Injection Molding Process

Plastic injection molding requires three primary components – an injection molding machine, a mold, and raw plastic material. Molds for plastic injection consist of high strength aluminum and steel components that have been machined to operate in two halves. The mold halves come together inside the molding machine to form your custom plastic part.

The machine injects molten plastic into the mold, where it solidifies to become the final product. The injection molding process is actually a complex process with many variables of speed, time, temperatures and pressures. The complete process cycle for making each custom part can range from no more than a few seconds to several minutes. Below we offer you a very brief explanation of four steps of the molding process.

STEP 1 Clamping

Before the plastic is injected into the mold, the machine closes the two halves of the injection mold with tremendous forces which prevent the mold from opening during the plastic injection step of the process.

STEP 2 Injection

Raw plastic, generally in the form of small pellets, is fed into the injection molding machine at the feed zone area of a reciprocating screw. The plastic material heats up by temperature and compression as the screw conveys the plastic pellets through heated zones of the machine barrel. The amount of melted plastic that is conveyed to the front of the screw is a strictly controlled dosage because that will be the amount of plastic which will become the final part after injection. Once the proper dosage of melted plastic reaches the front of the screw and the mold is fully clamped, the machine injects it into the mold, pushing it into the endpoints of the mold cavity under high pressures.

STEP 3 Cooling

As soon as the molten plastic contacts the internal mold surfaces, it begins to cool. The cooling process solidifies the shape and rigidity of the newly molded plastic part. The cooling time requirements for every plastic molded part depends on the thermodynamic properties of the plastic, the wall thickness of the part, and the dimensional requirements for the finished part.

STEP 4 Ejection

After the part is cooled inside the mold and the screw has prepared a new shot of plastic for the next part, the machine will unclamp and open the plastic injection mold. The machine is equipped with mechanical provisions that work with mechanical features designed within the plastic injection mold to eject the part. The custom molded part is pushed out of the mold during this stage and once the new part is fully ejected, the mold is ready for use on the next part.

Injection Process

Our Company

The factory covers an area of 10,000 square meters Production equipment has the original American imported Haas CNC machining center, wire-electrode cutting, electrical discharge machine,Perforating machine, injection molding machine, CNC milling machine,CNC hobbing machine, CNC lathe, CNC milling machine, CNC lathe, CNC milling machine, grinding machine and other machinery and equipment.

FAQ

Q1. Can only samples be produced?

A1. Yes.

Q2. What is the accuracy of the products processed by the drawings?

A2. Different equipment has different accuracy, generally between 0.05-0.1

Q3. What craftsmanship do you have for processing accessories?

A3.According to different products, different processes are used, such as machining, extrusion, injection molding, etc.

Q4. What areyour processing equipment?

A4. CNC machining center, CNC lathe, milling machine, engraving machine, injection molding machine,extruder, molding machine.

Q5. Can you help assembling the product after it is made?

A5. It's okay

Q6. What certifications or qualifications does your company have?

A6. Our company’s certificates are: ISO, ROHS, product patent certificates, etc.

Q7. Can injection products be surface treated? What are the surface treatments?

A7. It is ok. Surface treatment: spray paint, silk screen,electroplating, etc.