What Is Bag Making Machinery?
Bag-making machinery is used to make bags of various materials for packaging.
Recently, bag making is often combined with bag stuffing, and stand-alone machines are becoming less common. However, in supermarkets and agricultural production areas, ready-made bags are still used for packaging and are still in demand.
Rectangular bags with square bottoms are the most commonly produced type of bags, and other well-known types include plastic shopping bags and paper bags with handles, often used in department stores.
There are two types of handles for paper bags with handles: round strings and flat strings and different bag-making machinery is used for each type.
Principle of Bag Making Machinery
Bag-making machinery is often used by specialized manufacturers who deliver finished products to a wide range of customers.
OPP (oriented polypropylene), CPP (non-oriented polypropylene), and PE (polyethylene) are well-known materials for plastic film used in bag-making machinery.
Other materials used include NY (nylon), PET (polyethylene terephthalate), AL (aluminum foil), and aluminum evaporated film. Aluminum vapor-deposited film is a material used for retort-pouch foods, which has become well-established recently.
How to Select Bag Making Machinery
Bag-making machinery can be selected based on the bag-making configuration.
- Three-side seal
This is the most orthodox type of pouch and is the type often seen these days in products such as “stand-up packs” that can stand on their own feet. Bag-making machinery may vary for the same type depending on the zipper and the size of the bag. - Half-fold type
Unlike the three-side-seal type, this type is made by folding back one seal and sealing on two sides. Since the bottom is not sealed, this type is strong and suitable for relatively heavy or large-volume products. - Center seal
Like the half-fold type, this type uses a single sheet of film, but it is folded on both sides and sealed at the center. - Melt-cut type
This type uses a single sheet of film for both sealing and fusing, making it possible to produce bags with special shapes such as triangles and trapezoids.
In addition, the type that can also be used to add pouches with a spout, which is becoming more common these days, is also available.