Application of forming bag-packing process in packaging machinery
In recent years, there has been great development due to the development of packaging materials and the increasing demand for flexible packaging pouches in the market. Because this bagging technology has high production efficiency, low cost, material saving and one-time completion of bag making, filling and sealing, it can reliably ensure packaging quality and meet food hygiene requirements, so it has been widely used. The forming bag bagging process can be divided into vertical and horizontal types according to the overall layout of bagging machinery. In the vertical bagging process, the filling of bag-making materials is carried out vertically. The variety of products that can be packaged and the size of packaging bags are very wide. It can be used for one-time measuring bags of liquid, semi-fluid and powder materials. There are two types of packaging materials suitable for the stand-up bag-in-bag process: thermoplastic materials and heatable materials. Polyethylene is a thermoplastic material, but the polyolefin film needs to be melted under certain controlled conditions until the adhesive surface is integrated with the skin. In order to ensure the sealing quality, the sealing process must be strictly controlled according to the specified sealing process. The vertical forming-filling-sealing packaging machine adopts the pulse heating method to seal the thermoplastic material. When power is applied to the nickel-chromium wire, the nickel-chromium wire is heated to a pre-set temperature that allows the material to melt and fuse. The pre-set temperature depends on the thickness of the film material. The pulse heat sealing method does not require the use of any pressurized tools. Non-heat-sealable or difficult-to-seal materials include: paper, cellophane, and certain co-extruded and laminated composites, which need to be integrated as they cannot be melted or fully melted at the sealing temperature layer so-called heat seal layer. The heat-sealing layer enables the packaging material to be formed and sealed under appropriate temperature and pressure. According to the requirements of the packaging form, the heat sealing layer of the roll packaging material can be single-sided or double-sided. The stand-up bagging method can be packaged into four-side seal pockets, three-side seal pockets and pillow bags. The four-side sealing bag filling machine has two models: single-row and multi-row. The production capacity of the single-row machine is 20~200 bags per minute, depending on the filling method; the multi-row machine is from 2 to 10 rows, and the production capacity is 300~200 bags per minute. 1500 bags, depending on the number of columns used, when the machine speed is the same as that of the single-row machine, the productivity can be increased several times; folding molding is to use the shape of the former to force the flat packaging material to be approximately folded into bags, common molding There are U-shaped shapers, elephant trunk shapers, triangle shapers and so on.
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