The main cause of food sack appeared quality problem

make food packaging use of main raw materials are polyethylene, polypropylene, polyester, polyamide and other polymers of plastic materials. These packaging materials by the molecular structure and molding process and adding different additives showed a larger difference. For food manufacturers, therefore, choose a suitable product packaging is especially important for the principle of material, only qualified according to the requirements of this international production product selection and suitable material to * packaged foods.

what what are the cause of food sack appeared quality problem? For you to solve this problem:

1, the first is about solvent residue problem: food packaging molding generally need blow molding, printing, composite, bag making process, such as to improve the optimum printing to speed up the printing speed, usually add some solvents, such as propylene glycol, toluene, etc. , 'lanzhou event' after solvent residual problem has increasingly become the focus of packaging * sex. Solvent residue of national standard to less than 10 mg/m2, enterprise standards are generally higher than the national standard is less than 7 mg/m2, total for the solvent residues can use gas chromatograph for testing control.

2, the second is used in printing ink performance issues: food packaging bags selected film in addition to the general to the requirement of printing ink and substrate adhesion strength, abrasion resistance, but also be able to deal with the request, sterilization and water resistance, frost resistance and heat resistance in order to make sure not happen in the process of transportation, storage, printing ink, the phenomenon such as condensation. According to GB7707 used printing fastness testing machine for testing.

3, moreover is the packaging of the blocking performance out of the question: bad food has a great part of the reason is because when making food sack blocking performance of selected materials is not appropriate. The choice of material according to different folded, shelf-life, storage condition etc. Choose the appropriate block material. At the end of 2005's GB19741-2005 ( Liquid food packaging plastic composite film, packaging standard) The packaging film barrier property is put forward using GB/T1038 ( Plastic membrane permeability test method) And GB/T1037 ( Plastic film and sheet of water vapour permeability test method) For testing.

4, in also is the problem the tensile properties of the used plastic film, packaging film by the mechanical strain in the process, and in the process of transportation will be affected by external force such as extrusion, which requires the film must have enough tensile strength. For composite membrane should guarantee the membrane interlayer stratification, which requires the composite membrane has high peel strength, so as to avoid material stratification. Can choose electronic tensile machine to control the tensile properties and stripping performance.

that is food packaging usually appear some problems, and the main reasons causing the problem.