How to use Raman spectroscopy technology to identify new plastics or recycled plastics?

Plastics bags used to pack hot food has gradually grown poplularity in daily life, do you concern plastic bag made of new plastic or recycled plastic? Most citizen neglect harms caused by recycled plastics.

How much harm do recycled plastic products can human body after all?

Plastic food bags made of recycled materials are mainly made of polyvinyl chloride (PVC), is a toxic chemical raw material, if it encounters acid and oily substances, toxic ingredients will be free to come out, such as adjustable liangpi and put hot pepper oil, the oil and vinegar in contact with food bag, food bag in which soak out the poisonous and harmful ingredients, in addition, these packs containing polyvinyl chloride (PVC) in high temperature can release harmful material such as chlorine, especially just out of the pan Fried dough sticks, and hot porridge, pasta, with the increasing of temperature, more harmful substances in the food bag, easy to be absorbed by the food into the predator internal, Long-term use can easily lead to chronic food poisoning and central nervous diseases, especially on the healthy development of children. 

And unqualified food bag contains the germ that exceeds limit seriously and carcinogen, the cooked food that USES this kind of food bag to pack to enter directly, cause very serious consequence to consumer's health. In order to prevent consumers from using recycled plastics to harm drug, food safety and quality, how to quickly and effectively identify recycled plastics has become the focus of effective control by regulatory authorities.

At present, there is no good method for the identification of recycled materials. Gas chromatography-mass spectrometry (GC-MS) was used for determination. The correlation between test results and recycled materials is not intuitive nor targeted. Raman spectroscopy is widely used in polymer research because it can realize nondestructive and rapid detection. The doping of polyethylene and polypropylene new materials was analyzed by Raman spectrometer.

The peak shape and peak height of new and old materials are different due to the difference of crystallinity and polymerization degree. This difference helps to identify whether the material is mixed with reprocessed material.