Blowing plastic process technology is widely used. I hope this article can give some inspiration to friends who want to understand this knowledge.——-Vito.
Extrusion blowing and injection blowing plastic bottle development points of attention and differences!
Difference 1, the difference between the production of raw materials.
Extruded plastic bottles commonly used plastic raw materials are: HDPE LDPE PP PVC PETG
Injection pull plastic bottles commonly used plastic raw materials: PET PP HDPE PMMA
Difference 2, the process difference.
Extruded plastic bottles without embryo
Injection blowing plastic bottles need to be injected before blow molding
Difference 3, the difference in production.
Extruded bottles need to be mechanically or manually pinched to remove the excess gluing, and some need to polish and trim the bottle mouth.
Injection blowing process bottles can be boxed directly after the mold or other processes in the next step, without secondary processing.
Difference 4, bottle bottom appearance difference.
Extruded blow plastic bottles, the bottom of the bottle has a mold line pinch.
Injection blowing plastic bottles have no mold line at the bottom of the bottle.
Difference 5, the mold difference.
Extruded plastic bottles need: two pairs of blowing molds, of course, sometimes can do a pair, depending on production needs.
Injection blowing plastic bottles need: one pair of injection molds for bottle embryos (in most cases of two-step method, manufacturers directly buy bottle embryos from embryo suppliers) and one pair of blowing molds.
Difference 6, the selected material application market: 1.
1. extrusion blowing plastic bottle material in the plastic bottle industry product applications.
HDPE (low-pressure high-density polyethylenes): general packaging bottles such as: shampoo bottles, shower gel bottles, laundry detergent bottles
LDPE (high-pressure low-density polyethylene): eye drops bottles, cigarette oil bottles, hose bottles, seasoning bottles and other products that need to be extruded
PP (polypropylene): food, pharmaceutical plastic bottles, more or more to inject, pull and blow one-step and injection molding process is the main
PETG: cosmetic packaging bottles
2. Injection blowing plastic bottle material in the plastic bottle industry product applications.
PET (a kind of polyester): beverage bottles, cosmetic bottles, water bottles, bottles for daily necessities, bottles for health products, etc.
PP: food bottles, milk bottles, medical bottles Note: used as food grade mostly for one-step process
HDPE: pharmaceutical bottles Note: Same as PP, mostly one-step process production
PMMA (commonly known as acrylic): Mostly used in cosmetic packaging bottles, more or injection molding process
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