Introduction to Plastic Screw

Plastic screws, also known as plastic screws, China's common plastic screws for the hot melt injection molding processed into the key materials to distinguish: polyester Pa66 screws, PP screws, PVC screws, PE screws, etc., the characteristics of the material is different, and thus the application areas are also different.

Since the 1970s plastic products in industrial production work and life in a wide range of applications gradually, plastic products into the chemical and petroleum industries in a very important branch, in many major applications have been applied. Compared with traditional metal screws, plastic screws have excellent performance in various aspects.

First, according to the material

Polyester screws, PC screws, PVDF screws, PP screws, PTFE screws, PEEK screws, PPS screws, PFA screws and PI screws.

Second, according to the type of screw head

Pan head plastic screws, countersunk plastic screws, hexagon socket plastic screws, hexagon socket plastic screws, plastic set screws and so on.

Three, according to the slotted appearance points

Cross, a word (slotted), hexagonal, meters, red plum blossom, etc..

Fourth, according to the specifications of the screw thread type

Metric inch screw thread M2,M2.5,M3,M4,M5,M6,M8,M10,M12

Inch thread 2-56,4-40,6-32,8-32,10-32

According to the above categorization is not the same can be combined with many different types of plastic screws

Plastic screws performance index values

The most important physical performance index value

(1) Torsion resistance of the head and screw joints

(2) Head groove, especially the head of the cross is not in line with the requirements of the head specifications of the screw reamer.

(3) The specification of the outer diameter, middle diameter and bottom diameter of the threads of plastic screws should be standardized. Due to the water absorption capacity of different plastics caused by different application conditions of the specifications of the difference, this specification is not as harsh as the metal material screws.

The most important organic chemical performance index value

(1) Acid resistance

(2) Alkali resistance

(3) Flame retardant grade

(4) Insulation performance

Advantages of plastic screws

(1) Compared with ordinary metal screws, the main advantage of plastic screws is that his insulation layer performance is good, conductive.

(2) In addition, because of non-metallic materials manufacturing reasons, in the electric flow or other electronic signals to promote the electromagnetic interference will not cause vortex, etc., and its anti-interference a little suitable for communication and other fields.

(3) plastic screws temperature resistance is more appropriate, in which the better PVDF screws followed by Polypropylene, they have strong corrosion resistance, and polyester screws compared to the first two, resistance to strong oxidizing agent performance is very poor, therefore, in some electroplating industry strong acid and alkali environments, plastic screws, especially PVDF screws have a wide range of applications.

The shortcomings of plastic screws

(1) The main disadvantage of plastic screws is that ordinary plastic screws torque and strength than ordinary metal screws, torque over a large slip wire or head fracture is likely.

(2) Due to different plastic molding shrinkage causes, temperature and wet and cold changes and the length of the production cycle or other reasons plastic screw size deviation allows large. In addition, due to the general plastic material is too soft, can not use the conventional ring gauge measurement method.

Application range of plastic screws

Plastic screws have insulation, carbon free, corrosion resistance, beautiful, never rust and other major features, and modified materials engineering projects plastic, the use of compressive strength of the product, impact resistance can be compared with metal materials, people often say that the plastic screws, alias polyester screws with 30% glass fiber, it is far superior to the performance of mechanical equipment than the general polyester, plastic screws selection of materials is becoming increasingly diversified, the performance of the continuous improvement, the main purpose has become more and more broad. The main use also becomes more and more open.

(1) Medical equipment enterprises (insulation, carbon free, environmental protection, anti-electromagnetic interference, so that the application of diagnosis and treatment of industrial equipment with a high safety factor)

(2) Wind power enterprises (main chassis power supply circuit PCB board isolation, insulation layer)

(3) Aerospace industry (insulation layer on electronic products, anti-electromagnetic interference)

(4) Office supplies field (never rust, beautiful and practical)

(5) Chemical and petroleum industry (heat resistance, solvent resistance, corrosion resistance, increase the service life of the equipment)

(6) Electronics industry (insulation layer, anti-interference, lighter weight)