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Raw material selection for environmentally friendly heat shrink film

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    Raw material selection for environmentally friendly heat shrink film

    2024-06-26

    Eco-friendly heat shrink film, as a new type of green packaging material, is being favored by more and more enterprises and consumers.
    Plastic packaging materials are widely used in various fields due to their lightweight, durability and cost-effectiveness. However, the ensuing environmental problems are becoming more and more prominent, especially the long-term impact of plastic waste on the ecosystem. Therefore, the development of environmentally friendly heat shrink films and the use of biodegradable or recyclable raw materials have become important developments in the packaging materials industry.

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    Bio-based Polymers
    Bio-based polymers are polymers extracted from renewable resources that are biodegradable and are the raw materials of choice for environmentally friendly heat shrink films.
    Polylactic acid (PLA): polymerized from lactic acid obtained from corn starch or sugarcane fermentation, it has good transparency and mechanical properties, and is suitable for packaging of food and daily necessities.
    Polyhydroxy fatty acid ester (PHA): a natural polymer material synthesized by microorganisms, with excellent biodegradability and biocompatibility.
    Biodegradable Synthetic Polymers
    In addition to bio-based polymers, there are some synthetic polymers with good degradation properties that are suitable for heat shrink film production.

    Polyesters: such as polybutylene succinate (PBS) and polybutylene terephthalate (PBAT), which are fully degradable under industrial composting conditions.
    Polycarbonates: Certain types of polycarbonates are biodegradable under certain conditions and are suitable for use in heat shrink films.
    Natural Polymers
    Natural polymeric materials, such as starch, cellulose and proteins, are also an important source of raw materials for environmentally friendly heat shrink films.

    Starch-based materials: modified by chemical or physical methods to improve their thermal stability and mechanical properties, they can be used in the production of heat shrink films.
    Cellulose: with excellent mechanical strength and barrier properties, its thermoplasticity can be improved through chemical modification.
    Modification and blending technology
    In order to improve the performance of environmental protection heat shrinkable film, it is often necessary to modify the above raw materials or blended with other materials.

    Chemical modification: improve the thermal stability and processing performance of natural polymer materials through grafting, crosslinking and other methods.
    Physical blending: Blending different materials, such as blending bio-based polymers with synthetic polymers, to balance cost and performance.
    Environmental assessment of raw materials
    When selecting raw materials, a comprehensive consideration needs to be given to their biodegradability, the sustainability of the source, the environmental impact of the production process, and how the final product will be recycled and disposed of.
    Life Cycle Assessment (LCA): Evaluates the environmental impact of a feedstock over its entire life cycle, from production to disposal.
    Biodegradability testing: ensures that the selected feedstock can be broken down by microorganisms under specific conditions.