ROTO GRAVEUR MACHINE
For PP bags, the 8-color rotogravure process is almost exclusively used to print on BOPP (Biaxially Oriented Polypropylene) film, which is later laminated onto the woven PP fabric.
Tension Control
Machine use specialized load-cell tension systems to ensure the image doesn't distort across all 8 colors
Ink Adhesion
PP has low surface energy, machine often includes a Treater to increase the surface tension of the film, ensuring the ink doesn't peel off
Production and Delivery
Machine works very efficient speed and deliver its maximum productivity which is exceptional.
SOLVENT LESS LAMINATION
In the PP bag industry, solventless lamination is the “gold standard” for bonding the printed BOPP film to the Woven PP fabric.
Odorless Packaging
Because it uses no solvents, it is the preferred method for PP rice bags or pet food bags
Low Heat Profile
Solventless machine operate at lower temperature, preventing the PP fabric from shrinking or warping during the bonding process.
High Bond Strength
It provides a crystal-clear finish that makes the 8-color graphics "pop" while ensuring the bag can withstand heavy weights (25kg–50kg) without the layers delaminating.
XTRUDER LAMINATION
This machine is often referred to as a “PP Coating Machine” in the industry. It uses molten PP resin to “glue” the printed film to the woven fabric, or simply to provide a moisture-proof coating
Waterproofing
For industrial PP bags, the extrusion machine applies a thin layer of molten Polypropylene over the woven weave to make the bag sift-proof and moisture-resistant
Speed and Durability
This is the fastest way to laminate PP bags. The molten resin creates a structural bond that becomes part of the bag itself, making it nearly impossible to peel apart.
Cost Efficiency
For high-volume industrial bags, using molten PP resin is often more cost-effective than using specialized chemical adhesives