PET an inert material that is widely accepted by health authorities as a safe plastic which is one of the reasons it is so commonly used in food and beverage packaging. Similar to glass it is hygienic and generally resistant to attack by bacteria and other microorganisms. It will not biologically degrade even when in direct contact with food and beverages.
Special variants of take-home plastic containers made of PET are also available and commonly used for microwaveable food and it is cleared by the FDA for both single and repeated use.
Polyethylene terephthalate is a great material overall. It has a unique blend of qualities that make it extremely useful for consumer products and textiles in particular.
Topics: Plastics. Our expertise and unique collaborative process alleviates your stress and helps take your Design, Engineering and Prototyping process to the next level. Home About Contact Blog. Email: info creativemechanisms. Call Now: Shatterproof: PET will not break or fracture. This makes it a great replacement for glass as a container. That said, if high transmissivity is desired then plastics like Acrylic or Polycarbonate may be better choices.
Injection Molding : Polyethylene terephthalate is easily injection molded and is typically available for this purpose in the form of pellets. Other: In addition to the conventional plastic applications, Polyethylene terephthalate lends itself extremely well to fiber applications. Is PET Toxic? What are the Advantages of Polyethylene terephthalate? Polyethylene terephthalate is readily available and relatively inexpensive. Polyethylene terephthalate has high strength to weight ratio.
Polyethylene terephthalate PET is very resistant to moisture. The particle formation steps simultaneously form and crystallise the low molecular weight intermediate pellets. The approach used eliminates the finisher in the conventional melt process and one crystallisation stage in the SSP step. Costs are saved by eliminating steps, such as the hydrogenation in the PTA process and solid stating step, as well as in-process storage stages.
The process was commercialized in in a plant in South Carolina that was claimed to have three times the capacity in half the footprint of conventional PET technology.
It is the most recycled plastic in the United States and worldwide. PET can be recycled again and again — back into containers for foods, beverages and personal care products — or into carpet, clothing, automotive parts, construction materials, industrial strapping, and scores of other products. Although the feedstocks for PET are petroleum based, the environmental impact of PET is very favorable in comparison to glass, aluminum and other recyclable container materials.
That's because the light weight and strength of PET allows more product to be delivered with less packaging weight and less fuel than most other container materials. The basic building blocks of PET are ethylene glycol and terephthalic acid, which are combined to form pellets of PET.
These resin pellets are then heated to a molten liquid that can be easily extruded or molded into items of practically any shape. More specifically, when the two raw materials of PET are combined under high temperatures and low vacuum pressure, long chains of the polymer are formed. As the mixture becomes thicker, the chains grow longer. Once the appropriate chain length is achieved, the reaction is stopped. The resulting spaghetti-like strands of PET are then extruded, quickly cooled, and cut into small pellets.
When the resin pellets are reheated to a molten liquid stage, the polymer chains can be stretched in one direction for fibers or in two directions for bottles and films.
0コメント