Stretch-proof packaging film and processing equipment thereof

Abstract

The invention discloses a stretch-proof packaging film and processing equipment thereof, and aims at solving the problem that an existing packaging film is poor in tensile property. According to the technical scheme, the film comprises a film body, the film body comprises a stretch-proof surface layer and a stretch-proof inner layer which are arranged in parallel, a toughening layer is arranged between the stretch-proof surface layer and the stretch-proof inner layer, and the stretch-proof surface layer and the toughening layer are compounded through glue. The stretch-proof inner layer and the toughening layer are compounded by using glue, and non-compounded surfaces of the stretch-proof surface layer and the stretch-proof inner layer are coated with antibacterial coatings. Monodisperse silicon dioxide microspheres rich in hydroxyl are added during composite crosslinking of an active monomer and an anhydride-terminated carbon dioxide copolymer, reactive blending modification is performed, winding coating is formed, the compatibility is improved, the interface bonding force between the carbon dioxide copolymer and filled inorganic microspheres is enhanced, and the thermal conductivity of the carbon dioxide copolymer is improved. And the morphological structure is stabilized, and the tensile property is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging films, and more particularly to a stretch-resistant packaging film and processing equipment thereof. Background Art

[0002] With the rapid development of my country's economy, the plastic industry has also achieved rapid development. Plastic film is used for packaging and as a coating layer. Plastic packaging and plastic packaging products occupy an increasingly large share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical and other fields.

[0003] Polyethylene film is a colorless, tasteless, odorless, translucent, non-toxic insulating material, which is widely used as packaging bags, food bags, and various containers. Polyethylene film has the characteristics of moisture resistance and low moisture permeability, but the resilience and tensile strength of existing polyethylene films for packaging need to be improved. Polyethylene has poor impact resistance, is easy to age, and becomes brittle at low temperatures, making it difficult to use polyethylene materials in the interface collars of packaging bottles. Frequent use causes serious wear of the packaging bottle collars, so the development of tensile-resistant plastics has an important impact on the quality of product packaging.

[0004] However, the plastic films for packaging in the prior art generally have the problem of unsatisfactory tensile properties. For film materials, effectively improving the tensile strength and elongation at break of the film materials can further improve the application mode and scope of the film materials.

[0005] Therefore, a solution needs to be proposed to solve this problem. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a stretch-resistant packaging film and its processing equipment. By adding hydroxyl-rich monodisperse silica microspheres during the composite cross-linking of active monomers and anhydride-terminated carbon dioxide copolymers, not only the compatibility is improved, the interfacial adhesion between the carbon dioxide copolymer and the filled inorganic microspheres is enhanced, but also the morphological structure is stabilized and the tensile properties are improved.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a stretch-resistant packaging film, comprising a film body, the film body comprising a stretch-resistant surface layer and a stretch-resistant inner layer arranged in parallel, a toughening layer is arranged between the stretch-resistant surface layer and the stretch-resistant inner layer, the stretch-resistant surface layer and the toughening layer are compounded with glue, the stretch-resistant inner layer and the toughening layer are compounded with glue, and the non-compounded surfaces of the stretch-resistant surface layer and the stretch-resistant inner layer are coated with an antibacterial coating.

[0008] The present invention is further configured as follows: the toughening layer is a composite high-strength CPP film with tensile properties.

[0009] The present invention is further configured as follows: the thickness of the toughening layer is 0.01-0.02 mm.

[0010] The present invention is further configured as follows: the stretch-resistant surface layer and the stretch-resistant inner layer are firstly coated with modified inorganic mineral fibers by a hyperbranched polyurethane prepolymer with terminal isocyanate groups, then grafted with lignin fibers with soft segments, and finally mixed with high-density polyethylene, maleic anhydride grafted polyethylene, polystyrene, polydimethylsiloxane, calcium zinc heat stabilizer, and antioxidant, melt-extruded, cast into film, and stretched to form. The specific preparation steps are: a. mixing polyether polyol, diisocyanate, and a catalyst, heating to 60-90° C. and gradually performing polymerization reaction to obtain a terminal isocyanate polyurethane prepolymer;

[0011] b. Mixing the isocyanate-terminated polyurethane prepolymer obtained in step a with the hydroxyl-terminated hyperbranched polyester to prepare a spinning solution, adding inorganic mineral fibers to disperse evenly, and performing electrostatic spinning. The solution is collected and reacted at 40-60° C. for 3-5 hours. The isocyanate-terminated polyurethane prepolymer and the hydroxyl-terminated hyperbranched polyester react on the surface of the inorganic mineral fibers to generate an isocyanate-terminated hyperbranched polyurethane prepolymer, which is then in-situ coated and modified to obtain coated modified inorganic mineral fibers.

[0012] c. adding the coated modified inorganic mineral fiber obtained in step b to the lignin solution, heating to 80-90° C. for 15-20 hours of oil bath reaction, filtering, and drying to obtain a grafted product containing both soft and hard segments;

[0013] d. Mix the grafted product obtained in step c with high-density polyethylene, maleic anhydride grafted polyethylene, polystyrene, polydimethylsiloxane, calcium zinc heat stabilizer, and antioxidant 300, put them into a high-speed mixer, and stir them at a speed of 800-1000 r / min for 30-60 min to obtain a mixed material;

[0014] e. The mixed material obtained in step d is plasticized and extruded through a twin-screw extruder, and then cast through a T-die at 210-230° C., and quenched into a film by a casting cooling roller at a temperature of 20-40° C., and then heated to 90-110° C. in a hot stretching box, and stretched at a stretching ratio of 3-5 times to obtain a stretch-resistant surface layer and a stretch-resistant inner layer.

[0015] The above-mentioned technical purpose of the present invention is also achieved through the following technical scheme: a processing equipment for stretch-resistant packaging film, including a feeding mechanism for a film body, the feeding mechanism including a base and a bracket fixed on the upper end surface of the base, a unwinding roller is rotatably connected to the bracket, a dust removal box is provided on one side of the bracket, a feed port and a discharge port are respectively provided on both sides of the dust removal box, an upper end surface of the base is fixedly connected to a mounting frame, a transfer roller group is rotatably connected to the mounting frame, and the transfer roller group is located on the side of the dust removal box where the discharge port is provided.

[0016] The present invention is further configured as follows: a spraying area and a dust removal area are provided in the dust removal box, a plurality of spray heads are provided in the spraying area, a transmission roller rotatably connected to the inner wall of the dust removal box is also provided in the spraying area, and two cleaning rollers rotatably connected to the inner wall of the dust removal box are provided in the dust removal area, and the surfaces of the cleaning rollers on both sides are covered with cotton cloth.

[0017] In summary, the present invention has the following beneficial effects:

[0018] 1. The present invention adds hydroxyl-rich monodisperse silica microspheres during the composite cross-linking of active monomers and anhydride-terminated carbon dioxide copolymers to perform reactive blending modification. While initiating the formation of a cross-linked structure, carbon dioxide copolymer macromolecules are grafted onto the surface of the microspheres to form a entanglement coating, which not only improves the compatibility and enhances the interfacial adhesion between the carbon dioxide copolymer and the filled inorganic microspheres, but also stabilizes the morphological structure and improves the tensile properties, thereby effectively improving the mechanical properties and thermal stability of the intermediate barrier layer;

[0019] 2. The present invention sprays and wipes the film before loading the film body, which can remove static electricity on the film surface and remove impurities on the film surface through cotton cloth, thereby improving the subsequent processing quality of the film body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the processing equipment in the present invention.

[0021] In the figure: 1. base; 2. bracket; 3. unwinding roller; 4. dust removal box; 5. feed port; 6. discharge port; 7. transmission roller; 8. spray head; 9. cleaning roller; 10. transfer roller group. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is described in detail below in conjunction with the accompanying drawings.

[0026] A stretch-resistant packaging film comprises a film body, wherein the film body comprises a stretch-resistant surface layer and a stretch-resistant inner layer arranged in parallel, a toughening layer is arranged between the stretch-resistant surface layer and the stretch-resistant inner layer, the stretch-resistant surface layer and the toughening layer are compounded with glue, the stretch-resistant inner layer and the toughening layer are compounded with glue, and non-compounded surfaces of the stretch-resistant surface layer and the stretch-resistant inner layer are coated with an antibacterial coating.

[0027] The toughening layer is a composite high-strength CPP film with tensile properties, the thickness of the toughening layer is 0.01-0.02 mm, and the antibacterial coating is a chitosan film with antibacterial and freshness-preserving properties.

[0028] The tensile-resistant surface layer and the tensile-resistant inner layer are firstly coated with modified inorganic mineral fibers by a hyperbranched polyurethane prepolymer with terminal isocyanate groups, then grafted with lignin fibers with soft segments, and finally mixed with high-density polyethylene, maleic anhydride grafted polyethylene, polystyrene, polydimethylsiloxane, calcium zinc heat stabilizer, and antioxidant, melt extruded, cast into film, and stretched to form. The specific preparation steps are: a. mixing polyether polyol, diisocyanate and catalyst, heating to 60-90° C. and gradually performing polymerization reaction to obtain a terminal isocyanate polyurethane prepolymer;

[0029] b. Mixing the isocyanate-terminated polyurethane prepolymer obtained in step a with the hydroxyl-terminated hyperbranched polyester to prepare a spinning solution, adding inorganic mineral fibers to disperse evenly, and performing electrostatic spinning. The solution is collected and reacted at 40-60° C. for 3-5 hours. The isocyanate-terminated polyurethane prepolymer and the hydroxyl-terminated hyperbranched polyester react on the surface of the inorganic mineral fibers to generate an isocyanate-terminated hyperbranched polyurethane prepolymer, which is then in-situ coated and modified to obtain coated modified inorganic mineral fibers.

[0030] c. adding the coated modified inorganic mineral fiber obtained in step b to the lignin solution, heating to 80-90° C. for 15-20 hours of oil bath reaction, filtering, and drying to obtain a grafted product containing both soft and hard segments;

[0031] d. Mix the grafted product obtained in step c with high-density polyethylene, maleic anhydride grafted polyethylene, polystyrene, polydimethylsiloxane, calcium zinc heat stabilizer, and antioxidant 300, put them into a high-speed mixer, and stir them at a speed of 800-1000 r / min for 30-60 min to obtain a mixed material;

[0032] e. The mixed material obtained in step d is plasticized and extruded through a twin-screw extruder, and then cast through a T-die at 210-230° C., and quenched into a film by a casting cooling roller at a temperature of 20-40° C., and then heated to 90-110° C. in a hot stretching box, and stretched at a stretching ratio of 3-5 times to obtain a stretch-resistant surface layer and a stretch-resistant inner layer.

[0033] By adding hydroxyl-rich monodisperse silica microspheres during the composite cross-linking of active monomers and anhydride-terminated carbon dioxide copolymers, reactive blending modification is carried out. While initiating the formation of a cross-linked structure, carbon dioxide copolymer macromolecules are grafted onto the surface of the microspheres to form a entanglement coating, which not only improves the compatibility and enhances the interfacial adhesion between the carbon dioxide copolymer and the filled inorganic microspheres, but also stabilizes the morphological structure and enhances the tensile properties, thereby effectively improving the mechanical properties and thermal stability of the intermediate barrier layer. The composite high-strength CPP film has high heat sealing properties and good tensile properties.

[0034] A processing device for stretch-resistant packaging film, such as Figure 1 As shown, the feeding mechanism includes a film body, the feeding mechanism includes a base 1 and a bracket 2 fixed on the upper end surface of the base 1, a unwinding roller 3 is rotatably connected to the bracket 2, a dust removal box 4 is provided on one side of the bracket 2, a feed port 5 and a discharge port 6 are respectively provided on both sides of the dust removal box 4, a mounting frame is fixedly connected to the upper end surface of the base 1, a transfer roller group 10 is rotatably connected to the mounting frame, and the transfer roller group 10 is located on the side of the dust removal box 4 where the discharge port 6 is provided.

[0035] A spraying area and a dust removal area are arranged in the dust removal box body 4. A plurality of spray heads 8 are arranged in the spraying area. A transmission roller 7 rotatably connected to the inner wall of the dust removal box is also arranged in the spraying area. Two cleaning rollers 9 rotatably connected to the inner wall of the dust removal box body 4 are arranged in the dust removal area. The surfaces of the cleaning rollers 9 on both sides are covered with cotton cloth.

[0036] Working principle: When the film body is loaded, the film body will first be unwound from the unwinding roller 3, and then enter the dust removal box 4 from the feed port 5, and be transmitted forward through the transmission roller 7 in the dust removal box 4, pass between the cleaning rollers 9 on both sides, and then be discharged from the discharge port 6. After being discharged, it is transmitted to the next processing equipment through the transfer roller. When the transmission roller 7 carries the film body through the spraying area, the nozzle will spray water mist on the surface of the film body. When the wetted film body passes through the cleaning roller 9, the cotton cloth on the surface of the cleaning roller 9 will wipe and clean the surface of the film, so that the film can be dusted and destaticized before processing, so that the subsequent processing effect is better.

[0037] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A stretch-resistant packaging film, characterized in that: The invention comprises a film body, wherein the film body comprises a stretch-resistant surface layer and a stretch-resistant inner layer arranged in parallel, a toughening layer is arranged between the stretch-resistant surface layer and the stretch-resistant inner layer, the stretch-resistant surface layer and the toughening layer are compounded with glue, the stretch-resistant inner layer and the toughening layer are compounded with glue, and the non-compounded surfaces of the stretch-resistant surface layer and the stretch-resistant inner layer are coated with an antibacterial coating.

2. The stretch-resistant packaging film according to claim 1, characterized in that: The toughening layer is a composite high-strength CPP film with tensile properties.

3. The stretch-resistant packaging film according to claim 1, characterized in that: The thickness of the toughening layer is 0.01-0.02 mm.

4. The stretch-resistant packaging film according to claim 1, characterized in that: The stretch-resistant surface layer and the stretch-resistant inner layer are firstly coated with modified inorganic mineral fibers by a hyperbranched polyurethane prepolymer with terminal isocyanate groups, then grafted with lignin fibers with soft segments, and finally mixed with high-density polyethylene, maleic anhydride grafted polyethylene, polystyrene, polydimethylsiloxane, calcium zinc heat stabilizer, and antioxidant, melt extruded, cast into film, and stretched to form. The specific preparation steps are: a. mixing polyether polyol, diisocyanate and catalyst, heating to 60-90° C. and gradually performing polymerization reaction to obtain a terminal isocyanate polyurethane prepolymer; b. Mixing the isocyanate-terminated polyurethane prepolymer obtained in step a with the hydroxyl-terminated hyperbranched polyester to prepare a spinning solution, adding inorganic mineral fibers to disperse evenly, and performing electrostatic spinning. The solution is collected and reacted at 40-60° C. for 3-5 hours. The isocyanate-terminated polyurethane prepolymer and the hydroxyl-terminated hyperbranched polyester react on the surface of the inorganic mineral fibers to generate an isocyanate-terminated hyperbranched polyurethane prepolymer, which is then in-situ coated and modified to obtain coated modified inorganic mineral fibers. c. adding the coated modified inorganic mineral fiber obtained in step b to the lignin solution, heating to 80-90° C. for 15-20 hours of oil bath reaction, filtering, and drying to obtain a grafted product containing both soft and hard segments; d. Mix the grafted product obtained in step c with high-density polyethylene, maleic anhydride grafted polyethylene, polystyrene, polydimethylsiloxane, calcium zinc heat stabilizer, and antioxidant 300, put them into a high-speed mixer, and stir them at a speed of 800-1000 r / min for 30-60 min to obtain a mixed material; e. The mixed material obtained in step d is plasticized and extruded through a twin-screw extruder, and then cast through a T-die at 210-230° C., and quenched into a film by a casting cooling roller at a temperature of 20-40° C., and then heated to 90-110° C. in a hot stretching box, and stretched at a stretching ratio of 3-5 times to obtain a stretch-resistant surface layer and a stretch-resistant inner layer.

5. A stretch-resistant packaging film processing device according to any one of claims 1 to 4, characterized in that: The invention comprises a feeding mechanism for a film body, the feeding mechanism comprising a base (1) and a bracket (2) fixed to the upper end surface of the base (1), a reeling roller (3) being rotatably connected to the bracket (2), a dust removal box (4) being provided on one side of the bracket (2), a feed port (5) and a discharge port (6) being provided on both sides of the dust removal box (4), a mounting frame being fixedly connected to the upper end surface of the base (1), a transfer roller group (10) being rotatably connected to the mounting frame, and the transfer roller group (10) being located on the side of the dust removal box (4) on which the discharge port (6) is provided.

6. The processing equipment for stretch-resistant packaging film according to claim 5, characterized in that: The dust removal box (4) is provided with a spraying area and a dust removal area, the spraying area is provided with a plurality of spray heads (8), the spraying area is also provided with a transmission roller (7) rotatably connected to the inner wall of the dust removal box, and the dust removal area is provided with two cleaning rollers (9) rotatably connected to the inner wall of the dust removal box (4), and the surfaces of the cleaning rollers (9) on both sides are covered with cotton cloth.

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