A film winding body

Abstract

This invention provides a film winding body. The film winding body includes a paper core, adhesive tape disposed on the paper core, and a film wound around the paper core; the film is connected to the paper core by the adhesive tape, with one end of the film adhered to the tape forming an acute angle, and the area where the film and tape are adhered is triangular. The film winding body provided by this invention allows for easy separation of the film from the paper core by pulling, and the adhesive tape remains on the paper core, preventing paper scraps and adhesive tape from being introduced during automated packaging production.

Description

Technical Field

[0001] This utility model belongs to the field of thin film processing technology, and specifically relates to a thin film winding body. Background Technology

[0002] In the food industry, there is zero tolerance for the contamination of foreign matter during the production process. In traditional packaging plants, the bonding of film rolls, paper cores, and tape is usually achieved by directly pasting the neatly cut film with right-angled edges onto the paper core using tape. However, in automated packaging production, due to the high packaging speed, the film and paper core may separate under the pulling force of the automated packaging equipment when the film is almost finished. At this time, the tape is easily stuck to the film, thus bringing the tape and paper scraps attached to it into the automated packaging equipment, which can easily mix into the food and affect food safety. Traditional film rolls are no longer suitable for the requirements of automated packaging production.

[0003] Therefore, it is necessary to develop a film winding body to solve the problem that tape and paper scraps attached to the tape are easily brought into the automatic packaging equipment during automatic packaging production. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a film winding body that, by setting the end of the film and tape to be bonded at an acute angle, can both fix the film and easily separate the film from the paper core by pulling, leaving the tape on the paper core, thus avoiding the introduction of paper scraps and tape during automatic packaging production.

[0005] To achieve the objective of this utility model, the following technical solution is adopted:

[0006] In a first aspect, the present invention provides a film winding body, the film winding body comprising a paper core, an adhesive tape disposed on the paper core, and a film wound on the paper core; the film is connected to the paper core by the adhesive tape, the end of the film adhered to the adhesive tape is an acute angle, and the area of ​​the film adhered to the adhesive tape is triangular.

[0007] In this invention, by connecting the film to the paper core with tape, and setting the end of the film and tape to be pasted at an acute angle, the pasted position of the film, tape, and paper core of the film roll can be easily separated from the paper core by stretching. After separation, the tape can remain on the paper core instead of the film, thus avoiding the introduction of paper scraps and tape into the packaging process when some paper core and tape are taken away with the film during automatic packaging production.

[0008] Preferably, the acute angle is 45° to 60°, such as 47°, 49°, 51°, 53°, 55° or 57°, and more preferably 45°.

[0009] In this invention, the acute angle is preferably 45° to 60°. This ensures that the tape remains on the paper core when the film is separated from the paper core, without causing excessive film waste. If the acute angle is too small, it is difficult to manually cut a small angle with a knife in actual production, and it is also difficult to properly fix the end of the film to the paper core. Taking a film width of 100mm as an example, when the acute angle is 30°, the hypotenuse is twice the width of the film, that is, the length of the hypotenuse is 200mm. When the acute angle is 45°, the hypotenuse is 141.4mm of the width of the film. The hypotenuse with an angle of 45° is easier to curl onto the paper core during workshop operations and will not cause excessive film waste. Moreover, the angle of 45° is easier to obtain; a standard 45° angle can be obtained simply by folding the width of the film in the direction of its length. If the acute angle is too large, the pulling force required to separate the film from the paper core is large, making it difficult to separate the film from the paper core.

[0010] Preferably, the length of the area where the film and tape are adhered is less than the length of the tape parallel to the film's extension direction.

[0011] In this invention, the length of the area where the film and tape are bonded refers to the length of the area where the film and tape are bonded parallel to the direction of film extension, and the width of the area where the film and tape are bonded refers to the length of the area where the film and tape are bonded perpendicular to the direction of film extension.

[0012] Preferably, the ratio of the length of the area where the film and adhesive strip are bonded to the width of the film is (0.1 to 0.4):1, for example, 0.13:1, 0.16:1, 0.19:1, 0.22:1, 0.25:1, 0.28:1, 0.31:1, 0.34:1 or 0.37:1, etc.

[0013] In this invention, if the ratio of the length of the area where the film and adhesive strip are bonded to the width of the film is too small, it will be difficult to separate the film from the paper core when stretching. If the ratio of the length of the area where the film and adhesive strip are bonded to the width of the film is too large, the film will easily fall off when stretching. However, if the ratio of the length of the area where the film and adhesive strip are bonded to the width of the film is too small, it will be difficult to achieve a good fixing effect.

[0014] Preferably, the ratio of the length of the area where the film and adhesive strip are bonded to the thickness of the film is (400-1000):1, for example, 500:1, 600:1, 700:1, 800:1 or 900:1.

[0015] Preferably, the thickness of the film is 15 to 40 μm, such as 17 μm, 19 μm, 21 μm, 23 μm, 25 μm, 27 μm, 29 μm, 31 μm, 33 μm, 35 μm, 37 μm or 39 μm.

[0016] Preferably, the width of the film is 40 to 150 mm, such as 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm or 140 mm.

[0017] Preferably, the length of the tape parallel to the film extension direction is 45-55 mm, such as 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 51 mm, 52 mm, 53 mm or 54 mm.

[0018] Preferably, the length of the area where the film and tape are adhered is 10 to 30 mm, such as 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm or 14.5 mm, and more preferably 10 to 15 mm.

[0019] Preferably, the tape is a single-sided tape.

[0020] Preferably, the adhesive strength of the tape is 5.1 to 8.75 N / 25 mm, such as 5.5 N / 25 mm, 6 N / 25 mm, 6.5 N / 25 mm, 7 N / 25 mm, 7.5 N / 25 mm, 8 N / 25 mm, or 8.5 N / 25 mm.

[0021] In this invention, the adhesive strength of the tape is obtained by testing in accordance with GB / T 2792-2014.

[0022] Preferably, the film is a packaging film.

[0023] Preferably, the film is an aluminized polypropylene film.

[0024] Preferably, the outer diameter of the paper core is 94-96 mm, such as 94.2 mm, 94.4 mm, 94.6 mm, 94.8 mm, 95 mm, 95.2 mm, 95.4 mm, 95.6 mm or 95.8 mm.

[0025] Preferably, the inner diameter of the paper core is 74-76 mm, such as 74.2 mm, 74.4 mm, 74.6 mm, 74.8 mm, 75 mm, 75.2 mm, 75.4 mm, 75.6 mm or 75.8 mm.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] In this invention, the film in the film winding body is connected to the paper core via adhesive tape. The end where the film and tape are bonded is set at an acute angle, ensuring good fixation of the film at the bonding point of the film, tape, and paper core, while also allowing for easy separation of the film from the paper core by pulling. The tape remains on the paper core, preventing paper scraps and tape from being introduced during automated packaging production. The tensile strength at which the paper core and film of the film winding body separate is 15.01–25.85 N / mm. 2 The length change rate is 2.65% to 5.56%. Preferably, the tensile strength of the film winding after separating the paper core and the film is 16.84 to 23.25 N / mm. 2 . Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of the film roll provided in Example 1 when the film is unrolled;

[0029] Wherein, 1-paper core; 2-tape; 3-film; 4-the area where the film and tape are pasted, ∠α represents the acute angle at the end where the film and tape are pasted, 5-the length of the tape parallel to the film's extension direction, 6-the length of the area where the film and tape are pasted;

[0030] Figure 2 A schematic diagram of the structure of the thin film winding provided for Comparative Example 1 when the thin film is unwound;

[0031] Wherein, 1-paper core; 2-tape; 3-film; 4-the area where the film and tape are pasted. Detailed Implementation

[0032] The technical solution of this utility model will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0033] Example 1

[0034] This embodiment provides a thin film roll, and a schematic diagram of the structure of the thin film roll when the film is unrolled is shown below. Figure 1 As shown. The film winding body includes a paper core 1, adhesive tape 2 disposed on the paper core, and a film 3 wound around the paper core; the film is connected to the paper core by the adhesive tape, and the end of the film adhered to the adhesive tape is at an acute angle (…). Figure 1 In the middle (∠α), the acute angle is 45°, and the area 4 where the film and tape are pasted is triangular.

[0035] The aforementioned film is aluminized polypropylene film (VMOPP), manufactured by Tongda Packaging Materials Co., Ltd., with the grade SMT26N, a thickness of 26μm, and a width of 100mm. The non-aluminized side of the aluminized polypropylene film is adhered to the adhesive tape.

[0036] The inner diameter of the paper core is 75mm, the outer diameter is 95mm, and the length is 100mm.

[0037] The tape mentioned above is BOPP tape with a thickness of 45μm. It is manufactured by Jiangyin Huishun Packaging Materials Co., Ltd., and has a viscosity of 6.5N / 25mm.

[0038] The length of the tape parallel to the film extension direction is 48 mm, and the length perpendicular to the film extension direction is 100 mm.

[0039] The length of area 6 where the film and tape are adhered is 14.5 mm, and the area of ​​area 4 where the film and tape are adhered is 105.1 mm². 2 .

[0040] Example 2

[0041] This embodiment provides a film winding body, which includes a paper core, an adhesive tape disposed on the paper core, and a film wound on the paper core; the film is connected to the paper core by the adhesive tape, and the end of the film that is pasted with the adhesive tape is an acute angle with an angle of 50°, and the area where the film is pasted with the adhesive tape is triangular.

[0042] The aforementioned film is an aluminized polypropylene film manufactured by Tongda Packaging Materials Co., Ltd., with the grade SMT18N, a thickness of 18μm, and a width of 100mm. The non-aluminized side of the aluminized polypropylene film is adhered to the adhesive tape.

[0043] The inner diameter of the paper core is 75mm, the outer diameter is 95mm, and the length is 100mm.

[0044] The tape mentioned above is BOPP tape with a thickness of 45μm. It is manufactured by Jiangyin Huishun Packaging Materials Co., Ltd., and has a viscosity of 6.5N / 25mm.

[0045] The length of the tape parallel to the film extension direction is 48mm, and the length perpendicular to the film extension direction is 100mm.

[0046] The length of the area where the film and tape are adhered is 13.0 mm, and the area is 100.6 mm². 2 .

[0047] Example 3

[0048] This embodiment provides a film winding body, which includes a paper core, an adhesive tape disposed on the paper core, and a film wound on the paper core; the film is connected to the paper core by the adhesive tape, and the end of the film that is pasted with the adhesive tape is an acute angle with an angle of 60°, and the area where the film is pasted with the adhesive tape is triangular.

[0049] The aforementioned film is an aluminized polypropylene film manufactured by Tongda Packaging Materials Co., Ltd., with the grade SMT26N, a thickness of 26μm, and a width of 100mm. The non-aluminized side of the aluminized polypropylene film is adhered to the adhesive tape.

[0050] The inner diameter of the paper core is 75mm, the outer diameter is 95mm, and the length is 100mm.

[0051] The tape mentioned above is BOPP tape with a thickness of 45μm. It is manufactured by Jiangyin Huishun Packaging Materials Co., Ltd., and has a viscosity of 6.5N / 25mm.

[0052] The length of the tape parallel to the film extension direction is 48mm, and the length perpendicular to the film extension direction is 100mm.

[0053] The length of the area where the film and tape are adhered is 11.0 mm, and the area is 104.8 mm². 2 .

[0054] Example 4

[0055] This embodiment provides a film winding body, which differs from Embodiment 1 in that the acute angle is adjusted to 70°, the length of the area where the film and tape are adhered is adjusted to 8.748 mm, and the area of ​​the area where the film and tape are adhered is maintained at 105.1 mm². 2 constant.

[0056] Example 5

[0057] This embodiment provides a film winding body, which differs from Embodiment 1 in that the acute angle is adjusted to 30°, the length of the area where the film and tape are adhered is adjusted to 19.09 mm, and the area of ​​the area where the film and tape are adhered is maintained at 105.1 mm². 2 The conditions remain the same as in Example 1.

[0058] Example 6

[0059] This embodiment provides a film roll, which differs from Embodiment 1 in that the film is an aluminized polypropylene film manufactured by Tongda Packaging Materials Co., Ltd., with the grade SMT40N, a thickness of 40μm, and a width of 100mm. The non-aluminized side of the aluminized polypropylene film is adhered to the tape, and other conditions are the same as in Embodiment 1.

[0060] Example 7

[0061] This embodiment provides a film roll, which differs from Embodiment 1 in that the film is an aluminized polypropylene film manufactured by Tongda Packaging Materials Co., Ltd., with the grade SMT26N, a thickness of 26μm, and a width of 40mm. The non-aluminized side of the aluminized polypropylene film is adhered to the tape, and other conditions are the same as in Embodiment 1.

[0062] Example 8

[0063] This embodiment provides a film roll, which differs from Embodiment 1 in that the film is an aluminized polypropylene film manufactured by Tongda Packaging Materials Co., Ltd., with the grade SMT26N, a thickness of 26μm, and a width of 200mm. The non-aluminized side of the aluminized polypropylene film is adhered to the tape, and other conditions are the same as in Embodiment 1.

[0064] Comparative Example 1

[0065] This comparative example provides a thin film winding body, and a schematic diagram of the structure of the thin film winding body when the film is unwound is shown below. Figure 2 As shown, the film winding body includes a paper core 1, an adhesive tape 2 disposed on the paper core, and a film 3 wound on the paper core; the film is connected to the paper core by the adhesive tape, the edges of the film and the adhesive tape are at right angles, and the area where the film and the adhesive tape are attached is rectangular 4.

[0066] The aforementioned film is an aluminized polypropylene film manufactured by Tongda Packaging Materials Co., Ltd., with the grade SMT26N, a thickness of 26μm, and a width of 100mm. The non-aluminized side of the aluminized polypropylene film is adhered to the adhesive tape.

[0067] The inner diameter of the paper core is 75mm, the outer diameter is 95mm, and the length is 100mm.

[0068] The tape mentioned above is BOPP tape with a thickness of 45μm. It is manufactured by Jiangyin Huishun Packaging Materials Co., Ltd., and has a viscosity of 6.5N / 25mm.

[0069] The length of the tape parallel to the film extension direction is 48 mm, and the length perpendicular to the film extension direction is 7.2 mm.

[0070] The area where the film and tape are adhered is 14.5 mm long, 7.2 mm wide, and has an area of ​​105.1 mm². 2 .

[0071] The film windings provided in Examples 1-8 and Comparative Example 1 were tested as follows:

[0072] (1) Tensile strength when the paper core and film are separated: The film attached to the film winding body is stretched at a stretching rate of 300 mm / min. The tangent of the extended film is perpendicular to the diameter of the paper core. When the film is separated from the paper core, it is observed whether the tape is attached to the film. The tensile force when the film and tape are separated is recorded as F, and the area of ​​the area where the film and tape are attached is recorded as S. The tensile strength when the paper core and film are separated = F / S.

[0073] (2) Length change rate: Before stretching, a mark was made 30 mm from the acute angle vertex of the film. The film attached to the film winding was stretched at a stretching rate of 300 mm / min, and the length change rate of the film after separation from the paper core was tested. The test results are shown in Table 1 below:

[0074] Table 1

[0075]

[0076]

[0077] As shown in Table 1, when the film and paper core are separated in the film windings provided in Examples 1-8, the tape remains on the paper core, and the tensile strength at which the paper core and film are separated is 15.01-25.85 N / mm. 2 The length variation rate is 3.2% to 5.56%.

[0078] Compared to Example 1, if the acute angle at the end where the film is attached to the tape is larger (Example 4), the tensile strength required to separate the paper core and the film is greater, making separation difficult. Conversely, if the acute angle at the end where the film is attached to the tape is smaller (Example 5), the tensile strength is lower, making it difficult to securely fix the film to the paper core, and resulting in more wasted film. Therefore, controlling the acute angle within a specific range leads to a shorter preparation time for the film winding and better separation of the paper core and film.

[0079] Compared with Example 1, if the thickness of the film is too large (Example 6), the ratio of the length of the area where the film and the adhesive strip are bonded to the thickness of the film is too small, which requires a large pulling force and results in a poor separation effect between the film and the paper core.

[0080] Compared to Example 1, if the width of the film is smaller (Example 7), the ratio of the length of the area where the film and the adhesive strip are bonded to the width of the film is larger, and therefore a greater tensile force is required.

[0081] Compared with Example 1, if the width of the film is too large (Example 8), the ratio of the length of the area where the film and the adhesive strip are bonded to the width of the film is too small. This not only requires a large tensile force, but also results in a large tensile deformation rate of the film, leading to poor separation between the film and the paper core.

[0082] Compared to Example 1, if the film and the tape are at right angles, and the film with neatly cut ends and right angles is directly pasted onto the paper core using tape (Comparative Example 1), the tape will stick to the film when the film is separated, which can easily bring in paper scraps and tape during automatic packaging production.

[0083] The applicant declares that the present invention is illustrated through the above embodiments, but the present invention is not limited to the above process steps, that is, it does not mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials used, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of the present invention.

Claims

1. A thin film winding, characterized in that, The film winding body includes a paper core, adhesive tape disposed on the paper core, and a film wound on the paper core. The film is connected to the paper core by the adhesive tape, and the end of the film that is pasted with the adhesive tape is an acute angle. The area where the film is pasted with the adhesive tape is triangular.

2. The film winding according to claim 1, characterized in that, The acute angle is 45° to 60°.

3. The film winding according to claim 1, characterized in that, The length of the area where the film and tape are adhered is less than the length of the tape parallel to the film's extension direction.

4. The film winding according to claim 1, characterized in that, The ratio of the length of the area where the film and adhesive strip are bonded to the width of the film is (0.1~0.4):1; The ratio of the length of the area where the film and adhesive strip are bonded to the thickness of the film is (400~1000):

1.

5. The film winding according to claim 1, characterized in that, The thickness of the film is 15–40 μm; The width of the film is 40–150 mm; The length of the tape parallel to the film extension direction is 45-55 mm; The length of the area where the film and tape are adhered is 10-30 mm.

6. The film winding according to claim 1, characterized in that, The tape is a single-sided tape.

7. The film winding according to claim 1, characterized in that, The film is a packaging film.

8. The film winding according to claim 1, characterized in that, The film is an aluminized polypropylene film.

9. The film winding according to claim 1, characterized in that, The outer diameter of the paper core is 94–96 mm.

10. The film winding according to claim 1, characterized in that, The inner diameter of the paper core is 74–76 mm.

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