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This paper briefly introduces the quality inspection items of paper packaging

Date: 2021-12-22 09:24
Views: 1224
Abstract:
This paper briefly introduces the quality inspection items of paper packaging
 

The properties of paper can be divided into physical properties, optical properties, chemical properties, electrical properties and microscopic properties. The physical properties include thickness, weight, density, stiffness and tensile strength. Optical properties include light transmittance, light absorption and reflectance. Chemical properties include
PH and moisture. Electrical properties include dielectric strength, specific strain and conductivity. Although some paper properties have been discussed in other chapters, such as wettability in sizing and moisture resistance in resin coating, most of the paper properties are studied in this chapter.
Any paper inspection report, if it does not mention these visual inspection, for example, the inspection of paper touch feeling, brittleness, sound and appearance, is mostly incomplete report. These tests used to be widely used in the past. Now, most of them have been replaced by physical tests, but in a considerable number of paper trade, these sensory tests are still used as the basis. According to Strachan, the appearance test is a rough and general impression of the smoothness and finish of the paper, as well as the bending resistance of the paper to the common weight. An experienced papermaking worker can get a lot of information about paper properties from the appearance inspection, but these data can not be expressed by numbers. As a result, the paper industry and the paper industry quickly adopted technical standards. In most cases, more standard patterns are provided for each order to check the finish, color and evenness of the paper at delivery.
For the paper to do some inspection, the main play according to the use of paper requirements. This kind of test imitates the actual situation of paper in use, and generally it has more complex properties. It includes: printing test of printing paper, coating of base paper and inspection of coated paper, bonding paper on small test bonder, etc. Some examples are given, such as the determination of the moisture resistance of cardboard that has been made into boxes, and thus to obtain complete information on the corrugation, folding, handling and sealing properties of the board. In addition, for example, the processing and inspection of corrugated board, which contains engineering and technical problems, is no less important than the physical properties of cardboard. For example: on the paperboard processing process of scoring, folding, can seriously affect the overall strength of the box. Although the strength of the cardboard and the strength of the corrugated paper box have a corresponding relationship, but corrugated board manufacturers believe that the finished paper box in the case of full, inspection. For example, compressive strength, * deflection under large pressure, friction resistance on drum tester and other similar inspection are often used to inspect the finished carton. The advantage of usage test is that it can provide information on the performance of paper; Its disadvantage is that the test results can not be expressed in terms of general knowledge, and there is no connection with other inspection.


Jinan Chenchi main business: Sealing tester , Viscosity tester , Packaging sealing tester , Electronic tensile machine , Film friction coefficient tester , Burst tester , Paper tensile testing machine , Paper folding tester , Paper smoothness meter , Paper ring pressure tester