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② Black spot granule
In addition to black particles, black or dark brown spot particles can be visually visible.
③ Color particles color granule
Particles with other colors except for the colors that the resin should have.
④ Large grain large granule
sieve remaining particles with a size greater than 5mm, as well as various continuous particles and slender particles that are adhered to by two or more particles.
⑤ Small granule
Sieve remaining particles with a size less than 2mm, including debris and fragments.
⑥ Snakeskin granule
The ribbon-shaped resin that resembles snakeskin.
⑦ tailing granule
particles with cone angles or burrs caused by poor granule cutting.
⑧ Floccule
cotton floccule, filamentous or ribbon resin with a certain width.
⑨ Bubble particles foam granule
Visually containing particles, excluding the shrinkage holes of the particles themselves.
b) ash
ash, which is an important indicator for the qualification of thermoplastic products. Ash is also called burning residue, which refers to the residues of oxides and salts formed by its mineral components after evaporation and burning, and is expressed as percentage content.
If the ash content is not controlled properly, it can easily cause clogging of the production equipment and will also affect the performance of the product's mechanical strength and other properties.
c)Density
density sample was taken from injection molding samples and tested according to GB/T 1033.1. The arbitration method is impregnation method. The density deviation is the difference between the test value and the nominal value.
d) Melt mass flow rate (MFR)
melt mass flow rate (MFR) and melt volume flow rate (MVR) refer to the mass or volume of the melt passing through the standard mold every 10 minutes under a certain temperature and load. It is mainly used to describe the strength of the material's fluidity in injection molding, wire drawing, etc.
is tested according to the provisions in GB/T 3682.1. The test conditions were 230℃ and the load was 2.16kg. Three samples were taken for testing, and the average value was reported
, as the melt mass flow rate of the sample. According to formula (1), the standard deviation of MFR is calculated. SMER
e) Tensile strength
Polypropylene has high tensile strength and good bending resistance. It is called "one-folded glue". To exaggerately, the bend is not white when bent for 1 million times. Tensile strength is an important basic indicator of polypropylene.
regenerated polypropylene test is carried out in accordance with GB/T 1040.2, with a test speed of 50mm/min.
f) Odor
regenerated polypropylene odor grade should be combined with the requirements of 5.3 in GB/T 40006.1-2021: Odor should be given priority to meet the relevant application fields or their corresponding material standards. If there is no relevant requirement, it should be less than or equal to level 4.
odor grade is divided into 1~6:
odorless;
odor, but no interference, irritating odor;
There is obvious odor, but no interference, irritating odor;
There is interference, irritating odor;
There is strong interference, irritating odor;
odor There is an unbearable smell.
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Type inspection
Type inspection should be carried out when the following situations are present:
a) New product trial formulation and identification;
b) After the official production of , if there are major changes in the raw materials or process, it may affect When the product performance is performed,
c) product equipment maintenance and production is resumed;
d) factory inspection results are significantly different from the last type inspection results;
e) first imported products or continuous production for 12 months;
f) other situations that require imported type inspection.
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Participate in the training
At the time of the formal implementation of the regeneration PP standard, the National Plastic Standardization Technical Committee (TC15), sponsored by the National Plastic Standardization Technical Committee (TC15), and hosted by the National Plastics Standardization Technology Committee (TC15), and hosted by the new observation of Waste Plastics , will be held from May 24 to 27, 2022. Please pay attention to and study! The training will invite main author of the national standards for regeneration series to explain the key points of the entire series of standards in detail.
View original text: Will the implementation of the national standard be a "new trend" for high-value applications of recycled plastics? Please follow the WeChat official account " Regeneration PP New Vision "!
