Intimidation:
As we all know, rubber is milky white and turns black because of the addition of various elements such as carbon black. The process of adding chemicals is called banburying.
The environment of the workshop in banbury is very poor, and the smell is too strong. Most people can only work for three years, otherwise there will be sequelae.
Pirelli's raw rubber is all imported natural rubber, which is sent to R&D quality appraisal center and then sent to internal mixer (imported from Germany). Input formula (unique to Pirelli) and add various elements, such as particles and carbon black, to make special rubber for each tire part. All waste products with slight impurities. It is forbidden to trample on rubber in banbury workshop. Once found, it will be fired immediately. Once someone fell asleep at night and was caught in a blender. As a result, ...
This process is like steaming the dough of steamed bread.
Semi-forming:
The most important link, the most complicated workshop of the machine, I work in this workshop as a member of the engineering department.
All kinds of glue in the internal mixing workshop are sent here.
Steel press: Rubber, fiber cord fabric and steel cord fabric are completely combined by extruder and calender, then sent to cutting machine for cutting, and then cut into cords with different angles and sent to molding workshop.
If there is a little bubble, this roller blind cloth is invalid. Nearly ten thousand yuan of raw materials became waste. The process requirements are very strict, and the allowable error of cutting joint is 1mm, otherwise it is invalid. The steel press is imported from Italy, and the cutting machine is imported from VMI company in the Netherlands. This job is very dangerous. Someone once pointed a finger at Pirelli on this machine. Steel wire is made of special materials and is toxic. After piercing the skin, the wound itches. The steel wire is about 0.3 mm in diameter, golden in color and extremely tough.
Ternary compound and binary compound: the rubber sent from the mixer workshop is further refined by three extruders to form the tread. The original desktop has no patterns, only four embryonic drainage grooves. The colored lines and numbers you see on the new tires are printed here for marking. Curled and sent to the molding workshop. Double compound is a machine for producing rubber on sidewall surface, and the principle is the same.
Triple compounding and double compounding are because three and two different adhesives are completely mixed together to produce adhesives for tabletops and side walls.
Triangle contrast: rubber is also sent from the mixer workshop, where it is made into a rubber machine combining sidewall and traveler by extruder, which is the key to tight contact between tire and rim. It is also the key to vacuum tire sealing.
Ferrule: the key skeleton of the tire toe. 10 is a traveler surrounded by a single steel wire, which is the origin of the so-called1516171819 20 inch tire. Allowable error: 2 mm in diameter. Otherwise XX.
Glue applicator: a simple machine for preliminarily gluing triangle glue and traveler. And then sent to the molding workshop.
Lining: Two extruders produce the innermost lining and transition layer rubber of the tire. The key to tire gas retention. The products produced by this machine are extremely strict in inspection, and a little bubble in an airtight layer is invalid. Imported from Italy. The structure is very complicated, so far the machine has broken down and can't be repaired.
Zero belt: Pirelli's patented binding technology makes the carcass stronger. Small extruder, 10,000 meters of products per hour. High-quality nylon yarn firmly binds the inside of the tire. This technology is a patent of Pirelli, and it is an essential component to ensure the internal stability of the car at high speed. This machine has high temperature requirements and was transplanted to the molding workshop.
In a word, the semi-molding workshop is the most difficult and the most stringent, because it involves many parts and products. Rubber becomes ripe rubber after more than 10 minutes in the extruder head, which is invalid. There are many conditions to consider, such as temperature, humidity, bubbles, and the most critical and rigorous is size.
This process is like cutting noodles. How many noodles do you need for each steamed bread?
Molding workshop:
Parts produced in the semi-molding workshop are sent here, and each part is arranged in sequence in the molding machine: fiber layer (narrow), sidewall, liner, fiber cord, steel cord, crown belt and tread.
Hang the traveler. The forming machine automatically extrudes the green tire. At this time, the tire has already taken shape, but it is still raw rubber. The workshop is 20 degrees all the year round and cool. . The machines are all VMI in the Netherlands, and the degree of automation is super high. So the steamed bread is ready, and then the steamed bread is steamed.
Vulcanization: Before the green tire is vulcanized, a layer of release agent should be sprayed on the lining to prevent the vulcanizer capsule from sticking to the lining. The release agent for new tires still exists. You can touch the inner lining of the new tire with your hands. Are your hands as greasy as lead powder? Ha ha. After spraying, it is sent to a vulcanizing machine for vulcanization. The curing temperature is several hundred degrees, and it will be OK in 20 minutes. The steamed bread is out of the pot ~ ~ ~ Hehe, steamed bread with patterns.
Finished product inspection warehouse: equivalent to the strictness of semi-molding workshop. Judging tire defects by X-ray irradiation and photography. For example, the staggered seam cut by the cutting machine exceeds 1mm, which is invalid. The patterns, specifications and numbers vulcanized by Pirelli and vulcanizing machine are missing corners and slightly flawed, and all of them are invalid.
The tires that pass the inspection are put into storage and waiting for delivery and export.