22-inch open rubber mixing machine -550 open mill

Mixing process/Mixture production process

Main process flow: processing of compounding agent→Weighing of rubber and compounding agent→mixing→Lower Cooling Storage→Quick inspection of rubber material.

Processing and weighing of 1. compounding agents:

The rubber and compounding agents used in rubber products are prepared and processed in accordance with the technology.FormulaThe process of weighing and matching is called processing and batching process.

1Processing of raw materials:

(1)Natural glue to bake glue, equipped with baking glue room, large pieces cut into small pieces.

(2)The purpose of the processing and preparation of the compounding agent: to ensure the quality of the compounding agent.,Easy to mix the process operation, improve the mixing dispersion effect.,Achieve automated conditions,Manufactured glue.

(3)Processing method of compounding agent:

--Crushing: according to certain quality standards will be large particles crushed or ground.

Objective: To increase the contact area between the compounding agent and the raw rubber, to facilitate the mixing and dispersion of the compounding agent.

 

--Drying: Heat and dry the compounding agent in a specially designed greenhouse or dryer.

Objective: To remove and reduce the water and low volatile impurities in the compounding agent to ensure the quality of the compounding agent. Because too much water is easy to agglomerate, it is not conducive to dispersion in the mixing process, resulting in uneven mixing.

--Screening: use various screen equipment to screen the compounding agent. 

Purpose: to remove large particles of debris. 

--Melting, filtering and evaporative dehydration: heating and melting of easy-to-melt solids and viscous liquids, removing impurities through screens, and evaporative dehydration for liquid softening.

Purpose: Remove water.

 

22. Weighing and blending of compounding agent:

（1) in accordanceFormulaSpecies, specifications and quantity of the specified compounding agent, as perFormulaSeparately weighing is required.

This process is critical to the quality of the compound. Such as missing, mismatch, does not meet the weighing tolerance. More matching, less matching, etc.

（22) Operating requirements for weighing and coordination. 

aThe material is accurate.

bAccurate weighing.

cNo missing matches and mismatches.

 dNot much match and less match.

E. g. Accuracy requirements for weighing balances for vulcanizing agents and accelerators1-5g.

（31) Aspects to be paid attention to in the batching process:

aPay attention to moistureproof, and store the compounding agent in a dry area.

 bSome compounding agents such as magnesium oxide (MgO), calcium oxide (CaO), a chemical reaction will occur after encountering water, which changes the performance of the compounding agent itself. So in the ingredients and storage process must pay attention to waterproof, appear clumping can not be used.

cFire prevention, such as sulfur should pay special attention to, electrical switches are not allowed to store, raw rubber andCBAlso pay attention to fire prevention. Pay special attention to electric and gas welding.

dAnti-mixing materials, because there are many raw materials in the matching room, and some have similar appearance and are easy to mix materials, must be stored in a fixed position with obvious signs. Drugs that are not marked cannot be used and must be determined by sampling tests before they can be used.

 

2. mixing process:

1The processing process of mixing raw rubber and various compounding agents evenly through a special rubber mixing machine is called mixing process. After mixing processing made of rubber compound called mixed rubber.

Mix purpose:

（1) The physical and mechanical properties of the preparation are uniform and consistent, reaching.Formularequirements.

（21) Improve the processing performance of the rubber compound to meet the processing requirements of the post-process.

（3) Reduce costs and meet product quality requirements.

（4) Improve the performance of rubber products. 

24. Quality requirements of compound:

（11) Ensure that all quick inspection indexes of the rubber compound are qualified.

（2) Good processing performance.

（3) Ensure that the finished product has good physical and mechanical properties.

3Production of qualified compound shall meet the following requirements:

（12) The compounding agent is evenly dispersed to avoid agglomeration.

（2) Make the compound have specific viscosity and scorch value to ensure the safety and smooth progress of various processes.

（3) To make the raw rubber and reinforcing agent produce a certain amount of combined rubber, there is a good reinforcing effect. The main reinforcing agent isCB,SiO2.nH2O(white carbon black).

 （42) On the premise of ensuring the quality of the compound, shorten the mixing time as much as possible, reduce the power consumption and avoid over-refining.

4The mixing of rubber is a rubber mixing production line composed of internal mixer, upper auxiliary machine and lower auxiliary machine.

（12) The auxiliary machine is a device for storing, weighing and transporting raw materials such as powder, liquid, granule and block into the internal mixer.

（2) The lower auxiliary machine is a series of devices that press the rubber material discharged from the internal mixer until the laminated sheet is cut. 

The auxiliary machine is matched with the internal mixer. There are four types of weighing and conveying devices: carbon black, oil, powder medicine and raw rubber. The main ones areaThe carbon black conveying device, I .e.CBthe private room,CBIt is driven into the storage tank by wind pressure, put into the hanging automatic scale according to the variety, and then put into the internal mixer.bLiquid softener delivery system.CSmall medicine weighing system, with low melting point polyethylene packaging bag, packaging, and then put into the mixer. There are two forms of auxiliary machines,AOpen mill;B: Twin-screw extruder, generally used to press the film of the masterbatch.