A safe and environmentally friendly easy-peel film for packaging

Currently, the easy peel films used in co-extruded packaging mainly use polyethylene film layers as the heat sealing layer, with a soft aluminum foil layer laminated on the polyethylene film layer or PVC rigid sheet as the base layer, but its drawback is the direct use of polyethylene as the heat sealing layer. After the two layers of this composite film are heat sealed together, the adhesion between the polyethylene heat sealing layers is too strong, making it impossible to peel apart; they can only be torn open, which is inconvenient to use and difficult to control the peel force. When the surface is exposed, it is prone to drawing, burrs, and roughness, causing the heat sealing layer material of the packaging film to fall into or be absorbed by the packaging material, which negatively affects the consumer's product experience.

To overcome the shortcomings of the existing technology points , a safe and environmentally friendly easy peel film is provided, which has a smooth sealing surface after peeling, excellent peelability, meets various packaging performance requirements, and improves consumer convenience and safety, along with its manufacturing method. To achieve the above objectives, this technical solution is to design an easy peel film for packaging, including a base layer and a heat sealing layer, which are laminated together by a polyurethane adhesive layer; the heat sealing layer is a three-layer co-extruded polyethylene film, including an outer layer in contact with the base layer, a middle layer, and an inner layer; the inner layer is composed of a mixture of low-density polyethylene, linear low-density polyethylene, silicon material, and lubricant. In PE material, adding silicon material can firstly reduce PE the viscosity of the film, making the heat-sealed composite film easier to peel; secondly, when the heat-sealed films containing silicon material adhere to each other, PE it is PE adhesion between materials, adhesion between silicon materials, PE and adhesion with silicon material; silicon has a very high melting point. During the co-extrusion production of the heat sealing layer, silicon remains solid, and the inner layer of the heat sealing layer has a certain roughness. When peeling, due to the roughness of the heat sealing contact surface, the instability of silicon crystals, and the lubrication effect between silicon particles, solid silicon easily separates from PE or silicon particles separate into flakes, or silicon particles separate due to a small angle of repose. To ensure the heat sealing layer has good transparency, tensile properties, friction coefficient, and surface tension. Lubricant is oleamide and / or erucamide, Lubricant the amount of lubricant added is 1%-2% of the combined weight of low-density polyethylene and linear low-density polyethylene. 1%-2% Oleamide and erucamide, as essential chemical additives in the film, can improve PE the film's antistatic properties and lubricity, enhance moisture resistance, significantly reduce friction coefficient and anti-blocking properties, PE significantly improve the efficiency during blown film extrusion, ( effectively prevent film-to-film adhesion and particle agglomeration, increase the smoothness of the film surface, prevent dust accumulation on the product surface, and produce very smooth plastic products. ) The above-mentioned

easy peel film for packaging has the advantages and beneficial effects of: Using a blend of polyethylene and silicon material as the inner layer material of the heat sealing layer, when the inner layers are overlapped and heat sealed into a film, the two heat sealing layers have appropriate adhesion, can contain items, are easy to peel, convenient to use, and have the advantages of good transparency, good softness, and reliable sealing performance; at the same time, it also has a clean peeling effect, with peel marks only remaining on the heat sealing layer, so the peeled surface is very clean without burr marks, avoiding contamination of medicines or medical devices; using aluminum foil as the base layer solves the curling problem of nylon as a base layer. this has the advantages and beneficial effects of: 采用聚乙烯和硅物质的共混物作为热封层的内层材料，当内层重叠热封成膜后，两层热封层具有适当的粘合度，可以容纳物品，容易揭盖，使用方便，具有透明性好、柔软性好、密封性能可靠的优点；同时还具有清洁剥离的效果，剥离痕迹只会停留在热封层上，所以剥离表面非常干净，不留毛刺痕迹，避免污染药品或医疗器械；采用铝箔作为基材层，解决了尼龙作为基材的卷曲问题。