A paper with high coffee grounds content and a method of making and using the same

Abstract

The application discloses a paper with high coffee residue content and a preparation method and application thereof. The paper can be paper or paperboard, and contains pulp fibers and coffee residue. The beating degree of the pulp fibers is 45-95SR, and the water retention value is 1.4-2.2. The particle size of the coffee residue is 30-500 mesh. The mass percentage of the coffee residue in the paper or paperboard is 40%-90%. The paper can be prepared through the steps of fiber pulp, coffee residue grinding, mixing and molding. The paper can be used for preparing a coffee bag, and the paperboard can be used for preparing a cup sleeve of a coffee cup.

Description

Technical Field

[0001] This invention relates to the field of papermaking technology, and in particular to a paper with high coffee grounds content, its preparation method, and its application. Background Technology

[0002] In the coffee industry, a large amount of coffee grounds are generated when coffee beans are used to make coffee. Currently, the main way to deal with coffee grounds is to discard them as waste or garbage. This not only wastes resources but also increases the workload of environmental protection industries such as waste disposal.

[0003] In the traditional papermaking industry, wood or bamboo are commonly used as raw materials for pulp, which puts a great deal of pressure on the Earth's ecological environment. The need to save paper and thus these raw materials is becoming increasingly urgent.

[0004] Using coffee grounds in the papermaking industry to replace part of the pulp fiber can both process coffee grounds and conserve plant resources used in papermaking. Chinese patent CN112064413A discloses a paper containing coffee grounds, but the raw materials for preparing this paper only include 5%-10% by mass of coffee grounds. The coffee grounds content is low, and during the preparation of this paper, adsorbents, charge regulators, and retention aids must be added; otherwise, various physical properties of the paper, such as paper strength, adsorption capacity, and uniformity, cannot meet the standards. Furthermore, the addition of these additives significantly increases the production cost of the paper and makes the production process more complex. Summary of the Invention

[0005] The purpose of this invention is to provide a paper with a high coffee grounds content, which has a distinct coffee aroma and excellent physical properties such as basis weight, density, tensile strength and bursting strength, while its preparation process is simple.

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

[0007] A type of paper containing coffee grounds, wherein the paper is paper containing pulp fibers and coffee grounds, and the basis weight of the paper is in the range of 15–200 g / m². 2 The density is 0.51–0.9 g / cm³. 3 The tensile strength is 38–65 N·m / g, and the bursting strength is 1.2–2.5 kPa·m. 2 / g; the pulp fiber has a freeness of 45-95SR and a water retention value of 1.4-2.2; the coffee grounds account for 40%-90% of the mass percentage of the paper, and the coffee grounds have a particle size of 30-500 mesh.

[0008] In this invention, the water retention value of the pulp fibers is obtained by testing according to the ISO 23714 standard for pulp water retention value. The water retention value reflects the fineness of the pulp fibers and indicates the strength of the bonding between fibers. Generally, the higher the water retention value, the larger the specific surface area of ​​the pulp fibers, the more exposed hydroxyl groups on the surface of the pulp fibers, and the easier it is to bind water.

[0009] The present invention first provides a paper product, and secondly provides a cardboard product.

[0010] A paper containing coffee grounds, said paper being a paperboard containing pulp fibers and coffee grounds, said paperboard having a basis weight range of 200–4000 g / m². 2 The density is 0.45–0.8 g / cm³. 3 The tensile strength is 25–50 N·m / g, and the bursting strength is 0.9–1.8 kPa·m. 2 / g; the pulp fiber has a freeness of 45-95SR and a water retention value of 1.4-2.2; the coffee grounds account for 40%-90% of the mass percentage of the paperboard, and the coffee grounds have a particle size of 30-500 mesh.

[0011] The present invention also provides a method for preparing the above-mentioned paper containing coffee grounds, the method comprising the following steps: (1) Fiber pulping: (1) Fiber pulping: mixing paper pulp fibers and water, and preparing a pulp with a freeness of 45-95SR after pulping, wherein the water retention value of the pulp is 1.4-2.2; (2) Coffee grounds grinding: grinding coffee grounds to obtain coffee grounds powder with a particle size of 30-500 mesh; (3) Mixing: mixing the pulp, the coffee grounds powder and water to obtain coffee grounds pulp; (4) Molding: molding the coffee grounds pulp to obtain the paper containing coffee grounds.

[0012] In some embodiments, in step (1), the pulp fiber is selected from one or more of wood pulp fiber, bamboo pulp fiber, cotton pulp fiber, hemp pulp fiber, straw pulp fiber, waste paper pulp fiber, reed pulp fiber, and sugarcane pulp fiber.

[0013] In some embodiments, in step (2), the grinding is carried out in a disc mill or a powder crusher.

[0014] In some embodiments, in step (3), the ratio of the total mass of the slurry and the coffee grounds powder to the mass of the water is 0.5:99.5-2:98.

[0015] In some embodiments, the forming is a sheet wet forming process to obtain the paper containing coffee grounds.

[0016] In some embodiments, the preparation method further includes pressing, drying, and winding the sheet after wet forming.

[0017] The present invention also provides the application of the paper containing coffee grounds in the manufacture of coffee cup tote bags. In this invention, a coffee cup tote bag refers to a bag used to hold coffee cups and carried by hand.

[0018] This invention also provides an application of the cardboard containing coffee grounds for preparing coffee cup sleeves. In this invention, a coffee cup sleeve refers to a product that is fitted over part of a coffee cup, and it typically has functions such as anti-slip and anti-scalding.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] This invention controls the beating degree of pulp fibers to 45-95SR and the water retention value to 1.4-2.2, using coffee grounds with a particle size of 30-500 mesh. This results in pulp fibers with a high specific surface area and a distinct microfibrillated state, allowing them to effectively capture and encapsulate high-content coffee grounds. Consequently, it enables the production of high-coffee-ground paper without the addition of additional additives such as retention aids. This paper product can be in the form of paper or paperboard, a feat impossible with existing technologies. The paper of this invention, due to its high coffee grounds content, possesses a distinct coffee aroma. Besides its applications in general papermaking, it is particularly suitable for the coffee industry. For example, the paper can be used to make carrying bags for coffee cups, and the paperboard can be used to make cup sleeves. This allows the coffee industry, especially coffee shops, to fully utilize coffee grounds waste while reducing packaging costs and enhancing the elegance and aroma of the packaging.

[0021] This invention also makes specific selections of various physical properties of the paper, enabling it to be used to make carrying bags for coffee cups, capable of withstanding the weight of the coffee cup and the coffee. The inventors discovered that when the paper's basis weight ranges from 15 to 200 g / m³... 2 The density is 0.5–0.9 g / cm³. 3 The tensile strength is 30–65 N·m / g, and the bursting strength is 1.1–2.5 kPa·m. 2 When the paper is at a certain value, it is particularly suitable for use in making coffee tote bags. However, if the physical properties of the paper do not meet the above-mentioned range, it is difficult to use it for the aforementioned specific purpose.

[0022] This invention also makes specific selections of various physical properties of the paperboard, enabling it to be used in the manufacture of coffee cup sleeves. The inventors discovered that when the basis weight of the paperboard is in the range of 200–4000 g / m³, 2The density is 0.5–0.8 g / cm³. 3 The tensile strength is 25–50 N·m / g, and the bursting strength is 0.9–1.8 kPa·m. 2 When the paperboard is at a certain value, it is particularly suitable for making cup sleeves for coffee cups. However, if the physical properties of the paper do not meet the above-mentioned range, it is difficult to use it for the aforementioned specific purposes.

[0023] The paper production process of this invention is simple and does not require the addition of other additives. Detailed Implementation

[0024] Example 1

[0025] This embodiment provides a type of paper, the preparation method of which is as follows:

[0026] (1) Fiber pulping: Pulp fibers and water are mixed and beaten to prepare a pulp with a freeness of 45SR. The water retention value of the pulp is 1.4 and the mass ratio of pulp fibers to water is 1:100.

[0027] (2) Coffee grounds abrasive: coffee grounds are ground to obtain coffee grounds powder with a particle size of 30 mesh;

[0028] (3) Mixing: Mix the pulp, coffee grounds powder and water to obtain coffee grounds pulp, wherein the mass ratio of pulp fiber in step (1) to coffee grounds powder in step (3) is 6:4, and the mass ratio of the total mass of pulp and coffee grounds powder to the mass of water is 0.5:99.5.

[0029] (4) Sheet wet forming: The coffee grounds slurry is wet formed, pressed, dried and rolled to obtain paper containing coffee grounds.

[0030] The types of pulp fibers and the specific values ​​of each process parameter are shown in Table 1.

[0031] The test method for the water retention value of the slurry is as follows:

[0032] Perform the procedure according to ISO 23714, "Determination of Water Retention Value of Pulp".

[0033] Examples 2-8

[0034] The process is basically the same as in Example 1, except that the types of pulp fibers and the specific values ​​of each process parameter are different, as detailed in Table 1.

[0035] In Examples 2-4, paper was also prepared, while in Examples 5-8, paperboard was prepared.

[0036] Comparative Example 1

[0037] The process is basically the same as in Example 1, except that the beating degree of the pulp fiber is replaced with 40.

[0038] Comparative Example 2

[0039] The method is basically the same as in Example 1, except that the water retention value of the pulp fiber is replaced with 1.1.

[0040] Comparative Example 3

[0041] The method is basically the same as in Example 1, except that the water retention value of the pulp fiber is replaced with 1.3.

[0042] Comparative Example 4

[0043] The process is basically the same as in Example 1, except that the particle size of the coffee grounds is replaced with 20 mesh.

[0044] Comparative Example 5

[0045] The process is basically the same as in Example 5, except that the beating degree of the pulp fiber is replaced with 40.

[0046] Comparative Example 6

[0047] The method is basically the same as in Example 5, except that the water retention value of the pulp fiber is replaced with 1.1.

[0048] Comparative Example 7

[0049] The method is basically the same as in Example 5, except that the water retention value of the pulp fiber is replaced with 1.3.

[0050] Comparative Example 8

[0051] The process is basically the same as in Example 5, except that the particle size of the coffee grounds is replaced with 20 mesh.

[0052] Table 1 Preparation conditions of Examples 1-8

[0053]

[0054]

[0055] The paper prepared in Examples 1-4 and Comparative Examples 1-4, and the paperboard prepared in Examples 5-8 and Comparative Examples 5-8, were tested for basis weight using the standard GBT451.2-2002 "Determination of Basis Weight of Paper and Paperboard", the density was tested using the GBT451.2 standard for basis weight of paper and paperboard, the tensile strength was tested using the GBT-12914 standard for tensile strength of paper and paperboard, and the bursting strength was tested using the GBT454 standard for bursting strength of paper. The results are shown in Table 2.

[0056] Table 2. Paper properties of examples and comparative examples

[0057]

[0058] Using existing conventional techniques to prepare a tote bag from the paper of Example 1, it was found that the tote bag could be used to hold one or two cups of coffee. However, using the same techniques to prepare a tote bag from the paper of Comparative Example 1, it was found that the tote bag would break when used to hold one cup of coffee.

[0059] Using existing conventional techniques to prepare coffee cup sleeves with the cardboard of Example 5, it was found that the coffee cup sleeves would not break during use. However, using the same techniques to prepare coffee cup sleeves with the cardboard of Comparative Example 6, it was found that the coffee cup sleeves were prone to breakage during actual use.

[0060] It is known that by controlling the beating degree of the pulp fibers to 45-95SR and the water retention value to 1.4-2.2, and by selecting coffee grounds with a particle size of 30-500 mesh, the present invention can produce paper or paperboard with a mass percentage of up to 40% or more of coffee grounds. Moreover, the paper or paperboard has excellent physical properties and can be used in various application scenarios. Among them, the paper has higher strength and is especially suitable for making coffee cup tote bags, while the paperboard has medium strength and is especially suitable for making coffee cup sleeves.

Claims

1. A paper containing coffee grounds, wherein the paper is paper, characterized in that: The paper is composed of pulp fibers and coffee grounds, and its basis weight ranges from 15 to 80 g / m². 2 The density is 0.51~0.59 g / cm. 3 The tensile strength is 38~51 N·m / g, and the bursting strength is 1.2~1.7 kPa·m. 2 / g; the pulp fiber has a freeness of 45SR and a water retention value of 1.4-1.43; the coffee grounds account for 40% of the mass of the paper and have a particle size of 30 mesh; the pulp fiber is selected from one or more of wood pulp fiber, bamboo pulp fiber, cotton pulp fiber, hemp pulp fiber, and straw pulp fiber; The paper is prepared by wet forming.

2. A type of paper containing coffee grounds, wherein the paper is paperboard, characterized in that: The paperboard is composed of pulp fibers and coffee grounds, and its basis weight ranges from 200 to 500 g / m². 2 The density is 0.5~0.6g / cm. 3 The tensile strength is 35~48 N·m / g, and the bursting strength is 0.9~1.2 kPa·m. 2 / g; the pulp fiber has a freeness of 45SR and a water retention value of 1.4-1.43; the coffee grounds account for 40%~50% of the paperboard by mass, and the coffee grounds have a particle size of 30 mesh; the pulp fiber is selected from one or more of wood pulp fiber, bamboo pulp fiber, cotton pulp fiber, hemp pulp fiber, and straw pulp fiber; The paperboard is prepared by wet molding.

3. The method for preparing paper containing coffee grounds as described in claim 1 or 2, characterized in that: The preparation method includes the following steps: (1) Fiber pulping: mixing paper pulp fibers and water, and preparing a pulp with a freeness of 45SR after pulping, wherein the water retention value of the pulp is 1.4-1.43; (2) Coffee grounds grinding: grinding coffee grounds to obtain coffee grounds powder with a particle size of 30 mesh; (3) Mixing: mixing the pulp, the coffee grounds powder and water to obtain coffee grounds pulp; (4) Molding: wet molding the coffee grounds pulp into sheets to obtain the paper containing coffee grounds.

4. The preparation method according to claim 3, characterized in that: In step (3), the ratio of the total mass of the slurry and the coffee grounds powder to the mass of the water is 0.5:99.5-2:

98.

5. The preparation method according to claim 3, characterized in that: In step (2), the grinding is carried out in a disc mill or a powder crusher.

6. The use of the paper containing coffee grounds as described in claim 1 for the manufacture of coffee cup tote bags.

7. The use of the paper containing coffee grounds as described in claim 2 for making coffee cup sleeves.

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