CN111074667B - Core layer slurry of base paper for foaming cup, manufacturing process and base paper for foaming cup - Google Patents
Core layer slurry of base paper for foaming cup, manufacturing process and base paper for foaming cup Download PDFInfo
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- CN111074667B CN111074667B CN201911370841.0A CN201911370841A CN111074667B CN 111074667 B CN111074667 B CN 111074667B CN 201911370841 A CN201911370841 A CN 201911370841A CN 111074667 B CN111074667 B CN 111074667B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
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Abstract
The application discloses a core layer pulp of base paper for a foaming cup, a manufacturing process and base paper for the foaming cup, and belongs to the field of papermaking. The application discloses a core layer thick liquids of body paper for foaming cup includes: the free degree of the bleached broad-leaf sulfate pulp is 220ml to 280ml, and the percentage of the free degree of the bleached broad-leaf sulfate pulp in the oven-dry mass of the core layer pulp is 15 percent to 35 percent; the composite material also comprises bleached chemithermomechanical pulp which accounts for 50-60% of the oven-dried mass of the core layer pulp, and talcum powder which accounts for 4-6% of the oven-dried mass of the core layer pulp; the bleached needle-leaved sulfate pulp accounts for 2-5% of the oven-dry mass of the core layer pulp, and the cationic starch accounts for 1.2-1.4% of the oven-dry mass of the core layer pulp; the paper also comprises broke, and the weight percentage of the broke in the core layer pulp is 5-25%. The core layer slurry of the base paper for the foam cup disclosed by the application can meet the performance requirement of the foaming process on the base paper for the foam cup by allocating the selection and the performance of each component, so that the base paper has proper air permeability and better interlayer bonding force.
Description
Technical Field
The application relates to the field of papermaking, in particular to a core layer pulp of base paper for a foaming cup, a manufacturing process and the base paper for the foaming cup.
Background
The raw paper for the foaming cup is required to be heated in the foaming process in the manufacturing process of the foaming cup, the surface layer of the raw paper is slightly separated from the core layer due to water evaporation in the heating process, so that the raw paper for the foaming cup is required to have proper air permeability and good interlayer bonding force, further higher requirements are provided for the core layer slurry of the raw paper for the foaming cup, and the selection of the components of the core layer slurry, the performance of each component and the proportion of each component need to be regulated and controlled so as to meet the performance requirements of the foaming process on the raw paper for the foaming cup, so that the raw paper has proper air permeability and good interlayer bonding force.
Disclosure of Invention
The technical problem mainly solved by the application is to provide the core layer pulp of the base paper for the foaming cup, the manufacturing process and the base paper for the foaming cup, which can meet the performance requirement of the foaming process on the base paper for the foaming cup, so that the base paper has proper air permeability and better interlayer bonding force.
In order to solve the technical problem, the application adopts a technical scheme that:
provided is a core layer slurry of base paper for a foam cup, which is characterized by comprising: bleached broadleaf sulfate pulp, wherein the freeness of the bleached broadleaf sulfate pulp is 220ml-280 ml.
Further, the bleached broadleaf kraft pulp accounts for 15% -35% of the oven-dry mass of the core layer pulp.
Further, the core layer slurry further comprises: the core layer sizing agent comprises 50-60% of bleached chemithermomechanical pulp and 4-6% of talcum powder.
Further, the core layer slurry further comprises: the bleached softwood kraft pulp comprises 2% -5% of the oven-dry mass of the core layer pulp, and 1.2% -1.4% of the cationic starch.
Further, the cationic starch includes starch formed by introducing tertiary ammonium groups, quaternary ammonium groups, primary amine groups or quaternary amine groups to starch macromolecules.
Further, the core layer slurry further comprises: the paper broke comprises, by mass, 5% -25% of the oven-dried mass of the core layer pulp.
In order to solve the technical problem, the other technical scheme adopted by the application is as follows:
the preparation process of the base paper for the foaming cup comprises the following steps:
preparing bottom layer slurry, the core layer slurry and the surface layer slurry in the technical scheme;
respectively preparing a bottom layer, a core layer and a surface layer of the base paper by using the bottom layer slurry, the core layer slurry and the surface layer slurry;
and sequentially laminating the bottom layer, the core layer and the surface layer together, and performing post-treatment to form base paper.
Wherein the primer slurry comprises: bleached broadleaf sulfate pulp and bleached softwood sulfate pulp; wherein the bleached broadleaf sulfate pulp accounts for 60-80% of the oven dry mass of the bottom layer pulp, and the bleached softwood sulfate pulp accounts for 20-40% of the oven dry mass of the bottom layer pulp.
Wherein the facing slurry comprises: bleached broadleaf sulfate pulp and bleached softwood sulfate pulp; wherein the bleached broadleaf sulfate pulp accounts for 60-80% of the oven dry mass of the surface layer pulp, and the bleached needle leaf sulfate pulp accounts for 20-40% of the oven dry mass of the surface layer pulp.
In order to solve the above technical problem, another technical solution adopted by the present application is:
the raw paper for the foaming cup comprises a bottom layer, a core layer and a surface layer, and is manufactured by the manufacturing process of the technical scheme.
The beneficial effect of this application is: different from the prior art, the core layer pulp of the base paper for the foaming cup comprises bleached broadleaf sulfate pulp, the freeness of the bleached broadleaf sulfate pulp is adjusted to be 220-280 ml, the fibrillation degree is proper, the water filtration speed is proper, so that the air permeability is not too high and is not too low in a proper range, the evaporation rate of water in the foaming process is uniform, and the base paper prepared by the core layer pulp can meet the requirement of the foaming process on the air permeability of the base paper for the foaming cup.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description 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 of an embodiment of a process for producing a base paper for foam cups according to 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 apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In one embodiment of the present application, there is provided a core layer slurry of base paper for foam cups, including: bleached broadleaf sulphate pulp (LBKP), wherein the freeness of the bleached broadleaf sulphate pulp is between 220ml and 280 ml.
Canadian Standard Freeness (CSF) is one measure of drainage performance of a slurry, and generally speaking, the greater the freeness, the faster the drainage rate. The core layer slurry of the embodiment is used for manufacturing the core layer of the base paper for the foaming cup, and the base paper needs to have proper air permeability and strong interlayer bonding force in the foaming process for manufacturing the foaming cup. The method controls the freeness of the bleached broadleaf sulfate pulp to be 220ml-280ml, such as 220ml, 230ml, 240ml, 249ml, 260ml and 280ml, and embodies the degree of fibrillation. If the freeness is too low, fibrillation is better, air permeability is poorer, fibers are cut more, water filtering is poor due to low water filtering speed, the speed of a pulping machine is influenced, pulping energy consumption is high, and pulp capacity is influenced; on the contrary, if the freeness is too high, the fibrillation is worse, the air permeability is higher, and the performance requirement of the foaming process on the air permeability cannot be met. Because the foaming process needs to heat the base paper for the foaming cup, the surface layer of the base paper is slightly separated from the core layer due to the evaporation of water in the heating process, and the evaporation of the water needs to be controlled at a relatively uniform rate, the air permeability of the base paper needs to be controlled within a proper range, which cannot be too high or too low, so that the freeness of the bleached broadleaf sulfate pulp in the core layer pulp needs to be controlled within a proper range (220ml-280 ml).
In the core layer slurry provided by the embodiment, the percentage of the bleached broadleaf kraft pulp in the oven dry mass of the core layer slurry is 15% to 35%, for example, 15%, 20%, 25%, 30%, 35%, and the like. Compared with the common base paper pulp, the proportion of the bleached broadleaf sulfate pulp in the core layer pulp provided by the embodiment is obviously increased, so that the interlayer bonding force of the prepared base paper is improved, and the thickness and the stiffness of the base paper are kept.
Further, the core layer slurry provided by the embodiment further includes bleached chemithermomechanical pulp (BCTMP) and talc powder, wherein the bleached chemithermomechanical pulp accounts for 50% to 60%, for example, 50%, 55%, 60%, and the like, of the oven dry mass of the core layer slurry, and the talc powder accounts for 4% to 6%, for example, 4%, 5%, 6%, and the like, of the oven dry mass of the core layer slurry.
Compared with the common base paper pulp, the addition amount of the bleached chemithermomechanical pulp in the embodiment is low, which is beneficial to further controlling the air permeability of the base paper on the premise of not losing the thickness and the stiffness of the prepared base paper. In addition, the air permeability is finely adjusted by adding the talcum powder filler, so that the prepared base paper for the foaming cup can meet the air permeability requirement of a foaming process. Compared with the common base paper sizing agent, the addition amount of the talcum powder is low in the embodiment, so that the interlayer bonding force of the prepared base paper is further improved.
Further, the core layer slurry provided by the present embodiment further includes bleached softwood kraft (NBKP) and cationic starch, wherein the bleached softwood kraft is 2% to 5%, for example, 2%, 3%, 4%, 5%, and the like, by the absolute dry mass of the core layer slurry, and the cationic starch is 1.2% to 1.4%, for example, 1.2%, 1.3%, 1.4%, and the like, by the absolute dry mass of the core layer slurry. Wherein, the cationic starch comprises starch formed by introducing tertiary ammonium groups, quaternary ammonium groups, primary amine groups or quaternary amine groups on starch macromolecules.
The embodiment further improves the interlayer bonding force of the prepared base paper by adjusting the proportion of the bleached softwood kraft pulp to the cationic starch. The cationic starch has high retention rate, is added into the pulp of the core layer and is adsorbed by a large amount of fibers in the pulp, and in the process of manufacturing the base paper, the cationic starch enables anionic fibers to flocculate together and increases the retention rate of fine fibers, so that the combination of the fibers is facilitated, the interlayer binding force of the manufactured base paper can be further improved, and the requirement of a foaming process is met.
Further, the core layer slurry provided by the present embodiment further includes broke, wherein the percentage of the broke in the oven-dry mass of the core layer slurry is 5% to 25%, for example, 5%, 15%, 25%, and the like.
The base paper prepared by the core layer pulp provided by the embodiment can meet various performance requirements on the base paper in the foaming process.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a process for manufacturing base paper for a foam cup of the present application, including:
s101, preparing bottom layer slurry, the core layer slurry and the surface layer slurry according to any one of the above embodiments.
The bottom layer pulp comprises bleached broadleaf sulfate pulp and bleached softwood sulfate pulp, wherein the percentage of the bleached broadleaf sulfate pulp in the oven dry mass of the bottom layer pulp is 60% -80%, such as 60%, 70%, 80% and the like, and the percentage of the bleached softwood sulfate pulp in the oven dry mass of the bottom layer pulp is 20% -40%, such as 20%, 30%, 40% and the like.
Wherein the core layer pulp comprises bleached broadleaf sulfate pulp, bleached chemithermomechanical pulp, talcum powder, bleached softwood sulfate pulp, cationic starch and broke, wherein the bleached broadleaf sulfate pulp accounts for 15-35%, such as 16%, 21%, 26%, 31%, 34% and the like of the absolute dry mass of the core layer pulp, the bleached chemithermomechanical pulp accounts for 50-60%, such as 51%, 54%, 59% and the like of the absolute dry mass of the core layer pulp, the talcum powder accounts for 4-6%, such as 4.5%, 5.5%, 5.8% and the like of the absolute dry mass of the core layer pulp, the bleached softwood sulfate pulp accounts for 2-5%, such as 2.5%, 3.5%, 4.5% and the like of the absolute dry mass of the core layer pulp, the cationic starch accounts for 1.2-1.4%, such as 1.2%, 1.3%, and the like of the absolute dry mass of the core layer pulp, 1.4%, etc., and the percentage of broke in the oven-dried mass of the core layer pulp is 5-25%, e.g., 6%, 16%, 24%, etc.
The top layer pulp comprises bleached broadleaf sulfate pulp and bleached softwood sulfate pulp, wherein the bleached broadleaf sulfate pulp accounts for 60% -80%, such as 60%, 70%, 80% and the like of the top layer pulp in absolute dry mass, and the bleached softwood sulfate pulp accounts for 20% -40%, such as 20%, 30%, 40% and the like of the top layer pulp in absolute dry mass.
And S102, preparing the bottom layer, the core layer and the surface layer of the base paper respectively by using the bottom layer sizing agent, the core layer sizing agent and the surface layer sizing agent.
And S103, sequentially laminating the bottom layer, the core layer and the surface layer together, and performing post-treatment to form base paper. In particular, the post-treatment may include the steps of pressing, drying, sizing, drying, calendering, and reeling.
The base paper manufactured by the manufacturing process of the base paper for the foaming cup provided by the embodiment meets various performance requirements on the base paper in the foaming process.
In another embodiment of the present application, there is provided a base paper for a foam cup, comprising a bottom layer, a core layer and a surface layer, wherein the base paper is manufactured by the manufacturing process according to any one of the above embodiments. For details, reference may be made to the above embodiments, which are not described herein again.
The base paper for the foam cup is required to have proper air permeability (70ml/min-130ml/min) and higher interlayer bonding force (250J/m)2-300J/m2) The base paper prepared by using the core layer pulp provided by the application is characterized by combining specific examples, wherein the comparative example is common paper, the proportions of the bottom layer pulp and the surface layer pulp adopted in examples 1-4 are completely the same, the air permeability is tested by a Tertiary air permeability tester under the condition of 1.47kPa, and the test condition of the oven moisture is 4 hours at 105 DEG CThen (c) is performed.
Referring to tables 1 and 2, Table 1 shows the core layer size ratios of comparative examples and examples 1-4, and Table 2 shows the quality index comparison of base papers obtained in comparative examples and examples 1-4. The proportioning unit of each component in table 1 is percentage, which means that each component accounts for the oven dry mass of the core layer slurry. In example 4, the addition amount of talc was increased to 10% and exceeded the range of 4% to 6% on the premise that the other components were consistent, as shown in table 2, in example 4, compared with example 3, the interlayer bonding strength and air permeability of the base paper for foam cups did not satisfy the requirements for interlayer bonding strength and air permeability, and other quality indexes were also comparable to those of the comparative example, and therefore, the base paper was more suitable for the common cupped base paper. Examples 1 to 3 are specific examples of the present application, and it can be seen from table 1 that the mixture ratio of each component and the freeness of bleached broadleaf kraft pulp are within the aforementioned ranges, and from table 2 that the interlayer bonding force and air permeability of examples 1 to 3 both satisfy the requirements of the base paper for foam cups on the interlayer bonding force and air permeability, and other quality indexes are equivalent, and the difference from the comparative example is equivalent, it can be seen that each quality index of the base paper prepared from the core layer pulp of the base paper for foam cups provided by the present application can satisfy the requirements of the foaming process.
Table 1: core layer slurry proportioning for comparative examples and examples 1-4
| Components | Unit of | Comparative example | Example 1 | Example 2 | Example 3 | Example 4 |
| LBKP | ％ | 13 | 30 | 25 | 20 | 20 |
| LBKP freeness | ml | 248 | 248 | 245 | 252 | 252 |
| CBTMP | ％ | 59 | 50 | 55 | 60 | 60 |
| NBKP | ％ | 1 | 3 | 3 | 3 | 3 |
| Cationic starch | ％ | 2 | 1.3 | 1.3 | 1.3 | 1.3 |
| Talcum powder | ％ | 10 | 5 | 5 | 5 | 10 |
| Broke | ％ | 25 | 17 | 17 | 17 | 17 |
Table 2: comparison of the quality indexes of base papers obtained in comparative example and examples 1 to 4
| Quality index | Unit of | Comparative example | Example 1 | Example 2 | Example 3 | Example 4 |
| Interlayer bonding force | J/m2 | 203 | 271 | 266 | 255 | 195 |
| Air permeability top | ml/min | 178.5 | 92 | 112 | 122 | 168 |
| Air permeability bot | ml/min | 176.4 | 97 | 115 | 128 | 170 |
| CD elongation | ％ | 4.18 | 5.1 | 4.85 | 4.72 | 4.3 |
| Moisture content of oven | ％ | 7.5 | 7.1 | 7.2 | 7.1 | 7.2 |
| Ash content of paper | ％ | 8.58 | 5 | 5.2 | 5.1 | 7.92 |
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (9)
1. A core layer slurry of base paper for a foam cup, characterized by comprising:
bleached broadleaf sulfate pulp, wherein the freeness of the bleached broadleaf sulfate pulp is 220ml-280ml so as to reflect the degree of fibrillation of fibers and control the air permeability of the base paper;
the core layer slurry further comprises: the air permeability of the core layer pulp is controlled by the bleached chemithermomechanical pulp, and the air permeability of the core layer pulp is adjusted by the talcum powder, wherein the bleached chemithermomechanical pulp accounts for 50% -55% of the oven dry mass of the core layer pulp, and the talcum powder accounts for 4% -6% of the oven dry mass of the core layer pulp.
2. The core layer slurry of claim 1, wherein the bleached broadleaf kraft pulp comprises 15% to 35% of the oven dried mass of the core layer slurry.
3. The core layer slurry of claim 1, further comprising:
the bleached softwood kraft pulp comprises 2% -5% of the oven-dry mass of the core layer pulp, and 1.2% -1.4% of the cationic starch.
4. Core layer slurry according to claim 3,
the cationic starch comprises starch formed by introducing tertiary ammonium groups, quaternary ammonium groups, primary amine groups or quaternary amine groups on starch macromolecules.
5. The core layer slurry of claim 1, further comprising:
the paper broke comprises, by mass, 5% -25% of the oven-dried mass of the core layer pulp.
6. A manufacturing process of base paper for a foam cup is characterized by comprising the following steps:
formulating a primer slurry, a core layer slurry according to any one of claims 1 to 5 and a face layer slurry;
respectively preparing a bottom layer, a core layer and a surface layer of the base paper by using the bottom layer slurry, the core layer slurry and the surface layer slurry;
and sequentially laminating the bottom layer, the core layer and the surface layer together, and performing post-treatment to form base paper.
7. The process of claim 6, wherein the primer slurry comprises:
bleached broadleaf sulfate pulp and bleached softwood sulfate pulp;
wherein the bleached broadleaf sulfate pulp accounts for 60-80% of the oven dry mass of the bottom layer pulp, and the bleached softwood sulfate pulp accounts for 20-40% of the oven dry mass of the bottom layer pulp.
8. The process of claim 6, wherein the facecoat slurry comprises:
bleached broadleaf sulfate pulp and bleached softwood sulfate pulp;
wherein the bleached broadleaf sulfate pulp accounts for 60-80% of the oven dry mass of the surface layer pulp, and the bleached needle leaf sulfate pulp accounts for 20-40% of the oven dry mass of the surface layer pulp.
9. A base paper for a foam cup comprises a bottom layer, a core layer and a surface layer, and is characterized in that,
the base paper is manufactured by the manufacturing process of any one of claims 6 to 8.
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| CA2549332A1 (en) * | 2005-06-30 | 2006-12-30 | Weyerhaeuser Company | Insulating paperboard |
| JP2012219381A (en) * | 2011-04-04 | 2012-11-12 | Oji Paper Co Ltd | Paper cup base paper |
| CN202116946U (en) * | 2011-06-08 | 2012-01-18 | 江阴宇昊复合材料科技有限公司 | Heat insulation foaming paper |
| CN102277792A (en) * | 2011-08-15 | 2011-12-14 | 刘天树 | Compound foaming paper product and preparation method and application thereof |
| CN107044069A (en) * | 2017-03-28 | 2017-08-15 | 广西金桂浆纸业有限公司 | The manufacture craft of cupstock |
| CN107738490A (en) * | 2017-09-29 | 2018-02-27 | 江阴润渲纸业有限公司 | A kind of heat insulation foaming paper and preparation method thereof |
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