Low-air-permeability tipping paper base paper for cigarettes and preparation process of low-air-permeability tipping paper base paper
By improving the beating degree and adding non-porous fillers, combined with the refiner design and subsequent processing technology, the problem of high production cost of low-permeability cigarette tipping paper base paper was solved, achieving tighter fiber bonding and permeability control, and reducing production costs and energy consumption.
Patent Information
- Application Number
- CN202511230958.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-30
- Publication Date
- 2025-10-28
AI Technical Summary
The production cost of existing low-permeability cigarette tipping paper base paper is relatively high, and the permeability is difficult to control effectively.
The pulping process uses bleached softwood pulp and bleached hardwood pulp with a beating degree ≥70°SR, adds non-porous fillers and sizing agents, improves fiber refinement and bonding tightness through the design of the pulper, and controls air permeability by combining coating and calendering treatments.
This results in tighter fiber bonding, reduced porosity and air permeability, lower production costs, increased production efficiency, and reduced energy consumption.
Smart Images
Figure CN120844400A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of tipping paper technology, and particularly relates to a low-permeability cigarette tipping paper base paper and its preparation process. Background Technology
[0002] Cigarette tipping paper is one of the main materials used in cigarette products. It is used as the outer packaging material for cigarette filters and stems. Because its appearance resembles pine wood grain, it is also known as cork paper and belongs to the category of special industrial paper. After printing (coating) and slitting, cigarette tipping paper becomes tipping paper, commonly known as cork paper.
[0003] Low-permeability cigarette tipping paper is typically used in mid-to-high-end cigarettes, products that emphasize "rich flavor", or special-specification cigarettes (such as slim and medium-sized cigarettes) that require precise control of smoke parameters. It reduces air mixing, which can prevent dilution of smoke concentration and ensure taste.
[0004] The production cost of low-permeability cigarette tipping paper base paper is currently relatively high. Summary of the Invention
[0005] The purpose of this invention is to address the aforementioned technical problems by providing a low-permeability cigarette tipping paper base paper and its preparation process, which achieves a tighter bond between fibers and reduces porosity and air permeability.
[0006] In view of this, the present invention provides a process for preparing low-permeability cigarette tipping paper base paper, comprising the following steps: Step S1: Pulping. Two types of pulp, bleached softwood pulp and bleached hardwood pulp, are continuously pulped using a pulper, with a freeness ≥70°SR. Step S2: Papermaking, non-porous filler and neutral sizing agent are continuously added to the prepared mixed pulp, and a binary retention aid composed of cationic starch and CPAM is added. After the pulp is dewatered and formed by the wire section and the press section, the wet paper sheet enters the pre-drying stage for drying. Step S3: Coating. The printing side is coated with oxidized starch, and the non-printing side is coated with oxidized starch, PVA and food-grade oil repellent. The coated paper continues to dry. Step S4: Calendering, using a soft calender to treat the surface of the cigarette tipping paper base paper.
[0007] In this technical solution, the beating degree is increased to ≥70°SR, which makes the fibers finer and more fully combed through stronger mechanical action, resulting in tighter interfiber bonding and reduced porosity. At the same time, the pulp concentration is controlled to avoid local air permeability points caused by uneven fiber distribution. A small amount of non-porous filler, such as ultrafine calcium carbonate, is added to fill the fiber gaps and reduce air permeability.
[0008] Furthermore, the pulper includes: The housing has a feed pipe connected to it for the raw materials to enter; The grinding disc has two grinding discs arranged opposite each other. The grinding disc has an annular grinding zone for grinding raw materials. Grinding teeth are arranged in the grinding zone. The gap between the tops of the grinding teeth of the two grinding discs is the grinding space. The grinding disc has a raw material inlet. A blocking block is arranged in the center of the grinding disc. The blocking block is used to reduce the accumulation of raw materials in the center of the grinding disc after the raw materials enter from the raw material inlet. A drive motor is used to drive one of the grinding discs to rotate.
[0009] In this technical solution, a blocking block is formed between the centers of the two grinding discs, which concentrates the raw material feeding towards the edge of the grinding discs. This allows for better distribution of the feed material to the grinding zone, reducing fluctuations and unstable flow in the material feed, ultimately improving production efficiency and reducing unit energy consumption.
[0010] Furthermore, the blocking block is fixedly disposed at the center of one of the grinding discs, the blocking block is higher than the grinding teeth, and the distance from the blocking block to the surface of the other grinding disc is between 0.1mm and 0.2mm.
[0011] In this technical solution, the gap can make the gap between the centers of the two grinding discs very small, reducing the accumulation of raw materials in the center of the grinding discs, and can also ensure that the two grinding discs do not contact each other, thus ensuring safety during grinding.
[0012] Furthermore, the raw material inlets include multiple inlets that are evenly distributed circumferentially, the outer end of the blocking block extends to the space between two adjacent raw material inlets, and the edge of the blocking block is also provided with a clearance notch to make way for each raw material inlet.
[0013] Furthermore, the grinding zone includes a coarse grinding zone, a fine grinding zone, and a slag-reducing zone arranged sequentially from the center to the edge of the grinding disc. The coarse grinding zone, fine grinding zone, and slag-reducing zone are all annular. The coarse grinding zone, fine grinding zone, and slag-reducing zone are respectively provided with coarse grinding teeth, fine grinding teeth, and slag-reducing teeth. The height of the fine grinding teeth is higher than the height of the coarse grinding teeth, and the height of the coarse grinding teeth is higher than the slag-reducing teeth.
[0014] Furthermore, the gap between the tips of the grinding teeth in the fine grinding zone of the two grinding discs is 0.3mm-0.6mm, the gap between the tips of the grinding teeth in the loosening zone is 1mm-1.5mm, and the gap between the tips of the grinding teeth in the loosening zone is 0.6mm-0.9mm.
[0015] In this technical solution, after the raw material enters, it first enters the coarse grinding zone where it is ground by the coarse grinding teeth on two grinding discs that are far apart. Then it enters the fine grinding zone where it is ground by the fine grinding teeth on two grinding discs that are closest to each other. Finally, it enters the disintegration zone where the coarse grinding teeth on the two grinding discs are far apart, which makes it easier to disperse the fiber bundles formed by fine grinding with a lower intensity force and avoid over-grinding of the fibers.
[0016] Furthermore, the width of the fine grinding zone is greater than the width of the coarse grinding zone, and the width of the coarse grinding zone is greater than the width of the loosening zone.
[0017] In this technical solution, the time allocation of the three steps of coarse grinding, fine grinding and delamination can be controlled by setting the width of the coarse grinding zone, fine grinding zone and delamination zone.
[0018] Furthermore, the rough grinding teeth, fine grinding teeth, and sparse grinding teeth are staggered in the circumferential direction.
[0019] In this technical solution, the material can be guided to flow evenly into the next area during the rotation process.
[0020] Furthermore, the grinding teeth are provided with extending dispersing protrusions on both sides.
[0021] In this technical solution, the decomposing bumps can further break up the fiber bundles formed by fine grinding, avoiding over-grinding of the fibers.
[0022] Furthermore, a low-permeability cigarette tipping paper base paper is prepared using the above-mentioned preparation process.
[0023] The beneficial effects of this invention are: 1. Increase the beating degree to ≥70°SR, which makes the fibers finer and more fully combed through stronger mechanical action, resulting in tighter fiber bonding and reduced porosity; at the same time, control the pulp concentration to avoid local air permeability caused by uneven fiber distribution, and add a small amount of non-porous filler, such as ultrafine calcium carbonate, to fill the fiber gaps and reduce air permeability.
[0024] 2. A blocking block is formed between the centers of the two grinding discs, which concentrates the raw material feeding towards the edge of the grinding discs. This allows for better distribution of the feed material to the grinding zone, reducing fluctuations and unstable flow of the material feed, ultimately improving production efficiency and reducing unit energy consumption.
[0025] 3. After the raw material enters, it first enters the coarse grinding zone where it is ground by the coarse grinding teeth on the two grinding discs that are far apart. Then it enters the fine grinding zone where it is ground by the fine grinding teeth on the two grinding discs that are closest together. Finally, it enters the disintegration zone where the coarse grinding teeth on the two grinding discs are far apart, which makes it easier to break up the fiber bundles formed by fine grinding with a lower intensity force and avoid over-grinding the fibers.
[0026] 4. By setting the width of the coarse grinding zone, fine grinding zone, and descaling zone, the time allocation of the three steps of coarse grinding, fine grinding, and descaling can be controlled.
[0027] 5. The grinding teeth for coarse grinding, fine grinding, and loosening are staggered in the circumferential direction. This allows the material to be guided evenly into the next zone during rotation. Attached Figure Description
[0028] Figure 1 It is a 3D view of a pulp refiner; Figure 2 It is a cross-sectional view of two grinding discs; Figure 3 It is a 3D view of the millstone.
[0029] The markings in the diagram are as follows: 1. Shell; 2. Feed pipe; 3. Grinding disc; 4. Grinding space; 5. Blocking block; 6. Drive motor; 7. Raw material inlet; 8. Clearance notch; 9. Coarse grinding zone; 10. Fine grinding zone; 11. Disintegration zone; 12. Coarse grinding teeth; 13. Fine grinding teeth; 14. Disintegration grinding teeth; 15. Disintegration protrusion. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.
[0031] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0032] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0033] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0034] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
[0035] Example 1: A process for preparing a low-permeability cigarette tipping paper base paper includes the following steps: Step S1: Pulping. Two types of pulp, bleached softwood pulp and bleached hardwood pulp, are continuously pulped using a pulper, with a freeness ≥70°SR. Step S2: Papermaking, non-porous filler and neutral sizing agent are continuously added to the prepared mixed pulp, and a binary retention aid composed of cationic starch and CPAM is added. After the pulp is dewatered and formed by the wire section and the press section, the wet paper sheet enters the pre-drying stage for drying. Step S3: Coating. The printing side is coated with oxidized starch, and the non-printing side is coated with oxidized starch, PVA and food-grade oil repellent. The coated paper continues to dry. Step S4: Calendering, using a soft calender to treat the surface of the cigarette tipping paper base paper.
[0036] Increasing the beating degree to ≥70°SR allows for finer fibers, more complete fiber splitting, and tighter fiber bonding, reducing porosity. Simultaneously, controlling the pulp concentration avoids localized air permeability points caused by uneven fiber distribution. Adding a small amount of non-porous filler, such as ultrafine calcium carbonate, can fill the fiber gaps and reduce air permeability.
[0037] Example 2: like Figure 1-3 As shown, the pulper includes: The housing 1 is connected to a feed pipe 2 for feeding raw materials. There are two grinding discs 3, which are arranged opposite each other. The grinding discs 3 have an annular grinding zone for grinding raw materials. Grinding teeth are provided in the grinding zone. The gap between the tops of the grinding teeth of the two grinding discs 3 is the grinding space 4. The grinding discs 3 have a raw material inlet 7. A blocking block 5 is provided in the center of the grinding discs 3. The blocking block 5 is used to reduce the accumulation of raw materials in the center of the grinding discs 3 after the raw materials enter from the raw material inlet 7. A drive motor 6 is used to drive one of the grinding discs 3 to rotate.
[0038] A blocking block 5 is formed between the centers of the two grinding discs 3, which causes the raw material to be concentrated towards the edge of the grinding discs 3. Therefore, the feed material can be better distributed to the grinding zone, reducing fluctuations and unstable flow of the feed material, and ultimately improving production efficiency and reducing unit energy consumption.
[0039] The blocking block 5 is fixedly installed at the center of one of the grinding discs 3. The blocking block 5 is higher than the grinding teeth, and the distance from the blocking block 5 to the surface of the other grinding disc 3 is between 0.1mm and 0.2mm. This gap can make the gap between the centers of the two grinding discs 3 very small, reducing the accumulation of raw materials in the center of the grinding discs 3, and also ensure that the two grinding discs 3 do not contact each other, thus ensuring safety during grinding.
[0040] The raw material inlets 7 include multiple inlets and are evenly distributed around the circumference. The outer end of the blocking block 5 extends to the space between two adjacent raw material inlets 7. The edge of the blocking block 5 is also provided with a clearance notch 8 to make way for each raw material inlet 7.
[0041] The grinding zone includes a coarse grinding zone 9, a fine grinding zone 10, and a loosening zone 11 arranged sequentially from the center to the edge of the grinding disc 3. The coarse grinding zone 9, the fine grinding zone 10, and the loosening zone 11 are all annular. The coarse grinding zone 9, the fine grinding zone 10, and the loosening zone 11 are respectively provided with coarse grinding teeth 12, fine grinding teeth 13, and loosening grinding teeth 14. The height of the fine grinding teeth 13 is higher than the height of the coarse grinding teeth 12, and the height of the coarse grinding teeth 12 is higher than the height of the loosening grinding teeth 14.
[0042] The gap between the grinding teeth tips in the fine grinding zone 10 of the two grinding discs 3 is 0.3mm-0.6mm, the gap between the grinding teeth tips in the dispersing zone 11 is 1mm-1.5mm, and the gap between the grinding teeth tips in the dispersing zone 11 is 0.6mm-0.9mm. After the raw material enters, it first enters the coarse grinding zone 9 and is ground by the coarse grinding teeth 12 on the two grinding discs 3 that are far apart. Then it enters the fine grinding zone 10 and is ground by the fine grinding teeth 13 on the two grinding discs 3 that are closest to each other. Finally, it enters the dispersing zone 11. The coarse grinding teeth 12 on the two grinding discs 3 in the dispersing zone 11 are farthest apart, which makes it easier to disperse the fiber bundles formed by fine grinding with a lower intensity force and avoid over-grinding the fibers.
[0043] The width of the fine grinding zone 10 is greater than the width of the coarse grinding zone 9, and the width of the coarse grinding zone 9 is greater than the width of the loosening zone 11. By setting the widths of the coarse grinding zone 9, the fine grinding zone 10, and the loosening zone 11, the time allocation of the three steps of coarse grinding, fine grinding, and loosening can be controlled.
[0044] The coarse grinding teeth 12, the fine grinding teeth 13, and the loosening grinding teeth 14 are staggered in the circumferential direction. This allows the material to be guided along its flow direction during rotation. Figure 3 The direction indicated by the middle arrow is evenly moving into the next area.
[0045] The grinding teeth 14 have extending dispersing protrusions 15 on both sides. The dispersing protrusions 15 can further disperse the fiber bundles formed by fine grinding, avoiding over-grinding of the fibers.
[0046] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. A preparation process for a low-permeability cigarette tipping paper base paper, characterized in that... This includes the following steps: Step S1: Pulping. Two types of pulp, bleached softwood pulp and bleached hardwood pulp, are continuously pulped using a pulper, with a freeness ≥70°SR. Step S2: Papermaking, non-porous filler and neutral sizing agent are continuously added to the prepared mixed pulp, and a binary retention aid composed of cationic starch and CPAM is added. After the pulp is dewatered and formed by the wire section and the press section, the wet paper sheet enters the pre-drying stage for drying. Step S3: Coating. The printing side is coated with oxidized starch, and the non-printing side is coated with oxidized starch, PVA and food-grade oil repellent. The coated paper continues to dry. Step S4: Calendering, using a soft calender to treat the surface of the cigarette tipping paper base paper.
2. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 1, characterized in that... The pulping machine includes: The shell (1) is connected to a feed pipe (2) for feeding raw materials. Grinding disc (3), there are two grinding discs (3), the two grinding discs (3) are arranged opposite to each other, the grinding disc (3) has an annular grinding zone for grinding raw materials, grinding teeth are arranged in the grinding zone, the gap between the top of the grinding teeth of the two grinding discs (3) is the grinding space (4), the grinding disc (3) has a raw material inlet (7), and a blocking block (5) is arranged in the center of the grinding disc (3). The blocking block (5) is used to reduce the accumulation of raw materials in the center of the grinding disc (3) after the raw materials enter from the raw material inlet (7); A drive motor (6) is used to drive one of the grinding discs (3) to rotate.
3. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 2, characterized in that... The blocking block (5) is fixedly set at the center of one of the grinding discs (3). The blocking block (5) is higher than the grinding teeth. The distance between the blocking block (5) and the surface of the other grinding disc (3) is between 0.1mm and 0.2mm.
4. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 3, characterized in that... The raw material inlet (7) includes multiple inlets and is evenly distributed in a circumferential manner. The outer end of the blocking block (5) extends to the space between two adjacent raw material inlets (7). The edge of the blocking block (5) is also provided with a clearance notch (8) to make way for each raw material inlet (7).
5. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 4, characterized in that... The grinding zone includes a coarse grinding zone (9), a fine grinding zone (10) and a slurry grinding zone (11) arranged sequentially from the middle to the edge of the grinding disc (3). The coarse grinding zone (9), the fine grinding zone (10) and the slurry grinding zone (11) are all annular. The coarse grinding zone (9), the fine grinding zone (10) and the slurry grinding zone (11) are respectively provided with coarse grinding teeth (12), fine grinding teeth (13) and slurry grinding teeth (14). The height of the fine grinding teeth (13) is higher than the height of the coarse grinding teeth (12), and the height of the coarse grinding teeth (12) is higher than the height of the slurry grinding teeth (14).
6. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 5, characterized in that... The gap between the grinding teeth of the two grinding discs (3) in the fine grinding zone (10) is 0.3mm-0.6mm, the gap between the grinding teeth of the loosening zone (11) is 1mm-1.5mm, and the gap between the grinding teeth of the loosening zone (11) is 0.6mm-0.9mm.
7. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 6, characterized in that... The width of the fine grinding zone (10) is greater than the width of the coarse grinding zone (9), and the width of the coarse grinding zone (9) is greater than the width of the loosening zone (11).
8. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 7, characterized in that... The coarse grinding teeth (12), fine grinding teeth (13) and loosening grinding teeth (14) are staggered in the circumferential direction.
9. The preparation process of a low-permeability cigarette tipping paper base paper according to claim 8, characterized in that... The sparse grinding teeth (14) are provided with sparse protrusions (15) extending from both sides.
10. A low-permeability cigarette tipping paper base paper, characterized in that... It is prepared using the preparation process according to any one of claims 1-9.