The main reasons and solutions for the uneven color of injection molded products are as follows: (1) The colorant is poorly diffused, and this often causes a pattern to appear near the gate. (2) The plastic or colorant has poor thermal stability. To stabilize the color tone of the part, it is necessary to strictly fix the production conditions, especially the material temperature, the amount of material and the production cycle. (3) For crystalline plastics, try to make the cooling speed of each part of the parts consistent. For parts with large difference in wall thickness, coloring agent can be used to mask the chromatic aberration. For the parts with uniform wall thickness, the temperature and mold temperature should be fixed. . (4) The shape and gate form of the part, the position has an influence on the filling condition of the plastic, so that some parts of the part have chromatic aberration and should be modified if necessary. The reasons and solutions for the color and gloss defects of injection molded products are as follows: Under normal circumstances, the gloss of the surface of the injection molded part is mainly determined by the type of plastic, the colorant and the finish of the mold surface, but often the surface color and gloss defects, surface darkness and other defects of the product are caused by some other reasons: (1) The mold has poor finish, the surface of the cavity has rust, etc., and the mold is poorly exhausted. (2) The casting system of the mold is defective. The cold material well should be enlarged, the flow channel should be enlarged, the main flow channel should be polished, the runner and the gate should be polished. (3) The material temperature and the mold temperature are low, and the local heating method of the gate can be used if necessary. (4) The processing pressure is too low, the speed is too slow, the injection time is insufficient, and the back pressure is insufficient, resulting in poor compactness and darkening of the surface. (5) The plastic should be fully plasticized, but the degradation of the material should be prevented, the heat should be stable, and the cooling should be sufficient, especially thick-walled. (6) Prevent cold material from entering the part, and if necessary, use a self-locking spring or lower the nozzle temperature. (7) Excessive recycled materials are used, plastic or colorant is of poor quality, mixed with water vapor or other impurities, and the quality of the lubricant used is poor. Causes and solutions for wave flow marks: (1) Poor flow of the melt causes the surface of the plastic part to generate annual ring-shaped wave flow marks centered on the gate. When the low-temperature and high-viscosity melt with poor flowability is injected into the cavity in the injection port and the flow path in a semi-curing wave state, the melt flows along the surface of the cavity and is squeezed by the continuously injected subsequent melt to form a reflux and a stagnant flow. Thus, an annual ring-shaped wave flow mark centered on the gate is generated on the surface of the plastic part. For the cause of this failure, the mold and nozzle temperatures can be increased to increase the injection rate and filling speed. Increase injection pressure and hold pressure and increase time. It is also possible to provide a heater at the gate to increase the local temperature of the gate portion. It is also possible to appropriately enlarge the gate and runner cross-sectional area. The cross section of the gate and the runner is preferably round, and this section can achieve the best filling. However, if a gate is placed in a weak area of ​​the plastic part, a square cross section should be used. In addition, the bottom of the injection port and the end of the runner should be provided with a large cold hole. The material temperature has a great influence on the flow performance of the melt. The more attention should be paid to the size of the cold hole, the position of the cold hole must be set in the melting. The end of the material along the flow direction of the injection port. If the main cause of the annual ring-shaped flow marks is poor resin performance, a low-viscosity resin may be used under conditions of sufficient conditions. (2) The flow of the melt in the flow channel is not smooth, resulting in spiral wave flow marks on the surface of the plastic part. When the melt flows from a narrow cross section of the flow passage into a cavity of a larger cross section or the flow path of the mold is narrow, and the finish is poor, the flow material is likely to form a turbulent flow, which causes a spiral wave flow mark to be formed on the surface of the plastic part. In this regard, the injection speed can be appropriately reduced or the slow, slow, and slow classification control can be applied to the injection speed. The gate of the mold should be placed in a thick wall or directly on the wall side. The gate form is preferably shank, fan or diaphragm. It is also possible to appropriately enlarge the flow passage and the gate cross section to reduce the flow resistance of the flow material. In addition, the flow rate of cooling water in the mold should be controlled to maintain the mold at a relatively high temperature. If the barrel and nozzle temperatures are properly increased within the process operating temperature range, it is beneficial to improve the flow properties of the melt. (3) Volatile gases cause cloud-like wave flow marks on the surface of the plastic part. When using aBS or other copolymer resin raw materials, if the processing temperature is high, the volatile gas generated by the resin and the lubricant will cause cloud-like wave flow marks on the surface of the plastic part. In this regard, the mold and barrel temperature should be appropriately reduced, the exhaust condition of the mold should be improved, the material temperature and filling rate should be lowered, and the gate cross section should be appropriately enlarged. It should also be considered to replace the lubricant type or reduce the quantity.
Gabion
boxes are made of Galvanized Wire / ZnAl (Golfan) coated wire / PVC
coated wires, the mesh shape is hexagonal style. The gabion boxes are
used widely in slope protection, foundation pit suporting, mountain rock
holding, river and dams scour protection.
Gabion
boxes can be supplied in various lengths, widths and heights. In order
to strengthen the boxes,all the edges of the structure shall be
selvedged with wire of bigger diameter.
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