Our packaging materials are microperforated using a CO2 laser. Laser perforation creates a clean, well-defined hole in the film. Compare this to mechanical cold needle perforations or 1/4" vent holes used by many packaging suppliers. Cold needle mechanical methods produce inconsistent hole size which causes inconsistent gas transmission. Vent holes provide no atmosphere control.
Unlike holes created with mechanical cold needles and vent hole perforations, laser microperforated holes can be easily measured because they are consistent and reproducible. This allows us to customize the packaging for your specific fresh produce items by varying hole size and number which creates the desired O2 flux rate.
Dr. Elizabeth Varriano Marston, owner of Windham Packaging LLC, holds patents on Registered Laser Microperforation (see US Patents 6,441,340 and 6,730,874 and 7,083,837 for creating O2 flux rate-specific packaging for MAP of produce). We license this patented technology to plastic converters throughout the United States.
Unlike other laser microperforated films, we register the perforations in distinct identifiable area so the processor can easily verify their presence. In addition, our microperforations are positioned to avoid occlusion of the breathable areas during pack-out, storage and transport.
Our modified atmosphere packages for fresh produce is customized by varying microperforation size and number, taking into consideration respiration rate, package weight, volume, and anticipated distribution temperatures. Proper selection and placement of microperforations encourages development of an optimum atmosphere inside the package, controlling oxygen, carbon dioxide, and moisture levels to extend product life.