Composite label and manufacturing method

Abstract

The invention discloses a composite label and a manufacturing method, the composite label is composed of first label paper and second label paper, and the first label paper adopts double-sided printing. The composite label is divided into two pieces, the first label paper is printed in a double-face mode, the back face of the first label paper is provided with adhesive sticker, the first label paper can be torn down and then pasted back, reading and subsequent re-storage are facilitated, the back face of the second label paper is used for being pasted to an outer package of a product, and due to the two-piece three-face design, label text printing is facilitated; the specification can be printed on three surfaces, the attractiveness is improved, the market requirement is met, the grade of the composite label reaches 9, the composite label has a very excellent oil-proof effect, meanwhile, the strength performance of the composite label is greatly improved, the tensile strength of the composite label can reach 3.42 kN / m at most, the bursting strength of the composite label is 224 kPa, in addition, the Cobb60 value of the composite label is only 19.8 g / m < 2 > at least, and the composite label has a very good application prospect. The composite label has an excellent waterproof effect and is beneficial to popularization and application.

Description

Technical Field

[0001] The present invention relates to the field of composite label preparation, and in particular to a composite label and a preparation method thereof. Background Art

[0002] The traditional label manufacturing field mainly relies on a single material, usually wood pulp, bamboo pulp or recycled fiber. These composite labels are widely used in daily life and industrial production. However, traditional composite labels have obvious limitations in strength, durability and functionality. For example, ordinary composite labels are easy to tear, deform due to moisture, and have poor oil resistance. These shortcomings limit their use in certain special environments and application scenarios. In addition, most of the labels on the market are single-sided. Sometimes the instructions are too long to be printed completely, so the labels will be printed in a wider or longer style, which is inconvenient and not beautiful enough to paste. If there are products with a small packaging area, they cannot be pasted, resulting in incomplete instructions. Summary of the invention

[0003] In order to solve the above technical problems, a composite label and a production method are provided. The technical solution solves the obvious limitations of the traditional composite labels mentioned in the above background technology in terms of strength, durability and functionality, and most of the labels on the market are single-sided. Sometimes the instructions are too much to be printed completely, and the labels will be printed in a wider or longer style, which is inconvenient and not beautiful to paste; if there is a product with a small packaging area, it cannot be pasted, resulting in incomplete labeling of the instructions.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is: In the first aspect, the present application provides a composite label, which consists of a first label paper and a second label paper, wherein the first label paper is printed on both sides and has a self-adhesive sticker on the back, and the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

[0005] On the other hand, the present application also provides a method for making a composite label, comprising the following steps: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer on the forming wire of the paper machine, with each layer being 40-200gsm in weight, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam to make the internal temperature of the paper sheets reach 35-55°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

[0006] Preferably, the absolute dry matter addition amount of the spraying aid in S2 is 20-80 kg / ton of paper.

[0007] Preferably, the absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener are 15%, 25%, 20%, 20%, and 20%, respectively.

[0008] Preferably, the weight proportions of the components of the absolute dry matter are: 65-85 parts of starch, 5-10 parts of sodium carboxymethyl cellulose, 5-15 parts of styrene-butadiene latex, 5-10 parts of thermosetting resin, and 0.1-0.5 parts of hardener.

[0009] Preferably, the starch is one or a mixture of corn starch, modified corn starch, tapioca starch, or modified tapioca starch.

[0010] Preferably, the thermosetting resin is one or a mixture of more than one of phenolic resin, melamine formaldehyde resin and epoxy resin.

[0011] Preferably, the hardener is one or a mixture of more than one of aliphatic amines, alicyclic amines, low molecular weight polyamides, and modified aromatic amines.

[0012] Preferably, the moisture content of the paper after steam drying in S3 is no more than 9%.

[0013] Preferably, in S4, glazing treatment is performed after printing to increase the glossiness of the printed matter, and die-cutting is performed after the treatment is completed to cut the labels into suitable sizes. After passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

[0014] Compared with the prior art, the present invention provides a composite label and a manufacturing method, which has the following beneficial effects: The composite label in the present invention is divided into two sheets, wherein the first label paper is printed on both sides and has a self-adhesive sticker on the back. The first label paper can be torn off and pasted back for easy reading and subsequent re-storage, and the back of the second label paper is used to be pasted on the outer packaging of the product. The design of two sheets and three sides is convenient for printing the label text, and the instructions can be printed on three sides, which improves the aesthetics and meets the market demand. The composite label in the present invention has a grade of 9 and has a very superior oil-proof effect. At the same time, the strength performance of the composite label has also been greatly improved, and its tensile strength can reach up to 3.42kN / m, and its bursting resistance is 224kPa. In addition, the Cobb60 value of the composite label is only 19.8g / m2 at the lowest, which is much lower than the 46.8g / m2 of the currently sold multi-layer composite labels, and has an excellent waterproof effect. The composite label is conducive to promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the method for making the composite label in the present invention. DETAILED DESCRIPTION

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0017] Example 1 First, please refer to Figure 1 As shown, a composite label is composed of a first label paper and a second label paper, the first label paper is printed on both sides and has a self-adhesive sticker on the back, the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

[0018] Those skilled in the art can understand that, currently most of the labels on the market are single-sided, and sometimes the content of the instruction manual is too much to be printed completely, so the label will be printed in a wider or longer style, which is inconvenient to paste and not beautiful enough; if there is a product with a small packaging area, it cannot be pasted, resulting in incomplete labeling of the instruction manual, and the composite label in the present invention is divided into two sheets, wherein the first label paper is printed on both sides, and there is a self-adhesive sticker on the back, so the first label paper can be torn off and pasted back, which is convenient for reading and subsequent re-storage, and the back of the second label paper is used to paste on the outer packaging of the product, and the design of two sheets with three sides is convenient for printing the label text, and the instruction manual can be printed on three sides, which improves the aesthetics and meets the market demand.

[0019] In a second aspect, the present application also discloses a method for making a composite label, comprising the following steps: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer on the forming wire of the paper machine, with each layer weighing 90gsm, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam so that the internal temperature of the paper sheets reaches 55°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

[0020] Specifically, the absolute dry matter addition amount of the spraying aid in S2 is 80 kg / ton of paper.

[0021] Specifically, the absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener are 15%, 25%, 20%, 20%, and 20%, respectively.

[0022] Specifically, the weight proportions of the components of the absolute dry matter are: 65 parts of starch, 10 parts of sodium carboxymethyl cellulose, 5 parts of styrene-butadiene latex, 5 parts of thermosetting resin, and 0.5 parts of hardener.

[0023] Specifically, the starch is corn starch, modified corn starch, tapioca starch and a mixture of modified tapioca starch.

[0024] Specifically, the thermosetting resin is a mixture of phenolic resin, melamine formaldehyde resin and epoxy resin.

[0025] Specifically, the hardener is a mixture of aliphatic amines, alicyclic amines, low molecular weight polyamides and modified aromatic amines.

[0026] Specifically, the moisture content of the paper after steam drying in S3 is no more than 9%.

[0027] Specifically, in S4, after printing, glazing treatment is performed to increase the glossiness of the printed matter. After the treatment is completed, die-cutting is performed to cut the labels into suitable sizes. After passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

[0028] Example 2 First, please refer to Figure 1 As shown, a composite label is composed of a first label paper and a second label paper, the first label paper is printed on both sides and has a self-adhesive sticker on the back, the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

[0029] In a second aspect, the present application also discloses a method for making a composite label, comprising the following steps: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer of the forming wire on the paper machine, with each layer being 150gsm in weight, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam so that the internal temperature of the paper sheets reaches 55°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

[0030] Specifically, the absolute dry matter addition amount of the spraying aid in S2 is 80 kg / ton of paper.

[0031] Specifically, the absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener are 15%, 25%, 20%, 20%, and 20%, respectively.

[0032] Specifically, the weight proportions of the components of the absolute dry matter are: 85 parts of starch, 5 parts of sodium carboxymethyl cellulose, 15 parts of styrene-butadiene latex, 10 parts of thermosetting resin, and 0.1 parts of hardener.

[0033] Specifically, the starch is corn starch.

[0034] Specifically, the thermosetting resin is a phenolic resin.

[0035] Specifically, the hardener is an aliphatic amine.

[0036] Specifically, the moisture content of the paper after steam drying in S3 is no more than 9%.

[0037] Specifically, in S4, after printing, glazing treatment is performed to increase the glossiness of the printed matter. After the treatment is completed, die-cutting is performed to cut the labels into suitable sizes. After passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

[0038] Example 3 First, please refer to Figure 1 As shown, a composite label is composed of a first label paper and a second label paper, the first label paper is printed on both sides and has a self-adhesive sticker on the back, the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

[0039] In a second aspect, the present application also discloses a method for making a composite label, comprising the following steps: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer on the forming wire of the paper machine, with each layer being 100gsm in weight, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam to make the internal temperature of the paper sheets reach 50°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

[0040] Specifically, the absolute dry matter addition amount of the spraying aid in S2 is 80 kg / ton of paper.

[0041] Specifically, the absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener are 15%, 25%, 20%, 20%, and 20%, respectively.

[0042] Specifically, the weight proportions of the components of the absolute dry matter are: 70 parts of starch, 8 parts of sodium carboxymethyl cellulose, 10 parts of styrene-butadiene latex, 7 parts of thermosetting resin, and 0.3 parts of hardener.

[0043] Specifically, the starch is modified corn starch.

[0044] Specifically, the thermosetting resin is a mixture of phenolic resin and melamine formaldehyde resin.

[0045] Specifically, the hardener is a mixture of aliphatic amines and alicyclic amines.

[0046] Specifically, the moisture content of the paper after steam drying in S3 is no more than 9%.

[0047] Specifically, in S4, after printing, glazing treatment is performed to increase the glossiness of the printed matter. After the treatment is completed, die-cutting is performed to cut the labels into suitable sizes. After passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

[0048] Example 4 First, please refer to Figure 1 As shown, a composite label is composed of a first label paper and a second label paper, the first label paper is printed on both sides and has a self-adhesive sticker on the back, the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

[0049] In a second aspect, the present application also discloses a method for making a composite label, comprising the following steps: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer on the forming wire of the paper machine, with each layer weighing 50gsm, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam so that the internal temperature of the paper sheets reaches 50°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

[0050] Specifically, the absolute dry matter addition amount of the spraying aid in S2 is 60 kg / ton of paper.

[0051] Specifically, the absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener are 15%, 25%, 20%, 20%, and 20%, respectively.

[0052] Specifically, the weight proportions of the components of the absolute dry matter are: 70 parts of starch, 8 parts of sodium carboxymethyl cellulose, 10 parts of styrene-butadiene latex, 7 parts of thermosetting resin, and 0.3 parts of hardener.

[0053] Specifically, the starch is a mixture of corn starch, modified corn starch and tapioca starch.

[0054] Specifically, the thermosetting resin is a mixture of phenolic resin, melamine formaldehyde resin and epoxy resin.

[0055] Specifically, the hardener is a mixture of aliphatic amines, alicyclic amines and low molecular weight polyamides.

[0056] Specifically, the moisture content of the paper after steam drying in S3 is no more than 9%.

[0057] Specifically, in S4, after printing, glazing treatment is performed to increase the glossiness of the printed matter. After the treatment is completed, die-cutting is performed to cut the labels into suitable sizes. After passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

[0058] Example 5 First, please refer to Figure 1 As shown, a composite label is composed of a first label paper and a second label paper, the first label paper is printed on both sides and has a self-adhesive sticker on the back, the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

[0059] In a second aspect, the present application also discloses a method for making a composite label, comprising the following steps: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer of the forming wire on the paper machine, with each layer weighing 60gsm, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam so that the internal temperature of the paper sheets reaches 50°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

[0060] Specifically, the absolute dry matter addition amount of the spraying aid in S2 is 40 kg / ton of paper.

[0061] Specifically, the absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener are 15%, 25%, 20%, 20%, and 20%, respectively.

[0062] Specifically, the weight proportions of the components of the absolute dry matter are: 70 parts of starch, 8 parts of sodium carboxymethyl cellulose, 10 parts of styrene-butadiene latex, 7 parts of thermosetting resin, and 0.3 parts of hardener.

[0063] Specifically, the starch is modified tapioca starch.

[0064] Specifically, the thermosetting resin is a phenolic resin.

[0065] Specifically, the hardener is a low molecular weight polyamide.

[0066] Specifically, the moisture content of the paper after steam drying in S3 is no more than 9%.

[0067] Specifically, in S4, after printing, glazing treatment is performed to increase the glossiness of the printed matter. After the treatment is completed, die-cutting is performed to cut the labels into suitable sizes. After passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

[0068] Example 6 First, please refer to Figure 1As shown, a composite label is composed of a first label paper and a second label paper, the first label paper is printed on both sides and has a self-adhesive sticker on the back, the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

[0069] In a second aspect, the present application also discloses a method for making a composite label, comprising the following steps: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer on the forming wire of the paper machine, with each layer being 100gsm in weight, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam to make the internal temperature of the paper sheets reach 40°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

[0070] Specifically, the absolute dry matter addition amount of the spraying aid in S2 is 60 kg / ton of paper.

[0071] Specifically, the absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin, and hardener are 15%, 25%, 20%, 20%, and 20%, respectively.

[0072] Specifically, the weight proportions of the components of the absolute dry matter are: 70 parts of starch, 8 parts of sodium carboxymethyl cellulose, 10 parts of styrene-butadiene latex, 7 parts of thermosetting resin, and 0.3 parts of hardener.

[0073] Specifically, the starch is modified tapioca starch.

[0074] Specifically, the thermosetting resin is an epoxy resin.

[0075] Specifically, the hardener is an aliphatic amine.

[0076] Specifically, the moisture content of the paper after steam drying in S3 is no more than 9%.

[0077] Specifically, in S4, after printing, glazing treatment is performed to increase the glossiness of the printed matter. After the treatment is completed, die-cutting is performed to cut the labels into suitable sizes. After passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

[0078] Experiments were conducted on the composite label performance in each of the above embodiments: Determination of tensile strength: Determined in accordance with GB / T 453-2002.

[0079] Determination of bursting strength: Determined in accordance with GB / T 454-2002.

[0080] Determination of oil resistance level: TAPPI 559cm-02 "Grease resistance test for paper and paperboard" test method is adopted.

[0081] Determination of Cobb60 value: Determined in accordance with GB / T 1540-2002.

[0082] The oil-proof performance and strength performance of the composite label in each embodiment of the present invention are shown in Table 1 below. We can see that the oil-proof grade of the multi-layer composite label currently sold on the market is grade 1, and the grade of the composite label in each embodiment of the present invention reaches grade 9, which has a very excellent oil-proof effect. At the same time, the strength performance of the composite label is also greatly improved, and its tensile strength can reach up to 3.42kN / m, and its burst resistance is 224kPa. In addition, the Cobb60 value of the composite label is as low as 19.8g / m2, which is much lower than 46.8g / m2 of the multi-layer composite label currently sold on the market, and has an excellent waterproof effect.

[0083] Table 1: In summary, the present invention is combined with experimental data to know that the oil-proof grade of the currently sold multi-layer composite labels is grade 1, while the grade of the composite label in the present invention reaches grade 9, which has a very superior oil-proof effect. At the same time, the strength performance of the composite label is also greatly improved. Compared with the products in Examples 1, 2, 3, 5 and 6, the product in Example 4 has a tensile strength of up to 3.42 kN / m and a bursting strength of 224 kPa. In addition, the Cobb60 value of the composite label is only 19.8 g / m2 at the lowest, which is much lower than 46.8 g / m2 of the currently sold multi-layer composite labels. It has an excellent waterproof effect. The composite label is conducive to promotion and use. The composite label in the present invention is divided into two sheets, wherein the first label paper is printed on both sides and has a self-adhesive sticker on the back. The first label paper can be torn off and glued back for easy reading and subsequent re-collection. The back of the second label paper is used to be pasted on the outer packaging of the product. The design of two sheets and three sides is convenient for printing the label text, and the instructions can be printed on three sides, which improves the aesthetics and meets the market demand.

[0084] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A composite label, characterized in that: The composite label consists of a first label paper and a second label paper, wherein the first label paper is printed on both sides and has a self-adhesive sticker on the back, the second label paper is pasted on the self-adhesive sticker on the back of the first label paper, and the back of the second label paper is used to be pasted on the external product packaging, and the first label paper and the second label paper are both composed of an upper layer, a middle layer and a lower layer structure, the upper layer is made of a flexible fiber material, the middle layer is made of a fiber material embedded with a functional material, and the lower layer is made of a flexible fiber material, the flexible fiber material of the upper layer is wood pulp fiber or bamboo pulp fiber, the functional material of the middle layer is a waterproof coating or an oil-proof coating made of a high-strength fiber material, and the flexible fiber material of the lower layer is wood pulp fiber or bamboo pulp fiber.

2. A method for making a composite label, used for making a composite label according to claim 1, characterized in that: The following steps are involved: S1, after pulping, refining and pulping, the pulp required for making the upper layer, middle layer and lower layer of the composite label is obtained; S2. Dilute the prepared slurry to the required concentration, dehydrate and form each layer on the forming wire of the paper machine, with each layer being 40-200gsm in weight, and spray each layer with an additive for interlayer bonding using a spray device; before laminating each layer of wet paper sheets, heat each layer of wet paper sheets with steam to make the internal temperature of the paper sheets reach 35-55°C; S3, the layers of wet paper sheets are compounded, pressed, steam dried and surface treated to produce the first label paper and the second label paper; S4. Print the contents of the instruction manual on three sides of the first label paper and the second label paper using flexographic printing.

3. The method for making a composite label according to claim 2, characterized in that: The absolute dry matter addition amount of the spraying aid in S2 is 20-80 kg / ton of paper.

4. The method for making a composite label according to claim 2, characterized in that: The absolute dry matter in the auxiliary agent sprayed in S2 is starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin and hardener, and the mass fractions of starch, sodium carboxymethyl cellulose, styrene butadiene latex, thermosetting resin and hardener are 15%, 25%, 20%, 20% and 20% respectively.

5. The method for making a composite label according to claim 4, characterized in that: The weight proportions of the components of the absolute dry matter are: 15 parts of starch, 25 parts of sodium carboxymethyl cellulose, 20 parts of styrene-butadiene latex, 20 parts of thermosetting resin, and 20 parts of hardener.

6. A method for making a composite label according to claim 5, characterized in that: The starch is one of corn starch, modified corn starch, tapioca starch, and modified tapioca starch, or a mixture of more than one of them.

7. The method for making a composite label according to claim 5, characterized in that: The thermosetting resin is one of phenolic resin, melamine formaldehyde resin and epoxy resin or a mixture of more than one of them.

8. The method for making a composite label according to claim 5, characterized in that: The hardener is one or a mixture of aliphatic amines, alicyclic amines, low molecular weight polyamides, and modified aromatic amines.

9. The method for making a composite label according to claim 2, characterized in that: The moisture content of the paper after steam drying in S3 is no more than 9%.

10. The method for making a composite label according to claim 2, characterized in that: In S4, the printing is followed by glazing to increase the glossiness of the printed matter, and after the treatment is completed, die-cutting is performed to cut the labels into suitable sizes, and after passing the quality inspection and being divided into strips, the labels are cut into flat sheets.

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