The rubber mixing mill is a machine with exposed rollers used in rubber factories, mainly for preparing plasticized rubber, mixed rubber, or performing hot mixing and molding. It is an essential equipment for the processing of rubber products. The following section provides a detailed introduction to the working principle, main components, main uses, advantages and disadvantages, and technical parameters of the rubber mixing mill.

The rubber mixing mill works by squeezing and shearing the rubber through two relatively rotating rollers. During this process, the original macromolecular chains of the rubber are broken, resulting in reduced elasticity and improved plasticity of the rubber. This enhances the subsequent processing steps and improves the quality of rubber products.

The rubber mixing mill comprises different parts such as mixing part, feeding part, pressing part, discharging part, transmission device part, heating, and cooling system, electronic control system, and lubrication system. These parts play specific roles in the rubber mixing process and contribute to the overall performance of rubber mixing mill.

• Mixing part: This part mainly comprises rotor and internal mixing chamber along with sealing device. The roller is the core component, which directly undertakes and completes the kneading of materials.
• Feeding part: It constitutes a feeding chamber, a bucket-shaped feeding port, and a flap door. The flap door is used for feeding and instant storage.
• Pressing part: A pressing device is usually inbuilt to apply certain pressure to the rubber material, which accelerates the rubber mixing process and improves its overall effectiveness.
• Discharging device part: This is used to discharge the rubber material once the rubber mixing process is completed.
• Transmission device part: It comprises the motor, elastic coupling, reducer and gear coupling among others to transmit power, which enables the roller to overcome the working resistance and rotate, thereby completing the rubber mixing operation.
• Base: This includes the main machine base and transmission base, on which the main machine and transmission system components are installed.
• Heating and cooling system: The heating and cooling system comprises pipes and distributors that can pass cooling water or steam into the cavity of the roller for circulation and temperature control of the rubber material.
• Electronic control system: This is composed of a control box, operating machine, and various electrical instruments, providing the operation center of the entire machine.
• Lubrication system: The lubrication system is composed of an oil pump, oil distributor, and pipeline, injecting lubricating oil into each rotating part for reducing the friction between moving parts and extending the service life of the mixing mill.

The rubber mixing mill can be used for various purposes such as:

• Raw rubber processing: plasticizing the raw rubber to reduce elasticity and improve plasticity, preparing for subsequent processing steps.
• Rubber compound mixing: mixing the various rubber raw materials, compounding agents, and additives together to obtain the required performance and quality.
• Rubber compound sheeting: pressing the mixed rubber into a specified thickness for subsequent processing or molding.
• Impurity removal: squeezing out impurities from the rubber during the mixing process to improve rubber purity.
• Recycled rubber processing: crushing, mixing, refining, among other procedures for recycled rubber to regain its utilization value.

The rubber mixing mill has several advantages, such as:

• Simple structure: The open mill has a simple structure compared with the other rubber processing equipment, and the manufacturing difficulty is relatively low.
• Easy to operate: The operating method is relatively easy to learn, and with some training, the operator can get started quickly.
• Convenient maintenance: The equipment is relatively easy to disassemble and repair, making maintenance more manageable.
• Strong applicability: The open mill is applied to various rubber materials and is adaptable to the production of rubber products with different formulas and process requirements.
• Easy to observe: The open structure of the machine allows the operator to directly observe the processing process of the rubber between the rollers.

The rubber mixing mill has some disadvantages, including:

• High labor intensity: Workers need to operate the machine manually, which requires a lot of physical energy, especially in the long production process.
• Low safety: Operators are prone to work-related accidents during operation due to the exposure of the rollers.
• Dust pollution: Dust is easily generated during the rubber mixing process, which pollutes the environment and can cause loss of formula materials.
• Unstable quality: The quality of rubber mixing depends to a certain extent on the experience and technical level of the operator.

The technical parameters of the rubber mixing mill include various components such as spec and power. Some of the parameters are:

• Roller diameter: This is an essential parameter that measures the specification of the mixing mill. The larger the roller diameter, the greater the processing capacity and handling volume of the equipment.
• Roller width: It affects the width and output of the rubber compound processed each time.
• Roller speed ratio: The speed ratio of the front and rear rollers has an important influence on the mixing effect and processing efficiency of the rubber compound.
• Roller spacing: The adjustable roller spacing range determines the thickness and hardness range of the processed rubber compound.
• Motor power: This determines the power output of the mixing mill and the rubber compound load that can be handled.