Preparation method of cardboard paper with silver fir grains

Abstract

The invention belongs to the technical field of paper manufacturing, and particularly relates to a preparation method of cardboard paper with silver fir grains. In order to solve the problem that in the prior art, the consumption of natural wood is large in the manufacturing process of cardboard paper with silver fir grains, the preparation method of the cardboard paper with the silver fir grains comprises the steps that wood and waste paper serve as raw materials, pulping and screening are conducted, then starch, liquid aluminum sulfate and a silver fir grain blending agent are added, and the mixture is conveyed to a headbox through a pulp pump; conveying to a net part of a paper machine, and dehydrating through the net part to form a wet paper web; transferring to a pressing part, pressing by a shoe pressing roller, entering a drying part, drying, and sizing, coiling and packaging to obtain the cardboard paper with silver and fir grains. The waste paper is used as the main raw material, the proportion of wood in the raw material components is reduced, and the silver fir grain blending agent is added to enable the surface of the final cardboard paper product to present silver fir grains, so that the wood consumption is reduced, and meanwhile, the requirements of high-quality and personalized packaging are met.

Description

Technical Field

[0001] The invention belongs to the technical field of paper manufacturing, and in particular relates to a method for preparing boxboard paper with silver fir wood grain. Background Art

[0002] In the packaging industry, consumers have higher and higher requirements for the appearance of product packaging. Packaging materials with unique wood grain effects can attract consumers' attention and improve the grade and added value of products. As a widely used packaging material, corrugated board paper can meet the market's demand for high-quality and personalized packaging by giving it silver fir wood grain. In the prior art, corrugated board paper with silver fir wood grain is mostly made of natural wood as the main raw material, which leads to a greater dependence on natural wood, a greater impact on the environment, and does not conform to the concept of sustainable development.

[0003] For example, a Chinese invention patent discloses a method for preparing high-strength and high-water-resistant cardboard [application number: 202110379626.8]. The invention patent includes the following steps: Step 1: Using waste paper or waste paper pulp board as raw material, pulping with a hydraulic pulper to obtain papermaking pulp; Step 2: Add a reinforcing agent and an intra-slurry water-repellent agent to the papermaking pulp obtained in step 1, and mix them evenly; Step 3: Filter water through the forming wire part of the papermaking machine, squeeze and dehydrate, and dry to obtain dry paper sheets; Step 4: Apply a surface sizing agent to the surface of the dry paper sheet obtained in step 3; Step 5: Dry, calender, and roll to obtain the finished cardboard; the reinforcing agent includes polyacrylamide; the intra-slurry water-repellent agent includes dodecenyl succinic anhydride, zinc chloride and polyamide epichlorohydrin resin; the surface sizing agent includes melamine formaldehyde resin, rosin glue and paraffin.

[0004] Although this invention patent uses waste paper or waste pulp board as raw materials and can play a role in resource recycling and reuse, the finished cardboard product produced therefrom does not have the silver fir wood grain and still cannot meet the needs of high-quality, personalized packaging. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing boxboard with silver fir wood grain in view of the above problems.

[0006] A method for preparing boxboard with silver fir wood grain, comprising the following steps:

[0007] Step 1: Use wood and waste paper as raw materials, put them into different pulpers respectively, add water and break them into small pieces or fibers through mechanical action to form wood pulp and preliminary paper pulp;

[0008] Step 2: Add the preliminary pulp obtained in step 1 to a screening device to remove impurities and incompletely broken down coarse fibers in the pulp to obtain pulp;

[0009] Step 3: adding the wood pulp prepared in step 1 and the paper pulp prepared in step 2 into a pulping device for pulping;

[0010] Step 4: The pulped slurry is transferred to a batching tank, and starch, liquid aluminum sulfate and silver fir wood grain blending agent are added, and mixed thoroughly to form a mixed slurry with specific properties and color, and then pumped to a headbox;

[0011] Step 5: transporting to the wire section of the paper machine, dehydrating through the wire section to form a wet paper web;

[0012] Step 6: The wet paper web is transferred from the wire section to the pressing section, pressed by a shoe press roller, and then enters the drying section. After drying, it is sizing, rolled up and packaged to obtain boxboard paper with silver fir wood grain.

[0013] In the above-mentioned method for preparing boxboard with Cathaya argyrophylla wood grain, the mass ratio of wood to waste paper in the raw materials in step 1 is 1:9.

[0014] In the above method for preparing boxboard with Cathaya argyrophylla wood grain, the amount of starch added in step 4 is 1%-2% of the total weight of the pulp.

[0015] In the above-mentioned method for preparing boxboard with silver fir wood grain, the amount of liquid aluminum sulfate added in step 4 is 0.1%-0.5% of the total weight of the pulp.

[0016] In the above-mentioned method for preparing boxboard with silver fir wood grain, the silver fir wood grain formulation agent in step 4 is sodium dodecyl sulfate modified nickel particles.

[0017] In the above method for preparing boxboard with silver fir wood grain, the amount of the sodium dodecyl sulfate modified nickel particles added is 0.05%-0.3% of the total weight of the pulp.

[0018] In the above-mentioned method for preparing boxboard with silver fir wood grain, the preparation method of the sodium dodecyl sulfate modified nickel particles is:

[0019] Step A: dissolving Ni(NO3)2·6H2O in deionized water to obtain a nickel salt solution, dissolving sodium dodecyl sulfate in deionized water to obtain an SDS solution, and dissolving NaBH4 in ice water to obtain a reducing agent solution;

[0020] Step B: Mix the prepared nickel salt solution and SDS solution evenly, then add the prepared reducing agent solution dropwise under nitrogen protection, ice water bath and stirring conditions, and continue stirring for 30-60 minutes until the reaction is complete;

[0021] Step C: The reaction solution is separated by a centrifuge, the supernatant is removed, and the solid matter is washed alternately with ethanol and deionized water for several times to obtain sodium dodecyl sulfate-modified nickel particles.

[0022] In the above-mentioned method for preparing boxboard with silver fir wood grain, the mass ratio of Ni(NO3)2·6H2O, sodium dodecyl sulfate and NaBH4 is 5:1:1.

[0023] In the above-mentioned method for preparing boxboard with silver fir wood grain, the molar concentration of the nickel salt solution is 0.01-0.1 mol / L.

[0024] In the above method for preparing boxboard with Cathaya argyrophylla wood grain, the moisture content of the paper after drying in step 6 is 6-10%.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] 1. The present invention uses waste paper as the main raw material, reduces the proportion of wood in the raw material components, and by adding a silver fir wood grain blending agent, the surface of the final boxboard paper product presents a silver fir wood grain, thereby reducing wood consumption while meeting the needs of high-quality, personalized packaging.

[0027] 2. The manufacturing method of the present invention is simple, and the process has little change compared to the original papermaking process, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a product photo of the boxboard with silver fir wood grain prepared in Example 1. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] Example 1

[0031] This embodiment provides a method for preparing boxboard with silver fir wood grain, comprising the following steps:

[0032] Step 1: Use wood and waste paper as raw materials, with a mass ratio of 1:9, and put them into different pulpers respectively. Add water and break them into small pieces or fibers through mechanical action to form wood pulp and preliminary paper pulp;

[0033] Step 2: Add the preliminary pulp obtained in step 1 to a screening device to remove impurities and incompletely broken down coarse fibers in the pulp to obtain pulp;

[0034] Step 3: adding the wood pulp prepared in step 1 and the paper pulp prepared in step 2 into a pulping device for pulping;

[0035] Step 4: Transfer the pulped slurry to a batching tank, add starch, liquid aluminum sulfate and silver fir wood grain blending agent, the amount of starch added is 1.5% of the total weight of the pulp, the amount of liquid aluminum sulfate added is 0.3% of the total weight of the pulp, the silver fir wood grain blending agent is sodium dodecyl sulfate modified nickel particles and the amount of sodium dodecyl sulfate modified nickel particles added is 0.2% of the total weight of the pulp, fully mix to form a mixed slurry with specific properties and color, and then pump it to the headbox;

[0036] Step 5: transporting to the wire section of the paper machine, dehydrating through the wire section to form a wet paper web;

[0037] Step six: transfer the wet paper web from the wire section to the pressing section, press it through the shoe press roller, and then enter the drying section. After drying, gluing, winding and packaging are performed. After drying, the moisture content of the paper is 8%, and boxboard with silver fir wood grain is obtained.

[0038] The preparation method of sodium dodecyl sulfate modified nickel particles is as follows:

[0039] Step A: dissolving Ni(NO3)2·6H2O in deionized water to obtain a nickel salt solution, wherein the molar concentration of the nickel salt solution is 0.05 mol / L; dissolving sodium dodecyl sulfate in deionized water to obtain an SDS solution; dissolving NaBH4 in ice water to obtain a reducing agent solution, wherein the mass ratio of Ni(NO3)2·6H2O, sodium dodecyl sulfate and NaBH4 is 5:1:1;

[0040] Step B: The prepared nickel salt solution and SDS solution were mixed evenly, and then the prepared reducing agent solution was added dropwise under nitrogen protection, ice water bath and stirring conditions, and the stirring was continued for 45 minutes until the reaction was complete;

[0041] Step C: The reaction solution is separated by a centrifuge, the supernatant is removed, and the solid matter is washed alternately with ethanol and deionized water for several times to obtain sodium dodecyl sulfate-modified nickel particles.

[0042] The boxboard product with silver fir wood grain prepared in this embodiment is as follows Figure 1 shown.

[0043] Example 2

[0044] This embodiment provides a method for preparing boxboard with silver fir wood grain, comprising the following steps:

[0045] Step 1: Use wood and waste paper as raw materials, with a mass ratio of 1:9, and put them into different pulpers respectively. Add water and break them into small pieces or fibers through mechanical action to form wood pulp and preliminary paper pulp;

[0046] Step 2: Add the preliminary pulp obtained in step 1 to a screening device to remove impurities and incompletely broken down coarse fibers in the pulp to obtain pulp;

[0047] Step 3: adding the wood pulp prepared in step 1 and the paper pulp prepared in step 2 into a pulping device for pulping;

[0048] Step 4: Transfer the pulped slurry to a batching tank, add starch, liquid aluminum sulfate and silver fir wood grain blending agent, the amount of starch added is 1% of the total weight of the pulp, the amount of liquid aluminum sulfate added is 0.5% of the total weight of the pulp, the silver fir wood grain blending agent is sodium dodecyl sulfate modified nickel particles and the amount of sodium dodecyl sulfate modified nickel particles added is 0.3% of the total weight of the pulp, fully mix to form a mixed slurry with specific properties and color, and then pump it to the headbox;

[0049] Step 5: transporting to the wire section of the paper machine, dehydrating through the wire section to form a wet paper web;

[0050] Step six: transfer the wet paper web from the wire section to the pressing section, press it through the shoe press roller, and then enter the drying section. After drying, apply glue, roll up and package. After drying, the moisture content of the paper is 10%, and boxboard with silver fir wood grain is obtained.

[0051] The preparation method of sodium dodecyl sulfate modified nickel particles is as follows:

[0052] Step A: dissolving Ni(NO3)2·6H2O in deionized water to obtain a nickel salt solution, wherein the molar concentration of the nickel salt solution is 0.1 mol / L; dissolving sodium dodecyl sulfate in deionized water to obtain an SDS solution; dissolving NaBH4 in ice water to obtain a reducing agent solution, wherein the mass ratio of Ni(NO3)2·6H2O, sodium dodecyl sulfate and NaBH4 is 5:1:1;

[0053] Step B: The prepared nickel salt solution and SDS solution were mixed evenly, and then the prepared reducing agent solution was added dropwise under nitrogen protection, ice water bath and stirring conditions, and the stirring was continued for 60 minutes until the reaction was complete;

[0054] Step C: The reaction solution is separated by a centrifuge, the supernatant is removed, and the solid matter is washed alternately with ethanol and deionized water for several times to obtain sodium dodecyl sulfate-modified nickel particles.

[0055] Example 3

[0056] This embodiment provides a method for preparing boxboard with silver fir wood grain, comprising the following steps:

[0057] Step 1: Use wood and waste paper as raw materials, with a mass ratio of 1:9, and put them into different pulpers respectively. Add water and break them into small pieces or fibers through mechanical action to form wood pulp and preliminary paper pulp;

[0058] Step 2: Add the preliminary pulp obtained in step 1 to a screening device to remove impurities and incompletely broken down coarse fibers in the pulp to obtain pulp;

[0059] Step 3: adding the wood pulp prepared in step 1 and the paper pulp prepared in step 2 into a pulping device for pulping;

[0060] Step 4: Transfer the pulped slurry to a batching tank, add starch, liquid aluminum sulfate and silver fir wood grain blending agent, the amount of starch added is 2% of the total weight of the pulp, the amount of liquid aluminum sulfate added is 0.1% of the total weight of the pulp, the silver fir wood grain blending agent is sodium dodecyl sulfate modified nickel particles and the amount of sodium dodecyl sulfate modified nickel particles added is 0.05% of the total weight of the pulp, fully mix to form a mixed slurry with specific properties and color, and then send it to the headbox through a slurry pump;

[0061] Step 5: transporting to the wire section of the paper machine, dehydrating through the wire section to form a wet paper web;

[0062] Step 6: The wet paper web is transferred from the wire section to the pressing section, pressed by a shoe press roller, and then enters the drying section. After drying, the paper is sizing, rolled up and packaged. After drying, the moisture content of the paper is 6%, and boxboard with silver fir wood grain is obtained.

[0063] The preparation method of sodium dodecyl sulfate modified nickel particles is as follows:

[0064] Step A: dissolving Ni(NO3)2·6H2O in deionized water to obtain a nickel salt solution, wherein the molar concentration of the nickel salt solution is 0.01 mol / L; dissolving sodium dodecyl sulfate in deionized water to obtain an SDS solution; dissolving NaBH4 in ice water to obtain a reducing agent solution, wherein the mass ratio of Ni(NO3)2·6H2O, sodium dodecyl sulfate and NaBH4 is 5:1:1;

[0065] Step B: The prepared nickel salt solution and SDS solution were mixed evenly, and then the prepared reducing agent solution was added dropwise under nitrogen protection, ice water bath and stirring conditions, and the stirring was continued for 30 minutes until the reaction was complete;

[0066] Step C: The reaction solution is separated by a centrifuge, the supernatant is removed, and the solid matter is washed alternately with ethanol and deionized water for several times to obtain sodium dodecyl sulfate-modified nickel particles.

[0067] Example 4

[0068] This embodiment provides a method for preparing boxboard with silver fir wood grain, comprising the following steps:

[0069] Step 1: Use wood and waste paper as raw materials, with a mass ratio of 1:9, and put them into different pulpers respectively. Add water and break them into small pieces or fibers through mechanical action to form wood pulp and preliminary paper pulp;

[0070] Step 2: Add the preliminary pulp obtained in step 1 to a screening device to remove impurities and incompletely broken down coarse fibers in the pulp to obtain pulp;

[0071] Step 3: adding the wood pulp prepared in step 1 and the paper pulp prepared in step 2 into a pulping device for pulping;

[0072] Step 4: Transfer the pulped slurry to a batching tank, add starch, liquid aluminum sulfate and silver fir wood grain blending agent, the amount of starch added is 1.8% of the total weight of the pulp, the amount of liquid aluminum sulfate added is 0.4% of the total weight of the pulp, the silver fir wood grain blending agent is sodium dodecyl sulfate modified nickel particles and the amount of sodium dodecyl sulfate modified nickel particles added is 0.1% of the total weight of the pulp, fully mix to form a mixed slurry with specific properties and color, and then send it to the headbox through a slurry pump;

[0073] Step 5: transporting to the wire section of the paper machine, dehydrating through the wire section to form a wet paper web;

[0074] Step 6: The wet paper web is transferred from the wire section to the pressing section, pressed by a shoe press roller, and then enters the drying section. After drying, the paper is sizing, rolled up and packaged. After drying, the moisture content of the paper is 9%, and boxboard with silver fir wood grain is obtained.

[0075] The preparation method of sodium dodecyl sulfate modified nickel particles is as follows:

[0076] Step A: dissolving Ni(NO3)2·6H2O in deionized water to obtain a nickel salt solution, wherein the molar concentration of the nickel salt solution is 0.08 mol / L; dissolving sodium dodecyl sulfate in deionized water to obtain an SDS solution; dissolving NaBH4 in ice water to obtain a reducing agent solution, wherein the mass ratio of Ni(NO3)2·6H2O, sodium dodecyl sulfate and NaBH4 is 5:1:1;

[0077] Step B: The prepared nickel salt solution and SDS solution were mixed evenly, and then the prepared reducing agent solution was added dropwise under nitrogen protection, ice water bath and stirring conditions, and the stirring was continued for 50 minutes until the reaction was complete;

[0078] Step C: The reaction solution is separated by a centrifuge, the supernatant is removed, and the solid matter is washed alternately with ethanol and deionized water for several times to obtain sodium dodecyl sulfate-modified nickel particles.

[0079] Application Example 1

[0080] The performance indicators of the boxboard paper product with silver fir wood grain prepared in Example 1 and the existing commercially available boxboard paper products were tested respectively, and the test results are shown in the following table:

[0081]

[0082] Result analysis: From the test results, it can be seen that the performance indicators of the silver fir wood grain boxboard and the ordinary boxboard are basically the same. Therefore, the present invention does not reduce its basic performance as a packaging material while giving the boxboard the silver fir wood grain, so the intended purpose of the present invention is achieved.

[0083] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A method for preparing boxboard with silver fir wood grain, characterized in that: The following steps are involved: Step 1: Use wood and waste paper as raw materials, put them into different pulpers respectively, add water and break them into small pieces or fibers through mechanical action to form wood pulp and preliminary paper pulp; Step 2: Add the preliminary pulp obtained in step 1 to a screening device to remove impurities and incompletely broken down coarse fibers in the pulp to obtain pulp; Step 3: adding the wood pulp prepared in step 1 and the paper pulp prepared in step 2 into a pulping device for pulping; Step 4: The pulped slurry is transferred to a batching tank, and starch, liquid aluminum sulfate and silver fir wood grain blending agent are added, and mixed thoroughly to form a mixed slurry with specific properties and color, and then pumped to a headbox; Step 5: transporting to the wire section of the paper machine, dehydrating through the wire section to form a wet paper web; Step 6: The wet paper web is transferred from the wire section to the pressing section, pressed by a shoe press roller, and then enters the drying section. After drying, it is sizing, rolled up and packaged to obtain boxboard paper with silver fir wood grain.

2. A method for preparing boxboard with silver fir wood grain according to claim 1, characterized in that: In the step 1, the mass ratio of wood to waste paper in the raw materials is 1:

9.

3. The method for preparing boxboard with silver fir wood grain according to claim 1, characterized in that: The amount of starch added in step 4 is 1%-2% of the total weight of the pulp.

4. The method for preparing boxboard with Cathaya argyrophylla wood grain according to claim 1, characterized in that: In the step 4, the amount of liquid aluminum sulfate added is 0.1%-0.5% of the total weight of the pulp.

5. The method for preparing boxboard with silver fir wood grain according to claim 1, characterized in that: In the step 4, the silver fir wood grain formulation agent is sodium dodecyl sulfate modified nickel particles.

6. A method for preparing boxboard with Cathaya argyrophylla wood grain as claimed in claim 5, characterized in that: The amount of the sodium dodecyl sulfate modified nickel particles added is 0.05%-0.3% of the total weight of the pulp.

7. The method for preparing boxboard with Cathaya argyrophylla wood grain according to claim 5, characterized in that: The preparation method of the sodium dodecyl sulfate modified nickel particles is: Step A: dissolving Ni(NO3)2·6H2O in deionized water to obtain a nickel salt solution, dissolving sodium dodecyl sulfate in deionized water to obtain an SDS solution, and dissolving NaBH4 in ice water to obtain a reducing agent solution; Step B: Mix the prepared nickel salt solution and SDS solution evenly, then add the prepared reducing agent solution dropwise under nitrogen protection, ice water bath and stirring conditions, and continue stirring for 30-60 minutes until the reaction is complete; Step C: The reaction solution is separated by a centrifuge, the supernatant is removed, and the solid matter is washed alternately with ethanol and deionized water for several times to obtain sodium dodecyl sulfate-modified nickel particles.

8. The method for preparing boxboard with Cathaya argyrophylla wood grain according to claim 7, characterized in that: The mass ratio of Ni(NO3)2·6H2O, sodium dodecyl sulfate and NaBH4 is 5:1:

1.

9. The method for preparing boxboard with silver fir wood grain according to claim 7, characterized in that: The molar concentration of the nickel salt solution is 0.01-0.1 mol / L.

10. The method for preparing boxboard with Cathaya argyrophylla wood grain according to claim 1, characterized in that: The moisture content of the paper after drying in step six is ​​6-10%.

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