Boiled plating aluminum packaging material analysis and common problems

Boiled aluminized bag is mainly used in pickle, pickles, sauerkraut, pickles pickled food packaging, such as is common in sichuan, zhejiang and other areas. Boiled aluminized brand bags have wujiang river pickle, old dopted mother cabbages, etc. Boiled aluminized bag material: PET/INK/TVMPET/PE, BOPP/INK/TVMPET/PA/PE, BOPP/INK/TVMPET/PE, etc. , among them with BOPP/INK/TVMPET/PE application, most TVMPETSHI type 121 reinforced aluminum plating film, shading, high separation effect. Below small make up from boiled packing bags of aluminium coated material structure as the breakthrough point, analysis the process technology of boiled aluminium bags. A 1, BOPP printing material, printing process, its optimum printing, printing design exquisite, delicate, have qualitative feeling. Boiled aluminum plating film BOPP surface wet tension or 38 mn/m; Ink can better adhesion, while ensuring the composite strength. BOPP substrate in 100 ℃ boiled for 30 minutes, the longitudinal contraction allowed range + / - 1. 5%, transverse shrinkage allowed range + / - 0. 5%. Before and after thermal shrinkage of small, in the water disinfection, printing design will not be destroyed, to keep elegant appearance. Small heat shrinkage rate, can prevent pincer-like device sealing parts appear curly phenomenon. 2, printing ink, want to choose the neutral BOPP chlorinated polypropylene or polyester integration, printing ink, so on BOPP substrate more luster, at the same time, more uniform, flatness is better when printing ink. Neutral ink after boiled, won't appear in aluminized layer oxidation discoloration 2, TVMPET TVMPET blocking layer is aluminized film, it is play a role of a high separation, shading, prevent ink into the product. Selection of base material under the lights, viewed from different angles can't have the decorative pattern of laser, to ensure that all of the aluminum plating is real, no bubble. Better a shading, the action of high barrier, prevent ink infiltration. Its wetting tension 38 mn/m or more, at the same time to prevent low molecular content in the plating aluminum surface precipitation, on-line corona in front of the composite, is helpful to enhance the strength of composite. Three, PE heat sealing layer heat sealing surface wet tension of PE 42 or higher mn/m, in 100 ℃ boiled for 30 minutes, longitudinal thermal shrinkage in the plus or minus 1. Within 5%, the horizontal hot shrinkage in + 0. Within 5%, uniform thickness to at the same time, deviation within 5%. Before and after boiled, compound strength is high, bags to keep smooth appearance. And PE layer is in direct contact with the product film, so can't use just making good PE film, PE film to be placed more than 6 days. Need to online when corona clear smooth agent of PE, increase the intensity of composite. Also boiled aluminized layer PE bags should be anti-static, prevent products adhere to the liquid and powdered seasoning. Four, composite processing and processing of BOPP/INK/TVMPET/PE aluminum plating film, it is recommended to use a flux compound machining. In 100 ℃ water environment, the use of glue is doing composite flux, water-soluble glue can lead to a composite strength lower after boiled, environmental sanitation, not water soluble glue is not enough. Five, the common problems and solution 1, boiled, packet four corners or torn between PET and PE layer l PE layer thermal shrinkage is too big. Reduce the thermal shrinkage of PE film l heat sealing temperature is too high, PE large deformation. Appropriately raise a thermal pressure, reduce the heat sealing temperature l incision with silk, not smooth, punching mould is blunt. Change the cutting dies, sharp 2, packaging printing ink has bubbles l ink adhesion is low. Replace the ink too much l BOPP film flux residues. Adjust the drying equipment, ensure the drying residual flux l BOPP wet low tension. Corona treatment or replace the BOPP film l printing rubber roller mesh hole blockage or wear. Clean or replace rubber roller. 3, boiled aluminized layer after partial oxidation l pattern with a specific ink or corresponding aluminized layer oxidation. The corresponding ink contains aluminium oxide layer of material, change the ink. L aluminized layer on the edge of the bounding outside-in oxidation. BOPP thermal shrinkage is too big, after boiled, BOPP and aluminized layer separation, lead to oxidation. Replacement of BOPP film l bag body place with built-in objects are the part of the contact oxidation. Built in consequence of the permeability of the material, improve the barrier property of PE layer or increase the barrier layer. Aluminum plating color printing packaging labels: boiled aluminium bags
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