Weekly topic: 8 Wealth points for those who answer correctly, 2 Wealth points for participation； Question 113
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Q&A: What is rubber mixing, and what process conditions need to be controlled when mixing using an open mill and an internal mixer respectively? Answer: Mixing refers to the process of uniformly blending various additives with raw rubber or vulcanized rubber that has the desired plasticity, under mechanical action, to produce mixed rubber. What are the process conditions that need to be controlled during mixing in an open mill? 1. Rubber loading capacity; 2. Roller spacing; 3. Mixing temperature; 4. Mixing time; 5. Roller speed and speed ratio; 6. Loading sequence. What are the process conditions that need to be controlled when mixing in a internal mixer? 1. Rubber loading capacity; 2. Pressure of the plunger; 3. Rotator speed and mixing time; 4. Mixing temperature; 5. Loading sequence
Answer: The process parameters include (1) glue loading capacity, (2) roller spacing, (3) mixing temperature, (4) mixing time, (5) roller speed and speed ratio, (6) feeding sequence； The process conditions that need to be controlled when using an internal mixer for mixing separately include: (1) the amount of rubber to be mixed, (2) the pressure of the plunger, (3) the rotor speed and mixing time, (4) the mixing temperature, and (5) the order in which materials are added
In the rubber industry, the most commonly used vulcanization methods are mechanical vulcanization and chemical vulcanization. The main equipment used in mechanical kneading methods includes open-type rubber mixers, closed-type rubber mixers, and screw kneaders. Chemical plasticization is a method that involves adding chemicals during the mechanical plasticization process to enhance the plasticizing effect. During plasticization in an open mill, the temperature is generally below 80°C, making it a low-temperature mechanical mixing method. The degumming temperature for internal mixers and screw mixers is above 120°C, and can even reach 160–180°C; this constitutes high-temperature mechanical mixing. Plasticizing properties of several types of rubbers: When natural rubber is plasticized using a banbury mixer, the roller temperature is 30–40°C, and the processing time is approximately 15–20 minutes ； When using an internal mixer for plasticization, the temperature should be above 120°C, and the processing time is approximately 3–5 minutes. The Mooney viscosity of styrene-butadiene rubber is generally between 35 and 60; therefore, it is not necessary to vulcanize styrene-butadiene rubber. However, vulcanization can improve the dispersion in the mixing machine. Butadiene rubber exhibits cold flow properties and does not benefit from vulcanization. Styrene-butadiene rubber has a low Mooney viscosity, so plasticization is not required. Neoprene has high plasticity; it can be passed through the mill 3–5 times before plasticization, with the temperature for this process ranging from 30 to 40°C. The molecular backbone of EPDM is saturated, so plasticization does not easily cause molecular cleavage; therefore, it is necessary to choose grades with low Mooney viscosity and avoid plasticization. Nitrile rubber has low plasticity, high toughness, and generates a lot of heat during plasticization. During kneading, it is advisable to use a low temperature of below 40°C, a small roller spacing, a low capacity, and segmented kneading, which will yield better results.
What is rubber mixing, and what process conditions need to be controlled when mixing using an open mill and an internal mixer respectively? Mixing: The process of uniformly mixing various additives with raw rubber or compounded rubber that has the desired plasticity, under mechanical action, to produce compounded rubber. Process conditions for mixing in an open mill: 1. Rubber loading capacity; 2. Roller spacing; 3. Mixing temperature; 4. Mixing time; 5. Roller speed and speed ratio; 6. Loading sequence. Process conditions for mixing in a internal mixer: 1. Rubber loading capacity; 2. Pressure of the plunger; 3. Rotator speed and mixing time; 4. Mixing temperature; 5. Loading sequence
Mixing is the process of uniformly combining various additives with raw rubber or vulcanized rubber that has the desired plasticity, under mechanical action, to produce compounded rubber. The process conditions that need to be controlled during mixing in an open mill include: rubber loading capacity, roll spacing, mixing temperature, mixing time, roll speed and speed ratio, and feeding sequence. The process parameters that need to be controlled when using an internal mixer for mixing separately include: the amount of rubber to be mixed, the pressure of the plunger, the rotor speed and mixing time, the mixing temperature, and the order in which materials are added.
What is rubber mixing, and what process conditions need to be controlled when mixing using an open mill and an internal mixer respectively? Answer: Mixing is the process of uniformly combining various additives with raw rubber or vulcanized rubber that has the desired plasticity, under mechanical action, to produce compounded rubber. The process conditions that need to be controlled during mixing in an open mill are: (1) rubber loading capacity, (2) roll spacing, (3) mixing temperature, (4) mixing time, (5) roll speed and speed ratio, (6) feeding sequence. The process conditions that need to be controlled when mixing in a internal mixer are: (1) rubber loading capacity, (2) plunger pressure, (3) rotor speed and mixing time, (4) mixing temperature, (5) feeding sequence
Mixing is the process of uniformly combining various additives with raw rubber or vulcanized rubber that has the desired plasticity, under mechanical action, to produce compounded rubber. The process conditions that need to be controlled during mixing in an open mill are (1) rubber loading capacity, (2) roll spacing, (3) mixing temperature, (4) mixing time, (5) roll speed and speed ratio, and (6) feeding sequence. The process conditions that need to be controlled when mixing in a internal mixer are (1) rubber loading capacity, (2) plunger pressure, (3) rotor speed and mixing time, (4) mixing temperature, and (5) feeding sequence
Answer: Mixing is the process of uniformly combining various additives with raw rubber or vulcanized rubber that has the desired plasticity, under mechanical action, to produce compounded rubber. The process conditions that need to be controlled during mixing in an open mill are (1) rubber loading capacity, (2) roll spacing, (3) mixing temperature, (4) mixing time, (5) roll speed and speed ratio, (6) feeding sequence ； The process conditions that need to be controlled when using an internal mixer for mixing include: (1) the amount of rubber to be mixed, (2) the pressure of the plunger, (3) the rotor speed and mixing time, (4) the mixing temperature, and (5) the order in which materials are added
What is rubber mixing, and what process conditions need to be controlled when mixing using an open mill and an internal mixer respectively? Mixing is the process of uniformly combining various additives with raw rubber or vulcanized rubber that has the desired plasticity, under mechanical action, to produce compounded rubber. The process parameters for starting the mixing process are: 1. Rubber loading capacity 2. Roller spacing 3. Mixing temperature 4. Mixing time 5. Roller speed and speed ratio 6. Loading sequence. The process parameters for controlling the internal mixer are: 1. Rubber loading capacity 2. Pressure of the top plunger 3. Rotor speed and mixing time 4. Mixing temperature 5. Loading sequence
Answer: Mixing is the process of uniformly combining various additives with raw rubber or vulcanized rubber that has the desired plasticity, under mechanical action, to produce compounded rubber. The process conditions that need to be controlled during mixing in an open mill are (1) rubber loading capacity, (2) roll spacing, (3) mixing temperature, (4) mixing time, (5) roll speed and speed ratio, (6) feeding sequence ； The process conditions that need to be controlled when using an internal mixer for mixing separately include: (1) the amount of rubber to be mixed, (2) the pressure of the plunger, (3) the rotor speed and mixing time, (4) the mixing temperature, and (5) the order in which materials are added
The mixing of rubber involves combining various additives with raw rubber or vulcanized rubber that has the desired plasticity, using mechanical forces to blend them evenly and thus create compounded rubber. The process conditions that need to be controlled during mixing in an open mill are: (1) rubber loading capacity, (2) roll spacing, (3) mixing temperature, (4) mixing time, (5) roll speed and speed ratio, (6) feeding sequence ； The process conditions that need to be controlled when mixing with a internal mixer include: (1) the amount of rubber to be mixed, (2) the pressure of the plunger, (3) the rotor speed and mixing time, (4) the mixing temperature, (5) the order of adding materials