JP4662252B2 - Unryu paper and manufacturing method thereof - Google Patents

Description

  The present invention relates to a cloud dragon paper manufactured by a wet paper machine and a method for manufacturing the same.

  Unryu paper is a pattern paper manufactured by hand-drawing or machine-making by mixing a base material composed of cellulose fibers and the like and agglomerated fibers such as rayon fibers and grooves.

Conventionally, methods for aggregating rayon fibers, cellulose fibers and the like and methods for adding the aggregates have been proposed as methods for increasing the grace of paper appearance.
In particular, rayon fiber has been frequently used as a pattern raw material for Yunlong paper. This rayon fiber is rich in hydrophilicity compared to synthetic fibers and has high papermaking suitability, and high gloss is obtained compared to other cellulosic pulps such as N-BKP.

  Furthermore, as described in "All Paper Guide-Paper Product Dictionary" (Paper Industry Times, issued December 1, 1983), to obtain "long fiber decorations that twist in various directions" From the viewpoint of cost, it can be said that the rayon fiber is the most suitable fiber at present.

  Examples of patent documents disclosing pattern paper in which rayon fibers are aggregated or in which rayon fibers are aggregated together with other fibers include the following.

  In Japanese Patent Publication No. 44-28844, there is a pattern in which a crimped acetate rayon having a fineness of 2.2 to 5.6 dtex and a fiber length of 0.5 to 30 mm is disaggregated with a paper beater or a stirrer. Patterned paper produced by mixing or combining with cellulose fibers has been proposed.

  However, since the flocculant is not added in this method, the size of the pattern changes depending on the stirring time and the stirring speed, so that the size of the resulting pattern becomes unstable and a spherical pattern due to entanglement occurs. However, it becomes unsuitable as a pattern of Unryu paper.

  In addition, Japanese Utility Model Publication No. 45-15608 proposes a pattern paper in which a spherical aggregate formed by stirring rayon staple having a fineness of 11 dtex or less and a fiber length of 1 to 10 mm is mixed with other paper fibers. However, in the case of this method, as in the case of the above method, the generated pattern is not suitable as a cloud dragon paper pattern.

  Furthermore, in Japanese Patent Application Laid-Open No. 2003-293285, it is desirable that an anion be used for rayon fibers (dispersion concentration in water of 0.8 wt% or more, absolute dry weight) having a fineness of 0.8 to 3 dtex and a fiber length of 3 to 10 mm. A rayon fiber agglomerate produced by adding 1 to 5% active ingredient (vs. dry weight of rayon fiber) alone of a coagulant based on acrylic acid copolymer type was added to 20 parts per 100 parts of pulp slurry. A rayon mixed paper is proposed in which the paper is mixed at a ratio and the mixed paper and natural pulp paper are combined.

  However, with this method, the desired pattern cannot be obtained.

  Japanese Patent Laid-Open No. 52-21408 is another prior application example in which an agglomerate produced by adding a flocculant is added to a pattern paper as disclosed in Japanese Patent Laid-Open No. 2003-293285. There, the length of 1 to 8 mm and the width of 0.1 to 5 mm are obtained by using a cationic polymer substance as a medium and depositing an anionic emulsion in pulp having a beating degree of 300 to 670 ml. There has been proposed a method of making paper by mixing agglomerates.

  However, such a pulp agglomerate has a small pattern, and a Yunlong paper that is satisfactory in terms of gloss and pattern size as in the case of using rayon fibers cannot be obtained.

  As described above, there is currently proposed a method for producing Yunlong paper that can adjust the size of the pattern to the desired size within a certain range without impairing the appearance of Yunlong paper. The appearance of such a manufacturing method has been eagerly desired.

Japanese Patent Publication No. 44-28844 Japanese Utility Model Publication No. 45-15608 JP 2003-293285 A Japanese Patent Laid-Open No. 52-21408

  The present invention has been made to meet the above-mentioned demand, and can adjust the size of the cloud dragon paper pattern, and can further suppress the generation of a large block pattern that is not preferable as a pattern. It is an object of the present invention to provide a new Yunlong paper and a method for producing the same.

The cloud dragon paper according to claim 1 for solving the above-mentioned problem is a cloud dragon paper having a pattern mainly composed of rayon fibers , wherein the pattern has a fineness of 1.7 to 5.6 dtex and a fiber length of 10 to 30 mm. The rayon fiber was added to the rayon fiber with a cationic flocculant as a solid content weight of 2.0 to 7.0% of the absolute dry weight of the rayon fiber, and the anionic flocculant as a solid content weight with respect to the rayon fiber. Add 0.5% to 4.7% of fiber dry weight, and add so that the solid weight addition ratio of both flocculants is in the range of cationic flocculant: anionic flocculant = 60-80: 40-20 It is characterized by being aggregated .

The pattern raw material and the base raw material composed of the cellulosic raw material can be blended at a ratio of 1:16 to 4:13 in an absolutely dry weight ratio for paper making.

The method for producing the Yunlong paper according to Claim 3 for producing the Yunlong paper according to Claim 1 comprises: a rayon having a fineness in the range of 1.7 to 5.6 dtex and a fiber length in the range of 10 to 30 mm. The fibers were adjusted to a water dispersion concentration in the range of 0.1 to 0.5% (absolute dry weight), and a certain range of cationic flocculant and anionic flocculant were added to the rayon slurry, A method for producing Yunlong paper, which produces agglomerates of rayon fibers, continuously supplies a certain amount of the rayon floc to a wet paper machine, and mixes with another base material to produce paper. The solid content weight addition amount of the anionic flocculant is 2.0 to 7.0% with respect to the rayon fiber absolute dry weight with respect to the rayon fiber, and the solid content weight addition amount with respect to the rayon fiber is 0.5 to 4. It is characterized by 7% .

Solids weight addition ratio of the anionic flocculant and the cationic flocculant is a cationic flocculant: anionic flocculant = 60-80: in the range of 40 to 20, also the base material and the pattern material for Are blended at a ratio of 1:16 to 4:13 in an absolutely dry weight ratio .

  According to the present invention, the size of the cloud dragon paper pattern can be arbitrarily adjusted within a certain range of variation.

Hereinafter, preferred embodiments of the cloud dragon paper and the manufacturing method thereof according to the present invention will be described. The cloud dragon paper according to the present invention is a cloud dragon paper having a pattern mainly composed of rayon fibers, and the pattern uses rayon fibers having a fineness of 1.7 to 5.6 dtex and a fiber length of 10 to 30 mm. In addition to adding 2.0 to 7.0% of the dry weight of the rayon fiber as a solid weight to the cationic flocculant, the dry weight of the rayon fiber as a solid weight of 0.5 to 4 And 7% added, and added and agglomerated so that the solid content weight addition ratio of both coagulants is in the range of cationic coagulant: anionic coagulant = 60-80: 40-20. Which comprises 0.1 to 0.5% (absolutely dry weight) of rayon fibers having a fineness in the range of 1.7 to 5.6 dtex and a fiber length in the range of 10 to 30 mm. Adjust the water dispersion concentration in the range of A cationic flocculant and an anionic flocculant in a certain range are added to the slurry of rayon to form an aggregate of the rayon fiber, and the rayon floc is continuously supplied to the wet paper machine by a constant amount. A method for producing Yunlong paper, which is mixed with a raw material to make paper, wherein the cationic flocculant has a solid content weight addition amount of 2.0 to 7.0% of the dry weight of rayon fiber, and the anionic property. The solid content weight addition amount of the flocculant can be produced by a method characterized in that the dry weight with respect to rayon fiber is 0.5 to 4.7% .

Next, details of the manufacturing method will be described for each process.
Next, details of the manufacturing method will be described for each process.
(1) Prepare rayon fibers having a fineness of 1.7 to 5.6 dtex and a fiber length of 10 to 30 mm, and adjust the water dispersion concentration to 0.1 to 0.5% (absolute dry weight) using a fiber disaggregator. To do.
(2) The cationic flocculant as a solid content weight with respect to the rayon slurry thus adjusted is 2.0 to 7.0%, more preferably 4.0 to 6.0% (vs. dry weight of rayon fiber),
Further, an anionic flocculant is added in an amount of 0.5 to 4.7%, more preferably 1.9 to 2.9% (absolute dry weight with respect to rayon fiber) as a solid weight, and agglomerated to obtain rayon floc.

(3) A certain amount of the rayon frock is continuously supplied to the circular net vat and mixed with the base material, which is a cellulosic pulp material, to make paper. A certain amount of rayon flock is continuously supplied to the wet paper machine so that the ratio of rayon flock to the base material is 1:16 to 4:13 (absolute dry weight ratio).
If the fineness and fiber length of the rayon fiber to be agglomerated are within the above ranges, it is possible to use two or more types of rayon fiber.

  Through the above steps, the average value of the maximum width of 500 patterns having a maximum width of 0.5 mm or more measured in order according to the machine flow direction of the paper is 1.0 mm to 2.0 mm, and the average value of the length is also the same. Cloud dragon paper having a pattern mainly composed of rayon fibers in the range of 40 mm to 60 mm is obtained.

  When the fiber length of the rayon fiber is less than 10 mm, the length of the pattern is shortened, and when the fiber length is longer than 30 mm, excessive fiber entanglement occurs, and a large lump that is undesirable in appearance is generated. .

  If the fineness of the rayon fiber is less than 1.7 dtex, the rigidity of the fiber becomes low, so that excessive bending of the pattern occurs to impair the appearance, and if it is thicker than 5.6 dtex, the rigidity becomes too high and irregular. A pattern with undulations cannot be obtained, which makes it unsuitable as a cloud dragon paper pattern.

  If the water dispersion concentration of the rayon fiber in the disaggregator is less than 0.1% (absolutely dry weight), the concentration is too thin, and the entanglement between the rayon fibers becomes insufficient, and a pattern of a desired size is obtained. Absent. On the other hand, if the water dispersion concentration of the rayon fiber in the disaggregator is higher than 0.5% (absolute dry weight), the concentration is too high and excessive entanglement occurs, and a large lump that is undesirable in appearance is generated.

  The addition ratio of the cationic and anionic flocculants must be in the range of cationic flocculant: anionic flocculant = 60-80: 40-20 in the solid content weight ratio. Either of the added flocculants becomes surplus and disadvantageous in cost, and the flocculant itself is likely to cause troubles in papermaking such as aggregation.

  In the above addition ratio, if the solid content addition ratio of the cationic flocculant is lower than 2.0% (vs. dry weight with respect to rayon fiber), the pattern cohesiveness is insufficient, and a pattern having a desired size cannot be obtained. . On the other hand, when the solid content addition rate is higher than 7.0% (vs. dry weight of rayon fiber), excessive aggregation occurs, and a large lump that is undesirable in appearance is generated.

  Therefore, the solid content addition ratio of the anionic flocculant in the present invention is 0.5 to 4.7% (vs. dry weight of rayon fiber).

  Although it does not specifically limit as a cationic flocculant, Cationic polyacrylamide type resin, cationic styrene type resin, etc. are used. The anionic flocculant is not particularly limited, and an anionic polyacrylamide resin or the like is used.

  If the blending ratio of the rayon flock and the base material is less than 1:16 (absolute dry weight ratio), the pattern becomes too small, which is not preferable. On the other hand, if the blending ratio of the rayon flock and the base material is larger than 4:13 (absolute dry weight ratio), too many patterns are formed and the patterns are tangled with each other at the time of papermaking.

  As for the size of the pattern, the average value of the maximum width of 500 patterns having a maximum width of 0.5 mm or more measured in order according to the machine flow direction of the paper is 1.0 to 2.0 mm, and the average value of the length is also the same. It becomes possible to adjust in the range of 40-60 mm.

  The present invention will be specifically described with reference to the following examples and comparative examples, but it is needless to say that the present invention is not limited to these examples.

[Example 1]
A rayon fiber (3.3 dtex, fiber length 20 mm and 25 mm, blending ratio 20 mm: 25 mm = 65: 35) manufactured by Daiwabo Rayon Co., Ltd. is charged into the disaggregator, and the water dispersion concentration of the rayon fiber is reduced to 0 while circulating disintegration and water injection Adjusted to 2%. Next, a cationic styrene-based resin (“Serafix ST” manufactured by Meisei Chemical Co., Ltd.) is added to the circulating rayon fiber slurry as a solid content at 5.0% (vs. dry weight of rayon fiber), and further, Anionic polyacrylamide resin (“FIREX M” manufactured by Meisei Chemical Co., Ltd.) was added as a solid content of 2.4% (vs. dry weight of rayon fiber), stirred for several minutes, the disaggregator was stopped, and rayon was stopped. A floc was formed, and the rayon floc slurry was transferred to another raw chest.

Next, as the base material, the above rayon floc slurry is completely separated from a cellulosic material slurry (N-BKP 70%, rayon fiber 3.3 dtex × 5 mm 25%, PVA binder fiber 5%, each in an absolutely dry weight ratio). A constant amount was continuously supplied from the raw material chest to the bat of the wet circular net paper machine so that the dry weight ratio was 15: 2, and the mixture was mixed to obtain 17 g / m ² of Yunlong paper.

[Example 2]
The solid content addition rate of the cationic styrenic resin was 6.0% (vs. dry ray fiber absolute dry weight, the same applies hereinafter), and the solid content addition rate of the anionic polyacrylamide resin was 2.8%. Was made in the same manner as in Example 1.

[Example 3]
Papermaking was carried out in the same manner as in Example 1 except that the solid content addition rate of the cationic styrene resin was 4.0% and the solid content addition rate of the anionic polyacrylamide resin was 2.0%. did.

[Example 4]
Papermaking was performed in the same manner as in Example 1 except that the blending ratio of the pattern rayon fiber was 20 mm: 25 mm = 100: 0.

[Example 5]
Papermaking was performed in the same manner as in Example 4 except that the solid content addition rate of the cationic styrene resin was 2.0% and the solid content addition rate of the anionic polyacrylamide resin was 0.7%. did.

[Comparative Example 1]
Papermaking was carried out in the same manner as in Example 1 except that the blending ratio of the pattern rayon fiber was 20 mm: 25 mm = 100: 0 and no flocculant was used.

[Comparative Example 2]
Papermaking was performed in the same manner as in Example 1 except that the solid content addition rate of the cationic styrene resin was 8.0% and the solid content addition rate of the anionic polyacrylamide resin was 3.8%. Carried out.

[Comparative Example 3]
Papermaking was carried out in the same manner as in Example 1 except that the solid content addition ratio of the cationic styrene resin was 1.0% and the solid content addition ratio of the anionic polyacrylamide resin was 0.5%. Carried out.

Measuring method of maximum width: The maximum width of 500 patterns having a maximum width of 0.5 mm or more was totaled and obtained from the average value.
Length measuring method: The lengths of the 500 patterns were tabulated and the average value was obtained.
The number of fiber lumps: The 1000 m flow direction of the cloud dragon paper was observed, and the number of fiber lumps undesirable as cloud dragon paper generated by the tangle of fibers was counted.

表中、模様の最大幅（太さ）と長さの評価を次のように総合評価した。
◎…最良、○…良、△…○と×の中間、×…不十分

In the table, the maximum width (thickness) and length of the pattern were evaluated as follows.
◎… Best, ○… Good, △… Intermediate between ○ and ×, ×… Insufficient

  In Examples 1 to 5, it was possible to adjust the size of the pattern within the range intended by the present invention while suppressing the generation of fiber lumps that were not preferable in appearance.

In Comparative Example 1, both the thickness and length of the pattern were determined to be insufficient.
In Comparative Example 2, agglomeration was too strong and a large number of fiber lumps undesirable in appearance were generated.
In Comparative Example 3, it was determined that the aggregation was too weak and the thickness of the pattern was insufficient.

  Although the present invention has been described in some detail with respect to its most preferred embodiments, it will be apparent that a wide variety of different embodiments can be constructed without departing from the spirit and scope of the invention, the invention being defined by the appended claims. It is not restricted to the specific embodiment other than limiting in.

Claims (5)

A cloud dragon paper having a pattern mainly composed of rayon fibers , wherein the pattern uses rayon fibers having a fineness of 1.7 to 5.6 dtex and a fiber length of 10 to 30 mm, and a cationic flocculant is added to the rayon fibers. A 2.0% to 7.0% dry weight of rayon fiber is added as a solid content weight, and an anionic flocculant is added to a dry weight of 0.5% to 4.7% of rayon fiber as a solid weight. A cloud dragon paper, characterized in that the flocculant is added and agglomerated so that the solid content weight addition ratio of the flocculant is in the range of cationic flocculant: anionic flocculant = 60-80: 40-20 .   The Yunlong paper according to claim 1, wherein the pattern raw material and a base raw material composed of cellulosic raw material are blended and made in a ratio of 1:16 to 4:13 in an absolute dry weight ratio. A rayon fiber having a fineness in the range of 1.7 to 5.6 dtex and a fiber length in the range of 10 to 30 mm is adjusted to an aqueous dispersion concentration in the range of 0.1 to 0.5% (absolutely dry weight) , to rayon slurry was added a cationic flocculant and anionic flocculant a range, the generating aggregates of rayon fibers, continuous fixed amount supply the rayon flock to wet paper making machine, a separate A method for producing Yunlong paper that is mixed with a base material to make paper,
The cationic flocculant has a solid content weight addition amount of 2.0 to 7.0% of the absolute dry weight of rayon fiber, and the anionic flocculant has a solid content weight addition amount of 0 to the absolute weight of rayon fiber. A method for producing Yunlong paper, characterized in that it is 5 to 4.7% .   The solid content weight addition ratio of the cationic flocculant and the anionic flocculant is in the range of cationic flocculant: anionic flocculant = 60-80: 40-20. Production method.   4. The method for producing Yunlong paper according to claim 3, wherein the pattern raw material and the base raw material are blended at a ratio of 1:16 to 4:13 in an absolutely dry weight ratio.