Testing method for packaging bags made of the hott

2022-07-30
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Inspection methods for packaging bags made of composite materials

inspection methods for packaging bags made of composite materials:

① visual inspection of appearance: visually inspect whether there are obvious scratches and pinholes on the surface of composite bags. It is important to check whether the sealing is stained with the details of the flexural strength test of the concrete block. If one of the above conditions is found, it is unqualified

② sealing tightness inspection: some tiny cracks can not be immediately judged by visual inspection. A little negligence is the cause of future leakage and corruption. To check the sealing defect, a surface activator with dye can be sprayed into the seal to see whether it is penetrated or not, so as to judge the tightness of the seal

③ sealing strength test: cut the seal of the inspected composite bag into a long strip with a width of 15mm, and use the universal material tester to measure the sealing strength at a speed of 300 20mm/min. Generally, the sealing strength of the composite bag should reach 23 ~ 34n/15mm

see the following table for the sealing strength standards of various bags

purpose sealing strength, n15mm (kgf/15mm)

large package: 34.3/(3.5)

composite bag: 22.6-34.3/(2.3-3.5)

general package, large content: 14.7-22.6/(1.5-2.3)

general package, Small content: 5.9-14.7/(0.6-1.5)

general light packaging: 2.9-5.9/(0.3-0.6)

④ leak detection test: dye penetration method; It is usually used to test the leakage or pinhole of the composite bag with little air content to establish the macro-control and market conditioning mechanism. The method is to add surfactant into the bag, place the bag on the filter paper after sealing, check whether there is color solution on the filter paper after 5 minutes, and then test the bag in reverse

water decompression method

check whether the composite bag with more air content leaks. The method is to put the composite bag to be tested into a device, start the vacuum pump, reduce the pressure in the glass bottle to 1333pa (10mmhg) within 30 seconds to 1 minute, and maintain it for 30 seconds. If there is a bag leakage, there will be bubbles overflowing

⑤ compressive strength test: place the composite bag horizontally on the platform, add a heavy object on it, keep it for one minute, and then remove it to check whether there is leakage in the appearance. The pressurization method of flat mouth composite bag and box composite bag is slightly different. The pressurization time is 1 minute, and the pressurization weight is different due to the weight of the product itself (see the following table for the standards)

pressure resistance standards of various weights

total weight (g) compression load n (KGF)

<100196 (20)

> 100400392 (40)

> 4002000588 (60)

> 2000785 (80)

⑥ bursting strength test: place the composite bag to be tested between two parallel plates with a gap of 1.27cm (0.51n), install a retainer and a rubber tube on the bag, and within ~ 30 seconds, Slowly pass the compressed air into the bag to make the internal pressure reach to ensure that static electricity will not cause damage to the instrument; Hold the standard for another 30 seconds. The bursting strength of general commercial bags shall be more than 0.1MPa

⑦ drop test: composite bagged products are dropped on the rough cement ground in horizontal and vertical directions, once each. After falling, check whether the composite bag has leakage or perforation. The drop height depends on the size of the composite bagged product. Weight varies (see table below)

drop height standard

total weight (g) drop height (CM)

<100 80

> 100-400 50

> 400-2000 30

> 2000 20

⑧ inspection of air train inventory in the bag: destructive test: Based on the principle of drainage and steam collection method, cut a notch in the compound bag under the water surface, invert the funnel above it to collect the gas floating from the notch, and then connect a water filled volume on the funnel, Finally, the residual amount of air in the bag can be known from the amount of gas filled in the measuring cylinder (for some products with high viscosity, the gas is not easy to be completely discharged, which is easy to cause errors)

non destructive test: it is measured by the original Dutch customer signing principle of Jinan assaying, which is in a suspended state under a certain liquid level pressure and the buoyancy of the composite bag with residual air is just equal to its weight. The tested samples are not damaged and can be used again

the method is as follows: put the test composite bag into a transparent container filled with water, slowly vacuumize, and the vacuum degree when the bag is suspended is called the neutralization point

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