There are 5 types of plastic molding that are considered to be the most effective and popular. The 5 types are extrusion molding, compression molding, blow molding, injection molding, and rotational molding.
What is Plastic Moulds?
By injecting heated molten plastic into a mold, then cooling and solidifying, the process is repeated and hundreds or thousands of parts are made.
Injection moulding is suitable for products with complex shapes that require mass production and accounts for a large proportion of the plastic processing field.
The Tirapid team conducts ODM for different industries. From mold design, drawing, production, and injection molding, there are specialists to follow up. Realize one-stop service for your products, worry-free production, high quality, and fast delivery time.
Quality Process Control
Plastic Moulding Process & Efficiency
The injection molding process directly affects the quality and price of parts, and the inspection before formal production is very important. Below are the items that Tirapid commissioners must check before production.
- Optimize dwell time by conducting gate seal or gate freeze studies
- Conduct cooling time studies to optimize cooling time for injection molded parts
- Pressure drop studies determine if the machine has enough pressure to move the screw at the set rate
- Perform a viscosity curve to determine injection speed
- Variation of melt temperature and packing pressure to optimize process window
Plastic Molding Cycle Time
The time required to mold the part is calculated as below:
Total time = 2M + T + C + E
(2M) = Twice mold on/off time
(T) = injection time (S/F)
(C) = Cooldown time
(E) = injection time (E)
(S) = Die Size (in3)
(F ) = Flow (in3/min)
Clamping and demolding times for injection molded parts can vary from one second to several minutes, depending on the size of the mold and equipment. Cooling time depends on the maximum thickness of the part.
Benefits of Plastic Moulding
- Very effective
- It provides high repeatability and reliability
- Materials can be reused
- Compatible with various materials and colors
- Tight tolerances, complex geometries. large quantities of uniform, complex parts
Application of Plastic Injection Moulding
Plastic injection molding can be used in many ways in life. Tirapid manufactures parts for the automotive industry, industrial products, consumer products, marine components, electronics, swimming pools, spas, POP displays and laboratories, and healthcare equipment, and much more.
Common injection-molded products such as combs and cell phone casings, as well as industrial products in the automotive, aerospace and oil industries. Other industrial applications for plastic injection molding include sewer systems, building services and construction, lighting systems, electrical systems, and welding services.
In consumer products, the application potential of plastic injection molding is unlimited.
Plastic Mould of Aluminum and Steel
Steel molds cost more to manufacture and last longer. High-grade steels like H-13 and S-7 are tough metals that can withstand the wear and constant pressure of injection molding. Steel grade PAS940 is the primary material for thermal conductivity.
“Bella is a very professional mechanical engineer. Whether it is sheet metal or plastic injection, he can give better advice at critical moments. We will keep ordering at Tirapid Manufacture. Happy cooperation!”
“Tirapid has enough experience in injection molding product parts, they can give a lot of useful ideas, can help me save more cost, and make my project complete faster, is very great company.”
“The quality of the mold is very high, especially the contact surface of the product. After listening to Rea’s suggestion, we hardened the mold core, which made the surface of my product look more textured.”
Tirapid is ISO 9001:2015 certified.
Tirapid complies with the production and manufacturing standards for automotive parts and other regulated products.
Tirapid has processed 100,000 types of parts, and the shipment pass rate has reached 98％.
The injection molding machine consists of four main parts: the base, the hopper, the barrel, and the clamping unit. There are also smaller components such as nozzles, ejectors, split molds, clamping units, injection units, and hydraulic units.
The cycle has four stages. These stages are clamping, injection, cooling, and ejection stages.
Start-up costs are high. Initial startup costs are high because custom tooling must be created for each injection molded part, which is not economical for low-volume production runs. The initial delivery time was long. Design changes are expensive.