The basic knowledge and methods of common plastics

Plastic is a commonly used chemical raw material, and it is a high-molecular organic material that is formed by polymerizing one or more monomers under certain reaction conditions. Due to its characteristics of light weight, low cost, and excellent performance, it is in the national economy. Occupy an important part.

First, the conventional plastic varieties and classification

In daily life, we can directly touch or perceive plastics, most of which are conventional general-purpose plastics, mainly including five categories: PE, PP, ABS, PVC, and PS. These five types of plastic occupy the vast majority of plastic raw materials used. The rest can basically be classified as special plastic varieties, such as PPS, PPO, PA, PC, POM, etc., and they are used in a small amount in daily life products. They are mainly used in high-end fields such as engineering industry and national defense science and technology. Automotive, aerospace, construction, communications and other fields. Plastics are classified according to their plasticity and can be divided into thermoplastics and thermosetting plastics. Under normal circumstances, thermoplastic products can be recycled, but thermosetting plastics can not, according to the optical properties of plastic, can be divided into transparent, translucent and opaque materials, such as PS, PMMA, AS, PC, etc. are transparent plastic Most other plastics are opaque plastics. There are many ways to classify plastics, which are not introduced here.

Second, the performance and use of commonly used plastic varieties

1. Polyethylene: Commonly used polyethylene can be divided into low pressure polyethylene (HDPE), high pressure polyethylene (LDPE) and linear high pressure polyethylene (LLDPE). Among them, HDPE has better thermal performance, electrical properties and mechanical properties, while LDPE and LLDPE have better flexibility, impact properties, and film forming properties. LDPE and LLDPE are mainly used for packaging films, agricultural films, and plastics modification, while HDPE is widely used in various fields such as films, tubes, and daily necessities for injection.

2. Polypropylene: Relatively speaking, polypropylene is more variety and its use is also more complicated. There are many fields. The main varieties are homo polypropylene (homopp), block copolymer polypropylene (copp) and random copolymer polypropylene ( Rapp), according to the different uses, homopolymerization is mainly used in the drawing, fiber, injection, BOPP film and other fields, copolymer polypropylene is mainly used in household appliances injection, modified raw materials, daily injection products, pipe materials, etc. Propylene is mainly used for transparent products, high-performance products, high-performance pipes and so on.

3, PVC: Because of its low cost, the product has the characteristics of self-inflammability, it is widely used in the construction field, especially the sewer pipe, plastic steel doors and windows, panels, artificial leather and other uses the most widely.

4, Polystyrene: As a transparent raw material, in the case of transparent demand, the use of a wide range of uses, such as automotive lampshades, daily transparent parts, transparent cups, cans and so on.

5, ABS: is a widely used engineering plastics, with outstanding physical and thermal properties, widely used in household appliances, panels, masks, assemblies, accessories, etc., especially household appliances, such as washing machines, air conditioners, refrigerators, Fans, etc., are used in very large quantities. In addition, the use of plastics is also very versatile.

Third, the identification of commonly used plastics

1. Density method: Examine the density of various plastics, and use liquid as medium to test the ups and downs of plastics in liquid medium to roughly identify the major categories of plastics. For example, if a piece of plastic is placed in water, it can be concluded that the raw material is not PVC (due to PVC density>1).

2. Combustion method: mainly examines the color of the flame and the odor and smoke emitted when it is burned. In general, the burning flames of polyolefins are mostly blue or light blue, the odor is relatively mild and pale, and the smoke is white. Most raw materials with benzene or chlorine are prone to black smoke after burning, and the smell is intense. In addition, such as PE, PP drip phenomenon, and PVC, no drip, but there are self-extinguishing phenomenon.

3, optical method: mainly examine the transparency of raw materials, commonly used transparent materials: PS, PC, PMMA, AS; translucent materials: PE, random copolymer PP, homopolymer PP, soft PVC, transparent ABS, etc. The other raw materials are essentially opaque.

4, color discrimination method: In general, raw materials without additives, if it contains double bonds, the color will appear slightly yellow, such as ABS, due to butadiene copolymer, polymer still contains double bonds, So it will look yellow.

Most other methods of identification require the use of various instruments such as infrared spectroscopy, mass spectroscopy, nuclear magnetic resonance, differential scanning, thermal analysis, and the like.

Lace can make women more feminine, but if lace is not selected correctly, it is easy to give people a cheap feeling. However, water-soluble Polyester Lace is completely different.


The difference between Water soluble lace fabric and ordinary lace fabric is as following:

Water-soluble lace is a big category in embroidery lace. The production process is both time-consuming and time-consuming, and in the final presentation of the effect, there will be a relief-like exquisite and luxurious sense of art, so water-soluble lace fabric is a very high-end on the market. Hollow lace.


What is the process of embroidery for water-soluble lace fabrics ?

Water-soluble embroidery ( water-soluble lace) is a major category of embroidery laces. It uses a water-soluble nonwoven as the base fabric, viscose filaments as the embroidery thread, and is embroidered on the base fabric by a computer flat embroidery machine, and then heated. The water treatment dissolves the water-soluble nonwoven fabric leaving a three-dimensional lace. Embroidery is the general name for various decorative patterns embroidered on fabrics by needles. It is the decorative fabrics that use needles to puncture silk or other fibers and yarns in certain patterns and colors on the embroidered material to form patterns. It is an art that uses needles and threads to add human design and fabrication to any existing fabric. Embroidery lace has a large variety of flowers, exquisite and beautiful embroidery, uniform and uniform, vivid image, full of artistic sense and three-dimensional feeling.

The biggest difference between the water-soluble lace and the ordinary lace is that it is not as good as the ordinary plate-making. It has to go through a [boil" process after it is completed on the machine. This process is to make a water-soluble version. Needle processing needs to be different from ordinary platemaking.


Water-soluble lace is a very high-end hollow lace on the market, its noble is reflected in the production process and visual effects. The craftsmanship is time-consuming and time-consuming. Each of its hooked flowers is woven and densely densified, creating an ancient Greek relief-like exquisite art, elegant and refined, and elegant. The undulating three-dimensional texture is the most intuitive feature that distinguishes water-soluble lace fabric from chemical fiber lace. It is more retro and more atmospheric. The full-empty flower pattern on the dress is also delicate so that you can't help.


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