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What are the processes of producing custom poly bag?

Updated: Oct 8, 2021

Plastic bags or poly bags are the most convenient and inexpensive method to transport products worldwide. They are by themselves easy and cheap to make and also costing the lowest transportation fee which therefore, have led to their extensive coverage in the industrial and consumer usages. A lot of plastic poly bags are produced and used for various purposes, including transporting document, magazines, books and food, and many other general merchandise items. The easiness and low cost of making plastic bags may be is one of the primary reasons for their popular use. However, the production procedure of making the plastic bags still must be done by the business with the equipment needed. Here below we discuss the main processes of producing a plastic bag.


Separation of Basic Materials

Plastic bags (or poly bags) are made from polyethylene, derived from either broken organic glass or synthetic crude oil. These hydrocarbons are primarily located underground and can only be accessed and obtained by the drilling wells. However, this pumping technique tends to disturb local ecosystems, and if a leak occurs, it may have catastrophic effect towards both the environment and general public nearby. The crude mined oil or gas is piped up to a refinery, where another hydrocarbon is separated into various densities. The oil for plastics may be recovered readily. This gas or oil is then heated to a temperature and pressed to separate the pure polyethylene chains, which may subsequently be combined to form resins granules made entirely of plastics. Varying amounts of pressure and temperature are used to make plastic resins pellets of varying proportions, which are then used to make various goods based on their specific volume requirements.

Exclusion of Polypropylene Films

To melting the polyethylene plastic resin, an extrusion warms it to approximately 500 degrees Fahrenheit. The molten plastic is pushed through into the machinery then through a die that regulates the height of the material by a screw within the extruder. The erupting plastic forms a bubble that goes upwards for nearly three storeys to cool down. The plastic sheet is cut to size and coiled around a spindle once the air has been squeezed out and all of the bubbles have squashed.

Converting Films to Poly Bags

The rolls of film will then be unwrapped and sliced with a heated knife, which will bind both ends of the poly bags and cut them to the appropriately sized. The conversion department may add any unique features that are needed for the full poly bag.


Printing of Poly Bags

Printing may occur after the poly bags have been transformed and being made with the correct size. The poly bag, at this stage, is packed into a roll that it can be put onto a machine for unrolling. Once the unrolling process start, one can see the bag is laid flat like a sheet and it will go through some tube shape metal printing plate like a cylinder. Each printing plate, being etched with different logo, graphics, text and/or patterns, will be aided with ink to pressure on the poly bag / poly sheet.


Other Feature via Specific Works and Handy Jobs

The poly bag handles are carved out using dies. That is why it is usually called the die cut handle or punch hole handle. The gussets of the bag are created with wheels via a specific machine but it will be heat sealed by manual work.


If you are interested in producing your own custom poly bag, you are welcome to contact our packaging specialist at www.eplasticbag.com/contact.

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