U.S. patent application number 16/215968 was filed with the patent office on 2020-06-11 for preparation method of tobacco sheets with a reduced quantity of wood pulp fibers.
This patent application is currently assigned to Henan Cigarette Industry Tobacco Sheet., Ltd. The applicant listed for this patent is Henan Cigarette Industry Tobacco Sheet., Ltd Tianjin University of Science & Technology. Invention is credited to Xinshun Fan, Chong Luo, Xiaohui Tian, Wenling Wang, Yanqing Wang, Yangbing Wen, Chaowei Wu, Haijian Yang.
Application Number | 20200178590 16/215968 |
Document ID | / |
Family ID | 70972713 |
Filed Date | 2020-06-11 |
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United States Patent
Application |
20200178590 |
Kind Code |
A1 |
Wu; Chaowei ; et
al. |
June 11, 2020 |
PREPARATION METHOD OF TOBACCO SHEETS WITH A REDUCED QUANTITY OF
WOOD PULP FIBERS
Abstract
The present invention provides a preparation method of tobacco
sheets with a reduced quantity of wood pulp fibers, and belongs to
the technical field of reconstituted tobacco. The method includes
the steps of: cooking tobacco stem materials by alkaline process,
and filtering and washing the cooked tobacco stem materials to
obtain tobacco stem fibers; generating mixed pulp by mixing wood
pulp fibers, tobacco pulp, filling materials, water and the tobacco
stem fibers together as per certain proportions, and subjecting the
mixed pulp to a papermaking process in a paper machine to obtain
tobacco sheets. By means of adding tobacco stem fibers, the present
invention effectively reduces the quantity of wood pulp fibers,
ensures the continuous operation of the paper machine, and
effectively improves the bulk and tensile index of prepared tobacco
sheets. Furthermore, the present invention reduces the quantity of
wood pulp fibers, improves the flavor of tobacco, and effectively
relieves the negative effect of excessive wood pulp fibers on the
flavor of tobacco.
Inventors: |
Wu; Chaowei; (Xuchang City,
CN) ; Wang; Wenling; (Xuchang City, CN) ; Fan;
Xinshun; (Xuchang City, CN) ; Tian; Xiaohui;
(Xuchang City, CN) ; Yang; Haijian; (Xuchang City,
CN) ; Luo; Chong; (Xuchang City, CN) ; Wang;
Yanqing; (Xuchang City, CN) ; Wen; Yangbing;
(Tianjin, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Henan Cigarette Industry Tobacco Sheet., Ltd
Tianjin University of Science & Technology |
Xuchang City
Tianjin |
|
CN
CN |
|
|
Assignee: |
Henan Cigarette Industry Tobacco
Sheet., Ltd
Xuchang City
CN
Tianjin University of Science & Technology
Tianjin
CN
|
Family ID: |
70972713 |
Appl. No.: |
16/215968 |
Filed: |
December 11, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A24B 15/12 20130101;
D21H 17/675 20130101; A24B 3/14 20130101; D21H 11/12 20130101; D21H
27/00 20130101 |
International
Class: |
A24B 3/14 20060101
A24B003/14; D21H 11/12 20060101 D21H011/12; D21H 17/67 20060101
D21H017/67 |
Claims
1. A preparation method of tobacco sheets with a reduced quantity
of wood pulp fibers, comprising the following steps: (1) cooking
tobacco stem materials by alkaline process, and filtering and
washing the cooked tobacco stem materials to obtain tobacco stem
fibers; and (2) generating mixed pulp by mixing wood pulp fibers,
tobacco pulp, filling materials, water and the tobacco stem fibers
obtained in step (1) together as per certain proportions, and
subjecting the mixed pulp to a papermaking process in a paper
machine to obtain tobacco sheets.
2. The preparation method according to claim 1, wherein the tobacco
stem fibers in step (1) have a length of 0.1-0.5 mm and a diameter
of 0.5-2 .mu.m.
3. The preparation method according to claim 1, wherein in step
(1), strong alkali, the tobacco stem materials and water are mixed
and then cooked, the strong alkali has a mass concentration of
15-50%, and a mass ratio of the tobacco stem materials to the
strong alkali is (4.5-5.5):1.
4. The preparation method according to claim 2, wherein in step
(1), strong alkali, the tobacco stem materials and water are mixed
and then cooked, the strong alkali has a mass concentration of
15-50%, a mass ratio of the tobacco stem materials to the strong
alkali is (4.5-5.5):1.
5. The preparation method according to claim 1, wherein in step
(1), the cooking is conducted at a temperature of 150-180.degree.
C. for a time of 1-4 h.
6. The preparation method according to claim 2, wherein in step
(1), the cooking is conducted at a temperature of 150-180.degree.
C. and a time of cooking is 1-4 h.
7. The preparation method according to claim 1, wherein in step
(2), the tobacco stem fibers in the mixed pulp have a mass content
of 0.1-3%.
8. The preparation method according to claim 1, wherein in step
(2), the wood pulp fibers in the mixed pulp have a mass content of
14-22%.
9. The preparation method according to claim 7, wherein in step
(2), the wood pulp fibers in the mixed pulp have a mass content of
14-22%.
10. The preparation method according to claim 1, wherein in step
(2), the filling materials comprise calcium carbonate.
11. The preparation method according to claim 1, wherein in step
(2), the filling materials in the mixed pulp have a mass content of
8-20%.
12. The preparation method according to claim 1, wherein in step
(2), the filling materials comprise calcium carbonate and wherein
the filling materials in the mixed pulp have a mass content of
8-20%.
13. The preparation method according to claim 1, wherein in step
(2), the tobacco pulp comprises tobacco stem pulp and tobacco leaf
pulp, and the tobacco pulp has a mass concentration of 5-15%.
14. The preparation method according to claim 1, wherein in step
(2), the mixed pulp has a mass concentration of 0.1-1.0%.
15. The preparation method according to claim 7, wherein in step
(2), the mixed pulp has a mass concentration of 0.1-1.0%.
16. The preparation method according to claim 10, wherein in step
(2), the mixed pulp has a mass concentration of 0.1-1.0%.
17. The preparation method according to claim 13, wherein in step
(2), the mixed pulp has a mass concentration of 0.1-1.0%.
Description
TECHNICAL FIELD
[0001] The present invention relates to the field of reconstituted
tobacco, in particular to a preparation method of tobacco sheets
with a reduced quantity of wood pulp fibers.
BACKGROUND
[0002] The production of tobacco sheets is most commonly done by
the papermaking process. In order to keep the paper machine in
continuous operation during production, some wood pulp fibers for
making paper generally need to be added in the process of producing
tobacco sheets. This addition enables tobacco pulp to be molded
smoothly in the papermaking system, ensuring continuous operation
of the paper machine. Furthermore, the added wood pulp fibers can
serve as the skeleton of tobacco sheets to help improve the
strength of tobacco sheets.
[0003] However, adding wood pulp fibers has certain negative
effects on the flavor of tobacco sheets. The addition of wood pulp
fibers produces a wood smell in smoking tobacco sheets, thus
reducing the original scent of tobacco.
SUMMARY
[0004] In order to solve the aforementioned technical problem, the
prevent invention provides a preparation method of tobacco sheets
with a reduced quantity of wood pulp fibers. The preparation method
disclosed by the present invention effectively reduces the quantity
of wood pulp fibers and still allows tobacco pulp to be molded
smoothly in the papermaking system. In addition, the resulting
tobacco sheets have high or increased strength.
[0005] The present invention provides a preparation method of
tobacco sheets with a reduced quantity of wood pulp fibers,
including the following steps:
[0006] (1) cooking tobacco stem materials by alkaline process, and
filtering and washing the cooked tobacco stem materials to obtain
tobacco stem fibers; and
[0007] (2) generating mixed pulp by mixing wood pulp fibers,
tobacco pulp, filling materials, water and the tobacco stem fibers
obtained in step (1) together as per certain proportions, and
subjecting the mixed pulp to a papermaking process in a paper
machine to obtain tobacco sheets.
[0008] Preferably, the length of the tobacco stem fibers in step
(1) is preferably about 0.1-0.5 mm and the diameter is about 0.5-2
p.m.
[0009] Preferably, in step (1), strong alkali, the tobacco stem
materials and water are mixed and then cooked, the mass
concentration of the strong alkali is 15-50%, and the mass ratio of
the tobacco stem materials to the strong alkali is (4.5-5.5):1.
[0010] Preferably, in step (1), the temperature for cooking is
150-180.degree. C. and the time for cooking is 1-4 h.
[0011] Preferably, in step (2), the mass content of the tobacco
stem fibers in the mixed pulp is 0.1-3%.
[0012] Preferably, in step (2), the mass content of the wood pulp
fibers in the mixed pulp is 14-22%.
[0013] Preferably, in step (2), the filling materials comprise
calcium carbonate.
[0014] Preferably, in step (2), the mass content of the filling
materials in the mixed pulp is 8-20%.
[0015] Preferably, in step (2), the tobacco pulp includes tobacco
stem pulp and tobacco leaf pulp, and the mass concentration of the
tobacco pulp is 5-15%.
[0016] Preferably, in step (2), the mass concentration of the mixed
pulp in the tobacco sheets is 0.1-1.0%.
[0017] The preparation method of the tobacco sheets with a reduced
quantity of wood pulp fibers, provided by the invention includes
the steps of: cooking tobacco stem materials by alkaline process,
and filtering and washing the cooked tobacco stem materials to
obtain tobacco stem fibers; generating mixed pulp by mixing wood
pulp fibers, tobacco pulp, filling materials, water and the tobacco
stem fibers together as per certain proportions, and subjecting the
mixed pulp to a papermaking process in a paper machine to obtain
tobacco sheets. By means of adding tobacco stem fibers, the present
invention effectively reduces the quantity of wood pulp fibers,
ensures the continuous operation of the paper machine, and
effectively improves the bulk and tensile index of prepared tobacco
sheets. Furthermore, by reducing the quantity of wood pulp fibers,
the present invention improves the flavor of tobacco effectively
relieving the negative effect of excessive wood pulp fibers on the
flavor of tobacco.
BRIEF DESCRIPTION OF THE DRAWING
[0018] FIG. 1 shows a scanning electron microscope picture of the
tobacco stem fibers after being cooked in a strong alkali solution
in preferred embodiment 1 of the present invention.
DETAILED DESCRIPTION
[0019] The present invention provides a preparation method of
tobacco sheets with a reduced quantity of wood pulp fibers, which
includes the following steps:
[0020] (1) cooking tobacco stem materials by alkaline process, and
filtering and washing the cooked tobacco stem materials to obtain
tobacco stem fibers; and
[0021] (2) generating mixed pulp by mixing wood pulp fibers,
tobacco pulp, filling materials, water and the tobacco stem fibers
obtained in step (1) together as per certain proportions, and
subjecting the mixed pulp to a papermaking process in a paper
machine to obtain tobacco sheets.
[0022] In the present invention, an alkaline process is adopted to
cook tobacco stem materials to obtain cooked aqueous pulp.
[0023] In the present invention, an aqueous solution of strong
alkali, the tobacco stem materials and water are mixed and then
cooked. The mass concentration of the aqueous solution of strong
alkali is preferably 15-50%, more preferably 20-40%, and most
preferably 25-35%. The aqueous solution of strong alkali preferably
includes an aqueous sodium or potassium hydroxide solution.
[0024] In the present invention, the mass ratio of the tobacco stem
materials to the aqueous solution of strong alkali is preferably
(4.5-5.5):1 and more preferably 5:1.
[0025] In the present invention, the solid-liquid mass ratio in the
mixture of the aqueous solution of strong alkali, tobacco stem
materials and water is preferably 1:(4.5-5.5) and more preferably
1:5.
[0026] In the present invention, the temperature for the cooking is
preferably 150-180.degree. C. and more preferably 160-170.degree.
C.; the time is preferably 1-4 h and more preferably 2-3 h.
[0027] In cooking by alkaline process in the present invention,
substances in tobacco stems such as lignin and pectin can dissolve
in the strong alkali solution. Tobacco stem fibers in tobacco stems
are insoluble in the strong alkali solution. Follow-up filtration
helps extract tobacco stem fibers.
[0028] Cooked aqueous pulp is obtained after cooking. In the
present invention, the cooked aqueous pulp is filtered to obtain
tobacco stem fibers.
[0029] The present invention imposes no specific limitation on the
implementation of filtration in the present invention, and any mode
of filtration well known by those skilled in the art may be
adopted.
[0030] After filtration, the cooked fibers are preferably washed
with water. The present invention imposes no specific limitation on
the implementation of washing in the present invention, and any
washing mode well known by those skilled in the art may be
adopted.
[0031] In the present invention, the length of the tobacco stem
fibers obtained by the above modes is preferably 0.1-0.5 mm and
more preferably 0.2-0.4 mm; the diameter is preferably 0.5-2 .mu.m
and more preferably 1.0-1.5 .mu.m; the Kappa number of the tobacco
stem fibers is preferably 3-10, more preferably 4-9 and most
preferably 5-8. In the present invention, the tobacco stem fibers,
having been cooked in the strong alkaline solution, have ideal
length, diameter and Kappa number, and thus, the strength of
tobacco sheets is improved and the smooth operation of the paper
machine is ensured.
[0032] In the present invention, after the tobacco stem fibers are
obtained, mixed pulp is generated by mixing wood pulp fibers,
tobacco pulp, filling materials, water and the tobacco stem fibers
together as per certain proportions, and tobacco sheets are
obtained by subjecting the mixed pulp to a papermaking process in a
paper machine.
[0033] In the present invention, the mass content of the wood pulp
fibers in the mixed pulp is preferably 14-22%, more preferably
15-19% and most preferably 16-18%.
[0034] In the present invention, the mass content of the tobacco
stem fibers in the mixed pulp is preferably 0.1-3%, more preferably
0.5-2.5% and most preferably 1.0-2.0%.
[0035] By adding tobacco stem fibers during the preparation of
tobacco sheets, the present invention effectively reduces the
quantity of wood pulp fibers and effectively improves the strength
of tobacco sheets.
[0036] In the present invention, the tobacco pulp preferably
includes tobacco stem pulp and tobacco leaf pulp; the mass
concentration of the tobacco pulp is preferably 5-15% and more
preferably 8-12%. In the present invention, the solvent in the
tobacco pulp is preferably water.
[0037] In the present invention, the filling materials preferably
include calcium carbonate. The mass content of the filling
materials in the mixed pulp is preferably 8-20%, more preferably
10-15% and most preferably 12-14%.
[0038] In the present invention, the mass concentration of the
mixed pulp is preferably 0.1-1.0% and more preferably 0.5%.
[0039] The obtained mixed pulp is subjected to a papermaking
process in the paper machine in the present invention to obtain
tobacco sheets.
[0040] In the present invention, the retention agent added during
the paper making process in the paper machine preferably includes
cationic guar gum or chitosan. The mass ratio of the retention
agent to the mixed pulp is preferably (0.05-0.3%):1, more
preferably (0.1-0.25%):1 and most preferably (0.15-0.2%):1.
[0041] The present invention imposes no specific limitation on the
implementation of the papermaking process in the paper machine in
the present invention, and any papermaking mode in the paper
machine well known by those skilled in the art may be adopted.
[0042] The technical scheme in the present invention will now be
described clearly and fully detailed with reference to the
following preferred embodiments in the present invention.
Preferred Embodiment 1
[0043] 10 kg of tobacco stem materials and 2 kg of aqueous sodium
hydroxide solution (50% mass concentration) are added with water to
make the solid-liquid mass ratio in the reaction system be 1:5,
wherein the cooking conditions are 170.degree. C. for 3 h. After
cooking, the cooked aqueous pulp is filtered and the filter cakes
are washed with water to obtain tobacco stem fibers.
[0044] The mixed pulp is prepared as per certain mass proportions:
100 parts of tobacco pulp (10% mass concentration), 20 parts of
wood pulp fibers, 0.5 parts of tobacco stem fibers, and 15 parts
calcium carbonate; and a 0.5% mass concentration of the mixed pulp
is obtained by adding water. Tobacco sheets are obtained by
papermaking process in the paper machine. Cationic guar gum is
added as a retention agent during the papermaking process.
[0045] FIG. 1 shows a scanning electron microscope picture of the
tobacco stem fibers after being cooked in an aqueous sodium
hydroxide solution.
Preferred Embodiment 2
[0046] Testing is conducted according to the method in preferred
embodiment 1, except that there are 1.0 parts of tobacco stem
fibers utilized in the mixed pulp preparation, not 0.5 parts as
specified in preferred embodiment 1.
Preferred Embodiment 3
[0047] Testing is conducted according to the method in preferred
embodiment 1, except that there are 2.0 parts of tobacco stem
fibers utilized in the mixed pulp preparation, not 0.5 parts as
specified in preferred embodiment 1.
Preferred Embodiment 4
[0048] Testing is conducted according to the method in preferred
embodiment 1, except that there are 4.0 parts of tobacco stem
fibers utilized in the mixed pulp preparation, not 0.5 parts as
specified in preferred embodiment 1.
REFERENCE EXAMPLE 1
[0049] Testing is conducted according to the method in preferred
embodiment 1, except that 0 parts of tobacco stem fibers and 25
parts of wood pulp fibers are utilized in the mixed pulp
preparation, not 0.5 parts and 20 parts, as specified in preferred
embodiment 1, respectively.
REFERENCE EXAMPLE 2
[0050] Testing is conducted according to the method in preferred
embodiment 1, except that 0 parts of tobacco stem fibers are
utilized in the mixed pulp preparation, not 0.5 parts as specified
in preferred embodiment 1, respectively.
[0051] The strength of the tobacco sheets prepared respectively by
embodiments 1-4 and reference examples 1-2 is tested, with the test
results shown in Table 1:
TABLE-US-00001 TABLE 1 Effects of quantity of tobacco stem fibers
on physical properties of tobacco sheets Reference Reference
Embodiment Embodiment Embodiment Embodiment example 1 example 2 1 2
3 4 Wood pulp fibers 25 parts 20 parts Tobacco stem fibers 0 0 0.5
part 1.0 part 2.0 parts 4.0 parts Bulk (cm.sup.3/g) 2.04 2.06 2.10
2.11 2.07 2.03 Tensile index (N m/g) 11.18 10.20 10.32 11.77 12.80
13.89
[0052] As can be seen from the test results in Table 1, the present
invention effectively reduces the quantity of wood pulp fibers and
improves the bulk and tensile index (after 1.0 part) of the tobacco
sheets by adding tobacco stem fibers.
Preferred Embodiment 5
[0053] Testing is conducted according to the method in preferred
embodiment 1, except that 16 parts of wood pulp fibers, and 0.5
parts, 1.0 parts, and 2.0 parts of the tobacco stem fibers are
utilized in the mixed pulp preparation, respectively. The physical
properties of the tobacco sheets obtained by adding different
amounts of tobacco stem fibers are tested respectively, with the
test results shown in Table 2.
REFERENCE EXAMPLE 3
[0054] Testing is conducted according to the method in preferred
embodiment 5, with the distinction that no tobacco stem fibers are
added. The physical properties of the resulting tobacco sheets are
tested, with the test results shown in Table 2.
TABLE-US-00002 TABLE 2 Effects of the quantity of tobacco stem
fibers on physical properties of tobacco sheets Reference example 3
Embodiment 5 Quantity of wood pulp 16 parts fibers Quantity of
tobacco stem 0 0.5 part 1.0 part 2.0 parts 4.0 parts fibers Bulk
(cm.sup.3/g) 2.09 2.07 2.13 2.17 2.16 Tensile index (N m/g) 9.09
9.31 11.12 11.43 12.69
[0055] As can be seen from Table 2, the present invention
effectively improves the bulk (after 1.0 part) and tensile index of
the prepared tobacco sheets by adding tobacco stem fibers.
Preferred Embodiment 6
[0056] Testing is conducted according to the method in preferred
embodiment 1, except that 12 parts of wood pulp fibers and 2.0
parts, 4.0 parts, 6.0 parts, and 8.0 parts of tobacco stem fibers
are utilized, respectively, in the mixed pulp preparation. The
physical properties of the tobacco sheets obtained by adding
different amounts of tobacco stem fibers are tested respectively,
with the test results shown in Table 3.
REFERENCE EXAMPLE 4
[0057] Testing is conducted according to the method in preferred
embodiment 6, with the distinction that no tobacco stem fibers are
added. The physical properties of the resulting tobacco sheets are
tested, with the test results shown in Table 3.
TABLE-US-00003 TABLE 3 Effects of the quantity of tobacco stem
fibers on physical properties of tobacco sheets Reference example 4
Embodiment 6 Quantity of wood pulp 12 parts fibers Quantity of
tobacco stem 0 2.0 parts 4.0 parts 6.0 parts 8.0 parts fibers Bulk
(cm.sup.3/g) 2.14 2.10 2.18 2.17 2.16 Tensile index (N m/g) 8.37
9.88 10.69 11.78 12.95
[0058] As can be seen from Table 3, the present invention
effectively improves the bulk (after 4.0 part) and tensile index of
the finally-prepared tobacco sheets by adding tobacco stem
fibers.
[0059] As evidenced by the above mentioned preferred embodiments,
by adding tobacco stem fibers the present invention effectively
reduces the quantity of wood pulp fibers, ensuring the continuous
operation of the paper machine and effectively improving the bulk
and tensile index of prepared tobacco sheets. Furthermore, by
reducing the quantity of wood pulp fibers, the present invention
improves the flavor of tobacco, effectively relieving the negative
effect of excessive wood pulp fibers on the flavor of tobacco.
[0060] The foregoing descriptions are only preferred embodiments of
the present invention. It should be noted that for one ordinary
skilled in the art, several improvements and modifications may
further be made without departing from the principle of the present
invention. These improvements and modifications should also be
deemed as falling within the protection scope of the present
invention.
* * * * *