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Plastic packaging testing instruments need to use which instruments are more accurate?

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commonly used testing instruments for plastics, plastic particles, engineering plastics, recycled plastics and modified plastics
although plastics have many excellent properties, not every kind of plastics can have all excellent properties. Material engineers and industrial designers must deeply understand the properties of all kinds of plastics in order to design perfect plastic products. The properties of plastics can be divided into basic physical properties, mechanical properties, thermal properties, chemical properties, optical properties and electrical properties. Engineering plastics refer to industrial plastics used for industrial parts or shell materials. They are plastics with excellent strength, impact resistance, heat resistance, hardness and ageing resistance. The Japanese industry defines it as “a high-performance plastic that can be used as structural and mechanical parts, with heat resistance above 100 ℃, which is mainly used in industry”
let’s list some commonly used plastic testing instruments

melt flow rate meter: it is used to measure the MFR value of melt flow rate of various plastics and resins in viscous flow state. It is not only applicable to engineering plastics such as polycarbonate, polysulfone, fluoroplastics and nylon with high melting temperature, but also applicable to polyethylene (PE), polystyrene (PS), polypropylene (PP), ABS resin, Polyoxymethylene (POM) Testing of plastics with lower melting temperature such as polycarbonate (PC) resin. Meet the standard: ISO 1133, ASTM d1238, GB /t3682
the test method is to melt the plastic particles into plastic fluid within a certain time (10 minutes), under a certain temperature and pressure (different standards of various materials), and then flow out the grams (g) through a circular tube with a diameter of 2.095mm. The larger the value, the better the processing fluidity of the plastic material, and vice versa. The most commonly used test standard is ASTM D 1238. The measuring instrument of this test standard is melt indexer. The specific operation process of the test is: put the polymer (plastic) raw materials to be tested into a small groove, and a thin tube is connected at the end of the groove. The diameter of the thin tube is 2.095mm and the length of the tube is 8mm. After heating to a certain temperature, the upper end of the raw material is pressed downward by applying a certain weight through the piston, and the weight of the raw material extruded within 10 minutes is measured, which is the flow index of the plastic. Sometimes you will see the expression mi25g /10min, which means that 25 grams of the plastic will be extruded in 10 minutes. The MI value of commonly used plastics is about 1 ~ 25. The greater the MI, the smaller the viscosity and molecular weight of the plastic raw material. On the contrary, the greater the viscosity and molecular weight of the plastic

universal material testing machine (tensile machine): test the tensile, tearing, bending and other mechanical properties of plastic materials
it can be divided into the following items:
1. Tensile strength and elongation ()
tensile strength, also known as tensile strength, refers to the force required to stretch plastic materials to a certain extent. It is usually expressed by the force per unit area, and the percentage of its tensile length is the elongation. The tensile speed of tensile strength test piece is usually 5.0 ~ 6.5mm/min. The detailed test method shall be in accordance with ASTM D638. Strain)。
2. Bending strength
bending strength, also known as bending strength, is mainly used to determine the folding resistance of plastics. It can be tested according to the method of ASTM D790, which is often expressed by the force per unit area. The bending strength of general plastics is better than that of PVC, melamin resin, epoxy resin and polyester. Glass fiber is also commonly used to improve the folding resistance of plastics. Bending elasticity refers to the bending stress generated by the unit deformation within the elastic range when the test piece is bent (test method such as bending strength). Generally, the greater the flexural elasticity, the better the rigidity of the plastic material
3. Compressive strength
compressive strength refers to the ability of plastics to bear external compressive force, and its test value can be determined according to ASTM d695. Polyacetal, polyester, acrylic, urinary resin and meramine resin have outstanding properties in this regard

cantilever impact testing machine and simply supported beam impact testing machine
used for the determination of impact toughness of non-metallic materials such as hard plastic plates, pipes, special-shaped materials, reinforced nylon, FRP, ceramics and cast stone electrical insulation materials
in line with the international standard iso180-1992 “determination of impact strength of plastic hard material cantilever”; National standard GB /t1843-1996 impact test method for rigid plastic cantilever beam and mechanical industry standard JB /t8761-1998 impact test machine for plastic cantilever beam

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environmental test: simulate the weather resistance of materials
constant temperature and humidity chamber: constant temperature and humidity testing machine is a necessary stable and reliable temperature and humidity testing equipment in the fields of electrical appliances, aviation, automobile, household appliances, coatings, chemical industry, scientific research and so on. It is used for the temperature and humidity environment test of high temperature, low temperature, cold resistance, damp heat or constant test of industrial parts, main accessories, semi-finished products, electrical, electronic and other product parts and materials
precision aging test chamber, UV aging test chamber (UV), high and low temperature test chamber,
high and low temperature impact test chamber:
cold and hot impact test machine is a necessary test equipment in the fields of electrical appliances, aviation, automobile, household appliances, coatings, chemical industry, national defense industry, military industry, scientific research and so on. It is suitable for optoelectronics, semiconductor industry, electronic related parts industry For the physical changes of parts and materials of other products such as automobile parts industry and computer related industry, test the repeated resistance of materials to high and low temperature and the chemical changes or physical damage of products produced by thermal expansion and cold contraction

high and low temperature alternating test chamber, xenon lamp climate resistance test chamber… Etc
thermal deformation and Vicat softening point temperature tester: suitable for testing Vicat softening point temperature and thermal deformation temperature of polymer materials
environmental testing according to the following standards:
technical conditions of GB11158 high temperature test chamber
technical conditions of gb10589-89 low temperature test chamber
technical conditions of gb10592-89 high and low temperature test chamber
technical conditions of GB /t10586-89 damp heat test chamber
GB /t2423 1-2001 low temperature test chamber test method
GB /t2423 2-2001 test method of high temperature test chamber
GB /t2423 3-93 test method of damp heat test chamber
GB /t2423 4-93 alternating damp heat test method
GB /t2423 22-2001 temperature change test method
iec60068-2-1.1990 low temperature test chamber test method
iec60068-2-2.1974 high temperature test chamber test method
GJB150 3 high temperature test
GJB150 4 low temperature test
GJB150 9 damp heat test

safety regulation testing instruments (flame retardant)
glow wire testing machine
glow wire testing machine is suitable for conducting fire hazard test and combustion performance test on Electrical and electronic products, household appliances and their materials, so as to simulate the ther
mal stress caused by heat sources or ignition sources such as glow elements or overload resistors in a short time under fault or overload conditions, It is used to evaluate the fire hazard of products. The equipment is designed and manufactured in accordance with the relevant provisions in the standards gb4706.1 and GB /t5169.10-2006
vertical water combustion testing machine
applicable standards: according to the requirements of gb5169, gb4943, GB /t2408-1996 and IEC standards
scope of application: it is used to measure the non combustion performance of plastics or films under the direct combustion of specified fire source. Standard sample specification: 125mm long, 13mm wide, 3 < 13mm thick (or according to the test standard); To judge the fire resistance rating of plastics (Hb, V and VMT)
American Standard: UL94

six environmental protection tests and ROHS test
RoHS is a mandatory standard formulated by EU legislation. Its full name is the directive of hazard on restricting the use of certain harmful components in electronic and electrical equipment. The standard has been officially implemented since July 1, 2006. It is mainly used to standardize the material and process standards of electronic and electrical products, so as to make it more conducive to human health and environmental protection. The standard aims to eliminate lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers in motor and electronic products, and focuses on the content of lead not exceeding 0.1%. The main sources of lead involved include the following categories
basic contents of EU RoHS and WEEE directives
RoHS directives restrict the use of the following six categories of hazardous substances
1 Examples of lead (PB) using this substance: solder, glass, PVC stabilizer
2 Mercury (Hg) (mercury) examples of using this substance: temperature controllers, sensors, switches and relays, bulbs
3 Examples of cadmium (CD) using this substance: switches, springs, connectors, housings and PCBs, contacts, batteries
4 Example of hexavalent chromium (Cr 6 +) using this substance: metal attached corrosion coating
5 Examples of polybrominated biphenyls (PBB) using this substance: flame retardant, PCB, connector, plastic shell
6 Examples of polybrominated diphenyl ether (PBDE) using this substance: flame retardant, PCB, connector, plastic shell

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