PU nylon coated gloves in the raw rubber preparation process which

PU nylon coated gloves in the raw rubber preparation process which? The mill is mainly used for the plasticizing, kneading, hot refining, tabletting and forging of rubber. It can also be used for the crushing, refining and refining of recycled rubber. In addition, it is also widely used in plastic processing and paint pigments industrial production.

    Grinding machine according to the fingers of the rubber processing technology used to classify, mainly plastic (} Kun) refinery (raw plastic Lian Lian, compound kneading), hot melt machine (rubber preheating), tablet machine (To remove the impurities in the raw rubber, waste glue or tape), refining machine (remove the hardened material in the recycled rubber), recycled rubber kneading machine (broken rubber, (Natural rubber smokers and crepe production), the experimental use of rubber mixing machine (a small amount of rubber compound (broken rubber) experiment).

    The mill is classified according to its structure and transmission form. There are three kinds of standard type, integral type and double motor drive type.

    The mill specifications are shown in front of the roll diameter and are preceded by a Chinese phonetic symbol to indicate the model and purpose of the machine. Such as XK a 400, X said rubber, K table does not open the mixer, 400 said roller part of the working diameter of 400ram, such as X (S) K a 400, said the plastic class, this mill for rubber and plastic Be applicable. For some specialized use of the mixing machine, sometimes also code behind a symbol, such as XKP table does not break the plastic machine, XKA said hot melt machine.

    There are many types of lapping machines, but the basic structure is much the same. It is mainly composed of roller, roller bearing, frame and beam, frame, distance and safety device, thermostat, lubrication device, transmission, emergency brake device and brake.

    Commonly used closed mixing machine (I ~ 2T referred to as the mixer) with rotor-tangent and rotor-type two. The main difference between the mixer of the tangential rotor and the mixer of the meshing rotor is the rotor. The tangential rotor has an oval cross section and two edges and four ribs. The two rotors have a speed difference (speed ratio), and the ribs are not engaged with each other. The meshing rotor has a circular cross-section, and the rotational speeds of the two rotors are the same and the ribs are engaged with each other.

    According to the mixer rotor speed can be divided into different: slow mixer (rotor speed below 20r / rain), medium speed mixer (rotor speed at 30r / min or so) and fast mixer (rotor speed at 40r · / Min above).

    According to the mixer rotor section shape is different, can be divided into oval rotor mixer, cylindrical rotor mixer, three prism rotor mixer three.

    Press the mixer speed is variable single speed mixer, two-speed mixer (the rotor has two speeds); four-speed; variable speed mixer and so on.

    The specifications of the mixer are generally expressed in terms of the total volume of the mixing chamber and the speed of the long rotor (active rotor). At the same time in front of the total capacity of the symbol, to indicate what kind of machine. Such as XM a 80 × 40 type, where X said rubber, M said the mixer, 8

Indicating that the total capacity of the mixing chamber is 80L and 40 indicates that the long rotor speed is 40r / min. Another example is the XM a 270/20 × 40 type, which means that the total mixing capacity of 270L, two-speed (20r / min, 40r / min) rubber class mixer. If the symbol preceded by X (S) M, S represents the plastic class, it shows that the mixer is suitable for both rubber and plastic.

The mixer is usually composed of the mixing section rotor part, feeding and pressing device part, discharge device part, transmission part, heating and cooling and air pressure, hydraulic, electronic control system and other components.

    (1) Finger sets of baking adhesive is mostly large pieces (such as natural rubber rubber bag quality is generally 50 ~ 100kg), at room temperature, high viscosity, especially in the winter, raw rubber often hardened or crystalline, Difficult to cut and further processing. Therefore, before the plastic to baking, heating softening rubber or to lift the crystal, making it easy to process. Baking equipment can be divided into drying room, oven, infrared, high frequency current. Oven for large-scale production; oven for small-scale production and research departments and laboratory tests; infrared and high frequency current is suitable for advanced industrial production. The temperature of the baking, the time to be appropriate, natural rubber baking temperature of 50 ~ 60 ~ C, baking time in spring, summer and autumn are generally 24 ~ 48h, winter is generally 36 ~ 72h; finger sets of neoprene The temperature of the rubber is 50 ~ 60 ~ C, the time is 150 ~ 180min, or the baking temperature is 24 ~ 40 ~ C, the time is 4 ~ 6h; the baking temperature should not be too high, otherwise it will cause the rubber aging and affect the physical Mechanical behavior.

    (2) cut rubber natural rubber cut plastic block is generally lO ~ 20kg, chloroprene rubber generally each piece does not exceed 10kg, other synthetic rubber generally lO ~ 15kg each. The plastic block is best triangular diamond, so that when the smooth break into the roll gap. Cut the general use of single-blade hydraulic vertical cutting machine and multi-knife horizontal cutting machine two. The former is suitable for small and medium-sized industrial production and synthetic rubber cutting use, which applies to large-scale industrial production.

     (3) broken rubber natural rubber and neoprene rubber and other rubber cutting block, in the plastic before the need to use broken plastic machine to break the plastic to improve the efficiency of plastic processing. Other synthetic rubber cut plastic block, generally without breaking the plastic and direct plastic refining (or mixing). In addition the use of large-capacity mixer t Kun Lian also do not need to break the glue. Breaking roller spacing is generally 2 ~ 3mm, roll temperature control at 45 ℃ below.

     ① open mill plastic grinding mill is the earliest use of a plastic molding method. The two rollers of the mill are rotated relative to each other at different rotational speeds. The rubber is carried by the roller under the action of the friction force. Under the action of the shearing force of the roller, the rubber molecular chain is stretched and broken. The plasticity of the rubber is increased. The plasticizing method of the mill is high, the production efficiency is low, the operating condition is poor, but the plasticity of the plastic compound is uniform, the thermoplasticity is small, the adaptability is wide, the flexibility is flexible and the investment is small. Therefore, apply to more changes in plastic species, less consumption of plastic occasions.

    Kaichang plastic molding usually have thin-plastic, package roll plastic and add chemical plasticizer and other methods. Thin plastic method is the raw rubber in the roll from 0.5 ~ lmm through the roll gap, no roll, thin on the disk, repeat the thin pass to the required number or time until the required plasticity so far. Package roll plastic method is the raw rubber in the larger roll distance (5 ~ 10mm) F package roll after continuous roller mastication, until the specified time so far, divided into a plastic and sub-plastic. A piece of plastic, plastic for a long time, low efficiency, does not apply to the plasticity of the higher requirements of plastic rubber; sub-plastic refining, package roll plastic 10 ~ 15min, under the film, cooling, parking 4 ~ 8h, And then the next plastic refining, until the required plasticity so far. Chemical plasticizer The method of plasticizing is based on the above-mentioned thin-pass plasticizing method and primary plasticizing method. It can increase the plasticizing efficiency, shorten the time of plasticizing and reduce the time Plastic rubber elastic recovery and shrinkage.

    ② Mixer Mixing material from the hopper to join the mixing room, the feeding door closed, pressing the device on the top bolt landing, the material pressure. Material in the top bolt pressure and friction under the effect of being brought into two with a spiral edge, speed ratio, the relative rotation of the two rotor gap, so that the material in the rotor and rotor, rotor and mixing chamber Wall, the top of the bolt, the next bolt composed of the pinch refining system, by the ever-changing and repeated shear, tear, stirring and friction of the strong pinching effect, so as to achieve the purpose of plastic refining. Mixer mill not only the production capacity, plastic processing efficiency, and a high degree of automation, power consumption, labor intensity and health conditions can be improved. However, due to the high temperature and oxidative cracking of the rubber compound, the physical and mechanical properties of the vulcanizate are reduced, and the equipment cost is high, the area is large, the cleaning and repair is more difficult and the adaptation surface is narrower , It is generally applicable to less changes in plastic species, consumption of large quantities of industrial production.

    Mixing machine The method of plasticizing usually has a plasticizing, sub-plasticizing and adding chemical plasticizer. A section of plastic is a raw rubber into the mixing room, in a certain temperature and pressure conditions under the continuous plastic to the required plasticity requirements. Segmented mastication is usually carried out in two steps, the first raw rubber placed in the mixer in a certain period of time (20r / min mixer mixing time of 10 ~ 15min), and then row of plastic, pound, Under the film, cooling, parking 4 ~ 8h, and then the second paragraph of plastic (time 10 ~ 15min) to meet the plastic requirements, two plastic plastic plastic up to 0.35 ~ O. 50 (wicker). Add chemical plasticizer with a plastic molding the same plastic chemical agent to add the amount of raw rubber is generally 0.3% to 0.5%, and the form of gum to join to improve the dispersion effect. The use of chemical plasticizer, the plasticizing temperature can be reduced.

    ③ screw plastic molding machine plastic grinding machine is the use of screw and screw thread with a serrated thread between the mechanical role, so that raw rubber by crushing, friction, stirring, and at high temperatures to obtain a plastic effect of a continuous plastic Refining method. The use of equipment is mainly a single screw a plastic mill and twin screw two plastic molding machine. The plastic mill has the advantages of continuous, high degree of automation, large production capacity, less power consumption, less land area and low labor intensity. It is most suitable for large-scale industrial production with low raw rubber and small consumption.