Blow Molding/

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.

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R & D Molders, Inc.
Georgetown, TX
512-763-3600
Since 1974, R&D Molders has been a leader in stretch blow molding. R&D Molders offers a range of stretch blow molding products. At R&D Molders, quality, value, experience and dedication is what we live by. Visit our website today for a gallery of our products as well as a tour of our plant. We look forward to hearing from you! Thank you for considering R&D Molders.
 
Agri-Industrial Plastics Company
Fairfield, IA
641-472-4188
Since 1978, Agri-Industrial Plastics growth and expansion has been consistent over our history and our reputation in the stretch blow molding industry is solid. We invest in only the best equipment available and have a dedicated team of associates from diverse professional backgrounds that contribute a base of knowledge, experience and a passion about what we do every day.
 
Custom-Pak, Inc.
Clinton, IA
563-242-1801
Some molding companies have difficulty molding the parts required by customers. At Custom-Pak, we have the capabilities to meet your needs on time, at the lowest price and with consistently great quality. About 600 blow-molding personnel have the training and the tools to produce stretch blow molding to your exact specifications. Visit our website where you can view a list of our capabilities.
 
Penguin, LLC
Sturgis, MI
269-651-9488
Established in 2002, Penguin LLC has been a leading manufacturing facility for stretch blow molding. As a fully integrated supplier, Penguin offers the highest level of customer focus, engineering/design consulting, low cost manufacturing, and state of the art logistics. Penguin also supplies metal fabrication, powder coating, assembly and packout, and warehousing and distribution. Call us today!
 
Premium Plastic Solutions LLC
Latrobe, PA
724-424-7000
At Premium Plastics Solutions LLC, we have a wide range of machine size capabilities from 1 to 75 pounds making us one of the most versatile stretch blow molding facilities in the industry. Our products come in a variety of sizes, weight, dimensions, leaving customers to customize for any specific project. Visit our website to day; we are ready to assist you with your next molding needs.
 

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Cado Company
Fitchburg, MA
978-343-2989
Cado Company is dedicated to providing you with the highest quality stretch blow molding products. Our goal is to meet or exceed our customer`s outlook. Whether it`s product design, mold build services, component production needs or all of the above, we want you as our customer. Depend on Cado to fulfill your needs and help you attain success with your molding products. Visit our website today.
 
Blow Molded Specialties, Inc.
Foley, MN
320-968-7251
At Blow Molded Specialties, we are driven to serve BMS customers and to provide the marketplace with a premier source for excellent service and quality at a fair and competitive price. Our stretch blow molding comes in a range of sizes, weights, resins, additives and much more. If you are looking for some specific and don't see it on our website, call our company for more help.
 
Blow Molded Products
Riverside, CA
951-360-6055
Blow Molded Products` experience in molding allows us to design and manufacture those tough jobs others can`t. From conception to completion, Blow Molded Products` team of experts will turn your stretch blow molding design into a finished product you can be proud of. Always expect excellent results at affordable prices; let us be your source for stretch blow molding.
 
Pinnacle Plastic Products, Inc.
Bowling Green, OH
419-352-8688
At Pinnacle Plastic Products, their expert work force is on the job around the clock stretch blow molding, assembling and packing a variety of products for customers all over the world. Having created more than 4,000 complex sizes and shapes, they produce component parts as well as complete assembled products that are fully packed and ready to ship into retail distribution.
 
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Industry Information

Stretch Blow Molding

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.