What Is a Poly Tube Bag Printer?
A poly tube bag printer is a machine that produces poly bags by printing, heat welding, and cutting polyethylene sheets. These printers are used for packaging and wrapping, utilizing both low-density (LDPE) and high-density (HDPE) polyethylene, each chosen for their specific properties like strength and transparency.
These printers employ thermal transfer and gravure printing methods, making them suitable for printing detailed characters, barcodes, and symbols. They are versatile for various industries and can handle mass production. Some large printers can perform the entire process, from feeding materials to printing, welding, and cutting.
What Is Poly Tube?
A poly tube is a tubular sheet of polyethylene used in packaging and wrapping. After cutting, it’s sealed at both ends with string or tape. Poly tubes are made from LDPE, known for its softness and transparency, and HDPE, known for its strength. Ultra-high-molecular-weight polyethylene is also used, offering high impact and abrasion resistance.
Poly Tubing Material
Polyethylene, the material for poly tubing, is a polymer noted for its strength, chemical resistance, and lubricity. LDPE and HDPE, its two main types, differ in density and physical properties. LDPE is transparent and soft, ideal for simple packaging. HDPE offers higher impact resistance and heat resistance but is less transparent and flexible.
Structure of Poly Tube Bag Printers
Poly tube bag printers consist of a holder, a printing unit, a sealing mechanism for heat welding, and a cutting component. Thermal transfer is the primary printing method. These printers automate the process of printing, welding, and cutting, enabling mass production of detailed product information and graphics.
Gravure printing is another method, where a pattern is transferred from an ink-soaked plate cylinder to the film, aided by a pressure cylinder. This method also supports the complete bag-making process, from printing to cutting.
Applications of Poly Tube Bag Printers
Poly tube bag printers are versatile in industries like food, medical, electronics, and agriculture. They can produce bags ranging from small to large sizes. Advanced machines handle the entire process, from material feeding to final bag production, suited for large-scale and diverse bag sizes.