In the previous part, we have learn about definitions and common features of BOPP bags. Today, let’s find out more about characteristics and graphic printing on BOPP bags.
As we all know, BOPP film a thermoplastic polymer film of polypropylene with an orderly molecular structure formed by the biaxial orientation process. This process improves the optical and gas barrier properties of the film. With excellent clarity, high tensile and impact strength, good dimensional stability and flatness, low electrostatic charge, corona treatment on one or both sides, waterproof and moisture repellant, excellent transparency, lower density, gas and moisture barrier properties, and is recyclable, Bopp film can be used as a substitute for cellophane, PVC, IPP, CPP, PE and other plastic films for enhancing product functions and thus prove to be highly cost-efficient.
Characteristics and graphic printing of BOPP bags.
Characteristics of BOPP bags
- Waterproof and moisture barrier properties.
- Very high quality printing that cannot be scratched off.
- High tensile strength, good dimensional stability and flatness.
- Low electrostatic charge.
- High gloss surface enhances marketability of the product.
- Enhanced marketability of the product – especially important when competing for shelf space.
- Fewer layers, reducing weight and freight cost.
Specifications of BOPP bags
+ Width range from 14″ to 24″ (360 mm to 600 mm).
+ Outer layer: BOPP film with up to 8 color (full colors) printing capability.
+ Middle layer: PE coating 0.8 mil to 1.2 mil thickness.
+ Inner layer: PP woven fabric, 10×10 weave and 800 to 1000 denier.
+ Printed on one side, two sides, and/or gussets.
+ Construction features include gussets or non-gussets, valve, E-Z open, tape seal.
+ UV-treated materials optional
+ Rigid handle addition available
BOPP printing graphics.
The printing surface of the bag is ultra-clear BOPP film, which adds another layer of product protection, but also is very smooth and an excellent graphics “carrier,” allowing for the brightest and sharpest images. For the first time in packaging for products like seeds and animal feeds, you have the best of both worlds: a structur-ally strong package and great graphics. With traditional multiwall paper bags durability must be compromised for the sake of graphics; that is not an issue with BOPP packaging.
The printing is done on the backside of the film, that is, “reverse” printed. When you look at the bag graphics, then, you are looking through a the film barrier, like peering through a window. That maintains the integrity of the graphics, no matter how minute or detailed, because someone or something would have to penetrate the film to get to the print, as opposed to hands or machines scratching or rubbing off the ink as can occur when the print sits on top of paper. The barrier also protects against environmental substances, like grease, water and oils, as well as to guard the integrity of the product nutrients.
In the next part, let’s learn about the use of BOPP bags.
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