6 Top Features of Small Injection Molding Machine
2021/12/24 By LZ
Features of injection molding technology
What is a small injection molding machine? Plastic injection molding is a manufacturing process commonly common to make items ranging from jewelry and toys to car body parts, cell phone cases, water bottles, containers, and more, out of plastic.
Many plastic products that we use in our daily life are from plastic injection machines. Just attach a specially designed mold to a product to create a series of products. Therefore, plastic products have a variety of shapes and sizes.
What is the working principle of a plastic injection molding machine?
A plastic injection molding machine is made up of components such as a feed hopper, screw, injection barrel, injection molding unit. The plastic granules are put into the spray barrel by the hopper. The resin placed in the hopper is usually in powder or granular form.
Some plastics, such as silicone rubber, may not require heating in small injection molding machine. The material is then melted using the friction of a reciprocating screw that comes with the heating rings.
The complicated process of small injection molding machine
The molten plastic is then pumped through the nozzle and into the mold cavity. When the plastic is fully injected into the mold cavity, the material is cool according to the shape of the mold. Once it is shaped and the mold opens, the product is getting.
Although it sounds easy, extruding plastic into the product is a very complicated process.
Pre-defined forming area – the mold is ending before the plastic is injected into the mold through the grooves, the door has a small cross-section.
The machining process consists of two processes:
Plasticization in small injection molding machine:
- Shape in mold.
- Also, High dimensional accuracy.
- Moreover, Short molding cycles from a few seconds to tens of minutes.
- Furthermore, High productivity, less labor to complete.
- In addition, Suitable for thermoplastic processing.
The injection molding machine is calm of the following main parts:
Small injection molding machine support system: helps to operate the injection molding machine
- Body (Frame)
- Also, Electrical system (Electrical system)
- Moreover, Hydraulic system (Hydraulic system)
- Furthermore, the Cooling system
b. Spray system of the small injection molding machine
The injection system is responsible for putting into the mold through the processes of plastic feeding, compression, degassing, plastic melting, liquid plastic injection, and product shaping. Including:
Hopper: contains pellets for feeding into the mixing chamber.
Barrel: holds the plastic so that the mixing visor moves back and forth inside it. The temperature around the storage chamber provides about 20-30% of the temperature needed to melt the plastic.
How to help maintain the temperature?
The small injection molding machine heater band helps maintain the temperature of the material chamber so that the plastic inside the cavity is always in a state of molten plasticity. On the machine, there are many heating tapes, set with different temperatures, creating suitable temperature zones for the injection molding process.
Screw: has the function of compressing, melting, and creating pressure to push the plastic to flow into the mold cavity.
Non-return assembly, non-return valve
This unit consists of a wedge guard, a screw head, and a seat. Its function is to create a stream of plastic shot into the mold.
As the screw retracts, the wedge-shaped barrier moves towards the nozzle and allows the plastic to flow forward towards the screw head. And when the visor moves forward, the wedge-shaped barrier will move in the direction of the hopper and close with the seat to prevent the plastic from flowing backward.
Connects the mixing chamber to the nozzle
And must be of a shape that ensures sealing of the mixing chamber and mold. During the injection of liquid resin into the mold, the nozzle should be aligned with the nozzle bush.
And the nozzle should be sealed with the concave part of the nozzle silver through the positioning ring.
The small injection molding machine clamping system has the function of opening and closing the mold, creating a clamping force to hold the mold during cooling and push the product out of the mold at the end of an injection molding cycle. Consists of:
Small injection molding machine ejectors:
It generate thrust to act on the ejector plate on the mold to push the product out of the mold
- Clamp cylinders
- Also, Electrical system:
Small injection molding machine Colling system
The Cooling system provides water or ethylene glycol solution to cool the mold, hydraulic oil and prevent the raw plastic in the hopper from melting because when the plastic melts, the upper raw plastic is difficult to run into the cavity plastic container.
The heat exchanger for hydraulic oil is about 90-120 degrees F. The water temperature controller provides the right amount of heat, pressure, and flow to cool the hot plastic in the mold.
2. Small injection molding machine Injection system (press system)
The injection system is responsible for putting plastic into the mold through the processes of plastic feeding, compression, degassing, plastic melting, injection of liquid plastic into the mold, and shaping the product. This system has the following components:
- Plastic Feed Hopper (Hopper)
- Also, Plastic storage compartment (Barrel)
- Moreover, Heater bands
- Furthermore, Screw (Screw)
- In addition, Non-return Assembly
- Also, Nozzle
Small injection molding machine Plastic supply slip:
- It contains plastic pellets to be supplied to the mixing chamber.
- Plastic compartment: contains plastic heated by heating rings
Small injection molding machine Heating rings:
They keep the temperature in the plastic chamber always in a state of molten plasticity. On a plastic injection molding machine, the heating rings are set to different temperatures to create the right temperature zones for the injection molding process.
Small injection molding machine Screw:
Small injection molding machine has the function of compressing, plasticizing, and creating pressure to push the plastic to flow into the mold cavity
The screw has a structure of 3 zones:
- the plastic feeding area
- the compression zone
- and the dosing area
Self-opening return or self-opening return valve: This unit consists of a wedge-shaped barrier, a screw head, and a seat. The function of creating a stream of plastic shot into the mold
As the screw recedes, the wedge-shaped barrier moves towards the nozzle and allows the plastic to flow towards the front of the screw head.
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