Injection Stretch Blow Molding




PET and Stretch Blow Molding

PET bottles, with their lightweight clarity, are the packaging of choice for much of the food and personal care industry.  Stretch blow molding is the common method for producing PET bottles. Stretch blow molding can be a 1-Step or 2-Step process depending on the requirements of the package.  The 2-Step process, similar to that of injection blow molding, begins with an injection molded perform. The preform then undergoes the stretch-and-blow process.

Here are some of the many reasons PET is selected for a package

Crystal Clear - Glass-clear presentation of the product.

Pure - Products taste good. PET complies with international food contact regulations.

Safe - PET bottles are tough and virtually unbreakable during production, storage and transportation. If they do fail, they split, not shatter. Their high impact and tensile strength makes them ideal for carbonated products.

Good Barrier - The low permeability of PET to oxygen, carbon dioxide and water means that it protects and maintains the integrity of products giving a good shelf life. PET also has good chemical resistance.

Lightweight  - 10% weight of an equivalent glass pack, PET bottles reduce shipping costs by about 30%, and because the material in the wall is thinner, shelf utilization is improved by 25% on volume compared to glass. High strength, low weight PET bottles can be stacked as high as glass.

No Leakage - Absolute closure integrity is possible because of the injection molded neck finish. The absence of a weld line in the base means that PET bottles don't leak.

Design Flexibility - Suitable for containers of all shapes, sizes, neck finishes, designs and colors.

Recyclable - Excellent environmental profile due to single material. Used PET bottles can be washed, granulated into flakes and reshaped as PET bottles or employed as material for strapping, carpeting, fiber filling, etc.. PET is made from the same three elements (carbon, oxygen, and hydrogen) as paper, and contains no toxic substances. When burned, it produces carbon dioxide gas and water, leaving no toxic residues.

Long Shelf-life - Very good shelf-life performance.