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Gusseted Poly Bag

Gusseted poly bag used in laboratory

What is gusseted poly bag?

Gusseted poly bag is also commonly known as gusset plastic bag. This kind of gusseted clear bag is used in many industries. They are often used in the textile and apparel industry to protect products from dust, dirt, and moisture. Gusset polyethylene bags are also used well in laboratories to protect against dust and moisture.

There are many types of polyethylene plastic bags according to their different functions. The most common ones are flat polyethylene plastic bags, triangular polyethylene plastic bags, and gusseted polypropylene bags. After the product is packed into gusseted polyethylene bags, the gusseted plastic bags can be sealed by heating or compaction.

These types of plastic bags need to be designed specifically for the thickness, length, or width of the product. Polyethylene plastic bags can be found everywhere, they are durable and long-lasting and can be recycled as an environmentally friendly product.

What is polyethylene plastic?

Polyethylene is abbreviated as PE. Polyethylene substance is one of the five major synthetic resins in the world. Polyethylene materials are divided into three main categories: linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and high-density polyethylene (HDPE).

A. Material properties

a. Excellent corrosion resistance, and electrical insulation (especially high-frequency insulation).

b. Chlorinated, irradiation modified.

c. Melting point of low-pressure polyethylene can be reinforced with glass fiber. High stiffness, hardness and strength, low water absorption, good electrical properties, and radiation resistance.

d. High-pressure polyethylene has better flexibility, elongation, impact strength, and permeability.

e. UHMWPE has high impact strength, fatigue resistance, and wear resistance.

f. Low-pressure polyethylene is suitable for making corrosion-resistant parts and insulating parts; high-pressure polyethylene is suitable for making films, etc.; UHMW polyethylene is suitable for making shock absorbing, wear-resistant, and transmission parts.

B. Forming performance

a. Crystalline material, low moisture absorption. Does not require sufficient drying.

b. Excellent flowability. Mobility is sensitive to pressure, so high-pressure injection is recommended for molding, uniform material temperature, fast filling speed, and adequate pressure retention.

c. It is not suitable to use direct gating to prevent uneven shrinkage and increase internal stress. Pay attention to the choice of gate location to prevent shrinkage and deformation.

d. Large shrinkage range and value. The directionality is obvious, easy to deformation and warping. The cooling speed should be slow. The mold is equipped with a cold cavity and cooling system.

e. Heating time should not be too long, otherwise decomposition and burns will occur.

f. If the soft plastic parts have shallow side grooves, they can be forced to demold.

g. Melt rupture may occur. Contact with organic solvents is not recommended to prevent cracking. The products are high-pressure low-density polyethylene (LDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE). The film is its main processed product, followed by sheet and coating, bottles, cans, barrels, and other hollow containers and other injection and blow molding products, pipes and insulation, and sheathing for wires and cables. It is mainly used in the packaging, agriculture, and transportation sectors.

Application of polyethylene plastic

A. Transparent materials for daily use

Transparent plastics for daily use require better transparency, a low price, and an easy molding process.

a. Transparent film category PE, PP, PS, PVC, and PET for packaging Agricultural PE, EVA, PVC, and PET, etc.
b. Transparent sheet and plate PP, PVC, PET, PMMA, and PC, etc.
c. Transparent tube with PVC, PA, etc.
d. Transparent bottles with PVC, PET, PP, PS, and PC, etc.

B. Lighting materials

Lighting equipment mainly includes all kinds of lampshade-type products, used for light transmission. The specific performance requirements are high transmittance and good impact resistance. Commonly used plastics for lighting equipment are PS, modified PS, AS, PMMA, and PC, etc.

C. Optical instrument materials

Optical instruments mainly refer to all kinds of mirror materials, including glasses, lenses, magnifying glasses, and telescopes, etc. Specifically, they can be divided into two categories: rigid lenses and soft lenses (contact lenses). The traditional optical instruments used in products are glass, but plastic not only has comparable transparency with glass, but also has the advantages of being lightweight, and not easy to break. It is gradually replacing the glass material.

D. Glass-like materials

The performance requirements of transparent plastics for glass are high light transmission, high surface hardness, high impact strength, and easy secondary processing.

E. Solar energy materials

The performance requirements of transparent materials for solar energy are as follows.

a. High light transmittance, low haze.
b. Good weather resistance.
c. Transmission of near-infrared rays. Nearly half of solar energy is near-infrared, which can effectively use solar energy
d. Far infrared transmission rate is also required to be high, such as PE, FEP has a greater permeability.

Compared with glass, plastic can be all through the near-infrared, some plastics can also be through a larger far infrared, and the infrared transmission of glass is poor. Therefore, plastic is more suitable than glass rings: light energy and can be widely used for solar water heaters, greenhouses, and solar room cover materials. Transparent plastics that can be used for solar energy are PMMA, PC, GFUP, FEP, PVF, SI, etc.

F. Optical fiber materials

Transparent plastic materials use repeated refraction and reflection to enable the propagation of light in a tortuous manner. This feature is particularly suitable for optical fiber materials. The performance requirements for the material are good transparency, a high refractive index for the core layer, a low refractive index for the cladding layer, small birefringence and does not increase due to processing, and good lightfastness. Optical fibers are generally made of plastic. Microfiber material consists of two layers of transparent material. The core layer is a transparent plastic with a high refractive index, the material is PMMA or PC; the cladding layer is a transparent plastic with a low refractive index, and the material is fluorinated olefin polymer, fluorinated methyl methacrylate type.

G. Optical disc material

Optical plastic materials with good transparency suitable for optical disc adoption should have the following properties.

a. High transparency, its light transmission rate is not less than 90%
b. Good environmental adaptability and transparency does not change greatly due to the influence of temperature and humidity.
c. The noise generated during work and to be as small as possible.
d. Moisture absorption, permeability, and oxygen permeability should be small.
e. Long-term stability of the mechanical properties.
f. Easy to process.

The materials that can be applied to the disc are PC, lPMMA, new amorphous thermoplastic polyester ETG), amorphous cyclic olefin (mCOC), modified bisphenol A epoxy resin, and so on. Among them, the PC is the most commonly used. In recent years, the application ratio of mCOC has been gradually expanded due to its low water absorption and excellent optical properties.

H. Transparent encapsulation materials

Transparent encapsulation materials are mainly used for photoelectric conversion of electronic devices, such as solar cells. The performance requirements of the transparent plastic used are high light transmission, good wear resistance, high pollution resistance such as low dust adsorption, good weather resistance, etc. At the same time, it also has excellent sealing properties, which refer to air tightness, moisture resistance, and protection from other chemicals. It is also soft and elastic. Suitable for transparent packaging materials are mainly surface hardening of PMMA, FEP, EVA, EMA (ethylene/vinyl acetate copolymer), PVB (polyvinyl butyral), etc. And transparent packaging materials are generally not used PET, PC, PVC, PU, etc.

Type of gusseted poly bag

According to the gusseted poly bag material light transmission rate, the material can be divided into the following three categories.

a. Transparent materials, wavelength 400-800nm visible light transmission rate of 80% or more.

b. Translucent materials, wavelength 400-800nm visible light transmittance between 50% to 80%.

c. Opaque materials, wavelength 400-800nm visible light transmission rate of 50% or less.

Resin classification

a. Most of the transparent resins belong to the transparent category, mainly including PMMA, PC, PS, PET, PETG, transparent ABS, transparent PP, transparent PA, SAN (also known as AS), (also known as K resin), MS, MBS, PES, J.D series, CR-39, TPX, HEMA, F3, F4, PVF, PVDF, EP, EFP, PF, UP, cellulose acetate, nitrocellulose, and EVA. PF, UP, cellulose acetate, nitrocellulose, EVA, etc. Among them, PES is polyethersulfone, J.D series optical resins are copolymer derivatives of PES, SAN is styrene/acrylonitrile copolymer, TPX is polymethyl-1-pentene, BS is 25% butadiene/75% styrene copolymer, CR-39 is di-allyl diglycol carbonate polymer, and HEMA is poly (ee-based hydroxyethyl acrylate). Among these transparent plastics, the most commonly used are PC, PMMA, PS, PET, PETG, AS, BS, MS, MBS, transparent ABS, transparent PP, transparent PA, etc.

b. Translucent resins mainly include PP, PE, PA, PVB (polyvinyl butyral), etc.

c. There are few varieties of absolutely opaque plastics, such as PPO and POM.

How to buy gusseted poly bag?

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If you are interested in our gusseted poly bag or have any questions, please write an e-mail to [email protected], we will reply to you as soon as possible.

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