How to choose the right rubber mixing mill for a specific application?
In the rubber industry production process, if the enterprise chooses a rubber mixing mill suitable for a specific application to meet its own production needs, Qingdao Beishun Environmental Protection Technology Co., Ltd. comprehensively evaluates material properties, production requirements, process parameters and equipment performance from the following aspects according to the needs of customers in different industries. The following is a key selection guide:
I. Core parameter selection
A. Roller size and capacity matching
1. For laboratory/R&D: Select 6~10 inch rollers (capacity 1~5kg/batch), such as φ150mm×300mm specifications.
2. Small batch production in small factories: With a small kneading mill, you can choose 12~16 inch rollers (capacity 10~30kg/batch), such as φ400mm×1000mm.
3. For tire factories or mass production: It needs to be matched with an internal mixer. The open mixer is only used for auxiliary sheeting or hot refining. You can choose 22-24 inches or larger models. The size of the machine needs to be matched according to the output.
B. Roller material and surface treatment
1. Roller material: chilled cast iron roller
2. High corrosion resistance/easy cleaning requirements: chrome-plated rollers (such as silicone, rubber containing corrosive additives), the hardness is usually 72-75 Shore
C. Temperature control and heating/cooling methods
1. High temperature control accuracy requirements (such as precision mixing): electric heating (±2℃ accuracy)
2. Heating and cooling methods: steam heating or oil heating (good high temperature stability), there is a cooling pipe inside the roller to circulate cold water to reduce the roller temperature.
D. Roller speed ratio and shear force
The standard speed ratio is 1:1.2~1.4. The larger the speed ratio, the stronger the shear force (suitable for high-dispersion mixing), but the energy consumption increases.
High-hardness rubber (such as hard seals): choose a low speed ratio (22-45r/min)
| Application Scenarios |
Recommended Configuration Points |
| Tire Manufacturing |
The length of the roller barrel ≥ 1000mm, equipped with an automatic material - turning device to ensure uniform dispersion of tread rubber and cord rubber. |
| Rubber Products (Sealing Strips, Shoe Materials) |
Select variable - frequency speed - regulating models, which can flexibly adjust the roller distance (0.5 - 3mm) and temperature to adapt to rubber materials of various hardnesses. |
| Heat - Sensitive Rubber Materials (Such as Nitrile Rubber) |
Control the roller temperature ≤ 60°C to avoid scorching; preferably select hydraulic distance - adjusting for rapid heat dissipation. |
| Plastic Modification (PVC/TPE) |
Small - sized machines (6 - 10 inches) + chrome - plated roller barrels, which are anti - sticking and easy to clean residues. |
III. Key functions and safety
1. Convenience of operation
Multi-recipe debugging: select automatic stock blender device to reduce manual operation.
Precision mixing: frequency conversion speed regulation + digital temperature control system 25 is required.
Safety protection
2. Necessary configuration: emergency brake button (brake distance ≤ 10cm), infrared sensor protective cover.
3. High temperature operation: prevent excessive temperature, emergency cooling system to prevent material scorching and sticking to the roller.
4. Economic considerations
Small and medium-sized factories: open mill is the main force (low investment, wide application), avoid blindly selecting large internal mixers.
Long-term cost : Although the initial price of chrome-plated rollers is high, they are highly wear-resistant and reduce the frequency of maintenance.
Summary : Prioritize matching material properties (such as heat sensitivity, hardness), production scale (batch capacity) and process goals (dispersion, temperature control accuracy), and select roller parameters, temperature control methods and auxiliary functions in combination with safety and economy. For example, when producing colored silicone soles, it is advisable to choose a 10-inch chrome-plated roller + electric heating model, while the auxiliary pressing in the tire factory requires a 16-inch or larger roller with an automatic material turning device.
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