A pulp molded product with high coffee grounds content, its preparation method and application

Abstract

This invention discloses a pulp molded product with high coffee grounds content, its preparation method, and its application. It contains pulp fibers and coffee grounds. The pulp fibers have a freeness of 25-45SR and a water retention value of 1.25-1.4. The coffee grounds constitute 30%-60% of the mass of the pulp molded product, and the particle size of the coffee grounds is 30-500 mesh. This pulp molded product can be prepared through fiber pulp, coffee grounds abrasive, mixing, and molding steps. The pulp molded product of this invention is particularly suitable for use as a coffee cup saucer.

Description

Technical Field

[0001] This invention relates to the field of papermaking technology, and in particular to a molded pulp product 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 paper industry to replace part of the pulp fiber can both process coffee grounds and conserve plant resources used for papermaking. While paper containing coffee grounds exists in existing technology, molded pulp products containing coffee grounds do not yet exist. Summary of the Invention

[0005] The purpose of this invention is to provide a pulp molding product with high coffee grounds content, which has a distinct coffee aroma, can meet various application scenarios, and has a simple preparation process.

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

[0007] A pulp molded article containing coffee grounds, the pulp molded article containing pulp fibers and coffee grounds; the pulp fibers have a freeness of 25-45SR and a water retention value of 1.25-1.4; the coffee grounds account for 30%-60% of the mass percentage of the pulp molded article, 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 determining the water retention value of pulp. 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 higher the percentage of coffee grounds in a pulp molded product, the lower the strength of the pulp molded product is usually. In order to make the aforementioned pulp molded products containing coffee grounds practically applicable, this invention controls the content of coffee grounds to be 30% to 60%, thereby achieving practically usable pulp molded products while reducing costs and preserving the aroma of coffee.

[0010] The present invention also provides a method for preparing the above-mentioned pulp molded article containing coffee grounds, the method comprising the following steps: (1) fiber pulping: mixing pulp fibers and water, beating and preparing a pulp with a freeness of 25 to 45SR, wherein the water retention value of the pulp is 1.25 to 1.4; (2) coffee grounds grinding: grinding coffee grounds to obtain coffee grounds powder with a particle size of 30 to 500 mesh; (3) mixing: mixing the pulp, the coffee grounds powder and water to obtain coffee grounds slurry; (4) molding: molding the coffee grounds slurry to obtain the pulp molded article containing coffee grounds.

[0011] 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.

[0012] In some embodiments, in step (2), the grinding is carried out in a disc mill or a powder crusher.

[0013] 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.

[0014] In some embodiments, the molding is pulp molding to obtain the pulp molded article containing coffee grounds.

[0015] In some embodiments, the preparation method further includes the steps of demolding, drying, and hot pressing after the pulp is molded.

[0016] The present invention also provides the application of the pulp molded article containing coffee grounds in the preparation of coffee cup saucers.

[0017] In this invention, the coffee cup holder refers to a base used to support or hold a coffee cup, which typically has a certain height and depth adapted to accommodate the coffee cup. When coffee shops deliver coffee, they usually place the coffee cup in a coffee cup holder to prevent spillage.

[0018] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0019] This invention controls the beating degree of pulp fibers to 25-45SR and the water retention value to 1.25-1.4, using coffee grounds with a particle size of 30-500 mesh. This results in pulp fibers with a high specific surface area and a distinctly porous microstructure, allowing for the effective adsorption of high coffee grounds. Consequently, it enables the production of high-coffee-ground molded pulp products without the addition of additional additives such as retention aids, a technology not yet available in the prior art. Due to their high coffee grounds content, the molded pulp products of this invention possess a pronounced coffee aroma. Besides their general applications in molded pulp products, they are particularly suitable for the coffee industry. For example, they can be used to manufacture coffee cup saucers. This allows the coffee industry, especially coffee shops, to fully utilize coffee grounds waste while reducing packaging costs and enhancing packaging elegance and coffee aroma.

[0020] In addition to being applicable to conventional fields, the pulp molded articles of the present invention are particularly suitable for the preparation of coffee cup saucers.

[0021] The production process for preparing pulp molded products according to the present invention is simple and does not require the addition of other additives. Detailed Implementation

[0022] Example 1

[0023] This embodiment provides a molded pulp product, the preparation method of which is as follows:

[0024] (1) Fiber pulping: Pulp fibers and water are mixed and beaten to prepare a pulp with a freeness of 25SR. The water retention value of the pulp is 1.25 and the mass ratio of pulp fibers to water is 1:100.

[0025] (2) Coffee grounds abrasive: coffee grounds are ground to obtain coffee grounds powder with a particle size of 30 mesh;

[0026] (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.

[0027] (4) The coffee grounds pulp is molded into paper pulp, demolded, dried, and hot-pressed to obtain a paper pulp molded product containing coffee grounds. The mold is a coffee cup base, and the product is a coffee cup base.

[0028] The types of pulp fibers and the specific values ​​of each process parameter are shown in Table 1.

[0029] The test method for the water retention value of the slurry is as follows:

[0030] Perform the procedure according to ISO 23714, "Determination of Water Retention Value of Pulp".

[0031] Examples 2-4

[0032] 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.

[0033] Comparative Example 1

[0034] The basic principle is the same as in Example 1, except that the beating degree of the pulp fiber is replaced with 20SR.

[0035] Comparative Example 2

[0036] 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.

[0037] Comparative Example 3

[0038] The method is basically the same as in Example 1, except that the water retention value of the pulp fiber is replaced with 1.5.

[0039] Comparative Example 4

[0040] The process is basically the same as in Example 1, except that the particle size of the coffee grounds is replaced with 20 mesh.

[0041] Table 1 Preparation conditions of Examples 1-4

[0042]

[0043]

[0044] When the coffee cup base products obtained in Examples 1-4 were used to hold coffee cups filled with coffee, it was found that they were not easily deformed even after one day. However, when the coffee cup base products prepared in Comparative Examples 1-4 were used to hold the same coffee cups filled with coffee, it was found that the base products could not support the cups from the beginning and deformed severely, which was due to their low strength.

[0045] Furthermore, when the beating degree is greater than 45SR, the paper-plastic production efficiency will decrease by half and the energy consumption will double. When the beating degree is less than 25SR, the powder addition cannot reach more than 30%. When the powder is forcibly added to more than 30%, the resulting paper-plastic has poor strength and is prone to deformation and collapse.

[0046] It is understood that by controlling the beating degree of pulp fibers to 25-45SR and the water retention value to 1.25-1.4, and by selecting coffee grounds with a particle size of 30-500 mesh, the present invention can make the prepared pulp molded products usable in practical applications, especially suitable for the application of coffee cup saucers.

Claims

1. A molded pulp article containing coffee grounds, characterized by: The pulp molded product is composed of pulp fibers and coffee grounds; the pulp fibers have a freeness of 25SR and a water retention value of 1.25~1.27; the coffee grounds account for 30%~60% of the mass of the pulp molded product, and the coffee grounds have a particle size of 30 mesh; the pulp fibers are selected from one or more of wood pulp fibers, bamboo pulp fibers, cotton pulp fibers, and hemp pulp fibers. The pulp molded product is prepared by pulp molding.

2. The method of producing a pulp molded product containing coffee grounds according to claim 1, characterized by: The preparation method includes the following steps: (1) Fiber pulping: Pulp fibers and water are mixed and pulped to obtain a pulp with a freeness of 25SR and a water retention value of 1.25-1.27; (2) Coffee grounds grinding: Coffee grounds are ground to obtain coffee grounds powder with a particle size of 30 mesh; (3) Mixing: The pulp, the coffee grounds powder and water are mixed to obtain coffee grounds pulp; (4) Molding: The coffee grounds pulp is molded to obtain the molded pulp product containing coffee grounds.

3. The preparation method according to claim 2, 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).

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

5. The use of the pulp molded article containing coffee grounds as described in claim 1 for the preparation of coffee cup saucers.

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