Beer bottle label with waterproof and crease-resistant functions and preparation method thereof

Abstract

The invention discloses a beer bottle label with waterproof and crease-resistant functions. The label is sequentially provided with a base material, a bottom coating, an aluminum layer, a waterproof and crease-resistant surface layer and an identification layer from top to bottom. The bottom coating is prepared from the following components in percentage by weight: 65 to 80 parts of styrene-acrylic emulsion, 10 to 25 parts of nano calcium carbonate, 0.2 to 1.5 parts of wetting penetrant, 0.1 to 0.8 part of flatting agent, 0.1 to 0.8 part of defoaming agent and the balance of deionized water; the waterproof and crease-resistant surface layer is prepared from the following components in percentage by weight: 40 to 60 parts of acrylic acid modified polycarbonate type waterborne polyurethane emulsion, 5 to 15 parts of nano silicon dioxide, 3 to 8 parts of hydrophobic modifier, 2 to 5 parts of cross-linking agent, 0.5 to 2 parts of flatting agent and defoaming agent and the balance of water; the identification layer is a printing ink layer. According to the label, a triple protection system is formed by the wet-strength base paper base material, the closed priming coat and the waterproof and crease-resistant surface layer, the aluminum layer and the ink layer do not fall off after the label is soaked in water for 48 hours, the label can still keep flat, free of wrinkles, clear in line, free of bulging and excellent in size stability, and the glossiness of the label is greatly improved compared with that of the label in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of labels, in particular to a beer bottle label with waterproof and wrinkle-resistant functions and a preparation method thereof. BACKGROUND

[0002] Beer labels are an important part of beer packaging, and have the functions of product information display and brand image promotion. However, traditional beer labels (especially paper labels) face two main problems during use: 1. "Poor water resistance": During the cold storage, transportation and consumption of beer, condensation water is easily generated on the surface of the bottle due to temperature difference, or the bottle is directly in contact with ice and water. Traditional paper labels are prone to deformation, wrinkling, and falling off after being exposed to water, and even the printed images are blurred and damaged, which seriously affects the appearance of the product and the brand image.

[0003] 2. "Labeling prone to wrinkling": During the conveying, gluing and labeling process on the high-speed labeling production line, the label is easily wrinkled due to mechanical stress. After labeling, if the tensile strength of the label material itself is insufficient, it is also prone to permanent wrinkles due to small deformation of the bottle or external pressure, affecting the appearance.

[0004] At present, although some paper-plastic labels have certain waterproofness, they often have problems such as poor weather resistance, poor printing adaptability, environmental protection is questionable, high cost, or unsatisfactory wrinkle resistance.

[0005] For example, a kind of loose aluminized label paper and its preparation method with publication number CN117306316A, which comprises a base paper layer, an ion coating layer, an inner coating layer, an aluminized film layer and an outer coating layer arranged from bottom to top. The ion coating layer contains modified acrylic polyurethane resin and layered double hydroxide compound. The inner coating layer and the outer coating layer are both anionic water-based acrylic emulsion coating and dried. The ion coating layer can block the transmission of water absorbed by the base paper to the inner coating layer, and also can avoid the phenomenon of bubbling, wrinkling and edge lifting of the loose aluminized label paper during use. However, the manufacturing cost of this technical solution is high, and there is still a lot of room for improvement in gloss, wrinkle resistance, water immersion durability and dimensional stability.

[0006] Therefore, it is urgent to develop a beer bottle label with excellent comprehensive performance, excellent water immersion durability, wrinkle resistance, gloss, printing adaptability and dimensional stability. SUMMARY

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a beer bottle label with waterproof and wrinkle-resistant functions, and a beer label with excellent water immersion durability, wrinkle resistance, gloss, printing adaptability and dimensional stability.

[0008] To solve the above problems, the technical scheme adopted by the present application is as follows: A beer bottle label with waterproof and wrinkle-resistant functions, characterized in that a substrate, a primer layer, an aluminum layer, a waterproof and wrinkle-resistant surface layer, and a marking layer are sequentially arranged from top to bottom. The primer layer comprises, in terms of weight percentage, 65-80 parts of a solid content of 25-35% of a styrene-acrylic emulsion, 10-25 parts of nano calcium carbonate, 0.2-1.5 parts of a wetting penetrant, 0.1-0.8 parts of a leveling agent, 0.1-0.8 parts of a defoaming agent, and the balance of deionized water. The waterproof and wrinkle-resistant surface layer comprises, in terms of weight percentage, 40-60 parts of a solid content of 18-25% of a polycarbonate type waterborne polyurethane emulsion, 5-15 parts of nano silicon dioxide, 3-8 parts of a hydrophobic modifier, 2-5 parts of a crosslinking agent, 0.5-2 parts of a leveling agent and a defoaming agent, and the balance of water. The marking layer is a printing ink layer.

[0009] Preferably, the hydrophobic modifier is a fluorocarbon compound.

[0010] Preferably, the crosslinking agent is a carbodiimide.

[0011] Preferably, the marking layer is covered with a varnish layer.

[0012] Preferably, the substrate is a wet-strength base paper.

[0013] Preferably, the aluminum layer is a vacuum evaporated aluminum layer.

[0014] Preferably, the thickness of the substrate is 50-80 g / m2, and the thickness of the aluminum layer is 200±40 angstroms.

[0015] Preferably, the wetting penetrant is JFC wetting penetrant.

[0016] Preferably, the polycarbonate type waterborne polyurethane emulsion is an acrylic modified polycarbonate type waterborne polyurethane emulsion.

[0017] The preparation method of the label comprises the following steps: S1: substrate pretreatment: corona treatment is performed on the substrate to improve the surface tension and enhance the bonding force with the primer layer and the aluminum layer.

[0018] S2: coating the primer layer: the prepared primer coating is coated on the substrate by a doctor blade or an anilox roll, and then dried and cured.

[0019] S3: vacuum aluminum plating: the substrate treated in S2 is placed in a vacuum aluminum plating machine, and under high temperature and high vacuum conditions, the aluminum wire is evaporated and uniformly deposited on the surface of the base paper to form an aluminum layer.

[0020] S4: Coating waterproof and wrinkle-resistant surface layer: the prepared waterproof and wrinkle-resistant surface layer coating is uniformly coated on the aluminum layer by a precision coating machine (such as a screen roller coating head), and then dried and cured.

[0021] S5: Printing identification layer: using ink to perform intaglio or flexographic printing on the waterproof and wrinkle-resistant surface layer of the product prepared in S4, to obtain an identification layer.

[0022] S6: Glazing: coating a protective varnish layer on the identification layer.

[0023] S7: Punching: punching according to the size to form the label of the present application.

[0024] Compared with the prior art, the present application has the following beneficial effects: 1. Strong adhesion and anti-aluminum peeling: the unique primer layer technology ensures the adhesion of the aluminum layer to the base paper substrate, and the adhesion reaches level 0 by the grid method test, which fundamentally avoids the peeling of the aluminum layer.

[0025] 2. Excellent waterproof and wrinkle resistance: the wet-strength base paper substrate, the closed primer layer and the waterproof and wrinkle-resistant surface layer form a triple protection system. After the label is pasted on the bottle and immersed in water for 48 hours, the aluminum layer and the ink layer do not fall off, and still maintain flatness, no wrinkles, clear lines, no bulging, and excellent dimensional stability.

[0026] 3. High gloss and printing adaptability: through the excellent adhesion, flatness and transparency of the substrate and the primer layer, the aluminum plating gloss of the label is ≥20, which is greatly improved compared with the prior art, and combined with the characteristics of the waterproof and wrinkle-resistant surface layer, it provides excellent printing adaptability for the label, and makes the pattern color of the label more bright and full.

[0027] 4. Excellent mechanical properties: the overall folding resistance and surface wear resistance of the label are significantly improved, and the wear resistance is ≥200 times, which can meet the requirements of high-speed labeling machine ≥40000 bottles / hour and harsh transportation environment.

[0028] 5. Environmentally friendly and recyclable: using wet-strength base paper as the substrate, and using environmentally friendly water-based resin for the coating material, which meets the green packaging trend. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the label structure; Figure 2 is a physical photo of the waterproof test; Figure 3 is a physical photo of the gloss test; Figure 4 is a physical photo of the abrasion resistance test; Figure 5 is a physical photo of the dimensional stability test; Figure 6The photos of the labeling process parameters.

[0030] Wherein: substrate 1, primer layer 2, aluminum layer 3, waterproof wrinkle-resistant surface layer 4, identification layer 5, varnish layer 6. DETAILED DESCRIPTION

[0031] The present application can be realized in many different forms and is not limited to the embodiments described herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or", includes any and all combinations of one or more of the associated listed items.

[0033] The application is further described below in the detailed description: A beer bottle label with waterproof wrinkle-resistant function, which is sequentially provided from top to bottom with substrate 1, primer layer 2, aluminum layer 3, waterproof wrinkle-resistant surface layer 4 and identification layer 5, The primer layer 2 is composed of 65-80 parts of phenylpropylene emulsion with solid content of 25-35%, 10-25 parts of nano calcium carbonate, 0.2-1.5 parts of wetting penetrant, 0.1-0.8 parts of leveling agent, 0.1-0.8 parts of defoaming agent, and the rest of deionized water.

[0034] The primer layer 2 uses phenylpropylene emulsion as the film-forming matrix to provide excellent adhesion, flexibility and transparency; nano calcium carbonate enhances the adhesion of the aluminum layer and improves the strength of the coating; wetting penetrant promotes penetration and strengthens sealing; leveling agent provides excellent leveling to ensure the flatness of the film layer; and defoaming agent eliminates foam during production and use. The wetting penetrant used in this embodiment is JFC wetting penetrant, which is a non-ionic wetting penetrant mainly composed of fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether.

[0035] The waterproof wrinkle-resistant surface layer 4 is composed of 40-60 parts of acrylic modified polycarbonate type waterborne polyurethane emulsion with solid content of 18-25%, 5-15 parts of nano silicon dioxide, 3-8 parts of hydrophobic modifier, 2-5 parts of crosslinking agent, 0.5-2 parts of leveling agent and defoaming agent, and the rest of water. The polycarbonate type water-based polyurethane takes polycarbonate diol as one of the main raw materials, and has better water resistance, adhesion and friction resistance after modification by acrylic acid compared with polyether type polyurethane and polyester type polyurethane, and meanwhile has the characteristics of high gloss, so that the color of the label pattern is more full and bright; and the polycarbonate type water-based polyurethane after modification has good toughness and surface hardness after film formation, so that the anti-wrinkle ability of the label can be improved.

[0036] The nano-silicon dioxide is uniformly dispersed in the resin, which significantly improves the surface hardness, wear resistance and scratch resistance of the coating, prevents the label from wrinkling and scratching in friction. The hydrophobic modifier (such as fluorocarbon compound) gives the coating super strong hydrophobic property; the crosslinking agent is used to promote the crosslinking of the resin to form a dense three-dimensional network structure, further enhancing the water resistance and mechanical strength of the coating; the leveling agent and defoaming agent ensure that the coating is uniform, flat and defect-free.

[0037] The identification layer 5 is a printed ink layer.

[0038] The identification layer 5 is printed with environmentally friendly ink with good adhesion to form the required patterns and text. The coating benefits from a smooth base to achieve bright colors and high-definition printing effects.

[0039] Further, the hydrophobic modifier is a fluorocarbon compound.

[0040] Through the hydrophobic modification of the fluorocarbon compound, the coating is given super strong hydrophobic property, so that the water droplet contact angle is greater than 110°, forming a "lotus effect", so that condensed water is difficult to infiltrate the surface of the label.

[0041] Further, the crosslinking agent is a carbodiimide.

[0042] Further, the identification layer 5 is covered with a varnish layer 6.

[0043] The varnish layer 6 is a transparent protective layer covering the identification layer 5, further strengthening the waterproof, anti-friction and ultraviolet resistance of the label, and protecting the printed pattern from fading.

[0044] Further, the substrate 1 is a wet-strength base paper.

[0045] The wet-strength base paper is treated with a wet-strength agent (such as melamine-formaldehyde resin or polyamide epoxy chloropropane resin) during production, so that it can still retain more than 15% of its dry strength after complete wetting, effectively resisting erosion of condensed water and preventing softening and damage.

[0046] Further, the aluminum layer 3 is a vacuum evaporated aluminum layer.

[0047] The aluminum layer 3 is formed on the surface of the primer layer 2 by vacuum evaporation, and is a dense and uniform metal aluminum layer, which not only provides a beautiful metallic luster and barrier property, but also serves as an additional waterproof barrier and has good anti-wrinkle effect.

[0048] The key point of the present application is the synergistic effect of the primer layer 2 and the waterproof and anti-wrinkle surface layer 4: the primer layer 2 solves the "internal problems", which strengthens the base material 1, closes the water diffusion channel, and firmly locks the aluminum layer, preventing delamination and wrinkling from the inside; the waterproof and anti-wrinkle surface layer 4 solves the "external problems", which directly resists the external condensate water generated by the beer bottle in the refrigeration, and protects the stability of the aluminum layer and the identification layer 5. Through the combination of the two, the internal and external problems are solved, and the structural integrity and aesthetics of the label are ensured throughout the life cycle.

[0049] Further, the thickness of the base material 1 is 50-80 g / m2, and the thickness of the aluminum layer 3 is 200±40 angstroms.

[0050] Further, the wetting penetrant is JFC wetting penetrant.

[0051] The preparation method of the label of the present application comprises the following steps: S1: base material pretreatment: the base material 1 is subjected to corona treatment to improve the surface tension, so as to enhance the bonding force with the primer layer 2 and the aluminum layer 3.

[0052] S2: coating the primer layer 2: the prepared primer layer 2 coating is coated on the base material 1 by a doctor blade or an anilox roll, with a coating dry amount of 2~4 g / m2, and then dried and cured (drying temperature 100-120℃).

[0053] Note: the coating dry amount refers to the amount of coating per unit area under the specified dry film thickness of the coating.

[0054] S3: vacuum aluminum plating: the base material 1 treated in S2 is placed in a vacuum aluminum plating machine, and under high temperature and high vacuum conditions, the aluminum wire is evaporated and uniformly deposited on the surface of the base paper to form the aluminum layer 3.

[0055] S4: coating the waterproof and anti-wrinkle surface layer 4: the prepared waterproof and anti-wrinkle surface layer 4 coating is uniformly coated (coating dry amount 1~3 g / m2) on the aluminum layer 3 by a precision coater (such as an anilox roll coating head), and then cured by passing through a drying channel (drying temperature 80-100℃).

[0056] S5: printing the identification layer 5: the waterproof and anti-wrinkle surface layer 4 of the S5 finished product is printed by intaglio or flexographic printing using ink to obtain the identification layer 5.

[0057] S6: glazing: a protective glazing layer 6 is coated on the identification layer 5.

[0058] S7: cutting and punching: cutting and punching according to size, to obtain the label of the present application.

[0059] The main performance test results of the label of the embodiment of the present application are as follows:

[0060] The label of the present application ensures the firmness of the aluminum layer and the base paper substrate through a unique primer technology, and the adhesion force reaches 0 level through the grid method test, fundamentally avoiding the aluminum layer from falling off.

[0061] Through the wet-strength base paper substrate, the closed primer and the waterproof and wrinkle-resistant surface layer, a triple protection system is formed, and after the label is pasted on the bottle, the aluminum layer and the ink layer do not fall off after being immersed in water for 48 hours, and still can maintain flatness, no wrinkles, clear lines, no drumming, and excellent dimensional stability.

[0062] The smooth base surface provided by the primer makes the aluminum plating gloss of the label greater than 20, which is greatly improved compared with the gloss (5-6) of the publication No. CN117306316A, so that the printed pattern of the label is more colorful and full.

[0063] Moreover, the overall folding resistance and surface wear resistance of the label are significantly improved, the wear resistance is greater than or equal to 200 times, which can meet the requirements of high-speed labeling machine greater than or equal to 40000 bottles / hour and harsh transportation environment.

[0064] In the production of sedrin 460ml glass bottled beer, the actual stable labeling speed of the present application reaches 53500 bottles / hour.

[0065] For those skilled in the art, other various corresponding changes and transformations can be made according to the above described technical solutions and concepts, and all of these changes and transformations should belong to the protection scope of the patent claims of the present application.

Claims

1. A beer bottle label with waterproof and wrinkle-resistant properties, characterized in that: From top to bottom, the substrate (1), base coating (2), aluminum layer (3), waterproof and wrinkle-resistant surface layer (4) and labeling layer (5) are arranged sequentially. The base coating (2) comprises, by weight percentage: 65-80 parts of styrene-acrylic emulsion with a solid content of 25-35%, 10-25 parts of nano-calcium carbonate, 0.2-1.5 parts of wetting and penetrating agent, 0.1-0.8 parts of leveling agent, 0.1-0.8 parts of defoamer, and the balance being deionized water; The waterproof and wrinkle-resistant surface layer (4) comprises, by weight percentage: 40-60 parts of polycarbonate-type waterborne polyurethane emulsion with a solid content of 18-25%, 5-15 parts of nano silica, 3-8 parts of hydrophobic modifier, 2-5 parts of crosslinking agent, 0.5-2 parts of leveling agent and defoamer, with the remainder being water. The marking layer (5) is a printing ink layer.

2. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The hydrophobic modifier is a fluorocarbon compound.

3. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The crosslinking agent is carbodiimide.

4. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The label layer (5) is covered with a varnish layer (6).

5. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The substrate (1) is wet-strength base paper.

6. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The aluminum layer (3) is a vacuum-deposited aluminum layer.

7. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The thickness of the substrate (1) is 50-80 g / m², and the thickness of the aluminum layer (3) is 200 ± 40 angstroms.

8. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The wetting and penetrating agent is JFC wetting and penetrating agent.

9. The beer bottle label with waterproof and wrinkle-resistant function as described in claim 1, characterized in that: The polycarbonate-type waterborne polyurethane emulsion is an acrylic-modified polycarbonate-type waterborne polyurethane emulsion.

10. A label preparation method for preparing a beer bottle label with waterproof and wrinkle-resistant function as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: Substrate pretreatment: The substrate (1) is subjected to corona treatment to increase its surface tension, thereby enhancing its adhesion to the base coating (2) and aluminum layer (3); S2: Applying the primer coating (2): Apply the prepared primer coating (2) onto the substrate (1) using a scraper or an anilox roller, and then dry and cure it; S3: Vacuum aluminum plating: The substrate (1) after S2 treatment is placed in a vacuum aluminum plating machine. Under high temperature and high vacuum conditions, the aluminum wire evaporates and is uniformly deposited on the surface of the original paper to form an aluminum layer (3). S4: Apply waterproof and wrinkle-resistant surface layer (4): Apply the prepared waterproof and wrinkle-resistant surface layer (4) coating evenly to the aluminum layer (3) using a precision coating machine (such as an anilox roller coating head), and then dry and cure it. S5: Printed Marking Layer (5): The marking layer (5) is obtained by using ink on the waterproof and wrinkle-resistant surface layer (4) of the finished product in S4 for gravure, flexographic or offset printing. S6: Varnishing: Apply a protective varnish layer (6) to the marking layer (5); S7: Cutting and punching: Cutting and punching to the required dimensions to obtain the label of this invention.

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