Plastic Bags Manufacturing Process and Their Impacts on Environment

In the Plastic Bags Manufacturing Process, a plastic bag or pouch is a kind of packaging made from a thin or flexible plastic film, non-woven fabric, or plastic fabric.

Plastic bags are used to contain and transport goods such as foods, products, powders, ice, magazines, chemicals, and waste. Most of the plastic bags are heat-sealed together.

Plastic bags are made of “film,” or thin flexible plastic sheets. Most plastic bags are made of # 2 or # 4 polyethylene resin code # 4. Resin # 2 code is High-Density Polyethylene (HDPE). Resin code # 4 is either low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE).

Types of Plastic Bags in manufacturing

Other than size, shape, color, and other physical properties, plastic bags are available in various materials that offer their advantages and features.

 Types of Plastic Bags

  • (HDPE) stands for High-Density Polyethylene
  • (LLDPE) stands for Low-Density Polyethylene
  • (MDPE) stands for Medium Density Polyethylene
  • (PP) PP stands for Polypropylene

HDPE Types Of Plastic Carry Bags

HDPE Types Of Plastic Carry Bags in pakistan

HDPE stands for High-Density Polyethylene, which is the most common material used to make plastic shopping bags. The polymer material used in these bags is made of straight molecular chains that have a linear structure from start to finish, with very little branching. As a result of the dense molecular structure, HDPE plastic bags are somewhat opaque and lightweight but extremely sturdy.

LLDPE Types Of Plastic Bags

LLDPE Types Of Plastic Bags in pakistan

LDPE stands for Low-Density Polyethylene, which is a popular type of plastic used in food packaging as well as utility bags. The polymer material used in these plastic bags is made of low-density polyethylene chains and spread in different assembly lines or branches. As a result, LDPE plastic is very lightweight and has moderate tensile strength.

LLDPE stands for Linear Low-Density Polyethylene, which is commonly used in the production of plastic shopping bags as well as food bags, garbage bags, and newspaper bags. While it is also made of polymer materials with unbranched polyethylene chains, it does not have the same tensile strength as HDPE bags and needs to be manufactured into a heavier and thicker shape for shopping bags.

MDPE Types For Food Packaging Bags

MDPE Types For Food Packaging Bags in pakistan

MDPE stands for Medium Density Polyethylene, which is a mixture of High Density and Low-Density Polyethylene. MDPE is not as clear as LDPE, but it is not as opaque as HDPE either. This polymer is less dense than HDPE, so it is not as strong and not a good choice for bulk storage or transportation. However, it has a high degree of chemical resistance.

Due to its relatively low tensile strength and stretching properties, this material may not be ideal for manufacturing plastic shopping bags, but it can be used in the production of garbage bags, shrinkage films, and packaging films for certain consumer products, such as towel paper, toilet paper, etc.

PP Plastic Bag Material

PP Plastic Bag Material in pakistan

PP stands for Polypropylene, and it has very high chemical resistance and strength as well as a high melting point, making it ideal for liquid or hot food packaging applications. Compared to other plastic bags, polypropylene bags are less opaque and allow easy identification of their contents.

Polypropylene bags are very popular in retail operations as well, since they are food safe, not breathable, and have a longer shelf life than most other types of polyethylene bags. It is generally used to store online products such as ketchup, yogurt, syrups, desserts, baked goods, medicines, etc., which contain water, salt, or acids that may damage metals and other packaging materials.

We all use plastic bags to bring goods from the supermarket on a large scale or just to take out the garbage. Plastic bags have a very important role in our society and thus it also demands to be environmentally friendly and hence, the manufacture and proper disposal of plastic bags are important. We will explain to you the manufacturing process with every step.

What are plastic bags made of?

Plastic bags are made of polyethylene which is either low density or high-density polyethylene or sometimes, a combination of both.

Polyethylene is a component of petroleum products (crude oil and natural gas) and is separated through a process of fractional distillation. Petroleum is extracted from the earth by drilling deep and extracting crude oil which is then separated.

How are plastic bags made?

Whenever placing plastic bags, it is thought that how plastic bags are made. Therefore, I thought of writing a piece on the process of manufacturing plastic bags. My goal here is to tell you about the plastic bag manufacturing process in the simplest way possible.

Plastic bags are made through a process called “blow film extrusion”.

Best  5 Plastic Bags Manufacturing Process

  • Blend
  • Thaw
  • Pumping air
  • Pass through the rollers
  • Heat-seal and cutting

Blend Plastic Bags Manufacturing Process

Blend Plastic Bags Manufacturing Process in pakistan

Different densities of polyethylene are mixed to form a homogeneous mixture consisting of low density and high-density polyethylene. These are usually in the form of plastic beads.

Thaw Plastic Bag Manufacturing Plant Cost

Thaw Plastic Bag Manufacturing Plant Cost in pakistan

Thaw: The mixture is then melted in an extruder that melts polyethylene around a temperature of 350–500ᵒC.

Pumping air Plastic Bag Manufacturing Project Report

Pumping Air Plastic Bag Manufacturing Project Report in pakistan

It forms a film of plastic (polyethylene) in the shape of a tube as air is being pumped vertically through it.

Pass through the rollers Ldpe Bags Manufacturing Process

Pass Through The Rollers Ldpe Bags Manufacturing Process in pakistan

Slowly the plastic tube is cooled and rolled into sheets by several rollers which will eventually form plastic bags.

Heat-seal and cutting Shopping Bag Production Process

Heat-Seal And Cutting Shopping Bag Production Process in pakistan

After passing the sheet through the rollers, the bags are made by heat sealer and cutting the film rolls. The machine that performs this heat sealing and cutting does its job according to the measurement established to extract the required length of a plastic bag.

So if it is small plastic bags, the machine cycle speed can go as high as 70,000 bags per hour, but in the case of large polyethylene bags can go as slow as 200 bags in an hour!

Custom requirements

Plastic bags are finally made when two sheets of plastic are pressed together according to the desired size, shape, and diameter. At this stage, various customizations of plastic bags can be obtained according to the buyer’s wish or the type of bag that can be used.

Impact of plastic bags on the environment

The thing with plastic bags is that they break instead of biodegradation, and even over 1000 years. Petroleum products used in plastic bags are not decreasing at a desirable rate. It has the most impact on our planet’s marine population and marine environment.

Aquatic organisms may eat these small pieces of organ micro-plastic ‘accidentally or as a possible source of food for spoilage, which will have a detrimental effect on their health and habitat. Plastic can significantly alter the rate and reproductive cycle of marine animals. The death of aquatic wildlife has increased proportionally as the production of plastic bags has increased.


The first thing is that we should try to remove all the plastics and recycle them to prevent pollution. The plastic can be brought back to its original molecular state, as it was before it was converted into a commercial product through a process of pyrolysis. Pyrolysis is a process in which an oxygen-deprived chamber is heated to bring the plastic back to its pure molecular form.

In the Plastic Bags Manufacturing Process, The process of self-blowing film is very environmental and very effective. The growing trend towards bio-plastic bags is also very encouraging. Continuous promotion and marketing of bioplastics will reduce the pollution presently generated. However, more efforts and work are needed to increase bio-plastics efforts.

As time is advancing people have moved to more environmentally friendly biodegradable plastic bags that do less harm to our environment. Cellulose-based materials are also currently being made through the fermentation process to resemble sheets of plastic bags. 3D printers are being used to make bags, where most of the plastic is sourced from biological sources.

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