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What Is A Ziplock Bag?

- May 18, 2017 -


Ziplock bags, also named LDPE zipper bags, minigrip bags, minigrip zipper bags, reclosable plastic bags, resealable zipper bags, self seal plastic bags, are low density polyethene (LDPE) bags with a zip closure.

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Raw Material

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Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization. Its manufacture employs the same method today. The EPA estimates 5.7% of LDPE (recycling number 4) is recycled. Despite competition from more modern polymers, LDPE continues to be an important plastic grade.

LDPE is defined by a density range of 0.9100.940 g/cm3. It is not reactive at room temperatures, except by strong oxidizing agents, and some solvents cause swelling. It can withstand temperatures of 80 °C continuously and 95 °C for a short time. Made in translucent or opaque variations, it is quite flexible and tough.

LDPE has more branching (on about 2% of the carbon atoms) than HDPE, so its intermolecular forces (instantaneous-dipole induced-dipole attraction) are weaker, its tensile strength is lower, and its resilience is higher. Also, because its molecules are less tightly packed and less crystalline due to the side branches, its density is lower.

The classic ziplock bag features a ‘slidergrip’ ziplock seal that runs along the top length of the bag. This features a clasp that slides along the bag seal and, depending on the direction of travel, either opens or closes the two sides of the bag together. This mechanism works much in the same way as a zip fastener, which gives the ziplock bag its name.

Here are just some of the industries from which companies regularly turn to the zipper or ziplock bag for impressing delegates at conferences:

·          Agriculture

·          Accounting

·          Advertising

·          Banking

·          Computer

·          Energy

·           Entertainment & Leisure

·           Financial Services

·           Legal

·           Manufacturing

·           Medical

·           Pharmaceutical

·          Publishing

·          Real Estate

·          Retail

·          Service

·          Technology

·          Telecommunications

Ziplock bags are perfect for easy identification of contents like of parts, medical supplies, janitorial supplies and foodstuffs. All of our reclosable bags are made from 100% virgin low-density polyethylene resin and meets FDA and USDA requirements. Used in the food industry, medical industry, parts industry and janitorial industry.

Product Specifications

Our ziplock bags can be customized as per customer’s special requirements, such as size, thickness, printing, packing, etc. We ensure our good quality and price make you gain located market share.

Here are the regular designs we produced for your reference.


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