Image Name

26

2021-07

The working principle of a kneader

A kneader is a machine that uses a pair of rotors with specific shapes that rotate relatively to each other. Under adjustable temperature and pressure in a closed state, it intermittently plasticizes and mixes polymer materials. Below, Xiaan.com's editor will detail the working principle, structure, uses, operation methods, and precautions of the kneader.

2021-07-26

26

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

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

26

2020-11

What are the mixing principles of an open mill?

What are the mixing principles of an open mill? The mixing process of an open mill generally includes three stages: wrapping, feeding, and mixing. (1) Wrapping Several states of rubber in an open mill: 1—Rubber is difficult to enter the roll gap; 2—Tightly wrapped around the front roll; 3—Forms a bag-like shape after leaving the roll; 4—Viscous flow wrapping the roll (2) Feeding Before the rubber is wrapped around the roll and the compounding agents are added, an appropriate amount of rubber should be accumulated at the upper end of the roll gap. Appropriate accumulation is a necessary condition for feeding. (3) Mixing Circumferential direction: Most even mixing; Axial direction: Uneven; Radial direction: Least even Factors Affecting Open Mill Mixing 1. Rubber Loading Capacity The rubber loading capacity should be reasonably determined based on the specifications of the open mill and the characteristics of the rubber compound. Excessive capacity reduces the mixing dispersion effect, increases the mixing temperature, and easily causes scorching, affecting the quality of the rubber compound; insufficient capacity reduces production efficiency. Formula: V—Rubber loading capacity, L; D—Roll diameter, cm; L—Roll length; 2. Roll Gap The roll gap is generally 4-8mm. Reducing the roll gap increases the shearing effect, but also increases heat generation. 3. Mixing Temperature If the roll temperature is too low, the rubber hardness is too high, and the equipment is easily damaged. Increasing the roll temperature helps reduce the viscosity of the rubber and accelerate the mixing and feeding speed, but if the temperature is too high, it can easily cause the rubber to leave the roll and scorch, making it difficult to operate. The roll temperature is generally maintained between 50-60℃ through cooling. However, when mixing rubber compounds containing high-melting-point compounding agents (such as high-melting-point coumarone resin), the roll temperature needs to be appropriately increased.

2020-11-26

What are the mixing principles of an open mill?

05

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

22

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

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