Broken strip 1. The raw materials are miscellaneous materials, and check whether the materials in the lower feeding port contain miscellaneous materials. 2, poor plasticization, need to increase the processing temperature. (For glass fiber reinforced composites, it is often caused by excessive temperature.) 3, the vacuum is not enough, check whether the vacuum operation is good, whether the seal meets the requirements; whether the seal meets the requirements 4. The filter is clogged and the filter is changed. 5, the number of holes in the die is wrong, the material loss balance. 6, no porous plate (except glass fiber products), melt disturbance caused by broken strips, broken bars are mainly concentrated on the left side. 7. The extrusion pressure is too low, the material in the screw is not full, and it is necessary to increase the feeding frequency and increase the number of filter meshes. Firing material: divided into non-plasticized materials, plasticized materials Material without plasticization 1. Appropriately reduce the feed amount or reduce the screw speed. 2. Raise the temperature of the front section to speed up the plasticization of the material in the barrel; for example, the conventional adjustment of the glass fiber port before and after the reinforcement: the temperature of the conveying and melting zone is appropriately increased by 5-10 °C, and the heating zone of the 玱 å£ å£The temperature is appropriately lowered by 10-20 °C. 3. Adjust the front screw combination so that the front and rear transport balances accelerate the plasticization of the material in the barrel. Plasticized material 1. Feeding is too large; reduce feed frequency. 2. The vacuum cover is open. 3. The stencil of the machine head is clogged with carbonization and filling; the head is cleaned. 4. The screw arrangement is wrong (for example, the position of the reverse thread block is not too close to the position of the exhaust port, and generally requires a distance of one thread). Exterior 1. There are holes at both ends of the particle. There are holes at both ends: it indicates that the low-molecular substances contained in the material have more water, and the vacuum exhaust is not cleaned or the raw materials contain more low-molecular water-repellent components. Only one end has a hole: the low molecular weight contained in the material is less water, and it is acceptable if it is not strictly required. Solution: pre-treatment (drying, sealing, etc.); enhanced vacuum exhaust (while taking into account the screw design); increase the temperature of the sink. 2, particle foaming Excessively high, decomposition of raw material components, etc. The moisture content of the raw materials is too high; the raw materials (poor sub-brand materials) are not resistant to temperature or the components are used improperly and chemically reacted with each other; Now a number of holes, or surface roughness is not enough vacuum; temperature. 3. The surface of the particle is smooth and flat. The surface of the particles is smooth and flat, depending on the ingredients of the raw materials used - glass fibers, inorganic minerals, and coarser flame retardants. However, compared to the next, the same batch of materials has differences, the reasons are: 1) Uneven - a large number? Short time? Machine? Processing temperature is not enough, plasticization is not good; The screw combination is unreasonable or the rotation speed is low, the shear is not enough, and the material is not well melted; Excessive lubricant or special processing characteristics (such as slip, low melting point), the material surface slip shear is invalid; 2) Machine problems, such as uneven hole, not smooth enough; 3) The compatibility between the raw material components is not good (including the color pink mother), and delamination and precipitation occur. 4, particle size The length is basically the same (long grain, short grain) The strips are crossed into the granulator; the strips are crossed into the granulator; the rolls are too loose (pelletizer pressure); The sharpness of the cutter is adjusted to adjust the cutter pitch, the gap between the scraper and the spline shaft. 5, long strip The length is more than 2 times the standard particle size, the water is adjusted (especially the 5000 system, the excess moisture has a slippery feel), the pressure roller is too loose (grain machine pressure); the cutter sharpness, the cutter distance, the blade and the flower are adjusted. Key shaft clearance. The moving knife or rubber roller has been severely worn and needs to be replaced. 6, powder Use a clean hand to grab a piece of material and let go of the powder on the palm of your hand. Appropriately reduce the amount of water on the palm. Adjust the cutting temperature of the cutting bar, the clearance between the fixed knife and the hob (between 0.07-0.15MM), and enhance the product. Poor vacuum or vacuum. 7, bonding, scorching too little water, the pelletizer is too fast No hair dryer, or the wind of the hair dryer is too weak. 8, the temperature of the granules and cosmids are too high Adjust the length of the water, or adjust the speed of the pelletizer to cross-stick when it passes the water, or the strip crosses into the pellet. 9, the tail cutter is not sharp Crack in the particle itself 10, rust There are reddish-brown materials on the surface of the particles, mainly due to excessive moisture in the strips, which is caused by rusting of the cutters in the pelletizer. Reduce the amount of water, increase the number of air knives (or increase the strength of the hair dryer). Black spot 1, the surface of the particle has black spots that cannot be erased The cleaning machine is not clean; the vacuum port, the glass fiber port, the die, the residue on the filter plate, the retained, and the high temperature carbonized material are brought in; the temperature is too high, causing the material in the screw and the screw barrel to be carbonized; the flame retardant is pyrolyzed and carbonized; Poor dispersion of toner The raw material grade is not enough, and there are many black spots; 2, color change / black, yellow line / oil particles: The steam in the vacuum port falls into; the retained material in the die, the head and the filter plate is carbonized; the flame retardant is decomposed and charred; the material is decomposed after the downtime is too long; the oil stain adheres to the area of ​​the strip; 3. The surface of the particle has a black point that can be erased. Whether the sink is cleaned, the hopper, the vibrating screen, etc. The black spot is introduced in the uncleaned environment. The material is charred in the barrel. The barrel is in the port and the vacuum port. There are charred materials, need to clean the glass fiber port and vacuum port, as well as carbonized materials in the mold and stencil, you need to remove the die to clean. 3. Black spots caused by unstable pressure A. When there are several MI different materials in the formula, the screw design should be based on the lowest viscosity material and the relatively strongest shear. B. Regularly clean the screen, exhaust port, vacuum port, and pull the screw C. Select the screw with low friction coefficient coating D, introduction of the melt pump Window Screen Mesh is a versatile and practical solution designed to enhance the functionality and comfort of windows. This innovative technology consists of a fine mesh material that is installed over windows to provide a range of benefits. The primary purpose of Window Screen Mesh is to keep insects, bugs, and debris out while allowing fresh air to circulate freely. Additionally, it acts as a barrier against harmful UV rays, reduces glare, and provides privacy without compromising visibility. With its easy installation and low maintenance requirements, Window Screen Mesh is an essential addition to any residential or commercial space, ensuring a comfortable and enjoyable environment. Window screen,Mesh screen,Window mesh Jinwu Glass Fiber Co., Ltd , https://www.jwglassfiber.com
Common problems in 4 extrusion granulation and solutions
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