The choice of nut packaging material affects both quality and freshness preservation: high-fat nuts are suitable for oil-resistant KPET/PE, while hard-shelled nuts require puncture-resistant materials. Vacuum bags lock in freshness and maintain crispness, nitrogen-filled packaging prevents oxidation and breakage, and composite bags offer flexibility to meet diverse needs.
1. Choosing Nut Packaging Materials
Common nut packaging materials include kraft paper, aluminum, low-density polyethylene (LDPE), paper, VMPET (aluminum-coated film), polyethylene (PE), and OPP (polypropylene). When selecting, choose the appropriate material combination based on the characteristics and needs of the nuts. For example, for nuts with a high fat content, KPET/PE with good oil resistance and barrier properties can be selected; for nuts with hard shells, a puncture-resistant material should be selected to ensure packaging stability.
2. Nut Packaging Bag Types
◇ Composite Nut Packaging Bags
Compound nut packaging bags are an ideal choice for bulk nuts. This type of flexible packaging comes in a variety of materials, including paper bags, plastic bags, and aluminum foil bags. By combining these materials, bags can be created to meet various food packaging requirements, such as barrier properties, puncture resistance, and oil resistance. Furthermore, these bags are available in a wide variety of shapes, including three-side seal, four-side seal, eight-side seal, and custom-shaped bags, flexibly meeting the packaging needs of various nuts.
◇ Vacuum Nut Packaging Bags
Vacuum nut packaging bags are another common option. Using vacuum technology, these bags effectively prevent the loss of nut flavor and oil deterioration. Their excellent aroma and crispness retention properties help extend the shelf life of nuts.
◇ Air-filled Nut Packaging Bags
Similar to air-filled bags used for puffed foods, air-filled nut packaging is also gradually being introduced. By filling the bag with nitrogen, these air-filled nut packaging bags effectively block out external air, preventing oxidation and deterioration of the nuts. Furthermore, they prevent the nuts from being crushed or broken during transportation, ensuring their integrity and quality.
