A Comprehensive Guide to PE Bags: Flat Bags, Ziplock Bags, Gusseted Bags, and Zipper Bags
In the packaging industry, PE bags play a crucial role with their diverse types, excellent performance, and wide applicability. PE, short for polyethylene, is a thermoplastic resin made by polymerizing ethylene. Depending on its density, it can be divided into HDPE (high - density polyethylene) and LDPE (low - density polyethylene), which give PE bags different characteristics. Common types of PE bags include flat bags, ziplock bags, gusseted bags, and zipper bags. They differ in product features, regular thickness, and application scenarios.
As Hangzhou Hengyi Packaging Materials Co., Ltd., we specialize in producing these PE bags. Our products are sold to many countries around the world, and we also offer customization services to meet the specific needs of our customers.
1. PE Flat Bags
Product Differences
Flat bags are the most basic and simple type of PE bags. They are made by blowing film with a machine, then cut into individual bags and sealed at the bottom. The bag mouth is flat, and there is usually no additional sealing design. This kind of bag has a simple structure, a direct production process, and relatively low cost. In terms of appearance, it is generally transparent, which can clearly show the contents inside. Its material mostly uses LDPE, which is relatively soft and has a certain degree of flexibility.
Regular Thickness
The thickness range of flat bags is relatively wide, commonly ranging from 0.02mm to 0.1mm on one side. For example, flat bags used to pack light and small items such as jewelry and small stationery may have a thickness of 0.02mm to 0.04mm on one side, which is lightweight and low in cost. When used to pack slightly heavier items or those with certain strength requirements, such as small clothes and larger parts, the thickness will be 0.05mm to 0.1mm on one side to ensure that the bag has sufficient strength and is not easy to break.
Application Scenarios
Due to their lightweight, low cost, and transparent visibility, flat bags are widely used in the packaging of various small commodities. In the clothing industry, they are often used to pack single pairs of socks, gloves, and other small clothing accessories. In the food field, they can pack some small snacks, such as a few candies and a small bag of nuts. In stationery stores, they can be used to pack single pencils, erasers, and other stationery. In addition, in farmers' markets, some merchants will use flat bags to pack small amounts of seasonings, side dishes, etc. for customers.
2. Ziplock Bags
Product Differences
Ziplock bags have a sealing strip at the bag mouth. They can be sealed by pressing the sealing strip without the need for additional tools and can be opened and closed multiple times. The biggest difference between them and flat bags is this special sealing design. In terms of material, ziplock bags are mostly made of polyethylene (LDPE) and linear low - density polyethylene (LLDPE) through blow molding. Common ones include zippered ziplock bags (also known as bone - attached bags, airtight bags, etc.). The sealing strip at the bag mouth has a concave - convex groove structure, which is fitted with each other to achieve sealing. Ziplock bags usually have few printed patterns and colors to avoid affecting the sealing effect of the sealing strip.
Regular Thickness
The regular thickness of ziplock bags is generally 0.03mm to 0.2mm on one side. Ziplock bags used to pack small items such as jewelry and electronic components may have a thickness of 0.03mm to 0.05mm on one side. For food packaging, such as food - grade ziplock bags for storing small foods and tea, the thickness is mostly 0.06mm to 0.1mm on one side to ensure sealing and durability. Some large ziplock bags that need to hold heavier items or have higher protection requirements can have a thickness of up to 0.2mm on one side.
Application Scenarios
The good sealing performance of ziplock bags makes them play a role in many fields. In the food industry, they can store various small foods, tea, seafood, etc., effectively preventing moisture, odor, and insects, and keeping food fresh. In the cosmetics field, they can be used to pack samples for easy carrying and use. In the electronics industry, anti - static ziplock bags are often used to pack electronic components to prevent static electricity from damaging the components. In daily life, they can also be used to store small items such as buttons and pins, facilitating sorting and searching.
3. Gusseted Bags
Product Differences
Gusseted bags, also known as folded - corner bags, accordion bags, or side - gusseted bags, are unique in that they have foldable sides on both sides. When unfolded, they look like organ pleats. This design allows the bag to be folded to save space when not in use, and can provide a larger loading capacity when in use. Compared with ordinary bags, it can better adapt to the packaging of irregularly shaped items. Gusseted bags are generally made of PE film, and the production process is relatively more complex, requiring special folding treatment during the bag - making process. Its material can use PE of different densities according to different application scenarios. For example, HDPE can provide better strength and is suitable for packing heavier items.
Regular Thickness
The thickness of gusseted bags is usually 0.05mm to 0.2mm on one side. If used to pack textiles, light daily necessities, etc., the thickness may be 0.05mm to 0.1mm on one side. When used to pack heavier items such as building materials and chemical raw materials, the thickness will be increased to 0.15mm to 0.2mm on one side to ensure the load - bearing and tear - resistance of the bag.
Application Scenarios
Gusseted bags have significant advantages in packaging irregular goods. In the textile industry, they are often used to pack rolled fabrics, clothes, etc. In the industrial field, they can be used as liners in cartons to protect the items inside from collision, and also for pallet packaging, facilitating handling and storage. In some gift packaging, the unique shape of gusseted bags can increase the beauty and three - dimensional sense of the packaging and enhance the product image.
4. Zipper Bags
Product Differences
Zipper bags are equipped with zippers and zipper caps at the bag mouth. They can be sealed and opened by pulling the zipper, with good sealing effect and convenient operation. Compared with ziplock bags, the sealing of zipper bags is more firm, making them more suitable for long - term storage of items. Their material is mostly PE, and some high - end zipper bags also use multi - layer composite materials to enhance the performance of the bags, such as improving barrier properties and strength. Zipper bags can be printed with more complex patterns and text, playing a good role in publicity and display while packaging.
Regular Thickness
The thickness of zipper bags is generally 0.06mm to 0.2mm on one side. Small zipper bags used to pack cosmetic samples, medicines, etc. may have a thickness of 0.06mm to 0.1mm on one side. Large zipper bags used to pack clothes, bedding, etc. have a thickness of mostly 0.12mm to 0.2mm on one side.
Application Scenarios
In the food industry, zipper bags are often used to pack snacks such as potato chips and biscuits, which can effectively prevent moisture and maintain the taste. In the cosmetics industry, they can pack products such as lotions and creams, which are convenient to use and carry. In daily life, they are used to store clothes and bedding, which can prevent dust and moisture and facilitate taking. In the office supplies field, they can be used to store documents, bills, etc. to prevent data from scattering and getting damp and damaged.
Different types of PE bags have their own characteristics in product differences, regular thickness, and application scenarios. When choosing to use them, it is necessary to comprehensively consider various factors such as the characteristics, weight, storage requirements of the packaged items, and cost budget, so as to select the most suitable PE bag packaging scheme. And we, Hangzhou Hengyi Packaging Materials Co., Ltd., can provide you with high - quality products and customized services to meet your various needs.
