(1) the shape of the product structure is not complete
¢Ù melt plastic temperature is low, should improve the barrel temperature.
¢Ú insufficient pressure or packing pressure is relatively small, should be appropriate to increase the observation effect.
¢Û injection volume is insufficient, it may be a serious wear or tear of the screw or the role of check valve failure.
¢Ü nozzle and mold bushing mouth contact bad, resulting in more than when the injection.
¢Ý nozzle temperature is low.
¢Þ injection speed is low, should be appropriate to increase the injection speed.
¢ß screw back pressure is low, the quality of raw materials, plastic uneven.
¢à mold heating temperature is low or uneven temperature of the various parts, the temperature difference, should check the heater is damaged or appropriate temperature control.
¢á melt flow problem. Such as low flow channel temperature, small cross-sectional size or surface roughness.
¢â the size of the structure of the product is unreasonable, and some parts of the wall thickness is too small.
(2) the appearance of the product instability of the phenomenon of contraction
¢Ù injection melt pressure is small, should be appropriate to improve.
¢Ú low pressure or holding pressure is insufficient.
¢Û high barrel temperature, melt plasticization temperature is high, should be appropriate to reduce the barrel temperature.
¢Ü screw back pressure is low, resulting in melt plasticized uneven, to improve the screw back pressure.
¢Ý mold temperature. Should be appropriate to adjust and observe the effect, mainly the mold temperature is high, increase the cooling time curing.
¢Þ nozzle aperture is small, should be appropriate to increase.
¢ß injection of melt speed is slow, to adjust and improve the appropriate.
¢à injection volume is insufficient.
¢á mold gate position layout is unreasonable.
¢â product structure shape design is unreasonable, resulting in local stress imbalance.
(3) product stripping difficult
¢Ù melt injection pressure is high, should reduce the injection pressure.
¢Ú melt temperature is high, should reduce the barrel temperature or reduce the screw speed.
¢Û raw materials containing high water, should be dried.
¢Ü mold temperature is low or the temperature difference between the various parts.
¢Ý mold forming products surface rough, stripping slope is not enough, should be grinding transformation.
¢Þ pressure cooling curing time is short, should be appropriate to extend the cooling time.
¢ß release agent coating less than the amount or coating is not uniform.
(4) products have flash
¢Ù two mold face mold is not tight or rough surface, should be improved maintenance.
¢Ú melt injection pressure is high, should be appropriate to reduce the injection pressure.
¢Û clamping force is insufficient, should increase the clamping force.
¢Ü high melting temperature, should reduce the temperature.
¢Ý too much injection of the amount of melt should be adjusted to reduce the injection time, the amount of material or injection speed.
¢Þ molding mold temperature is high, should reduce the mold temperature.
(5) easy to break when the product stripping
¢Ù raw materials, plasticized uneven, should be appropriate to improve the screw back pressure.
¢Ú molding mold temperature is low, should increase the mold temperature.
¢Û the working position of the ejector rod is not appropriate or the erection is uneven, and the rupture site should be found, and the working position of the ejector rod should be adjusted appropriately.
¢Ü mold mold release angle is not enough, should improve the mold, increase the stripping angle.
¢Ý product stripping some parts of the vacuum phenomenon or mold structure is unreasonable, there is local stress concentration products, need to re-design transformation mold.
¢Þ side slider and open mode action or top action is not coordinated, should modify the mold.
¢ß forming mold surface rough, should be re-grinding to reduce the molding surface roughness.
¢à release agent coating uneven or the amount is not enough.
(6) the surface of the product has welding marks
¢Ù raw materials, plastic uneven, should improve the screw back pressure.
¢Ú molding mold temperature is low, should be appropriate to improve the mold temperature.
¢Û injection pressure and speed is low, should be appropriate to improve.
¢Ü nozzle aperture is small, should expand some of the diameter to increase the amount of time per unit of injection.
¢Ý melt flow section is small, affecting the flow, should increase the melt flow path aperture.
¢Þ raw materials in the water content is too high, the raw materials should be dry, so that the water content is less than the allowable water content of raw materials.
(7) The surface of the product is rippled
¢Ù raw materials, plastic melting uneven, should be appropriate to improve the barrel temperature or improve the screw back pressure.
¢Ú mold temperature is low, should increase the mold temperature or balance the temperature of various parts.
¢Û adjust the melt injection pressure, injection pressure is insufficient or high will affect the apparent quality of the product.
¢Ü curing pressure curing time is short, should be extended.
¢Ý raw materials containing water is too high, should be dry raw materials.
¢Þ melt injection speed is unreasonable, pay attention to the injection speed too fast or too slow on the apparent quality of the products have an impact.
¢ß mold forming surface rough, should be grinding to reduce its roughness.
(8) products have bubbles or crayons
¢Ù raw materials containing high water content, the raw materials should be dry, so that the water content of raw materials is less than the allowable water content requirements.
¢Ú raw materials are not high temperature additives, should be replaced.
¢Û high temperature barrel or raw material in the barrel stay too long, should reduce the front of the barrel temperature or switch to smaller specifications of the injection molding machine.
¢Ü screw back pressure is small, should be appropriate to improve the screw back pressure.
¢Ý low pressure or holding pressure to keep the pressure is short. Should increase the pressure to maintain pressure to extend the pressure cooling time.
¢Þ molding mold temperature is low, should be appropriate to improve the mold temperature.
¢ß injection pressure is too high, should reduce the injection pressure.
¢à injection speed is too fast, should reduce the injection rate.
(9) product surface gloss is not good
¢Ù raw materials, plastic melting quality is uneven, should be appropriate to improve the barrel temperature or screw back pressure.
¢Ú raw materials in the water content is high, should deal with raw materials drying, so that the water content of raw materials does not exceed the raw material to allow water content requirements.
¢Û molding mold cavity surface rough or water droplets, should be polished to improve the cavity surface brightness.
¢Ü added raw materials added improper, should be adjusted to replace.
¢Ý raw materials are not clean, there are impurities.
¢Þ molding mold temperature is low, should be appropriate to improve the mold temperature.
¢ß forming mold melt flow channel, gate diameter is small, melt flow resistance, mold exhaust bad, should be modified mold.
(10) deformation of injection molded products
¢Ù product structure design is irrational, shape and thickness arrangement asymmetry, should improve the design.
¢Ú holding pressure cooling curing time is short, should extend the cooling time.
¢Û forming mold between the various parts of the temperature is uneven, the temperature difference is too large, should improve the temperature control balance, so that all parts of the temperature uniform.
¢Ü ejection force is not uniform, should adjust the working position of the ejector rod.
¢Ý gate position arrangement is unreasonable, should be appropriate to change the gate position.
¢Þ injection of melt pressure, high speed, should be appropriate to reduce.
(11) The product has black or black stripes
¢Ù barrel cleaning is not clean, there are decomposition of the residue, should remove the barrel, thoroughly clean the barrel and screw on the residue.
¢Ú impurities in raw materials, should be checked to replace the raw materials.
¢Û nozzle diameter is small, the gate aperture is small, the melt temperature is high, the injection pressure is high, fast and other factors are likely to cause the melt due to high temperature and yellow or decomposition, should be itemized to observe the melt quality, cause of issue.
¢Ü barrel or nozzle parts of the material area, resulting in melt decomposition, black spots or stripes, should remove the barrel, nozzle, find out the material area, and grinding. |
