The history of plastics can be traced back to the mid-19th century，At that time, the British textile industry developed rapidly，In order to meet the rapid development of textile industry needs，Chemists are working on developing dyes and bleaches。In the process，Chemists discover synthetic materials can change shape under heat and pressure，Keep shape after cooling。
Compared to rare and expensive natural materials，Such as rubber、Glass and amber, etc.，Better meet diversified production needs。With this inspiration，Plastic was invented at the beginning of the next century。Until now，Plastics can be seen everywhere in life。
Plastics are synthetic polymer materials，Relative to metal、Other materials such as wood have the advantages of low cost and strong plasticity，Therefore, it is more widely used in product packaging。
The main plastic ingredients used in commercial packaging on the market are 7 kind：Ethylene phthalate、High density polyethylene、Polyvinyl chloride、Low-density polyethylene、Polypropylene、Polystyrene and polycarbonate。
Ethylene phthalate
PET mineral water bottle、Carbonate、Common materials for outer packaging of products such as juice beverage bottles and soy sauce vinegar bottles。
High density polyethylene
HDPE is often made into composite film packaging with other plastics。
Polyvinyl chloride
PVC is often used in industrial products、On the outer packaging of daily necessities, etc.。
Low-density polyethylene
LDPE is mainly used to produce plastic wrap and plastic bags for food。
Polypropylene
PP is often used in the production of plastic containers and plastic packaging films.。
Polystyrene
PS is mainly processed into films and foam plastics。
Polycarbonate
PCs are often used in packaging daily consumer goods and luggage。
The principle of laser flight marking technology to identify plastic packagingRecombining the surface of the material or changing the surface color of the material，Marking effects include：Bubble、Carving sinking、Color changes。
Bubble
When the laser energy is low enough to cause the material to carbonize，Laser only causes certain components of the material to decompose into bubbles，The bubbles and material colors are only slightly colored，Finally, the light colored logo is left on the material。
Carving sinking
When the energy of the laser is high or the melting point of the material is low，Laser can corrode or vaporize the material to form a sink。
Color changes
Short enough laser wavelength radiation，It will dissociate the plastic molecules and cause the color change of the plastic，This is the most ideal situation in laser marking。
Laser flight marking technologyIt is a flexible way to identify，It can be adapted to be marked in a variety of ways on various types of plastic products。Traditional thermal transfer、Ink and other identification methods are prone to blur and wear of the identification content，It may even cause corrosion and fall off of surface materials。During production，Traditional production methods such as ink，It is easy to cause air pollution and endanger the personal health of staff。Laser flight marking technology can solve the above problems well。