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How to find the best nylon injection molding manufacturer in China
There are a multitude of nylon injection molding manufacturers in China. This is because the Chinese population is highly interested in this type of manufacturing.
As a result, there are many companies that produce nylon injection molding products. It is important to find the right manufacturer for your needs.
When searching for a nylon injection molding manufacturer, it is important to consider the cost of materials and labor.
Additionally, you should research the company’s reputation and learn about their customer service skills. If you have questions or concerns, you can always contact the manufacturer directly.
The benefits of nylon injection molding
Nylon is a synthetic polymer. It is used in a variety of materials such as fabrics, clothing, and automotive parts, to name a few.
The nylon fibers are made from two components: lignin and the polysaccharide called methionine.
Nylon injection molding is a process used to create objects from plastics. It is a popular choice for products such as car parts, appliances, and clothing. The process is simple, but it has some impressive benefits.
One of the most popular benefits of nylon injection molding is that it can create high-quality products quickly. This is because the material is easy to work with and produces consistent results.
Additionally, nylon injection molding is relatively cheap to produce. This makes it an ideal option for companies that need high-quality products quickly but do not have the budget to spend on other experimentation and development costs.
How to get started with nylon injection molding in China
Design of components (7 days)
to supply 3D files
Parts Prototyping (if necessary)(2 -3 days)
Or Topworks side
Tool Design(3-7 days)
Tool Check and Mold Flow Analysis(1-2 days)
Tool Fabrication(3-8 weeks,it depends)
First Shots To Client(T1,3-4 days)
Tool Modifications and
Texturing (3-7 days,it depends)
In this stage, the texturing process is done, which is usually the last step before mass production.
Mass Production Run or Export
NSM is a process of injection molding plastic products by using nylon-based plastics. In China, there are many companies that offer a wide variety of nylon injection molding services. From small startups to major production players, the market for nylon injection molding in China is changing rapidly. Here are tips to get started with this growing industry:
1.Do your homework: Before starting an nylon injection molding business, it’s important to do your research and identify the specific needs of your target market. This will allow you to create a tailored plan that fits their specific preferences and needs.
2. Find the right part supplier .The next step is to find the least expensive area on a particular nylon injection molding part. This can be accomplished by searching for suppliers using the search engines Alibaba.com.cn or Baidu.com, or getting in touch with area service providers.
3.Get a good partner: If you want to succeed in nylon injection molding, it’s important to find a partner who shares your same vision and goals. partnering with someone who’s committed to success will help you reach your goals quickly and efficiently.
Why those important for injection molding cost
- Part size- bigger parts mean a bigger mold, which means that bigger steel will increase the steel cost for the injection mold.
- Part design- the more complex a part is, the more detailed the mold has to be. Some complicated parts will require special features to be added, such as lifters or sliders. Therefore, you should be open to advice from your mold maker and see if there’s anywhere that you can alter the part design to save on injection mold costs.
- Materials: Depending on the part material of choice, the injection mold will have to be made of a particular material. For instance, if corrosive plastic-like PVC is to be used, the mold will have to be stainless steel to avoid any damage, ultimately bump the price up.
- Part finish requirements- where parts have high gloss surface requirements, then more expensive steel and precise technical polishing will be vital, adding to the price.
- Production volume- higher volume molds need more cavities, and so the mold will be larger. They also require a higher steel grade to last for longer, which impacts the injection mold cost.
- Country of manufacture- different countries have different wage rates. If your mold is made in a country where labor costs are low, then you’ll naturally save money. In China, the average cost of an injection mold is around 40% less than in western nations.
Nylon Injection Molding
High mechanical strength
The tensile strength is higher than that of metal, and the compression strength is equal to that of metal, but its rigidity is lower than that of metal.
Tensile strength is close to yielding strength, which is more than twice as high as ABS.
It has a strong absorption ability to shock and stress vibration, and its impact strength is much higher than that of the other plastics and superior to acetyl.
The fatigue resistance
and the parts can still maintain the original mechanical strength after repeated bending.
PA is often used in escalator handrails, bicycle plastic cycles, and other circumstances where periodic fatigue is pronounced.
High softening point and heat resistance
nylon 46 injection molding has a high thermal deformation temperature and can be used for a long time at 150 degrees.
After being reinforced with glass fiber, PA 66 injection molded part has a thermal deformation temperature above 250 degrees.
Smooth surface, small friction coefficient, and wear resistance
Nylon injection molding has self-lubricating property and low noise when used as a movable mechanical component. It can be used without lubricant when the friction effect is not too high.
If lubricant is needed to reduce friction or help heat dissipation, water, oil, grease, etc., can be selected. Therefore, as a transmission component, its service life is long.
Excellent electrical performance
Nylon has good electrical insulation, high volume resistance, and high breakdown voltage resistance.
It can be used as power frequency insulation material in a dry environment and has good electrical insulation even in a high humidity environment.
The product is light in weight and easy to dye. Due to its low melt viscosity, it can flow rapidly.
It can be quickly injection molded, so the molding cycle is short, and the production efficiency is high.
How to process Nylon injection molding:
Vacuum drying: 95-105℃ for 6-8 hours
Hot air drying: temperature 90-100℃ for 4 hours.
Crystallization: Except for transparent nylon, nylon is a mostly crystalline polymer with high crystallization.
The tensile strength, wear resistance, hardness, lubricity, and other product properties are improved. At the same time, the coefficient of thermal expansion and water absorption tends to decrease, but it is unfavorable to its transparency and impact resistance.
Mold temperature has a great influence on crystallization.
High mold temperature results in high crystallization, while low mold temperature results in low crystallization.
Shrinkage: Similar to other crystalline plastics, nylon resin has a larger shrinkage rate.
Generally, the shrinkage of nylon will greatly affect crystallization, and the shrinkage of products with large crystallization will also increase.
In the molding process, the shrinkage will decrease if the mold temperature is lowered, the injection pressure increases, and the material temperature is lowered.
However, the internal stress of the products is increased and easy to deform.
The shrinkage rate of PA 66 is 1.5-2%。
Nozzle: When nylon is injected, the “drooling of nozzles” shall be prevented. Therefore, self-locking nozzles are generally selected for processing nylon injection molding.
Products and moulds
The flow length ratio is between 150 and 200. The wall thickness of the nylon injection molded part is not less than 0.8 mm and generally between 1 and 3.2 mm.
The shrinkage of nylon injection is related to the wall thickness of the nylon part.
The greater the shrinkage will be, the thicker the wall thickness is.
Venting: nylon material venting slot height is about 0.03 mm, so the slot height should be controlled below 0.025.
Mold temperature: For the thin wall product is hard to fill, the mold must be heated and controlled.
Coldwater is generally used to control the temperature if the product needs certain flexibility.
Nylon is a crystalline polymer, so its melting point is fixed.
The barrel temperature is related to the performance of the resin itself, equipment, and the shape of the product. The barrel for nylon injection molding is 260℃.
Due to the poor thermal stability, it is not suitable to stay in the barrel at a high temperature for a long time to not cause discoloration and yellowing of materials.
At the same time, due to the good fluidity, it will flow rapidly after the temperature exceeds its melting point.
- Injection pressure
Nylon melt has low viscosity and good fluidity, but its condensation speed is fast.
It is easy to be short-shot in products with complex shapes and thin wall thickness.
So nylon injection molding needs higher injection pressure.
Usually, if the PA injection pressure is too high, the product will get flash.
If the pressure is too low, the products will have defects such as prints, bubbles, weld marks, or short-shot.
The injection pressure of most nylon varieties is not more than 120MPA and is generally selected within the range of 60-100 MPA.
As long as the products do not have defects such as bubbles and dents, it is generally no need to adopt higher maintaining pressure to avoid increasing the internal stress of the products.
- Injection speed
A faster injection speed can prevent ripples and insufficient mold filling caused by too fast a cooling speed for nylon injection molding.
The effect of fast injection speed on product performance is not obvious.
- Mold temperature
Mold temperature has a certain influence on crystallization and shrinkage.
When the mold temperature is high, the crystallization, abrasion resistance, and hardness of nylon products will increase, and molding shrinkage will increase.
Low mold temperature injection molding will lead to low crystallization, good toughness, and high elongation.
The injection temperature and drying temperature must be high; The injection pressure and holding pressure should not be too high or too long, and it should be injected at high speed. Venting channels should be cut to avoid burning; Back pressure 50 ~ 150 kg/cm2
Nylon should never be injected until they are dry completely. Because of the high moisture content, the material is easy to get stuck in the screw groove of the feeding section, which makes it difficult to feed
During injection, the nozzle is the easiest section to get cool. If the injection pressure is increased during cooling, the non-return valve will break easily, so the temperature control at the nozzle must be appropriate. In order to prevent the nylon from flowing into the mold, a controlled nozzle should be used.
When using other plastics material instead of nylon, it should be noted that the heating temperature of the nylon is above 270℃, while the melt temperature of the common plastic material is only about 200℃, so it is necessary to heat the cylinder to the melt temperature of nylon before operating; otherwise, the non-return valve of the screw is easily broken.
To prevent the NG products, the precision plastic mold must be adopted.
The design of products should avoid surface sink marks and consider dimensional stability.
Nylon injection molding shrinkage is about 1.5~2.5%
The heating temperature of PA6 is 220~300℃; mold temperature is 100~160℃, barrel temperature is 200~260℃, ejection temperature is 220~300℃, ejection pressure is 700 ~ 2000 kg/cm, lowest nozzle injection temperature is 225℃, melting point temperature is 215℃.
- section 1:230℃
- section 2:230℃
- section 3:220℃
- section 4:210℃
The second stage is 230℃; The third stage is 220℃; The fourth stage is 210℃; The plastic temperature is 25~70℃. Linear expansion coefficient 0.000083/℃, molding shrinkage 0.6~2.1%, specific gravity 1.1~1.4, thermal deformation temperature 149~185℃.
The temperature of PA66 injection molding: 250~380℃, mold temperature: 30~100℃, barrel temperature: 240~300℃, injection temperature: 250~310℃, ejection pressure: 600 ~ 2100 kg/cm2, lowest injection temperature: 260℃, melting temperature: 215℃. The injection molding shrinkage is 1.3~2.4%, the specific gravity is 1.1~1.4, and the thermal deformation temperature is 66~86℃.
- nozzle 235~265℃,
- front section 235~245℃,
- middle section 210~240℃,
- rear section 195 ~ 230℃;
The screw speed is 100-105 rpm, and the backpressure is 5-10 kg/cm2