TWI768833B - Method for packaging and transportation of cellulosic polymer, and package of cellulosic polymer - Google Patents

Abstract

An object of the present invention is to provide a packaging method suitable for transportation and the like of a cellulose polymer, and a further object is to provide a packaging method suitable for transportation while suppressing a decrease in the viscosity of the cellulose polymer. In the present invention, the cellulose polymer is packaged so as to satisfy the following conditions (1), (2) and (3). Condition (1): The aforementioned packaging bag having gas barrier properties is filled with a cellulose polymer. Condition (2): The oxygen concentration in the packaging bag was adjusted to 0.8% or less and sealed. Condition (3): When the packaging bag filled with the cellulose polymer is installed so that the longest long side L is horizontal, the depth D of the packaging bag from the horizontal installation surface and the long side L satisfy the relational expression: 6.1≦L/ D≦10. Moreover, it is suitable that the static friction coefficient of the outermost surface of the packaging bag satisfies the range of 0.2 to 0.5 and the dynamic friction coefficient satisfies the range of 0.15 to 0.35.

Description

Methods of packaging and transporting cellulose polymers and packaging of cellulose polymers

The present invention relates to a method of packaging cellulose polymers and their applications.

Polymers derived from cellulose such as hydroxyethyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, and hydroxypropyl cellulose are used in various fields such as medical treatment and food because of their high safety. For example, carboxymethyl cellulose is used as a viscosity enhancer and emulsion stabilizer for foods such as ice cream, and is also used in non-food products such as toothpaste, laxatives, slimming lozenges, water-based inks, surfactants, and paper products.

Conventionally, cellulose polymers are generally stored in a powder state. However, the viscosity of the cellulose polymer solution after long-term storage is significantly lower than the viscosity of the cellulose polymer solution before storage, and there is a problem that it cannot function as a viscosity modifier.

Therefore, Patent Document 1 proposes a storage method for suppressing a reduction in viscosity due to oxidation or the like by keeping the oxygen concentration in the packaging bag at a fixed value or less. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2012-121957

[The problem to be solved by the invention]

However, in Patent Document 1, in order to minimize the decrease in viscosity, a method of reducing the residual oxygen concentration in the packaging bag by nitrogen substitution is proposed. There is a problem that it is difficult to pack or stack the packaging bags on each other during transportation.

In view of the above situation, one of the problems to be solved is to provide a packaging method suitable for transportation and the like of cellulose polymers. Furthermore, another problem to be solved is to provide a packaging method which is more suitable for transportation and the like while suppressing the decrease in the viscosity of the cellulose polymer. [Means to solve the problem]

The invention proposed in the present disclosure comprehends various aspects, and includes, for example, the following contents as means for solving the problems. That is, the present invention is the following [1] to [20].

[1] A method for packaging a cellulose polymer, comprising filling a packaging bag with gas barrier properties with a cellulose polymer, and sealing the packaging bag. [2] The method for packaging a cellulose polymer according to the above [1], which satisfies the following conditions (1) to (3). Condition (1): The aforementioned packaging bag having gas barrier properties is filled with a cellulose polymer. Condition (2): The oxygen concentration in the packaging bag was adjusted to 0.8% or less and sealed. Condition (3): When the packaging bag filled with cellulose polymer is installed so that the longest long side L becomes horizontal, the depth D of the packaging bag from the horizontal plane and the long side L satisfy the relational expression of 6.1≦L/D≦10 . [3] The method for packaging a cellulose polymer according to the above [1] or [2], wherein the longest side L of the packaging bag filled with the cellulose polymer is 700 mm or more and 1100 mm or less. [4] The method for packaging a cellulose polymer according to any one of the above [1] to [3], wherein the short side W perpendicular to the long side L in the packaging bag filled with the cellulose polymer is 400 mm or more And less than 700mm. [5] The method for packaging a cellulose polymer according to any one of the above [1] to [4], wherein the depth D of the packaging bag filled with the cellulose polymer is less than 130 mm. [6] The method for packaging a cellulose polymer according to any one of the above [1] to [5], wherein the outermost layer surface has a static friction coefficient of 0.2 to 0.5 and a dynamic friction coefficient of 0.15 to 0.35 with a gas in the range The barrier properties of the aforementioned packaging bags are filled with cellulose polymers. [7] The method for packaging a cellulose polymer according to the above [6], wherein the smoothness of the outermost layer of the packaging bag satisfies the range of 2 to 10 seconds. [8] The method for packaging a cellulose polymer according to the above [6] or [7], wherein the outermost layer of the packaging bag is a paper base material. [9] The method for packaging a cellulose polymer according to any one of the above [6] to [8], wherein the outermost layer of the packaging bag satisfies the range of a basis weight of 50 to 100 g/m ² . [10] The method for packaging a cellulose polymer according to any one of the above [1] to [9], wherein the cellulose polymer is carboxymethyl cellulose. [11] The method for packaging a cellulose polymer according to any one of the above [1] to [10], wherein the inside of the packaging bag is subjected to vacuum treatment, followed by nitrogen substitution to adjust the oxygen concentration to 0.8% or less. [12] The method for packaging a cellulose polymer according to any one of the above [1] to [11], wherein the internal pressure in the packaging bag is 85 KPa or less. [13] A method for transporting a cellulose polymer, comprising laminating and transporting the packaging bags obtained by the method for packaging a cellulose polymer according to any one of the above [1] to [12] to a destination. [14] The method for transporting a cellulose polymer according to the above [13], wherein the packaging bag is in a stacked state of two or more layers and no more than 10 layers. [15] A cellulose polymer package, comprising a sealed packaging bag and a cellulose polymer filled in the packaging bag, and satisfying the following conditions (1) to (3): Condition (1): The cellulose polymer is filled in the packaging bag having gas barrier properties; Condition (2): The oxygen concentration in the packaging bag is adjusted to 0.8% or less and sealed; Condition (3): The cellulose polymer is filled When the packaging bag is installed so that the longest long side L is horizontal, the depth D of the packaging bag from the horizontal plane and the long side L satisfy the relational expression of 6.1≦L/D≦10. [16] The cellulose polymer packaging according to the above [15], wherein the packaging bag satisfies the range of the static friction coefficient of the outermost layer surface of 0.2 to 0.5 and the dynamic friction coefficient of 0.15 to 0.35. [17] The cellulose polymer package according to the above [15] or [16], wherein the cellulose polymer is carboxymethyl cellulose. [18] The cellulose polymer package according to any one of the above [15] to [17], wherein the oxygen concentration in the packaging bag is more than 0.3% and 0.8% or less. [19] The cellulose polymer package according to any one of the above [15] to [18], wherein the internal pressure in the packaging bag is 85 KPa or less. [20] The cellulose polymer packaging according to any one of the above [15] to [19], wherein the packaging bag has a layer structure of two or more layers, and the outermost layer of the packaging bag is a paper base material , at least one of the inner bag layers located on the inner side of the outermost layer is a gas barrier layer. [Effect of invention]

According to one aspect of the present invention, a packaging method suitable for transportation and the like of cellulosic polymers can be provided. Furthermore, according to one aspect of the present invention, a packaging method suitable for transporting a cellulose polymer and the like can be provided while suppressing a decrease in the viscosity of a cellulose polymer. Furthermore, according to an aspect of this invention, the package of the cellulose polymer suitable for transportation etc. can be provided. Furthermore, according to one aspect of the present invention, it is possible to provide a package suitable for transportation and the like of a cellulose polymer while suppressing a decrease in the viscosity of a cellulose polymer.

Embodiments of the present invention will be described below. In addition, unless otherwise specified in the present disclosure, descriptions such as "AA to BB" mean "AA or more and BB or less" (here, "AA" and "BB" represent arbitrary numerical values) about the numerical range. In addition, the units of the lower limit and the upper limit are the same as the units attached to the immediate back of the latter (that is, "BB" here) unless otherwise specified. In addition, in the present disclosure, the expression "X and/or Y" refers to both X and Y or any one of them. In addition, unless otherwise specified in the present disclosure, the gas concentration is represented by a volume ratio. For example, the unit "%" of the oxygen concentration represents the percentage of the volume ratio (Vol/Vol) of oxygen. 1. The first embodiment of the present invention

One embodiment of the present invention provides a method for packaging a cellulose polymer, which comprises filling a packaging bag with gas barrier properties with a cellulose polymer, and sealing the packaging bag, which satisfies the following condition (1) ~(3) (hereinafter referred to as the first embodiment). Condition (1): A cellulose polymer is filled in a packaging bag with gas barrier properties. Condition (2): The oxygen concentration in the packaging bag was adjusted to be 0.8% or less and sealed. Condition (3): When the packaging bag filled with cellulose polymer is installed so that the longest long side L becomes horizontal, the depth D and long side L of the packaging bag from the horizontal installation surface (horizontal surface) satisfy 6.1≦L/D≦6.1≦L/D≦ 10 relationship. ＜Cellulose polymer＞

In the first embodiment of the present invention, the cellulose polymer is not particularly limited as long as it is a compound derived from cellulose, but it is preferably chemically modified. Such chemical modification involves introducing functional groups into pulp, The chemical modification is preferably anionic modification, that is, the chemically modified cellulose preferably has an anionic group. Examples of the anionic group include acid groups such as a carboxyl group, a carboxyl group-containing group, a phosphoric acid group, a phosphoric acid group-containing group, and a sulfate group. Examples of the carboxyl group-containing group include -COOH group, -R-COOH (R is an alkylene group having 1 to 3 carbon atoms), and -O-R-COOH (R is an alkylene group having 1 to 3 carbon atoms). Examples of the phosphoric acid group-containing group include a polyphosphoric acid group, a phosphorous acid group, a phosphonic acid group, a polyphosphonic acid group, and the like. These acid groups are also introduced in the form of salts (eg, carboxylate groups (-COOM, M is a metal atom)) depending on the reaction conditions. In the present invention, the chemical modification is preferably oxidation or etherification.

Oxidation can be carried out in a known manner. For example, a method of oxidizing raw pulp in water using an oxidizing agent in the presence of a substance selected from the group consisting of N-oxyl compounds, bromides, iodides, and mixtures thereof can be exemplified. According to this method, the primary hydroxyl group at the C6 position of the glucopyranose ring on the cellulose surface is selectively oxidized to generate a group selected from the group consisting of an aldehyde group, a carboxyl group, and a carboxylate group. Or an ozone oxidation method can be mentioned. According to this oxidation reaction, at least the hydroxyl groups at the 2-position and the 6-position of the glucopyranose ring constituting the cellulose are oxidized and the cellulose chain is decomposed.

Examples of etherification include: carboxymethyl (ether), methyl (ether), ethyl (ether), cyanoethyl (ether), hydroxyethyl (ether), hydroxypropyl ( ether), ethyl hydroxyethyl (ether), hydroxypropyl methyl (ether), etc. Among them, carboxymethylation is preferred. The carboxymethylation can be carried out, for example, by a method of mercerizing a raw material pulp as a starting material, followed by etherification. Among them, carboxymethylated cellulose can prevent the viscosity from decreasing as an aqueous solution, and can be used as a packaging bag suitable for transportation and the like.

Such carboxymethylated cellulose can generally be produced by the following method: after treating cellulose with alkali (mercerization), the obtained mercerized cellulose (also referred to as alkali cellulose) and carboxymethylated agent (also known as etherifying agent) reaction.

In the first embodiment of the present invention, cellulose refers to a polysaccharide in which D-glucopyranose (also simply referred to as "glucose residue" and "anhydroglucose") is linked by β-1,4 bonds. Cellulose is generally classified into natural cellulose, regenerated cellulose, fine cellulose, microcrystalline cellulose from which non-crystalline regions have been removed, and the like by origin, production method, and the like. In the present invention, all of these celluloses can be used as raw materials for mercerized cellulose.

Examples of natural cellulose include bleached pulp or unbleached pulp (bleached wood pulp or unbleached wood pulp); cotton lint, refined cotton lint; cellulose produced by microorganisms such as acetic acid bacteria, and the like. The raw material of bleached pulp or unbleached pulp is not particularly limited, and examples thereof include wood, kapok, straw, bamboo, hemp, jute, and kenaf. Moreover, the manufacturing method of a bleached pulp or an unbleached pulp is not specifically limited, A mechanical method, a chemical method, or the method which combined both of them may be sufficient. Examples of bleached pulp or unbleached pulp classified according to the production method include mechanical pulp (thermomechanical pulp (TMP), ground wood pulp), chemical pulp (conifer unbleached sulfite pulp (NUSP), conifer bleached sulfite pulp Sulfurous pulp such as kraft pulp (NBSP), coniferous unbleached kraft (kraft) pulp (NUKP), coniferous bleached kraft pulp (NBKP), broadleaf unbleached kraft pulp (LUKP), broadleaf bleached kraft pulp (LBKP) ) etc. Kraft pulp) etc. In addition, dissolving pulp may be used other than pulp for papermaking. Dissolving pulp is chemically refined pulp, which is mainly dissolved in chemicals for use, and is the main raw material of rayon, cellophane, and the like.

The carboxymethyl substitution degree per unit of anhydrous glucose of carboxymethylated cellulose is preferably in the range of 0.2 to 1.5, more preferably in the range of 0.3 to 1.2, and even more preferably in the range of 0.5 to 1.0. If the carboxymethyl substitution degree is less than 0.2, when the carboxymethylated cellulose is used as an aqueous solution, the viscosity of the carboxymethyl cellulose is less likely to be exhibited, and the effect of the present invention is limited. When the carboxymethyl substitution degree exceeds 1.5, the viscosity is likely to decrease even in the packaging method of the present invention, which is not suitable.

In addition, the anhydrous glucose unit in the 1st aspect of this invention refers to each anhydrous glucose (glucose residue) which comprises cellulose. Also, the degree of carboxymethyl substitution (also called the degree of etherification) refers to the ratio of the hydroxyl groups in the glucose residues constituting cellulose that are substituted with carboxymethyl ether groups (carboxymethyl ether groups per glucose residue). quantity). In addition, the carboxymethyl substitution degree may be abbreviated as DS in some cases.

The measurement method of the degree of carboxymethyl substitution is as follows: Precisely weigh about 2.0 g of the sample and put it into a 300 mL conical flask with a stopper. Add 100 mL of a liquid containing 100 mL of super concentrated nitric acid to 1000 mL of methanol, and shake for 3 hours to convert the salt of carboxymethyl cellulose (CMC) into H-CMC (hydrogen carboxymethyl cellulose). 1.5-2.0 g of this extremely dry H-CMC was precisely weighed and put into a 300 mL conical flask with a stopper. Wet H-CMC with 15 mL of 80% methanol, add 100 mL of 0.1 N NaOH, and shake at room temperature for 3 hours. Using phenolphthalein as an indicator, excess NaOH was subjected to back titration with 0.1 NH ₂ SO ₄ , and the carboxymethyl substitution degree (DS value) was calculated by the following formula. A=[(100×F'-0.1NH ₂ SO ₄ (mL)×F)×0.1]/(extremely dry mass of H-CMC (g)) carboxymethyl substitution degree=0.162×A/(1-0.058 × _A ) F': factor for _0.1NH2SO4 F: factor for 0.1N-NaOH.

As the cellulose polymer that can be used in the first embodiment of the present invention, the chemically modified cellulose of the slurry may be used as it is, or the slurry may be powdered and used by pulverization or the like. In addition, defibrillation treatment may be performed on the pulp, and dried products such as microfibril-like cellulose or nanofiber-like cellulose may be used.

Cellulose nanofibers can be produced by applying strong shearing force to a cellulose raw material in an unmodified state or after chemically modifying it. In the first embodiment of the present invention, the cellulose raw material may be unmodified or chemically modified, but preferably chemically modified. It is presumed that cellulose nanofibers produced using chemically modified cellulose raw materials have more uniform fiber length/fiber diameter than cellulose nanofibers produced using unmodified cellulose raw materials. The dispersibility in water is stable and the effect is better. The method of chemical modification is not particularly limited, and for example, oxidation, etherification, phosphorylation, esterification, silane coupling, fluorination, cationization and the like can be carried out. Among them, any of oxidation using an N-oxy compound, carboxymethylation, and cationization is preferable, and carboxymethylation or oxidation is particularly preferable.

In addition, as the cellulose polymer that can be used in the first embodiment of the present invention, the dry solid content when filled in the packaging bag is preferably 60% by weight or more, more preferably 70% by weight or more, even more preferably 80% by weight or more. When the dry solid content is within this range, the deviated amount of the equilibrium moisture in the package is reduced, so that deterioration of the cellulose polymer due to moisture can be suppressed. ＜Packaging bag＞

In the first embodiment of the present invention, the packaging bag can be used without particular limitation as long as it has a gas barrier property. In the present invention, having gas barrier properties means having a function of inhibiting penetration of oxygen, moisture, etc. As such a packaging bag, preferably a packaging bag using the following films: aluminum having high gas barrier properties; Nylon film coated with acrylonitrile, polyvinyl alcohol, and polyvinylidene chloride resin; set on ethylene-vinyl alcohol copolymer, olefin-based polymer, olefin-polycarboxylic acid copolymer, or plastic substrate Transparent barrier films formed by vapor deposition layers of inorganic oxides such as silicon oxide and aluminum oxide; and barrier films provided with vapor deposition layers of metals such as aluminum.

In addition, it is suitable that the outermost layer of the packaging bag is high in strength and not easily damaged, and is preferably a paper base material. As such a paper base material, kraft paper is mentioned, for example.

Therefore, in the packaging bag used in the first embodiment of the present invention, it is preferable that the outermost layer is a paper base material and the inner layer has a gas barrier layer. Such a gas barrier layer can also be used as another bag as an inner bag. The outermost paper base material can be used by adding additional processing (eg, lamination processing). The gas barrier layer is more preferably used as an inner bag from the viewpoint of ease of handling and the like.

Moreover, from the viewpoint of maintaining the quality of the filled cellulose polymer, the packaging bag used in the first embodiment of the present invention preferably has ultraviolet light impermeability or light shielding properties. <Filling of cellulose polymers>

The method of filling the packaging bag with the cellulose polymer is not particularly limited, as long as the packaging bag is appropriately filled with the cellulose polymer. In addition, if the filling amount is too large, the adjustment of the oxygen concentration and the adjustment of the condition (3) described later related to the first embodiment will become difficult. Therefore, the filling amount of the cellulose polymer is preferably equal to the inner volume of the packaging bag. 99% or less, more preferably 95% or less, and even more preferably 90% or less.

In addition, when the packaging bag is a packaging bag having an outer bag (or outer layer) whose outermost layer is a paper base material and an inner bag (or inner layer) in the gas barrier layer, the cellulose polymer may be filled in the packaging bag. The outer bag is packed after the inner bag, or the inner bag can be put into the outer bag before filling with cellulose polymer. <Adjustment of the oxygen concentration in the packaging bag>

The adjustment of the oxygen concentration in the packaging bag is not particularly limited, but it is preferably carried out after filling the cellulose polymer. For example, after filling the cellulose polymer, 1) a method of vacuumizing the packaging bag, 2) The method of replacing the inside of the packaging bag with nitrogen gas, 3) the method of vacuuming the packaging bag and then replacing with nitrogen gas, and 4) the method of enclosing an oxygen absorber in the packaging bag together. Among these methods, the method in which the inside of the packaging bag is evacuated and then substituted with nitrogen gas is more suitable in the first embodiment of the present invention because aggregation of cellulose polymers can be suppressed.

In the packaging method according to the first embodiment of the present invention, it is important to adjust the oxygen concentration in the packaging bag to be 0.8% or less and to perform sealing. When the oxygen concentration exceeds 0.8%, deterioration of the cellulose polymer is likely to occur, and the viscosity of the cellulose polymer may decrease when the cellulose polymer is turned into an aqueous solution. The oxygen concentration is preferably 0.75% or less, more preferably 0.7% or less, and even more preferably 0.6% or less. The lower limit of the oxygen concentration is not limited, but is preferably 0.1% or more, more preferably 0.2% or more, and even more preferably more than 0.3% from the viewpoints of workability and adjustment of the internal pressure during nitrogen substitution.

Moreover, it is preferable to make the internal pressure in a packaging bag 85 kPa or less, and it is especially suitable that the internal pressure in a gas barrier layer is 85 kPa or less. When the internal pressure exceeds 85 kPa, the expansion of the packaging bag with respect to the filler becomes large, so that it is difficult to be in a stacked state in which the packaging bags are stacked, and there is a problem in transportation and the like. The inner pressure of such a packaging bag is more preferably 80 kPa or less.

In addition, the method of adjusting the internal pressure in the packaging bag is not particularly limited. For example, in the case of the method of making the packaging bag evacuated and then replacing it with nitrogen, when filling with nitrogen after the vacuum treatment, the inflow of nitrogen gas can be adjusted appropriately. The amount and the indicated value of the internal pressure from the original pressure can be adjusted appropriately. <Shape of the sealed bag>

In the first embodiment of the present invention, the packaging bag filled with cellulose polymer, adjusted for oxygen concentration and then sealed, is installed on a horizontal installation surface (referred to as a horizontal surface) so that the longest long side L is horizontal. It is important that the depth D of the starting bag and the long side L satisfy the relational expression of 6.1≦L/D≦10.

FIG. 1 shows a cellulose polymer-filled packaging bag placed on a horizontal plane so that the longest long side L is horizontal. In the present invention, after the packaging bag filled with cellulose polymer is set horizontally, it is important that the filling area is uniformly filled along the horizontal plane before measuring the long side L and the depth D.

Such a long side L does not include the sealing opening of the packaging bag, but only represents the length of the filling area of the packaging bag. The long side L is preferably in the range of 700 mm or more and 1100 mm or less, more preferably 700 mm or more and 1000 mm or less, and still more preferably 700 mm or more and 900 mm or less.

The short side W perpendicular to the long side L of the packaging bag filled with the cellulose polymer is preferably 400 mm or more and less than 700 mm, more preferably 450 mm or more and 650 mm or less, still more preferably 450 mm or more and 600 mm or less.

The depth D of the packaging bag filled with the cellulose polymer is preferably less than 130 mm, more preferably 125 mm or less, and even more preferably 120 mm or less.

In the packaging method of the cellulose polymer according to the first embodiment of the present invention, by satisfying the above-mentioned relational expression, an appropriate balance is obtained when laminating the packaging bags filled with the cellulose polymer, and the lamination is facilitated. Moreover, by making the long side L, the depth D, and the short side W of the packaging bag satisfy the above-mentioned ranges, filling of the cellulose polymer becomes easy, and the stacking of the packaging bag becomes easy. Furthermore, when the packaging bags are stacked and transported, the stacked state is unlikely to be out of balance due to vibration or the like, which is important in the present invention.

In the first embodiment of the present invention, when the packaging bags are laminated, it is preferably in a laminated state of not less than 2 layers and not more than 10 layers, and more preferably in a state of accumulation of not less than 2 layers and not more than 8 layers. If the laminated state is within this range, the balance of the laminated state of the packaging bag can be more ideal. 2. The second embodiment of the present invention

As another embodiment of the present invention, there is provided a method for packaging a cellulose polymer, which is characterized by having gas barrier properties within the range of the outermost surface having a static friction coefficient of 0.2 to 0.5 and a dynamic friction coefficient of 0.15 to 0.35. The packaging bag is filled with cellulose polymer (hereinafter also referred to as the second embodiment).

First, the packaging bag, which is one of the characteristic parts of the second embodiment, will be described. ＜Packaging bag＞ In the second embodiment of the present invention, the packaging bag can be used without particular limitation as long as it is a packaging bag having gas barrier properties. In the present invention, having gas barrier properties means having the function of inhibiting penetration of oxygen, moisture, etc. As such a packaging bag, preferably a packaging bag using the following films: aluminum having high gas barrier properties; Nylon film coated with acrylonitrile, polyvinyl alcohol, polyvinylidene chloride resin; ethylene-vinyl alcohol copolymer, olefin-based polymer, olefin-polycarboxylic acid copolymer or base material made of plastic. Transparent barrier films formed by vapor deposition layers of inorganic oxides such as silicon and aluminum oxide; and barrier films provided with vapor deposition layers of metals such as aluminum.

In addition, it is suitable that the outermost layer of the packaging bag is high in strength and not easily damaged, and is preferably a paper base material. As such a paper base material, kraft paper is mentioned, for example.

Therefore, in the packaging bag used in the second embodiment of the present invention, the outermost layer is preferably a paper base material and the inner layer has a gas barrier layer. Such a gas barrier layer can also be used as another bag as an inner bag. The outermost paper base material can be used by adding additional processing (eg, lamination processing). From the viewpoint of ease of handling and the like, the gas barrier layer is more preferably used as an inner bag.

It is important that the outermost surface of such a packaging bag has a static friction coefficient in the range of 0.2 to 0.5, preferably in the range of 0.2 to 0.45, and more preferably in the range of 0.2 to 0.4. By making the static friction coefficient of the outermost surface within this range, even if the packaging bag is filled with cellulose polymer and the packaging bags are stacked on a pallet for transportation, it is not easy to lose balance and fall off. , and the friction force is not too strong, so it is easy to adjust the lamination state by sliding the packaging bag during lamination.

In addition, it is important that the dynamic friction coefficient of the outermost surface of the packaging bag is in the range of 0.15 to 0.35, preferably in the range of 0.2 to 0.35, and more preferably in the range of 0.22 to 0.32. By setting the coefficient of kinetic friction of the outermost surface to this range, even if the packaging bags are filled with cellulose polymers and the packaging bags are stacked on a pallet for transportation, the stacked packaging bags can be easily stacked. It moves smoothly and the bag is not likely to lose its balance and fall off. This is an appropriate range. In addition, the measurement of the static friction coefficient and the dynamic friction coefficient of the outermost surface of the packaging bag can be measured according to JIS P8147.

Furthermore, the outermost layer of the packaging bag has a smoothness in the range of 2 to 10 seconds, more preferably in the range of 3 to 9 seconds, and even more preferably in the range of 4 to 8 seconds. By making the smoothness within this range, the unevenness of the outermost layer surface can be prevented from falling off and obtained when sliding when filling a packaging bag with a cellulose polymer and stacking the packaging bags on a pallet for transportation. proper balance. The smoothness can be measured by the Wang Yan method according to JIS P8155.

Furthermore, in the second embodiment of the present invention, the outermost layer of the packaging bag preferably satisfies the range of the basis weight of 50-100 g/m ² , more preferably satisfies the range of 60-100 g/m ² , and most preferably satisfies the range of 65 g/m 2 . ~95g/m ² range. By making the outermost layer base material of the packaging bag satisfy the above-mentioned range, even in the case of filling with a cellulose polymer, it is possible to easily exert the optimum balance as the aforementioned outermost layer while maintaining the strength. Basis weight can be measured according to JIS P8124.

Moreover, from the viewpoint of maintaining the quality of the filled cellulose polymer, the packaging bag used in the first embodiment of the present invention preferably has ultraviolet light impermeability or light shielding properties.

Other technical matters related to the second embodiment are the same as those of the first embodiment described above. That is, the descriptions of matters and the like described in the description related to the following first embodiment can also be used in the second embodiment in the same way as the first embodiment: definition of cellulose polymer; oxidation method for etherification; carboxymethylated cellulose; cellulose; natural cellulose; degree of carboxymethyl substitution per unit of anhydrous glucose of carboxymethylated cellulose; anhydrous glucose unit; measurement method for degree of carboxymethyl substitution ; The shape of the cellulose polymer (pulp-like, powder-like, microfibril-like, nano-fibrous, etc.); the dry solid content when filling in the packaging bag; the state related to the number of layers of the packaging bag. 3. Combination of the first embodiment and the second embodiment

As another embodiment of the present invention, the above-mentioned first embodiment and second embodiment can also be combined. As such a modification, the following embodiment is mentioned, for example. <Example of Combination of First and Second Embodiments>

A packaging method for cellulose polymers, which is to fill a cellulose polymer in a packaging bag with gas barrier properties and seal the aforementioned packaging bag, which satisfies the following conditions (1) to (4): Condition (1): Fill a cellulose polymer in a packaging bag with gas barrier properties; Condition (2): Adjust the oxygen concentration in the packaging bag to be less than 0.8% and seal it; Condition (3): When the longest long side L of the packaging bag filled with cellulose polymer is set to be horizontal, the depth D of the packaging bag from the horizontal plane and the long side L satisfy the relational expression of 6.1≦L/D≦10; Condition (4): Satisfy the range of the static friction coefficient of the outermost layer surface of the packaging bag being 0.2 to 0.5 and the dynamic friction coefficient of 0.15 to 0.35.

In the case of the combination of the first and second embodiments, the specific technical matters or preferred examples, etc., can also be adopted in the same manner as the contents described in the above-mentioned first embodiment or the second embodiment. 4. The third embodiment of the present invention

As described above, some aspects of the present invention are methods of packaging methods, transportation methods, and the like, and according to the present invention, there is provided a cellulose polymer packaging material using this packaging method. As an embodiment of the package, the following cellulose polymer package is provided according to the packaging method shown in the above-mentioned first embodiment.

A cellulose polymer packaging, comprising a sealed packaging bag and a cellulose polymer filled in the packaging bag, which satisfies the following conditions (1) to (3): Condition (1): Fill a cellulose polymer in a packaging bag with gas barrier properties; Condition (2): Adjust the oxygen concentration in the packaging bag to be less than 0.8% and seal it; Condition (3): When the longest long side L of the packaging bag filled with cellulose polymer is horizontal, the depth D of the packaging bag from the horizontal plane and the long side L satisfy the relational expression of 6.1≦L/D≦10.

As another embodiment of the package, according to the packaging method shown in the above-mentioned second embodiment, the following cellulose polymer package is provided.

A cellulose polymer package, comprising a sealed packaging bag with gas barrier properties and a cellulose polymer filled in the packaging bag, wherein the packaging bag satisfies the static friction coefficient of the outermost surface of 0.2 to 0.5 and The coefficient of kinetic friction is in the range of 0.15 to 0.35.

For more specific technical matters or preferred examples related to the third embodiment, the contents described in the above-mentioned first embodiment or the second embodiment can be adopted in the same manner. Moreover, it can also be used as a package of a cellulose polymer in which the technical matters shown in the first embodiment and the second embodiment are combined. [Example] <First Example Group> [Example 1-1]

Carboxymethyl cellulose (manufactured by Nippon Paper Co., Ltd., product name: MAC500LC) was filled into the following packaging bag: the packaging bag was in an unfilled (empty bag) state, 850 mm in length, 565 mm in width, and the outermost layer was a kraft paper base material, and has a film substrate inside. After filling, evacuating and then injecting nitrogen gas, adjusting the oxygen concentration in the package to 0.50%, adjusting the indicated value of the internal pressure to 70kPa, and sealing the sealing port. The obtained packaging bag is set on a horizontal plane, the contents of the packaging bag are evenly distributed in the filling area, etc., and then the packaging bag is measured. As a result, the longest long side L is 760 mm, and the depth D from the horizontal plane is 110 mm, which is in line with the long side L. The short side W of the cross is 520mm. [Example 1-2]

A packaging bag was obtained in the same manner as in Example 1-1, except that carboxymethyl cellulose (manufactured by Nippon Paper Co., Ltd., product name: MAC350HC) was used. [Example 1-3]

A packaging bag was obtained in the same manner as in Example 1, except that carboxymethyl cellulose (manufactured by Nippon Paper Co., Ltd., product name: MAC800LC) was used. [Comparative Example 1-1]

A packaging bag was obtained in the same manner as in Example 1, except that the oxygen concentration in the package was set to 0.3% and the internal pressure indication value was set to 90 kPa. The obtained packaging bag is set on a horizontal plane, and after the contents of the packaging bag are evenly distributed in the filling area, the packaging bag is measured. As a result, the longest long side L is 760 mm, and the depth D from the horizontal plane is 130 mm, which is the same as the long side L. The orthogonal short side W is 520 mm.

[Table 1] packaging bag filler filled bag outermost layer inner layer Oxygen concentration (%) Internal pressure (KPa) L (mm) D (mm) W (mm) L/D Example 1-1 Kraft paper film MAC500LC 0.5 70 760 110 520 6.9 Example 1-2 Kraft paper film MAC350HC 0.5 70 760 110 520 6.9 Examples 1-3 Kraft paper film MAC800LC 0.5 70 760 110 520 6.9 Comparative Example 1-1 Kraft paper film MAC500LC 0.3 90 760 130 520 5.8

The viscosity of the 1% aqueous solution was measured immediately after filling with the carboxymethyl cellulose of Examples 1-1 to 1-3 and Comparative Example 1-1, and stored in a safe box at 50°C for 1 month, 3 months, and 6 months. The viscosity of the 1% aqueous solution was measured after one month. In addition, the adjustment method of an aqueous solution and the measurement method of a viscosity were performed by the method mentioned later. In addition, when the obtained packaging bag was stacked on a pallet in 4 rows and 6 layers to perform lamination, the lamination state was visually confirmed. <Preparation of aqueous solution>

The above dish balance weighs about 10g of the sample. The sample was slowly poured into a beaker containing 880 ml of pure water, using a mixer for dissolution, and stirred for 3 hours. Correction is made so that the concentration of pure water calculated from the moisture value is 1%. ＜Viscosity measurement＞

After stirring for 3 hours (complete dissolution was confirmed), the temperature of the solution was adjusted to 25±0.2°C. Viscosity was measured using a B-type viscometer. Measurements were read on the scale 3 minutes after rotor start-up. [Viscosity change rate]

Calculated by the following formula (1), the viscosity of the 1% aqueous solution (viscosity 2) of the cellulose polymer after being packaged and stored at 50°C (1 month, 3 months, and 6 months) in a safe is relative to the elapsed days 0 Viscosity change rate of 1% aqueous solution viscosity (viscosity 1) of cellulose polymer for days (before packaging). [(Viscosity 2-Viscosity 1)/Viscosity 1]×100 (%)･･･（1）

[Table 2] Viscosity change rate Laminated state number of months 0 1 month 3 months 6 months Example 1-1 0 -1 -1 -3 The bags are tightly layered and well-balanced. Example 1-2 0 -3 -3 -4 The bags are tightly layered and well-balanced. Examples 1-3 0 -4 -1 -3 The bags are tightly layered and well-balanced. Comparative Example 1-1 0 -1 -1 -2 The bags swelled, were not tightly layered and were poorly balanced.

It was found that the carboxymethyl cellulose filled in the packaging bags of Examples 1-1 to 1-3 maintained a high viscosity after storage. Furthermore, the internal pressure balance of the packaging bag relative to the strength of the packaging bag is excellent without swelling, so the balance during lamination is also excellent. On the other hand, since the packaging bag of Comparative Example 1-1 kept the oxygen concentration low, the viscosity maintenance effect of carboxymethyl cellulose was excellent, but the internal pressure was high and the packaging bag swelled, and the balance in the laminated state was Not good and not suitable as a form of transport. <Second Example Group> [Example 2-1]

Carboxymethyl cellulose (manufactured by Nippon Paper Co., Ltd., product name: MAC500LC) was filled in the following packaging bag: the outermost layer of the packaging bag was a kraft paper base (surface static friction coefficient: 0.32, dynamic friction coefficient: 0.28, Wang Yan type Smoothness: 5 seconds, basis weight: 85 g/m ² ), the inner layer has a film substrate. After filling and evacuation, nitrogen was injected, the oxygen concentration in the package was adjusted to 0.50%, the indicated value of the internal pressure was adjusted to 70kPa, and the sealing opening was sealed to obtain a packaging bag filled with carboxymethyl cellulose 2-1 . [Example 2-2]

The outermost layer was changed to a kraft paper base (surface static friction coefficient: 0.30, dynamic friction coefficient: 0.28, Wang Yan type smoothness: 5 seconds, basis weight: 76 g/m ² ), and the same procedure as in Example 1 was carried out. The packaging bag 2-2 filled with carboxymethyl cellulose was obtained. [Comparative Example 2-1]

The film base (surface static friction coefficient: 0.12, dynamic friction coefficient: 0.1, Wang Yan type smoothness: unmeasurable, basis weight: 109 g/m ² ) was used as the outermost layer to change, without using the kraft paper base material. Besides, the packaging bag 3 filled with carboxymethyl cellulose was obtained in the same manner as in Example 1.

[table 3] packaging bag filler outermost layer inner layer Example 2-1 Kraft paper film MAC500LC Example 2-2 Kraft paper film MAC500LC Comparative Example 2-1 film - MAC500LC

In Examples 2-1 and 2-2, the viscosity of the 1% aqueous solution was measured immediately after filling with carboxymethyl cellulose, and after storage in a safe box at 50°C for 1 month, 3 months, and 6 months 1 % viscosity of aqueous solution. In addition, the adjustment method of the aqueous solution, the measurement method of the viscosity, and the calculation of the viscosity change rate are all performed by the same methods as those shown in the above-mentioned first example group.

Moreover, the lamination easiness and lamination state when the packaging bags of Examples 2-1 and 2-2 and Comparative Example 2-1 were stacked in 4 rows and 6 layers on a pallet were visually confirmed.

[Table 4] Viscosity change rate Laminated state number of months 0 1 month 3 months 6 months Example 2-1 0 -1 -1 -3 Each bag can be slid and easily adjusted into a tightly stacked state. Moreover, the balance at the time of lamination is also excellent. Example 2-2 0 -1 -1 -3 Each bag can be slid and easily adjusted into a tightly stacked state. Moreover, the balance at the time of lamination is also excellent. Comparative Example 2-1 - - - - As soon as each package slides, it loses its balance and cannot maintain a tightly stacked state.

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Fig. 1 is a packaging bag filled with cellulose polymer, which is a diagram in which the longest long side L of the packaging bag is horizontal with the horizontal installation surface (horizontal surface), D represents the depth from the horizontal surface, and W represents the distance from the horizontal surface. The short side in the orthogonal width direction.

Claims (22)

A packaging method for a cellulose polymer, which satisfies the following conditions (1) to (3): condition (1): filling a cellulose polymer in the aforementioned packaging bag with gas barrier properties; condition (2): adding the aforementioned The oxygen concentration in the packaging bag is adjusted to be less than 0.8% and sealed; Condition (3): The depth D of the packaging bag from the horizontal plane when the longest long side L of the packaging bag filled with cellulose polymer is set horizontally The relational expression of 6.1≦L/D≦10 is satisfied with the long side L. The method for packaging a cellulose polymer according to claim 1, wherein the longest side L of the packaging bag filled with the cellulose polymer is 700 mm or more and 1100 mm or less. The method for packaging a cellulose polymer according to claim 1, wherein the short side W orthogonal to the long side L in the aforementioned packaging bag filled with the cellulose polymer is 400 mm or more and less than 700 mm. The packaging method of cellulose polymer according to claim 1, wherein the depth D of the aforementioned packaging bag filled with the cellulose polymer is less than 130 mm. The packaging method of a cellulose polymer according to claim 1, wherein the aforementioned cellulose polymer is carboxymethyl cellulose. The method for packaging a cellulose polymer according to claim 1, wherein the oxygen concentration is adjusted to 0.8% or less by substituting nitrogen for the inside of the packaging bag after vacuum treatment. The method for packaging a cellulose polymer according to claim 1, wherein the internal pressure in the packaging bag is 85 KPa or less. A packaging method of cellulose polymer, wherein the cellulose polymer is filled in the aforementioned packaging bag with gas barrier properties that satisfies the static friction coefficient of the outermost surface of 0.2 to 0.5 and the dynamic friction coefficient of 0.15 to 0.35. The method for packaging a cellulose polymer according to claim 8, wherein the smoothness of the outermost layer of the packaging bag satisfies the range of 2 to 10 seconds. The method for packaging a cellulose polymer according to claim 8, wherein the outermost layer of the packaging bag is a paper base material. The method for packaging a cellulose polymer according to claim 8, wherein the outermost layer of the aforementioned packaging bag satisfies the range of a basis weight of 50 to 100 g/m ² . The packaging method of a cellulose polymer according to claim 8, wherein the aforementioned cellulose polymer is carboxymethyl cellulose. The method for packaging a cellulose polymer according to claim 8, wherein after vacuum processing the inside of the packaging bag, nitrogen gas substitution is performed to adjust the oxygen concentration to 0.8% or less. The method for packaging a cellulose polymer according to claim 8, wherein the internal pressure in the packaging bag is 85 KPa or less. A method of transporting a cellulose polymer, which comprises laminating and transporting packaging bags obtained by the method for packaging a cellulose polymer according to any one of claims 1 to 14 to a destination. The method for transporting a cellulose polymer according to claim 15, wherein the packaging bag is in a stacked state of two or more layers and no more than 10 layers. A cellulose polymer packaging, which has a sealed packaging bag and a cellulose polymer filled in the aforementioned packaging bag, and satisfies the following conditions (1) to (3): Condition (1): when there is a gas The barrier property packaging bag is filled with cellulose polymer; Condition (2): the oxygen concentration in the packaging bag is adjusted to be below 0.8% and sealed; Condition (3): When the packaging bag filled with cellulose polymer is installed so that the longest long side L becomes horizontal, the depth D of the packaging bag from the horizontal plane and the long side L satisfy the relational expression of 6.1≦L/D≦10 . The cellulose polymer packaging according to claim 17, wherein the aforementioned packaging bag satisfies the range of the outermost surface with a static friction coefficient of 0.2 to 0.5 and a dynamic friction coefficient of 0.15 to 0.35. The package of cellulose polymer according to claim 17 or 18, wherein the aforementioned cellulose polymer is carboxymethyl cellulose. The cellulose polymer packaging according to claim 17 or 18, wherein the oxygen concentration in the aforementioned packaging bag is greater than 0.3% and less than 0.8%. The cellulose polymer packaging according to claim 17 or 18, wherein the internal pressure in the aforementioned packaging bag is 85 KPa or less. The cellulose polymer packaging according to claim 17 or 18, wherein the packaging bag has a layer structure of 2 or more layers, the outermost layer of the packaging bag is a paper base material, and the inner bag located on the inner side of the outermost layer At least one of the layers is a gas barrier layer.

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