Injection molding is a manufacturing process that produces parts through injection molding machines and molds. Injection molding uses plastic molding molds to make thermoplastics or thermosets into plastic products of various shapes. Products usually use rubber injection molding and plastic injection molding.
KENENG has professional thermoplastic injection molding equipment and has the ability to provide customers with short-term to long-term, small batch to large batch production. We manufacture custom injection molded plastic parts, where custom injection molding needs are specific. So if you have a product in production and are looking for a higher level of custom injection molding service, you can contact KENENG. We’ll help develop the most efficient mold for your product and help you make your existing mold more cost-effective.

Our Injection Molding Advantages

High product qualification rate
We have a strict quality control system, and the product qualification rate is as high as 99%.

Recognized by international customers
We became the designated supplier of Medtronic and BBC.

Rich manufacturing experience
KENENG has more than 20 years of experience in injection molding manufacturing.

Sincere customer service
Our 24*7 online service will ensure you get instant quotes.

Rich export experience
We specially set up a subsidiary company for foreign trade business and have 15 years of foreign trade experience.

Have a professional factory
KENENG’s factory covers an area of 10,000 square meters and employs more than 150 people.

Obtained multiple certifications
KENENG has obtained ISO9001, ROHS, Dun & Bradstreet certification.

Strong market share
We have occupied 50% of China’s electronics market (Keyu series battery box and holder).
Products Display
Injection Molding Materials We Can Provide
KENENG’s factory has professional and advanced thermoplastic injection molding equipment, which can provide customers with a full range of customized services for various materials.
Polyethylene

- Polyethylene, abbreviated as PE, is a thermoplastic resin obtained by the polymerization of ethylene.
- Polyethylene resin is an odorless, non-toxic, white powder or granule with a milky white appearance.
- Low water permeability but high air permeability, not suitable for fresh-keeping packaging but suitable for moisture-proof packaging.
- The mechanical properties are relatively general, the tensile strength is low, but the impact resistance is good.
- The heat resistance is not high, and the low-temperature resistance is good.
- Low dielectric loss and high dielectric strength.
- It has good chemical stability. It is resistant to acid, alkali, and saline solution at room temperature, but it is not resistant to strong oxidants such as concentrated nitric acid.
- With low processing temperature and moderate viscosity, it is a kind of plastic with good processing performance.
Advantages of Injection Molding
- The production speed is fast and the efficiency is high.
- Automated operation is possible.
- There are many types to choose from: there are many varieties of colors, shapes can be simple or complex, and sizes can be from small to large.
- The size is accurate, the product is easy to replace, and it can be made into complex shapes.
- Injection molding is suitable for complex-shaped products or mass production.
Main Types of Injection Molding
Rubber Injection
The molding method of injecting the rubber material directly from the barrel into the model for vulcanization is called the rubber injection method. The advantages of rubber injection molding are short molding cycles, simple processes, high production efficiency, low labor intensity, and excellent product quality.
Plastic Injection
The molten plastic is injected into the mold under pressure, and after cooling and molding, the various plastic parts formed are called plastic injection molding. The most commonly used plastics are ABS, PA, polyethylene, polypropylene, polystyrene, etc.
The Process of Injection Molding
Temperature Control
The temperature that needs to be controlled in the injection molding process mainly includes barrel temperature and mold temperature. The temperature of the barrel mainly affects the plasticization and flow of the plastic. The temperature of the mold mainly affects the flow and cooling of the plastic.
- Barrel Temperature
Every plastic has a different flow temperature. Even if it is the same plastic, due to different sources or grades, the flow temperature and decomposition temperature are also different. The plasticizing process in different types of injection machines is also different, so the selection of barrel temperature is also different.
The barrel temperature is controlled in sections, which can be roughly divided into 3 areas:
1. Unloading area. In the area near the hopper, the temperature is generally set around the melting point of the plastic, and the temperature is lower. The purpose is mainly to preheat the material.
2. Plasticizing area. In the middle of the barrel, the temperature gradually rises above the melting point. The purpose is mainly to melt the material.
3. Anti-salivation section. It is at the front end of the barrel, the nozzle part. The temperature is usually slightly lower than the plasticizing section. The temperature of the nozzle should not be too low, otherwise, it will cause the early solidification of the melt to block the nozzle and increase the injection pressure, or the performance of the product will be affected due to the injection of the early solidified melt into the mold cavity. The purpose is mainly to prevent the molten material from flowing out of the nozzle under the action of internal pressure.
- Mold temperature
Mold temperature affects the intrinsic properties and appearance quality of the product. The mold temperature generally depends on the size and structure of the plastic product, the performance requirements for the finished product, as well as the melt temperature, injection speed, and injection pressure.