Embossed aluminum foil composite paper processing technology and embossed aluminum foil composite paper thereof

Abstract

The invention relates to the technical field of laminated product production methods, and particularly discloses a production process of aluminum foil composite paper with embossments and a product produced thereof.The production process comprises the steps of S1, unwinding, S2, gluing, S3, compounding, S4, drying, S5, embossing and S6, winding, the drying temperature is 90-100 DEG C, and the drying retention time of primary aluminum foil composite paper is 10-12 s; the embossing pressure is 0.4 to 0.5 MPa. Through selection of processing parameters such as proper composite adhesive parameters (including water content, components and the like), composite adhesive coating amount, drying processing parameters and embossing pressure parameters, the embossed aluminum foil composite paper which is deep in embossing depth and good in consistency can be obtained through processing at a high yield on the premise that the energy consumption of an overall processing production line is proper.

Description

Technical Field

[0001] The present invention relates to the technical field of laminated product production methods, and in particular to a production process of embossed aluminum foil composite paper and the product produced. Background Art

[0002] Aluminum foil composite paper is a material composed of aluminum foil and backing paper (or other substrates such as plastic film) bonded together with an adhesive. It combines the excellent properties of aluminum foil with the processing adaptability of paper. The aluminum foil layer on the composite paper has the function of blocking oxygen, water vapor, light, and odors, thereby extending the shelf life of the contents. The aluminum foil layer also has a metallic luster and high aesthetic value, making it widely used in food packaging, pharmaceutical packaging, and other fields.

[0003] With the widespread application of aluminum foil composite paper in various fields, some consumers have put forward customized requirements for aluminum foil composite paper, which usually involves embossing relevant brand patterns on the surface of the aluminum foil composite paper. For example, the patent application number 201710799277.9 discloses a composite embossed packaging aluminum foil and its process. In the process of this patent, the printed pattern of the aluminum foil includes embossing I (1), and embossing II (2) is printed in the remaining blank area; the embossing I (1) is a checkered pattern; the embossing II (2) is a trademark or logo. The process includes: S1 graphic design; S2 making an embossed steel roller; S3 adhesive lamination; S4 embossing: installing the embossing steel rod and the wool paper roller to the embossing machine, and sending the composite product of step S3 to the embossing machine for embossing; S5 peeling. This patent can realize the customized embossing requirements of aluminum foil composite paper and meet the relevant requirements of consumers.

[0004] However, as some consumers have further increased their requirements for pattern clarity, the aluminum foil composite paper obtained by the existing embossing process can no longer meet the relevant requirements. Therefore, there is an urgent need for an embossing process that can produce aluminum foil composite paper with clearer patterns. Summary of the Invention

[0005] The present invention provides a processing technology for embossed aluminum foil composite paper. By simultaneously improving the production process and embossing process of the aluminum foil composite paper, the pattern depth on the processed embossed aluminum foil composite paper is deeper, that is, the pattern clarity is better in appearance while ensuring a high yield.

[0006] The present invention is achieved through the following technical solutions: A processing technology for embossed aluminum foil composite paper comprises: S1. unwinding, wherein an aluminum foil backing paper and an aluminum foil are unwound and transported separately by an unwinding device; S2. gluing, wherein a composite glue is applied to the aluminum foil backing paper by a coating device; S3. compounding, wherein the aluminum foil backing paper and the aluminum foil are tightly bonded by extruding a composite component to obtain a primary aluminum foil composite paper; S4. drying, wherein the primary aluminum foil composite paper is dried by a drying device to obtain a finished aluminum foil composite paper, wherein the drying temperature is 90-100°C, and the residence time of the primary aluminum foil composite paper in the drying device is 10-12 seconds; S5. embossing, wherein the finished aluminum foil composite paper is conveyed to an embossing machine for embossing, wherein the embossing pressure is 0.4-0.5 MPa; and S6. winding, wherein the embossed aluminum foil composite paper obtained by the processing is received by a winding device.

[0007] As a further improvement of the present invention, between S1 and S2, an aluminum foil lining paper cleaning process is also included, and a cleaning device is used to clean the surface of the aluminum foil lining paper.

[0008] As a further improvement of the present invention, the cleaning device comprises at least two groups of brush rollers for brushing and cleaning the laminating surface and the bottom surface of the aluminum foil liner respectively.

[0009] As a further improvement of the present invention, the water content of the composite glue used in S2 is 50-70%.

[0010] As a further improvement of the present invention, in S2, the coating amount of the composite adhesive is 1.2~2.5 g / m 2 .

[0011] As a further improvement of the present invention, the composite adhesive at least contains polyvinyl acetate emulsion, polyvinyl alcohol protective colloid, urea, polydimethylsiloxane and water.

[0012] As a further improvement of the present invention, a tensioning step is further included between S3 and S4, in which the primary aluminum foil composite paper being transmitted is tensioned and stretched by a tensioning roller.

[0013] As a further improvement of the present invention, a primary winding step and a rewinding step are sequentially included between S4 and S5, wherein in the primary winding step, the dried aluminum foil composite paper product is wound up by a winding device; and in the rewinding step, the aluminum foil composite paper product is discharged by an unwinding device.

[0014] As a further improvement of the present invention, in S5, the embossing machine includes a supporting roller and an embossing roller, wherein hydraulic drive devices are provided on both sides of the embossing roller to drive the embossing roller close to the supporting roller, thereby providing the embossing pressure for the aluminum foil composite paper product transmitted between the two.

[0015] In a second aspect, the present invention provides an embossed aluminum foil composite paper, which is produced by any of the above-mentioned embossed aluminum foil composite paper processing processes, and the embossing depth thereon is 30-50 μm.

[0016] In order to make the pattern on the embossed aluminum foil composite paper clearer, it is necessary to deepen the embossing depth on the embossed aluminum foil composite paper. If only the embossing pressure is increased during the embossing work, although the embossed pattern can be deepened, it is also easy to cause larger wrinkles on the aluminum foil composite paper, which in turn easily causes damage to the embossed aluminum foil composite paper, resulting in a decrease in the yield rate.

[0017] In the present invention, the inventors discovered through experiments that when the moisture content in the embossed aluminum foil composite paper is controlled between 4% and 5%, the embossed aluminum foil composite paper produced can withstand greater embossing pressure to present a clearer embossed pattern, and is not prone to large wrinkles and damage. Furthermore, under the process of the present invention, the inventors can ensure that the moisture content of the aluminum foil composite paper produced is strictly controlled before entering the embossing process by adjusting processing parameters such as the drying temperature and the residence time of the primary aluminum foil composite paper in the drying step, so as to meet more stringent embossing requirements.

[0018] At the same time, since the main water-containing raw material in the aluminum foil composite paper is the composite glue, the moisture content, coating amount and composition of the composite glue are also controlled under the preferred process to ensure that the composite glue has good bonding properties while reducing the impact of the water contained therein on the processed aluminum foil composite paper, thereby reducing its impact on the clarity of the subsequent embossed pattern. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are provided for use in conjunction with preferred embodiments of the present invention to help understand the objects and advantages of the present invention, wherein: Figure 1 This is the processing flow chart of embossed aluminum foil composite paper; Figure 2 This is a picture of the finished product of the embossed aluminum foil composite paper in Example 1; Figure 3 This is a picture of the finished product of the embossed aluminum foil composite paper in Example 2; Figure 4 This is a picture of the finished product of the embossed aluminum foil composite paper in Comparative Example 1; Figure 5 This is the finished product of the embossed aluminum foil composite paper in Comparative Example 2. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and implementation examples.

[0021] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0022] The processing devices used in this embodiment include an unwinding device, a coating device, etc., which are all common commercially available devices. Any aluminum foil composite paper processing equipment that can realize functions such as unwinding and composite glue coating is applicable. Example

[0023] This embodiment provides an embossed aluminum foil composite paper having an embossing depth of 45 μm. The embossed aluminum foil composite paper is obtained by the following steps: S1. Unwinding, unwinding and transmitting the aluminum foil liner and the aluminum foil respectively through the unwinding device 1, for example, Figure 1 As shown, the unwinding device 1 includes a feed roller, and the aluminum foil liner and the aluminum foil are fed out on their respective feed rollers; S2. Gluing, as shown Figure 1 As shown, the composite glue is applied to the aluminum foil backing paper by the coating device 2; S3. Composite, the aluminum foil backing paper and the aluminum foil are tightly bonded by extruding the composite component 3 to obtain the primary aluminum foil composite paper, for example, Figure 1 As shown, in this embodiment, the pressurized composite device includes several groups of squeezing rollers. The aluminum foil liner paper and the aluminum foil are transmitted between the adjacent squeezing rollers. During the squeezing rollers, the squeezing rollers can force the two to be in close contact to complete the composite; S4. Drying, the primary aluminum foil composite paper is dried by the drying device 4 to obtain the finished aluminum foil composite paper. In this embodiment, the drying temperature is 95 ° C. At the same time, since the primary aluminum foil composite paper is continuously transmitted during the processing, in this embodiment, the transmission speed of the primary aluminum foil composite paper in the drying device 4 is 125 m / min, so that the residence time of each portion of the primary aluminum foil composite paper in the drying device 4 is 10 s. For example, as Figure 1 As shown, in this embodiment, the drying device 4 includes several groups of heating rollers. The primary aluminum foil composite paper is transmitted between the adjacent heating rollers, during which the heating rollers can achieve a drying effect on the primary aluminum foil composite paper; S5. Embossing, the finished aluminum foil composite paper is conveyed to the embossing machine 6 for embossing. In this embodiment, the embossing pressure is 0.4 MPa; S6. Rewinding, the embossed aluminum foil composite paper obtained by processing is received by the rewinding device 5.

[0024] Preferably, if Figure 1As shown, between S1 and S2, an aluminum foil backing paper cleaning process is also included, in which the surface of the aluminum foil backing paper is cleaned using a cleaning device 7. This step is used to remove residual particles on the aluminum foil backing paper, thereby reducing the probability of residual particles in the processed aluminum foil composite paper. This makes the surface of the processed aluminum foil composite paper smoother, and reduces the probability of pattern imprinting errors and aluminum foil composite paper damage during embossing during subsequent embossing.

[0025] Preferably, in this embodiment, the cleaning device 7 includes two sets of brush rollers, with a working channel formed between the two sets of brush rollers to allow the aluminum foil backing paper to pass through. As the aluminum foil backing paper passes through, the two sets of brush rollers can brush both sides of the foil to remove particles and the like thereon. One of the two sides is the contact surface for contacting the aluminum foil, and the other is the bottom surface.

[0026] Preferably, the composite adhesive used in S2 is a water-based adhesive, comprising polyvinyl acetate emulsion, polyvinyl alcohol protective colloid, urea, polydimethylsiloxane, and water. The polyvinyl acetate emulsion is the primary component of the composite adhesive, providing bonding properties. This material has strong adhesion to porous materials (such as wood and paper), making it suitable for bonding the aluminum foil backing paper to the aluminum foil in this embodiment. The polyvinyl alcohol protective colloid is used to enhance the stability of the polyvinyl acetate emulsion and improve the leveling properties of the composite adhesive. Urea is used to reduce the brittleness of the adhesive film formed by the polyvinyl acetate emulsion and enhance its flexibility. In this embodiment, this ensures that the resulting embossed aluminum foil composite paper has good flexibility and is less susceptible to breakage during embossing. Polydimethylsiloxane suppresses the generation of bubbles in the adhesive during stirring or coating, thereby improving the yield rate of the coating process. Water serves as a dispersion medium, regulating the viscosity and solids content of the adhesive, ensuring that the composite adhesive possesses good coating performance. In this embodiment, the water content is 60%, and the coating amount on the aluminum foil backing paper is 1.3 g / m 2 .

[0027] Preferably, if Figure 1 As shown, a tensioning step is included between S3 and S4, in which the primary aluminum foil composite paper is stretched and tightened during transport by tensioning roller 8. This structure ensures that the primary aluminum foil composite paper is relatively flat and stretched before entering the drying step, thereby achieving a uniform drying effect throughout the primary aluminum foil composite paper during drying. The finished aluminum foil composite paper also remains flat and free of major wrinkles after drying. This prevents excessive moisture content or wrinkles in certain areas of the finished aluminum foil composite paper during subsequent embossing, which could result in poor pattern clarity or even damage during embossing.

[0028] Preferably, in S5, the embossing machine 6 includes a support roller 601 and an embossing roller 602, wherein hydraulic drive devices are provided on both sides of the embossing roller 602 to drive the embossing roller 602 closer to the support roller 601, thereby providing the embossing pressure to the finished aluminum foil composite paper product passing between the support roller 601 and the support roller 601. In this configuration, the primary driving force of the embossing roller 602 is provided on both sides of the embossing roller 602, enabling the embossing roller 602 as a whole to provide stable and uniform embossing pressure to the finished aluminum foil composite paper product passing therethrough, thereby ensuring a high degree of consistency in the depth and clarity of the pattern on the processed embossed aluminum foil composite paper. Example

[0029] This embodiment provides an embossed aluminum foil composite paper having an embossing depth of 30 μm. The processing technology of the embossed aluminum foil composite paper is different from that of Example 1 in the following aspects: First, in this embodiment, in the drying step, the drying temperature is 100°C, the transmission speed of the primary aluminum foil composite paper in the drying device 4 is 110 m / min, and the residence time of each portion of the primary aluminum foil composite paper in the drying device 4 is 11 s; in the embossing step, the embossing pressure is 0.5 MPa; the water content of the composite glue used in this embodiment is 70%, and the coating amount during use is 1.2 g / m 2 .

[0030] Secondly, in this embodiment, a primary winding step and a rewinding step are provided between the drying step and the embossing step. Specifically, Figure 1 As shown, in the primary winding step, the dried aluminum foil composite paper product is stored by the winding device 5; and in the rewinding step, the aluminum foil composite paper product is unwound by the unwinding device 1.

[0031] The inventors discovered through actual production that, on the one hand, the processing line, which includes unwinding, gluing, laminating, and drying, is already quite long. If the embossing and winding processes are directly connected after the drying process, the processing line will be further lengthened. This requires more complex global coordination when adjusting process parameters, and prolongs production changeover time (such as when changing the glue type), which in turn reduces the overall production efficiency of the embossed aluminum foil composite paper. At the same time, in terms of subsequent repair and maintenance, a failure of a certain equipment section may cause the entire line to shut down, resulting in serious production capacity losses. On the other hand, it is difficult to balance the processing efficiency of the finished aluminum foil composite paper product and the processing efficiency of the embossing process. In particular, when embossing a deeper pattern, the processing efficiency of the embossing process may be lower than that of the finished aluminum foil composite paper product. Therefore, considering the above, the inventors chose to first wind up and store the finished aluminum foil composite paper product after processing, and then release the material through the unwinding device 1 during the embossing process, so as to achieve coordination between the different processing steps on the processing line and improve processing efficiency.

[0032] Comparative Example 1: This comparative example provides an embossed aluminum foil composite paper having a target embossing depth of 35 μm. The processing technology of the embossed aluminum foil composite paper has the following differences compared to Example 1: In this comparative example, in the drying step, the drying temperature is 85°C, the transmission speed of the primary aluminum foil composite paper in the drying device 4 is 150 m / min, and the residence time of each portion of the primary aluminum foil composite paper in the drying device 4 is 8 s; in the embossing step, the embossing pressure is 0.6 MPa; the water content of the composite glue used in this embodiment is 70%, and the coating amount when used is 1.2 g / m 2 .

[0033] Comparative Example 2: This comparative example provides an embossed aluminum foil composite paper having a target embossing depth of 35 μm. The processing technology of the embossed aluminum foil composite paper has the following differences compared to Example 1: In this comparative example, in the drying step, the drying temperature is 110°C, the transmission speed of the primary aluminum foil composite paper in the drying device 4 is 80 m / min, and the residence time of each portion of the primary aluminum foil composite paper in the drying device 4 is 15 s; in the embossing step, the embossing pressure is 0.3 MPa; the water content of the composite glue used in this embodiment is 80%, and the coating amount during use is 2.8 g / m 2 .

[0034] Embossed clarity analysis: like Figures 2 and 3 As shown, the embossed aluminum foil composite paper obtained in Examples 1 and 2 has a high overall clarity of the embossed pattern, and the clarity of the embossed pattern at each location is highly consistent.

[0035] And as Figures 4 and 5 As shown, the overall clarity of the embossed patterns on the embossed aluminum foil composite papers in Comparative Examples 1 and 2 was significantly reduced. During the processing of Comparative Example 1, the drying step failed to meet the relevant requirements. Tests by the inventors revealed that the moisture content of the resulting aluminum foil composite paper reached 7%. Even when the embossing pressure was increased during subsequent processing, the clarity of the pattern on the resulting embossed aluminum foil composite paper remained poor. During the processing of Comparative Example 2, the inventors tested that, despite producing a finished aluminum foil composite paper with a moisture content of 5%, the high moisture content of the glue used and the excessive coating amount required for drying significantly increased the temperature required, significantly increasing production energy consumption. Furthermore, insufficient embossing pressure during subsequent processing also reduced the clarity of the pattern on the embossed aluminum foil composite paper, making it difficult to meet higher usage requirements.

[0036] In summary, the present invention has formulated appropriate composite glue parameters (including water content, composition, etc.), composite glue coating amount, drying processing parameters and embossing pressure parameters, etc., which can, under the premise of appropriate energy consumption of the overall processing production line, obtain embossed aluminum foil composite paper with a deeper embossing depth and better consistency at a higher yield rate. In terms of appearance, it has a clearer embossed pattern, can be accepted by the majority of consumers, and is conducive to the promotion and use of related products.

[0037] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A process for processing embossed aluminum foil composite paper, characterized in that: Includes: S1. Unwinding, unwinding and transmitting the aluminum foil liner and the aluminum foil respectively through the unwinding device (1); S2. Gluing, applying composite glue to the aluminum foil backing paper through the coating device (2); S3. Compounding, by extruding the composite component (3) to achieve close bonding between the aluminum foil backing paper and the aluminum foil to obtain a primary aluminum foil composite paper; S4. Drying, drying the primary aluminum foil composite paper by a drying device (4) to obtain a finished aluminum foil composite paper, wherein the drying temperature is 90-100° C., and the residence time of the primary aluminum foil composite paper in the drying device (4) is 10-12 s; S5. Embossing, conveying the finished aluminum foil composite paper to an embossing machine (6) to produce embossing, wherein the embossing pressure is 0.4-0.5 MPa; S6. Rewinding: The embossed aluminum foil composite paper obtained by the processing is received by the rewinding device (5).

2. The process for processing embossed aluminum foil composite paper according to claim 1, characterized in that: Between S1 and S2, an aluminum foil backing paper cleaning process is also included, and a cleaning device (7) is used to clean the surface of the aluminum foil backing paper.

3. The process for processing embossed aluminum foil composite paper according to claim 2, characterized in that: The cleaning device (7) comprises at least two groups of brush rollers for brushing and cleaning the laminating surface and the bottom surface of the aluminum foil liner respectively.

4. The process for processing embossed aluminum foil composite paper according to claim 1, characterized in that: The water content of the composite glue used in S2 is 50~70%.

5. The process for processing embossed aluminum foil composite paper according to claim 4, characterized in that: In S2, the coating amount of the composite adhesive is 1.2~2.5 g / m 2 .

6. The process for processing embossed aluminum foil composite paper according to claim 4, characterized in that: The composite adhesive at least contains polyvinyl acetate emulsion, polyvinyl alcohol protective colloid, urea, polydimethylsiloxane and water.

7. The process for processing embossed aluminum foil composite paper according to claim 1, characterized in that: A tensioning step is also included between S3 and S4, in which the primary aluminum foil composite paper being transmitted is tensioned and stretched by a tensioning roller (8).

8. The process for processing embossed aluminum foil composite paper according to claim 1, characterized in that: Between S4 and S5, a primary winding step and a rewinding step are sequentially included, wherein in the primary winding step, the aluminum foil composite paper product obtained by drying is wound up by the winding device (5); and in the rewinding step, the aluminum foil composite paper product is unwound by the unwinding device (1).

9. The process for processing embossed aluminum foil composite paper according to claim 1, characterized in that: In S5, the embossing machine (6) includes a supporting roller (601) and an embossing roller (602), wherein hydraulic drive devices are provided on both sides of the embossing roller (602) to drive the embossing roller (602) close to the supporting roller (601), thereby providing the embossing pressure for the finished aluminum foil composite paper product transmitted between the two rollers.

10. An embossed aluminum foil composite paper, characterized in that: The embossed aluminum foil composite paper is produced by the processing technology of any one of claims 1 to 9, and the embossing depth is 30 to 50 μm.

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