aging is also called curing, is already well into the composite membrane drying room (aging room), the main agent of polyurethane binder, curing agent and crosslinking reaction process is a composite substrate surface interaction.the main purpose is to make the main curing agent and curing agent to a certain period of time the full response, to achieve the best composite strength; second is the removal of low boiling point residual solvents such as ethyl acetate, etc..
curing control is the main control of curing temperature and curing time, curing temperature and curing time is determined by the adhesive performance and the final product performance requirements.adhesive varieties of different curing temperature and time.the curing temperature is too low, less than 20 deg c, the reaction slow curing adhesive; the temperature is too high, the additive effect of substrate membrane separation, membrane performance and increase the odor, such as aging time is too long will also affect the performance of the composite film and increase the odor, which is mainly in polyethylene thin film processing aids caused by precipitation.
kai membrane himore curing condition that also depends on the following factors:
1, pet, bopa, al, cpp film has good heat resistance, high shrinkage temperature, curing temperature can be improved.ldpe, bopp, eva etc. the curing temperature is not too high;
time for 2, the amount of glue of high extension;
3, to film time curing factory shape can be reduced properly;
4, longitudinally ribbed products of its curing time can be lengthened;
5, film thickness, film diameter when appropriate to extend the curing time;
6, in order to reduce the amount of residual solvents may prolong the curing time;
7, adjust the curing time according to the use of the products.
there is an accelerated aging, for control in production.just take the composite film production of about 1 meters long, full width, in a 80 degree oven for 30 minutes, to check its appearance and peeling, found problems in a timely manner, to take measures.this is one of the indispensable dry compound process management.
the following requirements for curing room:
1, the aging room size, position should be based on the convenience store turnover to build, to facilitate the film roll out, to open the door conveniently;
2, the cooking chamber height is generally at 2 2.5m, a top tower, to save 5 10cm of the air outlet, can be directly outside, or with a small exhaust fan exhaust timing is discharged, the smell of the cooking chamber;
3, the barn roof installed ceiling fan, ceiling fan can rotate the slaking chamber temperature uniformity, can damage the package in the air film cooler;
4, the cooking chamber can be used on goods to celebrate the keping rack type, in accordance with the terms and conditions of the transportation, but not the film directly erect or lying on the ground;
5, the aging room walls, door, roof insulation, general use of perlite, foam board, thermal insulation function is to increase the time, energy saving and cost reduction, and around the same temperature;
6, heating control.the cooking chamber can use electric heating, steam heating, heating, heating, no matter what, should match the automatic temperature control system, in the room should be set and mercury thermometer to check whether the same; high part should maintain a certain distance or with a baffle and the film, film to prevent local overheating.
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