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How to check whether the vacuum packaging bag is qualified

1, Inspection of raw materials:a. Thickness of film (aluminum foil) (pressGB 6672progress), tensile strength&Elongation(according toGB 13022-91conduct), wetting tension(according toGB 10003-88conduct), oxygen permeable/moisture permeability(according toGB1038/ 1037conduct), high temperature resistance, hygienic suitability(meets theGB-9687-88), the appearance of vacuum packaging bags;b.High temperature resistance of adhesives and inks, food hygiene suitability.2,Inspection of film (aluminum foil) lamination process:a.Exterior(Visually no obvious defects such as wrinkling and delamination);b.Compounding speed, viscosity of glue: the measured value is different depending on the adhesive used and the ratio;c.Glue quantity detection:Use coated paper (or self-adhesive glossy paper), and divide it into three different positions: left, middle and right.Put it in the middle of the two layers of film to be compounded, and remove the sample after compounding. then use100mm100mmThe area square, cut out the measurement samples according to the left, middle and right positions; then remove the coated paper (or self-adhesive paper), put the glued film into the electronic scale and weigh it, and record the weighta. Then put the weighed film (coated surface with glue) into the solvent (EA) to remove the glue, then put it on the electronic scale to weigh, and record the weightb.AbThat is, the amount of glue applied to the sample, and then converted intog/m2unit can be used.d.Control of curing temperature and time after compounding: according to the different raw materials used, set the corresponding temperature and time;e. Composite strength between aged composite films(according to8808-88conduct);Cut out the left, middle and right test pieces, the width of the test piece15mm, with a length of approx.15cm, the peeling between the layers to be tested is separated by about15mm, respectively fixed atLDX-200On the upper and lower clamps of the universal material testing machine, the tension speed is adjusted to100mm/minto measure.f. Residual solvent content of vacuum packaging bag: cut0.2m2sample,Quickly cut samples into10mm30mmdebris, put in a clean80preheated at ℃500mlIn a conical flask, sealed with a silicone stopper, put80℃ heated in incubator30minAfter that, use5mlSyringe take1mlGas sample injection in bottle2061Cmeasured in a gas chromatograph, and the results were≤10mg/m2is qualified.

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