The difference between PE, PO, PP, PVC, OPP, CPE and ...

PE plastic bag is a polymer organic compound made by addition polymerization of ethylene. Polyethylene is recognized as the best food contact material in the world. Non-toxic, odorless, and odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, has the properties of moisture resistance, oxygen resistance, acid resistance, alkali resistance, general air tightness, excellent heat sealability and so on. It is one of the most widely used plastic bags and the most widely used plastic bags. The bag body is soft, but the transparency is not high enough for other materials, and it is relatively Mongolian. Good pull! Not easy to burst!

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PO plastic bag is blow molded from high-density polyethylene (HDPE), non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature can reach -70 ～ -100 ℃), good chemical stability, can withstand large Corrosion of most acids and alkalis (not resistant to acids with oxidizing properties), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects) and heat Poor aging. The properties of high-density polyethylene vary from species to species, depending on the molecular structure and density. Different production methods can be used to obtain products with different densities (0.91 ～ 0.96g / cm3). Polyethylene can be processed using general thermoplastic molding methods (see Plastic Processing). The body of the bag is brittle, the transparency is not high enough, it is even thicker than the PE material, it is a little white, and the pulling force is not very good.

PP plastic bag, commonly known as: 100% off plastic. Polypropylene is a representative of poly-α-olefin, a thermoplastic resin prepared by polymerization of propylene, and its monomer is propylene CH2 = CH-CH3. According to different initiators and polymerization processes, polypropylene can be divided into three configurations: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. Isotactic polypropylene is easy to form a crystalline state, with a crystallinity of more than 95% and a molecular weight between 80,000 and 150,000, giving him good heat resistance and solvent resistance; random polypropylene is an amorphous, White waxy material with slight stickiness, low molecular weight, 3000-10000, irregular structure, lack of cohesion, less application The bag body is hard, but the transparency is relatively high, clear, the pull is not very good! Explosive!

PVC plastic bag, polyvinyl chloride, plus ingredients to enhance its heat resistance, toughness, ductility, etc. The top layer of this surface film is paint, the main component in the middle is polyvinyl chloride, and the bottom layer is the back coating adhesive. It is a kind of synthetic material that is well-loved, popular and widely used in the world today. Among the materials that can produce three-dimensional surface films, PVC is the most suitable material. The bag body is soft or hard, and can be ordered according to the needs of the customers. The transparency can also be based on the needs. Because there are super transparent materials, ordinary materials and frosted materials, the pulling force is good, and it is not easy to rip or burst. Mouth, because the two layers of material are together with the machine beer.

OPP plastic bags have the best transparency, the highest transparency, and the most translucent appearance. They have the functions of dust prevention and enhancing the value of the packaged products. The products inside can be fully displayed in sales, so OPP plastic bag products are usually used as outer packaging for commodity sales, which not only protects but also beautifies. Widely used in jewelry, jade, stationery, toys, tableware, kitchen utensils, clothing and other fields. The bag is the most brittle, with the highest transparency and insufficient tension, but it is the most explosive. And the printing is the easiest to discolor.

CPE plastic bags are the most commonly used plastic bags for electronic products, such as Ipad tablets, Iphone mobile phones, PSP handheld game consoles, etc. These plastic bags are matte and smooth on both sides. It can also provide more high-end and more luxurious packaging bags.

When it comes to choosing plastics bags, two options are often considered: polyethylene (PE) or polypropylene (PP) plastic. Although polyethylene and polypropylene bags are both plastics, they aren't typically used for the same purpose or products. Deciding which type of plastic packaging to use depends on your specific needs and application.  

Choosing the Best Plastic Bag Type

Polyethylene bags: Polyethylene bags are translucent or opaque with a slight haze to them that allows you to see the items inside, although the details of the contents won't be clear. Polyethylene bags are ideal for packaging goods or items that require a high level of protection. Most industrial companies use polyethylene bags for packing and storing large, heavy items such as industrial machining parts. The main characteristics of polyethylene bags include:

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• Translucent or opaque

• Tear resistant

• Flexible

• Durable

• Low abrasion

• Soft and pliable

Polypropylene bags: Polypropylene bags are crystal clear, making them ideal for food, the medical industry, or any other industry where consumers need to clearly see a product before making a purchase. The main characteristics of polypropylene bags include:

• Durability

• Corrosion resistant

• Crystal clear transparency

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  Pliable at higher temperatures

• Stiff and hard plastic

• High environmental resistance

Before deciding which is the best plastic bag to use, consider your specific business needs, your budget, and how you want to package and present your products to your customers.

Polyethylene (PE) Bags

Polyethylene has several advantages, including exceptionally high melting and freezing points. It is created by the polymerization of ethylene (or ethene) monomers. Polyethylene is made by the addition or the radical polymerization of ethylene (olefin) monomers. Some of the properties and benefits of polyethylene bags include:

• Inert and translucent, which creates a lower static charge

• Preventing too much light from entering the bag, which protects the contents

• Attracting less dust, dirt, and other undesirable foreign organic elements

• Less costly than polypropylene

• More resistant to cold temperatures and wear and tear

Common types of polyethylene bags include:

• High-density polyethylene (HDPE): 

  Features densely packed and bonded molecules, making this type of polyethylene rigid, robust, and durable.

• Low-density polyethylene (LDPE)

  : LDPE is generated from free radical polymerization, resulting in long and short branching of chains. This type of polyethylene is flexible, with low tensile strength and durability.

• Linear low-density polyethylene (LLDPE):

   LLDPE is very strong and durable. It boasts a higher tensile strength and durability than the LDPE.

Typical Applications of Polyethylene Bags

Polyethylene bags are used in a variety of domestic and industrial applications, including making pipes, bottles, cans, tubing, plastic film wraps, polythene grocery bags, and much more.

Polypropylene (PP) Bags

Characterized by a more transparent appearance and higher tensile strength, polypropylene bags offer a higher heat and chemical resistance than polyethylene bags. Polypropylene packaging can be made with rigid protective edges, making it ideal for wrapping solutions that prevent scratches to the product or contents. It also offers unmatched protection against moisture, vapors, and debris. Some of the specific properties and benefits of polypropylene bags include:

• More resistance to chemicals, high temperatures, and scratches

• Stiff and hard plastic

• Crystal clear for excellent product presentation

• Unmatched vapor and moisture barrier

• Meeting FDA and USDA specifications and requirements

Typical Applications of Polypropylene Bags

Polypropylene bags are commonly used for food wrapping, electronics manufacturing, and hospitals to keep contents free of contaminants. They are also used for packaging a vast number of consumer products in a wide range of industries and applications, including the automotive industry.

Packaging Solutions by Universal Plastic

Polyethylene and polypropylene poly bags are undeniably the two most commonly utilized packaging solutions. When deciding the best option for your needs, it is crucial to know the advantages that each offer. If you need help choosing the right one, reach out to Universal Plastic today. Our experts will work closely with you to understand your application requirements. Later, we can customize these bags with your brand logo and text for branding and promotional purposes and offer them in the best wholesale prices. Contact us today to discuss your requirements and request a quote.

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