In the production and processing of the film, one kind of raw material is squeezed onto another kind of film that has been made, or various kinds of films that have been made are bonded to each other to become a multilayer film. This product is Jiajing Plastic is called "composite film".
The raw material of the composite film is mostly plastic, but paper, metal foil (usually aluminum) or textiles can also be used.
The basic requirement of the composite film is to have excellent adhesion between the layers to ensure the overall physical properties of the packaging.
The composite film is generally composed of plates, laminating adhesives, insulating materials, heat-sealing materials, printing and protective coatings, etc.
Co-extruded film has most of the characteristics of composite film, but there is one difference, that is, all layers of co-extruded film are extruded at the same time, so it is not easy to have other non-plastic materials such as aluminum foil and paper. The composition method of its commercial raw materials is relatively small, and the application field is also small. However, because the winter layer and the layer are fused by heat and do not use adhesives, the environmental health safety factor of the co-extruded film of food packaging materials is required. Relativity is reliable.
The key features of co-extrusion film: good tensile properties, good surface chromaticity, and conform to various specifications of glued paper and food film.
The composite membrane is a separation membrane composed of a microporous membrane or an ultrafiltration membrane as a branch layer, and a high-density homogeneous membrane with a thickness of only 0.1 to 0.25 μm as a barrier layer on the surface of the separation membrane. Promote a considerable increase in the throughput of chemical substances.
The raw materials of the composite membrane include all the raw materials that will be fused, such as the ceramic membrane on the hydroxide or the fragrant acrylic plastic film on the polysulfone microporous membrane. The tablet membrane or roll membrane must be non- The woven fabric improves the impact resistance of the microporous membrane at the supporting point, while the membrane does not need to be co-extruded. The compound processing technology is to use several extruders to produce a new type of Multifunctional plastic film. Only one production and processing process can be used to make a double-layer, intelligent composite film, which prevents multiple composite production and manufacturing processes, reduces costs, energy consumption and raw material costs, and produces zero pollution during the processing process. There are also active solvent coating residues, which can save up to 30% of the product cost compared with other composite processing techniques.
This kind of plastic film can be equipped with different two-components in accordance with the customer's regulations, so as to achieve different isolation regulations and cost regulations. The double-layer co-extruded plastic film has high barrier properties and high light transmittance, which can visualize the shape and quality of turnover materials. At present, the use of co-extruded film in developed countries has accounted for about 40% of the total packaging film.
To put it simply, if you are a plastic composite type, for medical packaging or food packaging materials, you can consider co-extrusion film/If you are a composite type of aluminum-plastic composite, paper-plastic composite and other plastics and other raw materials, then there is no choice. Only composite membranes can be used. Composite film also includes plastic-plastic composite type. Difference: Co-extrusion film: There is no super glue between the film and the film. Composite film: the use of the film and the film. The two types of super glue composite are different processing techniques and will not have cost problems. No need to think about saving costs and changing raw materials.
