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Blow Molding and Injection Molding: Key Differences

Blow Molding and Injection Molding: Key Differences
November 2, 2017 sdcpm
Plastic blow molded bottles

Blow Molding and Injection Molding: Key Differences


When it comes to plastics, blow molding and injection molding serve two distinct, yet important purposes. The type of project you have in mind will ultimately determine which method is right for you. Luckily Valencia Plastics has got you covered, no matter what.


Blow Molding

Blow molding is used for plastic items which are going to be hollow on the inside. For example, items such as bottles, containers, or tubs. Two halves of the mold are created to make the shape itself. The mold is then put around the plastic and then, as the name suggests, air is blown into it until the plastic takes the shape of the mold. The mold is then removed, and the plastic is perfectly shaped. With blow molding, it’s important to keep a close eye on things, because air leaks are possible. This is easily taken care of by ensuring there are no gaps in the mold before the air is blown. There are a number of benefits to blow molded plastic, including cost-effectiveness and ease of automation.


Injection Molding

Injection molding, on the other hand, is used for solid pieces of plastic. The mold is already formed into the correct shape and is filled with the hot resin. Rather than having the mold put together, the resin creates pressure to hold the mold in place. For this method, it is critical to make sure the mold is correct, as it’s very difficult to reshape the plastic once it’s poured.


Valencia Plastics is ready to take care of all your plastic custom blow molding or injection molding needs. If you have any questions or are ready to discuss your next project, be sure to contact the experts at Valencia Plastics.


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