Design and Manufacture of PET and Polyethylene Molds

Blow molding is a specialized manufacturing process that creates hollow plastic parts, glass bottles, and industrial containers. At Temco Rubber Industrial Group, we engineer high-precision aluminum and steel blow molds tailored for PET, Polyethylene (HDPE/LDPE), and Polycarbonate (PC) applications with total dimensional accuracy.

Work Samples of Manufacturing PET & Polyethylene Molds

A showcase of precision aluminum PET bottle molds, ISBM preform tooling, and heavy-duty steel polyethylene blow molds built for high-volume industrial lines.

Multi-Cavity Aluminum PET Molds

Injection Stretch Blow (ISBM) Preform Molds

Heavy-Duty Steel HDPE Polyethylene Molds

Blow Molding Methods & Technologies

We deploy specialized tooling techniques to convert raw polymer granules and preforms into rigid hollow containers with minimal material waste.

Injection Stretch Blow Molding (ISBM) for PET

Stretch blow molding conditions or preheats a plastic preform to a specific temperature before placing it into a cooled aluminum mold. A internal stretch rod and high-pressure air needle rapidly expand the preform longitudinally and diagonally against the mold walls. This biaxial orientation dramatically increases clarity, barrier strength, and mechanical durability.

Maximum production efficiency for high-volume beverage and food bottles
Compatible with PET, Polypropylene (PP), PVC, and Polyacrylonitrile (PAN)
Preforms can be manufactured independently or sourced from third parties
Ideal for cylindrical, rectangular, or oval transparent and colored bottles

Injection Stretch Blow Molding ISBM Tooling for PET

Extrusion Blow Molding for Polyethylene (HDPE / LDPE)

In extrusion blow molding, thermoplastic compound is melted and continuously extruded downward as a hollow parison tube. The cool steel mold halves clamp over the parison, and pressurized air is injected into the tube, forcing the plastic against the mold cavities. After cooling, the mold opens, and the hollow part is ejected with precise pinch-off geometry.

Optimized for HDPE and LDPE polyethylene jerrycans, drums, and bottles
Heavy-duty tool steel construction guarantees long lifespan under continuous extrusion
Integrated cooling channels optimize cycle times and prevent thermal warping
High flexibility in wall thickness control and handles integration

Extrusion Blow Molding Tooling for Polyethylene HDPE

Blow Mold Tooling Classifications & Design Standards

Selecting the optimal mold material and engineering parameters ensures long-term mold durability and flawless bottle geometry.

Aluminum Blow Molds

Primarily engineered for PET and Polycarbonate (PC) bottles. Offers rapid thermal dissipation, short cooling cycles, and high polished surface finish.

Steel Blow Molds

Specially manufactured for LDPE and HDPE polyethylene containers. Resistant to sliding wear and continuous mechanical pinch-off forces.

Preform & Neck Finish Design

Meticulous calculation of preform weight, neck opening dimensions, thread pitch, and wall distribution to prevent structural collapse.

Venting & Draft Angles

Precision-engineered air exit micro-holes prevent vacuum pockets, while optimal draft angles ensure smooth, automated part ejection.

3D CAD DFM simulation of PET bottle blow mold and venting paths

Our PET & Polyethylene Mold Production Workflow

From initial 3D container design to high-speed CNC milling and trial blowing validation.

Container & Preform DFM

Evaluating bottle geometry, preform expansion ratio, wall thickness, and neck thread requirements.

Material & Cavity Selection

Selecting premium aircraft-grade aluminum or hardened tool steel based on annual volume targets.

CNC Tooling & Venting

High-precision 5-axis CNC cavity milling, neck polishing, and strategic air exit hole drilling.

Blower Machine Trial

Testing mold setup on industrial oven and blower machines to verify bottle strength and aesthetics.

Frequently Asked Questions

Technical answers grounded in our engineering documentation regarding blow molding technologies, materials, and pricing.

What is the difference between PET bottle manufacturing process and metal bottles? +

Plastic preforms are used to make PET bottles through thermal heating and air blowing, whereas metal cans are manufactured from metal sheets formed by stretching and cutting using press and hammer machines.

What points should be considered in the design of PET bottles? +

In the design of PET bottles, it is necessary to be very careful regarding the shape of the preform, the size of the neck opening and its weight, air exit holes, the mechanism of the mold and surface finish, as well as the exit draft angles of the final part.

How does plastic blow molding work? +

To achieve blow molding, the appropriate machine is selected according to material type and technique. Typically, polymer granules are injected or extruded into a hollow form, and air pressure expands the material against the cool mold walls to create the hollow container before demolding.

How many categories are there for blow mold design? +

Blow molds are mainly divided into two categories: aluminum molds (typically used for PET and Polycarbonate/PC bottles) and steel molds (typically used for LDPE and HDPE polyethylene containers).

What determines the price of blow molds? +

The price of blow molds is calculated based on the mold material selected (aluminum vs steel), container volume, design complexity, and the total number of cavities required.

What is a blow mold machine? +

Blow molding equipment includes specialized PET machines (ovens and blowers that preheat preforms before air expansion) as well as polyethylene extrusion blow devices that continuously lower a hollow gut parison into the mold to form the container.

What is PET? +

PET stands for Polyethylene Terephthalate, a high-grade plastic material widely utilized in the food, beverage, and hygiene packaging industries. PET preforms are processed inside specialized aluminum air molds to produce crystal-clear bottles.