CN211340215U - Cardboard paper capable of improving binding force - Google Patents
Cardboard paper capable of improving binding force Download PDFInfo
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- CN211340215U CN211340215U CN201921450798.4U CN201921450798U CN211340215U CN 211340215 U CN211340215 U CN 211340215U CN 201921450798 U CN201921450798 U CN 201921450798U CN 211340215 U CN211340215 U CN 211340215U
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Abstract
The utility model discloses an improve boxboard of cohesion belongs to papermaking technical field. The cardboard paper comprises a bottom layer and a core layer, wherein the core layer is a long fiber layer, the bottom layer is a short fiber layer, long fibers are uniformly arranged on a composite surface of the core layer to form a framework, and short fibers are embedded into gaps of the framework. The core layer is mainly made of long fibers, the bottom layer is mainly made of short fibers, and the long fiber framework embedded short fibers are constructed on the composite surface of the core layer and the bottom layer by controlling the specific gravity of the long fibers of the core layer and the short fibers of the bottom layer, so that the bonding strength of the composite surface is ensured.
Description
Technical Field
The utility model belongs to the technical field of the papermaking, more specifically say, relate to a boxboard of improvement cohesion.
Background
The cardboard paper is also called cardboard paper and craft paper, and is one of the main paper types of paper used for the cardboard box. The cardboard paper is produced by compounding a bottom layer, a core layer and a surface layer. The current cardboard paper raw materials mostly adopt recycled waste cardboard paper, and due to the degradation of waste cardboard paper raw material fibers, the fiber strength index is low, the bonding force between paper layers is low, the phenomenon of paper layering is easily caused, and the finished paper cannot be used.
The commonly used process for improving the binding force between the cardboard paper layers at present is mainly to add spray starch before the bottom layer pulp of the core of the net-folding paper machine is compounded, and the binding force between the cardboard paper layers is improved by utilizing the strength of the starch. For example, chinese patent application No. 201120271038.4, published as 2012 and 3/7 discloses kraft liner board paper for improving interlayer bonding force, which comprises a bottom layer, a core layer, and a surface layer, wherein a spray starch layer is disposed between the bottom layer and the core layer or between the surface layer and the core layer. Because the bottom layer, the core layer and the surface layer which are respectively produced by the net processing are compounded together, the binding force between the layers is weaker, and the spraying starch is sprayed between the bottom layer and the core layer or between the surface layer and the core layer, so that the binding force between the bottom layer and the core layer or between the surface layer and the core layer can be effectively improved.
For another example, a method for producing cardboard paper with high internal binding force is disclosed in chinese patent application No. 201510042723.2, published as 2015, 5-month and 13-day patent application, which comprises the following steps: preparing materials; adding water and disintegrating to obtain slurry; the slurry is combined, screened and purified; pulping at medium concentration; mixing the treated pulp meeting the operating conditions, flowing the mixed pulp to a short circulating system for dilution and deslagging; degassing the slurry; adding a chemical combination agent to the slurry; coating double-layer pulp on paper and filtering water to make double-layer wet paper web; carrying out three-stage squeezing dehydration on the manufactured double-layer wet paper web; pre-drying the dehydrated wet paper; coating starch surface sizing agents on two sides of the paper subjected to pre-drying; and (3) carrying out postdrying on the paper coated with the starch surface sizing agent.
Through analyzing the structure of the patent, the inventor finds that paper breaking is easily caused by the fact that the accumulated materials on the wall of the spraying starch pipe fall onto the paper surface. Although spraying starch can improve the binding force between paper layers of the cardboard, paper breaking is easily caused, and the running rate of the paper machine is reduced.
Disclosure of Invention
1. Problems to be solved
To current cardboard paper because of starch long-pending material in the manufacturing process, fall into the paper and lead to disconnected paper, influence the problem of production, the utility model provides a cardboard paper and the preparation technology of improvement cohesion need not spraying starch, effectively avoids the emergence of disconnected paper phenomenon, has improved work efficiency.
2. Technical scheme
In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:
the utility model discloses an improve boxboard of cohesion, including bottom and sandwich layer, the sandwich layer is the long fiber layer, and the bottom is the short fiber layer, and on core bottom composite surface, long fiber align to grid constitutes the skeleton, in the clearance of short fiber embedding skeleton.
In a possible embodiment of the present invention, the long fibers have a length of 0.12mm to 0.15mm, and the short fibers have a length of 0.05mm to 0.08 mm.
In a possible embodiment of the present invention, the specific gravity of the long fibers and the short fibers is 4: 3.
in a possible embodiment of the present invention, the fiber-reinforced plastic core further comprises a surface layer, wherein the surface layer is compounded on the core layer, and the surface layer is a short fiber layer.
In the utility model relates to a possible embodiment, be formed with the fibre membrane silk on the long fiber, the fineness of fibre membrane silk is 0.001 ~ 0.1D, and length is 0.005 ~ 0.01 mm.
In the present invention, in a possible embodiment, the specific gravity of the bottom layer, the core layer and the surface layer is 3: 4: 1.
in one possible embodiment of the present invention, the length of the short fibers of the surface layer is 0.05mm to 0.08 mm.
In a possible embodiment of the present invention, the long fiber includes a straight section and a warped section, wherein the fiber membrane is located in the warped section and extends over the entire warped section.
The utility model also provides a manufacturing technology of cardboard paper of cohesion improves, including following specific step:
step S101, controlling the specific gravity of the core layer long fibers and the bottom layer short fibers to be 4: 3, controlling a core bottom waterline to ensure that the composite wet paper web has a proper amount of water, constructing a long fiber framework on a core bottom composite surface, and embedding short fibers into the framework;
wet paper web waterline: the wet web contains water, and the surface of the wet web is specularly reflected. After the wet paper web is dewatered, the surface reflection is converted into diffuse reflection, and the composite moisture is controlled by controlling the specular reflection to the point of the diffuse reflection.
Step S102, drying part steam curve:
| 1# Cylinder | 2# Cylinder | 3-6 |
7, 10, 12 cylinders | 13 to 29 cylinders | 30-45 cylinder |
| Intake pressure KPa | Intake pressure KPa | Intake pressure KPa | Intake pressure KPa | Intake pressure KPa | Intake pressure KPa |
| 75 | 80 | 119 | 153 | 390 | 460 |
| 75 | 80 | 127 | 160 | 395 | 475 |
And meanwhile, in the drying part, the drying steam curve is optimized by utilizing the warping characteristic of the long and short fibers after being dehydrated by heat, so that the long and short fibers are tightly wound, and the bonding force between the layers of the core bottom layer is further improved.
In a possible embodiment of the present invention, the drying steam curve of step S103 and glue applying is further included:
3. advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the cardboard paper for improving the binding force of the utility model has the advantages that the core layer is mainly made of long fibers, the bottom layer is mainly made of short fibers, and the long fiber framework embedded short fibers are constructed on the composite surface of the core layer by controlling the specific gravity of the long fibers of the core layer and the short fibers of the bottom layer, so that the binding strength of the composite surface is ensured;
(2) the carton board paper for improving the binding force of the utility model optimizes the drying steam curve by utilizing the warping characteristic of long and short fibers after being dehydrated by heat in the drying part, and the long fibers comprise straight sections and warping sections, wherein the fiber membrane wires are positioned in the warping sections and spread over the whole warping sections, so that the long and short fibers are tightly wound, and the binding force between layers of the core bottom is further improved;
(3) the utility model discloses an improve cardboard paper of cohesion, simple structure easily makes.
Drawings
FIG. 1 is a schematic view of the cardboard paper structure for improving binding force of the present invention;
FIG. 2 is a cross-sectional view of the cardboard paper with improved binding force of the present invention;
fig. 3 is a surface view of the cardboard paper for improving the binding force of the present invention.
Description of reference numerals:
10. a bottom layer; 20. a core layer; 30. and (6) a surface layer.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Example 1
As shown in fig. 1 to 3, the binding force improving cardboard of the present embodiment includes a bottom layer 10, a core layer 20, and a surface layer 30. For example, 250g cardboard, wherein the surface layer 40g, the core layer 120g and the bottom layer 90g are provided, that is, the specific gravity of the bottom layer 10, the core layer 20 and the surface layer 30 is 3: 4: 1.
as shown in fig. 1 and 2, the core layer 20 is a long fiber layer, the bottom layer 10 is a short fiber layer, the long fibers are uniformly arranged on the composite surface of the core bottom layer 10 to form a skeleton, the short fibers are embedded in the gaps of the skeleton, the length of the long fibers is 0.12mm to 0.15mm, the length of the short fibers is 0.05mm to 0.08mm, the specific gravity of the long fibers and the short fibers is 4: 3, classifying the long and short fibers by a classifying screen in a pulping workshop, and calculating the pulp amount of the classified fibers by using a flowmeter and a densimeter to adjust the pumping frequency; the surface layer 30 is compounded on the core layer 20, the surface layer 30 is also a short fiber layer, and the length of the short fiber of the surface layer 30 is 0.05mm-0.08 mm.
Wherein, in FIG. 2, the bottom layer 10 is 75-135 g/m2The fiber layer of (a); the core layer 20 is 75-135 g/m2The fiber layer of (a); the surface layer 30 is 15-25 g/m2The fibrous layer of (2). The long fiber is formed with a fiber membrane yarn, the fineness of the fiber membrane yarn is 0.001-0.1D, and the length of the fiber membrane yarn is 0.005-0.01 mm. Analysis shows that the quantitative amount of the cardboard paper core layer 20 and the bottom layer 10 is high, the bonding strength between the two layers is the strength generated by hydrogen bonding between fibers, and the more contact points of the fibers, the more hydrogen bonds are generated, and the bonding strength is higher. Therefore, a plurality of fiber membrane yarns are formed in the length direction of the long fiber, so that the contact area is increased, and the binding force can be improved.
Further, in fig. 2, the long fiber includes a straight section and a bent section, wherein the fiber membrane filaments are located in the bent section and extend over the whole bent section. Through the drying process, the shape of the long fiber is changed, so that the long fiber and the short fiber are mutually wound, and the binding force is improved.
The embodiment provides a manufacturing process of cardboard paper for improving the binding force, which comprises the following specific steps:
(1) the waste paper is pulped in a pulper at the temperature of 50 +/-5 ℃, and finally pulped into 3-4% of pulp under the action of a rotor rotating at a high speed and water force of the pulper;
(2) separating coarse heavy impurities such as fibers, iron nails and glass slag by the centrifugal force of the high-concentration slag remover, wherein the separated heavy impurities pass through a tail slurry pipe discharge system of the high-concentration slag remover, and the purified slurry enters the next process through a good slurry pipe of the high-concentration slag remover;
(3) sizing agent is separated into three sizing agents with different fiber lengths, namely short fiber, medium fiber and long fiber through a two-stage grading sieve;
(4) concentrating the sorted slurry from 0.8-1.0% concentration to 8-12% concentration by vacuum suction of a multi-disc concentrator;
(5) heating the concentrated slurry at 100 +/-5 ℃ by a heat dispersion machine and dispersing the slurry in a gap of 0.2mm by grinding the slurry by the heat dispersion machine to dissolve fine adhesive substances in the slurry and improve the quality of the slurry;
(6) pulping the thermally dispersed pulp by a disc mill, swelling and devillicating the fibers to improve the bonding strength of the fibers in the pulp, feeding the pulped pulp to a paper machine for papermaking, and controlling the specific gravity of the long fibers of the core layer and the short fibers of the bottom layer to be 4: 3;
(7) the pulp is conveyed by a flow conveying system and formed on a net, and comprises a bottom layer wet paper sheet, a core layer wet paper sheet and a surface layer wet paper sheet, and the pulp is squeezed by a squeezing part; controlling a core bottom waterline to ensure that the composite wet paper web has a proper amount of water, constructing a long fiber framework on a core bottom composite surface, and embedding short fibers into the framework;
wet paper web waterline: the wet paper web contains water, and the surface of the wet paper web is subjected to mirror reflection; after the wet paper web is continuously dewatered, the surface reflection is converted into diffuse reflection; controlling the composite moisture by controlling the point of specular reflection to diffuse reflection;
(8) carrying out steam drying, film transfer sizing and steam drying again on 3 groups of drying cylinders (46-49 cylinders, 50-58 cylinders and 51-59 # cylinders) on the squeezed paper pulp through 6 groups of drying cylinders (1# cylinder, 2# cylinder, 3-6 # cylinder, 7, 10, 12 cylinders, 13-29 cylinders and 30-45 cylinders);
drying section steam profile:
| 1# Cylinder | 2# Cylinder | 3-6 |
7, 10, 12 cylinders | 13 to 29 cylinders | 30-45 cylinder |
| Intake pressure KPa | Intake pressure KPa | Intake pressure KPa | Intake pressure KPa | Intake pressure KPa | Intake pressure KPa |
| 75 | 80 | 119 | 153 | 390 | 460 |
| 75 | 80 | 127 | 160 | 395 | 475 |
；
Drying steam curve of sizing:
| 46-49 cylinder | 50-58 # cylinder | 51-59 # cylinder |
| Intake pressure KPa | Intake pressure KPa | Intake pressure KPa |
| 86 | 467 | 475 |
| 102 | 474 | 483 |
；
Meanwhile, in the drying part, the drying steam curve is optimized by utilizing the warping characteristic of the long and short fibers after being dehydrated by heat, so that the long and short fibers are tightly wound, and the bonding force between the layers of the core bottom layer is further improved;
(9) and (3) carrying out calendering treatment by loading line pressure of 45KN/m on the dried paper pulp at 120 ℃ by using a two-stage calender, so as to improve the smoothness of finished paper, and forming the boxboard after calendering.
Practical production has shown that if the pulp concentration is too high, the water content in the pulp is low, and the bonding between fibres through hydrogen bonds is reduced during the pressing and drying sections, which easily leads to delamination of the paper. If the difference of the dewatering degree of each layer of slurry in the net part is too large, the dryness of the slurry in the net part is inconsistent, and the binding force is worsened when each layer of wet paper is compounded, the dewatering consistency of each layer of slurry is ensured in the embodiment, and the binding force between layers can be effectively improved.
In addition, if the beating degree of each layer of pulp is relatively large, the moisture inconsistency of the pulp layer, namely dehydration inconsistency, is influenced, and under the condition that the fiber proportion of each layer of pulp is different, the beating degree of each layer of pulp is small in difference, so that the interlayer binding force is further effectively improved.
Cardboard paper performance test
The boxboard prepared in example 1 was subjected to a series of performance tests in which:
1) and (3) testing conditions are as follows: temperature 23 + -1 deg.C, relative humidity RH (50 + -2)%;
2) the checking method comprises the following steps: the method is executed according to the related national GB/T standard, and the moisture test is executed by adopting a GB/T drying method;
3) a paper bursting disk was used at 160 g (160 g was not included) or less.
TABLE 1 cardboard paper internal control technical Standard
Table 2 cardboard paper performance test in example 1
Compared with the internal control technical standard of the cardboard paper in the table 1, the data in the table 2 shows that the cardboard paper obtained in the example 1 can reach the use standard of the cardboard paper, and the product is qualified.
Claims (8)
1. The cardboard paper capable of improving the bonding force comprises a bottom layer (10) and a core layer (20), and is characterized in that the core layer (20) is a long fiber layer, the bottom layer (10) is a short fiber layer, long fibers are uniformly arranged on the composite surface of the core bottom layer (10) to form a framework, and short fibers are embedded in gaps of the framework.
2. The improved bonding boxboard according to claim 1, wherein the long fibers have a length of 0.12mm to 0.15mm and the short fibers have a length of 0.05mm to 0.08 mm.
3. The boxboard for improving bonding force according to claim 1, wherein the specific gravity of the long fiber and the short fiber is 4: 3.
4. the improved bonding boxboard according to claim 1, further comprising a face layer (30), wherein the face layer (30) is laminated on the core layer (20), and the face layer (30) is a short fiber layer.
5. The boxboard for improving binding force according to any one of claims 1 to 4, wherein the long fibers have formed thereon filmy filaments having a fineness of 0.001 to 0.1D and a length of 0.005 to 0.01 mm.
6. The boxboard for improving binding force according to claim 5, wherein the specific gravity of the bottom layer (10), the core layer (20) and the surface layer (30) is 3: 4: 1.
7. the improved bonding boxboard according to claim 6, characterized in that the length of the short fibers of the facing layer (30) is 0.05mm-0.08 mm.
8. The bond enhancing boxboard according to claim 5, wherein the long fibers comprise a straight segment and a warped segment, and wherein the filmic filaments are located in the warped segment and extend throughout the warped segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450798.4U CN211340215U (en) | 2019-09-02 | 2019-09-02 | Cardboard paper capable of improving binding force |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450798.4U CN211340215U (en) | 2019-09-02 | 2019-09-02 | Cardboard paper capable of improving binding force |
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| Publication Number | Publication Date |
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| CN211340215U true CN211340215U (en) | 2020-08-25 |
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| CN201921450798.4U Active CN211340215U (en) | 2019-09-02 | 2019-09-02 | Cardboard paper capable of improving binding force |
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