Blown films have more balanced in mechanical properties than simple or extruded films because it passes through various machines and traverse directions. Stretch film manufacturers also make sure that the thin film produced is tensile, flexible, and robust.
A large film, two smaller thin films, or other shapes of the film can be produced via blown filmextrusion.
Excessive trimming is not needed after the film is manufactured, and a single die can be used to make different shapes and sizes of the film.
Compared to the cast extrusion, the lower melting temperature is required in blown film extrusion. It reduced the cost of manufacturing
The aforementioned application shows how important film extrusion is to various industries, especially when it comes to the packaging, shipping, manufacturing, construction and agriculturalmachinery.
WHAT IS BLOWN FILM?
Blown Film is a manufacturing process that produce films of plastic sheeting and tubes. These sheets or tubes can either be fully cylindrical, or have other object inserted into them so they form useful objects like shopping bags, rubbish bags or cling wrap. In this article, we will explore what the process of blown film is and how and why you would use it. The process of blown film is reasonably simple. First you must take plastic pellets and heat them to their melting point (like injection moulding). The plastic is then forced through a cylindrical die and forms a thin walled bubble. This bubble is sustained by air, and is fed up through a scaffold where the tube continues to rise. Over this length, the plastic begins to cool. Once it has cooled enough, it is collapsed down on itself, forming a flattened tube. This tube is passed through various rollers and spun onto a spool. The edges of the tube can be trimmed and it can also be punched, cut or printed on before going on the spool. Blown film manufacturing is great for producing products that require uniform properties along the length and width of the product. It’s also a great high volume production method, however it requires massive capital cost to purchase a blown film machine. Blown film can produce up to 130 metres of products in a single minute. The sheets and film they can produce can be as fine as 10-20 microns (0.01mm – 0.02mm) to 250 microns (0.25mm) thick. Most Blown film is either High or Low Density Polyethylene (HDPE or LDPE) but there are exceptions. The downside to blown film is that it can only product sheets or tubes.
What makes ABA machine special for bag production?
Technically, in ABA type film, the outer and inner layers will be of the same material fed by the same extruder and a middle layer will be of a different material that will be fed by a second extruder. A higher percentage (up to 50-70%) of calcium carbonate compounds or recycled material can be used in the middle layer of the film, thus cutting down the usage of virgin raw material and reducing production cost.
This AB Film Blowing Machine is used for blowing the various kinds film of HDPE, LDPE, LLDPE etc, referred as to low density polyethylene (LDPE), high density polyethylene(HDPE)and linear low density polyethylene(LLDPE) etc, which are widely used for printing, agricultural,packing industrial, garments , textile, and making plastic bags, like T-shirt bag, flat bag, and other daily usage bag, etc. The produced film is very flat,reel is high-quality by the use of reversing haul-off units.
The production line of 2-layer co-extrusion blown film machines can be used for the production of a wide range of general packaging films, and can be used to produce symmetrical film, including liquid packaging film, shrink/stretch film, electrostatic protection film, waterproof film in ponds, heavy packaging film, etc. Forced feeding main machine: All main machines of PLASTAR adopt dual-alloy forced-feeding screws that feature excellent hardness and wear resistance.
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