Company News_Wuxi Tengyu Environmental

2021-07

Calculation of the processing capacity of a kneader

Total volume of the internal mixer - the volume of the cavity formed by the mixing chamber, side brackets (or retaining rings), discharge door, and pressure plate, minus the volume of the two rotors in the mixing chamber. It is the main parameter indicating production capacity and is generally adopted according to series standards.

2021-07-26

2021-07

Open mill and closed mill mixing technology

I. Open mill mixing technology The mixing process includes three aspects: Three processes: Open mill mixing can be divided into three stages: ① wrapping roller ② powder feeding ③ turning

2021-07-26

Open mill and closed mill mixing technology

2020-11

What precautions should be taken when using a two-roll mill?

What should be noted when using a two-roll mill? A two-roll mill, also known as a plastic pressing machine, is mainly used for experimental pressing and color matching tests. Please note the following when pressing: 1. Do not allow the surface of the two rollers of the mill to be scratched by hard objects: Some manufacturers reuse materials, which may contain impurities such as stones and iron filings. These must be cleaned thoroughly to avoid damaging the surface of the rollers. If the roller surface is accidentally scratched, the pressed sheets will not be smooth and flat, affecting color matching or testing. 2. There are techniques to setting temperature stability: For example, at 150 degrees, do not set it to 150 degrees at once. This will cause rapid heating, but the stability will be slower. Start by setting it to 120 degrees, and then increase the temperature until it reaches 150 degrees, at which point it will stabilize quickly. 3. Understand the forward, reverse, and emergency stop functions of the two-roll mill, and do not panic in emergencies. When using the mill, pay special attention to safety. In case of any dangerous situation, immediately press the "emergency stop" or "roller reversal" button to stop the machine or reverse the rollers. 4. When the experiment is completed and the sample is taken, use wooden or bamboo products to remove the sample. Do not use metal products to scrape the surface of the two rollers to avoid damaging the surface. After the sample is made, clean the roller surface with a cotton cloth and apply the appropriate protective oil to facilitate normal use next time. The temperatures of the two rollers of the mill are controlled separately. Set the appropriate temperature according to the needs to facilitate convenient, fast, flat, and smooth sheet production. The product structure is reasonably designed, and consumables are easy to replace. Buyers can replace them themselves. The machine has forward, reverse, and emergency stop functions to ensure the safety of the operator. This mill should be placed in a well-ventilated and dry place to extend its service life. Be sure to clean the two rollers of the two-roll mill. Generally, clean them with a cotton cloth and then apply machine oil to the surface for protection to facilitate the next use.

2020-11-05

2020-10

How to operate a kneader!

1. Calculate the single batch amount of rubber and the actual formula according to the capacity of the internal mixer chamber and the appropriate filling factor (0.6～0.7); 2. According to the actual formula, accurately weigh the amount of each raw material in the formula. Place the raw rubber, small materials (ZnO, SA, accelerator, antioxidant, solid softener, etc.), reinforcing agent or filler, liquid softener, and sulfur separately and arrange them in order on the shelf; 3. Turn on the power switch and heating switch of the internal mixer for preheating. At the same time, check whether the air pressure, water pressure, and voltage meet the process requirements, and check whether the temperature measurement system, timing device, power system indication, and record are normal; 4. After the internal mixer is preheated, stabilize it for a period of time and prepare for rubber mixing; 5. Lift the upper plug, put the raw rubber cut into small pieces into the internal mixer from the feeding port, lower the upper plug, and mix the rubber for 1 min; 6. Lift the upper plug, add small materials, lower the upper plug and mix for 1.5 min; 7. Lift the upper plug, add carbon black or filler, lower the upper plug and mix for 3 min; 8. Lift the upper plug, add liquid softener, lower the upper plug and mix for 1.5 min; 9. Discharge the rubber, measure the temperature of the rubber with a thermocouple thermometer, and record the initial temperature of the mixing chamber, the temperature of the mixing chamber at the end of mixing, the discharge temperature, the maximum power, and the speed of the rotor; 10. Adjust the roll gap of the internal mixer to 3.8 mm, turn on the power switch to make the open mill run, open the circulating water valve, then put the rubber discharged from the internal mixer onto the open mill to wrap the roll. After the rubber temperature drops to below 110 ℃, add sulfur, cut the knife twice on the left and right sides, wait until the sulfur is completely absorbed, the surface of the rubber is relatively smooth, and then cut off the rubber. 11. Adjust the roll gap of the internal mixer to 0.5 mm, put in the rubber for thin rolling, make a triangle package, thin roll 5 times, adjust the roll gap to about 2.4 mm, put in the rubber for roll wrapping, wait until the surface is smooth and free of bubbles, take off the sheet, weigh the total mass of the rubber, place it on a flat, clean metal surface and cool to room temperature, paste a label indicating the rubber formula number and mixing date, and leave it for later use.

2020-10-22

2020-09

Characteristics and advantages of kneading in a Banbury mixer

Characteristics of Internal Mixer Mixing Mixing rubber and various compounding agents in the high-temperature, high-pressure internal mixer mixing chamber, after a short period of kneading, dispersion, and mixing, the required mixed rubber can be obtained. The mixing process is: lifting the top ram → adding materials → lowering the top ram → pressurizing and mixing → mixing completion → opening the bottom ram → turning over → discharging → returning to the original position → closing the bottom ram. Advantages of internal mixer mixing: ① Short mixing time, high production efficiency, and good quality of mixed rubber; ② Large rubber loading capacity, high degree of automation of mixing and other operations, low labor intensity, and safe operation; ③ Small loss of compounding agents, small pollution, and hygienic workplace. Disadvantages of internal mixer mixing: ① The internal mixer is slow to dissipate heat, and the mixing temperature is difficult to accurately control. For rubber materials sensitive to temperature, scorching is easily produced during mixing, and the cooling water consumption is large; ② The mixed rubber is in an irregular block shape and must be subjected to supplementary processing such as pressing; ③ Internal mixer mixing is not suitable for light-colored rubber materials, special rubber materials, rubber materials with frequent changes in varieties, and rubber materials sensitive to temperature. Mixing Methods of Internal Mixer The mixing methods of internal mixers include one-stage mixing, two-stage mixing, feeding method, and reverse mixing method. (1) Working Stages of Internal Mixer Mixing Internal mixer mixing is divided into three stages: wetting, dispersion, and kneading. (2) BIT Value In the internal mixer mixing process, the wetting and dispersion stages play a leading role in mixing. In production, the mixing performance of the rubber material is often measured by the time required for the compounding agent to be uniformly dispersed in the rubber material. Generally, the end time of dispersion is taken as the second power peak point appearing on the mixing time-power curve, which is called the Black Ink Time (BIT) value. The smaller the BIT value, the better the mixing performance of the rubber material, that is, the easier it is to mix. (3) Cooling and Standing a. Cooling is to avoid scorching and mutual adhesion caused by high temperature of the mixed rubber. Generally, it is cooled strongly to below 35℃. b. Standing allows the stress of the rubber molecules to relax, reducing shrinkage. It also allows the compounding agents to continue to disperse, and the carbon black and rubber to further combine, improving the physical and mechanical properties of the rubber material. Rapid Inspection of Internal Mixers Controlling and ensuring the quality of mixed rubber is one of the key links in the production of rubber products. Rapid inspection is a rapid quality inspection of mixed rubber. The rapid inspection method is to take one sample from the front, middle, and rear parts of each batch of mixed rubber during the sheeting process, and determine its plasticity, vulcanization characteristics, hardness, tensile strength, elongation at break, permanent set, and density, etc., and compare the measured results with the specified standard values to determine whether the quality meets the requirements. The inspection methods for the relevant items can be found in the corresponding national standards.

2020-09-29

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