Description of the innovation:
FLEXSEAL HSL OGR coating is solvent free aqueous dispersions specially designed as oil and grease resistant heat sealable coating for kraft paper applications. This product offers good oil and grease resistance and excellent heat seal-ability for kraft paper applications. This coating is primarily applied via rotogravure application process.
Food and food service packages using paper often require enhanced barrier properties, like barriers against oil & grease. Additionally, many paper packages stock, for example, kraft paper stock for food also require the paper to be heat sealable making it possible to form pouch required in food and food service packages.
Commonly to achieve oil and grease resistance to paper, Fluorochemicals based barrier coatings are used for wrappings and pouches prepared therefrom particularly such products used in contact with food. But, Fluorochemicals are perceived as toxic and a health hazard and in some instances are additionally objectionable because they create odour or flavour changes in the food product.
Additionally, Polyethylene (PE) extrusion coated paper still dominates in such applications by providing both required barrier and heat seal properties. PE extrusion coated paper and paperboard have difficulties in repulping and are not as easily recyclable as conventional paper, creating problems in recovering the useful fibers from the packages and causing environmental concerns if these packages go to landfill. There are increasing demands for alternative solutions including coating technologies to replace paper & paperboard packages that contain a PE coating or film layer as a result, material substitutes for polyethylene liners are emerging to solve the problem of repulpability of paper after use.
Repulpable and recyclable aqueous coatings are one of the promising solutions to address this need. However, most aqueous coatings still cannot meet the requirements compared to PE extrusion coated paper/paper board for various reasons, including good seal strength, fast sealing speed, good roll block resistance, providing an adequate barrier to water, oil, grease. Balancing all these required properties is difficult, as they can be contradictory to one another. Keeping in mind the above demand FLEXSEAL HSL OGR coating has been developed by Uflex Chemicals as a replacement of PE coating from inner lining of paper-based packaging. The invention of FLEXSEAL HSL OGR operates to absorb the oil and/or grease and to provide a tortuous path to their migration through the coating to reduce or eliminate their penetration into the paper or paperboard substrate onto which they have been applied. This coating is environmentally friendly and direct food contact compliance certified. FLEXSEAL HSL OGR coating and primarily used on different types of kraft papers.
Fig.1: FLEXSEAL HSL OGR Water base coating for kraft paper applications.

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