Stretch Blow Molding Manufacturers and Companies

IQS Directory is a top industrial directory listing of leading industrial stretch blow molding companies and suppliers. Access our comprehensive index to review and source stretch blow molding companies with preview ads and detailed product descriptions. These stretch blow molding companies can design, engineer and provide stretch blow molding services to your specifications and application need. A quick and easy to use request for quote form is provided for you to contact these stretch blow molding companies and suppliers. Each company has detailed profile information, locations, phone number, website links, product videos and product information defined. Read customer reviews and product specific news articles. We are the right resource for your information requirement whether its for a manufacturer of reheat stretch blow molder, blow molded stretch, injection stretch blow molding.

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  • The Basics of Stretch Blow Molding

    There are three dominant methods of blow molding; extrusion, injection and stretch blow molding. Extrusion blow molding is affordable to produce in small quantities and can handle many types of plastics. Injection blow molding is utilized for small containers that have close-tolerance threaded necks and wide mouths. Stretch blow molding is used for the production of mass quantities of beverage bottles, most commonly two liter containers. The bottles produced can handle carbonated pressures of around 60 psi and are capable of holding liquor, juice, mineral water, beer, cooking oils, milk...

  • Stretching the Mold

    Stretch blow molding is a special type of blow molding process. Typically, stretch blow molding is used to manufacturer hollow products, including the famous 2-liter PET bottles used to hold carbonated beverages. Plastic formed through blow molding is strong, lightweight, and durable. The process of stretch molding is similar to injection molding, but with a few differences. First, a mold is created with a small opening. A small stick of heated plastic is inserted into the opening. Compressed air is blown into the opening, which stretches the plastic stick. As...

  • 5 Advantages of Choosing a Turnkey Blow Molding Supplier

    You are probably familiar with a traditional blow molding supplier. They can process your part, as long as your part fits their existing machinery. A turnkey blow molding supplier, on the other hand, takes care of your project from start to finish. It sources and processes the resin you will use, designs and customizes your product, provides the equipment needed specifically for your project, and manufactures & ships your part. Instead of using separate vendors for each step of the blow molding process, you can build a strong relationship with...

Industry Information

Stretch Blow Molding

Stretch blow molding is a process that manufactures plastic containers, most commonly the two liter beverage bottle. It is able to produce uniform finished products that do not need to be joined and therefore do not have a visible seam. The bottles are strong enough to handle the pressure from carbonated beverages, which is about 60 psi. They also hold other beverage and food supplies like mineral water, liquor, juice, beer, cooking oils, peanut butter and milk.

Stretch blow molded bottles are most commonly made out of PET, or polyethylene terephthalate, which has a polymer microstructure with low permeability to gases and will not contaminate beverages. Stretch blow molded bottles are also made of thermoplastics like acrylonitrile butadiene styrene, polystyrene, polyvinyl chloride, polyamide, polycarbonate, polysulfone, acetal and polypropylene. There are two different types of stretch blow molding—injection stretch blow molding (ISBM) and reheat blow molding (RHB), both of which use injection molded preforms to produce plastic bottles, which are usually clear and colorless, but may have colored tints. The two step process is very fast and highly repeatable, with larger stretch blow molding machines producing between 15,000 and 20,000 bottles and hour.

There is one main difference between the two types of stretch blow molding. Injection stretch blow molding creates the plastic preforms out of loose pellets on site, often within the same inline conveyor system as the blow molding machine. Since this process requires the use of an injection molding machine, it is high in cost if not done in high runs. Reheat blow molding, on the other hand, does not injection mold the preform. Instead, these manufacturers purchase the preforms already-made and reheat them until soft and formable. Reheat blow molding eliminates the need for expensive injection molding machinery, which is a costly investment. The rest of the stretch blow molding processes are identical for both methods. The preforms are already made with the bottle neck, which may even have threading for twist-on lids or caps. A metal ram pushes the plastic, forcing it to stretch to the length of the mold cavity. Then, it balloons out by compressed air and internal pressure. The preform is stretched in hoop and axial directions and adheres with the shape of the mold walls. After it cures and cools down, the newly formed part is ejected from the mold. The process takes mere seconds to finish, and complex designs are possible. The bottles are all recyclable.

Stretch Blow Molding
Stretch Blow Molding
Stretch Blow Molding - Custom-Pak, Inc.
Stretch Blow Molding - Custom-Pak, Inc.

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