Check whether the vacuum bag is qualified
1. The inspection of raw materials: (1). The thickness of the film (aluminum foil), tensile strength & elongation, wetting tension, the air/moisture permeability, high temperature resistance, health fitness, the appearance of the vacuum bag bag;
(2). High temperature resistance of adhesive, printing ink, food hygiene suitability;
2. The film (aluminum foil) composite process of inspection:
(1). (visual appearance without obvious defects such as wrinkling, abscission);
(2). The viscosity of compound speed, glue: according to the difference of the used binder and proportioning, measurements are different;
(3). Detection of glue quantity: with coated paper (or adhesive glossy paper), left, right and in three different locations, in between thin film was on the point of composite, composite and remove the sample.Then press with mm100mm area of 100 square, left, middle and right three different slice the determination of the location of the sample;Then remove the coated paper (or adhesive paper), put the glue film on electronic said weighing, write down a weight.After weighing up the film (with glue coating surface) in the solvent (EA) washing away all glue liquid, and then into the electronic scale weighing, and make a note of the weight b.A - b is the sample amount of glue, then convert to the unit of g/m2.
(4). After composite curing temperature, time control: according to different raw materials used, set the corresponding temperature and time;
(5) composite membrane between the composite strength after curing;Slice the left, middle and right three specimens, the specimen width 15 mm, about 15 cm in length, will test about 15 mm stripping separated between layer and layer, respectively fixed on the LDX - 200 universal material testing machine, fixture, under tensile speed to 100 mm/min.
(6). Vacuum bag of residual solvents: cropping 0.2 m2 samples, sample cutting into 10 mm30mm pieces quickly, under the condition of 80 ℃ preheat is put in the clean out of about 500 ml conical flask, using silica gel seal, in the 80 ℃ heating after 30 min in the constant temperature box, with a 5 ml syringe take 1 ml bottle of gas from the determination of injection gas chromatograph 2061 c, the result is qualified to 10 mg/m2 or less.