Sugar beet seedling paper, its preparation process and application

Abstract

The application provides a beet seedling paper and a preparation process and application thereof. The preparation process of the beet seedling paper comprises the following steps: step 1, proportioning unbleached kraft softwood pulp and synthetic fiber according to 70-90%:10-30% of the mass percentage; defibrating and beating the unbleached kraft softwood pulp, and defibrating the synthetic fiber, then mixing the two to obtain mixed pulp; step 2, sequentially adding a sizing agent solution, an aluminum sulfate solution and a wet strength agent solution into the mixed pulp, mixing, performing papermaking forming to obtain a wet paper sheet; step 3, sequentially subjecting the wet paper sheet to dewatering by pressing, drying and winding to obtain the seedling paper. The beet seedling paper is prepared by using the preparation process, and the beet seedling paper is environmentally friendly and energy-saving, and has good quality and stable processing performance. The beet seedling paper tube prepared by using the seedling paper has good agronomic adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of papermaking, in particular to a sugar beet seedling paper and a preparation process and application thereof. BACKGROUND

[0002] The sugar beet seedling paper tube is a kind of paper seedling container, which is used for planting sugar beet, a raw material for sugar industry. The traditional planting method of sugar beet is direct sowing in the field, and the direct sowing of sugar beet has a low emergence rate and is difficult to protect seedlings. Due to a long planting time and a short rotation time, soil nutrients are consumed, which makes it difficult to improve the sugar content of sugar beet and intensifies the disease and insect pests. The use of the sugar beet paper tube seedling method can improve the seedling protection rate, solve the problems of seedling shortage and difficult emergence of direct sowing sugar beet, improve the land utilization rate, prolong the growth period, and improve the yield and sugar content of sugar beet.

[0003] The sugar beet seedling paper tube is processed from a specific seedling base paper, and the performance, physical indicators and production process of the base paper are designed according to the growth characteristics of sugar beet crops and the climate characteristics of the planting area. The base paper should have certain dry and wet tensile strength, and also have certain water resistance and air permeability to ensure that the paper tube is complete, breathable, water permeable, and the lateral roots of seedlings can penetrate, and also meets the requirements of mechanized transplanting.

[0004] In the existing production process of the base paper of the sugar beet seedling paper tube, secondary fibers and additives are mostly used. Due to the unstable composition of the secondary fibers, it is difficult to control the amount of additives added in the production process, so that the quality of the base paper produced is unstable, which affects the processing performance and use effect during seedling. SUMMARY

[0005] The present application aims to provide a sugar beet seedling paper with stable quality, excellent performance and environmental protection, and a preparation process and application thereof, so as to improve the existing seedling paper for producing sugar beet seedling paper tubes.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a preparation process of a sugar beet seedling paper, characterized in that it comprises the following steps:

[0008] Step 1: mixing unbleached kraft softwood pulp and synthetic fibers according to the mass percentage of 70-90%:10-30%; defibrating and beating the unbleached kraft softwood pulp, and defibrating the synthetic fibers, then mixing the two to obtain a mixed pulp;

[0009] Step 2: adding a sizing agent solution, an aluminum sulfate solution and a wet strength agent solution in sequence into the mixed pulp, then further diluting the mixed pulp to a mass concentration of 0.2-1%, and forming a wet paper sheet by papermaking;

[0010] Step 3, the wet paper is dehydrated by pressing, dried, and rolled to obtain the seedling paper.

[0011] Preferably, in the step 1, the unbleached kraft softwood pulp and the synthetic fiber are preferably formulated according to the mass percentage of 80-85%: 15-20%; and / or, the beating consistency of the unbleached kraft softwood pulp is 3.5-4.5%, the beating degree is 38-45°SR, and the wet weight is not less than 4g; further preferably, the beating consistency of the unbleached kraft softwood pulp is 4.0-4.5%, the beating degree is 40-42°SR, and the wet weight is not less than 5g.

[0012] Preferably, the synthetic fiber is selected from at least one of vinylon, acrylic, and nylon; the synthetic fiber is further preferably vinylon, the length of which is 4-6mm, the fineness of which is 0.5-2d, and the purity of which is not less than 80%.

[0013] Preferably, the sizing agent is alkyl alkene ketone dimer, the mass concentration of the sizing agent solution is 1.0-3.5%, and the amount of the sizing agent solution is 0.5-1% of the total mass of the mixed pulp.

[0014] Preferably, the mass concentration of the aluminum sulfate solution is 3-10%, and the amount of the aluminum sulfate solution is 4-5% of the total mass of the mixed pulp.

[0015] Preferably, the wet-strength agent is melamine formaldehyde resin, the mass concentration of the wet-strength agent solution is 1.0-3.0%, and the amount of the wet-strength agent solution is 2-5% of the total mass of the mixed pulp.

[0016] Preferably, the forming machine speed of the paper machine is 45-50m / min, and the net section dehydration rate is 85-95%; further preferably, a double-cylinder double-cylinder paper machine is used; further preferably, the moisture content of the seedling paper is 4-6%.

[0017] In the second aspect, the application provides the sugar beet seedling paper obtained by the method.

[0018] In the third aspect, the application provides a seedling paper tube, which is made of the sugar beet seedling paper, and preferably, the seedling paper tube has a regular hexagonal prism structure.

[0019] In the fourth aspect, the application provides the application of the seedling paper tube in sugar beet seedling.

[0020] The technical effect of the application is that:

[0021] The preparation process of the application is used to produce the beet seedling paper, which is environment-friendly and energy-saving, and the obtained seedling paper has good quality and stable processing performance. The beet seedling paper tube prepared by using the seedling paper has good agronomic adaptability. In addition, the beet seedling paper tube is used for seedling of beet, which can increase the accumulated temperature, prolong the growth period, improve the yield of beet crops, and resist diseases and pests. The beet seedling paper tube of the application can naturally degrade after seedling and transplanting, and can also play a role in loosening the soil and improving the soil. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The actual picture of the seedling paper tube prepared by the seedling paper of Example 1 of the application. DETAILED DESCRIPTION

[0023] The length of the vinylon used in the example of the application is 4-6mm, the fineness is 0.5-2d, and the purity is not less than 80%.

[0024] The sizing agent used in the example of the application is alkyl alkene ketone dimer (AKD).

[0025] The wetting strength agent used in the example of the application is melamine formaldehyde resin (MF).

[0026] The double-cylinder double-cylinder paper machine is used in the example of the application, and the model is a paper machine with a width of 1575.

[0027] In the description of the application, it should be noted that the specific conditions are not specified in the examples, and the conventional conditions or the conditions recommended by the manufacturer are used. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be purchased on the market.

[0028] The technical solutions of the application will be described clearly and completely in combination with the specific embodiments, but the following examples are only limited to part of the research of the application, and are only used to illustrate the application, and should not be regarded as limiting the scope of the application. Based on this, other examples obtained by ordinary skilled persons in the art without creative labor are within the scope of protection of the application. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be purchased on the market.

[0029] Example 1

[0030] The example provides a preparation process of beet seedling paper, which comprises the following steps:

[0031] 1. The unbleached kraft pulp and synthetic fiber are mixed according to the mass percentage of 80%:20%; the unbleached kraft pulp is defibered in a hydraulic pulper, and then is beaten in a disc refiner, and the beating degree is 42 0 SR, the wet weight is 5g, and the beating concentration is 4.0%, and the beaten pulp is put into a mixing bin.

[0032] 2. The vinylon is dispersed and defiberated in a hydraulic pulper, and then is put into a mixing bin to be mixed evenly with the unbleached kraft softwood pulp to obtain a mixed pulp.

[0033] 3. A sizing agent solution with a mass concentration of 2% is added into the mixing bin at 0.8% of the mass of the mixed pulp, and an aluminum sulfate solution with a mass concentration of 5% is added into the mixing bin at 4.5% of the mass of the mixed pulp.

[0034] 4. A wet-strength agent solution with a mass percentage of 1.8% is prepared and added into the mixing bin at 3% of the mass of the mixed pulp.

[0035] 5. Each auxiliary material is added at an interval of 10 minutes, and the prepared mixed pulp is pumped into a stock preparation box to be diluted to an approach flow concentration of about 0.4%, and then is fed into a twin-cylinder twin-cylinder paper machine through a sand trap and a headbox, is formed through a wire section, and is dried to form a paper sheet through vacuum pressing and a drying cylinder. The speed of the paper machine is 50 m / min, the wire section dewatering rate is 90%, and the drying cylinder temperature is 110°C. Then the paper sheet is wound, rewound, and cut.

[0036] The performance indexes of the sugar beet seedling raising paper prepared in this example are shown in Table 1.

[0037] Example 2

[0038] This example provides a preparation process of a sugar beet seedling raising paper, which comprises the following steps:

[0039] 1. Unbleached kraft softwood pulp and synthetic fiber are prepared according to a mass percentage of 85%:15%. The unbleached kraft softwood pulp is defiberated in a hydraulic pulper and then is beaten in a disc refiner. The beating degree is 40 0 SR, the wet weight is 6 g, and the beating consistency is 4.5%. The beaten pulp is put into a mixing bin.

[0040] 2. The vinylon is dispersed and defiberated in a hydraulic pulper, and then is put into a mixing bin to be mixed evenly with the unbleached kraft softwood pulp to obtain a mixed pulp.

[0041] 3. A sizing agent solution with a mass concentration of 2% is added into the mixing bin at 0.8% of the mass of the mixed pulp, and an aluminum sulfate solution with a mass concentration of 5% is added into the mixing bin at 4.5% of the mass of the mixed pulp.

[0042] 4. A wet-strength agent solution with a mass percentage of 1.8% is prepared and added into the mixing bin at 3% of the mass of the mixed pulp.

[0043] 5. Each auxiliary material is added at intervals of 10 minutes, the mixed pulp is pumped to the mixing box, diluted to a concentration of about 0.4% for the on-line, passed through the sand trap, the headbox into the double cylinder double-cylinder paper machine, formed through the wire section, then vacuum press, drying cylinder to form the paper. The speed is 45 m / min, the wire section dehydration rate is 92%, the drying cylinder temperature is 110°C, then winding, rewinding, slitting.

[0044] The performance indexes of the sugar beet seedling paper manufactured in this example are shown in Table 1.

[0045] Example 3

[0046] This example provides a preparation process of sugar beet seedling paper, which is only different from Example 1 in that the unbleached kraft softwood pulp and synthetic fiber are compounded according to 90%:10%. The performance indexes of the sugar beet seedling paper manufactured in this example are shown in Table 1.

[0047] Example 4

[0048] This example provides a preparation process of sugar beet seedling paper, which is only different from Example 1 in that the vinylon is replaced by vinylon and acrylic fiber, and the mass ratio of vinylon and acrylic fiber is 1:1. The performance indexes of the sugar beet seedling paper manufactured in this example are shown in Table 1.

[0049] Example 5

[0050] This example provides a preparation process of sugar beet seedling paper, which is only different from Example 1 in that the vinylon is replaced by acrylic fiber. The performance indexes of the sugar beet seedling paper manufactured in this example are shown in Table 1.

[0051] Example 6

[0052] This example provides a preparation process of sugar beet seedling paper, which is only different from Example 1 in that the synthetic fiber is nylon. The unbleached kraft softwood pulp and synthetic fiber are compounded according to 70%:30%. The performance indexes of the sugar beet seedling paper manufactured in this example are shown in Table 1.

[0053] Comparative Example 1

[0054] This comparative example provides a preparation process of sugar beet seedling paper, which is only different from Example 1 in that there is no process of adding aluminum sulfate solution. The performance indexes of the sugar beet seedling paper manufactured in this example are shown in Table 2.

[0055] Comparative Example 2

[0056] This comparative example provides a preparation process of sugar beet seedling paper, which is only different from Example 1 in that the amount of aluminum sulfate solution added is 6% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured in this example are shown in Table 2.

[0057] Comparative Example 3

[0058] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0059] Comparative example 4

[0060] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0061] Comparative example 5

[0062] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0063] Comparative example 6

[0064] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0065] Comparative example 7

[0066] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0067] Comparative example 8

[0068] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0069] Comparative example 9

[0070] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0071] Comparative example 10

[0072] The comparative example 1 provides a preparation process of sugar beet seedling paper, which is only different from the example 1 in that the adding amount of the aluminum sulfate solution is 3% of the mixed pulp. The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0073] The performance indexes of the sugar beet seedling paper manufactured by the comparative example 1 are shown in Table 2.

[0074] Table 1 Performance indexes of sugar beet seedling paper of the example

[0075]

[0076]

[0077] Table 2 Performance index of beet seedling paper of the present application comparative example

[0078]

[0079]

[0080] From the data of Table 1 and Table 2, it can be seen that the beet seedling paper of the present application example has good dry strength, wet strength, cooking strength and tightness, and can also have good water resistance and air permeability, and the performance of the beet seedling paper produced in Example 1 is the best. When no aluminum sulfate solution is added in the production process, the cooking strength and water resistance will decrease significantly (Comparative Example 1); and too much or too little aluminum sulfate will affect the performance of the seedling paper, for example, too much will make the pulp solution too acidic, aggravate the degradation of plant fibers, and also easily compact the soil, and too little will significantly reduce the strength of the paper sheet (Comparative Examples 2 and 3); the selection of sizing agent and wet strength agent will also have an important influence on the performance of the seedling paper. In addition, the synthetic fibers suitable for the present application at present are temporarily Vinyon, Acrylic and Nylon, and other synthetic fibers such as Polyester, Spandex and Chlorofiber have hydrophobic properties, which are difficult to disperse in water and difficult to mix uniformly with plant fibers, so the indexes of the paper formed are not ideal, which will adversely affect the performance of the seedling paper.

[0081] The present application also provides a seedling paper tube, which is obtained from the seedling paper of the present application example. For example, the seedling paper of Example 1 is processed into a seedling paper tube, and the structure is as shown in Figure 1 The seedling paper tube has the characteristics of energy saving, environmental protection, stable performance of raw paper, and meeting the requirements of mechanized transplanting, and is specifically used for beet planting. The normal time for direct seeding of beets is in early to middle May. If seedling paper tubes are used for seedling, the seedlings can be concentrated in the greenhouse in April and transplanted in May, so that the accumulated temperature can be increased for one month, the growth of beet seeds can be accelerated for one month, and the growth period is extended. After transplanting, the seedling paper tube naturally degrades in the field, which plays a role in loosening the soil and improving the soil.

[0082] The above-described examples only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A preparation process for a sugar beet seedling paper, characterized in that: Includes the following steps: Step 1: Mix unbleached sulfate softwood pulp and synthetic fiber at a mass percentage of 70-90%: 10-30%; break down and beat the unbleached sulfate softwood pulp and break down the synthetic fiber, then mix the two to obtain a mixed pulp; Step 2: Add sizing agent solution, aluminum sulfate solution and wet strength agent solution to the mixed pulp in sequence and mix. Then, further dilute the mixed pulp to a mass concentration of 0.2-1% and perform papermaking to obtain wet paper sheets. Step 3: The wet paper sheets are sequentially pressed, dehydrated, dried, and rolled to obtain the seedling paper; The synthetic fiber is selected from at least one of vinylon, acrylic, and nylon; The sizing agent is an alkyl ketene dimer, and the mass concentration of the sizing agent solution is 1.0~3.5%; The humidifying agent is melamine-formaldehyde resin, and the mass concentration of the humidifying agent solution is 1.0~3.0%. The aluminum sulfate solution has a mass concentration of 3-10%, and the amount of aluminum sulfate solution used is 4-5% of the total mass of the mixed slurry.

2. The preparation process according to claim 1, characterized in that: In step 1, unbleached sulfate softwood pulp and synthetic fiber are mixed in a mass percentage ratio of 80-85%:15-20%; and / or, the unbleached sulfate softwood pulp has a beating concentration of 3.5-4.5%, a freeness of 38-45°SR, and a wet weight of not less than 4g.

3. The preparation process according to claim 2, characterized in that: The unbleached sulfate softwood pulp has a beating concentration of 4.0-4.5%, a freeness of 40-42°SR, and a wet weight of not less than 5g.

4. The preparation process according to claim 1, characterized in that: The synthetic fiber is vinylon, with a length of 4-6 mm, a fineness of 0.5-2 d, and a purity of not less than 80%.

5. The preparation process according to any one of claims 1 to 4, characterized in that: The amount of the sizing agent solution used is 0.5-1% of the total mass of the mixed slurry.

6. The preparation process according to claim 1, characterized in that: The amount of the humectant solution used is 2-5% of the total mass of the mixed slurry.

7. The preparation process according to claim 1, characterized in that: The paper machine speed for forming the paper is 45-50 m / min, and the wire section dewatering rate is 85-95%.

8. The preparation process according to claim 7, characterized in that: A double-cylinder, double-circular wire paper machine is used for paper forming.

9. The preparation process according to claim 7, characterized in that: The moisture content of the seedling paper is 4-6%.

10. Beet seedling paper obtained by the preparation process according to any one of claims 1 to 9.

11. A seedling paper tube, characterized in that: It is made using the beet seedling paper described in claim 10.

12. The seedling paper tube according to claim 11, characterized in that: The seedling tube is a regular hexagonal prism structure.

13. The application of the seedling paper tube according to claim 11 or 12 in sugar beet seedling cultivation.

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