The working principle of the injection molding machine is similar to the syringe used for injection. It uses the thrust of the screw (or plunger) to inject the plasticized molten state (that is, the viscous flow state) plastic into the closed mold cavity. The process of obtaining products after curing and setting.

The injection molding machine is divided into a plunger injection molding machine and a screw injection molding machine according to the plasticizing method. According to the transmission mode of the machine, it can be divided into a hydraulic type, a mechanical type, and a hydraulic-mechanical (connecting rod) type. , Semi-automatic, manual injection molding machine.

3.1 Action program of injection molding machine
Clamping → Pre-molding → Reverse → Nozzle forward → Injection → Holding pressure → Nozzle backward → Cooling → Mold opening → Ejection → Door opening → Take workpiece → Door closing → Mold closing.

In 1932, the German FRANEBRAUN factory manufactured an automatic plunger horizontal injection machine. With the development of the polymer industry, the injection molding process and injection molding machine have also been continuously improved and developed.

The process of making plastic mold bai:
Plan review-preparation-processing-mold frame du processing-mold core zhi processing-electrode processing-mold parts processing-inspection-assembly dao-flying mold-trial mold-production.

Always check whether the injection molding machine is set up and running at the temperature specified on the record sheet. this is very important. Because the temperature will affect the surface finish and output of injection molded parts. All measured values ​​must be recorded and the injection molding machine checked at the specified time.

How to deal with the troubles we encountered when using the semi-automatic bottle blowing machine and share the precautions

Automatic bottle blowing machine temperature adjustment
When the automatic bottle blowing machine is processed, it is necessary to pay attention to some temperature control to ensure that a suitable plastic bottle is manufactured.

As a guide, generally the injection machine should be selected so that molded product volume will become 30%
to 80% of the machine's injection volume

When molding NOVADURAN, resin temperature should be generally about 240℃～265℃. Liquidity will be better as the temperature rises, but extremely high temperature will accelerate heat degradation which will end up with physicality deterioration of the molded article.

As for the injection molding machine, several types such as plunger type, plunger preplasticating type, screw preplasticating type and in-line screw type, etc. have been developed so far, but presently the in-line screw type injection molding machine

As for the molding of Iupilon / NOVAREX, either the hydraulic type or the toggle type is available.

The improvement of poor appearance of the moldings, the reduction of size unevenness between the molding shots, and the measures against sink marks, warpage and flash can be achieved by controlling the injection rate, holding pressure, screw rotation speed and back pressure with multistep program control at the time of injection

Defects to be encountered in molding of Iupilon / NOVAREX are almost similar to those of other plastic materials.
The defective causes and remedies of general grade and glass fiber reinforced grade

These results indicate that the degradation of the impact strength in addition to the generation of defective appearance is very large. Therefore, it is
important to use the dried pellets that the moisture content is lower than the above mentioned limit to have a good performance of Iupilon / NOVAREX.

Used in the case of single- cavity, or when placing the gate directly to the base of the molded product.Residual strain tend to occur because the injection pressure will directly apply to the molded product, but its
mold construction is most simple.

Practically, resin is a non Newtonian fluid with viscoelasticity, so viscosity will decrease if the shearing force get bigger and cross-section thickness and diameter get smaller. So the actual effect of pressure loss might be bit smaller than the formula above.

In the case of multi-cavity type, runner design will play an important role, because the dimension tend to vary widely. Family-cavity type, which molds the product with different cavity shapes simultaneously, is basically not recommended.

Design of the mold cooling circuit is very important because it will work as a heat exchanger that cools the resin when molding.

There are several ways to place a gas vent to the mold, but it can be classified broadly into the following three ways.
・ Gas venting from the divided face of the mold
・ Gas venting from the cavity and core part
・ Gas venting by other special way

Deformation and dimension change by warpage are often being a problem of PBT resin molded product.
Following factors are the cause of the warpage deformation, but actually it will happen when several factors
overlap intricately.

Generally, effect to the roundness by the gate type tend to be better in the following order.
Side gate ＜ Pin gate（double points） ＜ Pin gate （triple points） ＜ Center sprue gate

Triple or quadruple-point gate is preferred, since it can directly get in from longitudinal direction. In the
case of the side gate or submarine gate, make the runner go around and prevent the core from falling over
by making it two to three points

If the flow distance is long, there need to be a multipoint gate. In this case, attention against weld location is required. If the width of the molded product is large, setting up the multipoint pin gate on the centerline is good.

This shape will be affected a lot by the shape factor, so countermeasure by the molding condition is generally difficult. There is method that make difference in mold temperature, but it will accompany a hardship in facility aspect and management aspect.

（1） At the corner part, outside cooling will be faster than the inside, so this shape tend to deform towards the
inside direction.
（2） Remedying by placing the gate on the corner part is sometimes possible if it is GF reinforced grade.
（3） Lightening the corner inside part is effective. Make the recess part round, and do not make the sharp
corner.

Generally, warpage towards inside tend to be bigger as the span get longer, and it tend to be bigger on the long side, compared to the short side. Remedying by placing a rib on the inside, or placing a triangle rib on the corner part, is possible.

As stated above, PBT will degrade in physicality by causing hydrolysis if heat history is received without enough drying, so the drying of fractured product need to be well considered when recycling.

Proper recycled material mix rate depends on the recycled material quality, using grade, and product's demand characteristics, so cannot be completely defined. Therefore, decision of the limit of the recycled material ratio
should be made after sufficient check has been done.

For example, if the actual recycled material ratio is 30%, substitution method can be made by testing once in recycled material ratio of 50%. However, recycling will be influenced greatly by pulverization shape and water control, so sufficient confirmation is required.

Material for injection mold (plastic mold steel) is required to have sufficient strength, toughness, heat resistance, wear resistance, and good corrosion resistance, heat treatment hardness must be greater than 42-48HRC, cavity working surface needs to keep the surface roughness unchanged for a long time.Commonly used materials are 45, Tl0, TlOA, 9Mn2V, 3Cr2W8, etc.Therefore its electric discharge machining process basic rules are as follows.

Injection molding is a manufacturing process for mass production of parts.It is most commonly used for mass production of the same parts, usually on a scale of tens of thousands or even millions of times.

Mould design is an important part of the development process when considering the production of a new moulding. Some considerations are given below.

The injection molding machine is a special equipment that combines the thermal processing characteristics of plastics and the principle of metal melting and die casting. The first plunger injection molding machine, it was not until the end of the 1940s that a pre-plasticized screw injection molding machine was developed.

The injection molding machine is a special equipment that combines the thermal processing characteristics of plastics and the principle of metal melting and die casting. The first plunger injection molding machine, it was not until the end of the 1940s that a pre-plasticized screw injection molding machine was developed.

The commonly used methods for processing thermoplastics include extrusion, injection molding, calendering, blow molding and thermoforming. The processing of thermosetting plastics generally uses compression molding, transfer molding, and injection molding

Plastic injection molding is a molding method of injection and molding. Its equipment is called plastic injection molding machine, or injection molding machine for short. Plastic injection molding machine is the main molding equipment that makes thermoplastic and thermosetting plastics into various plastic products. Ordinary plastic injection molding machine refers to the most widely used horizontal,

Check whether there is any foreign matter in the hopper. No items are allowed to be stored above the hopper. The cover of the hopper should be covered to prevent dust and debris from falling into the hopper.