Packaging was an early need for mankind to store, transport, preserve food, goods, products … At the earliest, people made skins made from animal skin, large leaves, vegetables to clean and tasty foods. During the war, iron and steel were guessed to keep the soldiers safe. In everyday life, many materials have been used: paper, glass, wood, corn, aluminum … With the dramatic innovation of technology, people from different areas, the growing number of countries grow and the demand for trade grows day by day, packaging is the most convenient way necessary and vital. The plastic bag has been invented to satisfy this demand as an excellent solution. So how are plastic bags made?
Plastic is the by-product of oil refining and only uses 4% of all oil production in the world. This is a "biogeochemical" manipulation of certain properties of oil, the polymers that behave "plastic". Plastic polymers are made of 5 main types, from which plastics bags are made from a known type of polyethylene. Producing Polyethylene Resins and Directly in Plastic Bag Production
Special types such as food plastic bags, shopping bags, luxury plastic bags for famous brands such as soft loop plastic handles, rigid plastic handles, cord plastic handles, triple plastic handles, wavy plastic handles, etc. 100% virgin resins are used for the production of the best quality sachets: strong, smooth and beautiful appearance. Customers also require other film shades of different plastic bags (blue, green, orange, yellow, red …) to make the sacks different and impressive. Manufacturers therefore deliver masterbatches (colored resins) to make them transparent to the given colors. If customers want cheaper bags, manufacturers will only add a few percent of additives such as CaCO3 (calcium carbonate) and recycled materials to reduce bag costs. In this case, manufacturers sometimes add the additive called shock modifier to make the sacks strong. When customers require plastic bags that can easily be destroyed on land, suppliers must use biodegradable additives for EPI or DW2 1 or 2% for extrusion
Procedure 1 blows film or extruding film. All materials must be placed in an extrusion machine to make a large plastic film roll. In this step, workers or technicians must have a smooth appearance.
The second step is the printing process that is primarily used for shopping bags that can be used by many companies to personalize the print image with a logo, brand name, product information … When ordering, manufacturers are creating printers (print cylinders) for print machines. The images are analyzed in different colors; each color is controlled by a colleague when the bags are printing a variety of colors or difficult to print.
The third step is cutting and closing. The plastic rolls are placed in a slaughterhouse to have different shapes and different handles. A variety of cutting machines are available for different handles: T-shirt, cut cut, soft loop, patch handle, rigid, flat goods etc.
For special varieties such as. Plastic handlebars, rigid plastic handles, soft-handle plastic handles usually require manual steps that can not be carried out on an automatic machine. In the handheld workshop, workers should sew the handles in the bags, cardboard boxes (tailored to the customer's needs), punching …
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