Positioning shrinkage composite iron film and preparation method thereof

Abstract

The invention provides a positioning shrinkage composite iron film. The positioning shrinkage composite iron film comprises a shrinkage film, the positioning information layer is provided with a positioning cursor, and the positioning information layer is arranged on one side of the shrink film; and the optical reflecting layer is a light-proof layer, and the optical reflecting layer is arranged on one surface, opposite to the shrink film, of the positioning information layer or is arranged on one surface, opposite to the shrink film, of the positioning information layer. The method has the beneficial effects that the nickel plate with positioning information is directly embossed on the shrink film in the laminating process so as to reduce the process steps, so that the yield can be improved; and a positioning cursor is provided to ensure that the pattern is still exquisite after being shrunk.

Description

Technical Field

[0001] The invention relates to the technical field of packaging iron-clad films, in particular to a positioning shrinkage iron-clad film and a preparation method thereof. Background Art

[0002] In the prior art, most iron-clad films can only produce general optical effect patterns, and it is difficult to achieve some exquisite optical patterns with anti-counterfeiting effects. Chinese Patent 202022984570.2 adopts UV molding technology to first chemically treat the PET film on both sides, and then integrate the visual anti-counterfeiting information with printing ink on a piece of iron-clad film by molding. The iron-clad film is then composited with the metal plate to produce metal plate products with anti-counterfeiting and packaging functions. However, since the above-mentioned iron-clad film production uses UV molding technology, the PET film needs to be chemically treated first, which increases the process steps, the production cost is high, and the environmental pollution increases. In addition, for cans with threaded shapes (such as milk powder cans, tea cans, etc.), the shrinkage performance of the iron-clad film is still unknown and it cannot ensure the degree of change and aesthetics of the positioning information pattern on the surface of the film with the thread. Summary of the invention

[0003] The purpose of the present invention is to produce an optical pattern that is exquisite and has an anti-counterfeiting effect. Specifically, the existing production model has many process steps and high production costs, so the output is low. The present invention realizes the lamination process by directly stamping a nickel plate with positioning information onto a shrink film to reduce the process steps, thereby increasing the output; another purpose of the present invention is to produce an accurate shrinkage pattern. Specifically, the existing production model has unknown shrinkage performance for a can body with a thread, and the pattern on the surface of the film cannot ensure its degree of change with the thread and its aesthetics. Therefore, the pattern is easily distorted when it shrinks to the can body. The positioning cursor provided by the present invention can ensure that the pattern remains exquisite after shrinking.

[0004] To achieve the above-mentioned purpose, the present invention provides a positioning shrinkable iron film, which includes: a shrink film; a positioning information layer, which is provided with a positioning cursor, and the positioning information layer is arranged on one side of the shrink film; and an optical reflective layer, which is an opaque layer, and the optical reflective layer is arranged on one side of the positioning information layer relative to the shrink film, or on one side of the positioning information layer opposite to the shrink film.

[0005] Preferably, the material of the shrink film includes PET, PVC, PP, PE, POF or OPS.

[0006] Preferably, the positioning cursor includes a positioning shrinkage cursor or a positioning printing cursor.

[0007] Preferably, the positioning cursor further comprises a micro-optical pattern.

[0008] Preferably, the optical reflective layer comprises a light-impermeable metal layer.

[0009] Preferably, the composite iron film further includes a printing layer, which is arranged on one side of the positioning information layer opposite to the shrink film or on one side of the positioning information layer opposite to the shrink film, wherein when the printing layer is arranged on one side of the positioning information layer opposite to the shrink film, a connecting layer is further arranged between the printing layer and the positioning information.

[0010] Preferably, the iron-clad film further comprises an iron-clad adhesive layer, which is disposed on a surface of the iron-clad film opposite to the printing layer.

[0011] The present invention provides a method for preparing a positioning shrinkage composite iron film, comprising the following steps: S1: preparing shrink film by laminating process; and S2: During the lamination process, the positioning information layer is printed onto the shrink film obtained in S1.

[0012] Preferably, the method further comprises the steps of: S31: coating an optical reflective layer on a surface of the positioning information layer away from the shrink film; or S32: coating an optical reflective layer on a surface of the shrink film away from the positioning information layer.

[0013] Preferably, the method further comprises the steps of:

[0014] S41: using a flexographic printing machine to print a printing layer on a side of the shrink film away from the positioning information layer; or S42: coating a connecting layer on a side of the positioning information layer away from the shrink film, A printing layer is printed on a side of the connection layer away from the positioning information layer using a flexographic printing machine.

[0015] Preferably, the method further comprises the steps of: S5: coating a composite glue on a surface of the composite iron film obtained in S41 or S42 opposite to the printing layer.

[0016] The beneficial effect of the present invention is that the nickel plate with positioning information is directly pressed onto the shrink film during the laminating process to reduce the process steps, thereby improving the output; and providing a positioning cursor can ensure that the pattern remains exquisite after shrinking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram illustrating an implementation of the present invention.

[0018] Figure 2 A flow chart is provided to illustrate the method of using the present invention.

[0019] Figure 3 It is a schematic diagram illustrating the top view of the positioning information layer of the present invention. Detailed Implementation Modes

[0020] To make the above and / or other objects, functions, and features of the present invention more obvious and understandable, the following provides preferred implementation modes for detailed description:

[0021] Please refer to Figure 1 , the present invention provides a positioning shrinkage composite iron film 1, which includes: a shrinkage film 11; a positioning information layer 12 provided with a positioning cursor 2, and the positioning information layer 12 is disposed on one side of the shrinkage film 11; and an optical reflection layer 13, which is an opaque layer, and the optical reflection layer 13 is disposed on the side of the positioning information layer 12 opposite to the shrinkage film 11, or on the side of the positioning information layer 12 opposite to the shrinkage film 11. The optical reflection layer 13 is disposed on the side of the positioning information layer 12 relative to the shrinkage film 11, or on the side of the shrinkage film 11 relative to the positioning information layer 12. Wherein, the thickness of the shrinkage film 11 is 12μm to 50μm; the thickness of the positioning information layer 12 is 2μm to 5μm; the thickness of the optical reflection layer 13 is 0.03μm to 0.07μm.

[0022] In some embodiments, the optical reflection layer 13 is disposed on the side of the positioning information layer 12 relative to the shrinkage film 11, or on the side of the shrinkage film 11 relative to the positioning information layer 12.

[0023] In some embodiments, the material of the shrinkage film 11 includes PET, PVC, PP, PE, POF or OPS; the positioning cursor 2 includes a positioning shrinkage cursor 22 or a positioning printing cursor 21; the positioning cursor 2 further includes a micro-optical pattern 23. Among them, the positioning shrinkage cursor 22 further uses " 卐", "卍", or "田" shape to check the shrinkage rate, but not limited to this. Specifically, this positioning shrinkage cursor 22 takes the intersection point as the center, and uses a magnifying glass to detect the distance between the horizontal or vertical lines above and below and left and right respectively to determine whether the shrinkage degree meets the requirements. The shrinkage degree of the composite iron film 1 of the present invention is less than 1.6%, preferably 0.1 to 1%; the pattern of the positioning printing cursor 21 is not limited to any pattern, such as triangles, quadrilaterals, crosses, circles, or combinations of multiple shapes, etc. It should be particularly noted that the positioning printing cursor 21 can also be replaced by the positioning shrinkage cursor 22, that is, only using the positioning shrinkage cursor 22 can meet the requirements of the present invention, but in specific implementation, the positioning shrinkage cursor 22 and the positioning printing cursor 21 can be calibrated and used during shrinkage and printing respectively.

[0024] Please refer to Figure 1 , the optical reflection layer 13 includes an opaque metal coating, wherein, The non-light-transmissive metal coating layer includes aluminum, zinc sulfide, or titanium dioxide, preferably aluminum. In addition, the optical reflective layer 13 can enhance the brightness of the positioning information layer 12 and the positioning cursor 2, which is beneficial to the positioning of the positioning cursor 2.

[0025] In other words, the positioning cursor 2 may be one or more cursors, including a positioning shrinking cursor 22 for locating the position of the micro-optical pattern 23 after shrinkage to confirm that the micro-optical pattern 23 will not be distorted and remains exquisite after shrinkage; a positioning printing cursor 21 for calibrating the position of the printing layer 14 during printing to avoid pattern displacement; or other cursors may be included to locate other additional layers, but are not limited thereto.

[0026] See also Figure 1 The iron-clad film 1 further includes a printing layer 14, which is disposed on one side of the shrink film 11 opposite to the positioning information layer 12 (left figure: reverse embossing) or disposed on one side of the positioning information layer 12 opposite to the shrink film 11 (right figure: forward embossing), wherein, When the printing layer 14 is disposed on a side of the positioning information layer 12 opposite to the shrink film 11 , a connecting layer 16 is further disposed between the printing layer 14 and the positioning information layer 12 , wherein: The printing layer 14 includes water-based gravure ink, and the connecting layer 16 includes water-based polyurethane. The positioning information layer 12 has a thickness of 2 μm to 5 μm.

[0027] See also Figure 1 The composite iron film 1 further includes a composite iron glue layer 15, which is arranged on a side of the composite iron film 1 opposite to the printing layer 14. The composite iron glue layer 15 is used to bond the composite iron film 1 to the metal plate to obtain a composite iron film with positioning shrinkage and optical anti-counterfeiting effects.

[0028] In other words, the present invention provides a positioning shrinkable composite iron film 1, which uses a laminating process to emboss the shrink film 11 and the positioning information at one time, which can reduce the work process; the optical reflective layer 13 is plated to make the shrink film 11 present an optical anti-counterfeiting effect; the positioning cursor 2 set on the positioning information layer 12 can assist the printing layer 14 to print at the correct position and confirm the shrink position, and the composite glue can bond the composite iron film 1 to the metal plate. In addition, the shrinkage degree of the positioning shrinkage cursor 22 can be calculated according to the shrinkage range of the metal plate to be bonded.

[0029] See also Figure 2 The present invention provides a method for preparing a positioning shrinkable composite iron film 1, which is characterized in that it includes the following steps: S1: preparing a shrink film 11 by a laminating process; and S2: imprinting a positioning information layer 12 onto the shrink film 11 obtained in S1 during the laminating process.

[0030] See also Figure 2In some embodiments, the method further includes the following steps: S31: coating an optical reflective layer 13 on a surface of the positioning information layer 12 away from the shrink film 11 ; or S32: coating an optical reflective layer 13 on a surface of the shrink film 11 away from the positioning information layer 12 .

[0031] See also Figure 2 In some embodiments, the method further includes the following steps: S41: using a flexographic printing machine to print the printing layer 14 on one side of the shrink film 11 away from the positioning information layer 12; or S42: after applying the connecting layer 16 on one side of the positioning information layer 12 away from the shrink film 11, using a flexographic printing machine to print the printing layer 14 on one side of the connecting layer 16 away from the positioning information layer 12.

[0032] See also Figure 2 In some embodiments, the method further comprises the step: S5: coating a metal material-specific composite glue on one side of the composite iron film 1 obtained in S41 or S42 opposite to the printed layer 14 .

[0033] Specific working principle:

[0034] See also Figure 3 , Figure 3 In order to locate the top view of the information layer 12, the positioning cursor 2 is used to locate the pattern position and the position after shrinkage of the printing layer 14. The positioning shrinkage cursor 22 is a cursor for checking the position after shrinkage, and the positioning printing cursor 21 is a cursor for checking the pattern position of the printing layer 14. In addition, the positioning cursor 2 is usually set at the corner or around the micro-optical pattern 23, such as Figure 3 As shown, the positioning cursor 2 is set at the four corners of the quadrilateral. In some embodiments, the composite iron film 1 is a pentagon, and the positioning cursor 2 is set at the five corners of the pentagon, and the same can be implemented on any polygon; when the composite iron film is a circle, the positioning cursor 2 is set at a position that can evenly divide the central angle of the circle, and at least 3 positioning cursors 2 can be set, preferably 3, 4, 5 or 6 positioning cursors 2 are set.

[0035] On the other hand, the composite iron film 1 of the present invention can be used for metal objects with threads. Such as milk powder cans or tea cans, etc., and can also be used for other metal objects with patterns, because the positioning cursor 2 can maintain the exquisite pattern after shrinking.

[0036] Monitor the shrinkage of the composite iron film before and after shrinkage by calculation or actual shrinkage

[0037] Example 1

[0038] A PP film with a thickness of 20-50 μm was prepared as a shrink film by a laminating process. During the laminating process, the positioning information layer was printed on the shrink film, and the process temperature was maintained at 90-120°C. The shrinkage degree of the iron-clad film was monitored before and after shrinkage, either by calculation or after actual shrinkage. The results are shown in Table 1 below.

[0039] Example 2

[0040] A PP film with a thickness of 20-50 μm was prepared as a shrink film by a laminating process. During the laminating process, the positioning information layer was printed on the shrink film, and the process temperature was maintained at 90-120°C. The shrinkage degree of the iron-clad film was monitored before and after shrinkage, either by calculation or after actual shrinkage. The results are shown in Table 1 below.

[0041] Example 3

[0042] A PP film with a thickness of 20-50 μm was prepared as a shrink film by a laminating process. During the laminating process, the positioning information layer was printed on the shrink film, and the process temperature was maintained at 90-120°C. The shrinkage degree of the iron-clad film was monitored before and after shrinkage, either by calculation or after actual shrinkage. The results are shown in Table 1 below.

[0043] Example 4

[0044] A PP film with a thickness of 20-50 μm was prepared as a shrink film by a laminating process. During the laminating process, the positioning information layer was printed on the shrink film, and the process temperature was maintained at 90-120°C. The shrinkage degree of the iron-clad film was monitored before and after shrinkage, either by calculation or after actual shrinkage. The results are shown in Table 1 below.

[0045] Comparative Example 1

[0046] The PP film with a thickness of 20-50 μm was coated on both sides, and the process temperature was maintained at 120-150°C. The first treatment layer and the second treatment layer were obtained on both sides of the PP film. Positioning information was embossed on the second treatment layer to monitor the shrinkage degree of the composite iron film before and after shrinkage, either calculated or after actual shrinkage. The results are shown in Table 1 below.

[0047] Table 1

[0048] It can be seen from Table 1 that the error between the calculated and actual measured shrinkage degree is only 0.01-0.09%. The difference is not noticeable to the naked eye, ensuring that the micro-optical pattern remains beautiful even after shrinking.

[0049] Test the degree of reflection when using forward or reverse stamping, and whether there is an error when the printed layer corresponds to the cursor. Among them, the stamping thickness reflects the clarity of the positioning information on the film surface, that is, the stamping thickness is proportional to the pressure and inversely proportional to the clarity. It should be noted that the film is in a plastic state during stamping, and the pressure generated will cause the film to deform, resulting in subsequent errors. As shown in Table 2 below.

[0050] Table 2

[0051] It should be noted that the best situation is when the error between the printed layer and the cursor is ≤±0.5mm; When the reflectivity is greater than 95%, the micro-optical pattern can be better displayed. As shown in Table 2, whether it is reverse embossing or forward embossing, when the thickness of the positioning information layer is 2-5 μm, the reflectivity is 95-99%, and the error value is only 0-1.1 mm.

[0052] Reverse embossing

[0053] Example 5

[0054] A PP film with an embossed thickness of 3 μm was prepared as a shrink film by a laminating process. During the laminating process, the positioning information layer was embossed onto the shrink film, and the process temperature was maintained at 90-120°C. An optical reflective layer was plated on one side of the positioning information layer away from the shrink film. A flexographic printing machine was used to print a printing layer on one side of the shrink film away from the positioning information layer. The clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, as well as the error value, were monitored. The monitoring results are shown in Table 3 below.

[0055] Example 6

[0056] A PP film with an embossed thickness of 5 μm was prepared as a shrink film by a laminating process. During the laminating process, the positioning information layer was embossed onto the shrink film, and the process temperature was maintained at 90-120°C. An optical reflective layer was plated on one side of the positioning information layer away from the shrink film. A flexographic printing machine was used to print a printing layer on one side of the shrink film away from the positioning information layer. The clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, as well as the error value, were monitored. The monitoring results are shown in Table 3 below.

[0057] Comparative Example 2

[0058] A PP film with an embossed thickness of 1 μm was prepared as a shrink film by a laminating process; during the laminating process, the positioning information layer was embossed onto the shrink film, and the process temperature was maintained at 90-120°C, an optical reflective layer was plated on one side of the positioning information layer away from the shrink film, a flexographic printing machine was used to print a printing layer on one side of the shrink film away from the positioning information layer, and the clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, as well as the error value, were monitored. The monitoring results are shown in Table 3 below.

[0059] Comparative Example 3

[0060] A PP film with an embossed thickness of 7 μm was prepared as a shrink film by a laminating process. During the laminating process, the positioning information layer was embossed onto the shrink film, and the process temperature was maintained at 90-120°C. An optical reflective layer was plated on one side of the positioning information layer away from the shrink film. A flexographic printing machine was used to print a printing layer on one side of the shrink film away from the positioning information layer. The clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, as well as the error value, were monitored. The monitoring results are shown in Table 3 below.

[0061] Comparative Example 4

[0062] The coating treatment was performed on both sides of the PP film with an embossing thickness of 3 μm, and the process temperature was maintained at 120-150°C, and the first processing layer and the second processing layer were obtained on both sides of the PP film. Positioning information was embossed on the second processing layer, and an optical reflective layer was plated on one side of the positioning information away from the PP film. A flexographic printing machine was used to print a printing layer on one side of the first processing layer away from the positioning information. The clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, and the error value were monitored. The monitoring results are shown in Table 3 below.

[0063] Table 3

[0064] As can be seen from Table 3, when the thickness is less than 2, the clarity of the positioning information will be relatively poor. Because the film is in a plastic state during embossing, the pressure generated will cause the film to deform. Therefore, a thickness that is too small will affect the clarity of the positioning information. Conversely, when the thickness is greater than 5, the positioning information is clearer, but the positioning information is distorted due to the excessive thickness. Therefore, a thickness of 2-5μm is preferred.

[0065] Positive embossing

[0066] Example 7

[0067] A PP film with an embossed thickness of 3 μm was prepared as a shrink film by a laminating process; during the laminating process, the positioning information layer was embossed onto the aforementioned shrink film, and the process temperature was maintained at 90-120°C, an optical reflective layer was plated on one side of the shrink film away from the positioning information layer, a connecting layer was coated on one side of the positioning information layer away from the shrink film, and a flexographic printing machine was used to print a printing layer on one side of the connecting layer away from the positioning information layer, and the clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, and the error value were monitored. The monitoring results are shown in Table 3 below.

[0068] Example 8

[0069] A PP film with an embossed thickness of 5 μm was prepared as a shrink film by a laminating process; during the laminating process, the positioning information layer was embossed onto the aforementioned shrink film, and the process temperature was maintained at 90-120°C, an optical reflective layer was plated on one side of the shrink film away from the positioning information layer, a connecting layer was coated on one side of the positioning information layer away from the shrink film, and a flexographic printing machine was used to print a printing layer on one side of the connecting layer away from the positioning information layer, and the clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, and the error value were monitored. The monitoring results are shown in Table 3 below.

[0070] Comparative Example 5

[0071] A PP film with an embossed thickness of 1 μm was prepared as a shrink film by a laminating process; during the laminating process, the positioning information layer was embossed onto the aforementioned shrink film, and the process temperature was maintained at 90-120°C, an optical reflective layer was plated on one side of the shrink film away from the positioning information layer, a connecting layer was coated on one side of the positioning information layer away from the shrink film, and a flexographic printing machine was used to print a printing layer on one side of the connecting layer away from the positioning information layer, and the clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, and the error value were monitored. The monitoring results are shown in Table 3 below.

[0072] Comparative Example 6

[0073] A PP film with an embossed thickness of 7 μm was prepared as a shrink film by adopting a laminating process; during the laminating process, the positioning information layer was embossed onto the aforementioned shrink film, and the process temperature was maintained at 90-120°C, an optical reflective layer was plated on one side of the shrink film away from the positioning information layer, a connecting layer was coated on one side of the positioning information layer away from the shrink film, and a flexographic printing machine was used to print a printing layer on one side of the connecting layer away from the positioning information layer, and the clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, and the error value were monitored. The monitoring results are shown in Table 3 below.

[0074] Comparative Example 7

[0075] The coating treatment was performed on both sides of the PP film with an embossing thickness of 3 μm, and the process temperature was maintained at 120-150°C, and the first processing layer and the second processing layer were obtained on both sides of the PP film. Positioning information was embossed on the second processing layer, and an optical reflective layer was plated on one side of the positioning information away from the PP film. A flexographic printing machine was used to print a printing layer on one side of the first processing layer away from the positioning information. The clarity of the positioning information, whether the positioning information was distorted, and whether there was an error when the printing layer corresponded to the cursor, and the error value were monitored. The monitoring results are shown in Table 3 below.

[0076] Table 4

[0077] As can be seen from Table 4, when the thickness is less than 2, the clarity of the positioning information will be relatively poor. Because the film is in a plastic state during embossing, the pressure generated will cause the film to deform. Therefore, a thickness that is too small will affect the clarity of the positioning information. Conversely, when the thickness is greater than 5, the positioning information is clearer, but the positioning information error is larger due to the excessive thickness. Therefore, a thickness of 2-5μm is better.

[0078] However, what is described above is only a preferred embodiment of the present invention, but it cannot be used to limit the patent protection scope of the present invention; therefore, all simple equivalent changes and modifications made according to the patent protection scope of the present invention and the contents of the specification still fall within the patent protection scope of the present invention.

Claims

1. A positioning shrinkage composite iron film, comprising: Shrink film; A positioning information layer is provided with a positioning cursor, and the positioning information layer is provided on one side of the shrink film; and The optical reflective layer is a light-impermeable layer, and the optical reflective layer is disposed on a surface of the positioning information layer opposite to the shrink film, or on a surface of the positioning information layer opposite to the shrink film.

2. The iron-clad film according to claim 1, characterized in that: The material of the shrink film includes PET, PVC, PP, PE, POF or OPS.

3. The iron-clad film according to claim 1, characterized in that: The positioning cursor includes a positioning shrinkage cursor or a positioning printing cursor.

4. The iron-clad film according to claim 3, characterized in that: The positioning cursor further includes a micro-optical pattern.

5. The iron-clad film according to claim 1, characterized in that: The optical reflective layer includes a light-impermeable metal layer.

6. The iron-clad film according to claim 1, characterized in that: The composite iron film further includes a printing layer, which is arranged on one side of the positioning information layer opposite to the shrink film or on one side of the positioning information layer opposite to the shrink film, wherein when the printing layer is arranged on one side of the positioning information layer opposite to the shrink film, a connecting layer is further arranged between the printing layer and the positioning information layer.

7. The iron-clad film according to claim 6, characterized in that: The iron-clad film further includes an iron-clad adhesive layer disposed on a surface of the iron-clad film opposite to the printing layer.

8. A method for preparing a positioning shrinkage composite iron film, characterized in that: The following steps are involved: S1: preparing shrink film by laminating process; and S2: During the lamination process, the positioning information layer is printed onto the shrink film obtained in S1.

9. The preparation method according to claim 8, characterized in that: It also includes the steps of: S31: coating an optical reflective layer on a surface of the positioning information layer away from the shrink film; or S32: coating an optical reflective layer on a surface of the shrink film away from the positioning information layer.

10. The preparation method according to claim 9, characterized in that: It also includes the steps of: S41: Printing a printing layer on a side of the shrink film away from the positioning information layer using a flexographic printing machine; or S42: After coating the connecting layer on the side of the positioning information layer away from the shrink film, a printing layer is printed on the side of the connecting layer away from the positioning information layer using a flexographic printing machine.

11. The preparation method according to claim 10, characterized in that: It also includes the steps of: S5: coating a composite glue on a surface of the composite iron film obtained in S41 or S42 opposite to the printing layer.

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