The core function of blow molds is to impart specific shapes and dimensions to molten plastic parisons by inflating them with compressed air and cooling them to form the desired hollow plastic products.

Blow molds are critical equipment in the blow molding machine process, determining the shape, dimensions, surface details, and appearance quality of the final hollow plastic products.

The blow mold itself does not produce the plastic parison; its process begins when it receives a heated and softened plastic tube (parison). Its specific functions include the following aspects:

Molding (Shaping):

• This is the most fundamental function. The mold has a cavity that exactly matches the shape of the final product.
• After the softened plastic parison is placed or injected into the mold, the mold closes, and high-pressure air is injected into the parison, causing it to expand like a balloon and adhere tightly to the cold inner wall of the mold cavity.
• Through this process, the plastic is shaped into the precise form designed for the mold cavity, whether it is a simple bottle or a complex automotive fuel tank.

Cooling:

• Molds are typically made of metals with good thermal conductivity (such as aluminum alloy or tool steel).
• The interior of the mold is designed with complex cooling channels through which circulating cooling water quickly draws heat away from the plastic, allowing it to solidify and set.
• Cooling efficiency directly determines production efficiency: the faster the cooling, the shorter the production cycle.

Surface Treatment (Texture and Gloss):

• The surface finish of the mold cavity directly determines the external gloss of the product. The more polished the cavity, the shinier the product surface.
• If special effects such as matte, leather grain, or geometric patterns are required on the product, these textures are processed onto the mold cavity through techniques like etching and then “replicated” onto the plastic product’s surface.

Detailing:

• Threaded openings: For parts such as bottle cap threads.
• Handles: Integrated handles for containers like water buckets or oil cans.
• Embossed text and logos: Brand names, logos, recycling symbols, etc., on the product.

About Suzhou Bestar Blow Molding Machinery Co., Ltd:

Beier Group and Bestar company are same owner And Bestar has been established for more than 19years. Bestar provides customers high efficiency, innovative, energy saving blow molding machinery solutions. Bestar blow molding machines sold to more than 60 countries.

Series blow molding machine is used for blowing 100ml-1250L HDPE PE PP products like milk bottles, daily chemical packaging bottles, jerry cans, pesticide bottles / medicine bottles and stacking barrels.

Please write your machine inquire Email, Phone Number and Company Name here, we will respond within 12h. Or you can directly contact us: Email: sales@bestarmachinery.com or at Whatsapp/Wechat +86 18862609888.