Long term supply of the company PA612 Plastic raw materials, please call for consultation
PA612 is also called polyamide 612 or nylon 612,
In addition to the general PA characteristics, PA612 also has the advantages of small relative width, lower water absorption and density, good dimensional stability, high tensile strength and impact strength, and transparency
two purpose
PA612 is mainly used for making advanced toothbrushes and other industrial bristles, as well as accurate mechanical parts and Wire and cable Coated coating, oil pipeline, oil resistant rope, conveyor belt, bearing, gasket, etc., * * * can be used to make gun butts, helmets and military Cable etc. [1] . three Injection molding process
Drying treatment:
If the material is sealed before processing, then drying is not necessary. However, if it is stored container If it is opened, it is recommended to dry it in hot air at 85 ℃. If the humidity is greater than 0.2%, vacuum drying at 105 ℃ for 12 hours is also required Mold humidity:
80 ℃ is recommended. The mold temperature will affect the crystallinity, which will affect the physical properties of the product. For thin-walled plastic parts, if the mold temperature is lower than 40 ℃, the crystallinity of the plastic parts will change with time. In order to maintain the geometric stability of the plastic parts, annealing treatment is required
Injection pressure:
Usually 750~1250 bar, depending on materials and new product design
Injection speed:
High speed (lower for reinforced materials). Runner and gate: because PA612r has a short solidification time, the position of the gate is very important. The gate aperture should not be less than 0.5 * t (where t is the thickness of the plastic part). If a hot runner is used, the gate size should be smaller than that of a conventional runner, because the hot runner can help prevent premature solidification of the material. If a submerged gate is used, The smaller diameter of the gate should be 0.75mm [2]
four Defect treatment
Common defects and treatment of nylon 612 products Unstable injection pressure of nylon 612 Generally, this is the same as injection molding machine The nozzle hole is too small, because the nozzle is in contact with the mold for a long time, the mold temperature is very low 20-90 ℃, and the nozzle temperature is 240-280 ℃. There is a temperature difference between them, which will inevitably lead to heat exchange. When the temperature of the nozzle drops below the melting point of nylon, the nozzle hole is frozen, and the next injection will have a large pressure to open, resulting in pressure loss, However, after the injection pressure is increased, the mold will expand after several molds are produced. Seen from the phenomenon, the injection molding of the injection molding machine is unstable. In fact, the phenomenon that the nozzle hole is too small will disappear if the nozzle hole is enlarged. Solution to wavy flow marks generated during processing of nylon 612 products:
The mechanism is that the flow rate of the rubber in the mold cavity is too slow, and the frozen rubber cannot cling to the mold.
resolvent:
1. Increase injection speed
2. Increase mold temperature
3. Increase the barrel temperature
4. Properly increase the nozzle diameter or gate
Solution to silver wire generated during processing of nylon 612 products:
The production mechanism is that there is gas in the plasticized material. During injection, the gas is forced out on the surface of the mold, and white silk lines appear on the surface of the product.
resolvent:
1. Check whether the raw materials are wet or mixed with other raw materials
2. Check whether the raw materials are decomposed in the cylinder (cylinder temperature
The temperature is too high, and the screw speed is too fast)
3. Check whether the nozzle hole is too small
4. Check whether the mold temperature is too low
5. Poor mold exhaust
6. Whether the gate size is too small
7. The back pressure is too low, and the renewal material is applied too much
Solution to weld line generated during processing of nylon 612 products:
The mechanism is that the temperature of the rubber at the end of the flow is very low, the binding is poor, and the pressure transmission is weak, so that the two streams are not tightly combined.
resolvent:
1. Increase injection pressure and speed
2. Increase mold temperature
3. Increase material temperature
4. Improve mold
Solution to exhaust and shrinkage caused during processing of nylon 612 products:
The production mechanism is product injection or shrinkage.
If it is solved by injection molding
If it is shrinking, use shrinking method to solve it
Solution to the focal spot generated during the processing of nylon 612 products:
The production mechanism is that the rubber occupies the mold cavity at a high speed during injection. When the gas in the mold cavity cannot be discharged in time, this part of gas is compressed, and the products are scorched when the gas is heated after compression
resolvent:
1. Reduce injection speed or pressure
2. Reduce melt temperature
3. Improve mold exhaust
4. Reduce clamping force
5. Increase the nozzle aperture
Solution to bad demoulding during processing of nylon 612 products:
1. Improper control of mold temperature causes uneven shrinkage of each part, resulting in uneven wrapping force.
2. The injection residual stress in the product is large, which makes it produce large cladding force and makes it difficult to demould.
Solution to this problem:
1. Reduce injection and pressure maintaining pressure;
2. Reduce injection and pressure holding time
3. Increase or decrease the material temperature.
4. Raise or lower the mold temperature.
5. Check the draft angle of the mold
Solution to warpage and deformation of nylon 612 products during processing:
The mechanism is that the internal stress of the product is too large and the shrinkage of the product is uneven.
Excessive internal stress of products:
1. Reduce injection pressure, injection time, pressure maintaining pressure and pressure maintaining time
2. Raise the material temperature and mold temperature.
Uneven shrinkage of products:
1. Lower the material temperature, lower the mold temperature, and increase the cooling time.
2. Increase injection pressure, injection time, pressure holding pressure and pressure holding time.
Other reasons: 1. The gate position is set unreasonably
2. Unreasonable setting of product wall thickness
3. Unreasonable mold structure setting
Solution to nozzle salivation during processing of nylon 612 products:
This problem is often encountered in the production of nylon.
Main solutions:
1. Increase the back glue extraction.
2. Lower the material temperature and nozzle temperature.
3. Inadequate drying of raw materials.
4. Catapult nozzle
Solution to poor plasticization during processing of nylon 612 products:
1. Low back pressure
2. The barrel temperature is too low
3. Screw speed is too fast
4. Forming cycle is too short [1]
five Physical property table
Water absorption | | | | ISO 62 |
Saturation, 23 ° C | two point five | -- | % | |
Balanced, 23 ° C, 50% RH | one point one | -- | % | |
[3] Mechanical properties | dry | Adjusted | Unit system | test method |
Tensile modulus (23 ° C) | two thousand and two hundred | two thousand | MPa | ISO 527-2/1 |
Tensile stress (fracture, 23 ° C) | sixty | fifty | MPa | ISO 527-2/1A/5 |
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★ The company has sufficient supply of goods, complete varieties, reasonable prices, and preferential treatment for large quantities. * * * The original package will be delivered on the same day of ordering. Our company can provide raw material certification report; UL certification, FDA certification, material certification, ISO, ASTM physical property data, ROHS (SGS) report, MSDS physical property, quotation, UL report, RoSH standard, SGS test report, etc.)
★ Support logistics, express delivery and freight; It supports cash and bank transfer (can be collected by express in Guangdong Province)
★ After the raw materials arrive at the factory, please do not remove the outer packaging. First, carefully check whether the outer packaging of the raw materials is intact and whether the model of the raw materials matches the model of the raw materials you ordered.
★ After the goods are delivered, please check ahead. If a large number of packages are damaged and raw materials are leaked during the logistics process, please ask the logistics personnel to issue a certificate and keep it, and contact Liu Sheng of Dongguan Aoya Plastic Raw Materials Co., Ltd. within 24 hours.
★ If the goods are not received in time after delivery, please contact Liu Sheng of Dongguan Aoya Plastic Raw Materials Co., Ltd. in time
Ordering instructions: delivery within 24 hours after receiving the order, and delivery in Shenzhen, Huizhou, Dongguan and other regions. The price is preferential for a purchase of more than 1000kg. Welcome friends from all walks of life to order.
Our purpose: [to provide our customers with high quality at a preferential price. Our company has sufficient supplies, complete varieties and reasonable prices]
