After high temperature cooking bag broken skin what reason be?
high temperature cooking bags is used for cooking food packaging plastic flexible packaging, in the division, according to the different temperature, in & le; Called under 100 ℃ water resistance, resistance under the 121-125 ℃ is called cooking bags, in & ge; Under the 135 ℃ high temperature cooking bags. In the process of cooking, a lot of people will encounter bags broken situation, these are caused by what reason?
a, high temperature cooking bags, the use of the oil film or glue did not conform to the requirements of the boiled
ink used by high temperature cooking bags, or no matter what type of glue is normally made of polyurethane resin, polyurethane resin by existing high resistance to hot and humid helps to retort pouch adhesive properties and high temperature resistant performance. In this step, therefore, retort pouch rupture may be used by the ink or glue attack of the humidity in the heating process in the water, the hydrolysis of chemical reaction, thus reducing the viscosity of retort pouch, if appear this kind of problem can be questioned ink or glue providers, you can call him by changing chemical structure of the polyurethane resin, of course, a larger food packaging plant can use curing agent to compensate for improve the bonding strength in high temperature cooking bags in cooking.
2, food packaging factory in the use of ink or glue problems in
in high-temperature cooking process, the use of the dosage of the curing agent not up to par and curing time is not enough, retort pouch to cooking time, generally for 48 hours, of course also should according to the actual situation to make corresponding adjustment. In the process of deployment of curing agent, it also depends on how much percentage of, can lead to too much and too little ink layer is broken skin, therefore, all of these need professional personnel to proportion, so as to improve the adhesiveness of water bag.
three problems, high temperature cooking bags, film
retort pouch film will appear processing degree is not up to par, or simply not processing. And staff are often not found this problem, so after printing, composite, curing adhesive fastness is not high, take off a layer (after cooking Broken skin) Only to find the problem. So in the process of packaging production brought about by the harm is enormous, therefore, we need to improve the staff's technology and proficiency.
4, insufficient coordination between ink, glue and thin film
by adhesion theory, we can know is to * high adhesion strength, interfacial tension required *. As a result, the surface of the ink, glue after curing film and film on the surface of the situation because of the different packaging color will be different, because of various groups on the surface of the not well attract form intermolecular forces or react to form chemical bonds, even at low temperature have certain effect and form adhesion, but under the condition of high temperature, surface groups weak connection may be damaged and delaminating.
high temperature cooking bags after cooking delaminating such events, packaging plant to immediately identify delaminating is carefully which occurred in the production process, is clear about what materials, and check whether in accordance with the requirements on production process operation, can exchange material comparison test at the same time, in order to find out the real reason for delaminating.
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