TPE Plastic

Customer selection priority TPE plastic

TPE plastic is one kind of popular Thermoplastic Elastomer material. To save investment costs and make good quality plastic injection moulding products. Usually, customers always like to use plastic mould making ways to make soft material.  But usually, injection-molded plastic parts with TPE plastic can not keep good quality. Today let us discuss how to make nice quality plastic parts with plastic injection moulding production in China.

TPE Plastic Moulding speed

1.A screw speed

the delay time of the back pressure and screw. The screw speed should be set so that the screw can be fully retracted in a timely manner. Usually, 2 – 3 seconds at the mould opening, for the next TPE plastic moulding.

The typical screw speed range of 50 – 150 revolutions per minute. If the screw is retracted too fast, and the machine has screw delay timer. You should set the delay time so that the screw is fully retracted and the delay time after the mold is the smallest. This will shorten the residence time of the TPE plastic at this temperature as well as in the rest time of the machine bore. Increase the backpressure will increase the material shear heating phenomenon. the backpressure normal setting range is 50 – 150 psi. When mixed masterbatch should be used in a high back pressure to achieve optimum dispersion state.

2. Plastic moulding speed

If possible should be so set the plastic moulding velocity control procedures. first, quickly filling the flow channel system, and then reduce the speed when the material begins to flow into the cavity through the gate. Maintain this speed until the workpiece 90% filled. Then further reduced speed to completely fill the mold cavity, but it does not occur an overflow of the workpiece material.

TPE Plastic moulding and transition pressure. If the machine does not by filling to control the speed. it should be set the plastic moulding pressure so that the flow channel system and the mold cavity sufficient to be filled. Within a time of about 1-5 seconds. Adjusted to approximately the initial transitional pressure-filled with the workpiece.

3.mold cavity to the desired injection pressure 50%.

This will help to reduce the plastic moulding pressure during the filling and packing stages to a minimum. When the TPE plastic moulding volume should be set to monitor the amount of buffer, to ensure that it can be maintained in the filling and packing stages. The transition to the filling and then holding pressure from the supercharger.

Newer TPE plastic moulding apparatus provides additional options for supercharging. From the injection to the filling and packing stages of the transition. From the supercharger to the filling phase of the transition is the most accurate method. It is based on the position of the screw to control. Making processing according to the position, the screw can consistently to a certain volume of material injected into the mold cavity. It also provides for the filling of the workpiece and densification precise control, and to help prevent the collapse of the workpiece and the hole.

Time is another way

Time to control the transition, but not recommended. Cavity pressure control transition is a costly approach. because it is involved in the installation of the workpiece mold cavity pressure sensor. When this process is required to achieve high precision plastic moulding tolerances. Reduce from the supercharger to the transition between the pressure in the filling and packing stage. It will help to control the bush at the top end of the drip. If the injection apparatus is provided with the pressure of the filling and packing stage control program can be used to reduce the speed of the flow channel leading and pressure

TPE Injection molding time

The best time of the full flow channel system is approximately 0.5 to 1.5 seconds. Fill the cavity should spend 1-5 seconds. If possible, it is best controlled by controlling the plastic moulding speed, fill time.

 Dwell TPE time

The dwell time should be set in front of the gate solidification. Typically, the size of the gate of the dwell time is a decisive factor. The larger the gate, the gate before setting the longer dwell time.

Cooling TPE time

The cooling time is mainly dependent on the melt temperature, the wall thickness of the workpiece, and cooling efficiency. In addition, the hardness of the material is also a factor. Compared to the very soft varieties (Shore hardness <20A), the relatively rigid varieties within the mold will be rapidly solidified. For a medium hardness SEBS composites typical workpiece, if cooling from both sides, then every 0.100 “wall thickness and the required cooling time will be about 15 to 20 seconds. Overmold a workpiece will take a longer cooling time because they can be effectively cooled by a smaller surface area per 0.100 “wall thickness required cooling time will be about 35-40 seconds.