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CN-121989535-A - Labyrinth exhausting re-packing bag coiled material and production process thereof

CN121989535ACN 121989535 ACN121989535 ACN 121989535ACN-121989535-A

Abstract

The invention discloses a labyrinth exhausting re-packaging bag coiled material and a production process thereof, belonging to the technical field of packaging materials, and sequentially comprising a printing protection layer, a reinforcing framework layer, a blocking adhesive layer and a heat sealing layer from outside to inside; the manufacturing process comprises the steps of S1, guiding a reinforced framework layer into a first compounding unit, then compounding and cooling a printing protection layer outside the reinforced framework layer in an extrusion coating mode to obtain a first semi-finished product, S2, guiding the first semi-finished product into a second compounding unit, carrying out double-layer coextrusion tape casting on a barrier adhesive layer and a heat seal layer to one side of a polyester spun-bonded non-woven fabric of the reinforced framework layer, laminating and cooling to obtain a second semi-finished product, S3, carrying out corona treatment on the outer surface of the second semi-finished product, and then carrying out traction, slitting and rolling to obtain the labyrinth exhaust re-packaging bag coiled material.

Inventors

  • HUANG LIANG
  • HU JICHAO
  • FANG WEIMIN
  • YU ZHOU
  • WANG HAIBIN

Assignees

  • 黄山源点新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (10)

  1. 1. The labyrinth exhausting re-packing bag coiled material is characterized by comprising, from outside to inside, 15-30 mu m of a printing protection layer, 80-120 mu m of a reinforcing framework layer, 25-45 mu m of a barrier adhesive layer and 40-60 mu m of a heat sealing layer in sequence; The reinforced framework layer is formed by compounding BOPP woven cloth and polyester spun-bonded non-woven cloth in a hot melt bonding mode; The barrier adhesive layer is formed by melt mixing an ethylene-vinyl alcohol copolymer, high-density polyethylene, a modified nano compound and a compatilizer according to the mass ratio of 20-40:30-50:15-30:5-10, wherein the ethylene content of the ethylene-vinyl alcohol copolymer is 32mol%, the melt index of the high-density polyethylene is 0.5-2.0g/10min, and the compatilizer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer; The heat sealing layer is formed by melting and mixing metallocene linear low-density polyethylene, high-melt-strength polypropylene, ultra-low-density polyethylene and antistatic agent according to the mass ratio of 40-60:20-30:15-25:3-8.
  2. 2. The labyrinth-exhaust re-packaging bag coiled material according to claim 1, wherein the printing protection layer is formed by melt mixing of polypropylene homopolymer, ultraviolet-resistant master batch, a slipping agent and a toughening agent according to the mass ratio of 60-80:5-10:2-5:5-15, wherein the slipping agent is formed by compounding erucamide and silicon dioxide according to the mass ratio of equal, and the toughening agent is a maleic anhydride grafted ethylene-octene copolymer.
  3. 3. The labyrinthine vent repackaging bag coil as described in claim 1, wherein said reinforcing carcass layer is made by the following process: Uniformly spreading EVA hot melt adhesive powder on one side surface of BOPP woven cloth according to 8g/m 2 , covering with polyester spun-bonded non-woven fabric, and hot-pressing with a heating pair roller at 110-130deg.C to obtain the reinforced skeleton layer.
  4. 4. The labyrinthine vent repackaging bag coil as set forth in claim 1, wherein said BOPP knitted fabric has a warp and weft density of 10 x 10-14 x 14 pieces/inch, a denier per filament of 800-1200 denier, and said polyester spunbonded nonwoven fabric has a grammage of 15-25g/m 2 .
  5. 5. A labyrinthine vent repackaging bag coil as described in claim 1, wherein said modified nanocomposite is prepared by the process of: a1, adding the halloysite nanotubes subjected to vacuum drying and KH-550 into an ethanol water solution, uniformly dispersing by ultrasonic waves, carrying out suction filtration, washing by using ethanol, and carrying out vacuum drying to obtain modified halloysite nanotubes; And A2, melting and blending the modified halloysite nanotube, maleic anhydride grafted polyethylene and polyamide 6 in a double-screw extruder, extruding and granulating to obtain the modified nanocomposite.
  6. 6. The labyrinth air-exhausting re-packaging bag coiled material according to claim 5, wherein the mass ratio of the halloysite nanotubes to KH-550 to the ethanol aqueous solution is 50:3-4:300, the average length of the halloysite nanotubes is 1-2 μm, the diameter of the halloysite nanotubes is 50-100nm, and the concentration of the ethanol aqueous solution is 95wt%.
  7. 7. The labyrinth-vent re-bagging web as claimed in claim 5, wherein the mass ratio of the modified halloysite nanotubes, the maleic anhydride grafted polyethylene and the polyamide 6 is 3:5-6:3-4.
  8. 8. The process for producing a labyrinthine vent repackaging bag coil as described in claim 1, comprising the steps of: S1, unreeling the reinforced framework layer and guiding the reinforced framework layer into a first compounding unit, adding a raw material for printing a protective layer into a first extruder for melting and plasticizing, directly extruding and coating a melt on one side of a BOPP woven cloth of the reinforced framework layer through a T-shaped die, and compounding and cooling through an extrusion cooling roller to obtain a first semi-finished product; S2, guiding the first semi-finished product into a second composite unit, respectively adding the raw materials of the barrier adhesive layer and the raw materials of the heat sealing layer into a second extruder and a third extruder for melting plasticization, simultaneously extruding through a double-layer co-extrusion die head, casting to one side of the polyester spun-bonded non-woven fabric of the reinforced framework layer, and pressing and cooling through a pair of composite press rolls to obtain a second semi-finished product; s3, carrying out corona treatment on the surface of the printing protection layer of the second semi-finished product under the strength of 38-42dyn/cm, and then carrying out traction, slitting and rolling to obtain the labyrinth exhaust re-bagging coiled material.
  9. 9. The process for producing a labyrinthine vent repackaging bag coil as described in claim 8, wherein said T-die has a temperature of 200-220 ℃ and said extrusion cooling roll has a temperature of 20-40 ℃.
  10. 10. The process for producing a labyrinthine vent repackaging bag coil as described in claim 8, wherein said barrier adhesive layer has an extrusion temperature of 210-230 ℃, said heat seal layer has an extrusion temperature of 180-200 ℃, and a chill roll temperature in the composite press roll is 25-45 ℃.

Description

Labyrinth exhausting re-packing bag coiled material and production process thereof Technical Field The invention belongs to the technical field of packaging materials, and particularly relates to a labyrinth exhaust re-packaging bag coiled material and a production process thereof. Background The re-bag is widely applied to the powder and granular material package in the industries of chemical industry, building materials, food, mineral products and the like. Wherein, when the labyrinth exhausting re-packing bag is heat-sealed, the air in the bag is exhausted through the special labyrinth channel structure at the bag opening, thereby realizing quick and compact packing, effectively preventing the content from 'swelling' and damage caused by residual air in the transportation process, and becoming the main stream of the industry. However, prior art labyrinthine vent re-bag webs have exposed the following key drawbacks and deficiencies in long-term use: The heat sealing effect is poor, the existing coiled materials mostly adopt common linear low-density polyethylene or low-density polyethylene as a heat sealing layer, the materials have low initial heat sealing temperature, but have poor heat viscosity and insufficient heat resistance, and on a high-speed automatic filling production line, the sealing which is not completely cooled after heat sealing is easily pulled away by the impact or friction of materials in the bag, so that air leakage or bag breaking is caused, and the packaging efficiency and the yield are seriously affected; The mechanical strength is insufficient, the re-packaging bag needs to bear the weight of tens to hundreds of kilograms of contents and is tested in storage stacking and transportation jolting, the reinforcing layer of the existing coiled material adopts single polypropylene or polyethylene woven cloth, and the warp and weft tensile strength, the tearing strength and the puncture resistance of the existing coiled material are provided with bottlenecks, and particularly under the working condition of frequently using a forklift to carry, the bottom and corners of the bag body are easy to be damaged due to local stress concentration; The material with poor barrier property and contradiction of cost, namely, the barrier capability of the existing coiled material is limited for materials needing moisture resistance or oxygen isolation, and a large amount of materials such as nylon or ethylene-vinyl alcohol copolymer with high barrier property are used in the industry for improving the performance, but the cost of raw materials is greatly increased; therefore, development of a labyrinth exhaust re-packaging bag coiled material which has excellent balance among heat sealing performance, mechanical strength and barrier performance, is controllable in cost and stable and feasible in production process and a matched production process thereof is needed. Disclosure of Invention The invention aims to provide a labyrinth exhaust re-packaging bag coiled material which has excellent heat sealing performance, high mechanical strength and good barrier property and is suitable for large-scale production and a production process thereof, so as to solve the problems in the background technology. The aim of the invention can be achieved by the following technical scheme: the labyrinth exhausting re-packing bag coiled material includes one protecting printed layer 15-30 microns, one reinforcing skeleton layer 80-120 microns, one blocking adhesive layer 25-45 microns and one heat sealing layer 40-60 microns; The reinforced framework layer is formed by compounding biaxially oriented polypropylene (BOPP) woven cloth and polyester spun-bonded non-woven cloth in a hot melt bonding mode; The barrier adhesive layer is formed by melt mixing an ethylene-vinyl alcohol copolymer, high-density polyethylene, a modified nano compound and a compatilizer according to the mass ratio of 20-40:30-50:15-30:5-10, wherein the ethylene-vinyl alcohol copolymer provides excellent oxygen barrier property, the ethylene content of the ethylene-vinyl alcohol copolymer is 32mol%, the high-density polyethylene provides rigidity, moisture barrier and cost balance, the melt index (190 ℃ and 2.16 kg) of the high-density polyethylene is 0.5-2.0g/10min, and the compatilizer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer, so that interlayer compatibility is ensured; The heat sealing layer is formed by melt mixing metallocene linear low-density polyethylene, high-melt-strength polypropylene, ultra-low-density polyethylene and an antistatic agent according to the mass ratio of 40-60:20-30:15-25:3-8, wherein the density of the metallocene linear low-density polyethylene is preferably 0.915-0.925g/cm 3 so as to provide low-temperature, rapid and high-strength heat sealing performance, the high-melt-strength polypropylene is used for improving the heat resistance and the hot viscosity of the heat sealing layer and preventing