Four edge-sealing bag, 3-side and comparison of the advantages and disadvantages of back seal bags

Four edge-sealing bag or bags after four sides all pass heat sealing packaging form, by far the most common form of granules packaging, mature technology, simple process. Relatively high equipment operation stability, modelling beautiful, good sealing. Four edge-sealing bag is usually divided into two and a half after use of a whole piece of film and other relative packing, belong to the whole heat sealing bag before single bag cutting way, only when the production need to control an edge alignment can obtain good packing effect, thus has a very high packaging material/equipment adaptability and packaging operation stability ( This is very important, because the four edge-sealing bag machine speed slower than usually cartoning machine, common mode for four edge-sealing bag machine with a cartoning machine use, higher requirements for the stability of equipment operation) 。 At the same time, because each edge are evenly heat sealing, bags products after sealing is good. Four edge-sealing bag weakness is lack of adaptability to the packing of the bulk material, because is the entire film bag before cutting, so asked composite film bag making relatively flat, after the bag bag for the plane body, hard into the bulk material, bag space utilization rate is relatively low. 3-side or on one side of the packet for composite membrane directly can be folded in half and the other three sides in the form of heat sealing side. In fact 3-side four edge-sealing bag can be regarded as supplement. Relative to four edge-sealing bag, its advantage is bags to expand into three-dimensional bag type, high space utilization, suitable for bulk packaging requirements, often used in cold granule products such as packaging. 3-side shortcomings also clear, the first type is caused by three edge heat sealing bag asymmetry affect beautiful, beautiful problem of opinion, of course, there is not much discussion. The second packing speed is slower, 3-side machine is the most common form of packaging for the single packing ( That's why three edge sealing is suitable for bulk packing, because only a single can not consider composite film smoothness requirement) , multiple columns of 3-side machine I have not seen, but as you can imagine, if any, large column type 3-side can only adopt to composite film cutting article number then volume respectively made bag, its control difficulty of high return not equal to more than one single package or used to the stability of the unit. Back seal bags ( Also known as Stick packing) The roll of film to cutting sequences, each column after rolled composite membrane separate longitudinal sealing longitudinal sealing side pressure to one side, and then cross way of sealing the bag, originally invented by Japanese companies. Back sealing bag is very obvious, the advantages of the first appearance is very beautiful, and the back, hidden and longitudinal sealing side of bag sealing type characteristic determines its exterior characteristic is bright, bag type of delicate and beautiful, compared with four edge sealing products of the same type have the obvious differentiation advantage. Second, back sealing bag combines four edge-sealing bag more columns packaging speed and at the same time the advantage of high powerusageeffectiveness 3-side space rate, relative to the four edge-sealing bag, in does not affect the production speed can reduce about 40% dosage of package material at the same time, has very obvious packaging cost advantage. Back sealing bag weakness is also very fresh, first composite membrane after cutting each column bag way determines the back seal bags for packaging material/packaging equipment adaptability of the worst, at the same time back sealing bag bag type determines the difficulty of its subsequent finishing boxes, highest so early back sealing bag equipment investment is huge, operation maintenance cost is higher, Is because of the high barriers to entry, to highlight the appearance of the sealing bag bag back differentiation advantage) 。 Second, back sealing bag bag sealing position is composite film bags together with the longitudinal sealing side sealing, so the heat sealing high difficulty, bag sealing below four edge-sealing bag, bag sealing four edge-sealing bag significantly higher than the risk of failure. In a word, whether four edge-sealing bag, 3-side or back seal bags ( Stick the packing) , has its distinctive characteristics and unique scope, some characteristics of both its packaging forms of advantage and its sources of defects. How to choose the appropriate packaging form, should be determined according to the enterprise products and packaging. For high filling quantity products, for example, four edge-sealing bag form it will be difficult to do, while three edge sealing and back sealing bag can better solve the problem. At present, four edge-sealing bag is still the mainstream European packaging equipment supplier's flagship product, the reason is: 1. Is the heat sealing the pursuit of quality; 2. More pages could be free for layout design, to improve the beautiful degree of the packaging, 3. Is the best name card for a product is the reputation of the enterprise and product safety, efficacy, for Europe and the United States, a packaging material costs relative to the product value ratio is extremely low, demand for saving material is not urgent, at the same time, the visibility and reputation of enterprise determines competition advantage of the use of packaging forms demand is not urgent. And, of course, one reason is that back seal bags come from Japan, European and us companies, there is no advantage in this field. This kind of situation in domestic is different, because is difficult to from the enterprise reputation and the product is safe and effective on sufficient competition, enterprise high sensitivity to the appearance of differentiation and packaging costs, back sealing bag has got more and more widely used in domestic.