How are the common plastic products around us made?

Plastic products are very common in our life, ranging from cups and bottles to various equipment. There are countless plastic products around us. But let's really talk about how these plastic products are made. I believe most people can't tell. So now let's simply understand the manufacturing methods of plastic products.

The common production methods of plastic products generally include the following seven production methods:

1. Compression molding

It is a method to achieve the desired shape by putting the resin into the mold and heating and compression. It is used to make plastic products with thermosetting resin, such as bowls, dishes, lids, etc.

2. Injection molding

This is a method of molding by injecting molten resin from the injection machine and pressing it into the mold. It is suitable for manufacturing large plastic products, such as sealed containers, barrels and other containers. CDs and DVDs can also be manufactured by special injection molding machines.

3. Calendering

This production method is similar to our usual method of rolling dough with a rolling pin. Put the resin between the heated rollers and stretch it to a predetermined thickness through several rollers to form the desired shape. It is suitable for manufacturing wide flat products, such as film, sheet, etc.

4. Hollow molding

This is a way to clamp the soft pipe extruded by the die in the middle, inflate the air at the top, and then mold according to the die. It is suitable for making all kinds of bottles, watering cans, etc.

5. Extrusion molding

This method is like a meat grinder, which feeds the resin from the into the production equipment, and transports the resin forward through the rotating screw while heating. The resin is molded while being sent out from the blowing nozzle, melted and extruded. It is suitable for manufacturing pipes and other products.

6. Vacuum forming

Vacuum forming is a method of heating the sheet or plate made in advance by calendering or extrusion to soften it, absorb the air in the mold and press it on the mold at atmospheric pressure. It is used to make thin containers such as lunch boxes and trays.

7. Inflatable molding

The pipe extruded from the extruder is still very soft, but the air blown out of the nozzle expands the pipe to form a film. Suitable for making films, such as plastic wrap and plastic bags. Because it is inflatable, it is called inflatable molding.