Why can't FE injection molding machine squeeze out the material?

Cause analysis of poor plasticization of injection molding machine 1. Scorching phenomenon (1) reflects that the temperature is too high, or the instrument for controlling the temperature is out of order, which leads to overheating and scorching of plastics. (2) There is smoke from the glue outlet of the nose, with strong pungent smell and crackling sound. (3) Granular scorch appears on the plastic surface. (4) There are continuous air holes at the glue line. 2. Causes of scorching (1) Excessive temperature control leads to scorching of plastics. (2) If the screw is not cleaned after long-term use, the burnt matter will accumulate and be extruded together with the plastic. (3) If the heating time is too long, heating the plastic deposits for a long time will lead to the aging, deterioration and combustion of plastics. (4) The parking time is too long, and there are no cleaning heads and screws, which leads to the decomposition and combustion of plastics. (5) Changing the mold or color for many times leads to decomposition and combustion of plastics. (6) The gland of the head is not tight, and the plastic is aged and decomposed inside. (7) The instrument for controlling the temperature is out of order, resulting in scorching after ultra-high temperature. 3. Method of eliminating scorch (1) Check whether the heating system is normal. (2) Clean the screw or the nose regularly and thoroughly. (3) heating according to the process requirements, heating time should not be too long, if there is a problem with the heating system, please find the relevant personnel to solve it in time. (4) Change the mold or color in time, keep it clean, and prevent noise or glue sticking. (5) After die adjustment, the die sleeve gland should be pressed tightly to prevent glue from entering. (6) found burnt should immediately clean up the nose and screw. Second, the plasticization is poor 1, and the phenomenon of poor plasticization (1) There is toad skin on the surface of the plastic layer. (2) The temperature control is low, the temperature reflected by the instrument pointer is low, and the measured temperature is also low. (3) The plastic surface is black, with tiny cracks or small particles, which has no good plasticizing effect. (4) The plastic is not sewn well and there are obvious marks. 2. Reasons for poor plasticization (1) The temperature control is too low or inappropriate. (2) There are resin particles in the plastic that are difficult to plasticize. (3) Improper operation method, too fast screw and traction speed, and incomplete plasticization of plastic. (4) The plastics are not evenly mixed during granulation or the plastics themselves have quality problems. 3. The method of eliminating poor plasticization (1) controls the temperature according to the process specification. If the temperature is found to be low, the temperature should be raised appropriately. (2) It is necessary to appropriately reduce the speed of the screw and traction to increase the time for heating and plasticizing plastics and improve the plasticizing effect of plastics. (3) Using screw cooling water to enhance the plasticization and compactness of plastics. (4) When selecting the mold, the mold sleeve should be smaller to strengthen the pressure of the glue outlet. Third, bumps 1, the phenomenon of generating bumps (1) The bumps generated during the resin plasticization process have small crystallizing point and small particles on the surface of the plastic layer, which are distributed around the surface of the plastic layer. (2) The pimples caused by scorching have scorched the products on the surface of the plastic layer, especially on the surface of the glue joint. (3) impurity bumps, there are impurities on the plastic surface, and there are impurities in the chip bumps. (4) Plastic bumps caused by poor plasticization. After slicing, it was found that there was cooked glue in the bump. 2. The cause of the pimple (1) Because of the low temperature control, the plastic was extruded from the mold before plasticization. (2) The quality of plastics is poor, and there are resins that are difficult to plasticize, so they are extruded without complete plasticization. (3) Some impurities are added into the hopper during the feeding process, causing impurities to bulge. (4) The temperature control is too high, which leads to scorching and produces scorching bumps. (5) The molded cover is not tightly pressed, and it will age and deteriorate after glue injection, resulting in a pimple. 3, the method of eliminating a knot in one's heart (1) plastic itself caused by a knot in one's heart, should raise the temperature appropriately. (2) When feeding, strictly check whether there are sundries in the plastic. When feeding, don't add other sundries in the hopper. If impurities are found, immediately clean the machine head and drain the glue from the screw. (3) If the temperature is found to be too high, the temperature should be lowered appropriately immediately. If the effect is not good, the head and screw should be cleaned immediately to eliminate the burnt matter. (4) When resin bumps and bumps with poor plasticization appear, the temperature should be increased or the speed of screw and traction should be appropriately reduced. Four, the plastic layer plus or minus out of tolerance 1, out-of-tolerance phenomenon (1) The screw and traction speed are unstable, and the ammeter or voltmeter swings left and right, thus affecting the outer diameter of the cable and producing the deviation of the plastic layer. (2) There are problems with the quality of semi-finished products, such as loose winding of steel belt or plastic belt, uneven phenomenon or defects such as package, edge and pit in plastic layer. (3) The temperature control is too high, which leads to the decrease of extrusion quantity, which makes the outer diameter of the cable suddenly thinner and the plastic layer thinner, forming a negative difference. 2. The reason for the out-of-tolerance (1) is that the wire core or cable core is not round, has a snake shape, and the outer diameter changes too much. (2) Semi-finished products have quality problems, such as: poor joint of steel belt, loose sleeve of steel belt, rolled edge of steel belt, loose sleeve of plastic belt, oversized joint, scattered flowers, etc. (3) During operation, the selection of mold core is too large, resulting in eccentricity of plastic layer during glue injection. (4) During mold adjustment, the mold adjustment screw is not tightened, resulting in the phenomenon of anti-twisting, which makes the plastic layer eccentric. (5) The lead screw or traction speed is unstable, resulting in out-of-tolerance. (6) The feed inlet or filter screen is partially blocked, which reduces the glue output and causes negative difference. 3. Method of eliminating out-of-tolerance (1) Always measure the cable outer diameter and check the thickness of plastic layer. If the outer diameter changes or the plastic layer is uneven, it should be adjusted immediately. (2) The mold should be properly selected. After adjusting the mold, tighten the mold adjusting screw and press the gland. (3) Pay attention to the spiral and traction current and voltmeter. If it is unstable, find an electrician and fitter to repair it in time. (4) Don't add thin strips or other sundries in the hopper. If this situation is found, it should be removed immediately. V. Uneven thickness of cable outer diameter and bamboo-like 1, uneven thickness and bamboo-like phenomenon (1) cable outer diameter is uneven and bamboo-like is unstable due to screws or traction. (2) Due to the sudden instability of traction, the plastic forming the cable is bamboo-shaped. (3) The selection of dies is small, and the outer diameter of semi-finished products changes greatly, resulting in uneven thickness of plastic layer of cables. 2. Uneven thickness and bamboo (1) unwinding or uneven traction speed. (2) The external diameter of semi-finished products changes greatly, and the die selection is inappropriate. (3) The screw speed is unstable, the main motor speed is uneven, and the belt is too loose or slipping. 3. The method of eliminating unevenness and slub shape (1) Always check whether the speed of screw, traction and unwinding is uniform. (2) Mold selection should be appropriate to prevent glue pouring. (3) Always check the operation of machinery and electrical appliances, and find a fitter and electrician to repair the problems immediately. Six, the glue line is not good 1, and the phenomenon of bad glue line (1) is on the outside of the plastic layer surface. Plastics are not well combined, and there will be black spots and cracks in serious cases. (2) The joint of adhesive layer is not plasticized well, and there are bumps and tiny particles. In severe cases, it will be torn by hand. (3) The control temperature is low, especially for the nose. 2. The reason of poor glue joint (1) is low control temperature and poor plasticization. (2) Long-term use of the nose causes serious wear. (3) The temperature control of the nose is out of order, resulting in too low temperature, which leads to poor plastic lamination. 3. Method of eliminating bad glue line (1) Appropriately raise the control temperature, especially the control temperature of the machine head. (2) The exterior of the machine head is insulated with a heat preservation device. (3) Add two layers of filter screen to increase the pressure and improve the plasticization degree of plastic. (4) Properly reduce the speed of screw traction to prolong the plasticizing time of plastic and achieve the purpose of plastic joint. (5) Extend the bearing diameter of the die and improve the extrusion pressure and temperature. Seven. Other defects 1, blowhole, bubble or blowhole (1) Cause (1) Local control temperature is too high. (2) The plastic is wet or has moisture. (3) After parking, the excess gas in the plastic is not eliminated. (4) The natural environment is humid. (2) The exclusion method (1) should be used to control the temperature properly. If the temperature is too high, it should be adjusted immediately to prevent the local temperature from being too high. (2) Strictly check the plastic quality when feeding, especially in rainy season. If the water is found to be wet, stop using it immediately, and then clean the wet material. (3) A preheating device is added at the feeding place to drive away the moisture and moisture in the plastic. (4) Frequently sampling to check whether there are pores, pores and bubbles in the plastic layer. 2. Broken wire or glue (1) leads to (1) water or oil in the conductive wire core. (2) The wire core is too heavy to contact with the mold core locally, which leads to temperature drop, plastic local cooling, and broken wire or glue due to plastic stretching. (3) The quality of semi-finished products is poor, such as loose steel belts and plastic belts, and the joints are not firm or too large. (2) The die selection of exclusion method (1) should be larger, especially the die with sheath should be enlarged by 6 to 8 mm ... (2) The length and thickness of the die core nozzle should be appropriately reduced. (3) Reduce the speed of screw and traction. (4) Appropriately increase the control temperature of the nose. 3. The reason of the pit and eye (1) (1) tightly pressed conductive wire core is not tightly twisted and there is a gap. (2) There is water, oil and dirt in the wire core. (3) The semi-finished product has defects, such as stranded wire expenditure, falling off, cross bending, overlapping of steel belt and plastic belt, loose sleeve, too large joint, etc. (4) Low temperature control. (2) The compaction of stranded conductors by exclusion method (1) shall comply with the process regulations. (2) The semi-finished products do not meet the quality requirements, and should be treated before production. (3) Remove dirt and preheat cable core or wire core. 4. Plastic wrapping, edges and corners, ears, wrinkles and bulges (1) Cause (1) Quality problems caused by plastic wrapping and ladle edge. (2) The mold selection is too large, which is caused by vacuum pumping. (3) Plastic pouring occurs after the mold core is damaged. (4) The wire core is too heavy, and the plastic layer is not well cooled. (2) Check the quality of semi-finished products by exclusion method (1), and the unqualified products will not be produced. (2) Check the mold before assembly, and deal with the problems before use. (3) Mold matching should be appropriate. Properly reduce the traction speed to completely cool the plastic layer. 5. Traces on the plastic surface (i) cause the surface of (1) die sleeve bearing diameter to be unsmooth or notched. (2) When the temperature is controlled too high, the barium stearate in the plastic itself decomposes and accumulates at the mouth of the die sleeve, causing traces. (2) Exclusion method (1) When selecting the die, check whether the bearing diameter surface of the die sleeve is smooth, and deal with any defects. (2) Reduce the temperature in the heating area of the handpiece appropriately, and take out barium stearate immediately after it is produced.