CN111472198B

CN111472198B - Method for manufacturing straw base paper, straw base paper and paper straw

Info

Publication number: CN111472198B
Application number: CN201910064373.8A
Authority: CN
Inventors: 刘仙阳; 李娟�; 周晶; 蔡文亮
Original assignee: GOLD HUASHENG PAPER (SUZHOU INDUSTRIAL PARK) CO LTD
Current assignee: Gold East Paper Jiangsu Co Ltd
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2022-06-07
Anticipated expiration: 2039-01-23
Also published as: CN111472198A

Abstract

The application discloses a manufacturing method of straw base paper, straw base paper and a paper straw, wherein the manufacturing method comprises the following steps: providing first paper pulp, wherein the first paper pulp comprises the following components in percentage by mass: 60-75% of short fiber pulp and 25-40% of long fiber pulp; respectively performing pulp dispersing on the short fiber pulp and the long fiber pulp, and mixing the short fiber pulp and the long fiber pulp after pulp dispersing to obtain second paper pulp; continuously adding a wet strength additive solution to the second pulp for a first predetermined time; continuously adding a wet strength additive solution to the second pulp at a second predetermined time; manufacturing mixed paper pulp, and continuously adding wet strength additive solution into the second paper pulp during paper manufacturing to prepare third paper pulp; and adding filler and an internal sizing agent into the third paper pulp, screening and dewatering, drying, surface sizing, drying and calendaring to obtain the straw base paper. Through the mode, the straw base paper with higher wet strength, higher stiffness and higher bursting strength can be obtained by the straw base paper.

Description

Method for manufacturing straw base paper, straw base paper and paper straw

Technical Field

The application relates to the technical field of papermaking, in particular to a manufacturing method of straw base paper, straw base paper and a paper straw.

Background

At present, a straw used for beverage is mainly made of plastic materials, is difficult to degrade after being discarded, is basically sent to a refuse landfill for treatment, and causes certain pollution to the environment. In 2018, 3 months, UK and other developed countries go out of the plastic restriction order, so that the pollution caused by the plastic is reduced. Subsequently, other developing or developed countries, such as india, south africa, thailand and costa rica, have taken similar measures to limit the use of plastic straws, advocating the importance of paper straws. The selection of environmentally friendly packaging by customers will place greater demands on paper straws.

In the long-term research and development process, the inventor finds that the conventional paper suction pipe is usually formed by compounding base paper and surface paper, the basis weight of the surface paper is low, the surface is smooth and fine, and the paper suction pipe can be used for printing complicated patterns by food-grade ink; the base paper has higher glue absorption capacity and provides certain stiffness and wet strength for the paper straw. The paper straw base paper lacks unified technical standard at present, and medium and low-grade products are frequently replaced by paper bag paper, kraft paper or cup paper.

Disclosure of Invention

The technical problem that this application mainly solved provides a preparation method, straw base paper and paper straw of straw base paper, can make the straw base paper obtain higher wet strength, higher deflection and bursting strength.

In order to solve the technical problem, the application adopts a technical scheme that: the manufacturing method of the base paper for the suction pipe comprises the following steps: providing first paper pulp, wherein the first paper pulp comprises the following components in percentage by mass: 60-75% of short fiber pulp and 25-40% of long fiber pulp; respectively carrying out pulp dispersing on the short fiber pulp and the long fiber pulp, and mixing the short fiber pulp and the long fiber pulp after pulp dispersing to obtain second paper pulp; continuously adding a wet strength additive solution into the second paper pulp at a first preset time, wherein the addition amount is 1-2 kg/ton of paper; continuously adding a wet strength additive solution into the second paper pulp at a second preset time, wherein the addition amount of the wet strength additive solution is 3-5 kg/ton of paper; manufacturing mixed paper pulp, and continuously adding wet strength additive solution into the second paper pulp during paper manufacturing, wherein the addition amount of the wet strength additive solution is 5-15 kg/ton of paper, so as to prepare third paper pulp; and adding filler and an internal sizing agent into the third paper pulp, screening and dewatering, drying, surface sizing, drying and calendaring to obtain the straw base paper.

Wherein the step of adding filler and internal sizing agent to the third pulp comprises: the third paper pulp enters a high-level box, and the concentration of the third paper pulp is diluted to 1.0-1.5% by mass; adding filler to the diluted third pulp at the inlet of the first fan pump; adding an internal sizing agent into the diluted third paper pulp at the outlet of the second fan pump to prepare fourth paper pulp; wherein the filler is precipitated calcium carbonate, the addition amount of the precipitated calcium carbonate is 50-150 kg/ton of paper, the internal sizing agent is alkenyl succinic anhydride, and the addition amount of the alkenyl succinic anhydride is 1-2.5 kg/ton of paper.

Wherein the step of surface sizing comprises: surface sizing is carried out on the paper after the upper wire is dewatered and dried; wherein, the sizing agent for surface sizing comprises the following components in percentage by mass: 60-80% of alkyl ketene dimer, 20-40% of styrene-acrylic acid polymer and 5-15 kg of sizing agent for surface sizing per ton of paper.

The method comprises the following steps of: respectively diluting the long fiber pulp and the short fiber pulp to obtain diluted long fiber pulp with the mass concentration of 4.0-4.5% and diluted short fiber pulp with the mass concentration of 4.0-4.5%; grinding the diluted long fiber pulp by a disc mill until the freeness is 400-; the diluted short fiber pulp is grinded into 380ml with conical grinding until the freeness is 320-.

Wherein the fiber length of the short fiber pulp is 0.7-0.9mm, and the short fiber pulp is hardwood bleached chemical pulp; the long fiber pulp has a fiber length of 2.0-2.6mm, and is needle-leaved wood bleaching sulfur chemical pulp.

Wherein, prior to the step of providing the first pulp, the method of making comprises: in a third preset time, stopping the machine and carrying out alkali washing, acid washing and water washing on a pretreatment line, a white water line, a paper loss line and a medicine line of the paper machine; manufacturing non-fluorescent paper; sampling the non-fluorescent paper at intervals of 2 hours at a fourth preset time, and carrying out a fluorescent reaction test; and when the number of the fluorescent filaments/fluorescent dots of the sample without the fluorescent paper is less than the preset number of the fluorescent filaments/fluorescent dots, manufacturing the bottom paper of the straw.

In order to solve the technical problem, the application adopts a technical scheme that: provides a straw base paper, which adopts the straw as aboveThe tube bottom paper is prepared by the method, and the quantitative amount of the tube bottom paper is 100-²The ash content of the bottom paper of the straw is 5-20%, the longitudinal stiffness of the bottom paper of the straw is greater than or equal to 10 g-cm, the transverse stiffness of the bottom paper of the straw is greater than or equal to 5 g-cm, the fracture degree of the bottom paper of the straw is 350-380kPa, the basis weight of the bottom paper of the straw is 100-140gsm, the thickness of the bottom paper of the straw is 130-180 mu m, the Cobb60 value of the bottom paper of the straw is 15-40gsm, the cohesive force of the bottom paper of the straw is 1-3 kg-cm, the stiffness of the bottom paper of the straw is 5-15 g-cm, the wet tensile strength of the bottom paper of the straw is greater than 0.6Kgf/15mm, the wet strength ratio of the bottom paper of the straw is 5-20%, and the fracture degree of the bottom paper of the straw is 250-400 kPa.

Wherein the quantitative amount of the bottom paper of the suction pipe is 115-120g/m²The ash content of the straw bottom paper is 5-11%, the basis weight of the straw bottom paper is 117.1gsm, the thickness of the straw bottom paper is 154.4 microns, the Cobb60 value of the straw bottom paper is 23.7gsm, the cohesion of the straw bottom paper is 2.6 kg-cm, the stiffness of the straw bottom paper is 6.2 g-cm, the wet strength ratio of the straw bottom paper is 12%, and the fracture degree of the straw bottom paper is 356.9 kPa.

Wherein the quantitative ratio of the bottom paper of the suction pipe is 115-²The ash content of the straw bottom paper is 5-11%, the basis weight of the straw bottom paper is 25.8gsm, the thickness of the straw bottom paper is 151.7 μm, the Cobb60 value of the straw bottom paper is 23.7gsm, the cohesion of the straw bottom paper is 2.8 kg-cm, the stiffness of the straw bottom paper is 5.9 g-cm, the wet strength ratio of the straw bottom paper is 10.5%, and the fracture degree of the straw bottom paper is 342.3 kPa.

In order to solve the technical problem, the application adopts a technical scheme that: a paper straw is provided, and the paper straw comprises the straw base paper.

The beneficial effect of this application is: different from the situation of the prior art, the straw backing paper adopts 60-75% of short fiber pulp and 25-40% of long fiber pulp, under the proportion range of long fibers and short fibers of the first paper pulp, a small amount of wet strength aid solution is added in batches before the paper making, and a small amount of wet strength aid solution is continuously added during the paper making process, so that the straw backing paper obtains higher wet strength fibrillation. Meanwhile, the preparation method of the application performs pre-drying on the dewatered third paper pulp, and then performs surface sizing, so that the surface strength of paper can be effectively improved. Therefore, the straw base paper has higher wet strength, higher stiffness and higher bursting strength. Compared with high wet strength paper, the paper has the advantages that the necessary strength is ensured by matching the high sizing degree and the medium and low wet strength, the use amount of the wet strength agent is effectively reduced, the energy consumption and pollution caused by high wet strength broken paper treatment are reduced, and the paper is more environment-friendly. Meanwhile, the paper straw made of the straw base paper can be buried in the soil, can be combusted to generate electricity, and can reduce pollution caused by plastics.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. Wherein:

FIG. 1 is a schematic flow chart illustrating one embodiment of a method for making a base paper for a straw according to the present application;

FIG. 2 is a schematic flow chart illustrating another embodiment of a method for making a base paper for a straw according to the present application;

FIG. 3 is a schematic flow chart illustrating a method for making a base paper for a straw according to another embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating a method for manufacturing a base paper for a straw according to still another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, the present application provides a method for manufacturing a straw base paper, which includes the following steps:

s101: providing first paper pulp, wherein the first paper pulp comprises the following components in percentage by mass: 60-75% of short fiber pulp and 25-40% of long fiber pulp.

Specifically, in order to increase the wet tensile strength and stiffness of the base paper of the straw, more long fibers can be selected in the embodiment. The first paper pulp comprises the following components in percentage by mass: fluff pulp 60-75% (e.g., 60%, 70%, or 75%), and long fiber pulp 25-40% (e.g., 40%, 30%, or 25%).

The fluff pulp may have a fiber length of 0.7 to 0.9mm (e.g., 0.7mm, 0.8mm, or 0.9mm), the fluff pulp may have a fiber length of 2.0 to 2.6mm (e.g., 2.0mm, 2.3mm, or 2.6mm), the fluff pulp may be hardwood bleached chemical pulp, and the long fiber pulp may be softwood bleached sulfur chemical pulp.

Wherein, the tree species of the needle-leaved wood bleached chemical pulp is at least one of southern pine, northern pine, spruce or oak; the species of the hardwood bleached chemical pulp is at least one of poplar, eucalyptus, acacia or maple. It should be noted that the above tree species are only for illustration, the straw base paper making method of the present application has no special requirements on tree species, and can be used for pulp preparation and paper making according to the actual existing pulp in a factory during actual production.

S102: respectively pulping the short fiber pulp and the long fiber pulp, and mixing the pulped short fiber pulp and long fiber pulp to obtain second paper pulp.

Specifically, hardwood bleached chemical pulp and softwood bleached sulfur chemical pulp are respectively subjected to pulp dispersing through a hydrapulper and then are respectively subjected to pulp grinding. And mixing the pulped pulp in a mixed pulp tank to obtain second paper pulp, and then storing the second paper pulp in a paper machine pulp tank.

S103: continuously adding a wet strength aid solution to the second pulp in an amount of 1-2 kg/ton of paper at a first predetermined time.

Specifically, the wet strength additive is continuously added by a screw pump after the second paper pulp is diluted by 10-15 times on line. Wherein the first preset time can be 8 hours before paper making. The wet strength aid solution is continuously added to the second pulp 8 hours before the start of papermaking in an amount of 1-2 kg/ton paper (e.g. 1 kg/ton paper, 1.5 kg/ton paper or 2 kg/ton paper).

S104: and continuously adding a wet strength aid solution into the second paper pulp at a second preset time, wherein the addition amount of the wet strength aid solution is 3-5 kg/ton of paper.

Specifically, the second preset time may be 4 hours before the beginning of papermaking. The wet strength aid solution is continuously added to the second pulp 4 hours before the start of papermaking in an amount of 3-5 kg/ton paper (e.g. 3 kg/ton paper, 4 kg/ton paper or 5 kg/ton paper).

S105: and manufacturing the mixed paper pulp, and continuously adding a wet strength additive solution into the second paper pulp during the paper manufacturing, wherein the addition amount of the wet strength additive solution is 5-15 kg/ton of paper, so as to prepare third paper pulp.

Specifically, when the mixed pulp is manufactured in the main paper making process, a wet strength aid solution is continuously added into the second pulp, and the addition amount of the wet strength aid solution is 5-15 kg/ton paper (for example, 5 kg/ton paper, 10 kg/ton paper or 15 kg/ton paper), so that third pulp is manufactured.

Wherein the wet strength aid is added in an amount of 5-20 kg (e.g. 5kg, 15 kg or 20 kg), preferably 7-15 kg (e.g. 7 kg, 11 kg or 15 kg), more preferably 8-12 kg (e.g. 8kg, 10kg or 12 kg) per ton of base paper of the straw.

S106: and adding filler and an internal sizing agent into the third paper pulp, screening and dehydrating, drying, surface sizing, drying and calendaring the third paper pulp to obtain the straw base paper.

Specifically, the filler may be one or more of calcium carbonate, talc, mineral fiber, mica, titanium dioxide, or filler grade china clay. The kaolin is preferably a filler grade kaolin. The filler can be used in an amount of 50-150 kg/ton paper. The filler consumption is increased, the ash content is increased, the consumption of wood fibers can be reduced, the forest protection is facilitated, and the influence on the ecological environment is reduced.

In order to reduce the strength loss that the increase of imbibition volume caused in the straw use, guarantee that the straw body stock keeps certain intensity, makes the straw be unlikely to take place to warp, soften after being fully soaked by liquid, this application uses binary glueing system to realize higher sizing degree: the third paper pulp is added with filler and internal sizing agent, dewatered on a wire, dried and subjected to surface sizing. And (3) performing post-stage drying after surface sizing, and performing calendaring by a calendar, monitoring by an online paper color and paper defect monitoring system, curling and rewinding to obtain a finished product.

The internal sizing agent may be an alkyl ketene dimer and/or alkenyl succinic anhydride, and may be used in an amount of 1 to 2.5 kg/ton of paper (e.g., 1 kg/ton of paper, 1.5 kg/ton of paper, or 2.5 kg/ton of paper).

Surface sizing agents include starch-based surface sizing agents and cationic surface sizing agents. The starch surface sizing agent is one of oxidized starch or enzyme-converted starch which takes one or more of cassava, potato, sweet potato, corn or wheat as raw materials. The cationic surface sizing agent is cationic polyacrylamide or polyamide polyurea resin (PAPU), cationic alkyl ketene dimer, cationic styrene-acrylate copolymer and the like, wherein the PAPU shows weak cationic property. The surface size may be used in an amount of 5-15 kg/ton of paper (e.g. 5 kg/ton of paper, 10 kg/ton of paper or 15 kg/ton of paper).

Preferably, the surface sizing agent may be a mixture of an alkyl ketene dimer and a styrene-acrylic polymer.

It should be noted that in the manufacturing process of the straw base paper, 10-30% of dry and wet broken paper is added, and the proportion is adjusted according to the actual production broken paper amount.

Different from the situation of the prior art, the straw backing paper adopts 60-75% of short fiber pulp and 25-40% of long fiber pulp, under the proportion range of long fibers and short fibers of the first paper pulp, a small amount of wet strength aid solution is added in batches before the paper making, and a small amount of wet strength aid solution is continuously added during the paper making process, so that the straw backing paper obtains higher wet strength fibrillation. Meanwhile, the preparation method of the application performs pre-drying on the dewatered third paper pulp, and then performs surface sizing, so that the surface strength of paper can be effectively improved. Therefore, the straw base paper has higher wet strength, higher stiffness and higher bursting strength. Compared with high wet strength paper, the paper has the advantages that the necessary strength is ensured by matching the high sizing degree and the medium and low wet strength, the use amount of the wet strength agent is effectively reduced, the energy consumption and pollution caused by high wet strength broken paper treatment are reduced, and the paper is more environment-friendly. Meanwhile, the suction pipe made of the suction pipe base paper can be buried in the soil, can also be combusted to generate electricity, and can reduce pollution caused by plastics.

Referring to fig. 2, in one embodiment, the step of adding filler and internal sizing agent to the third pulp includes the steps of:

s201: and the third paper pulp enters a high-level box, and the concentration of the third paper pulp is diluted to 1.0-1.5% by mass fraction.

Specifically, the third pulp overflows through the headbox, and the concentration of the third pulp is diluted with white water to a mass fraction of 1.0-1.5% (e.g., 1.0%, 1.2%, or 1.5%).

Wherein, the papermaking wastewater mainly comprises black liquor, middle-stage water and white water. The white water is water drained from a net part and a press part of a paper machine in the paper sheet forming process. The white water contains a large amount of fine fibers, inorganic fillers and various chemical additives, so the white water is generally reused for preparing papermaking pulp in the industry, which is not only favorable for environmental protection, but also can reasonably utilize various useful components in the white water to reduce the material cost. It will be appreciated that the white water used to dilute the third pulp is treated, and has a significant reduction in concentration, turbidity, conductivity, and COD.

S202: filler is added to the diluted third pulp at the inlet of the first fan pump.

Specifically, the filler is precipitated calcium carbonate, and the addition amount of the precipitated calcium carbonate is 50-150 kg/ton of paper.

The first fan pump is used for uniformly mixing the white water, the filler and the third paper pulp and providing power for conveying pulp in the system. In order to increase the bulk of the paper of the straw base to further improve the stiffness, precipitated calcium carbonate is selected as the filler, and the addition amount of the precipitated calcium carbonate is 50-150 kg/ton paper (50 kg/ton paper, 100 kg/ton paper or 150 kg/ton paper).

Preferably, the filler is precipitated calcium carbonate of Albacar type, the crystal form of the precipitated calcium carbonate is preferably in the form of spindle, the average particle size is about 2.0-2.6 μm, and the average particle size of C60 is less than 2 μm, therefore, the use of precipitated calcium carbonate of Albacar type is better than that of heavy calcium carbonate for improving the paper volume.

S203: and adding an internal sizing agent to the diluted third pulp at the outlet of the second fan pump to prepare fourth pulp.

Preferably, the internal sizing agent is alkenyl succinic anhydride, which is added in an amount of 1-2.5 kg/ton paper (e.g. 1 kg/ton paper, 1.5 kg/ton paper or 2.5 kg/ton paper).

In one embodiment, the step of surface sizing comprises: and (3) surface sizing is carried out on the paper after the upper wire is dewatered and dried.

Wherein, the sizing agent for surface sizing comprises the following components in percentage by mass: from 60% to 80% (e.g. 60%, 70% or 80%) of alkyl ketene dimer, from 20% to 40% (e.g. 20%, 30% or 40%) of styrene-acrylic polymer, and the amount of sizing agent added for surface sizing is from 5 to 15 kg/ton of paper (e.g. 5 kg/ton of paper, 10 kg/ton of paper or 15 kg/ton of paper).

Specifically, the surface sizing method can be a sizing method such as metering rod sizing, film transfer sizing, immersion sizing and the like, wherein the glue absorption amount is controlled to be 4-10 gsm.

This application uses the binary sizing system to realize higher sizing degree: the third paper pulp is added with filler and internal sizing agent, dewatered on a wire, dried and subjected to surface sizing. And (3) performing post-stage drying after surface sizing, and performing calendaring by a calendar, monitoring by an online paper color and paper defect monitoring system, curling and rewinding to obtain a finished product. By the mode, the strength loss caused by the increase of the liquid absorption amount in the using process of the straw can be reduced, and the straw bottom paper can be ensured to retain certain strength after being fully soaked by liquid, so that the straw is not deformed or softened.

Referring to fig. 3, in one embodiment, the step of separately pulping the fluff pulp and the fluff pulp includes the steps of:

s301: respectively diluting the long fiber pulp and the short fiber pulp to obtain diluted long fiber pulp with the mass concentration of 4.0-4.5% and diluted short fiber pulp with the mass concentration of 4.0-4.5%.

Specifically, the refining concentration (i.e. the mass concentration of the diluted long fiber pulp and the diluted short fiber pulp) is controlled according to the actual refining parameter requirement of the machine. Wherein, under the condition of high-concentration pulping, the fiber extrusion can help the fibrillation of the fiber, and the pulping pulp passes through a pulping machine through the pressure difference of an inlet and an outlet, and the time is counted by seconds. According to the conservation of energy, when the pulping machine acts, except the energy loss part, the rest of the pulping machine can generate heat due to the action of the cutter head on fibers, so that the temperature difference between the pulp entering and exiting the pulping machine is about 5 ℃, and the whole pulping temperature of the pulp is about 50-60 ℃.

S302: the diluted long fiber pulp is ground into 480ml with the freeness of 400-.

S303: the diluted short fiber pulp is grinded into 380ml with conical grinding until the freeness is 320-.

Specifically, the refining action is primarily to cut and fibrillate the fibers. The degree of refining is usually expressed in freeness (or CSF, canadian freeness).

By the method, the manufacturing method of the straw bottom paper can be used for enhancing the combination of pulp fibers and improving the strength of the pulp fibers by adjusting the types and the proportions of the fibers of the short fiber pulp and the long fiber pulp and adjusting the freeness of different fibers, so that the breaking strength of the straw bottom paper can be obviously improved.

Referring to fig. 4, in one embodiment, prior to the step of providing the first pulp, the method of making includes the steps of:

s401: and stopping the machine and performing alkali washing, acid washing and water washing on a pretreatment line, a white water line, a paper loss line and a medicine line of the paper machine at a third preset time to manufacture the fluorescence-free paper.

Specifically, the third preset time may be 10 days before papermaking.

S402: at a fourth preset time, sampling the non-fluorescent paper every 2 hours and carrying out a fluorescent reaction test.

Specifically, the fourth preset time may be 3 days before the papermaking.

S403: and when the number of the fluorescent filaments/fluorescent dots of the sample without the fluorescent paper is less than the preset number of the fluorescent filaments/fluorescent dots, manufacturing the bottom paper of the straw.

Specifically, the machine is shut down 10 days before straw paper is manufactured, paper machine pretreatment, a white water line, a paper loss line, a medicine line and the like are thoroughly washed by alkali and foaming agent, then acid washing and water washing are carried out, after the machine is started, common paper types without fluorescent whitening agent addition are manufactured by paper making and transition is carried out, and the type of added broken paper is strictly controlled; and (3) rolling down and sampling every 2 hours before papermaking for carrying out a fluorescence reaction test, emptying and cleaning a broke barrel tank when the quantity of fluorescent filaments/dots exceeds a standard, stopping and cleaning in a serious condition, and starting papermaking of the bottom paper of the straw when the fluorescence reaction is ensured to meet the requirement.

The application provides a straw base paper which is prepared by adopting the manufacturing method of the straw base paper. The quantitative ratio of the bottom paper of the straw is 100-²The ash content of the straw bottom paper is 5-20%, the longitudinal stiffness of the straw bottom paper is greater than or equal to 10g cm, the transverse stiffness of the straw bottom paper is greater than or equal to 5g cm, the cracking degree of the straw bottom paper is 350-380kPa, the basis weight of the straw bottom paper is 100-140gsm, the thickness of the straw bottom paper is 130-180 mu m, the Cobb60 value of the straw bottom paper is 15-40gsm, the cohesive force of the straw bottom paper is 1-3kg cm, the stiffness of the straw bottom paper is 5-15g cm, the wet tensile strength of the straw bottom paper is greater than 0.6Kgf/15mm, the wet strength ratio of the straw bottom paper is 5-20%, and the cracking degree of the straw bottom paper is 250-400 kPa.

In one embodiment, the quantitative amount of the bottom paper of the straw is preferably 115-120g/m²The ash content of the straw bottom paper is 5-11%, the basis weight of the straw bottom paper is 117.1gsm, the thickness of the straw bottom paper is 154.4 microns, the Cobb60 value of the straw bottom paper is 23.7gsm, the cohesion of the straw bottom paper is 2.6 kg-cm, the stiffness of the straw bottom paper is 6.2 g-cm, the wet strength ratio of the straw bottom paper is 12%, and the fracture degree of the straw bottom paper is 356.9 kPa.

In one embodiment, the quantitative amount of the bottom paper of the straw is preferably 115-²The ash content of the straw bottom paper is 5-11%, the basis weight of the straw bottom paper is 25.8gsm, the thickness of the straw bottom paper is 151.7 μm, the Cobb60 value of the straw bottom paper is 23.7gsm, the cohesion of the straw bottom paper is 2.8 kg-cm, the stiffness of the straw bottom paper is 5.9 g-cm, the wet strength ratio of the straw bottom paper is 10.5%, and the fracture degree of the straw bottom paper is 342.3 kPa.

The application provides a paper straw, and the paper straw is rolled up by straw body paper as aforesaid.

The following detailed description of embodiments of the present application will be made in conjunction with specific examples. The following examples are intended to illustrate the present application but should not be taken to limit the scope of the present application. The apparatus and methods used in the examples are, unless otherwise indicated, all those common in the art.

In the following examples, the quantitative determination of the straw base paper was carried out according to standard GB/T24328.5-2009; the ash content of the bottom paper of the straw is measured according to the standard GB/T22877-2008; the basis weight of the straw liner was measured by a basis weight valve on the paper machine; the thickness of the bottom paper of the straw is measured according to the standard GB/T24328.2-2009; the Cobb60 value of the straw liner was determined according to the bobbe test; the measuring method of the cohesion of the bottom paper of the straw is in accordance with the standard GBT 22365-; the method for measuring the stiffness of the base paper of the suction pipe is in accordance with the standard DB 44/T1033-2012; the wet strength ratio of the bottom paper of the straw is determined according to the standard GB/T24328.4-2009; the method for measuring the cracking degree of the straw base paper is measured by a cardboard cracking strength tester.

Example 1

A straw base paper comprises 30% of softwood bleached chemical pulp, 45% hardwood bleached chemical pulp, 5% wet loss and 20% dry loss. Grinding the bleached sulfur chemical pulp of the softwood by a disc mill, wherein the Canadian standard freeness is 420 ml; the broadleaf wood bleached chemical pulp is ground into pulp in a conical grinding mode, and the freeness is 380 ml.

The manufacturing method of the straw base paper comprises the following steps:

1) firstly, respectively pulping needle-leaf wood bleached sulfur chemical pulp and broadleaf wood bleached chemical pulp through a hydrapulper, and then respectively pulping;

2) and mixing the pulped pulp in a mixed pulp tank, storing the mixed pulp in a paper machine pulp tank, and adding a wet strength additive at the inlet of an outlet pump of the mixed pulp tank. The wet strength additive is added in a mode that the stock solution is diluted by 12.5 times on line and then is continuously added by a screw pump; 2kg/t was added 8 hours before starting the paper making, 5kg/t was added 4 hours before the paper making, and 10kg/t was added in the main paper making.

3) The slurry overflows through a head box, is diluted into thin slurry with the concentration of about 1 percent by white water, is added with a filler at the inlet of a No. 1 fan pump, is added with an internal sizing agent at the outlet of a No. 2 fan pump, is meshed with a net through a head box, and is pre-dewatered by adopting a water scraping plate and a vacuum dewatering device; further dewatering by a press part boot sleeve device;

4) in order to increase the bulk of the finished paper and further improve the stiffness, the filler is Albacar type precipitated calcium carbonate with the addition of 120kg/t

5) The dewatered pulp is pre-dried by 18 groups of drying cylinders and then is subjected to surface sizing by a soaking type sizing mode

6) The internal sizing agent adopts alkenyl succinic anhydride with the dosage of 1.6kg/t, and the surface sizing agent adopts the mixture of alkyl ketene dimer and styrene-acrylic acid polymer with the dosage of 10kg/t

7) After surface sizing, the mixture is dried at the later stage, and then is calendered by a calender, monitored by an on-line monitoring system for paper color and paper defects, curled and rewound to obtain a finished product

8) The paper quality is as follows: the basic physical properties of the finished product are as follows: basis weight 117.1g, thickness 154.4 μm, Cobb60 value 23.7gsm, cohesion 2.6 kg-cm, stiffness 6.2 g-cm, wet strength 12%, breaking strength 356.9 kPa.

Example 2

A straw base paper comprises 25% of softwood bleached chemical pulp, 55% hardwood bleached chemical pulp, 5% wet loss and 15% dry loss. Grinding the bleached sulfur chemical pulp of the softwood by a disc mill, wherein the Canadian standard freeness is 430 ml; the broadleaf wood bleached chemical pulp is ground by a cone mill, and the freeness is 420 ml.

The manufacturing method of the straw base paper comprises the following steps:

2) and mixing the pulped pulp in a mixed pulp tank, storing the mixed pulp in a paper machine pulp tank, and adding a wet strength additive at the inlet of an outlet pump of the mixed pulp tank. The wet strength additive is added in a mode that the stock solution is diluted by 10 times on line and then is continuously added by a screw pump; 2kg/t was added 8 hours before starting the paper making, 4kg/t was added 4 hours before the paper making, and 8kg/t was added in the main paper making.

4) in order to increase the bulk of the finished paper and further improve the stiffness, the filler is Albacar type precipitated calcium carbonate with the addition of 130kg/t

6) The internal sizing agent adopts alkenyl succinic anhydride with the dosage of 1.5kg/t, and the surface sizing agent adopts a mixture of alkyl ketene dimer and styrene-acrylic acid polymer with the dosage of 8kg/t

8) The paper quality is as follows: the basic physical properties of the finished product are as follows: basis weight 116.6g, thickness 151.7 μm, Cobb60 value 25.8gsm, cohesion 2.8 kg-cm, stiffness 5.9 g-cm, wet strength ratio 10.5%, breaking degree 342.3 kPa.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A manufacturing method of straw bottom paper is characterized by comprising the following steps:

providing first paper pulp, wherein the first paper pulp comprises the following components in percentage by mass: 60-75% of short fiber pulp and 25-40% of long fiber pulp;

respectively carrying out pulp dispersing on the short fiber pulp and the long fiber pulp, and mixing the short fiber pulp and the long fiber pulp after pulp dispersing to obtain second paper pulp;

continuously adding a wet strength additive solution into the second paper pulp at a first preset time, wherein the addition amount is 1-2 kg/ton of paper;

continuously adding the wet-strength aid solution into the second paper pulp at a second preset time, wherein the addition amount of the wet-strength aid solution is 3-5 kg/ton of paper;

manufacturing mixed paper pulp, and continuously adding the wet strength additive solution into the second paper pulp during paper manufacturing, wherein the addition amount of the wet strength additive solution is 5-15 kg/ton of paper, so as to prepare third paper pulp;

adding a filler and an internal sizing agent into the third paper pulp, and performing online dewatering, drying, surface sizing, drying and calendaring treatment to obtain the straw base paper;

wherein the step of separately dispersing the short fiber pulp and the long fiber pulp comprises:

respectively diluting the long fiber pulp and the short fiber pulp to obtain diluted long fiber pulp with the mass concentration of 4.0-4.5% and diluted short fiber pulp with the mass concentration of 4.0-4.5%;

grinding the diluted long fiber pulp by a disc mill until the freeness is 400-;

and (3) carrying out conical grinding on the diluted short fiber pulp until the freeness is 320-380 ml.

2. The method of claim 1, wherein the step of adding filler and internal size to the third pulp comprises:

the third paper pulp enters a high-level tank, and the concentration of the third paper pulp is diluted to 1.0-1.5% by mass;

adding filler to the diluted third pulp at the inlet of the first fan pump;

adding an internal sizing agent to the diluted third paper pulp at an outlet of a second fan pump to prepare fourth paper pulp;

wherein the filler is precipitated calcium carbonate, the addition amount of the precipitated calcium carbonate is 50-150 kg/ton of paper, the internal sizing agent is alkenyl succinic anhydride, and the addition amount of the alkenyl succinic anhydride is 1-2.5 kg/ton of paper.

3. The method of claim 2, wherein the step of surface sizing comprises:

surface sizing is carried out on the paper after the upper wire is dewatered and dried;

wherein, the sizing agent for surface sizing comprises the following components in percentage by mass: 60-80% of alkyl ketene dimer and 20-40% of styrene-acrylic acid polymer, wherein the addition amount of the sizing agent for surface sizing is 5-15 kg/ton paper.

4. The method of manufacturing according to claim 1,

the fiber length of the short fiber pulp is 0.7-0.9mm, and the short fiber pulp is hardwood bleached chemical pulp;

the fiber length of the long fiber pulp is 2.0-2.6mm, and the long fiber pulp is needle-leaved wood bleaching sulfur chemical pulp.

5. The method of making of claim 1, wherein prior to the step of providing the first pulp, the method of making comprises:

in a third preset time, stopping the machine and carrying out alkali washing, acid washing and water washing on a pretreatment line, a white water line, a paper loss line and a medicine line of the paper machine; manufacturing non-fluorescent paper;

sampling the non-fluorescent paper at intervals of 2 hours at a fourth preset time, and carrying out a fluorescent reaction test;

and when the number of the fluorescent filaments/fluorescent dots of the fluorescence-free paper sample is less than the preset number of the fluorescent filaments/fluorescent dots, manufacturing the bottom paper of the straw.

6. The straw base paper is characterized in that the straw base paper is prepared by the method for preparing the straw base paper according to any one of claims 1 to 5, and the quantitative amount of the straw base paper is 100-140g/m²The ash content of the straw bottom paper is 5-20%, the longitudinal stiffness of the straw bottom paper is greater than or equal to 10 g-cm, the transverse stiffness of the straw bottom paper is greater than or equal to 5 g-cm, the fracture degree of the straw bottom paper is 350-.

7. The pipette tip paper as recited in claim 6, wherein the basis weight of the pipette tip paper is 115-120g/m²The ash content of the straw bottom paper is 5-11%, the basis weight of the straw bottom paper is 117.1gsm, the thickness of the straw bottom paper is 154.4 microns, the Cobb60 value of the straw bottom paper is 23.7gsm, the cohesive force of the straw bottom paper is 2.6 kg-cm, the stiffness of the straw bottom paper is 6.2 g-cm, the wet strength ratio of the straw bottom paper is 12%, and the fracture degree of the straw bottom paper is 356.9 kPa.

8. The pipette tip of claim 6 wherein the basis weight of the pipette tip is 115-120/m²The ash content of the straw bottom paper is 5-11%, the basis weight of the straw bottom paper is 25.8gsm, the thickness of the straw bottom paper is 151.7 micrometers, the Cobb60 value of the straw bottom paper is 23.7gsm, the cohesive force of the straw bottom paper is 2.8 kg-cm, the stiffness of the straw bottom paper is 5.9 g-cm, the wet strength ratio of the straw bottom paper is 10.5%, and the fracture degree of the straw bottom paper is 342.3 kPa.

9. A paper drinking straw comprising the straw substrate according to any one of claims 6 to 8.