Virtually all single-serving and 2-liter bottles of carbonated soft drinks and water sold in the U. It is also popular for packaging salad dressings, peanut butter, cooking oils, mouthwash, shampoo, liquid hand soap, window cleaner, even tennis balls. Special grades of PET are used for carry-home food containers and prepared food trays that can be warmed in the oven or microwave.
The basic building blocks of PET are ethylene glycol and terephthalic acid, which are combined to form a polymer chain. The resulting spaghetti-like strands of PET are extruded, quickly cooled, and cut into small pellets. The resin pellets are then heated to a molten liquid that can be easily extruded or molded into items of practically any shape.
In the late s, researchers found a way to stretch a thin extruded sheet of PET in two directions to create PET film, which is now used extensively for video, photo and packaging films.
In the early s, the technology was developed for blow-stretch molding PET into bottles. The PET bottle was patented in Polyester Fabric. In the case of PET, the hydrocarbon ethylene glycol is combined with terephthalic acid to produce the material. Pellets of PET resin are heated to a molten liquid, which can be easily extruded or molded into almost any shape.
Polyethylene terephthalate is a wonderful plastic for 3D printing. It is a strong and flexible with a high success rate for 3D printed prototypes. It is best for objects that need to combine flexibility and toughness such as mechanical parts or cases for electronic equipment. Polyethylene terephthalate is widely available as sheet stock for CNC machine manufacturing.
Polyethylene terephthalate is easily injection molded and is typically available for this purpose in the form of pellets. Because PET is hygroscopic it must be dried before it can be used in a molding machine. In addition to the conventional plastic applications, Polyethylene terephthalate lends itself extremely well to fiber applications.
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: Antimony trioxide is classified as possibly carcinogenic , and some forms are potentially endocrine disrupting. Researchers have found antimony at detectable levels in polyester textiles.
Even at low temperatures, antimony can migrate from polyester to saliva and sweat. One study concluded that exposure to antimony through polyester could result in potential health impacts for groups who wear polyester often and for prolonged period of times. Keep in mind that polyester is often used in active apparel and worn at times when the wearer is sweating. This research also raises some unanswered questions about our exposure to antimony through polyester bedding while we sleep.
Given that we spend about a third of our lives in bed, is it possible that this is prolonged and frequent enough exposure to experience associated health impacts from antimony? No research is available on this subject, so more study is needed. A number of researchers have also confirmed that other estrogenic compounds are capable of migrating from PET water bottles into its contents. Plastics like PET can break down into tiny pieces called microplastics , which are pervasive in our oceans — as well as our bays , lakes , and even drinking water.
Plastics break down into tiny pieces, but they essentially never go away , as petroleum-derived plastic is typically not biodegradable. Microplastics are often consumed by aquatic life , both large and small.
0コメント