This article tells you about whether PC materials are difficult to adjust. BAY888.com The world's leading slot game platform, providing exciting gaming experience and generic rewards. Join now and start your journey to victory!
List of contents for this article:
- 1、There are bubbles in the PC material product during plastic injection molding. In addition to debugging and maintaining pressure and temperature, what other methods can solve it?
- 2、How to solve bubbles in PC transparent products
- 3、Solution to bubbles in pc material injection molding
- 4、Common silver bubbles and vacuum bubbles in pc materials and solutions
- 5、Bubbles appear in PC material of injection molding machine
- 6、The product produced by Wanhua pc-ol1107 is foggy. What should I do?
There are bubbles in the PC material product during plastic injection molding. In addition to debugging and maintaining pressure and temperature, what other methods can solve it?
1. Reduce the material temperature (reduce the generation of smoke). Second, slow down the injection speed (to help exhaust gas). 3. Increase the mold temperature (improve the impact of reducing the material temperature and speed on material flow). Fourth, fully ensure the drying of the material (the moisture content of PC material and PA66 must be less than 0.03%). 5. Enlarge the glue inlet point of the mold (conducive to the actual pressure retaining effect). Sixth, the back pressure increases (effectively increases the density of the material). Seventh, mold exhaust must be guaranteed.
2) Problems with injection molding process parameters The injection speed is too fast: the melt quickly fills the cavity, compresses the air in a dead corner and cannot be discharged in time. Injection/holding pressure is too high: compressed air cannot escape under high pressure and is solidified inside the product to form air lines. The back pressure setting is unreasonable: when the back pressure is too low, the air entrained in the raw material is not discharged in the barrel and enters the cavity to increase the trapped air; too high back pressure will cause the raw material to degrade and generate extra gas.
In addition to paying attention to the injection molding process and molds, it is best to anneal the product. For example, PC material can be heated to above 160 ° C for 3 to 5 minutes, and then cooled naturally. Poor surface gloss Due to the large roughness of the mold surface or premature condensation, the resin cannot copy the state of the mold surface. All of this causes slight irregularities on the surface of the product, which loses luster.
The treatment of groove air traces in plastic products requires comprehensive adjustment from three aspects: mold, injection molding process and material. The core is to improve exhaust and material mobility. Mold adjustment is the fundamental solution to the air mark problem, mainly by improving exhaust. Add exhaust grooves: Open exhaust grooves on the parting surfaces or inserts around the grooves. The depth is usually 0.01-0.03mm and the width is 3- 5mm, providing a clear escape channel for gas.
If the melt flow speed is too low, the surface of the plastic product will solidify rapidly. As the flow resistance increases, the flow at the front end of the melt will become uneven, resulting in the inability of the previously solidified outer layer material to fully contact the cavity wall, resulting in wrinkles. These wrinkles will become irresolvable defects after being cured and pressure-maintained. For this defect, the solution is to increase the melt temperature and increase the injection speed. I hope the above content can help you, thank you.
Impact of material stains on product quality: (1) During injection molding, material stains appear on the product, which is a serious defect for parts with high appearance requirements. (2) For parts used internally and parts with not too high appearance requirements, they are light defects.
How to solve bubbles in PC transparent products
1. Generally speaking, if bubbles are irregularly dispersed on the surface of the product, they are mostly caused by water vapor. The hot melt of PC raw materials is very sensitive to moisture and requires a moisture content below 0.02%. Therefore, to control the moisture content, the raw materials must be fully dried.
2. Look at the place where air bubbles appear in your product. Whether it is at the end of the product filling or just at a place with thicker wall thickness. If it is the former, check the fit between the injection nozzle of your injection molding machine and the nozzle of the mold. The matching needs to be tight, the diameter of the nozzle is slightly smaller; and the taper of the nozzle should not be too large; the cold well is set correctly; the back pressure should be checked in the process, about 10bar; The mold is well vented.
3. Baking the PC material, setting the baking temperature to 130 degrees Celsius for 3 to 4 hours. During the injection molding process, increase the return dust temperature and appropriately adjust the back pressure. Under normal circumstances, if there are no problems with the raw materials, product quality can be effectively improved by adjusting the baking process parameters. In fact, the most direct way is to contact the supplier and ask them to send factory engineers to provide on-site after-sales services.
4. Bubbles appearing in the PC plastic injection molding process can be solved by optimizing mold design, strict raw material drying, cleaning equipment and adjusting process parameters. The details are as follows: Mold design optimizes wall thickness uniformity: Ensure uniform and consistent product wall thickness, avoid local Too thick or too thin leads to uneven cooling. Differences in wall thickness can cause internal stress concentrations, which can lead to the formation of bubbles. Smooth transition treatment: The transition part of the product needs to be gradually smoothed to eliminate sharp corners, sharp edges and gaps.
5. Definition of bubble: A cavity formed by gas gathering inside the product exists and has stable volume when opening the mold. Reason: Gas source: Water vapor, air, decomposition gas or solvent gas are not completely exhausted, and the gas is released when the pressure in the mold is insufficient. Process parameters: insufficient injection pressure/time, insufficient material quantity, and too high material temperature lead to insufficient gas dissolution. Mold structure: Poor exhaust and unreasonable gate position lead to gas retention.
Solution to bubbles in pc material injection molding
PC material for raw material processing has strong hygroscopicity and is prone to producing bubbles if its water content exceeds standard. It is necessary to ensure that the raw materials are sufficiently dried. It is recommended to control the temperature at 120-130℃ for 4-6 hours to ensure that the water content is ≤0.02%. At the same time, check whether the raw materials are damp, deteriorated or contain impurities. Process adjustment injection molding parameters directly affect the melt flow and gas exhaust. Priority can be given to increasing the injection speed to ensure that the melt fills the mold cavity quicklyIs PC material difficult to adjust with bubbles?; The injection temperature is recommended to drop to 260-320℃, which may lead to decomposition and gas production.
Improve from these three directionsIs PC material difficult to adjust with bubbles?1. Reduce material temperature (reduce flue gasIs PC material difficult to adjust with bubbles?generation). Second, slow down the injection speed (to help exhaust gas). 3. Increase the mold temperature (improve the impact of reducing the material temperature and speed on material flow). Fourth, fully ensure the drying of the material (the moisture content of PC material and PA66 must be less than 0.03%). 5. Enlarge the glue inlet point of the mold (conducive to the actual pressure retaining effect). Sixth, the back pressure increases (effectively increases the density of the material).
The problem of air lines on PC injection molding products can be solved by adjusting temperature, pressure, speed and mold exhaust. Properly increasing the temperature of the barrel will help gas escape, but the temperature should not exceed 270 ° C to avoid decomposition caused by high temperatures and affecting the properties of PC/ABS plastics.
The solution to shrinkage or bubbles in injection molding PC material parts is that the material needs to be dried, the mold must be vented well, and the injection speed must be adjusted well.
Common silver bubbles and vacuum bubbles in pc materials and solutions
1. Definition of vacuum bubble: The bubble point formed by the shrinkage of the melt during the demoulding and cooling process, and its volume increases with time. Reason: Insufficient mold filling: Insufficient injection pressure/time and insufficient material quantity lead to an incomplete mold cavity. Cooling shrinkage: The molten material solidifies quickly after contacting the mold wall, and the central part shrinks to form a hollow body. Low mold temperature: Local temperature is too low, resulting in uneven shrinkage. Solution: Process adjustment: Increase injection pressure/time and increase feed volume.
2. Solutions include: adjusting the melting temperature, fully drying the raw materials, controlling the injection rate, optimizing the equipment (selecting a small, specially designed, chrome-plated screw to avoid dead corners, dead materials, gaps, and cracks in the plasticizing system), and improving the operation Method (cleaning the barrel before starting up, avoiding cleaning PC material when using the barrel to store material).
3. PC material for raw material processing has strong hygroscopicity and is prone to producing bubbles if the water content exceeds the standard. It is necessary to ensure that the raw materials are sufficiently dried. It is recommended to control the temperature at 120-130℃ for 4-6 hours to ensure that the water content is ≤0.02%. At the same time, check whether the raw materials are damp, deteriorated or contain impurities. Process adjustment injection molding parameters directly affect the melt flow and gas exhaust.
4. Solution: Pay attention to adjustments in the injection molding process and molds, and conduct annealing treatment on the IC tray. For example, the PC material is heated to above 160 ° C for 3 - 5 minutes and then cooled naturally. Reason for bubbles: Water vapor and other gases in the resin cannot be discharged, or the mold is not filled enough, and the condensing surface condenses too quickly to form a "vacuum bubble". Solution: Strengthen the drying of raw materials and optimize the injection molding process parameters to ensure mold filling.
Bubbles appear in PC material of injection molding machine
Feed inspection: Check the core parameters such as melt index, water content, and shrinkage rate of raw materials according to batch. For example, the moisture content of ABS raw materials needs to be controlled below 0.02% to avoid bubbles and silver wire defects during injection molding; Raw material storage: Place the raw materials in a dry and ventilated warehouse, control the temperature at 18-25 ° C, and the relative humidity below 60%. Use a sealed material barrel to avoid moisture absorption, and give priority to use within 72 hours after opening.
It's easy to handle if you have a picture. This kind of bubble appears very common when making PC materials. It is mainly caused by trapped air, not by shrinkage of the material.
The problem of air lines on PC injection molding products can be solved by adjusting temperature, pressure, speed and mold exhaust. Properly increasing the temperature of the barrel will help gas escape, but the temperature should not exceed 270 ° C to avoid decomposition caused by high temperatures and affecting the properties of PC/ABS plastics.
The product produced by Wanhua pc-ol1107 is foggy. What should I do?
1. Raw material drying control PC materials are highly sensitive to moisture. Excessive moisture will lead to hydrolysis and degradation, resulting in fog or whitening. Professional drying equipment (such as dehumidification dryers) is needed to control the resin humidity below 0.02%. The drying temperature is recommended to be 120-130℃ for 4-6 hours to avoid too high temperatures (such as exceeding 130℃) causing the material to become brittle.
2. If there is fog problem in Wanhua PC-OL1107 injection molding products, it can be systematically investigated and handled through the following methods: raw material drying and quality control PC materials are highly sensitive to moisture and need to be strictly dried. It is recommended to use oven drying method, control the temperature at around 120 ° C (some brands do not exceed 100 ° C), and last for more than 4 hours to avoid the embrittlement or white fog of the injection molded parts due to residual moisture.
3. Wanhua PC-OL1107 injection molding products have fog problems, which are mainly solved from six aspects: raw material drying, mold temperature, injection pressure, release agent use, screw design and production environment. Control the moisture content of raw materials PC materials are particularly sensitive to moisture. If the raw materials are not sufficiently dried, residual moisture will evaporate to form bubbles or mist during the high-temperature injection molding process.
4. The problem of fogging of transparent injection molded parts requires targeted adjustments around the four dimensions of raw materials, molds, processes, and exhaust. Raw material treatment and drying treatment is the basis: if the raw material is damp (such as polycarbonate), it should be dried at 120-130℃ for 4-6 hours. The purity of raw materials is the key: raw materials with too much impurities need to be replaced with high-purity products to avoid internal turbidity.
This is the end of the introduction on whether pc material has bubbles that are difficult to adjust and how to adjust the bubble process parameters of pc material. BAY888.com The world's leading slot game platform, providing exciting gaming experience and generic rewards. Join now and start your journey to victory!
