Dairy product packaging cover film and production process thereof

Abstract

The invention relates to a dairy product packaging cover film and a production process thereof. Relates to the technical field of cover film production, according to the dairy product packaging cover film and the production process thereof, a die cutting assembly is arranged in a machine box body, and the upper end of the die cutting assembly penetrates to the upper portion of the machine box body; a negative pressure material storage assembly is installed above the die cutting assembly in a matched mode. A material receiving assembly used for receiving the cover film is further arranged on one side of the negative pressure material storage assembly. According to the die cutting device, during die cutting, the conical suction nozzle is located above a film, after die cutting is conducted on the die cutting base and the die cutting upper die, the conical suction nozzle presses a cover film subjected to die cutting to fall into an inner cavity of the die cutting knife, when the die cutting base is separated from the die cutting upper die, the conical suction nozzle sucks the cover film, and when the material receiving assembly moves to the position below the die cutting upper die, the cover film is separated from the die cutting upper die. And when the conical suction nozzle loses negative pressure, the cover film falls on the material receiving assembly.

Description

Technical Field

[0001] The invention relates to the technical field of cover film production, and in particular to a dairy product packaging cover film and a production process thereof. Background Art

[0002] Dairy product packaging cover film is a vital part of dairy product packaging. It plays an important role in protecting the quality of dairy products, extending the shelf life and improving consumers' usage experience.

[0003] The cover film has good barrier properties; it can effectively block the intrusion of oxygen, water vapor and odor, and prevent dairy products from oxidation, deterioration, moisture and odor contamination. For example, a multi-layer composite structure is used, in which the EVOH or PVDC layer can provide excellent oxygen barrier properties to ensure the freshness of dairy products.

[0004] During the processing of the existing cover film, the blown film is folded into multiple layers, and then placed into a punching die for punching and forming; the thickness of the folded film is relatively large, the punching die is deep, and the film also has a certain elasticity. When punching a thicker film, there will be a certain elasticity; resulting in a certain adhesion between the punched cover film and the film body; and the cover film that has entered the punching die is not easy to take out. Summary of the invention

[0005] Technical issues to be solved

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, meet the actual needs, and provide a dairy product packaging cover film and its production process, which is processed by single-layer die cutting; and the die cutting assembly has multiple die cutting knives, which can simultaneously die cut multiple cover films, and the depth of the die cutting knives is shallow, and the cover films can be easily taken out by using negative pressure. To solve the technical problems raised by the above background technology.

[0007] Technical Solution

[0008] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0009] A dairy product packaging cover film is provided, which is circular and has a thickness of not less than 2 mm; the middle of the cover film is convex upward and is arranged in an arc shape.

[0010] A processing technology for a dairy product packaging cover film comprises the following steps:

[0011] S1. Raw material selection: select one or more of polyethylene, polypropylene, and polyester materials, and mix and stir the above raw materials;

[0012] S2. Co-extrusion blown film: Through a multi-layer co-extrusion blown film device, the plastic melt of the above raw materials is extruded simultaneously to form a multi-layer film structure, and a film is formed on a cooling roller;

[0013] S3. Printing: Use gravure printing or flexographic printing equipment to print product information, patterns and logos on the surface of the film; in order to ensure printing quality and food safety, use inks that meet food contact requirements;

[0014] S4. Coating treatment: coating the film with polyvinylidene chloride or ethylene-vinyl alcohol copolymer to form a coating; to enhance the barrier properties of the film and improve the moisture and oxygen penetration resistance;

[0015] S5. Slitting and film making: According to the required size, the film is slit into suitable widths and made into the shape of the cover film through the slitting equipment;

[0016] S6. Quality inspection: including appearance inspection, dimension measurement, heat seal strength test, and barrier performance test to ensure that the cover film meets the quality standards; to ensure the production of high-quality cover films that meet the requirements of dairy product packaging;

[0017] S5 in the above step. The film cutting is completed by the die-cutting component, the negative pressure storage component and the receiving component with the die-cutting, receiving and unloading operations;

[0018] The die-cutting assembly is arranged inside the chassis, and the upper end of the die-cutting assembly penetrates to the top of the chassis; a negative pressure material storage assembly is installed above the die-cutting assembly; and a material receiving assembly for receiving the cover film is also provided on one side of the negative pressure material storage assembly.

[0019] Preferably, the die-cutting assembly includes a servo motor, which is transmission-connected to a pulley group; the servo motor and the pulley group are cooperatively mounted on a motor base, wherein a gear shaft is cooperatively mounted on the pulley group, and the gear shaft is meshingly connected to an idler wheel; the idler wheel is meshingly connected to a driving gear; a cam group is coaxially arranged on the driving gear, and a pushing seat is provided above the cam group; the upper end of the pushing seat is slidably connected to the chassis, and a die-cutting seat is fixed on the top of the pushing seat.

[0020] Preferably, springs are provided at the four corners of the bottom of the push seat, and the lower end of the spring is fixed to the upper end of the mounting seat; the rotating shaft on which the driving gear and the cam group are installed is connected to the mounting seat through a seat bearing; the idler wheel is installed on the rotating shaft through a fitting, and the rotating shaft and the mounting seat are connected through a seat bearing.

[0021] Preferably, a plurality of die-cutting knives are arranged in a rectangular array above the die-cutting seat; the die-cutting knives are arranged in a circular shape and have a cavity in the middle for facilitating the molding of the film cover.

[0022] Preferably, the negative pressure material storage assembly comprises a fixed seat connected to the frame body, a die-cutting upper die is fixed on the inner side of the fixed seat, and a plurality of negative pressure suction nozzles are embedded on the die-cutting upper die; and a die-cutting knife corresponds to the lower side of each negative pressure suction nozzle;

[0023] The plurality of negative pressure nozzles are connected to each other through a negative pressure tube; the negative pressure tube is also connected to a negative pressure pump.

[0024] Preferably, the plane size of the die-cutting upper die is larger than the plane size of the die-cutting seat; and guide rods are also provided on both sides of the bottom of the die-cutting upper die to facilitate the film to pass through.

[0025] Preferably, the material receiving assembly comprises two rhombus hinge mechanisms, the rhombus hinge mechanisms having four movable nodes, two of which are movably connected to two fixed shafts; one of the other two nodes is movably connected to the connecting seat, and the other node is movably connected to the guide sleeve via a rotating shaft;

[0026] A driving rod is slidably connected inside the guide sleeve, and the driving rod is also movably connected to the fixed shaft; a receiving hopper is movably connected above the two driving rods.

[0027] Preferably, the receiving hopper is arranged in an L shape, and the movable node connecting the receiving hopper and the driving rod is located at 1 / 3 of the bottom of the receiving hopper; a movable wheel is also provided above the driving rod close to the side of the fixed seat, and the movable wheel is movably connected to the support arm, and the upper end of the support arm is connected to the fixed seat through a rotating shaft.

[0028] Preferably, a main control console is provided on one side of the chassis, and a frame is fixed above the chassis, on which a plurality of film driving components are mounted; a film tensioning assembly is fixed above one end of the chassis close to the main control console; and a winding assembly is mounted on one end of the chassis away from the film tensioning assembly.

[0029] Beneficial effects:

[0030] A. In the present invention, since a plurality of die-cutting knives are arranged in a rectangular array above the die-cutting seat; and the die-cutting knives are arranged in a circular shape, and there is a cavity in the middle for facilitating the film cover molding, the cover film can be quickly die-cut and molded during die-cutting, and adhesion will not occur, thereby ensuring the die-cutting effect of the cover film;

[0031] B. In the present invention, during die-cutting, the conical suction nozzle is located above the film. After the die-cutting seat and the die-cutting upper die are die-cut, the conical suction nozzle presses the die-cut cover film to fall into the inner cavity of the die-cutting knife. When the die-cutting seat and the die-cutting upper die are separated, the conical suction nozzle sucks up the cover film. When the receiving component moves to the bottom of the die-cutting upper die, the conical suction nozzle loses negative pressure, and the cover film falls on the receiving component.

[0032] C. In the present invention, when the die-cutting seat and the die-cutting upper die are closed, the upper and lower nodes of the diamond hinge mechanism are contracted, and the driving rod is driven to withdraw backward along the guide sleeve. While withdrawing, the receiving hopper will turn over under the push of the movable wheel, and the cover film in the receiving hopper will be dumped into the finished product box below the receiving hopper, thereby completing the collection of the finished products;

[0033] D. In the present invention, since the movable node connecting the receiving hopper and the driving rod is located at 1 / 3 of the bottom of the receiving hopper; when the die-cutting seat and the upper die of the die-cutting die are separated and the upper and lower nodes of the diamond hinge mechanism are relatively unfolded, the receiving hopper and the movable wheel are separated and reset under the weight of the receiving hopper itself, so that the receiving hopper can be placed flat on the driving rod to facilitate repeated reception of the covering film. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0035] Figure 2 For the present invention Figure 1 The main view;

[0036] Figure 3 For the present invention Figure 1 The right side structural diagram of ;

[0037] Figure 4 For the present invention Figure 1 Schematic diagram of the rear structure;

[0038] Figure 5 For the present invention Figure 1 Schematic diagram of some structures;

[0039] Figure 6 For the present invention Figure 5 Schematic diagram of the bottom structure;

[0040] Figure 7 For the present invention Figure 6 Schematic diagram from another perspective;

[0041] Figure 8 For the present invention Figure 2 A magnified schematic diagram of point A;

[0042] Fig. 9 For the present invention Figure 3 An enlarged schematic diagram of point B;

[0043] Fig.10 For the present invention Figure 5 An enlarged schematic diagram of point C;

[0044] Fig.11 It is a schematic diagram of the structure of the negative pressure nozzle in the present invention.

[0045] In the figure: 1-main control console, 2-chassis, 3-die cutting assembly, 4-frame, 5-film driving component, 6-winding assembly, 7-negative pressure material storage assembly, 8-film tensioning assembly, 9-material receiving assembly;

[0046] 31-servo motor, 32-pulley set, 33-gear shaft, 34-idle wheel, 35-driving gear, 36-cam set, 37-spring, 38-pushing seat, 39-die cutting seat, 310-mounting seat, 311-die cutting knife;

[0047] 71-fixed seat, 72-die-cutting upper die, 73-negative pressure suction nozzle, 74-negative pressure tube, 75-guide rod;

[0048] 731-fixed tube, 732-conical suction nozzle, 733-ejection spring, 734-electromagnet;

[0049] 91-diamond hinge mechanism, 92-driving rod, 93-guide sleeve, 94-receiving hopper, 95-movable wheel, 96-connecting seat, 97-fixed shaft. DETAILED DESCRIPTION

[0050] A dairy product packaging cover film is provided, which is circular and has a thickness of not less than 2 mm; the middle of the cover film is convex upward and is arranged in an arc shape.

[0051] A processing technology for a dairy product packaging cover film comprises the following steps:

[0052] S1. Raw material selection: select one or more of polyethylene, polypropylene, and polyester materials, and mix and stir the above raw materials;

[0053] S2. Co-extrusion blown film: Through a multi-layer co-extrusion blown film device, the plastic melt of the above raw materials is extruded simultaneously to form a multi-layer film structure, and a film is formed on a cooling roller;

[0054] S3. Printing: Use gravure printing or flexographic printing equipment to print product information, patterns and logos on the surface of the film; in order to ensure printing quality and food safety, use inks that meet food contact requirements;

[0055] S4. Coating treatment: coating the film with polyvinylidene chloride or ethylene-vinyl alcohol copolymer to form a coating; to enhance the barrier properties of the film and improve the moisture and oxygen penetration resistance;

[0056] S5. Slitting and film making: According to the required size, the film is slit into suitable widths and made into the shape of the cover film through the slitting equipment;

[0057] S6. Quality inspection: including appearance inspection, dimension measurement, heat seal strength test, and barrier performance test to ensure that the cover film meets the quality standards; to ensure the production of high-quality cover films that meet the requirements of dairy product packaging;

[0058] Please refer to the attached Figure 1-4 , S5 in the above step. The film is cut by the die-cutting component 3, the negative pressure storage component 7 and the receiving component 9 to complete the die-cutting, receiving and unloading operations;

[0059] The die-cutting assembly 3 is arranged inside the chassis 2, and the upper end of the die-cutting assembly 3 passes through the top of the chassis 2; a negative pressure material storage assembly 7 is installed above the die-cutting assembly 3; one side of the negative pressure material storage assembly 7 is also provided with a material receiving assembly 9 for receiving the cover film.

[0060] Furthermore, the die-cutting assembly 3 includes a servo motor 31, which is transmission-connected to a pulley group 32; the servo motor 31 and the pulley group 32 are both mounted on a motor base, wherein a gear shaft 33 is mounted on the pulley group 32, and the gear shaft 33 is meshingly connected to an idler wheel 34; the idler wheel 34 is meshingly connected to a driving gear 35; the driving gear 35 is coaxially provided with a cam group 36, and a pushing seat 38 is provided above the cam group 36; the upper end of the pushing seat 38 is slidably connected in the chassis 2, and a die-cutting seat 39 is fixed on the top of the pushing seat 38.

[0061] According to the arrangement of the above scheme, when die-cutting the film, the servo motor 31 drives the pulley group 32 to rotate, the coaxially arranged gear shaft 33 drives the driving gear 35 to rotate through the idler gear 34, and the cam group 36 coaxially arranged with the driving gear 35 starts to rotate, and each time it rotates a cycle, it pushes the push seat 38 upward, so that the die-cutting seat 39 installed on the top of the push seat 38 is closed with the die-cutting upper die 72, and the film is die-cut by the die-cutting knife 311;

[0062] Since a plurality of die-cutting knives 311 are arranged in a rectangular array above the die-cutting seat 39, and the die-cutting knives 311 are arranged in a circular shape and have a cavity in the middle for facilitating film cover molding, the cover film can be quickly die-cut during die-cutting without adhesion, thereby ensuring the die-cutting effect of the cover film.

[0063] Furthermore, springs 37 are provided at the four corners of the bottom of the pushing seat 38, and the lower end of the spring 37 is fixed to the upper end of the mounting seat 310; the rotating shaft installed by the driving gear 35 and the cam group 36 is connected to the mounting seat 310 through a seat bearing; the idler wheel 34 is installed on the rotating shaft through cooperation, and the rotating shaft and the mounting seat 310 are connected through a seat bearing.

[0064] With the arrangement of the above scheme, when the cam group 36 pushes the push seat 38, the spring 37 at the bottom of the push seat 38 limits the push seat 38 and plays a certain buffering role, ensuring that the push seat 38 can move up and down stably.

[0065] Furthermore, the negative pressure material storage assembly 7 includes a fixed seat 71 connected to the frame body 4, a die-cutting upper die 72 is fixed on the inner side of the fixed seat 71, and a plurality of negative pressure suction nozzles 73 are embedded on the die-cutting upper die 72; each negative pressure suction nozzle 73 corresponds to a die-cutting knife 311 below;

[0066] The plurality of negative pressure nozzles 73 are connected to each other via a negative pressure tube 74 ; the negative pressure tube 74 is also connected to a negative pressure pump.

[0067] With the arrangement of the above scheme, the cover film after die-cutting will fall into the cavity in the middle of the die-cutting knife 311. After the negative pressure gas is introduced into the negative pressure suction nozzle 73 connected to the negative pressure tube 74, the cover film in the cavity of the die-cutting knife 311 is adsorbed. There is no need for manual material removal, which greatly saves labor intensity.

[0068] Furthermore, the planar dimension of the die-cutting upper die 72 is larger than the planar dimension of the die-cutting seat 39; guide rods 75 are also provided on both sides of the bottom of the die-cutting upper die 72 to facilitate the film to pass through.

[0069] Through the arrangement of the above-mentioned scheme, the arrangement of the guide rod 75 can ensure that the film is attached to the bottom of the die-cutting upper die 72, which is convenient for the closing and die-cutting of the die-cutting seat 39 and the die-cutting upper die 72.

[0070] Please refer to the attached Fig.11 Further, the negative pressure suction nozzle 73 includes a fixed tube 731 embedded with the die-cutting upper die 72, a T-tube is slidably connected inside the fixed tube 731, and a conical suction nozzle 732 is installed at the bottom of the T-tube; an electromagnet 734 is installed at the lower end of the fixed tube 731; and an ejection spring 733 is also provided between the conical suction nozzle 732 and the electromagnet 734;

[0071] Under normal conditions, the electromagnet 734 is in a de-energized state; the bottom of the conical suction nozzle 732 is flush with or protrudes from the lower edge of the guide rod 75; and the diameter of the bottom of the conical suction nozzle 732 is smaller than the inner diameter of the die cutter 311.

[0072] With the arrangement of the above scheme, during die-cutting, the conical suction nozzle 732 is located above the film. After the die-cutting seat 39 and the die-cutting upper die 72 are die-cut, the conical suction nozzle 732 presses the die-cut cover film to fall into the inner cavity of the die-cutting knife 311. When the die-cutting seat 39 and the die-cutting upper die 72 are separated, the conical suction nozzle 732 sucks up the cover film. When the receiving component 9 moves to the bottom of the die-cutting upper die 72, the conical suction nozzle 732 loses negative pressure, and the cover film falls on the receiving component 9.

[0073] Then the electromagnet 734 is energized, the conical suction nozzle 732 compresses the ejection spring 733 and is sucked up. At this time, the conical suction nozzle 732 is located above the film. Then the winding assembly 6 can rotate to wind the film and place the film to be die-cut back under the die-cutting upper mold 72.

[0074] See also Figure 8 and Fig.10 Further, the material receiving assembly 9 includes two rhombus hinge mechanisms 91, and the rhombus hinge mechanisms 91 have four movable nodes, two of which are movably connected to two fixed shafts 97; one of the other two nodes is movably connected to the connecting seat 96, and the other node is movably connected to the guide sleeve 93 through the rotating shaft;

[0075] A driving rod 92 is slidably connected inside the guide sleeve 93 , and the driving rod 92 is also movably connected to a fixed shaft 97 ; a receiving hopper 94 is movably connected above the two driving rods 92 .

[0076] With the arrangement of the above scheme, when the die-cutting seat 39 and the die-cutting upper die 72 are closed, the upper and lower nodes of the diamond hinge mechanism 91 are contracted, and the driving rod 92 is driven to withdraw backward along the guide sleeve 93. While withdrawing, the receiving hopper 94 is turned over under the push of the movable wheel 95, and the cover film in the receiving hopper 94 is dumped into the finished product box below the receiving hopper 94, thereby completing the collection of the finished products;

[0077] After die-cutting is completed, the die-cutting seat 39 is separated from the die-cutting upper die 72, and the upper and lower nodes of the diamond hinge mechanism 91 are relatively unfolded, driving the driving rod 92 to move along the guide sleeve 93 to the bottom of the die-cutting upper die 72 until the receiving hopper 94 can receive the cover film after die-cutting.

[0078] Furthermore, the receiving hopper 94 is arranged in an L shape, and the movable node connecting the receiving hopper 94 and the driving rod 92 is located at 1 / 3 of the bottom of the receiving hopper 94; a movable wheel 95 is also provided above the driving rod 92 on the side close to the fixed seat 71, and the movable wheel 95 is movably connected to the support arm, and the upper end of the support arm is connected to the fixed seat 71 through a rotating shaft.

[0079] With the arrangement of the above scheme, since the movable node connecting the receiving hopper 94 and the driving rod 92 is located at 1 / 3 of the bottom of the receiving hopper 94; when the die-cutting seat 39 and the upper die-cutting die 72 are separated and the upper and lower nodes of the diamond hinge mechanism 91 are relatively expanded, the receiving hopper 94 and the movable wheel 95 are separated and reset under the weight of the receiving hopper 94 itself, so that the receiving hopper 94 can be placed flat on the driving rod 92 to facilitate repeated reception of the covering film.

[0080] Please refer to the attached Figure 1-7 Furthermore, a main control console 1 is provided on one side of the chassis 2, and a frame body 4 is fixed above the chassis 2, on which a plurality of film driving components 5 are installed; a film tensioning assembly 8 is fixed above one end of the chassis 2 close to the main control console 1; a winding assembly 6 is installed at one end of the chassis 2 away from the film tensioning assembly 8.

[0081] With the arrangement of the above scheme, the film is transmitted through multiple film driving components 5 and then tensioned by the film tensioning assembly 8, thereby ensuring the flatness of the film to facilitate subsequent die-cutting and forming. The waste film after die-cutting is rolled up by the winding assembly 6.

[0082] How it works

[0083] In the present invention, the film is transmitted through a plurality of film driving components 5, and then tensioned by a film tensioning assembly 8, thereby ensuring the flatness of the film, so as to facilitate the subsequent die-cutting and forming. When the film is die-cut, the servo motor 31 drives the pulley group 32 to rotate, and the coaxially arranged gear shaft 33 drives the driving gear 35 to rotate through the idler wheel 34, and the cam group 36 coaxially arranged with the driving gear 35 starts to rotate. After each rotation cycle, the push seat 38 is pushed upward, so that the die-cutting seat 39 installed on the top of the push seat 38 is closed with the die-cutting upper die 72, and the film is die-cut by the die-cutting knife 311;

[0084] Since a plurality of die cutting knives 311 are arranged in a rectangular array above the die cutting seat 39, and the die cutting knives 311 are arranged in a circular shape and have a cavity in the middle for facilitating the film cover molding, the cover film can be quickly die cut and molded during die cutting without adhesion, thereby ensuring the die cutting effect of the cover film;

[0085] During die-cutting, the conical suction nozzle 732 is located above the film. After the die-cutting seat 39 and the die-cutting upper die 72 are die-cut, the conical suction nozzle 732 presses the die-cut cover film to fall into the inner cavity of the die-cutting knife 311. When the die-cutting seat 39 and the die-cutting upper die 72 are separated, the conical suction nozzle 732 sucks up the cover film. When the receiving component 9 moves to the bottom of the die-cutting upper die 72, the conical suction nozzle 732 loses negative pressure, and the cover film falls on the receiving component 9.

[0086] Then the electromagnet 734 is energized, the conical suction nozzle 732 compresses the ejection spring 733 and is sucked up, and the conical suction nozzle 732 is now located above the film, and then the winding assembly 6 can rotate to wind up the film, and the film to be die-cut is placed under the die-cutting upper die 72 again;

[0087] When the die-cutting seat 39 and the die-cutting upper die 72 are closed, the upper and lower nodes of the diamond hinge mechanism 91 are contracted, and the driving rod 92 is driven to withdraw backward along the guide sleeve 93. While withdrawing, the receiving hopper 94 is turned over by the push of the movable wheel 95, and the cover film in the receiving hopper 94 is dumped into the finished product box below the receiving hopper 94, thereby completing the collection of the finished products;

[0088] After die-cutting is completed, the die-cutting seat 39 is separated from the die-cutting upper die 72, and the upper and lower nodes of the diamond hinge mechanism 91 are relatively unfolded, and the driving rod 92 is driven to move along the guide sleeve 93 to the bottom of the die-cutting upper die 72 until the receiving hopper 94 can receive the cover film after die-cutting;

[0089] Since the movable node connecting the receiving hopper 94 and the driving rod 92 is located at 1 / 3 of the bottom of the receiving hopper 94; when the die-cutting seat 39 and the upper die-cutting die 72 are separated and the upper and lower nodes of the diamond hinge mechanism 91 are relatively expanded, the receiving hopper 94 is separated from the movable wheel 95 and will be reset under the weight of the receiving hopper 94 itself, so that the receiving hopper 94 can be placed flat on the driving rod 92 to facilitate repeated reception of the covering film.

[0090] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A dairy product packaging cover film, characterized in that: The cover film is arranged in a circular shape, and the thickness of the cover film is not less than 2 mm; the middle of the cover film is convex upward and arranged in an arc shape.

2. A processing technology for the dairy product packaging cover film according to claim 1, characterized in that: The following steps are involved: S1. Raw material selection: select one or more of polyethylene, polypropylene, and polyester materials, and mix and stir the above raw materials; S2. Co-extrusion blown film: Through a multi-layer co-extrusion blown film device, the plastic melt of the above raw materials is extruded simultaneously to form a multi-layer film structure, and a film is formed on a cooling roller; S3. Printing: Use gravure printing or flexographic printing equipment to print product information, patterns and logos on the surface of the film; in order to ensure printing quality and food safety, use inks that meet food contact requirements; S4. Coating treatment: coating the film with polyvinylidene chloride or ethylene-vinyl alcohol copolymer to form a coating; To enhance the barrier properties of the film and improve the moisture and oxygen penetration resistance; S5. Slitting and film making: According to the required size, the film is slit into suitable widths and made into the shape of the cover film through the slitting equipment; S6. Quality inspection: including appearance inspection, dimension measurement, heat seal strength test, and barrier performance test to ensure that the cover film meets the quality standards; To ensure the production of high-quality cover films that meet the requirements of dairy product packaging; S5 in the above step. The film cutting is completed by the die-cutting component (3), the negative pressure storage component (7) and the material receiving component (9) in cooperation with the die-cutting, receiving and unloading operations; The die-cutting assembly (3) is arranged inside the chassis (2), and the upper end of the die-cutting assembly (3) passes through the upper part of the chassis (2); a negative pressure material storage assembly (7) is installed above the die-cutting assembly (3); and a material receiving assembly (9) for receiving the cover film is also provided on one side of the negative pressure material storage assembly (7).

3. The processing technology of the dairy product packaging cover film according to claim 2, characterized in that: The die-cutting assembly (3) comprises a servo motor (31), which is in transmission connection with a pulley group (32); the servo motor (31) and the pulley group (32) are both mounted on a motor base, wherein a gear shaft (33) is mounted on the pulley group (32), and the gear shaft (33) is meshingly connected with an idler wheel (34); the idler wheel (34) is meshingly connected with a driving gear (35); a cam group (36) is coaxially arranged on the driving gear (35), and a push seat (38) is arranged above the cam group (36); the upper end of the push seat (38) is slidably connected in the chassis (2), and a die-cutting seat (39) is fixed on the top of the push seat (38).

4. The processing technology of the dairy product packaging cover film according to claim 3, characterized in that: Springs (37) are provided at the four corners of the bottom of the pushing seat (38), and the lower end of the spring (37) is fixed to the upper end of the mounting seat (310); the rotating shaft on which the driving gear (35) and the cam group (36) are installed is connected to the mounting seat (310) through a seat bearing; the idler wheel (34) is installed on the rotating shaft through a seat bearing, and the rotating shaft is connected to the mounting seat (310) through a seat bearing.

5. The processing technology of the dairy product packaging cover film according to claim 3, characterized in that: A plurality of die-cutting knives (311) are arranged in a rectangular array above the die-cutting seat (39); the die-cutting knives (311) are arranged in a circular shape and have a cavity in the middle for facilitating film cover molding.

6. The processing technology of the dairy product packaging cover film according to claim 2, characterized in that: The negative pressure material storage assembly (7) comprises a fixed seat (71) connected to the frame body (4), a die-cutting upper die (72) is fixed on the inner side of the fixed seat (71), and a plurality of negative pressure suction nozzles (73) are embedded on the die-cutting upper die (72); a die-cutting knife (311) corresponds to the lower side of each negative pressure suction nozzle (73); The plurality of negative pressure suction nozzles (73) are connected to each other via a negative pressure tube (74); the negative pressure tube (74) is also connected to a negative pressure pump.

7. The processing technology of the dairy product packaging cover film according to claim 6, characterized in that: The plane size of the die-cutting upper die (72) is larger than the plane size of the die-cutting seat (39); guide rods (75) are also provided on both sides of the bottom of the die-cutting upper die (72) to facilitate the film to pass through.

8. The processing technology of the dairy product packaging cover film according to claim 2, characterized in that: The material receiving assembly (9) comprises two rhombus hinge mechanisms (91), wherein the rhombus hinge mechanisms (91) have four movable nodes, wherein two movable nodes are movably connected to two fixed shafts (97); one of the other two nodes is movably connected to a connecting seat (96), and the other node is movably connected to a guide sleeve (93) via a rotating shaft; A driving rod (92) is slidably connected inside the guide sleeve (93), and the driving rod (92) is also movably connected to the fixed shaft (97); a receiving hopper (94) is movably connected above the two driving rods (92).

9. The processing technology of the dairy product packaging cover film according to claim 8, characterized in that: The receiving hopper (94) is arranged in an L shape, and the movable node connecting the receiving hopper (94) and the driving rod (92) is located at 1 / 3 of the bottom of the receiving hopper (94); a movable wheel (95) is also arranged above the driving rod (92) on the side close to the fixed seat (71), and the movable wheel (95) is movably connected to the support arm, and the upper end of the support arm is connected to the fixed seat (71) through a rotating shaft.

10. The processing technology of the dairy product packaging cover film according to claim 2, characterized in that: A main control console (1) is provided on one side of the chassis (2); a frame (4) is fixed above the chassis (2), and a plurality of film driving components (5) are mounted on the frame (4); a film tensioning assembly (8) is fixed above one end of the chassis (2) close to the main control console (1); and a winding assembly (6) is mounted on one end of the chassis (2) away from the film tensioning assembly (8).

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