Tips for Transparent Plastic Blow Molding Processing: Methods for Distinguishing Rolling Molded Water Tanks and Blow Molded Barrels

Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic preform obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the preform to blow and expand the plastic preform tightly against the inner wall of the mold. After cooling and demolding, various hollow products are obtained.

The principle of rotational molding is to quantitatively place plastic raw materials into a single walled closed mold, and the mold is installed on a bracket and can rotate. The heat source heats the mold, and the plastic absorbs heat and melts through the mold wall. It adheres and gradually accumulates on the mold wall. After all the plastic in the mold is melted, heating, cooling, and demolding are stopped to obtain the product.

Some simple methods can be derived from the plastic molding method, and blow molded products are all hollow inside; Injection molding has an injection port, so the formed product will have a small unnecessary part that will be cut off by a process. However, if you observe carefully, it can still be found; The biggest feature of rotational molding products is seamless.

The process is different, blow molding involves injection and blowing; Injection molding is a combination of injection and compression; Rotational molding is a combination of extrusion and compression. Nowadays, mold processing can be very precise, and analyzing the surface of the plastic part is not enough to distinguish it. Injection molded products generally have a smooth surface, while blow molded products are mostly matte. Blow molding can be used to make hollow products, but injection molding cannot. Injection molding has an injection port, while blow molding does not. Blow molding is generally based on HDPE. Generally speaking, injection molding is solid core, while blow molding and roll molding are hollow core. Blow molding is generally used for filling hollow products, such as water bottles, kettles, and various daily chemical products.

Both blow molded and roll molded products are hollow with uneven surfaces. The surface of the roll molded product is attached to the mold, and the material of the mold affects the tactile sensation of the product surface. Blow molded products have blowing ports, injection molded products have injection ports, and roll molding can be seamlessly formed. The plastic water tank processed by blow molding technology is lightweight, while the plastic water tank processed by roll molding technology is heavy, resulting in a much higher price.