A high-precision laser minimally invasive functional film and its manufacturing method

Abstract

The present invention provides a high-precision laser minimally invasive functional film, comprising a film body; a gold pull wire is provided on the surface of the film body; the film body is provided with an indentation, the indentation is located on one side or both sides of the gold pull wire, and one end of the indentation extends to the gold pull wire. Under the premise of ensuring the sealing of the film packaging, the present invention uses a laser to create a cut on the surface of the film, but does not cut through it. At the same time, in addition to the cut, the film does not cause other appearance defects caused by heat such as whitening, yellowing, curling, etc. In order to solve the terminal application, the film is first sprayed with code (online positioning block spraying) and then laser cut, and the cigarette film with positioning block and laser cut features is rolled into a roll, thereby solving the production efficiency problem of terminal application. The present invention completely solves the problem that the film is not easy to fall off after the gold pull wire is torn off in tobacco special-shaped packaging. On the one hand, the cost is not increased much, and at the same time, the original product design concept is guaranteed without causing visual impact.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco, and in particular to a high-precision laser minimally invasive functional film and a manufacturing method thereof. Background Art

[0002] After more than 40 years of development, BOPP cigarette film has seen rapid advancements in packaging methods. Traditional cigarettes, especially small packs, have an access port located at the top of the box. Typically, a gold drawstring allows for easy removal of the film directly from the access port. However, with some unusually shaped cigarette packaging, such as those that open from the side, improperly pulling the drawstring can result in a large area of ​​the film covering the box, preventing it from being opened.

[0003] The tobacco industry currently has two main methods for addressing this issue. One is to use parallel double gold pull cords, as used in Hunan China Tobacco's Furong King pilot cigarettes. The other is to manually cut (cut through) the film with a knife and then affix a self-adhesive label to the cut to ensure the package's airtightness. The disadvantages of double gold pull cords are high cost (equipment modification is required, production efficiency is low, and consumables are high). If the direction of the gold pull cords is not controlled properly, the packaging film may still be difficult to remove in some areas, which does not completely solve the problem of opening the film packaging. Manually making the cut and affixing the self-adhesive label is also costly, inefficient, and difficult to control quality. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a high-precision laser minimally invasive functional film and a manufacturing method thereof. The prepared BOPP cigarette film is easy to tear and is particularly suitable for the packaging of special-shaped cigarette boxes.

[0005] To achieve the above-mentioned object, the present invention provides a high-precision laser minimally invasive functional film, comprising a film body;

[0006] A gold wire is provided on the surface of the membrane body;

[0007] The membrane body is provided with an indentation, the indentation is located on one side or both sides of the gold pull wire, and one end of the indentation extends to the gold pull wire.

[0008] The present invention has no particular limitation on the material of the film body, and any packaging film well known to those skilled in the art can be used.

[0009] Preferably, in the present invention, the film body is a BOPP film.

[0010] Preferably, the film body of the present invention is a BOPP three-layer co-extruded polypropylene film, which is divided into a three-layer structure of an upper layer, a middle layer and a lower layer.

[0011] The present invention has no particular limitation on the source of the BOPP film, which may be commercially available or self-made.

[0012] The upper layer is preferably extruded by blending the following raw materials: ethylene-propylene-butadiene terpolymer or ethylene-propylene binary copolymer heat-sealing functional masterbatch, silicone polymer, and anti-blocking agent.

[0013] In the present invention, the content of the above raw materials can be adjusted according to the film properties, and the present invention has no special limitation on this.

[0014] The present invention has no particular limitation on the specific types of the silicone polymer and anti-adhesive agent, and they may be silicone polymers and anti-adhesive agents well known to those skilled in the art.

[0015] The middle layer is preferably extruded by blending the following raw materials: homopolypropylene, petroleum resin, and antistatic agent.

[0016] In the present invention, the content of the above raw materials can be adjusted according to the film properties, and the present invention has no special limitation on this.

[0017] The present invention has no particular limitation on the specific types of the petroleum resin and antistatic agent, and they may be petroleum resins and antistatic agents well known to those skilled in the art.

[0018] The lower layer is preferably extruded by blending the following raw materials: ethylene-propylene-butadiene terpolymer or ethylene-propylene binary copolymer heat-sealing functional masterbatch and an anti-blocking agent.

[0019] In the present invention, the content of the above raw materials can be adjusted according to the film properties, and the present invention has no special limitation on this.

[0020] The present invention has no particular limitation on the specific type of the anti-adhesion agent, and the anti-adhesion agent may be any anti-adhesion agent well known to those skilled in the art.

[0021] In the present invention, the thickness of the membrane body is preferably 18 to 30 μm, more preferably 22 μm.

[0022] In the present invention, a gold wire is provided on the surface of the membrane body.

[0023] The present invention has no particular limitation on the material of the gold wire, and the gold wire may be any gold wire well known to those skilled in the art.

[0024] The present invention has no special limitation on the position of the gold wire, which divides the membrane body into two parts, left and right.

[0025] Preferably, in the present invention, when the film body is packaged on the surface of a product, the gold wire is arranged circumferentially around the product.

[0026] The present invention has no special limitation on the arrangement of the gold wire, including but not limited to hot pressing and other methods.

[0027] In the present invention, the membrane body is provided with an indentation, the indentation is located on one side or both sides of the gold pull wire, and one end of the indentation extends to the gold pull wire.

[0028] That is, the gold pulling wire divides the membrane body into two parts, the left part and / or the right part of the membrane body is provided with an indentation, and one end of the indentation extends to intersect with the gold pulling wire.

[0029] In the present invention, the indentation refers to a mark formed on the membrane body without penetrating the membrane body, so as to ensure the airtightness of the film.

[0030] Preferably, in the present invention, the indentation is a linear indentation.

[0031] Preferably, the indentation is arranged perpendicular to the gold wire.

[0032] Preferably, in the present invention, two indentations are symmetrically arranged on both sides of the gold wire.

[0033] Preferably, in the present invention, two indentations perpendicular to the gold pulling wire are symmetrically arranged on both sides of the gold pulling wire.

[0034] The direction of the indentations is perpendicular to the gold pull wire and distributed on both sides, making it easy to tear the entire film when the gold pull wire is pulled apart.

[0035] Preferably, the indentation of the present invention is a laser incision indentation.

[0036] Preferably, the length of the indentation is 8 to 20 mm.

[0037] Preferably, the depth of the indentation is 30% to 80% of the thickness of the membrane body.

[0038] In the present invention, the indentation does not cut through the film, thereby ensuring the airtightness after packaging and ensuring that the quality of the cigarettes is not affected.

[0039] The functional film of the present invention can be a sheet film (for manual packaging of a single sheet) or a roll film (for automatic packaging on a cigarette packaging machine), and the present invention has no special limitation on this.

[0040] When it is a single film, the schematic diagram of the functional film is as follows Figure 1 As shown, it includes a membrane body 1, a gold wire 2, and an indentation 3.

[0041] When it is a roll film, the schematic diagram of the functional film is as follows Figure 2 As shown, it includes a film roll body 2-1, a gold pull wire 2-2, an indentation 2-3, a roll core 2-4, and a positioning block 2-5.

[0042] The present invention provides an apparatus for preparing the above-mentioned functional film, comprising:

[0043] Unwinding device, coding device, coding recognition device, laser.

[0044] Wherein, the unwinding device is used to place the film body.

[0045] The coding device is used to perform online coding at the designed position of the film. The purpose of coding is to provide positioning during subsequent packaging on a cigarette packaging machine.

[0046] The inkjet code recognition device is used to recognize the inkjet code and provide a signal for the next laser operation.

[0047] After receiving the signal feedback from the inkjet code recognition device, the laser performs an indentation and cutting operation on the film.

[0048] Preferably, the bottom material of the laser cut that contacts the film is a smooth white or gray ceramic plate or ceramic roller, which can better protect the film's appearance from damage caused by the instantaneous high temperature cutting of the laser and avoid yellowing, whitening, fogging, and the like at the edge of the film.

[0049] BOPP film for cigarettes is highly transparent, with a haze index of only 1%. When a laser of a certain intensity strikes the film, if the bottom material where the film contacts is not selected properly, it can cause quality defects in the film's appearance, such as yellowing, whitishness, and fogging at the film edge. The present invention uses a smooth ceramic plate or ceramic roller as the bottom material where the film contacts the laser operation, especially white or gray ceramic, for better results. Furthermore, the thickness of the cigarette film is generally 18 to 22 μm, and the depth of the laser cut on the film is generally 8 to 15 μm. The barrier properties at the cut location, especially the water barrier properties, do not exceed 10 g / m 2 .24hr (test conditions 38℃(100℉), 90%RH), which places high demands on the setting of laser intensity and the stability of film thickness.

[0050] When the film is a roll film, the device further includes a winding device.

[0051] The winding device is used to neatly wind up the film after the holes are punched.

[0052] The schematic diagram of the device is shown in Figure 3 As shown, it includes: an unwinding device 1, a coding device 2, a coding recognition device 3, a laser 4, and a winding device 5.

[0053] The present invention provides a method for preparing the above-mentioned functional film, comprising:

[0054] A) Place the film body on the unwinding shaft;

[0055] B) Spray the positioning code on the membrane body;

[0056] C) Identify the positioning code and feed the signal back to the laser;

[0057] D) Laser cutting.

[0058] In the present invention, the size of the film body placed on the unwinding shaft is preferably 22 μm*250 mm.

[0059] When the functional film is a roll film, the preparation method specifically includes:

[0060] A) Place the film body on the unwinding shaft;

[0061] B) Spray the positioning code on the membrane body;

[0062] C) Identify the positioning code and feed the signal back to the laser;

[0063] D) Laser cutting;

[0064] E) Rolling.

[0065] When the functional film is a sheet film, the preparation method further includes slicing.

[0066] The sectioning may be after step A), after step B), after step C) or after step D).

[0067] Preferably, in the present invention, the production speed of the functional film is 20 to 100 m / min.

[0068] Preferably, the frequency of the laser cutting is 15% to 70%.

[0069] In the present invention, the film may be optionally surface treated.

[0070] Preferably, in the present invention, whether corona treatment is required to enhance the surface tension of the film and thus enhance the adhesion of the ink is selected according to the adhesion strength of the ink used in the positioning block.

[0071] In the present invention, the gold wire can be provided before the film is unwound, or before step B).

[0072] The present invention has no special limitation on the arrangement of the gold wire, including but not limited to processes such as hot pressing.

[0073] The functional film provided by the present invention can be applied to the packaging of cigarette boxes, and is particularly suitable for the packaging of special-shaped cigarette boxes.

[0074] Compared with the prior art, the present invention provides a high-precision laser minimally invasive functional film, comprising a film body; a gold pull wire is provided on the surface of the film body; the film body is provided with an indentation, the indentation is located on one side or both sides of the gold pull wire, and one end of the indentation extends to the gold pull wire.

[0075] While ensuring the sealing of the film packaging, the present invention uses a laser to create cuts on the surface of the film without cutting through it. Besides the cuts, the film does not suffer from other appearance defects caused by heat, such as whitening, yellowing, or curling. To address the terminal's on-machine application, the film is first coded (with positioning blocks sprayed online) and then laser cut (completed online). The cigarette film with positioning blocks and laser cut features is rolled into a roll, thereby solving the production efficiency problem of terminal applications. The present invention completely solves the problem of the film not easily falling off after the gold pull wire is torn off in tobacco special-shaped packaging. On the one hand, the cost increase is not large, while the original product design concept is maintained and there is no visual impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 A schematic structural diagram of the functional film (sheet film) provided by the present invention;

[0077] Figure 2 A schematic structural diagram of the functional film (rolled film) provided by the present invention;

[0078] Figure 3 Schematic diagram of the device provided by the present invention. DETAILED DESCRIPTION

[0079] In order to further illustrate the present invention, the high-precision laser minimally invasive functional film and the manufacturing method thereof provided by the present invention are described in detail below with reference to the embodiments.

[0080] Example 1

[0081] The high-precision laser minimally invasive functional film in this embodiment is made of BOPP, which is divided into a three-layer structure of upper, middle and lower layers. The total thickness is 18 μm, the laser frequency is set at 20%, the tangent depth is 8 μm, and the tangent length is 10 mm (10 mm on each side of the gold wire).

[0082] The manufacturing method of the above-mentioned high-precision laser minimally invasive BOPP cigarette film is as follows:

[0083] (1) Film roll unwinding

[0084] Place the BOPP cigarette film cut to the required width on the unwinding position of the equipment;

[0085] (2) Surface treatment

[0086] Perform corona treatment on the coding area of ​​the film. If the surface tension of the film itself is greater than 37 dynes and the adhesion to the ink is sufficient, you may consider not using corona treatment.

[0087] (3) Gold wire drawing

[0088] Press the gold wire at the designated position of the film. This step is better implemented on the customer's cigarette packaging machine;

[0089] (4) Online coding

[0090] During the unwinding process, the film is sprayed with a positioning code at the specified position in the required color, size, and spacing.

[0091] (5) Inkjet code recognition

[0092] The device recognizes the positioning code and feeds the signal back to the laser.

[0093] (6) Laser cutting

[0094] After receiving the feedback signal, the laser performs the tangent action at the specified position as required.

[0095] (7) Rolling

[0096] The processed film is flattened and then wound up by a winder.

[0097] Example 2

[0098] The high-precision laser minimally invasive functional film in this embodiment is made of BOPP, which is divided into a three-layer structure of upper, middle and lower layers. The total thickness is 22 μm, the laser frequency is set at 35%, the tangent depth is 12 μm, and the tangent length is 15 mm (15 mm on each side of the gold wire).

[0099] The manufacturing method of the above-mentioned high-precision laser minimally invasive BOPP cigarette film is as follows:

[0100] (1) Film roll unwinding

[0101] Place the BOPP cigarette film cut to the required width on the unwinding position of the equipment;

[0102] (2) Surface treatment

[0103] Perform corona treatment on the coding area of ​​the film. If the surface tension of the film itself is greater than 37 dynes and the adhesion to the ink is sufficient, you may consider not using corona treatment.

[0104] (3) Gold wire drawing

[0105] Press the gold wire at the designated position of the film. This step is better implemented on the customer's cigarette packaging machine;

[0106] (4) Online coding

[0107] During the unwinding process, the film is sprayed with a positioning code at the specified position in the required color, size, and spacing.

[0108] (5) Inkjet code recognition

[0109] The device recognizes the positioning code and feeds the signal back to the laser.

[0110] (6) Laser cutting

[0111] After receiving the feedback signal, the laser performs the tangent action at the specified position as required.

[0112] (7) Rolling

[0113] The processed film is flattened and then wound up by a winder.

[0114] The above embodiments are only intended to help understand the method and core concept of the present invention. It should be noted that, without departing from the principles of the present invention, a number of improvements and modifications may be made to the present invention by those skilled in the art, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A high-precision laser minimally invasive functional film, characterized in that: including a membrane body; A gold wire is provided on the surface of the membrane body; The membrane body is provided with an indentation, the indentation is located on one side or both sides of the gold pull wire, and one end of the indentation extends to the gold pull wire; The depth of the indentation is 30% to 80% of the thickness of the membrane body; The film body is a BOPP three-layer co-extruded polypropylene film, which is divided into three layers: upper layer, middle layer and lower layer; The upper layer is extruded by blending the following raw materials: ethylene-propylene-butadiene terpolymer or ethylene-propylene binary copolymer heat-sealing functional masterbatch, silicone polymer, and anti-blocking agent; The middle layer is extruded by blending the following raw materials: homopolymer polypropylene, petroleum resin, and antistatic agent; The lower layer is extruded by blending the following raw materials: ethylene-propylene-butadiene terpolymer or ethylene-propylene binary copolymer heat-sealing functional masterbatch and anti-blocking agent; The equipment for preparing the functional film includes: Unwinding device, inkjet printer, inkjet printer recognition device, laser; The bottom material of the laser cutout that contacts the film is a smooth white ceramic plate or a ceramic roller.

2. The high-precision laser minimally invasive functional film according to claim 1, characterized in that: The indentation is a straight line indentation.

3. The high-precision laser minimally invasive functional film according to claim 1, characterized in that: The indentation is arranged perpendicular to the gold wire.

4. The high-precision laser minimally invasive functional film according to claim 1, characterized in that: Two indentations are symmetrically arranged on both sides of the gold wire.

5. The high-precision laser minimally invasive functional film according to claim 1, characterized in that: The indentation is a laser cut indentation.

6. The high-precision laser minimally invasive functional film according to claim 1, characterized in that: The length of the indentation is 8 to 20 mm.

7. An apparatus for preparing the functional film according to any one of claims 1 to 6, comprising: Unwinding device, inkjet printer, inkjet printer recognition device, laser; The bottom material of the laser cutout that contacts the film is a smooth white ceramic plate or a ceramic roller.

8. The method for preparing the functional film according to any one of claims 1 to 6, comprising the following steps: A) Place the film body on the unwinding shaft; B) Spray the positioning code on the membrane body; C) Identify the positioning code and feed the signal back to the laser; D) Laser cutting.

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