Introduction to milk processed

Milk is very common in our daily life. But I wonder if you have noticed the milk packaging forms, especially the soft packaging forms. This article made a brief analysis for milk packaging, hope to inspire prepared in relevant industry friends. Common milk processed into all plastic soft bag packaging and paper-plastic composite packaging two categories. In these two categories and can continue to subdivided into a number of different types. We will introduce them one by one. Pure black and white film of pure PE PE black and white film is the earliest form of milk processed. Generally USES the three-tier co-extrusion blown film production process. According to the equipment situation, also can use five or even seven layers co-extrusion blown film production structure. As the name suggests, this film the outside is white, the inside is black. The purpose of this design is to table printed on the outside white; At the same time using the inside black must avoid light effect, extend the shelf life of milk. Milk is high value content, higher requirements on the strength of the packaging. So often use 1 mi linear with a small amount of low melting point to high production, at the same time the heat sealing layer to add a certain amount of metallocene guarantee heat sealing effect. EVOH co-extrusion black and white film relative to pure black and white film, PE EVOH co-extrusion joined EVOH barrier layer in black and white film. So to have at least five layers co-extrusion structure. In fact, many vendors are already using seven layers co-extrusion production structure, in order to optimize formula function design of every layer. The choice of adhesive resin is EVOH co-extrusion need to think a lot about thing in black and white film formula design. Improper selection of adhesive resin can cause lack of EVOH stick relay, delaminating, is also likely to produce water ripple problem. Compared with the pure black and white film, PE EVOH co-extrusion got improved the barrier property of black and white film. So commonly used in the fall, the temperature is higher milk packaging case. Roof package bag takes its name from it in the shape of the roof at the top of the slope design. This kind of milk packaging beautiful, shelf display effect is good, and easy to open it. Packaging structure is simple, generally is the PE film. Just because of the high processing temperature of the PE film process, so you need to choose the low nose film PE production. Since there is no barrier property, therefore the roof package applies only to need to be refrigerated storage of pasteurized milk. Tetra pak cartons is milk packaging form of rapid development in recent years. It is a kind of tetra pak company invented paper lu: su composite packaging. According to the shapes can be subdivided into tetra pak pillow, tetra brick, tetra drill, etc. Due to the tetra pak company patents expire, in recent years, the domestic emerged a large number of domestic tetra pak. Tetra pak packaging materials are through the long co-extrusion film process at a time processing. · Step one: by LDPE film composite cement will be printed paper and aluminum foil together, get & other; Paper/LDPE/aluminum foil & throughout; Structure; · The second step: in the aluminum foil side co-extrusion EAA/heat sealing PE, get & other; Paper/LDPE/aluminum foil/EAA/hot sealing PE” The structure of the; · Step 3: in the paper to the lateral of LDPE to protect the outside printing, get the final products & other; LDPE/paper/LDPE/aluminum foil/EAA/heat sealing PE” The structure of the. Due to the tetra pak back closure is a sealing structure, so need to use special heat in the process of packing seal back seal strength. SIG invented by SIG SIG package promotion. Sig packaging structure similar to tetra pak package, so can be used in the same bull co-extrusion film equipment production. But generally sig package paper thickness is thicker, and because the heat sealing way different sig package requirement for heat sealing PE is different also. Sig bag heat sealing is implemented by using hot air purging heat cover, so low temperature of the heat sealing layer opened higher performance requirements. So sig bag heat sealing PE generally require the use of polyolefin plastic body can meet the requirements.