Plastic pelletizing machine failure reason and treatment method

1. The screw runs normally but does not discharge

Reason: The feed of the hopper is not continuous; the foreign matter in the feed port is blocked or “bridging”; the hard metal inside the screw groove blocks the screw groove and cannot be fed normally;

Treatment method: increase the feeding amount to make the screw feeding continuous and stable; stop the foreign matter in the material port to eliminate the phenomenon of “bridge”; if it is confirmed that metal foreign matter falls into the screw groove, immediately stop the disassembly screw to remove metal foreign matter.


2. The plastic pelletizing machine main unit does not rotate or stop instantaneously

Cause: The power of the main motor is not turned on; the heating and heating time is insufficient, or one of the heaters does not work, causing the torque to be too large to overload the motor.

Treatment method: Check whether the host circuit is connected, turn on the power; check the temperature display of each segment, confirm the warm-up temperature rise time, check whether the heaters are damaged or have poor contact, and eliminate them.

3. Vent hole

Reason: The raw materials are not clean enough with impurities; the feed rate is too fast to make the screw extrusion unstable; the plasticizing temperature is not enough for screw extrusion.

Treatment method: clean the raw materials and then feed or replace the filter; reduce the feed amount to make the plasticized stable screw smoothly squeeze; increase the plasticizing temperature (the temperature should not be too high to prevent burn plastic and affect the production quality).

4. The main motor rotates, but the screw does not turn.

Cause: The transmission V has a loose bandwidth and wear and slip; the safety button is loose or disconnected.

Treatment: Adjust the V-belt center distance, tighten the belt, or replace the new V-belt; check the safety key, analyze the cause of the break, and replace the safety key.

Brief introduction of plastic granulator equipment and screw characteristics

Brief introduction of plastic machinery single screw, the ratio of effective working length to the diameter of the single screw of plastic pellet machine is called aspect ratio. Under the condition that the single screw speed is constant, the aspect ratio increases, which means that the movement time of the material in the single screw of the plastic pellet machine increases, which is beneficial to the plasticization and mixing of the plastic, and can be the relaxation of the heating process; When the diameter ratio is increased, the red equalization length is increased correspondingly, and the plastic granulator can reduce the countercurrent flow rate and the leakage flow rate, which is equivalent to increasing the production capacity.

Ordinary extruder single screw can be divided into three sections of different structure, which are heating section, compression section, and metering section. Their main functions are as follows: feeding section - solid conveying of polymer materials. Compressed section—Compresses the material and melts the material. Metering section—mixing and mixing the molten material (and thus the homogenization section) and delivering the melt to the die at a constant pressure.

       The noise generated by the single screw of the plastic granulator in rotating the extruded material, the plastic granule machine is mainly the sound generated when the single screw rotates and rubs against the inner wall of the barrel. There are several reasons for the phenomenon of friction between the barrel and the single screw. The single screw is assembled in the barrel, and the concentric error of the two parts is large. The perpendicularity of the end face of the barrel and the end face of the machine and the center line of the machine can be guaranteed with a large error. Single screw bending deformation, the straightness error of the shaft centerline is too large. The assembly clearance between the single screw and its supporting drive shaft is too large. When the rotary operation is performed, the two axes are not concentric, and the error is too large.

How to specifically clean the plastic pelletizing machine method

Plastic pelletizing machines are widely used in the processing of various raw materials. Another insulating plastic pellet machine capable of handling many types of intensively mixed thermoplastic materials, accepting larger impurities 30% to 40%, plastic trash cans not softening or melting polymer materials, it can contain other non-polymerization Things such as paper, glass, metal, dirt, and more.


    Plastic pelletizing machines are made up of more than 60% of the material consisting of polyolefins, which are involved in contaminants (impurities) during softening or melting treatment. The material currently uses various types of waste plastics. The extruder of plastic particles can produce a cross-section of a variable cross-section with a constant cross-section and the size is 15.2cmX15.2cm.

    The mixed mold is molded in plastic and the plastic pellets can be treated with a mixture of 50% to 70% thermoplastic. The plastic pelletizing machine mixes the friction (low melting point) partially melted and automatically adjusts the scraper to remove the molten material from the plastic machine. The pellet extruder dies into a predetermined amount, a roll-shaped container, and then sends a news device, optionally having a series of compression dies.

    Before use, it is possible to pulverize the waste during the molding of the plastic ball. Plastic pelletizing machines are machines that process plastics. Heat treatment is generally required, which causes the machine to be prone to congestion. At this time we need to clean the plastic pelletizing machine. The following is a detailed explanation of the specific cleaning methods for plastic pelletizing machines.

    The plastic pelletizing machine is vacuumed. Repeat several times. Until the cavity contains vinyl chloride; the air duct of the blower is placed in the cavity for ventilation. Close the relevant valves on the plastic pelletizing machine (monomer feed valve, nitrogen valve, single gas recovery valve, non-ion water feed valve, disconnect the air supply of the automatic opening and closing valve of the feed port. Cut off the power of the plastic pelletizing machine. In the whole process of cleaning operations, we should carefully monitor and timely transfer of the tools and ensure the safety of the personnel in the kettle. If abnormal conditions are found, we should promptly assist in handling or contacting.

Purchase plastic granulator use

    Clearly purchase the purpose and purpose of the plastic granulator

    There are three types of customers who buy plastic granulators. One is to prepare for investment and entrepreneurship, and it is individual or private. The other is that it is a company itself. It needs to buy plastic pellet machine to solve the problem of scrap produced in its own factory. The other category is Distribution, trade business, today we talk about the problems that customers who are ready to buy machines for investment and entrepreneurship should pay attention to before choosing plastic pellet machine.

    For example, such purchase customers must first make a mapping of their local raw material purchase market. Due to the variety of plastics, we usually use general-purpose plastic processing, unless we have a clear sales channel for specialty plastics.

   General-purpose plastics are mainly made of PP and PE. The raw materials of these two types of raw materials can be seen everywhere, such as pots, barrels, agricultural film, plastic film, woven bags and so on. PS foam material is relatively small, but if the local material is more, it is also a good choice. In short, before starting a business, a clearer determination should be made on the raw materials to be processed.

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