The aluminum foil layer of aluminum foil tissue paper is a core functional component, and its puncture resistance directly affects the product's applicability and durability. In diverse usage scenarios, the aluminum foil layer must simultaneously withstand internal tissue friction, external sharp object impacts, and environmental stress. This requires its puncture resistance design to consider material properties, structural optimization, and process control. The following analysis focuses on three dimensions: material selection, composite structure, and process control.
The purity of the aluminum foil layer and its processing technology are fundamental to its puncture resistance. High-purity aluminum foil (purity ≥99.5%) has a dense grain structure, reducing stress concentration caused by microscopic defects and thus lowering the risk of puncture. During processing, cold rolling is necessary to control the uniformity of aluminum foil thickness, avoiding localized thinning that creates weak points. For example, multi-pass cold rolling technology can gradually refine the aluminum foil grains, improving its ductility and tear resistance. Furthermore, the aluminum foil surface can be passivated to form a dense oxide film, which enhances corrosion resistance and improves scratch resistance through surface hardening, indirectly reducing the risk of puncture.
The design of the composite structure is key to improving the puncture resistance of aluminum foil layers. Aluminum foil tissue paper typically employs a multi-layered composite structure with aluminum foil, plastic film, paper, etc., where the aluminum foil acts as a barrier layer and needs to work synergistically with other materials. For example, when aluminum foil is laminated with polyethylene (PE) film, the PE layer can absorb some impact energy, reducing the direct stress on the aluminum foil; if a nylon (NY) layer is added, its high strength properties can further disperse stress, preventing the aluminum foil from being punctured by sharp objects. The interlayer adhesion strength of the composite structure is equally important, requiring co-extrusion lamination or adhesives to achieve a strong bond and prevent interlayer peeling, which would reduce puncture resistance.
Process control directly affects the final performance of the aluminum foil layer. During the lamination process, temperature and pressure parameters must be precisely controlled to ensure full adhesion between the aluminum foil and the substrate. Excessive temperature may cause aluminum foil oxidation or substrate deformation, while insufficient temperature will affect adhesion strength; insufficient pressure will cause bubbles or white spots, while excessive pressure may puncture the aluminum foil. Furthermore, the uniformity of the coating process is also crucial; the adhesive or coating must completely cover the aluminum foil surface, filling micropores and forming a continuous protective layer. For example, slot coating technology can achieve uniform adhesive distribution, avoiding the risk of punctures caused by insufficient adhesive in certain areas.
Optimizing the thickness of the aluminum foil layer requires balancing puncture resistance and cost. Increasing the aluminum foil thickness improves puncture resistance but increases material costs and reduces flexibility, affecting the smoothness of tissue dispensing. Therefore, a reasonable thickness range needs to be determined based on the usage scenario. For example, for daily household use, a thinner aluminum foil (7-12μm) can be chosen to reduce costs; for industrial or outdoor scenarios, a thicker aluminum foil (15-25μm) is required to enhance durability. Simultaneously, localized thickening designs can be used to increase the aluminum foil thickness in puncture-prone areas (such as the tissue dispenser), achieving a balance between performance and cost.
Surface treatment technologies can further improve the puncture resistance of the aluminum foil layer. For example, embossing processes can create micro-protrusions on the aluminum foil surface, increasing the contact area and dispersing puncture stress; or coating technologies can be used to coat the aluminum foil surface with abrasion-resistant resin, forming a hard protective layer. These treatments must balance flexibility and puncture resistance to prevent the aluminum foil from becoming brittle due to surface hardening. Furthermore, rounded edges reduce cutting damage and lower the risk of punctures caused by sharp edges during use.
Environmental adaptability design is a crucial complement to the puncture resistance of the aluminum foil layer. When used in humid or high-temperature environments, the aluminum foil may absorb moisture or soften, leading to a decrease in puncture resistance. Therefore, environmental stability needs to be improved through material modification or structural optimization. For example, using an aluminized film instead of pure aluminum foil can reduce the risk of moisture absorption; or adding a barrier layer can prevent moisture from penetrating into the aluminum foil layer. Simultaneously, the shrinkage rates of the aluminum foil and the substrate must be matched to avoid stress concentration between layers due to temperature changes, which could lead to punctures.
Improving the puncture resistance of the aluminum foil layer in aluminum foil tissue paper requires comprehensive design from multiple dimensions, including materials, structure, process, thickness, surface treatment, and environmental adaptability. By selecting high-purity aluminum foil, optimizing the composite structure, controlling process parameters, balancing thickness and cost, applying surface treatment technology, and enhancing environmental adaptability, the puncture resistance of aluminum foil layers can be significantly improved to meet the needs of diverse application scenarios.
