What is the difference between a pp bag and an opp bag?

Speaking of pp bags and opp bags, many people do not know what is the difference between them. Today, China Plastics Network - Jiuzhi Plastics Network's Xiaobian tells you about their differences, as follows:


What is the difference between a pp bag and an opp bag?

The pp bag is a plastic bag made of polypropylene. It is generally printed with color printing, offset printing, bright color, and usually made of woven bags. In addition, PP bag is a stretchable polypropylene plastic, which is a kind of thermoplastic. . It is non-toxic, tasteless and has a smooth and transparent surface. It is easy to burn. The flame condition is melted and dripped. It is yellow and blue. It is less smoke after fire. It is used for packaging of cosmetics, food, toys, clothing, stationery, electronics, hardware and other industries. The color is transparent, the quality is good, the toughness is good, because its hard and brittle material determines that it is only suitable for packaging and is not suitable for bearing.
Opp is a directionally stretchable polypropylene film. The opp bag has the characteristics of high transparency and brittleness. The OPP single piece is folded over and the side is edge-sealed and a self-adhesive seal is adhered to the open tongue. When used, the product is loaded into the product to peel off the surface of the seal. After protecting the skin, the tongue can be folded and folded, and it is easy to use and elegant. It is widely used in clothing, food, printing, stationery, cosmetics, paper and other industries.
The opp film has higher tensile strength, stiffness, transparency, gloss, printing performance and the like than ordinary pp film. Prices are naturally higher, and prices vary from product to specification. The sealing property of the OPP film is more than double that of the conventional film, so that the moisturizing and fresh-keeping properties of the OPP film are stronger and the preservation time is longer.

PVD Coating

PVD (physical vapor deposition) coating is a type of Surface Treatment that is used to improve the performance of metal parts, by applying a thin layer of material onto the substrate through a vacuum chamber. This process provides a range of benefits, including increased hardness, improved wear resistance, and enhanced corrosion resistance.


PVD coatings are typically applied to metals such as stainless steel, titanium, and aluminum. They are particularly useful in applications where the substrate is subjected to high wear and tear, as the coatings help to reduce friction and limit the damage caused by abrasion. They are also used in the automotive industry to provide an aesthetic and functional finish to exterior parts.


PVD coatings can be tailored to meet specific application requirements, with a range of coating materials available, including titanium, chromium, and zirconium. These coatings can be deposited in a range of colors, such as black, gold, and silver, giving designers and manufacturers the flexibility to create parts with the desired appearance.


Another key benefit of PVD coating is its durability. The thin layer of coating can offer a long-lasting, high-performance finish, even in harsh or corrosive environments. This makes them particularly useful in outdoor applications, and in settings such as aerospace and medical devices, where reliability and durability are critical.


PVD coating is applied through a series of steps, including cleaning and pre-treatment of the substrate, coating material deposition, and post-treatment, such as polishing or annealing. The result is a thin, uniform layer of coating that provides a range of functional and aesthetic benefits.


In conclusion, PVD coating is a versatile and effective surface treatment for metal parts. It offers a range of benefits, including improved hardness, wear resistance, and corrosion resistance, as well as aesthetic options. By enhancing the performance and durability of metal parts, PVD coating plays an important role in improving the reliability and efficiency of a range of industries and applications.

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