Plastic bags are a major part of everyday life. From receiving packaged shipments to grocery shopping, many of us are accustomed to using them. But, what goes into manufacturing different types of plastic bags? Plastic bag manufacturing involves more than what one might think. Knowing the process can help you determine the products that are quality made versus the products that won’t hold up as waste. Obviously, the plastic bag manufacturing process must be done in a shop using the right equipment. Despite this, these bags are quite easy to manufacture. Would you like to know the stages involved in plastic bag manufacturing? This post answers the same. Read on to know more.
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With the following steps, let’s have a closer look at how plastic bags are made.
Step 1 – Raw Material Extraction: Extraction of raw material is the most important step in manufacturing plastic bags. Polythene is used to manufacture plastic bags. This material is derived from either refined oil or cracked natural glass. As these hydrocarbons are found underground, they must be extracted using the drilling wells. If leaks occur during the process, it not only disrupts the ecosystem but also leads to tragic consequences for human health and the environment. This extracted gas or oil is transferred through pipes to refineries where petroleum is divided into several densities. This will helps extract the right oil required for plastic production. This gas is heated to a high temperature and pressurized to separate pure polythene chains, which are later joined to form plastic resin pellets.
Step 2 – Film Extrusion: The process begins by providing plastic pellets from a hopper to the extruder barrel. An extruder heats the material to the extreme and melts it. Using the inside screw, an extruder pushes the molten polymer through the machine and a die, which controls the product thickness. Air pumped inside an extruder makes the evolving plastic into a bubble that travels in an upward direction for cooling down. Once the air is strained out and the bubble flattened, the film is cut into the appropriate shape and wrapped on a spindle.
Step 3 – Conversion from Film to Plastic Bags: In this step, the role of the film is unwrapped and cut into a desired size and shape depending on the commercial intent for the bag. This stage can also add special characteristics required to complete the plastic bags. The wheels are designed to create the gussets, dies care is used to cut out the handles, and most importantly seals get attached due to heat. Printing can be done once the bags have been converted.
Polyethylene is one of the most widely used plastic types and is made from the polymerization of ethylene gas. Polythene or polyethylene finds applications across industries. There are many types of polyethylene bags based on density, bag type and so on. There high density as well as low density polyethylene bags. High-density plastics which are absolutely non-permeable are used in making pipes, tanks, and so on. On the other hand, low-density plastic is used to make shopping bags, water bottles, and so on. Low density polyethylene bags (LDPE) are extensively used in retail and FMCG as shopping bags. Based on the type of bags, they are broadly categorized as gusseted bags, flat bags, and more. This post discusses different types of polyethylene, various applications of polyethylene bags, and more.
The process of polymerization of ethylene results in long linear chains of hydrocarbons branching in various directions. The degree of this branching decides the type of polyethylene. This branching also lends typical characteristics to polyethylene. This section offers insights on four types of polyethylene - HDPE, LDPE, LLDPE, and MDPE that are used to make bags for different applications.
Presenting a selection of our finest HDPE bags manufactured by Universal Plastic Bags:
Follow is a range of our finest LDPE bags manufactured by Universal Plastic Bags:
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Follow is a range of our finest LLDPE bags manufactured by Universal Plastic Bags:
If you are a business owner, especially in the food or retail industry, you may need trash cans liners and plastic grocery bags in bulk. However, ensure you source good-quality plastic bags that meet the industry norms state regulation. Also, make sure you get these bags from a reliable manufacturer and supplier such as Universal Plastic. The company provides a variety of polyethylene bags including custom shopping bags in different specifications to meet your application requirements.
The main types include HDPE (High-Density), LDPE (Low-Density), LLDPE (Linear Low-Density), and MDPE (Medium-Density). Each has distinct characteristics and applications.
Both HDPE and LDPE are commonly used for shopping bags. HDPE offers more strength, while LDPE provides flexibility and softness.
Yes. FDA and USDA-approved LDPE and LLDPE bags are safe for storing food items and are commonly used in grocery and foodservice packaging.
Absolutely. HDPE is durable, moisture-resistant, and has high tensile strength, making it ideal for packing industrial goods like fertilizers and cement.
LDPE has long and short chain branching, making it more flexible but less strong. LLDPE has short, uniform branches, offering better puncture resistance and tensile strength.
MDPE is used for trash can liners and protective packaging where medium strength and good impact resistance are required.
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