A bag with laser effect and high temperature resistance

Abstract

The application discloses a high-temperature-resistant and high-pressure-resistant bag with a laser effect, which comprises, from outside to inside, a printing layer, a substrate layer, a laser layer and a sealing layer; the sealing layer is a three-layer composite diaphragm, the outer layer of which is an encapsulation layer composed of 96.2 wt% polypropylene and 3.8 wt% stabilizer, the middle layer of which is a permeation layer composed of 96.2 wt% polystyrene and 3.8 wt% stabilizer, and the inner layer of which is a sticky layer composed of 61.8 wt% nitrile rubber, 36.3 wt% polyimide resin and 1.9 wt% stabilizer. The high-temperature-resistant and high-pressure-resistant characteristic of the bag can guarantee that the bag does not deform and break during the heating process of food, and ensure the safety and quality of the food. The design of the three-layer composite diaphragm can effectively isolate oxygen, moisture and odors from the outside, prolong the preservation period of the food, and the production method is simple and convenient, and can be mass-produced. The good corrosion resistance and durability can effectively delay the aging speed of the bag, and improve the stability and service life of the product.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, and more specifically to a bag with a laser effect that is resistant to high-temperature retort. Background Technology

[0002] In modern food processing and cooking, bags are widely used for packaging, storage, and cooking. However, traditional bags often cannot meet the requirements of high-temperature cooking, easily breaking or releasing harmful substances. As a sub-sector of the packaging industry, laser packaging has developed rapidly in recent years. Unlike other product packaging, it not only boasts a novel and attractive appearance but also anti-counterfeiting features. Laser anti-counterfeiting printed packaging products can be identified without additional equipment, increasing anti-counterfeiting strength and security. It represents the most cutting-edge technology in the global packaging and printing industry and is widely used in food, pharmaceuticals, daily chemical products, tobacco and alcohol, clothing, gift packaging, and decorative materials industries.

[0003] As people's living standards continue to improve, their requirements for packaging are also becoming increasingly stringent. People need packaging that offers excellent visual appeal and is resistant to counterfeiting. Anti-counterfeiting packaging requires high security and reliability, as well as ease of identification. Currently, most laser packaging is used on paper, and achieving this on composite films for flexible plastic packaging is quite challenging.

[0004] Therefore, how to provide a bag with a laser effect and resistance to high-temperature cooking is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a bag with laser-effect and high-temperature retort resistance.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-temperature retortible bag with a laser effect comprises, from the outside in, a printing layer, a substrate layer, a laser layer, and a sealing layer; the sealing layer is a three-layer composite membrane, with the outer layer being an encapsulation layer composed of 96.2 wt% polypropylene and 3.8 wt% stabilizer, the middle layer being a permeation layer composed of 96.2 wt% polystyrene and 3.8 wt% stabilizer, and the inner layer being an adhesive layer composed of 61.8 wt% nitrile rubber, 36.3 wt% polyimide resin, and 1.9 wt% stabilizer.

[0008] Preferably, in the above-mentioned laser-effect, high-temperature retort-resistant bag, the stabilizer is specifically BHT antioxidant.

[0009] Preferably, in the above-mentioned laser-effect high-temperature retortible bag, the thickness of the sealing layer in the sealing layer is 5-6 μm, the thickness of the permeable layer is 9-11 μm, and the thickness of the adhesive layer is 2-5 μm.

[0010] Preferably, in the above-mentioned laser-effect heat-resistant and retortable bag, the laser layer material is zinc.

[0011] Preferably, in the above-mentioned laser-effect, high-temperature retortible bag, the printed layer and the substrate layer are laminated using a polyurethane adhesive in a solvent-free manner.

[0012] Preferably, in the above-mentioned laser-effect high-temperature retortible bag, the viscosity of the polyurethane adhesive is 8500-11500 mPa·s.

[0013] Preferably, the production method of the above-mentioned laser-effect heat-resistant retort bag includes the following steps:

[0014] a. Apply polyurethane adhesive to the areas of the substrate layer where a laser effect is desired;

[0015] b. Transfer the laser layer on the laser transfer film with the laser layer to the polyurethane adhesive position on the substrate layer and dry it. Then use a slitting machine to peel off the laser transfer film.

[0016] c. Solvent-free lamination of the sealing layer and the laser layer yields the final bag with laser effect and high-temperature retort resistance.

[0017] Preferably, in the production steps of the above-mentioned laser-effect high-temperature retort bag, the laser transfer film is a 10μm thick laser film.

[0018] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Bags with laser effects can increase the attractiveness and aesthetics of products, thereby enhancing their market competitiveness.

[0020] 2. The high-temperature resistance to cooking ensures that the bag will not deform or break during food heating, thus ensuring the safety and quality of the food.

[0021] 3. The three-layer composite membrane design can effectively isolate external oxygen, moisture and odors, extending the shelf life of food.

[0022] 4. Solvent-free lamination using polyurethane adhesives avoids solvent residue issues and improves product safety.

[0023] 5. The production method is simple and easy to operate, enabling large-scale production, improving production efficiency and reducing costs.

[0024] 6. The use of a zinc-based laser layer provides excellent corrosion resistance and durability, increasing the product's lifespan.

[0025] 7. By adjusting the thickness of different layers in the sealing layer, the air permeability and sealing performance of the bag can be controlled as needed.

[0026] 8. Using BHT antioxidant as a stabilizer can effectively slow down the aging rate of the bags and improve the stability and service life of the products. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 The attached figure is a schematic diagram of the structure of the present invention.

[0029] Figure 2 The attached figure is a schematic diagram of the production process of the present invention.

[0030] Figure 3 The attached figure is a schematic diagram for judging the grade of laser transfer films according to the present invention.

[0031] In the diagram, 1-printed layer, 2-substrate layer, 3-laser layer, 4-sealing layer, 41-encapsulation layer, 42-penetration layer, and 43-adhesive layer. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see the appendix Figure 1 This invention discloses a bag with a laser effect that is resistant to high-temperature cooking.

[0034] Example 1:

[0035] A high-temperature retortible bag with a laser effect comprises, from the outside to the inside, a printing layer 1, a substrate layer 2, a laser layer 3, and a sealing layer 4; wherein the sealing layer is a three-layer composite membrane, the outer layer being an encapsulation layer 41 composed of 96.2 wt% polypropylene and 3.8 wt% stabilizer, the middle layer being a permeation layer 42 composed of 96.2 wt% polystyrene and 3.8 wt% stabilizer, and the inner layer being an adhesive layer 43 composed of 61.8 wt% nitrile rubber, 36.3 wt% polyimide resin, and 1.9 wt% stabilizer.

[0036] It should be noted that the stabilizer is specifically BHT antioxidant.

[0037] It should be noted that the thickness of the encapsulation layer 41 in the sealing layer 4 is 5-6 μm, the thickness of the permeation layer 42 is 9-11 μm, and the thickness of the adhesive layer 43 is 2-5 μm.

[0038] It should be noted that the laser layer 3 is made of zinc.

[0039] It should be noted that the printed layer 1 and the substrate layer 2 are laminated using a solvent-free polyurethane adhesive.

[0040] It should be noted that the viscosity of the polyurethane adhesive is 8500-11500 mPa·s.

[0041] Example 2:

[0042] Based on the laser-effect, high-temperature retort-resistant bag described in Example 1, its production method includes the following steps:

[0043] a. Apply polyurethane adhesive to the areas on substrate layer 2 where a laser effect is desired;

[0044] b. Use an electric engraving roller to transfer the laser transfer film with laser layer 3 to the polyurethane adhesive position on the substrate layer 2 and dry it. Then use a slitting machine to peel off the laser transfer film.

[0045] c. Solvent-free lamination of the sealing layer 4 and the laser layer 3 is performed to obtain the final bag with laser effect and high temperature resistance to retort.

[0046] It should be noted that the laser transfer film is a 10μm thick laser film.

[0047] Example 3:

[0048] The test method for testing the adhesion between the laser layer and the laser transfer film in this invention is as follows:

[0049] Use a cross-cutting tool to score 20 squares on the label surface. After scoring, 20 straight lines with equal spacing will appear. Then, score again perpendicular to the straight lines to create a 20x20 square of 400 squares. The cross-cutting tool should cut all the way to the substrate. After scoring, use tape to test the peeling of the laser layer from the base film. First, apply the tape to the cross-cut area, press it down with your finger to make the tape adhere tightly to the test area, and then quickly tear it off at a 180° angle to the test surface. Observe the peeling of the laser layer.

[0050] Based on the proportion of the detached area to the test area, it is divided into five levels: 5D-1D. Figure 3 As shown, only level 1D meets the requirements of this invention. The determination of each level is as follows:

[0051] 5D: Smooth surface, no peeling on the test surface;

[0052] 4D: A small amount of peeling occurred on the test surface, but the peeling area did not exceed 4% of the test area;

[0053] 3D: There is some peeling on the test surface, but the peeling area accounts for 8%-13% of the test area;

[0054] 2D: There is some peeling on the test surface, but the peeling area accounts for 17%-33% of the test area;

[0055] 1D: There is some peeling on the test surface, but the peeling area accounts for 38%-62% of the test area.

[0056] Tests have shown that a 15μm thick laser film meets the 1D testing requirements of this invention and can achieve the best transfer effect of the laser layer.

[0057] Example 4:

[0058] Tests to verify the laser effect and high-temperature cooking resistance:

[0059] 1. High-temperature cooking test:

[0060] Place the holographic bag into a high-temperature cooker, set the temperature to 100℃, and cook for 30 minutes.

[0061] Observe the changes in the bag during the high-temperature cooking process, including changes in shape and rupture.

[0062] The results showed that the bags remained intact under high-temperature cooking conditions, without deformation or breakage.

[0063] 2. Laser effect test:

[0064] Shine a laser on a bag with a laser effect and observe whether the laser pattern on the bag can clearly reflect light.

[0065] The results showed that the laser pattern on the bag was clearly visible and had a good laser effect.

[0066] 3. Physical performance testing:

[0067] The bag was subjected to a tensile test to measure its tensile strength and elongation at break.

[0068] The results showed that the bag had high tensile strength and good elongation at break, indicating that it had good physical properties and durability.

[0069] The test results above prove that the laser-effect, high-temperature resistant retort bag has high temperature resistance, laser effect, and good physical properties, making it suitable for food packaging and other fields.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bag with a laser-effect and resistant to high-temperature retort, characterized in that, From the outside in, the layers are: a printed layer (1), a substrate layer (2), a laser layer (3), and a sealing layer (4). The sealing layer is a three-layer composite membrane. The outer layer is an encapsulation layer (41), composed of 96.2 wt% polypropylene and 3.8 wt% stabilizer. The middle layer is a permeation layer (42), composed of 96.2 wt% polystyrene and 3.8 wt% stabilizer. The inner layer is an adhesive layer (43), composed of 61.8 wt% nitrile rubber, 36.3 wt% polyimide resin, and 1.9 wt% stabilizer. The thickness of the encapsulation layer (41) in the sealing layer (4) is 5-6 μm, and the thickness of the permeation layer (42) is 9-11 μm. μm, the thickness of the adhesive layer (43) is 2-5μm, the laser layer (3) is made of zinc, the printing layer (1) and the substrate layer (2) are solvent-free composited using polyurethane adhesive; the stabilizer is specifically BHT antioxidant; the viscosity of the polyurethane adhesive is 8500-11500 mPa·s.

2. A method for producing a high-temperature retortible bag with a laser effect as described in claim 1, characterized in that, Includes the following steps: a. Apply polyurethane adhesive to the parts of the substrate layer (2) where a laser effect is required; b. Transfer the laser layer (3) with the laser transfer film to the part of the substrate layer (2) with the polyurethane adhesive and dry it, then peel off the laser transfer film using a slitting machine; c. Solvent-free composite the sealing layer (4) with the laser layer (3) to obtain the final bag with laser effect and high temperature resistance to cooking.

3. A method for producing a high-temperature retortible bag with a laser effect as described in claim 2, characterized in that, The laser transfer film is a 10μm thick laser film.

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