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A finished PET drink bottle compared to the preform from which it is made. There are two basic molding methods for PET bottles, one-step and two-step. In two-step molding, two separate machines are used. The first machine injection molds the preform, which resembles a test tube, with the bottle-cap threads already molded into place.
In the two-stage injection stretch blow molding process, the plastic is first molded into a "preform" using the injection molding process. These preforms are produced with the necks of the bottles, including threads (the "finish") on one end. These preforms are packaged, and fed later (after cooling) into a reheat stretch blow molding machine.
Injection moulding (U.S. spelling: injection molding) is a manufacturing process for producing parts by injecting molten material into a mould, or mold. Injection moulding can be performed with a host of materials mainly including metals (for which the process is called die-casting ), glasses , elastomers , confections , and most commonly ...
The resin identification code for PET plastic products. Plastic bottles are marked at their base with the resin identification code to indicate the material used. [25] [self-published source?] Product labels are attached with adhesive or are shrunk to fit. In-mould labelling is a process of building the label into the bottle during molding.
Sidel covers the entire process chain for liquid filling. The portfolio includes complete line solutions [buzzword], including standalone equipment such as blow moulders, [16] fillers, [17] labellers and associated services. The aseptic filling lines comprise wet sterilisation technology and dry preform sterilisation using hydrogen peroxide. [18]
Polyethylene terephthalate (PET) is a common condensation polymer.. In polymer chemistry, condensation polymers are any kind of polymers whose process of polymerization involves a condensation reaction (i.e. a small molecule, such as water or methanol, is produced as a byproduct).
The preferred method for recycling this stream is mechanical recycle, a process in which the resin is remelted, filtered and extruded or molded into new PET articles, such as bottles, [2] films [13] strapping or fibers. [14] If the PET feedstock is not pure enough for mechanical recycle, then chemical recycling back to monomers or oligomers is ...
Multi-material injection molding (MMM) is the process of molding two or more different materials into one plastic part at one time. [1] As is the case in traditional injection molding, multi material injection molding uses materials that are at or near their melting point so that the semi-liquidous material can fill voids and cavities within a pre-machined mold, thus taking on the desired ...