Shenzhen bubble bag, Shenzhen anti-static bag - plastic film inspection common sense
Shenzhen bubble bag, Shenzhen anti-static bag - plastic film inspection common sense
In plastic packaging materials, various plastic film bags and composite plastic films have different physical, mechanical, heat and hygienic properties. People choose the right materials to use according to the different needs of the packaging. How to evaluate the performance of packaging materials? There are many test methods at home and abroad. We should give priority to those methods that are scientific, simple, and have small measurement errors. Priority is given to ISO international standards and international advanced organization standards, such as ASTM, TAPPI, etc., as well as China's national standards and industry standards, such as BB/T standards, QB/T standards, HB/T standards, and so on.
Let me introduce you briefly. Shenzhen aluminum foil bag, Shenzhen anti-static bag, Shenzhen PE plastic bag, Shenzhen pearl cotton bag
Specifications, appearance
As a packaging material, plastic film is sized to meet the needs of the contents. The appearance of some films is closely related to the shelf effect, and the appearance of the problem directly affects the sale of goods. Thickness is one of the factors affecting mechanical properties and barrier properties, and it is necessary to find the optimal indicators in terms of quality and cost. Therefore, these indicators will be specified in the requirements of each product standard. The corresponding requirements for testing methods are generally:
Thickness measurement
GB/T6672-2001 "Metal measurement of plastic film and sheet thickness" This non-equivalent use ISO4593: 1993 "Plastic - film and sheet - thickness measurement - mechanical measurement method". The thickness of the film and the sheet is measured by a mechanical method, that is, a contact method, and the measurement result is a result of measuring the material between two measurement planes. The load applied to the sample should be between 0.5 N and 1.0 N. This method is not suitable for testing embossed materials.
2. Length, width
GB/T 6673-2001 "Determination of the length and width of plastic film and sheet" is not equivalent to the international standard ISO 4592: 1992 "Plastics - film and sheet - determination of length and width". This standard specifies the baseline measurement method for the length and width of the web and sheet.
The size of the plastic material is greatly affected by the ambient temperature, and the operating tension during unwinding also causes the dimensional change of the material. The accuracy of the measuring instruments will also cause differences in measurement results. Therefore, every detail must be taken into account in the measurement so that the measured result is close to the true value.
The standard stipulates that the coil should be opened with a minimum pulling force before the measurement, and no more than 20 layers of the length of no more than 5 m as the sample to be tested, and kept in this state for a certain period of time, The measurement is performed after the size is stabilized.
3. Appearance bag
The visual inspection of plastic film bags is generally carried out under natural light. Appearance defects are specified in GB/T 2035, Plastic Terminology and Definitions. The size of the defect is generally measured using a universal measuring tool such as a steel ruler, a vernier caliper, or the like.
Physical and mechanical properties
1. Plastic mechanical properties - tensile properties
The tensile properties of plastics include tests of tensile strength, tensile fracture stress, tensile yield stress, and elongation at break.
There are several national standards for the test methods for tensile properties of plastics, which are suitable for different tensile properties of plastics.
GB/T 1040-1992 "Test methods for tensile properties of plastics" are generally applicable to thermoplastic and thermosetting materials, including filled and fiber reinforced plastic materials and plastic products. Suitable for materials with a thickness greater than 1 mm.
Information Sources:
GB/T13022-1991 "Test method for tensile properties of plastic film" is equivalent to the international standard ISO1184-1983 "Determination of tensile properties of plastic film". It is suitable for plastic film and sheet with thickness less than 1mm. This method is not suitable for tensile test of reinforced film, microporous sheet and microporous film.
Information Sources:
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Source Sample Handling Equipment,Source TCM Decapper 1/6/8 channel
Topscien Instrument(Ningbo China)Co.,LTD , https://www.centrifugesupply.com