阅读说明：本技术 一种提高结合力的箱板纸及其制作工艺 (Boxboard paper capable of improving binding force and manufacturing process thereof ) 是由 占正奉 李聪定 陈学萍 宋杰 万涛 方承文 鲁仕敏 于 2019-09-02 设计创作，主要内容包括：本发明公开了一种提高结合力的箱板纸及其制作工艺,属于造纸技术领域。该箱板纸包括底层和芯层,所述芯层为长纤维层,底层为短纤维层,在芯底层复合面上,长纤维均匀排列构成骨架,短纤维嵌入骨架的间隙中。芯层以长纤维为主,底层以短纤维为主,通过控制芯层长纤维和底层短纤维的比重,在芯底层复合面上,构造出长纤维骨架嵌入短纤维,保证了复合面的结合强度。(The invention discloses boxboard paper capable of improving binding force and a manufacturing process thereof, and belongs to the technical field of papermaking. 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.)

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.

9. The manufacturing process of the cardboard paper capable of improving the binding force is characterized by comprising the following specific steps of:

s101, controlling the specific gravity of long fibers of a core layer (20) and short fibers of a bottom layer (10) to be 4: 3, controlling a water line of the core bottom layer (10), constructing a long fiber framework on a composite surface of the core bottom layer (10), and embedding short fibers into the framework;

step S102, drying part steam curve:

1# Cylinder 2# Cylinder 3-6 # cylinder 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

。

10. The process of claim 9, further comprising step S103, drying steam profile of sizing:

Technical Field

The invention belongs to the technical field of papermaking, and particularly relates to boxboard paper capable of improving binding force and a manufacturing process thereof.

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

Aiming at the problem that the production is influenced by paper breakage caused by starch accumulation and falling into the paper surface in the manufacturing process of the existing cardboard paper, the invention provides the cardboard paper with improved binding force and the manufacturing process thereof, starch does not need to be sprayed, the occurrence of paper breakage is effectively avoided, and the working efficiency is improved.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the cardboard paper capable of improving the binding force 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 the composite surface of the core layer to form a framework, and the short fibers are embedded into gaps of the framework.

In one possible embodiment of the 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 one 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 core layer further includes a surface layer, the surface layer is compounded on the core layer, and the surface layer is a short fiber layer.

In one possible embodiment of the present invention, the long fiber is formed with a filmy filament, the filmy filament has a fineness of 0.001 to 0.1D and a length of 0.005 to 0.01 mm.

In one possible embodiment of the present invention, the specific gravity of the bottom layer, the core layer and the surface layer is 3: 4: 1.

in one possible embodiment of the invention, the staple fibers of the face layer have a length of 0.05mm to 0.08 mm.

In a possible embodiment of the present invention, 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.

The invention also provides a manufacturing process of the boxboard paper for improving the binding force, which comprises the following specific steps:

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 # cylinder	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 method further includes step S103, drying steam curve of sizing:

3. advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the boxboard paper for improving the binding force, 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 binding strength of the composite surface is ensured;

(2) according to the boxboard paper capable of improving the binding force, in the drying part, the drying steam curve is optimized by utilizing the warping characteristic of long and short fibers after being dehydrated by heat, the long fibers comprise straight sections and warped sections, and the fiber membrane wires are positioned in the warped sections and spread over the whole warped sections, so that the long and short fibers are tightly wound, and the binding force between the core bottom layers is further improved;

(3) the cardboard paper for improving the binding force has a simple structure and is easy to manufacture.

Drawings

FIG. 1 is a schematic view of a cardboard paper structure for improving binding force according to the present invention;

FIG. 2 is a cross-sectional view of a boxboard of the present invention to improve binding force;

fig. 3 is a surface view of the linerboard having improved coupling force according to the present invention.

Description of reference numerals:

10. a bottom layer; 20. a core layer; 30. and (6) a surface layer.

Detailed Description

The invention is further described with reference to specific examples.