Blow molding

Blow molding is the process of inflating a hot, hollow, thermoplastic preform or parison inside a closed mold so its shape conforms to that of the mold cavity. A wide variety of hollow parts, including plastic bottles, can be produced from many different plastics using this process.
There are three basic blow molding processes:
Stretch Blow Molding;
Injection Blow Molding;
Extrusion Blow Molding.
Stretch Blow Molding
This process involves the production of hollow objects, such as bottles, having biaxial molecular orientation. Biaxial orientation provides enhanced physical properties, clarity, and gas barrier properties, which are all important in products such as bottles for carbonated beverages.
There are two distinct stretch blow molding techniques. In the one-stage process, preforms are injection molded, conditioned to the proper temperature, and blown into containers-all in one continuous process. This technique is most effective in specialty applications, such as wide-mouthed jars, where very high production rates are not a requirement.
In the two-stage process, preforms are injection molded, stored for a short period of time (typically 1 to 4 days), and blown into containers using a reheat-blow (RHB) machine. Because of the relatively high cost of molding and RHB equipment, this is the best technique for producing high volume items such as carbonated beverage bottles.
Injection Blow Molding
In the injection blow molding process, the material is injection molded. The hot material, still on the core pin, is then indexed to the blow molding station where it is blown into a bottle and allowed to cool. For processing PET it is critical that this core pin be cooled. The bottle is then indexed to the next station and ejected. Injection blow molding allows more precise detail in the neck and finish (threaded) area than extrusion blow molding. Little, if any, improvement in physical properties is realized in the injection blow molding process since very little orientation occurs. Further, the injection blow molding process is normally limited to the production of relatively small bottles, i.e., 180 mL (6 fluid oz) or less. Eastapak polymer 9921 has been successfully used in the injection stretch blow molded process.
Extrusion Blow Molding
The extrusion blow molding process begins with the conventional extrusion of a parison or tube, using a die similar to that used for making plastic pipe.
The parison is commonly extruded downward between the two halves of an open blow mold. When the parison reaches the proper length, the mold closes, catching and holding the neck end open and pinching the bottom end closed. A rod-like blow pin is inserted into the neck end of the hot parison to simultaneously form the threaded opening and to inflate the parison inside the mold cavity. After the bottle cools, the mold opens to eject the bottle. The excess plastic is trimmed from the neck and bottom pinch-off areas.
Extrusion blow molding:
Can be used to process many different plastics, including HDPE, PVC, PC, PP, and PETG.
Requires relatively small capital investment in equipment;
Is suitable for small production runs.
Eastman products sold into the extrusion blow molding market are Eastar copolyester GN046, Eastar copolyester 6763, Eastar copolyester GN077 and Eastar copolyester GN071.

[@rhecoy2007]

Air blowing after heating is the final operation thus forming the bottle. So the same process in the fabrication of big pvc water tank. Thanks for sharing and adding some knowledge to myself.

[@benstorey8085]

Life changing 👍🏼

[@yourmomisbutt]

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[@gh-printingchina7791]

Hi! This is Vanessa from GH Printing. We are specializing in label printing for container including In Mould Label (IML), Pressure Sensitive Label, Shrink Sleeve Label etc. Nice to meet you.

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[@pault4215]

Hi what 3d application is used here? thanks!

[@jesusortigoza9852]

How we should use low presure and high presure parameters?

[@jinjun-blowmoldingmachiner1835]

There is also another blow molding not for PET.

[@mohamadalinagafdari7384]

Good

[@doannhatkhoa350]

What is the name of HDPE grade that you use?

[@blahbleh5671]

Injection blow moulding to be specific.

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[@rock3tgr33n2]

what about heating

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Blow molding 😍

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[@allen-7335]

whats the largest this can be scaled to? i want to blow mold a 20ft x 20ft bottle

[@justinsiebel9705]

it depends on the thickness of the initial preform as well as amount of pressure and heat you can introduce. You may want to consider a vacu-forming process.

[@allen-7335]

justin siebel thanks for the response. so in theory you could construct a 50ftx50ftx50ft water bottle ? how difficult would it be ?
why don't people build homes with this technology ? imagine using this machine to form a big water bottle, then bury it for better insulation. you would have a very cheap home. why is this not a thing ?

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