcanization process of this raw rubber wellington boots must be vulcanized in order to become a finished product, the molding of raw rubber wellington boots will be placed into a special vulcanization room, under the action of certain temperature, time and pressure three elements of vulcanization, so that the internal chemical structure of the fundamental changes, become a fixed shape, with a certain strength, elasticity, wear resistance of shaped products, general vulcanization temperature at 125-135 ℃, the pressure is 2.8-3.5kg/cm2, time in 50-60 minutes, because the surface of raw rubber wellington boots also has a residual hot melt isolate, this isolate in the above-mentioned vulcanization temperature will quickly melt away, and finally get the product with a clean and bright surface. The manufacturing process of the above-mentioned rubber wellington boots is called the cold-paste method in comparison with the prior art.

8. The "cold paste method" is an improvement to the "hot paste method". It not only retains some features of the existing process, but also corrects the necking process which affects the quality and quantity of the product, thus greatly improving the quality of the product and the standardization procedure, increasing the quantity of the product formed per unit time, reducing the cost, and making the economic efficiency of the enterprise significantly improved.