Method for producing degradable mulching film paper by utilizing bamboo fibers and coffee grounds

Abstract

The invention discloses a method for producing degradable mulching film paper by utilizing bamboo fibers and coffee grounds, and solves the technical problem that the raw material source of the degradable mulching film paper is relatively limited. The method comprises the steps of cooking, washing, pulping, burdening, forming on a net, squeezing, sizing, drying, reeling, rewinding and packaging, the raw materials adopt 90% by mass of bamboo fibers and 10% by mass of coffee grounds, the raw materials are pulped at a high concentration of 10%-15% and then ground into pulp through a thick disc mill, then the pulp is formed on the net, the concentration of the net is set to be 0.35%-0.5%, and the pH value of the net is set to be 6.5-7.5. The bamboo fibers and the coffee grounds are used as the raw materials, so that the raw material sources of the mulching film paper are enriched, and the performance of the mulching film paper is improved to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of pulping and papermaking, and in particular to a method for producing degradable mulch paper by utilizing bamboo fibers and coffee grounds. Background Art

[0002] The application of mulch film can meet the needs of keeping crops warm and retaining moisture, maintaining fertility and increasing entropy. However, since plastic mulch film is difficult to decompose in the natural environment, it is scattered in the soil and the natural environment, destroying the soil structure and causing white pollution to the soil and the environment.

[0003] The agricultural paper-based film is made of plant fiber as the basic raw material. Wet strength agent, preservative, transparent agent and other additives are added to the pulp. The base paper is made by conventional papermaking process, and then processed to make the paper have the mechanical strength, light transmission, water permeability, heat preservation, warming, moisture retention or other functions required by the film. In addition to the general functions of polyethylene film, it also has certain water resistance, corrosion resistance, air permeability, water permeability, crop lateral root penetration and soil holding performance. It can not only maintain water and soil, concentrate nutrients, prevent soil compaction, but also prevent pests and diseases, and inhibit and remove weeds. Therefore, the development and use of this multifunctional paper-based film is an effective way to solve the problem of long-term use of polyethylene film, which causes a decrease in soil organic fertilizer, reduced crop yields and environmental pollution.

[0004] Although paper-based mulch has abundant raw materials and low production costs, compared with plastic mulch, the dry and wet strength and light transmittance of paper-based mulch produced in the prior art are poor, which leads to poor photosynthesis efficiency and slow metabolism of crops, affecting the normal growth of crops, causing malnutrition and even withering of crops. This is the main technical problem that paper-based mulch needs to solve.

[0005] my country has abundant non-wood resources. Bamboo has obvious zonal and regional characteristics. Bamboo is a medium-long fiber raw material with a large aspect ratio, high cellulose content, and low ash content (higher than wood). It is an excellent papermaking fiber raw material.

[0006] The fiber cells of bamboo raw materials generally account for 60%~70% of the total cell area, which is slightly lower than wood and higher than general grass. The fiber morphology of bamboo is different from that of wood. Wood fibers have pits, while bamboo fibers have few and small pits. The fiber characteristics of bamboo are similar to those of hardwood, which are better than general grasses. In addition, the fiber morphology of bamboo raw materials is not much different between species and genera. The comprehensive morphological characteristics of bamboo fibers are: slender fibers, thick walls, small cavities, high density, relatively stiff fibers, and high transparency. Bamboo fiber has strong UV resistance. The UV transmittance of bamboo raw fibers is less than 5% in the area of ​​200~400m. It also has antibacterial properties, good usability and green environmental protection. It is a natural environmentally friendly green fiber. In this case, if degradable mulch paper can be produced with bamboo fiber and coffee grounds as raw materials, it is expected to expand the source of raw materials and improve product performance. Summary of the invention

[0007] The object of the present invention is to provide a method for producing degradable mulch paper by using bamboo fibers and coffee grounds, so as to solve the technical problem that the raw material sources of degradable mulch paper in the prior art are relatively limited.

[0008] To achieve the above object, the present invention provides the following technical solutions: The present invention provides a method for producing degradable mulch paper by utilizing bamboo fiber and coffee grounds. The method comprises the steps of steaming, washing, beating, batching, web-forming, pressing, gluing, drying, winding, rewinding and packaging. The method is characterized in that the raw materials are 90% bamboo fiber and 10% coffee grounds by mass. The raw materials are pulped at a high concentration of 10%-15% and then refined by a concentrated disc mill. The web-forming concentration is set to 0.35%-0.5%, and the web pH value is 6.5-7.5.

[0009] Further, the following steps are included: S1. Pulping: including material selection, chipping, screening, liquid addition, steaming, washing, and pulp screening; in the pulping process, the original fiber characteristics are maintained; S2. Beating: the screened pulp is beaten at a high concentration of 10%-15%, and the beating degree after beating is 32-38°SR. Then the pulp is beaten by a double disc mill, and the beating degree after beating is 45-52°SR. S3, ingredients: adding reinforcing starch, dry strength agent, wet strength agent, retention aid, filter aid, and neutral gum to the pulp; S4, Internet forming: set the Internet concentration to 0.35%-0.5%, and the Internet pH value to 6.5-7.5; S5. Pressing: Pressing is performed in the four-roll three-press zone, and the pressing line pressure value is set. The dryness after pressing is 42%-45%; S6, Gluing: S7, drying: placing the paper sheets in the upper cylinder for drying; S8, coiling, rewinding and packaging.

[0010] Furthermore, the step S1 specifically includes the following steps: S11. Material selection: Moso bamboo and Phyllostachys edulis are selected as raw materials; S12, chipping: slicing the raw material; S13, screening: selecting bamboo chips with a length of 20-35 mm as bamboo chips for pulping; S14, adding liquid: mixing bamboo chips and coffee grounds evenly to form a mixed raw material, and then adding alkali solution to stir; S15, steaming: gradually add steam to the cooking pot to the set temperature, keep it warm for 60 minutes, then put it into the spray pot to make pulp; S16, pulp washing: the pulp after steaming is pumped to a double-roll double-roll pulp washer for pulp washing; S17, pulp screening: including the first pulp screening and the second pulp screening.

[0011] Furthermore, in step S14, the weight ratio of the mixed raw material to the alkali solution is 1:3.5, wherein the water content of the mixed raw material accounts for 53%.

[0012] Furthermore, in step S15, the specific temperature setting process is to increase the temperature from 70°C to 120°C by adding steam, which takes 60 minutes; from 120°C to 140°C, which takes 30 minutes; and from 140°C to 165°C, which takes 60 minutes.

[0013] Furthermore, between the batching step and the screen forming step, a pulp screening step is also included, in which a pressure screen is used to screen the pulp and separate impurities.

[0014] Furthermore, in step S5, the pressing line pressure values ​​are: 70 kn / m for the first press, 90 kn / m for the second press, and 140 kn / m for the third press.

[0015] Furthermore, the obtained ground film paper has a basis weight of 40-80 g / m 2 , paper dryness is 8%-9%, air permeability is 15-60um / Pa•s, longitudinal tensile strength is 1.2-3.2kN / m, transverse tensile strength is 0.8-2kN / m, water absorption value is 35-50g / m 2 , paper density 0.4-0.5g / m 3 .

[0016] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects: (1) The method for producing degradable mulch paper using bamboo fiber and coffee grounds provided by the present invention changes the raw materials from wood pulp to bamboo fiber + coffee grounds, thus broadening the source of raw materials.

[0017] (2) The method for producing degradable mulch paper using bamboo fiber and coffee grounds provided by the present invention has greatly improved air permeability, good heat sealing, light blocking, heat resistance and aroma retention due to the characteristics of bamboo fiber and coffee grounds themselves and the change of pulping process. The paper has a smooth and beautiful appearance.

[0018] (3) The method for producing degradable mulch paper using bamboo fibers and coffee grounds provided by the present invention is in line with the national concept of green ecological economic development and is conducive to the coordinated development of ecological protection and market economy. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] The objective of the present invention is achieved through the following technical solutions: Example

[0021] Select low-priced and widely available bamboo and coffee grounds as basic raw materials; select qualified bamboo chips of 30-50 mm after chipping and put them into the steaming pot for steaming; mix the bamboo chips and coffee grounds evenly to make a mixed raw material, and mix and stir the mixed raw material and alkali solution at a ratio of 1:3.5 before steaming, wherein the water content of the mixed raw material accounts for 53%; gradually add steam to the steaming pot to the set temperature, and the temperature change process and time include: raising the temperature from 70℃ to 120℃ by adding steam, and the time taken is 60min; raising the temperature from 120℃ to 120℃ The temperature is raised to 140°C in 30 minutes; it takes 60 minutes to raise the temperature from 140°C to 165°C; the heat preservation time is 60 minutes, and after the heat preservation, it is sprayed into the spray pot to make pulp; the pulp after steaming is pumped to the pulp washing pool for pulp washing; after pulp washing, the pulp is screened, and the screening includes the first screening and the second screening. The second screening uses a slag washing machine to screen out the slag contained in the bamboo fiber and coffee grounds, and the slag is crushed by a disc mill and the washing and screening operations are repeated; finally, the obtained bamboo fiber and coffee grounds are used for papermaking.

[0022] Use 10%-15% high-concentration pulping with a beating degree of 28°SR and a double-disc grinding pulping to a pulping degree of 38°SR; add enhanced starch, retention aid, dry strength agent, filter aid, wet strength agent, neutral glue and other auxiliary materials to bamboo fiber and coffee grounds for stirring; then use a pressure screen to screen the pulp and separate impurities; put it on the screen through a floating sheet headbox to form the surface, set the surface concentration to 0.35%, and the surface pH value to 6.5; after the surface is formed, it is pressed by four rollers and three pressure zones, and the pressing line pressure value is set: the first pressure is 70kn / m, the second pressure is 90kn / m, and the third pressure is 140kn / m; place the paper sheet on the upper cylinder for drying: winding, rewinding, and packaging, and the obtained ground film paper has a basis weight of 70g / m 2 , paper dryness is 8%-9%, air permeability is 25um / Pa•s, longitudinal tensile strength is 2.25kN / m, transverse tensile strength is 1.4kN / m, water absorption value is 36g / m 2 , paper density 0.4g / m 3 .

[0023] Embodiment 2: Select low-priced and widely available bamboo and coffee grounds as basic raw materials; select qualified bamboo chips of 30-50 mm after chipping and put them into the steaming pot for steaming; mix the bamboo chips and coffee grounds evenly to make a mixed raw material, and mix and stir the mixed raw material and alkali solution at a ratio of 1:3.5 before steaming, wherein the water content of the mixed raw material accounts for 53%; gradually add steam to the steaming pot to the set temperature, and the temperature change process and time include: raising the temperature from 70℃ to 120℃ by adding steam, and the time taken is 60min; raising the temperature from 120℃ to 120℃ The temperature is raised to 140°C in 30 minutes; it takes 60 minutes to raise the temperature from 140°C to 165°C; the heat preservation time is 60 minutes, and after the heat preservation, it is sprayed into the spray pot to make pulp; the pulp after steaming is pumped to the pulp washing pool for pulp washing; after pulp washing, the pulp is screened, and the screening includes the first screening and the second screening. The second screening uses a slag washing machine to screen out the slag contained in the bamboo fiber and coffee grounds, and the slag is crushed by a disc mill and the washing and screening operations are repeated; finally, the obtained bamboo fiber and coffee grounds are used for papermaking.

[0024] Use 10%-15% high-concentration pulping with a beating degree of 37°SR and a double-disc grinding pulping to a pulping degree of 47°SR; add enhanced starch, retention aid, dry strength agent, filter aid, wet strength agent, neutral glue and other auxiliary materials to bamboo fiber and coffee grounds for stirring; then use a pressure screen to screen the pulp and separate impurities; put it on the screen through a floating sheet headbox to form the surface, set the surface concentration to 0.4%, and the surface pH value to 6.7; after the surface is formed, it is pressed by four rollers and three pressure zones, and the pressing line pressure value is set: the first pressure is 70kn / m, the second pressure is 90kn / m, and the third pressure is 140kn / m; place the paper sheet on the upper cylinder for drying: winding, rewinding, and packaging, and the obtained ground film paper has a basis weight of 70g / m 2, paper dryness is 8%-9%, air permeability is 27um / Pa•s, longitudinal tensile strength is 2.5kN / m, transverse tensile strength is 1.5kN / m, water absorption value is 38g / m 2 , paper density 0.41g / m 3 .

[0025] Embodiment 3: Select low-priced and widely available bamboo and coffee grounds as basic raw materials; select qualified bamboo chips of 30-50 mm after chipping and put them into the steaming pot for steaming; mix the bamboo chips and coffee grounds evenly to make a mixed raw material, and mix and stir the mixed raw material and alkali solution at a ratio of 1:3.5 before steaming, wherein the water content of the mixed raw material accounts for 53%; gradually add steam to the steaming pot to the set temperature, and the temperature change process and time include: raising the temperature from 70℃ to 120℃ by adding steam, and the time taken is 60min; raising the temperature from 120℃ to 120℃ The temperature is raised to 140°C in 30 minutes; it takes 60 minutes to raise the temperature from 140°C to 165°C; the heat preservation time is 60 minutes, and after the heat preservation, it is sprayed into the spray pot to make pulp; the pulp after steaming is pumped to the pulp washing pool for pulp washing; after pulp washing, the pulp is screened, and the screening includes the first screening and the second screening. The second screening uses a slag washing machine to screen out the slag contained in the bamboo fiber and coffee grounds, and the slag is crushed by a disc mill and the washing and screening operations are repeated; finally, the obtained bamboo fiber and coffee grounds are used for papermaking.

[0026] Use 10%-15% high-concentration pulping with a beating degree of 34°SR and a double-disc grinding pulping to a pulping degree of 45°SR; add enhanced starch, retention aid, dry strength agent, filter aid, wet strength agent, neutral glue and other auxiliary materials to bamboo fiber and coffee grounds for stirring; then use a pressure screen to screen the pulp and separate impurities; put it on the screen through a floating sheet headbox to form the screen, set the screen concentration to 0.5%, and the screen pH value to 7.5; after the screen is formed, it is pressed by four rollers and three pressure zones, and the pressing line pressure value is set: the first pressure is 70kn / m, the second pressure is 90kn / m, and the third pressure is 140kn / m; place the paper sheet on the upper cylinder for drying: winding, rewinding, and packaging, and the obtained ground film paper has a basis weight of 65g / m 2 , paper dryness is 8%-9%, air permeability is 27um / Pa•s, longitudinal tensile strength is 2.7kN / m, transverse tensile strength is 1.6kN / m, water absorption value is 42g / m 2 , paper density 0.47g / m 3 .

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A method for producing degradable mulch paper using bamboo fiber and coffee grounds, characterized in that: The method is produced through the processes of steaming, washing, beating, batching, screen forming, pressing, gluing, drying, winding, rewinding and packaging. The method is characterized in that the raw materials are 90% bamboo fiber and 10% coffee grounds by mass, which are pulped at a high concentration of 10%-15% and then refined by a concentrated disc mill, and then screen forming is performed. The screen concentration is set to 0.35%-0.5%, and the screen pH value is 6.5-7.

5.

2. The method for producing degradable mulch paper using bamboo fiber and coffee grounds according to claim 1, characterized in that: The following steps are involved: S1. Pulping: including material selection, chipping, screening, liquid addition, steaming, washing, and pulp screening; in the pulping process, the original fiber characteristics are maintained; S2. Beating: the screened pulp is beaten at a high concentration of 10%-15%, and the beating degree after beating is 32-38°SR. Then the pulp is beaten by a double disc mill, and the beating degree after beating is 45-52°SR. S3, ingredients: adding reinforcing starch, dry strength agent, wet strength agent, retention aid, filter aid, and neutral gum to the pulp; S4, Internet forming: set the Internet concentration to 0.35%-0.5%, and the Internet pH value to 6.5-7.5; S5. Pressing: Pressing is performed in the four-roll three-press zone, and the pressing line pressure value is set. The dryness after pressing is 42%-45%; S6, Gluing: S7, drying: placing the paper sheets in the upper cylinder for drying; S8, coiling, rewinding and packaging.

3. The method for producing degradable mulch paper using bamboo fibers and coffee grounds according to claim 2, characterized in that: The step S1 specifically includes the following steps: S11. Material selection: Moso bamboo and Phyllostachys edulis are selected as raw materials; S12, chipping: slicing the raw material; S13, screening: selecting bamboo chips with a length of 20-35 mm as bamboo chips for pulping; S14, adding liquid: mixing bamboo chips and coffee grounds evenly to form a mixed raw material, and then adding alkali solution to stir; S15, steaming: gradually add steam to the cooking pot to the set temperature, keep it warm for 60 minutes, then put it into the spray pot to make pulp; S16, pulp washing: the pulp after steaming is pumped to a double-roll double-roll pulp washer for pulp washing; S17, pulp screening: including the first pulp screening and the second pulp screening.

4. The method for producing degradable mulch paper using bamboo fibers and coffee grounds according to claim 3, characterized in that: In step S14, the weight ratio of the mixed raw material to the alkali solution is 1:3.5, wherein the water content of the mixed raw material accounts for 53%.

5. The method for producing degradable mulch paper using bamboo fibers and coffee grounds according to claim 3, characterized in that: In step S15, the specific temperature setting process is to increase the temperature from 70°C to 120°C by adding steam, which takes 60 minutes; from 120°C to 140°C, which takes 30 minutes; and from 140°C to 165°C, which takes 60 minutes.

6. The method for producing degradable mulch paper using bamboo fibers and coffee grounds according to claim 2, characterized in that: Between the batching step and the screen forming step, there is also a pulp screening step, in which a pressure screen is used to screen the pulp and separate impurities.

7. The method for producing degradable mulch paper using bamboo fibers and coffee grounds according to claim 2, characterized in that: In step S5, the pressing line pressure values ​​are: 70 kn / m for the first press, 90 kn / m for the second press, and 140 kn / m for the third press.

8. The method for producing degradable mulch paper using bamboo fibers and coffee grounds according to any one of claims 1 to 7, characterized in that: The obtained ground film paper has a basis weight of 40-80g / m 2 , paper dryness is 8%-9%, air permeability is 15-60um / Pa•s, longitudinal tensile strength is 1.2-3.2kN / m, transverse tensile strength is 0.8-2kN / m, water absorption value is 35-50g / m 2 , paper density 0.4-0.5g / m 3 .