Paper-making composition, as well as pulp-molded product and method for manufacturing the same

Abstract

To provide a paper-making composition that contributes to the recycling of grain glumes such as malt husks, as well as a pulp-molded product and a method for manufacturing the same.SOLUTION: A paper-making composition contains grain glumes and cellulose fibers, and the content of the grain glumes is 25 mass% or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a papermaking composition, a pulp molded body, and a method for manufacturing the same.

Background Art

[0002] A pulp mold, which is a molded body made of pulp as a papermaking raw material and having a predetermined shape, is used, for example, as a packaging material for food products such as eggs and fruits, as a packaging material for various gifts, and as a shock-absorbing material for transportation of home appliances and peripheral devices of personal computers. As the above pulp, in addition to plant-derived pulp called so-called virgin pulp, waste paper pulp derived from cardboard, newspapers, etc., recycled pulp, etc. are used. Virgin pulp has a longer fiber length than waste paper pulp and recycled pulp, and the pulp mold made from virgin pulp has the highest strength. On the other hand, from the viewpoint of reducing environmental load such as forest environment protection and reduction of carbon dioxide emissions, there is also a demand to reduce the amount of virgin pulp used as much as possible.

[0003] Food fibers, food wastes, etc. discharged as by-products in food manufacturing factories, etc. are added to the above papermaking raw materials, and pulp molds are also produced for the purpose of waste utilization and reduction of environmental load. However, since the above food fibers and food wastes often contain moisture, it is necessary to perform dehydration treatment, drying treatment, etc. when adding them to the pulp as a papermaking raw material. In addition, since the above food fibers and food wastes contain nutritional components such as amino acids, flavonoids, vitamins, polyphenols, etc., treatment for preventing spoilage during storage is required, or there is a limit to the upper limit of the addition amount for reducing the load in the papermaking apparatus.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The recycling of by-products and waste generated in a beer factory is one of the important aspects. By-products and waste generated in a beer factory include, for example, the press cake after extracting necessary components such as malt and hops in the charging process. This press cake contains nutritional components and is mainly used as livestock feed and the like.

[0006] On the other hand, in the conveying path for conveying malt produced in the malting process to the charging process, powdery chaff (lemma, palea, and glume, etc.) is generated as waste due to abrasion of the malt. Since this chaff contains almost no nutritional components, it cannot be used as livestock feed or the like. Also, incinerating the chaff leads to an increase in carbon dioxide emissions. Therefore, the recycling of chaff is required.

[0007] In view of the above problems, an object of the present invention is to provide a papermaking composition that contributes to the recycling of cereal glumes such as malt chaff, as well as a pulp mold formed body and a method for manufacturing the same.

Means for Solving the Problems

[0008] In order to solve the above problems, the present invention provides a papermaking composition containing cereal glumes and cellulose fibers, characterized in that the content rate of the cereal glumes is 25% by mass or less.

[0009] The present invention also provides a pulp mold formed body characterized in that it is produced by heat-molding a pulp mold intermediate obtained by lifting the above papermaking composition from a slurry containing the above papermaking composition using a mold.

[0010] Furthermore, the present invention provides a method for manufacturing a pulp mold formed body, characterized by including a step of preparing a slurry containing the above papermaking composition, a step of producing a pulp mold intermediate by lifting the above papermaking composition from the slurry using a mold, and a step of heat-molding the pulp mold intermediate.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a papermaking composition that contributes to the recycling of cereal glumes such as malt husks, as well as a pulp molded body and a method for manufacturing the same.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0013] The papermaking composition according to Aspect 1 of the present invention contains cereal glumes and cellulose fibers, and is characterized in that the content of the cereal glumes is 25% by mass or less.

[0014] The papermaking composition according to Aspect 2 of the present invention is characterized in that, in the above Aspect 1, the content of the cereal glumes is 20% by mass or less.

[0015] The papermaking composition according to Embodiment 3 of the present invention is characterized in that, in the above Embodiment 1 or Embodiment 2, the content of the glumes of the cereals is less than 20% by mass.

[0016] The papermaking composition according to Embodiment 4 of the present invention is characterized in that, in any one of the above Embodiments 1 to 3, the glumes of the cereals are the husks of malt.

[0017] The papermaking composition according to Embodiment 5 of the present invention is characterized in that, in any one of the above Embodiments 1 to 4, the cellulose fiber is pulp.

[0018] The papermaking composition according to Embodiment 6 of the present invention is characterized in that, in the above Embodiment 5, the pulp is virgin pulp and / or wastepaper pulp.

[0019] The papermaking composition according to Embodiment 7 of the present invention is characterized in that, in any one of the above Embodiments 1 to 6, the content of the glumes of the cereals is 10% by mass or less.

[0020] The papermaking composition according to Embodiment 8 of the present invention is characterized in that, in any one of the above Embodiments 1 to 7, the content of the glumes of the cereals is 1 to 10% by mass.

[0021] The pulp mold molded body according to Embodiment 9 of the present invention is produced by heat-molding a pulp mold intermediate obtained by lifting the papermaking composition from a slurry containing the papermaking composition according to any one of the above Embodiments 1 to 8 using a mold.

[0022] The method for manufacturing a pulp mold molded body according to Embodiment 10 of the present invention includes a step of preparing a slurry containing the papermaking composition according to any one of the above Embodiments 1 to 8, a step of producing a pulp mold intermediate by lifting the papermaking composition from the slurry using a mold, and a step of heat-molding the pulp mold intermediate.

[0023] Embodiments of the present invention will be described. The papermaking composition according to this embodiment contains cereal glumes and cellulose fibers.

[0024] The "cereals" in this embodiment include, for example, wheat such as barley, wheat, and rye, as well as rice, corn, soybeans, peas, etc., which are widely referred to as "grains". Preferred examples of the "cereals" in this embodiment include wheat such as barley, wheat, and rye.

[0025] The "cereals" in this embodiment include caryopses (or grains) and glumes (also referred to as paleas, lemmas, glumes, etc.) that wrap the caryopses (grains). The "glumes" in this embodiment are, for example, the husks (paleas and lemmas) that wrap the caryopses of malt in wheat such as barley, wheat, and rye, and the hulls that wrap the caryopses (grains) in rice. In the following, the glumes of barley malt (husks, paleas, and lemmas) will be taken as an example for explanation, but it goes without saying that it is not limited to this.

[0026] Barley (scientific name: Hordeum vulgare) is a cereal belonging to the genus Hordeum in the family Poaceae. Known varieties of barley include two-row barley, four-row barley, six-row barley, naked barley, wild barley, etc. The barley in this embodiment may be any of the above varieties, but two-row barley, which is mainly used as a raw material for beer production, is sufficient.

[0027] Malt is obtained by germinating barley seeds. The malt in this embodiment may be malt produced in the malting process, which is one of the steps in the beer production process. That is, the malt in this embodiment may be one produced through a malting process including a steeping process of soaking barley in water, a germination process of germinating the soaked barley, and a roasting process of drying the germinated barley with hot air.

[0028] Barley malt includes a glume as an outer skin and a caryopsis wrapped by the glume. The glume of the malt includes a palea and a lemma that wraps the palea. The papermaking composition according to the present embodiment contains the glumes (hulls, palea, and lemma) of barley malt. The glumes (hulls, palea, and lemma) in the present embodiment may be powdery glumes (hulls, palea, and lemma) that are generated by rubbing during the conveyance path in which the malt produced in the malting process, which is one process of the beer manufacturing process, is conveyed to the mashing process, which is the next process.

[0029] The cellulose fibers contained in the papermaking composition according to the present embodiment are not particularly limited and may be of any type as needed. Examples of the cellulose fibers in the present embodiment include softwood unbleached kraft pulp (NUKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached sulfite pulp (NUSP), hardwood unbleached sulfite pulp (LUSP), softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), hardwood bleached sulfite pulp (LBSP), etc. of wood pulp; non-wood pulp such as straw pulp, bamboo pulp, lint pulp, kenaf pulp; waste paper pulp (recycled pulp), etc. The cellulose fibers in the present embodiment may be one or a mixture of two or more of the above.

[0030] The Canadian standard drainage degree (JIS P 8121-2:2012) in a mixture of one or more of wood pulp, non-wood pulp, and waste paper pulp (recycled pulp) as cellulose fibers may be appropriately set from the viewpoints of pulp raw material productivity, papermaking property during the production of pulp moldings, etc.

[0031] The content ratio of the glumes (hulls, palea, and lemma) of barley malt in the papermaking composition according to this embodiment may be 25% by mass or less, preferably 20% by mass or less, more preferably less than 20% by mass, and even more preferably 10% by mass or less. Also, the content ratio may be 1% by mass or more, preferably 2% by mass or more, and more preferably 5% by mass or more. Although it also depends on the weight of articles and the like accommodated in the pulp mold formed body produced from the papermaking composition, the shape of the pulp mold formed body, etc., if the content ratio is 25% by mass or less, the pulp mold formed body will have sufficient strength (buckling strength). If the content ratio is 20% by mass or less, the pulp mold formed body produced from the papermaking composition will have sufficient strength (buckling strength). Also, if the content ratio is relatively too small (for example, about 2% or less), it becomes difficult for the glumes (hulls, palea, and lemma) of barley malt to be uniformly present in the pulp mold formed body produced from the papermaking composition, which may cause a decrease in strength (buckling strength).

[0032] The papermaking composition according to this embodiment may contain various additives such as pigments, fungicides, sizing agents, paper strength enhancers, surfactants, colorants, preservatives, antioxidants, water resistance agents, adhesives, release agents, etc., as necessary and according to the uses of the pulp mold formed body produced from the papermaking composition. The addition amount (content ratio) of the additives is not particularly limited and can be appropriately set according to the purpose of adding various additives. The papermaking composition according to this embodiment may not contain the above additives. According to the papermaking composition according to this embodiment, a pulp mold formed body having sufficient strength (buckling strength) can be produced even without containing the above additives.

[0033] The papermaking composition according to this embodiment can be used as a papermaking raw material for manufacturing a paper product by a conventionally known method. In the paper product manufactured from the papermaking composition according to this embodiment, even though the papermaking composition contains the glumes (hulls, paleas, and lemmas) of barley malt, it can obtain sufficient strength (buckling strength) comparable to that of a paper product manufactured from a papermaking composition that does not contain the glumes (hulls, paleas, and lemmas) of barley malt (containing only cellulose fibers such as various pulps). Further, since the papermaking composition according to this embodiment mainly contains the glumes (hulls, paleas, and lemmas) of barley malt, which are by-products in the beer manufacturing process, it also has the effect of contributing to the recycling of the by-product glumes (hulls, paleas, and lemmas) of barley malt.

[0034] A pulp mold formed body as a paper product manufactured using the papermaking composition according to the above-described embodiment will be described. FIG. 1 is a perspective view showing a schematic configuration of an example of the pulp mold formed body according to this embodiment, and FIG. 2 is a perspective view showing a state in which an article is stored in the pulp mold formed body shown in FIG. 1.

[0035] The pulp mold formed body 1 in this embodiment is obtained by pressing a pulp mold intermediate obtained by lifting up the papermaking composition using a mold from a slurry containing the papermaking composition according to this embodiment, using a mold engaged with the mold, and heating and drying in a state pressed by the mold and the mold. Therefore, the pulp mold formed body 1 in this embodiment contains the glumes (hulls, paleas, and lemmas) of barley malt and cellulose fibers. In the pulp mold formed body 1 in this embodiment, the content ratio of the glumes (hulls, paleas, and lemmas) of barley malt may be 25% by mass or less, preferably 20% by mass or less, more preferably less than 20% by mass, and even more preferably 10% by mass or less. Further, the content ratio may be 1% by mass or more, preferably 2% by mass or more, and more preferably 5% by mass or more.

[0036] The pulp mold-formed body 1 in the present embodiment can take various shapes by the design of the mold and the mold engaged therewith. For example, as shown in FIGS. 1 and 2, the pulp mold-formed body 1 may be an inner box 1 having a housing portion 2 capable of housing a cosmetic container 3 or the like as an article. The inner box 1 has a rounded rectangular shape in plan view and is housed in an outer box (not shown) for use. The housing portion 2 is formed as a recess into which the cosmetic container 3 or the like can be fitted. Since the pulp mold-formed body 1 in the present embodiment can house and fix the cosmetic container 3 or the like in the housing portion 2, it can be suitably used as a packaging material.

[0037] According to the pulp mold-formed body 1 in the present embodiment, although the husk (hull, lemma, and palea) of barley malt is contained in the papermaking composition, it is comparable to a sheet formed from a papermaking composition that does not contain the husk (hull, lemma, and palea) of barley malt (contains only cellulose fibers such as various pulps) and sufficient strength (buckling strength) can be obtained. For example, the pulp mold-formed body 1 in the present embodiment has a strength (buckling strength) of about 50 to 125%, preferably about 75 to 125% of the strength (buckling strength) of a pulp mold-formed body manufactured in the same manner except that the papermaking composition does not contain the husk (hull, lemma, and palea) of barley malt. Further, since the papermaking composition used to manufacture the pulp mold-formed body 1 mainly contains the husk (hull, lemma, and palea) of barley malt, which is a by-product in the beer manufacturing process, according to the pulp mold-formed body 1 in the present embodiment, there is also an effect that it can contribute to the recycling of the by-product, the husk (hull, lemma, and palea) of barley malt.

[0038] The method for manufacturing the pulp mold-formed body 1 in the present embodiment will be described in more detail. FIGS. 3A to 3C are cross-sectional views showing schematically each step of the method for manufacturing the pulp mold-formed body 1 in the present embodiment.

[0039] First, a slurry S in which the papermaking composition according to the present embodiment is dispersed in water is prepared by mixing and stirring the papermaking composition and water. If necessary, various additives such as pigments, fungicides, sizing agents, paper strength enhancers, surfactants, colorants, preservatives, antioxidants, water resistance agents, adhesives, and mold release agents may be added to the slurry S.

[0040] Next, the slurry S is supplied to the papermaking tank 10, and the papermaking composition is lifted from the papermaking tank 10 using the mold 11 to form a pulp mold intermediate 1' on the surface 11A of the mold 11 (see FIGS. 3A and 3B). When lifting the papermaking composition using the mold, vacuum suction is performed from the back side of the mold 11. In this way, a water-containing pulp mold intermediate 1' formed on the surface 11A of the mold 11 can be obtained. Depending on the shapes of the mold 11 and the die 12 (i.e., the shape of the pulp mold formed body 1), it becomes difficult for the glumes (hulls, paleas, and lemmas) of barley malt to enter between the mold 11 and the die 12, so that the glumes (hulls, paleas, and lemmas) of barley malt are unevenly present in the pulp mold intermediate 1' formed on the surface 11A of the mold 11, and the strength (buckling strength) of the pulp mold formed body 1 may decrease. However, depending on the weight of the article housed in the housing portion 2 and the like, it is possible to manufacture a pulp mold formed body 1 having a strength (buckling strength) that can withstand practical use.

[0041] Then, the pulp mold intermediate 1' obtained as described above is press-molded using a die 12 engaged with the mold 11, and heat-dried in a state press-molded by the mold 11 and the die 12 (see FIG. 3C). Finally, by releasing the mold 11 and the die 12, the pulp mold formed body 1 can be obtained (see FIG. 1).

[0042] The embodiments described above are described to facilitate the understanding of the present invention and are not described to limit the present invention. Therefore, each element disclosed in the above embodiments is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

Examples

[0043] Hereinafter, the present invention will be described in more detail with reference to production examples, test examples, etc. However, the present invention is not limited to the following production examples, test examples, etc.

[0044] [Production Example 1] 98% by mass of wood pulp as cellulose fiber and 2% by mass of the glumes (hulls, paleas, and lemmas) of barley malt were mixed to prepare a forming composition. The forming composition was added to water and stirred to prepare a slurry S in which the forming composition was uniformly dispersed.

[0045] The slurry S was supplied to a forming vat 10, and the forming composition was lifted using a former 11 while performing vacuum suction from the back side of the former 11 from the forming vat 10, thereby forming a pulp mold intermediate 1' on the surface 11A of the former 11.

[0046] The obtained pulp mold intermediate 1' was press-molded using a mold 12 engaged with the former 11, and heat-dried in a state of being press-molded by the former 11 and the mold 12. By releasing the former 11 and the mold 12, pulp mold molded bodies (Samples 1 to 5) having a box shape with an average wall thickness of 0.7 mm, a width of 80 mm × a depth of 50 mm × a height of 12 mm were produced.

[0047] [Production Example 2] Pulp mold molded bodies (Samples 6 to 10) were produced in the same manner as in Production Example 1, except that the content ratio of the glumes (hulls, paleas, and lemmas) of barley malt in the forming composition was changed to 10% by mass.

[0048] [Production Example 3] Pulp mold molded bodies (Samples 11 to 15) were produced in the same manner as in Production Example 1, except that the content ratio of the glumes (hulls, paleas, and lemmas) of barley malt in the forming composition was changed to 0% by mass.

[0049] [Test Example 1] Buckling Strength Test 1 For the pulp moldings (Samples 1 to 15) produced in Production Examples 1 to 3, the buckling strength (N) was measured using a buckling strength testing apparatus (product name: AUTOGRAPH AGS-X, manufactured by Shimadzu Corporation). The results are shown in Table 1.

[0050]

Table 1

[0051] As shown in Table 1, the buckling strength of the pulp moldings produced using the papermaking composition (Samples 1 to 10) containing 2 to 10% by mass of the glumes (hulls, lemma, and palea) of barley malt was confirmed to be equivalent to that of the pulp moldings produced using the papermaking composition (Samples 11 to 15) that does not contain the glumes (hulls, lemma, and palea) of barley malt (contains only cellulose fibers). Therefore, according to the papermaking composition containing the glumes (hulls, lemma, and palea) of barley malt and the pulp moldings produced therefrom, it is possible to contribute to the recycling of the glumes (hulls, lemma, and palea) of barley malt.

[0052] [Production Example 4] A papermaking composition was prepared by mixing 98% by mass of wood pulp as cellulose fibers and 2.5% by mass of the glumes (hulls, lemma, and palea) of barley malt. The papermaking composition was added to water and stirred to prepare a slurry S in which the papermaking composition was uniformly dispersed.

[0053] The slurry S was supplied to the papermaking tank 10, and the papermaking composition was lifted using the mold 11 while performing vacuum suction from the back side of the mold 11 from the papermaking tank 10, thereby forming a pulp mold intermediate 1' on the surface 11A of the mold 11.

[0054] The obtained pulp mold intermediate 1' was press-molded using a mold 12 engaged with the mold 11, heated and dried in a state press-molded by the mold 11 and the mold 12, and the mold 11 and the mold 12 were released to produce a pulp molding 1 (see Fig. 4, Samples 16 to 20) with an average wall thickness of 0.8 mm.

[0055] Figure 4 is a perspective view of the pulp molded body manufactured in Production Example 4 and subjected to a buckling strength test in Test Example 2 described later, as viewed from the back side. As shown in Figure 4, the pulp molded body 1 includes a housing portion 2 capable of housing a cosmetic container 3 or the like as an article, and a concave portion 4 protruding toward the back side on the bottom surface of the housing portion 2.

[0056] [Production Example 5] A pulp molded body 1 (Samples 21 to 25) was produced in the same manner as in Production Example 4, except that the content ratio of the husk (hull, lemma, and palea) of barley malt in the papermaking composition was changed to 10% by mass.

[0057] [Production Example 6] A pulp molded body 1 (Samples 26 to 30) was produced in the same manner as in Production Example 4, except that the content ratio of the husk (hull, lemma, and palea) of barley malt in the papermaking composition was changed to 15% by mass.

[0058] [Production Example 7] A pulp molded body 1 (Samples 31 to 35) was produced in the same manner as in Production Example 4, except that the content ratio of the husk (hull, lemma, and palea) of barley malt in the papermaking composition was changed to 20% by mass.

[0059] [Production Example 8] A pulp molded body 1 (Sample 36) was produced in the same manner as in Production Example 4, except that the content ratio of the husk (hull, lemma, and palea) of barley malt in the papermaking composition was changed to 25% by mass.

[0060] [Production Example 9] A pulp molded body 1 (Samples 37 to 42) was produced in the same manner as in Production Example 4, except that the content ratio of the husk (hull, lemma, and palea) of barley malt in the papermaking composition was changed to 0% by mass.

[0061] [Test Example 2] Buckling Strength Test 2 Regarding the pulp moldings 1 (Samples 16 to 42) manufactured in Production Examples 4 to 9, the buckling strength (N) was measured using a buckling strength testing apparatus (product name: AUTOGRAPH AGS-X, manufactured by Shimadzu Corporation).

[0062] As shown in Fig. 5, the buckling strength test in Test Example 2 was conducted by bringing the pressing part 11 of the buckling strength testing apparatus into contact with the concave part 4 of the pulp molding 1 from the back side and pushing it in, and measuring the strength when the rising part 41 of the concave part 4 buckled as the buckling strength (N). The results are shown in Table 2.

[0063]

Table 2

[0064] As shown in Table 2, the buckling strength of the pulp mold molded body 1 produced using a papermaking composition (Samples 16 to 35) containing 2.5 to 20% by mass of the glumes (hulls, lemma, and palea) of barley malt was confirmed to be equivalent to that of the pulp mold molded body produced using a papermaking composition (Samples 37 to 42) that does not contain the glumes (hulls, lemma, and palea) of barley malt (contains only cellulose fibers). The buckling strength of the pulp mold molded body 1 produced using a papermaking composition (Sample 36) containing 25% by mass of the glumes (hulls, lemma, and palea) of barley malt was lower than the buckling strength of the pulp mold molded body 1 produced using a papermaking composition (Samples 16 to 35) containing 2.5 to 20% by mass of the glumes (hulls, lemma, and palea) of barley malt. The value of the buckling strength of the pulp mold molded body 1 can vary depending on the shape of the pulp mold molded body 1 (more specifically, the shape of the accommodating portion 2 (the shape of the article (such as the cosmetic container 3, etc.) accommodated in the accommodating portion 2)), and also depends on the weight and shape of the article (cosmetic container 3) accommodated in the accommodating portion 2 (the shape of the accommodating portion 2 of the pulp mold molded body 1), etc. However, it was confirmed that a pulp mold molded body having a buckling strength sufficient for practical use can be produced even when using a papermaking composition having a content rate of the glumes (hulls, lemma, and palea) of barley malt of 25% by mass. Therefore, according to the papermaking composition containing the glumes (hulls, lemma, and palea) of barley malt and the pulp mold molded body produced therefrom, it is possible to contribute to the recycling of the glumes (hulls, lemma, and palea) of barley malt.

Explanation of Symbols

[0065] 1... Pulp mold molded body 10... Papermaking tank 11... Papermaking mold 12... Mold S... Slurry

Claims

1. Contains cereal glumes and cellulose fibers; A papermaking composition, characterized in that the content of cereal glumes is 25 mass% or less.

2. 2. The papermaking composition according to claim 1, wherein the content of cereal glumes is 20% by mass or less.

3. 2. The papermaking composition according to claim 1, wherein the content of cereal glumes is less than 20% by mass.

4. 4. The papermaking composition according to claim 1, wherein the cereal glume is malt husk.

5. 4. The papermaking composition according to claim 1, wherein the cellulose fibers are pulp.

6. 6. The paper-making composition according to claim 5, wherein the pulp is virgin pulp and / or recycled paper pulp.

7. 2. The papermaking composition according to claim 1, wherein the content of cereal glumes is 10% by mass or less.

8. 2. The papermaking composition according to claim 1, wherein the content of cereal glumes is 1 to 10% by mass.

9. A pulp molded product, which is produced by hot molding a pulp mold intermediate obtained by papermaking a slurry containing the papermaking composition according to any one of claims 1 to 3 using a papermaking mold.

10. A step of preparing a slurry containing the papermaking composition according to any one of claims 1 to 3; A step of producing a pulp mold intermediate by papermaking the papermaking composition from the slurry using a papermaking mold; a step of hot-molding the pulp molded intermediate body; A method for producing a pulp molded product, comprising:

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