CN115805698A - Tear-resistant antibacterial preservative packaging film blowing process and device and application thereof - Google Patents

Tear-resistant antibacterial preservative packaging film blowing process and device and application thereof Download PDF

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CN115805698A
CN115805698A CN202310060688.1A CN202310060688A CN115805698A CN 115805698 A CN115805698 A CN 115805698A CN 202310060688 A CN202310060688 A CN 202310060688A CN 115805698 A CN115805698 A CN 115805698A
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layer
raw material
film
winding
seat
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CN115805698B (en
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林勇
林伟贤
林伟存
陈少彬
钟祥绍
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Guangdong Zhongxing Plastic & Paper Printing Co ltd
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Guangdong Zhongxing Plastic & Paper Printing Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Abstract

The invention relates to the technical field of packaging films, and discloses a tear-resistant antibacterial preservative packaging film blowing process, a tear-resistant antibacterial preservative packaging film blowing device and application thereof. The tear-resistant antibacterial fresh-keeping packaging film comprises a four-layer structure which is sequentially provided with a layer A, a layer B, a layer C and a layer D; the method comprises the following steps: and (3) processing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material by four-layer co-extrusion film blowing devices through film blowing processes of heating melting, extrusion laminating, blowing, cooling and the like in sequence to obtain the tear-resistant antibacterial fresh-keeping packaging film. The prepared tear-resistant antibacterial fresh-keeping packaging film has excellent tear resistance and antibacterial fresh-keeping performance, is used for packaging food, and is safe and efficient.

Description

Tear-resistant antibacterial preservative packaging film blowing process and device and application thereof
Technical Field
The invention relates to the field of packaging films, in particular to a tear-resistant antibacterial preservative packaging film blowing process, a tear-resistant antibacterial preservative packaging film blowing device and application thereof.
Background
The packaging film is mainly a film for packaging articles, can be tightly attached to the articles and is suitable for packaging articles in various shapes, the packaged articles have sanitation, tightness and fixity, are sealed and packaged, are dustproof and moisture-resistant, have good protective performance, ensure the sanitation, safety and the like of the articles, and the packaging film is widely used in the industries of foreign trade export, paper making, hardware, plastic chemical industry, building materials, food, medicine and the like and is mainly used for packaging food, medicine and textiles. With the improvement of living standard of people, the problem of article safety is more and more emphasized. In the process of packaging articles, the material of the packaging film often has a great influence on the shelf life of the articles. In addition to this, the properties of the packaging film itself also influence the use of the packaging film, such as, above all, the tear resistance which influences the feel of use.
The dry-type compounding process is a process of coating an adhesive on one layer of film, drying the film by an oven, and then laminating the film and the other layer of film by hot pressing to form a compound film. Generally, in order to meet various performance requirements of a packaging film, multiple times of compounding are needed during preparation of the packaging film, so that the process has the problem of complicated steps. In addition, the process uses the adhesive, so that the toxicity problem of the residual solvent exists, the adhesive is a composite adhesive, the problems of organic solvent volatilization, environmental pollution, flammability, explosion and the like exist, and the process has the problems of large usage amount of the adhesive and high cost.
Chinese patent CN111483700B discloses a medical aseptic packaging film with tear resistance, which comprises a main body film and a protection part fixed at the peripheral edge of the main body film, wherein the protection part comprises a tear-resistant buffer layer, a bacteriostatic coating and a release layer, and the bacteriostatic coating is fixed between the tear-resistant buffer layer and the release layer. However, the packaging film prepared in the patent only adds the protection parts such as the tear-resistant buffer layer, the bacteriostatic coating and the like at the peripheral edge of the main film, and the tear resistance and the bacteriostatic performance are not reflected on the whole film. When the medical sterile packaging film is used for packaging, the release paper layer needs to be torn off from the protection part, and medical instruments are placed between the two layers of medical sterile packaging films, so that the using method is complex.
The Chinese patent CN105235345B uses a multilayer coextrusion extrusion compounding method and utilizes a polypropylene elastomer with excellent tear resistance to prepare a packaging film, but the packaging film does not improve the antibacterial and fresh-keeping performance.
Disclosure of Invention
In order to solve the technical problem, the invention provides a tear-resistant antibacterial preservative packaging film blowing process, wherein the packaging film comprises a four-layer structure comprising a layer A, a layer B, a layer C and a layer D in sequence; wherein, the raw material of the layer A comprises polyamide resin; the raw materials of the layer B comprise anhydride modified polypropylene bonding resin and polypropylene elastomer; the layer C raw material comprises anhydride modified ethylene-acrylate resin; the layer D comprises a bacteriostatic fresh-keeping layer, and the raw materials of the layer D comprise low-density polyethylene resin, tea polyphenol and epsilon-polylysine; the method comprises the following steps:
respectively placing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material in four extruders of a four-layer co-extrusion film blowing device for heating and melting to form a polymer melt of the layer A raw material, a polymer melt of the layer B raw material, a polymer melt of the layer C raw material and a polymer melt of the layer D raw material;
extruding the four polymer melts into a die head by corresponding extruders respectively for superposition to obtain film blanks;
the film blank consists of a polymer melt of a layer A raw material, a polymer melt of a layer B raw material, a polymer melt of a layer C raw material and a polymer melt of a layer D raw material from inside to outside in sequence;
step (3), performing inflation treatment on the film blank to obtain film bubbles, and cooling to obtain a composite film;
and (4) rolling the composite film to obtain the tear-resistant antibacterial preservative packaging film.
Preferably, in the raw material of the layer B, the anhydride modified polypropylene bonding resin accounts for 30% of the total weight of the raw material of the layer B, and the polypropylene elastomer accounts for 70% of the total weight of the raw material of the layer B; in the layer D raw materials, the low-density polyethylene resin accounts for 60% of the total weight of the layer D raw materials, the tea polyphenol accounts for 20% of the total weight of the layer D raw materials, and the epsilon-polylysine accounts for 20% of the total weight of the layer D raw materials.
Preferably, four extruders of the four-layer co-extrusion film blowing device are single-screw extruders, the temperature of the single-screw extruder body corresponding to the raw material of the layer A is 210-220 ℃, the temperature of the single-screw extruder body corresponding to the raw material of the layer B is 210-220 ℃, the temperature of the single-screw extruder body corresponding to the raw material of the layer C is 210-220 ℃, and the temperature of the single-screw extruder body corresponding to the raw material of the layer D is 170-190 ℃; the temperature of the die head is 190-220 ℃.
Preferably, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer A is 25-35r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer B is 15-20r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer C is 15r/min, and the screw rotating speed of the single screw extruder corresponding to the raw material of the layer D is 30-45r/min; preferably, the melt pressure of the single-screw extruder corresponding to the raw material of the layer A is 22-31MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer B is 13-17MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer C is 13MPa, and the melt pressure of the single-screw extruder corresponding to the raw material of the layer D is 26-40MPa.
Preferably, the total thickness of the composite membrane is 0.15mm; preferably, in the composite film, the thickness of the layer A accounts for 25-35% of the total thickness of the composite film, the thickness of the layer B accounts for 15-20% of the total thickness of the composite film, the thickness of the layer C accounts for 15% of the total thickness of the composite film, and the thickness of the layer D accounts for 30-45% of the total thickness of the composite film. The thickness ratio of each layer is realized by mainly controlling the screw rotating speed of the single screw extruder corresponding to the raw materials of each layer, the extruder with high screw rotating speed has large extrusion amount of the corresponding raw materials in unit time, namely, the occupied thickness ratio is large, the extruder with low screw rotating speed has small extrusion amount of the corresponding raw materials in unit time, namely, the occupied thickness ratio is small.
Preferably, the invention discloses a tear-resistant antibacterial fresh-keeping packaging film prepared by adopting the tear-resistant antibacterial fresh-keeping packaging film blowing process; the tear-resistant antibacterial preservative packaging film is used for food packaging, wherein the layer D of the tear-resistant antibacterial preservative packaging film is in direct contact with food.
Preferably, the invention also provides a four-layer co-extrusion film blowing device, which comprises a co-extrusion film blowing mechanism, a winding mechanism, a film cutting mechanism and a supporting mechanism, wherein the winding mechanism is arranged on one side of the co-extrusion film blowing mechanism and comprises a winding seat, a rotary driving assembly and winding rollers, the rotary driving assembly is arranged on the winding seat, the winding rollers are provided with two groups, the two groups of winding rollers are respectively arranged at two ends of the rotary driving assembly, and the rotary driving assembly is used for driving the two groups of winding rollers to rotate on the winding seat to do circular motion; the film cutting mechanism comprises two groups of linear driving assemblies, two groups of telescopic assemblies and two groups of blades, the two groups of linear driving assemblies are respectively arranged on one sides of the two groups of winding rollers, the two groups of blades are respectively arranged on the two groups of linear driving assemblies through the two groups of telescopic assemblies, the blades are mounted in the linear driving assemblies through the telescopic assemblies in a shrinkage mode, and when the linear driving assemblies drive the blades to do linear motion along the radial direction of the winding rollers, the telescopic assemblies drive the blades to pop out of the linear driving assemblies; the supporting mechanism comprises two groups of supporting rods, two groups of hinged seats and two groups of rotary transmission assemblies, the two groups of supporting rods are respectively rotatably mounted on one side of the two groups of winding rollers through the two groups of hinged seats, the two groups of supporting rods are tightly attached to the rotary driving assemblies, the two groups of supporting rods are respectively in transmission connection with the two groups of linear driving assemblies through the two groups of rotary transmission assemblies, and when the linear driving assemblies drive the blades to do linear motion along the radial direction of the winding rollers, the rotary transmission assemblies drive the supporting rods to rotatably unfold along the rotary driving assemblies; the co-extrusion film blowing mechanism comprises a rack, wherein four extruders and die heads positioned at the upper ends of the four extruders are fixedly mounted at the lower end of the rack, the discharge ends of the four extruders are communicated with the die heads, a herringbone plate and an extrusion roller which are mounted on the rack are sequentially arranged above the die heads, and a plurality of guide rollers are rotatably mounted on one side of the rack.
Preferably, the rotary driving assembly comprises a rotating shaft, a rotating frame and a rotating motor, the rotating shaft is rotatably mounted on the winding seat, the rotating motor is fixedly mounted on the winding seat through a motor seat, the output end of the rotating motor is in transmission connection with one end of the rotating shaft, the rotating frame is fixedly mounted on the rotating shaft, and the two groups of winding rollers are respectively rotatably mounted at two ends of the rotating frame; a locking piece is fixedly arranged between the outer side surface of the rotating frame and the inner side wall of the winding seat; the linear driving assembly comprises a double-rotor linear motor and a moving seat, the double-rotor linear motor is fixedly mounted on the rotating frame, the moving seat is fixedly mounted on each of two rotors in the double-rotor linear motor, and the blades are mounted on the moving seat through the telescopic assemblies.
Preferably, the telescopic assembly comprises a sliding seat and a sliding hole, the sliding hole is arranged inside the moving seat, the blade and the sliding seat are both slidably mounted inside the sliding hole, one end of the sliding seat is fixedly connected with the inner side end of the blade, the other end of the sliding seat is provided with a spring, and the tail end of the spring abuts against the end wall of the sliding hole; an opening extending to the inner side face of the moving seat is formed in one side of the sliding hole, and a knife edge of the blade is flush with the opening; a wedge-shaped groove is formed in the middle of the sliding seat, a wedge-shaped block is slidably mounted in the wedge-shaped groove, a push rod is fixedly mounted at one end of the wedge-shaped block, the push rod is inserted in the moving seat in a sliding mode, and one end of the push rod extends to the outside of the moving seat; the rotary transmission assembly comprises an L-shaped connecting rod, a connecting shaft, a sliding block and a sliding groove, the sliding groove is formed in one side of the supporting rod, the sliding block is slidably mounted in the sliding groove, the L-shaped connecting rod is fixedly mounted on the movable seat, one end of the connecting shaft is fixedly connected with one end of the L-shaped connecting rod, and the other end of the connecting shaft is rotatably connected with the sliding block.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention uses polyamide resin and polypropylene elastomer to prepare the anti-tearing antibacterial fresh-keeping packaging film, wherein the polyamide resin has good tensile resistance; the polypropylene elastomer has excellent tear resistance and puncture resistance, so that the tear-resistant antibacterial fresh-keeping packaging film prepared by the invention has excellent tear resistance;
2. according to the invention, the antibacterial fresh-keeping layer is prepared from the low-density polyethylene resin, the tea polyphenol and the epsilon-polylysine, the tea polyphenol can prolong the fresh-keeping period of food, prevent the food from fading and inhibit and kill bacteria, the epsilon-polylysine is polypeptide with antibacterial effect, has strong hygroscopicity, and the two have synergistic effect, so that the antibacterial fresh-keeping layer has low water vapor permeability and good antibacterial activity, can avoid the loss of a large amount of water in the food, and achieves a good antibacterial fresh-keeping effect;
3. the invention uses the multilayer coextrusion extrusion composite process to prepare the composite film with the multilayer structure, the layers of the composite film are combined by hot melting without using an adhesive, the safety and the sanitation are reliable, the dry-type composite film has the incomparable advantages, and the composite films with different performances can be flexibly designed by adjusting the raw materials and the thickness of each layer, so as to meet the requirements of different packages;
4. according to the four-layer co-extrusion film blowing device, two groups of winding rollers are arranged in a winding mechanism through a rotary driving assembly, meanwhile, a linear driving assembly and a blade are arranged on one side of each group of winding rollers, when a sufficient amount of composite film is wound on one group of winding rollers, the two groups of winding rollers can be driven to rotate and exchange positions through the rotary driving assembly, the linear driving assembly drives the blade to move to cut off the composite film, finally, the fracture of the composite film is wound and attached to a new winding roller manually, the composite film is wound by the new winding roller, and then the winding roller wound with the composite film is detached and replaced by workers; thereby through setting up two sets of wind-up rolls and blade, can be when one of them set of wind-up roll rolling has the capacity complex film, directly convolute complex film quick replacement on another set of wind-up roll to realize the incessant rolling of complex film, it is extravagant to cause the complex film when preventing that the wind-up roll from changing, and then reduces the manufacturing cost of complex film.
Drawings
FIG. 1 is a flow chart of the invention for preparing a tear-resistant bacteriostatic preservative film;
FIG. 2 is a schematic perspective view of a four-layer coextrusion film blowing apparatus according to the present invention;
FIG. 3 is a schematic perspective view of a co-extrusion film-blowing mechanism of the four-layer co-extrusion film-blowing apparatus according to the present invention;
FIG. 4 is a schematic perspective view of a winding mechanism of the four-layer co-extrusion film blowing apparatus according to the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 is a schematic view of a three-dimensional cutting structure of a winding mechanism of the four-layer co-extrusion film blowing device according to the present invention;
fig. 7 is a schematic enlarged view of a portion B of fig. 6 according to the present invention.
In fig. 2-7, the list of components represented by the various reference numbers is as follows:
500. compounding film; 1. a co-extrusion film blowing mechanism; 11. a frame; 12. an extruder; 13. a die head; 14. a herringbone plate; 15. a squeeze roll; 16. a guide roller; 2. a winding mechanism; 21. a winding seat; 22. a rotating shaft; 23. a rotating frame; 24. a rotating electric machine; 25. a coupling; 26. a wind-up roll; 27. a locking member; 3. a film cutting mechanism; 31. a double-rotor linear motor; 32. a movable seat; 33. a blade; 34. a sliding seat; 35. a wedge-shaped groove; 36. a wedge block; 37. a spring; 38. pushing the push rod; 39. a slide hole; 4. a support mechanism; 41. a support rod; 42. an L-shaped connecting rod; 43. a connecting shaft; 44. a hinged seat; 45. a slider; 46. a chute.
Description of the preferred embodiment
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
The embodiment discloses a tear-resistant antibacterial preservative packaging film blowing process, wherein the packaging film comprises a four-layer structure, namely a layer A, a layer B, a layer C and a layer D in sequence;
the method comprises the following steps:
respectively placing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material in four extruders of a four-layer co-extrusion film blowing device for heating and melting to form a polymer melt of the layer A raw material, a polymer melt of the layer B raw material, a polymer melt of the layer C raw material and a polymer melt of the layer D raw material;
extruding the four polymer melts into a die head by corresponding extruders respectively for superposition to obtain film blanks; the film blank consists of a polymer melt of a layer A raw material, a polymer melt of a layer B raw material, a polymer melt of a layer C raw material and a polymer melt of a layer D raw material from inside to outside in sequence;
step (3), carrying out inflation treatment on the film blank to obtain a film bubble, and cooling the film bubble to obtain a composite film;
step (4), rolling the composite film to obtain the tear-resistant antibacterial fresh-keeping packaging film; the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer A is 220 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer B is 220 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer C is 220 ℃, and the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer D is 190 ℃; the screw rotating speed of the single screw extruder corresponding to the raw material of the layer A is 25r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer B is 15r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer C is 15r/min, and the screw rotating speed of the single screw extruder corresponding to the raw material of the layer D is 45r/min; the melt pressure of the single-screw extruder corresponding to the raw material of the layer A is 22MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer B is 13MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer C is 13MPa, and the melt pressure of the single-screw extruder corresponding to the raw material of the layer D is 40MPa; the temperature of the die head is 220 ℃; the total thickness of the prepared composite membrane is 0.15mm; in the prepared composite film, the thickness of the layer A accounts for 25% of the total thickness of the composite film, the thickness of the layer B accounts for 15% of the total thickness of the composite film, the thickness of the layer C accounts for 15% of the total thickness of the composite film, and the thickness of the layer D accounts for 45% of the total thickness of the composite film.
Example 2
The embodiment discloses a tear-resistant antibacterial fresh-keeping packaging film blowing process, wherein the packaging film comprises a four-layer structure which is sequentially provided with a layer A, a layer B, a layer C and a layer D;
the method comprises the following steps:
respectively placing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material in four extruders of a four-layer co-extrusion film blowing device for heating and melting to form a polymer melt of the layer A raw material, a polymer melt of the layer B raw material, a polymer melt of the layer C raw material and a polymer melt of the layer D raw material;
extruding the four polymer melts into a die head by corresponding extruders respectively for superposition to obtain film blanks; the film blank consists of a polymer melt of a layer A raw material, a polymer melt of a layer B raw material, a polymer melt of a layer C raw material and a polymer melt of a layer D raw material from inside to outside in sequence;
step (3), carrying out inflation treatment on the film blank to obtain a film bubble, and cooling the film bubble to obtain a composite film;
step (4), rolling the composite film to obtain the anti-tear antibacterial preservative packaging film; the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer A is 215 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer B is 215 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer C is 215 ℃, and the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer D is 170 ℃; the rotating speed of the screws of the single screw extruder corresponding to the raw material of the layer A is 35r/min, the rotating speed of the screws of the single screw extruder corresponding to the raw material of the layer B is 20r/min, the rotating speed of the screws of the single screw extruder corresponding to the raw material of the layer C is 15r/min, and the rotating speed of the screws of the single screw extruder corresponding to the raw material of the layer D is 30r/min; the melt pressure of the single-screw extruder corresponding to the raw material of the layer A is 31MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer B is 17MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer C is 13MPa, and the melt pressure of the single-screw extruder corresponding to the raw material of the layer D is 26MPa; the temperature of the die head is 220 ℃; the total thickness of the prepared composite membrane is 0.15mm; in the composite film, the thickness of the layer A accounts for 35% of the total thickness of the composite film, the thickness of the layer B accounts for 20% of the total thickness of the composite film, the thickness of the layer C accounts for 15% of the total thickness of the composite film, and the thickness of the layer D accounts for 30% of the total thickness of the composite film.
Example 3
The embodiment discloses a tear-resistant antibacterial fresh-keeping packaging film blowing process, wherein the packaging film comprises a four-layer structure which is sequentially provided with a layer A, a layer B, a layer C and a layer D;
the method comprises the following steps:
respectively placing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material in four extruders of a four-layer co-extrusion film blowing device for heating and melting to form a polymer melt of the layer A raw material, a polymer melt of the layer B raw material, a polymer melt of the layer C raw material and a polymer melt of the layer D raw material;
extruding the four polymer melts into a die head by corresponding extruders respectively for superposition to obtain film blanks; the film blank consists of a polymer melt of a layer A raw material, a polymer melt of a layer B raw material, a polymer melt of a layer C raw material and a polymer melt of a layer D raw material from inside to outside in sequence;
step (3), carrying out inflation treatment on the film blank to obtain a film bubble, and cooling the film bubble to obtain a composite film;
step (4), rolling the composite film to obtain the tear-resistant antibacterial fresh-keeping packaging film; the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer A is 210 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer B is 210 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer C is 210 ℃, and the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer D is 175 ℃; the screw rotating speed of the single screw extruder corresponding to the raw material of the layer A is 30r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer B is 20r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer C is 15r/min, and the screw rotating speed of the single screw extruder corresponding to the raw material of the layer D is 35r/min; the melt pressure of the single-screw extruder corresponding to the raw material of the layer A is 26MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer B is 17MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer C is 13MPa, and the melt pressure of the single-screw extruder corresponding to the raw material of the layer D is 31MPa; the temperature of the die head is 210 ℃; the total thickness of the prepared composite membrane is 0.15mm; in the composite film, the thickness of the layer A accounts for 30% of the total thickness of the composite film, the thickness of the layer B accounts for 20% of the total thickness of the composite film, the thickness of the layer C accounts for 15% of the total thickness of the composite film, and the thickness of the layer D accounts for 35% of the total thickness of the composite film.
Example 4
The embodiment discloses a tear-resistant antibacterial fresh-keeping packaging film blowing process, wherein the packaging film comprises a four-layer structure which is sequentially provided with a layer A, a layer B, a layer C and a layer D; the method comprises the following steps:
respectively placing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material in four extruders of a four-layer co-extrusion film blowing device for heating and melting to form a polymer melt of the layer A raw material, a polymer melt of the layer B raw material, a polymer melt of the layer C raw material and a polymer melt of the layer D raw material;
extruding the four polymer melts into a die head by corresponding extruders respectively for superposition to obtain film blanks; the film blank consists of a polymer melt of a layer A raw material, a polymer melt of a layer B raw material, a polymer melt of a layer C raw material and a polymer melt of a layer D raw material from inside to outside in sequence;
step (3), carrying out inflation treatment on the film blank to obtain a film bubble, and cooling the film bubble to obtain a composite film;
step (4), rolling the composite film to obtain the anti-tear antibacterial preservative packaging film; the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer A is 210 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer B is 210 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer C is 210 ℃, and the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer D is 175 ℃; the screw rotating speed of the single screw extruder corresponding to the raw material of the layer A is 30r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer B is 15r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer C is 15r/min, and the screw rotating speed of the single screw extruder corresponding to the raw material of the layer D is 40r/min; the melt pressure of the single-screw extruder corresponding to the raw material of the layer A is 26MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer B is 13MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer C is 13MPa, and the melt pressure of the single-screw extruder corresponding to the raw material of the layer D is 35MPa; the temperature of the die head is 210 ℃; the total thickness of the prepared composite membrane is 0.15mm; in the composite film, the thickness of the layer A accounts for 30% of the total thickness of the composite film, the thickness of the layer B accounts for 15% of the total thickness of the composite film, the thickness of the layer C accounts for 15% of the total thickness of the composite film, and the thickness of the layer D accounts for 40% of the total thickness of the composite film.
In examples 1 to 4, the material of layer A was a polyamide resin; the raw materials of the layer B comprise anhydride modified polypropylene bonding resin and polypropylene elastomer; the raw material of the layer C is anhydride modified ethylene-acrylate resin; the layer D is a bacteriostatic fresh-keeping layer, and the raw materials of the layer D comprise low-density polyethylene resin, tea polyphenol and epsilon-polylysine; in the raw materials of the layer B, the anhydride modified polypropylene bonding resin accounts for 30 percent of the total weight of the raw materials of the layer B, and the polypropylene elastomer accounts for 70 percent of the total weight of the raw materials of the layer B; in the layer D raw materials, the low-density polyethylene resin accounts for 60% of the total weight of the layer D raw materials, the tea polyphenol accounts for 20% of the total weight of the layer D raw materials, and the epsilon-polylysine accounts for 20% of the total weight of the layer D raw materials.
Comparative example 1
The comparative example discloses a tear-resistant antibacterial preservative packaging film blowing process, wherein the packaging film comprises a four-layer structure which is an A layer, a B layer, a C layer and a D layer in sequence; the method comprises the following steps:
respectively placing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material in four extruders of a four-layer co-extrusion film blowing device for heating and melting to form a polymer melt of the layer A raw material, a polymer melt of the layer B raw material, a polymer melt of the layer C raw material and a polymer melt of the layer D raw material;
extruding the four polymer melts into a die head by corresponding extruders respectively for superposition to obtain film blanks; the film blank consists of a polymer melt of a layer A raw material, a polymer melt of a layer B raw material, a polymer melt of a layer C raw material and a polymer melt of a layer D raw material from inside to outside in sequence;
step (3), carrying out inflation treatment on the film blank to obtain a film bubble, and cooling the film bubble to obtain a composite film;
step (4), rolling the composite film to obtain the tear-resistant antibacterial fresh-keeping packaging film; the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer A is 215 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer B is 215 ℃, the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer C is 215 ℃, and the temperature of the machine body of the single screw extruder corresponding to the raw material of the layer D is 170 ℃; the screw rotating speed of the single screw extruder corresponding to the raw material of the layer A is 35r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer B is 20r/min, the screw rotating speed of the single screw extruder corresponding to the raw material of the layer C is 15r/min, and the screw rotating speed of the single screw extruder corresponding to the raw material of the layer D is 30r/min; the melt pressure of the single-screw extruder corresponding to the raw material of the layer A is 31MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer B is 17MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer C is 13MPa, and the melt pressure of the single-screw extruder corresponding to the raw material of the layer D is 26MPa; the temperature of the die head is 220 ℃; the total thickness of the prepared composite membrane is 0.15mm; in the composite film, the thickness of the layer A accounts for 35% of the total thickness of the composite film, the thickness of the layer B accounts for 20% of the total thickness of the composite film, the thickness of the layer C accounts for 15% of the total thickness of the composite film, and the thickness of the layer D accounts for 30% of the total thickness of the composite film; wherein, the raw material of the layer A is polyamide resin; the raw materials of the layer B are anhydride modified polypropylene bonding resin and polypropylene elastomer; the raw material of the layer C is anhydride modified ethylene-acrylate resin; the layer D is an antibacterial fresh-keeping layer, and the raw material of the layer D is low-density polyethylene resin; in the raw materials of the layer B, the anhydride modified polypropylene bonding resin accounts for 30% of the total weight of the raw materials of the layer B, and the polypropylene elastomer accounts for 70% of the total weight of the raw materials of the layer B.
Comparative example 2
The comparative example discloses a tear-resistant antibacterial preservative packaging film blowing process, which comprises the following steps:
heating and melting raw materials of low-density polyethylene resin, tea polyphenol and epsilon-polylysine in a single-screw extruder to obtain a polymer melt;
extruding the polymer melt through a die head of a single-screw extruder to obtain a film blank;
step (3), carrying out inflation treatment on the film blank to obtain a film bubble, and cooling the film bubble to obtain a film;
step (4), rolling the film to obtain the tear-resistant antibacterial fresh-keeping packaging film; wherein the temperature of the machine body of the single-screw extruder is 170 ℃; the screw rotating speed of the single screw extruder is 45r/min; the melt pressure of the single-screw extruder is 40MPa; the temperature of the die head is 220 ℃; the total thickness of the prepared film is 0.15mm; the low-density polyethylene resin accounts for 60 percent of the total weight of the raw materials, the tea polyphenol accounts for 20 percent of the total weight of the raw materials, and the epsilon-polylysine accounts for 20 percent of the total weight of the raw materials.
In all of the above examples and comparative examples, the polyamide resin was a copolymer of polyamide 6 and polyamide 66 from Shanghai Fuchen Plastic materials Ltd, manufactured by Pasteur, germany, and having a type C33; the anhydride modified polypropylene adhesive resin is from Camphor wood catalpes plastic Ministry of Japan, and is named as Dupont Baoyang 50E803 in USA; polypropylene elastomer propylene-based elastomer VM-3000 from Widamet; the anhydride modified ethylene-acrylate resin is from the Ministry of Camphor wood catalpol plastic of Dongguan and is named as Dupont Baoyang 21E533 in the United states; the low-density polyethylene resin is from auspicious plastication science and technology limited of Dongguan city, the brand is Japan department of Japan, and the model is L719; the tea polyphenols are from Wedeli chemical reagent of Hubei, CAS number 84650-60-2; the epsilon-polylysine is from Topson Biotech, inc. of Beijing, CAS number 28211-04-3.
In comparative example 1, tea polyphenol and epsilon-polylysine were not added to the D layer in addition to example 2, and in comparative example 2, only one layer (D layer) was prepared in addition to example 1.
Test examples
The tear-resistant antibacterial preservative packaging films prepared in the examples 1-4 and the comparative examples 1-2 are subjected to performance tests:
1. tear resistance: tensile strength was tested according to GB/T1040-1992, tear strength was tested according to QB/T1130-1991;
2. antibacterial property: the bacteriostatic properties of the membranes were tested by plate colony counting. Taking a certain amount of (10) 6 CFU/mL) of the suspension of the escherichia coli and the staphylococcus aureus is dripped on the surfaces of the anti-tear and anti-bacteria fresh-keeping packaging films prepared in the examples 1-4 and the comparative examples 1-2, and after the uniform smearing, the films are placed in an incubator at 37 +/-1 ℃ for culturing for 4 hours. Then soaking the bacteria in a centrifuge tube of PBS buffer solution, shaking the bacteria on a constant temperature shaking table at 37 +/-1 ℃ for 10min, and then diluting the bacteria in the PBS buffer solution. 60 μ L of diluted PBS buffer was pipetted onto agar medium plates and incubated at 37. + -. 1 ℃ for 24h, each of which was repeated 3 times. Taking bacterial suspension without preservative film as a control group; the test results are shown in table 1:
TABLE 1
Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2
Tensile strength/MPa 32 34.3 33.8 33.4 34 14.5
Tear Strength/KN m -1 160 166 164 163 166 110
Inhibition of E.coli/%) 88.55 85.56 86.52 87.66 24.61 92.21
Inhibition of Staphylococcus aureus/%) 84.57 81.51 82.62 83.43 18.57 89.17
The results in table 1 show that the tear-resistant antibacterial fresh-keeping packaging film prepared by the invention has high tensile strength and tear strength, high inhibition rate on escherichia coli and staphylococcus aureus, and excellent tear resistance and antibacterial fresh-keeping performance. The tensile strength and the tear strength of the examples 1 to 4 are superior to those of the comparative example 2, and the bacteriostasis rates of escherichia coli and staphylococcus aureus of the examples 1 to 4 are superior to those of the comparative example 1; the polyamide and polypropylene elastomer has good tear resistance, and the tea polyphenol and the epsilon-polylysine have good bacteriostatic and fresh-keeping effects. Comparing the thickness of the layer D in each example with the total thickness of the composite film, the example 1 is larger than the examples 2-4, so the bacteriostatic and fresh-keeping effect of the example 1 is the best; compared with the embodiment 1, the comparative example 2 only contains one D layer with the bacteriostasis and fresh-keeping effects, so the bacteriostasis and fresh-keeping effects of the embodiment 1 are lower than those of the comparative example 2. Comparing the sum of the thickness of the layer A and the thickness of the layer B in each example to the total thickness of the composite film, the tear resistance of the example 2 is the best when the example 2 is larger than the examples 1, 3 and 4, and the tear resistance of the comparative example 1 is not much different from that of the example 2 because the tea polyphenol and the epsilon-polylysine are not added on the basis of the example 2. Therefore, the tear-resistant antibacterial fresh-keeping packaging film prepared by the invention has excellent tear-resistant and antibacterial fresh-keeping performances.
Example 5
The embodiment provides a four-layer co-extrusion film blowing device which can meet the preparation treatment of the tear-resistant antibacterial preservative packaging films in the embodiments 1 to 4 and the comparative example 1.
Referring to fig. 2, 4 and 5, a four-layer co-extrusion film blowing device includes a co-extrusion film blowing mechanism 1, a winding mechanism 2, a film cutting mechanism 3 and a supporting mechanism 4, wherein the winding mechanism 2 is disposed on one side of the co-extrusion film blowing mechanism 1, the winding mechanism 2 includes a winding seat 21, two groups of rotating driving components and winding rollers 26, the rotating driving components are mounted on the winding seat 21, the winding rollers 26 are provided with two groups, the two groups of winding rollers 26 are respectively mounted at two ends of the rotating driving components, and the rotating driving components are used for driving the two groups of winding rollers 26 to rotate on the winding seat 21 to perform circular motion; the film cutting mechanism 3 comprises two groups of linear driving assemblies, two groups of telescopic assemblies and two groups of blades 33, the two groups of linear driving assemblies are respectively installed on one sides of the two groups of winding rollers 26, the two groups of blades 33 are respectively installed on the two groups of linear driving assemblies through the two groups of telescopic assemblies, the blades 33 are installed in the linear driving assemblies in a shrinkage mode through the telescopic assemblies, and when the linear driving assemblies drive the blades 33 to do linear motion along the radial direction of the winding rollers 26, the telescopic assemblies drive the blades 33 to pop out of the linear driving assemblies; the supporting mechanism 4 comprises two groups of supporting rods 41, two groups of hinged seats 44 and two groups of rotary transmission components, the two groups of supporting rods 41 are respectively rotatably mounted on one side of the two groups of winding rollers 26 through the two groups of hinged seats 44, the two groups of supporting rods 41 are tightly attached to the rotary driving components, the two groups of supporting rods 41 are respectively in transmission connection with the two groups of linear driving components through the two groups of rotary transmission components, and when the linear driving components drive the blades 33 to do linear motion along the radial direction of the winding rollers 26, the rotary transmission components drive the supporting rods 41 to be rotatably unfolded along the rotary driving components; when the four-layer co-extrusion film blowing device works, the composite film 500 prepared by the co-extrusion film blowing mechanism 1 is firstly wound by the winding roller 26 at the upper end, after enough composite film 500 is wound on the winding roller 26 at the upper end, the two groups of winding rollers 26 are driven by the rotary driving assembly to do circular motion in the anticlockwise direction until the two groups of winding rollers 26 change positions after rotating 180 degrees, and the composite film 500 is drawn by the wind-up roll 26 through the lower end of the rotary driving assembly, the linear driving assembly is positioned above the composite film 500, the support rod 41 is positioned at the side below the composite film 500, and then the blade 33 is driven by the linear driving assembly to move toward the composite film 500, and at this time, the blade 33 is ejected out of the linear driving assembly under the driving of the telescopic assembly, the edge of one side of the blade 33 is just opposite to the edge of the composite film 500, then the linear driving assembly drives the blade 33 to continuously move towards one side of the composite film 500, thereby moving the blade 33 through the composite film 500 and cutting the composite film 500 while passing, while the linear driving assembly drives the blade 33 to move, the linear driving assembly drives the supporting rod 41 to rotate and unfold towards the lower part of the compound film 500 through the rotary transmission assembly, until the blade 33 completely cuts off the compound film 500, the supporting rod 41 unfolds under the compound film 500, the end part of the composite film 500 at one side of the co-extrusion film blowing mechanism 1 is supported and positioned to prevent the cut composite film 500 from moving to one side of the co-extrusion film blowing mechanism 1, then the end part of the composite film 500 is wound on another set of winding rollers 26 which just move to the upper end by workers, the winding rollers 26 continue to wind the composite film 500, thereby realize the incessant rolling of complex film 500, can prevent to cause complex film 500 extravagant when wind-up roll 26 changes, and then reduce the manufacturing cost of complex film 500.
Referring to fig. 2-3, the co-extrusion film blowing mechanism 1 includes a frame 11, four extruders 12 and die heads 13 located at the upper ends of the four extruders 12 are fixedly installed at the lower end of the frame 11, discharge ends of the four extruders 12 are all communicated with the die heads 13, a herringbone plate 14 and an extrusion roller 15 installed on the frame 11 are sequentially arranged above the die heads 13, and a plurality of guide rollers 16 are rotatably installed at one side of the frame 11; wherein, an air pump is arranged in the die head 13, a cooling air ring is arranged on the outer ring of the die head 13, the end part of the extrusion roller 15 is connected with a motor in a transmission way, when the co-extrusion film blowing mechanism 1 works, firstly, four raw materials are respectively conveyed and placed in four extruders 12 to be heated and melted into polymer melt, then, the polymer melt is extruded into the die head 13 by the four extruders 12 to be superposed, and the overlapped polymer melt is blown by an air pump in the die head 13 to form a film bubble, the cooling air ring is used for air cooling the outside of the film bubble, the film bubble is extruded by a herringbone plate 14 in a limiting way and then is extruded by an extrusion roller 15 driven by a motor to prepare a composite film 500, and the prepared composite film 500 is guided by a guide roller 16 in a limiting way and then is wound on a winding roller 26 at the upper end of a winding seat 21.
Referring to fig. 2 and 4, the rotation driving assembly includes a rotating shaft 22, a rotating frame 23 and a rotating motor 24, the rotating shaft 22 is rotatably mounted on the winding seat 21, the rotating motor 24 is fixedly mounted on the winding seat 21 through a motor seat, an output end of the rotating motor 24 is in transmission connection with one end of the rotating shaft 22, the rotating frame 23 is fixedly mounted on the rotating shaft 22, and two sets of winding rollers 26 are respectively rotatably mounted at two ends of the rotating frame 23;
two groups of winding motors are arranged in the rotating frame 23, and are respectively in transmission connection with grouped winding rollers 26, when the winding mechanism 2 works, the winding rollers 26 at the upper end are driven by the winding motors to wind the composite film 500, when the winding rollers 26 at the upper end wind enough composite film 500 and need to be replaced by another group of winding rollers 26 to wind the composite film 500, the winding motors which are working are closed, and the other group of winding motors are opened, so that the other group of winding rollers 26 are driven to rotate, meanwhile, the rotating shaft 22 and the rotating frame 23 are driven by the rotating motor 24 to rotate anticlockwise, so that the two groups of winding rollers 26 are driven to perform anticlockwise circular motion, the winding rollers 26 which stop rotating stretch the composite film 500 in the circular motion process, so that the composite film 500 is always kept in a tensioning state until the positions of the two groups of winding rollers 26 are switched after rotating 180 degrees, the composite film 500 is stretched below the rotating frame 23, then the composite film 500 is driven by the linear driving blade 33 at the upper end of the rotating frame 23 to cut composite film 500, and the end of the winding rollers 500 which are close to one side of the co-winding mechanism 1 and are blown by the composite film is rewound on the rotating frame 23, and the composite film 500 is continuously rotated by a manual operation; furthermore, transmission shafts are rotatably mounted on two sides of the rotating frame 23, the transmission shaft on one side is in transmission connection with the winding motor, and two ends of each winding roller 26 are detachably and fixedly connected with the transmission shafts on the two sides through the couplers 25, so that when two groups of winding rollers 26 are exchanged, the winding roller 26 wound with the sufficient composite film 500 is moved to the lower end of the rotating frame 23, and the other group of winding rollers 26 is moved to the upper end of the rotating frame 23 to continuously wind the composite film 500, a worker can conveniently detach and take down the winding roller 26 wound with the sufficient composite film 500, and then replace a new blank winding roller 26 to perform rotary transposition of the winding roller 26 of the next round, so that reciprocating is performed, and the composite film 500 can be continuously wound until the whole four-layer co-extrusion film blowing device is stopped.
Referring to fig. 4, a locking member 27 is fixedly installed between the outer side surface of the rotating frame 23 and the inner side wall of the winding seat 21; preferably, the locking member 27 is a magnetic lock, which includes four permanent magnetic sheets and two electromagnetic sheets, wherein the four permanent magnetic sheets are respectively and fixedly mounted at two ends of the outer side surface of the rotating frame 23, the two electromagnetic sheets are fixedly mounted on the inner side wall of the winding seat 21, when the winding roller 26 normally winds, the two electromagnetic sheets are energized to generate magnetic force, and are respectively and fixedly adsorbed to the two permanent magnetic sheets at the lower end of the rotating frame 23, so that the rotating frame 23 and the winding seat 21 are locked and fixed, so as to improve the stability of the rotating frame 23 and the winding roller 26, and when the rotating frame 23 needs to rotate to exchange positions of the two winding rollers 26, the two electromagnetic sheets are first de-energized, i.e., the two electromagnetic sheets are de-energized, so that the permanent magnetic sheets and the electromagnetic sheets are disconnected, so that the rotating frame 23 and the winding seat 21 are unlocked, and then the rotating frame 23 can be rotated to replace the winding roller 26.
Referring to fig. 2, 4-5, the linear driving assembly includes a dual mover linear motor 31 and a moving base 32, the dual mover linear motor 31 is fixedly mounted on the rotating frame 23, the moving base 32 is fixedly mounted on both movers of the dual mover linear motor 31, and the blade 33 is mounted on the moving base 32 through the telescopic assembly; preferably, the dual-mover linear motor 31 is a dual-mover linear motor module of a DAH60HS2B1 model, and two movers are arranged in the linear motor module and can drive the two movers to move in opposite directions to fold and move in reverse direction to reset when working; when the composite membrane 500 needs to be cut, the double-rotor linear motor 31 drives the two rotors to move towards each other and close, so as to drive the two movable seats 32 to move and close, the telescopic assembly drives the blades 33 to pop up when the movable seats 32 move, so that the knife edges of the blades 33 are opposite to the composite membrane 500, then the blades 33 move along with the movable seats 32 to pass through the position of the composite membrane 500, the composite membrane 500 is gradually cut off until the two rotors are closed and butted, the two blades 33 just move to the middle of the composite membrane 500 in the width direction, and the composite membrane 500 is cut off through the matching of the two blades 33.
Referring to fig. 2, 6-7, the telescopic assembly includes a sliding seat 34 and a sliding hole 39, the sliding hole 39 is disposed inside the moving seat 32, the blade 33 and the sliding seat 34 are both slidably mounted inside the sliding hole 39, one end of the sliding seat 34 is fixedly connected with an inner end of the blade 33, the other end of the sliding seat 34 is mounted with a spring 37, and a tail end of the spring 37 abuts against an end wall of the sliding hole 39; a wedge-shaped groove 35 is formed in the middle of the sliding seat 34, a wedge-shaped block 36 is slidably mounted in the wedge-shaped groove 35, one end of the wedge-shaped block 36 is fixedly mounted with a push rod 38, the push rod 38 is slidably inserted into the moving seat 32, and one end of the push rod 38 extends to the outside of the moving seat 32; when the follower of the movable seat 32 is located at the end of the dual-rotor linear motor 31, the ejector rod 38 abuts against the end wall of the dual-rotor linear motor 31, and the ejector rod 38 retracts into the movable seat 32 under the abutting action of the end wall of the dual-rotor linear motor 31, at this time, the wedge block 36 is pushed by the ejector rod 38 to move to the right end of the wedge groove 35, and the sliding seat 34 is pushed to move into the sliding hole 39 through the inclined surface, so that the sliding seat 34 drives the blade 33 to move into the sliding hole 39, the blade 33 retracts into the sliding hole 39, the blade 33 can be prevented from being scratched by the blade 33 when a worker mounts and detaches the wind-up roll 26, the safety of the worker during working is improved, and the spring 37 is squeezed by the sliding seat 34 to retract to generate return elastic force, when the double-rotor linear motor 31 drives the rotor, the moving seat 32 and the blade 33 move to cut the composite film 500, the ejector rod 38 is not abutted and limited by the end wall of the motor any longer as the moving seat 32 moves away from the end wall of the double-rotor linear motor 31, at this time, the sliding seat 34 slides outwards along the sliding hole 39 to reset under the action of the reset elastic force of the spring 37, and drives the blade 33 to reset and extend out of the sliding hole 39, so that the blade 33 can cut the composite film 500, and meanwhile, the wedge block 36 slides outwards to reset under the pushing and guiding action of the inclined surface of the wedge groove 35, and drives the ejector rod 38 to move outwards to reset, so that the outer side end of the ejector rod 38 extends out of the moving seat 32 again.
Referring to fig. 2, 6-7, the rotary transmission assembly includes an L-shaped connecting rod 42, a connecting shaft 43, a sliding block 45 and a sliding slot 46, the sliding slot 46 is disposed at one side of the supporting rod 41, the sliding block 45 is slidably mounted in the sliding slot 46, the L-shaped connecting rod 42 is fixedly mounted on the moving seat 32, one end of the connecting shaft 43 is fixedly connected with one end of the L-shaped connecting rod 42, and the other end of the connecting shaft 43 is rotatably connected with the sliding block 45; when the double-rotor linear motor 31 drives the rotor, the movable seat 32 and the blade 33 to move to cut the compound film 500, the movable seat 32 moves away from the inner side wall of the rotary frame 23, the movable seat 32 drives the connecting shaft 43 and the slider 45 to synchronously and horizontally move through the L-shaped connecting rod 42, the slider 45 gradually moves towards the other end of the sliding groove 46 from the top end of the sliding groove 46 while moving horizontally, the slider 45 further gradually moves towards one end of the supporting rod 41, and the slider 45 gradually lifts one end of the supporting rod 41 during moving, so that the supporting rod 41 gradually rotates upwards with the hinge seat 44 as a rotation fulcrum, and the slider 45 rotates with the supporting rod 41 and the sliding groove 46 during rotating, so that the slider 45 is always slidably mounted in the sliding groove 46, until the two movable seats 32 on the double-rotor linear motor 31 move together and the compound film 500 is folded through the blade 33, the supporting rod 41 rotates and is supported below the compound film 500 close to one side of the co-extrusion film blowing mechanism 1, the winding mechanism 500 is positioned to prevent a person from winding the cut off the compound film 500, and finally the winding roll 500 is mounted on the co-extrusion film winding mechanism 26.
Referring to fig. 2, 5 and 7, an opening extending to the inner side surface of the movable seat 32 is formed in one side of the slide hole 39, and the knife edge of the blade 33 is flush with the opening, by forming the opening, the knife edge of the blade 33 can be flush with the end surface of the movable seat 32, and when the two movable seats 32 are moved toward each other and butted, the knife edges of the two blades 33 in the two movable seats 32 are also exactly butted, so that the two blades 33 can be ensured to be exactly matched to cut off the composite film 500.
The use method comprises the following steps: firstly, respectively conveying four raw materials into four extruders 12 to be heated and melted into polymer melt, then extruding the polymer melt into a die head 13 by the four extruders 12 to be overlapped, blowing the overlapped polymer melt by an air pump in the die head 13 to form a film bubble, simultaneously carrying out air cooling on the outside of the film bubble by a cooling air ring, carrying out limit extrusion on the film bubble by a herringbone plate 14, then carrying out extrusion by an extrusion roller 15 driven by a motor to prepare a composite film 500, guiding and limiting the prepared composite film 500 by a guide roller 16, then winding the composite film 500 on a winding roller 26 at the upper end of a winding seat 21, and continuously winding the composite film 500 by the winding roller 26; when the winding roller 26 at the upper end is wound with enough composite film 500 and needs to be replaced with another winding roller 26 to wind the composite film 500, the winding motor which is working is turned off, and the other winding motor is turned on to drive the other winding roller 26 to start rotating, and meanwhile, the rotating shaft 22 and the rotating frame 23 are driven by the rotating motor 24 to rotate anticlockwise so as to drive the two winding rollers 26 to do anticlockwise circular motion, and the winding roller 26 which stops rotating stretches the composite film 500 in the circular motion process, so that the composite film 500 is always kept in a tensioned state until the two winding rollers 26 rotate 180 degrees and then are switched, and the composite film 500 is stretched to pass below the rotating frame 23; then, the double-rotor linear motor 31 at the upper end of the rotating frame 23 is started, the double-rotor linear motor 31 drives the two rotors to move and close in opposite directions, and further drives the two moving seats 32 to move and close, the pushing rod 38 is not abutted and limited by the end walls of the motors along with the moving seats 32 moving away from the end walls of the double-rotor linear motor 31, at the moment, the sliding seat 34 slides outwards along the sliding hole 39 to reset under the action of the reset elastic force of the spring 37, and drives the blades 33 to extend out from the sliding hole 39 in a resetting manner, so that the knife edges of the blades 33 are opposite to the composite film 500, then the blades 33 move along with the moving seats 32 to pass through the position of the composite film 500, the composite film 500 is gradually cut off until the two moving seats 32 are closed and butted, the two blades 33 just move to the middle part of the width direction of the composite film 500, and the composite film 500 is cut off through the matching of the two blades 33; meanwhile, as the moving seat 32 moves away from the inner side wall of the rotating frame 23, the moving seat 32 drives the connecting shaft 43 and the sliding block 45 to synchronously and horizontally move through the L-shaped connecting rod 42, while the sliding block 45 gradually moves towards the other end of the sliding groove 46 at the top end of the sliding groove 46 while moving horizontally, so that the sliding block 45 gradually moves towards one end of the supporting rod 41, and the sliding block 45 gradually lifts one end of the supporting rod 41 in the moving process, so that the supporting rod 41 gradually rotates upwards to be unfolded by taking the hinge seat 44 as a rotation fulcrum, until the two moving seats 32 on the double-rotor linear motor 31 move together and cut off the composite film 500 through the blade 33, the supporting rod 41 rotates to be unfolded and is supported below the composite film 500 close to one side of the co-extrusion film blowing mechanism 1, the composite film 500 close to one side of the co-extrusion film blowing mechanism 1 is supported and positioned, the fracture of the composite film 500 after being cut off is prevented from moving towards the co-extrusion film blowing mechanism 1, and finally the composite film 500 on the surface of the winding roll 26 on which the composite film 500 is wound by an operator; finally, the moving seat 32 and the blade 33 are driven to move and reset by the double-rotor linear motor 31, in addition, the moving seat 32 is driven to horizontally move and reset in the moving reset process, the supporting rod 41 is driven to rotate and reset by the sliding block 45, after the moving seat 32 is completely reset, the pushing rod 38 is abutted against the end wall of the double-rotor linear motor 31, the pushing rod 38 retracts into the moving seat 32 under the abutting action of the end wall of the motor, at the moment, the wedge-shaped block 36 is pushed and moved to the right side end of the wedge-shaped groove 35 by the pushing rod 38, the sliding seat 34 is pushed and moved towards the sliding hole 39 through the inclined surface, so that the blade 33 is driven by the sliding seat 34 to move towards the sliding hole 39, the blade 33 is contracted into the sliding hole 39, then the winding roller 26 which is moved to the lower end of the rotating frame 23 and wound with the enough winding-up roller 500 is dismounted and taken down by a worker, a new blank winding-up roller 26 is replaced, so as to carry out the rotary transposition of the next roller 26 of the next roller to reciprocate, and the co-extrusion composite film can be continuously wound up and wound up until the whole co-extrusion film is continuously carried out, and the whole machine is continuously carried out until the four-extrusion composite film is continuously carried out.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The tear-resistant antibacterial preservative packaging film blowing process is characterized in that the tear-resistant antibacterial preservative packaging film comprises a four-layer structure which is an A layer, a B layer, a C layer and a D layer in sequence; wherein, the raw material of the layer A comprises polyamide resin; the raw materials of the layer B comprise anhydride modified polypropylene bonding resin and polypropylene elastomer; the raw material of the layer C comprises anhydride modified ethylene-acrylate resin; the raw materials of the layer D comprise low-density polyethylene resin, tea polyphenol and epsilon-polylysine; the method comprises the following steps:
respectively placing the layer A raw material, the layer B raw material, the layer C raw material and the layer D raw material in four extruders of a four-layer co-extrusion film blowing device for heating and melting to form a polymer melt of the layer A raw material, a polymer melt of the layer B raw material, a polymer melt of the layer C raw material and a polymer melt of the layer D raw material;
extruding the four polymer melts into a die head by corresponding extruders respectively for superposition to obtain film blanks;
the film blank consists of a polymer melt of a layer A raw material, a polymer melt of a layer B raw material, a polymer melt of a layer C raw material and a polymer melt of a layer D raw material from inside to outside in sequence;
step (3), performing inflation treatment on the film blank to obtain film bubbles, and cooling to obtain a composite film;
and (4) rolling the composite film to obtain the tear-resistant antibacterial fresh-keeping packaging film.
2. The tear-resistant antibacterial preservative packaging film blowing process according to claim 1, wherein in the layer B raw material, the anhydride modified polypropylene adhesive resin accounts for 30% of the total weight of the layer B raw material, and the polypropylene elastomer accounts for 70% of the total weight of the layer B raw material; in the layer D raw materials, the low-density polyethylene resin accounts for 60% of the total weight of the layer D raw materials, the tea polyphenol accounts for 20% of the total weight of the layer D raw materials, and the epsilon-polylysine accounts for 20% of the total weight of the layer D raw materials.
3. The tear-resistant antibacterial preservative packaging film blowing process according to claim 1, wherein four extruders of the four-layer co-extrusion film blowing device are single-screw extruders, the temperature of the single-screw extruder corresponding to the raw material of the layer A is 210-220 ℃, the temperature of the single-screw extruder corresponding to the raw material of the layer B is 210-220 ℃, the temperature of the single-screw extruder corresponding to the raw material of the layer C is 210-220 ℃, and the temperature of the single-screw extruder corresponding to the raw material of the layer D is 170-190 ℃; the temperature of the die head is 190-220 ℃.
4. The tear-resistant antibacterial preservative packaging film blowing process according to claim 1, wherein the screw rotation speed of the single screw extruder corresponding to the layer A raw material is 25-35r/min, the screw rotation speed of the single screw extruder corresponding to the layer B raw material is 15-20r/min, the screw rotation speed of the single screw extruder corresponding to the layer C raw material is 15r/min, and the screw rotation speed of the single screw extruder corresponding to the layer D raw material is 30-45r/min; the melt pressure of the single-screw extruder corresponding to the raw material of the layer A is 22-31MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer B is 13-17MPa, the melt pressure of the single-screw extruder corresponding to the raw material of the layer C is 13MPa, and the melt pressure of the single-screw extruder corresponding to the raw material of the layer D is 26-40MPa.
5. The tear-resistant and bacteriostatic fresh-keeping packaging film blowing process according to claim 1, wherein the total thickness of the composite film is 0.15mm; wherein, the thickness of the layer A accounts for 25-35% of the total thickness of the composite film, the thickness of the layer B accounts for 15-20% of the total thickness of the composite film, the thickness of the layer C accounts for 15% of the total thickness of the composite film, and the thickness of the layer D accounts for 30-45% of the total thickness of the composite film.
6. Use of the tear-resistant bacteriostatic freshness-retaining packaging film blowing process according to any one of claims 1-5 in the preparation of food packaging bags.
7. A four-layer co-extrusion film blowing device for the tear-resistant antibacterial preservative packaging film blowing process according to any one of claims 1 to 5, wherein the four-layer co-extrusion film blowing device comprises a co-extrusion film blowing mechanism, a winding mechanism, a film cutting mechanism and a supporting mechanism, the winding mechanism is arranged on one side of the co-extrusion film blowing mechanism, the winding mechanism comprises a winding seat, a rotary driving assembly and winding rollers, the rotary driving assembly is mounted on the winding seat, the winding rollers are provided with two groups, the two groups of winding rollers are respectively mounted at two ends of the rotary driving assembly, and the rotary driving assembly is used for driving the two groups of winding rollers to rotate on the winding seat to perform circular motion; the film cutting mechanism comprises two groups of linear driving assemblies, two groups of telescopic assemblies and two groups of blades, the two groups of linear driving assemblies are respectively installed on one sides of the two groups of winding rollers, the two groups of blades are respectively installed on the two groups of linear driving assemblies through the two groups of telescopic assemblies, the blades are installed in the linear driving assemblies in a shrinkage mode through the telescopic assemblies, and when the linear driving assemblies drive the blades to do linear motion along the radial direction of the winding rollers, the telescopic assemblies drive the blades to pop out of the linear driving assemblies; the supporting mechanism comprises two groups of supporting rods, two groups of hinged seats and two groups of rotary transmission assemblies, the supporting rods are arranged on one side of the winding roller in a rotating mode through the hinged seats, the supporting rods are tightly attached to the rotary driving assemblies, the supporting rods are arranged on the rotary driving assemblies in a rotating mode through the hinged seats, the rotary transmission assemblies are connected with the linear driving assemblies in a driving mode, when the linear driving assemblies drive the blades to move linearly in the radial direction of the winding roller, the rotary driving assemblies drive the supporting rods to stretch rotationally.
8. The four-layer co-extrusion film blowing device according to claim 7, wherein the co-extrusion film blowing mechanism comprises a frame, four plastic extruders and die heads positioned at the upper ends of the four plastic extruders are fixedly arranged at the lower end of the frame, the discharge ends of the four plastic extruders are communicated with the die heads, a herringbone plate and an extrusion roller which are arranged on the frame are sequentially arranged above the die heads, and a plurality of guide rollers are rotatably arranged on one side of the frame; the rotary driving assembly comprises a rotating shaft, a rotating frame and a rotating motor, the rotating shaft is rotatably installed on the winding seat, the rotating motor is fixedly installed on the winding seat through a motor seat, the output end of the rotating motor is in transmission connection with one end of the rotating shaft, the rotating frame is fixedly installed on the rotating shaft, and two groups of winding rollers are respectively rotatably installed at two ends of the rotating frame; and a locking piece is fixedly arranged between the outer side surface of the rotating frame and the inner side wall of the rolling seat.
9. The four-layer co-extrusion film blowing device according to claim 8, wherein the linear driving assembly comprises a double-mover linear motor and a movable base, the double-mover linear motor is fixedly mounted on the rotating frame, the movable base is fixedly mounted on each of two movers of the double-mover linear motor, and the blade is mounted on the movable base through the telescopic assembly; the telescopic assembly comprises a sliding seat and a sliding hole, the sliding hole is formed in the moving seat, the blade and the sliding seat are slidably mounted in the sliding hole, one end of the sliding seat is fixedly connected with the inner side end of the blade, the other end of the sliding seat is provided with a spring, and the tail end of the spring abuts against the end wall of the sliding hole; the middle part of sliding seat is provided with the wedge groove, slidable mounting has the wedge in the wedge groove, the one end fixed mounting of wedge has the ejector pin, the ejector pin slide peg graft in remove in the seat, just the one end of ejector pin extends to remove the outside of seat.
10. The four-layer co-extrusion film blowing device according to claim 9, wherein the rotary transmission assembly comprises an L-shaped connecting rod, a connecting shaft, a sliding block and a sliding groove, the sliding groove is arranged at one side of the supporting rod, the sliding block is slidably arranged in the sliding groove, the L-shaped connecting rod is fixedly arranged on the movable seat, one end of the connecting shaft is fixedly connected with one end of the L-shaped connecting rod, and the other end of the connecting shaft is rotatably connected with the sliding block; one side of the sliding hole is provided with an opening extending to the inner side surface of the moving seat, and the knife edge of the blade is flush with the opening.
CN202310060688.1A 2023-01-19 2023-01-19 Tear-resistant antibacterial fresh-keeping packaging film blowing process, device and application thereof Active CN115805698B (en)

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CN101628645A (en) * 2009-07-30 2010-01-20 浙江大东南包装股份有限公司 Antibacterial BOPP/PP food composite package film and preparation method
CN102825884A (en) * 2012-09-11 2012-12-19 宿迁市金田塑业有限公司 Composite book type sterilizing film and production process thereof
CN105235345A (en) * 2015-11-09 2016-01-13 福州绿帆包装材料有限公司 Blister packaging film for steam sterilization and manufacturing method thereof
CN110306290A (en) * 2019-07-29 2019-10-08 广东工业大学 A kind of preparation method of the anti-oxidant loaded nano tunica fibrosa of edible antibacterial
CN111703158A (en) * 2020-05-29 2020-09-25 安徽国风塑业股份有限公司 Antibacterial biaxially oriented polyvinyl alcohol film and preparation method thereof
CN215797415U (en) * 2021-09-01 2022-02-11 东莞市金顺包装材料有限公司 Automatic roll changing device of film blowing machine
CN115476530A (en) * 2022-08-23 2022-12-16 南昌天高环保科技股份有限公司 Geomembrane with flame retardant effect and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101628645A (en) * 2009-07-30 2010-01-20 浙江大东南包装股份有限公司 Antibacterial BOPP/PP food composite package film and preparation method
CN102825884A (en) * 2012-09-11 2012-12-19 宿迁市金田塑业有限公司 Composite book type sterilizing film and production process thereof
CN105235345A (en) * 2015-11-09 2016-01-13 福州绿帆包装材料有限公司 Blister packaging film for steam sterilization and manufacturing method thereof
CN110306290A (en) * 2019-07-29 2019-10-08 广东工业大学 A kind of preparation method of the anti-oxidant loaded nano tunica fibrosa of edible antibacterial
CN111703158A (en) * 2020-05-29 2020-09-25 安徽国风塑业股份有限公司 Antibacterial biaxially oriented polyvinyl alcohol film and preparation method thereof
CN215797415U (en) * 2021-09-01 2022-02-11 东莞市金顺包装材料有限公司 Automatic roll changing device of film blowing machine
CN115476530A (en) * 2022-08-23 2022-12-16 南昌天高环保科技股份有限公司 Geomembrane with flame retardant effect and preparation method thereof

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