Types of plastic
There are two types of plastic:
1. Thermoplastic plastic:
A thermoplastic, or thermo-softening plastic, is a plastic material, a polymer, that becomes pliable or moldable above a specific temperature and solidifies upon cooling.
Example:
— Polyethylene, polypropylene, polystyrene, and acrylics
2. Thermosetting plastic:
Thermoset, or thermosetting, plastics are synthetic materials that strengthen during being heated but cannot be successfully remolded or reheated after their initial heat-forming.
Example:
polyurethane, unsaturated polyesters, phenolics, and silicones
The woven bag is a more common packaging material in life, made of polypropylene material production and processing.
The polypropylene raw material is melted at high temperature, drawn and cooled to obtain a reel of a spool, and then woven by a large circular machine to obtain a cloth roll of different fabric widths, and then printed and sewed according to the customized requirements of different customers to obtain the final Of packaging bags put on the market.
The raw materials of polypropylene woven bags are divided into virgin materials and recycled materials.
What is the difference between “virgin” and “recycled” plastics?
Society today has an immense focus on sustainability and renewable resources making it hard to understand why any products are made from virgin material.
Virgin, of course, is the resin produced directly from the petrochemical feedstock, such as natural gas or crude oil, which has never been used or processed before. Recycled can mean many different things, however.
Post-consumer is exactly what it sounds like – material that has been reclaimed after it has left the hands of the consumer. For example, a plastic milk carton that is recycled is taken to a facility where it is washed, re-grounded, and pelletized into new post-consumer material.
Post-Industrial, in contrast, is recycled plastic that never left the manufacturing floor (and therefore never made it to the consumer). For efficiency and to keep costs low, manufacturers try to achieve zero waste during the production process. So they will recycle short shots, extra material, scrap pieces, or anything that isn’t yet appropriate to go to the consumer.
Bags made of virgin polypropylene, people say they are of high quality, and with the features like tough and durable yet lightweight enough. The color is in high brightness and the surface is smooth and even effect.
For the ones from a yarn made from recycled plastics, bags generally refer to gray and dark-colored woven bags, or color brightness becomes pale. Through multiple recycling, the bag is slightly heavier, but its strength is poor. And in a dark or gray-like shade.
What are recycled plastics used for?
Plastic recycling includes taking any type of plastic, sorting it into different polymers, and then chipping it, and then melting it down into pellets. After this stage, it can then be used to make items of any sort such as plastic chairs and tables. Soft Plastics are also recycled such as polyethylene film and bags. This closed-loop operation has taken place since the 1970s and has made the production of some plastic products among the most efficient operations today.
Let us tell you that there are various types of plastics due to which the use of recycled plastic depends on the type of plastic. When the plastics get recycled then it creates a different product and the quality of the recycled plastic is less than that of the original plastic. Thus let us tell you some types of plastics and their uses after recycled. Have a look at some of them which are listed below:
PET plastics: These types of plastics are mostly bottles, food containers, and packaging material which gets recycled and combined with virgin PET to keep the quality high enough.
PVC plastics: These types of plastics are difficult to recycle but in recent years more companies started doing it. but most of the time, PVC plastics get recycled into flooring, but also pipes, window profiles, traffic cones, and hoses.
LDPE plastics: These types of plastics can be recycled into trash cans, plastic film, garbage can liners, and plastic lumber.
PP plastics: These types of plastics are not often recycled, but are sometimes used for car parts, plastic trays, and storage bins.
When different types of plastics are melted together, they tend to phase-separate, like oil and water, and set in these layers. The phase boundaries cause structural weakness in the resulting material, meaning that polymer blends are useful in only limited applications. The two most widely manufactured plastics, polypropylene, and polyethylene behave this way, which limits their utility for recycling.
Woven bags subdivided from PP plastics are used to package grain, food, or animal feed, high-end chemicals, and additives, and have higher requirements on whether the raw materials of the packaging bags are brand-new materials, which also makes PP woven bags While the weaving industry is constantly evolving, improving, and reaching a new level, it also makes corresponding contributions to the global carbon footprint reduction.
Post time: Aug-24-2023