FAQ's

Virgin Resin (VR) grade Cast Polypropylene (CPP) film materials entail no reprocessed material other than edge trim produced in the extrusion process. Standard grade (S) CPP film materials include varying levels of regrinding and repro depending upon the specific film product. A VR grade CPP will tend to have a lower gel count than an S grade CPP and may be more suitable for gel-sensitive lamination applications. The regrind and repro materials used in KPL S grade CPP film products are only generated internally within the manufacturing process. They are fully compatible with the prime resin materials used to produce the film. Besides higher natural gel count, S-grade CPP film materials have kindred mechanical and optical virtue like that of VR-grade CPP films. Both VR and S-grade CPP film materials are fit for food packaging applications.

Quality is fundamental to Kanpur Plastipack Ltd. as we possess an in house Quality Assurance system of auditing performance and ensuring that you are supplied products according to your customisations and specifications.

As a consensus, surface energy levels achievable with conventional corona discharge surface treatment are limited to less than 38 dynes. Water-based inks and adhesives typically need surface energy levels of more than 42 dynes to meet performance expectations. If you aim to use water-based inks and adhesions with a CPP, in-line post-treatment will be a necessity. Even in this situation, proper wetting and curing of inks and adhesives may not fructify. It is advised to use solvent-based inks and adhesives with a CPP for auspicious results.

In technical terminology, the Glass Transition Temperature (the temperature at which a material's mechanical properties start to behave like glass) for standard polypropylene-based film materials is approximately 38 degrees F (3 C). Underneath this temperature, polypropylene films lose their effect strength and may fail mechanically whenever exposed to extreme handling. In this manner, CPP in a mono-film structure isn't suggested for bundling applications where the temperature in ambiance could decrease under 38 degrees F.

Besides, specific films can deal with lower temperatures and we do have low-temperature friendly films either the RP423B or RP423BX.

In analogy with most Polyethylene (PE) based film materials, CPP has significantly greater barrier properties for gases and dampness. Contingent upon the product being packaged and factors impacting freshness and shelf life, CPP may offer improvements. Although when compared with Oriented Polypropylenes (BOPP) and polyesters (PET), the barrier properties of CPP are significantly lower.

Specific monolayer and coextruded CPP film materials can be metalized quite easily. It is pivotal that the film surface to be imparted with the metal coating does not contain any foreign additives that might meddle with proper metal adhesion. The barrier properties of a metalized CPP are 50 to 100 times that of a clear CPP.

Unfortunately, there is no no-brainer solution to this inquiry. Each kind of film material will have remarkable attributes itself. Seal Initiation Temperature (S.I.T.), ΔT (the contrast between S.I.T. furthermore, melting Temperature), modulus (firmness), and flexibility to give some examples are qualities that can influence execution on changing over and packaging machines. Generally, both monolayer and multi-layer co-extruded CPP film materials perform well on a wide assortment of converting and packaging machines. Although, changes might be made in seal bar design and working temperature, dwell, pressure, strain control, and so on to accomplish ideal performance.