JP4355283B2 - Mixing stick and spoon made of tableware paper - Google Patents

Description

The present invention relates to an agitation stick and spoon made of tableware, and more particularly to an agitation stick and spoon using paper for producing a paper agitation stick and spoon.

  Conventionally, a stirring stick has been used to stir coffee with added sugar or milk when drinking coffee or the like in a train such as a train. Since such a stirring stick is used to stir hot coffee or the like, it is required to have excellent water resistance and hot water resistance, and usually a plastic stick is used.

  Similarly, when eating ice cream, yogurt, jelly, etc., a spoon is used, and this spoon is required to have water resistance.

On the other hand, due to the recent increase in environmental awareness, as a substitute material for tableware such as plastic sticks and spoons, paper materials having improved water resistance and hot water resistance have been proposed (for example, Patent Document 1). reference).
JP 2003-79505 A (pages 2 and 3)

  However, in the above invention, a paper base material is impregnated with a synthetic resin or a synthetic resin film is laminated, and water resistance and heat resistance are not improved only by a paper material.

  Then, the main subject of this invention is providing the stick for stirring and spoon using the tableware paper which improved water resistance and hot water resistance.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The invention according to claim 1 is a stirring stick made of dish paper composed of a front surface layer, a back surface layer, and one or more middle layers, wherein ash content is detected from 0.1 to 10% from the middle layer. ash of the middle layer is configured to be detected higher than the respective ash surface layer and back layer, at the edge wick values, is a 0.015 g / cm ² or less, consisting of dishes sheet, characterized in that This is an agitation stick , and the edge wick value is that the paper is cut into a 2 cm × 20 cm piece of paper, a water-resistant tape is attached to the front and back sides of the piece of paper, and the water temperature is 80 ± 1 ° C. for 10 minutes. It is a numerical value of a test for determining the amount of water absorbed when immersed, and is a numerical value (g / g) determined by (weight after immersion (g) −weight before immersion (g)) / total area of the four peripheral end faces (cm ² ). cm ² ).

<Invention of Claim 2>
The invention according to claim 2 is the size according to the Cobb method of JIS P8140 in which the internal sizing agent is blended in an amount of 0.1 to 2% by weight (solid content conversion) with respect to the absolute dry weight of the pulp, and the water temperature is 80 ± 1 ° C. The stirring stick made of tableware paper according to claim 1, wherein the degree is 40 g / m ² or less.

<Invention of Claim 3>
A third aspect of the present invention is a stirring stick made of tableware according to the first or second aspect of the present invention, which is composed of laminated paper.

<Invention of Claim 4>
Invention of Claim 4 is the stirring stick which consists of the tableware paper of any one of Claim 1 thru | or 3 whose pulp used as a raw material is a chlorine-free bleached chemical pulp (ECF pulp).

<Invention of Claim 5>
The invention according to claim 5 is a spoon made of dish paper composed of a front surface layer, a back surface layer, and one or more middle layers, wherein ash is detected from 0.1 to 10% from the middle layer, A spoon made of dish paper, characterized in that the ash content of the middle layer is detected to be higher than the ash content of the front surface layer and the back surface layer, and the edge wick value is 0.015 g / cm ² or less. Yes, the edge wick value is when paper is cut into 2 cm x 20 cm pieces of paper, water-resistant tape is attached to the front and back sides of this piece of paper, and immersed in water at a water temperature of 80 ± 1 ° C for 10 minutes. is a numerical value of the test for determining the absorption of water, - (weight after immersion (g) weight before immersion (g)) / numerical values determined by the total area of the four circumferential end surface ^{(cm 2) (g / cm} 2) is there.

<Invention of Claim 6>
The invention according to claim 6 is the size according to the Cobb method of JIS P8140 in which the internally added sizing agent is blended in an amount of 0.1 to 2% by weight (solid content conversion) with respect to the absolute dry weight of the pulp, and the water temperature is 80 ± 1 ° C. The spoon made of tableware paper according to claim 5, wherein the degree is 40 g / m ² or less .

<Invention of Claim 7>
A seventh aspect of the present invention is a spoon made of tableware according to the fifth or sixth aspect, which is made of laminated paper .
<Invention of Claim 8>
Invention of Claim 8 is a spoon which consists of the tableware paper of any one of Claim 5 thru | or 7 whose pulp used as a raw material is a chlorine-free bleached chemical pulp (ECF pulp).

  According to the present invention, there are advantages that the water resistance and the hot water resistance can be improved only by the paper material.

Embodiments of the present invention will be described below.
<Base material>
The base material of the tableware paper which concerns on this invention uses pulp as the main raw material. Examples of the pulp raw material include hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft pulp (NUKP), hardwood sulfite pulp, coniferous sulfite pulp, and the like Kraft pulp chemically treated with pulp containing wood fibers as the main raw material, and Kraft pulp chemically treated with non-wood fibers such as kenaf, hemp, straw, and linter pulp, which are fiber raw materials other than wood. Pulp, ground pulp mechanically pulped chips, chemi-ground pulp mechanically pulped with chemicals added to wood or chips, or chips digested until soft, then pulped with refiner etc. Virgin pulp such as semi-chemical pulp, kraft pulp, semike Recycled pulp obtained from unprinted waste paper such as pulp, bleached pulp, milk-packed waste paper, coated paper, coated paper, white paper, white paper, medium white, etc. Etc. In addition, although these pulp raw materials may be used independently, you may mix and use 2 or more types.

Here, when using bleached pulp, it is preferable to use ECF pulp which is a chlorine-free bleached chemical pulp. Chlorine-free bleached chemical pulp is a chemical pulp produced without using molecular chlorine (Cl ₂ ), and ECF (Elementary Chlorine Free) pulp does not use molecular chlorine (Cl ₂ ), and does not use carbon dioxide. Pulp produced by bleaching with chlorine (ClO ₂ ). Since the ECF pulp has a low chloride ion content, there is an advantage that there is little risk that organic chlorine compounds such as dioxins are generated even by low-temperature incineration, resulting in a low environmental load.

  Further, the beating degree of the pulp is preferably in the range of 250 to 550 ml in Canadian standard freeness (CSF) based on JIS-P8121.

<Composition of tableware>
This tableware paper is formed by applying a PVA or the like to the surface with a calendar device or the like after being dried with a dryer or the like by internally adding a filler such as talc at the paper making stage. . The paper machine used for the tableware is not particularly limited, and various known paper machines such as a long net machine, a circular net machine, or a paperboard machine using a combination of both may be used. it can.

  The tableware paper of the present embodiment is a thick paper having a paper thickness of about 500 μm, and is generally formed as a paperboard made of multi-layered paper having three or more layers. By making a multi-layer paper, the formation is improved, and the composition and size of the raw material can be changed for each layer, and the productivity is increased. In the present embodiment, as shown in FIG. 1, intermediate layers m, m,... (Collectively referred to as “intermediate layer group M”, hereinafter the same) between the surface layer S and the back surface layer R. It has become a sandwiched form. As a matter of course, the middle layer m may be a single layer or a plurality of layers.

  Tableware formed by dish paper, such as a stirring stick or spoon, constitutes an end face portion of a stirring stick or spoon (that is, an end face portion of dish paper), particularly paper, when used for food or beverages with high moisture content. The phenomenon of swelling occurs in the middle layer group M, and therefore the hardness (rigidity) of the paper is lost due to the influence of absorbed moisture, making it difficult to use as a stirring stick or spoon. Therefore, in order for tableware paper to be sufficiently applied as a material for tableware, water resistance, hot water resistance, and rigidity that suppress absorption of moisture (including hot water) from the paper surface and its end surface are required. Therefore, the following will describe the degree of water resistance, hot water resistance, and rigidity required for the paper surface and the end surface of the tableware.

  First, the water resistance and hot water resistance of the paper surface are determined by the sizing degree according to the Cobb method of JIS P8140 that evaluates the sizing property by the amount of water permeating from the paper surface for a certain time.

  Here, according to JIS P8140, the temperature of the water used for the test is matched with the standard state at the time of the test, and the water temperature is 23 ± depending on the standard state of JIS P8111 (pretreatment of test paper) cited by JIS P8140. Although it is required that the temperature is 1 ° C., the dish paper according to the present invention is used for a mudler or the like such as hot coffee. The temperature was changed to ± 1 ° C., and other conditions were in accordance with JIS P8140. The reason for setting the water temperature at 80 ° C. is that the temperature when hot coffee or tea is poured into the cup is assumed. In general, the higher the water temperature, the larger the numerical value of the sizing degree. Therefore, if there is no problem at the maximum temperature (80 ° C.) that is expected to be used as dish paper, 80 ° C. or less, for example, cold water Even if the temperature is low, such as ice cream or ice cream, there is no problem in use as tableware. Therefore, if the hot water resistance is satisfied, the water resistance is substantially satisfied.

In the present invention, for water from the surface in water having a water temperature of 80 ± 1 ° C., the sizing degree according to the Cobb method of JIS P8140 based on the above conditions is preferably 40 g / m ² or less. This is because use of a sizing degree exceeding 40 g / m ² is not preferable because moisture absorption from the paper surface is large and the rigidity is impaired. As described above, if the sizing degree of the paper surface according to the JIS P8140 Cobb method in water with a water temperature of 80 ± 1 ° C. is 40 g / m ² or less, there is no problem with the water resistance of the paper surface.

The water resistance and hot water resistance of the end surface of the tableware paper are determined by the water absorption (edge wick test) from the end surface E of the four circumferences of the paper as shown in FIG.
Here, the edge wick test is to cut a paper into a 2 cm × 20 cm piece of paper, and attach a water-resistant tape to the front and back sides of the piece of paper and put it in water at a predetermined water temperature for 10 minutes. This is a test for determining the amount of water absorbed when immersed, and the edge wick value determined by this test is (weight after immersion (g) −weight before immersion (g)) / total area of the four-circumferential end faces (cm ² ) (g / cm ² ) In this edge wick test, i) a 2 cm × 20 cm piece of paper is cut, and ii) a water-resistant tape is attached to the front and back surfaces, and test pieces are formed so that water absorption from the front and back surfaces does not occur. Iii) All the test pieces are immersed, and the water absorption after 10 minutes of immersion is measured. In the edge wick test, in the case of a multi-layer paper made up of three or more layers of the front surface layer S, the back surface layer R, and the middle layer group M, the water absorption of the end surface E of the total surface layer S, back surface layer R, and middle layer group M The degree is measured.

  Here, the water temperature is required to be 23 ± 1 ° C. according to the standard state of JIS P8111 (pretreatment of the test paper) as well as the water resistance and hot water resistance of the above paper surface. Since the paper is also used for stirring sticks such as hot coffee, hot water resistance is required, so the water temperature condition of the test condition is changed to 80 ± 1 ° C., and other conditions are according to JIS P8140. It was supposed to be. Moreover, if the hot water resistance of the end face is satisfied, the water resistance is substantially satisfied as described above.

It is preferable that the edge wick value is 0.015 g / cm ² or less with respect to water from the end face E of the four circumferences of the paper. This is because use of an edge wick value of more than 0.015 g / cm ² is not preferable because moisture absorption from the end face is large and rigidity is impaired. As described above, if the edge wick value in water having a water temperature of 80 ± 1 ° C. is 0.015 g / cm ² or less, there is no problem with the water resistance of the paper end face.

  Next, the rigidity required for the food paper according to the present invention will be described. This stiffness is an index that evaluates the stiffness of paper (the strength of how much it does not bend against the bending force). It is also called “stiffness” and “waist”, and is evaluated by the stiffness test of JIS P8125. It is what is done. The temperature is required to be 23 ± 1 ° C. according to the standard condition of JIS P8111 (pretreatment of test paper). Like the water resistance and hot water resistance described above, the dish paper according to the present invention is hot. Since it is also used for agitation sticks such as coffee, it requires hot water, so the temperature of the test conditions is changed to a water temperature of 80 ± 1 ° C, and the water temperature is 80 ± 1 ° C for 5 minutes. After soaking, the test was performed after lightly pinching with filter paper to remove water adhering to the paper. Other conditions were set according to JIS P8125. The JIS P8125 Taber stiffness at a water temperature of 80 ± 1 ° C. is preferably 14 mN · m or more in length and 4 mN · m or more in width, because it can maintain sufficient rigidity as dish paper even in hot water. .

<Combination>
In the above, the water resistance, hot water resistance, and the degree of rigidity required for the paper surface and the end surface of the tableware paper have been described, but in order to realize these water resistance, hot water resistance, and the degree of rigidity, concrete paper is used. It is necessary to mix a sizing agent and filler with the material to suppress moisture absorption. Therefore, a suitable ratio of the sizing agent and filler to be mixed with the paper material will be described below.

First, regarding the sizing agent, known sizing agents such as a saponified rosin sizing agent, a rosin emulsion sizing agent, an alkyl ketene dimer, and an alkenyl succinic anhydride can be used as an internal sizing agent. This internal sizing agent is blended in the surface layer S, the back surface layer R, and the middle layer group M so that the total amount is 0.1 to 2% by weight (in terms of solid content) with respect to the absolute dry weight of the pulp. Is done. If it is less than 0.1% by weight based on the absolute dry weight of the pulp, there is no size effect, and if it exceeds 2% by weight, the size effect reaches its peak, and even if it is added more than this, it becomes useless. This sizing agent mainly has a function of suppressing moisture absorption from the paper surface of the tableware. In addition, a sulfuric acid band is mix | blended suitably with the surface layer S, the back surface layer R, and the middle layer group M with an internal additive size agent. Further, in the paper making process, by applying polyvinyl alcohol (PVA, the same applies hereinafter) to the outer surface (paper surface) of the surface layer S and the back surface layer R as surface sizing, absorption of moisture from the paper surface of tableware paper is suppressed. Strengthen. The PVA coating is preferably performed so that the coating amount is about 0.1 to ² g / m ² .

  Next, the filler will be described. Generally, fillers are internally added for the purpose of increasing opacity, smoothness, whiteness, and printability. However, in the present invention, in addition to these purposes, gaps between pulp fibers are filled to increase the density. However, it is blended and added internally for the purpose of suppressing moisture absorption from the end face of the tableware paper. That is, the paper surface is flat and the pulp is dense, and a size effect by a surface sizing agent such as PVA can also be expected. However, the paper end surface is rough due to the fibers being distorted by cutting, and water can easily enter. Yes. In particular, in the paper having a large basis weight, the surface sizing agent does not penetrate into the inside of the paper layer as compared with the paper having a small basis weight, so that the water absorption from the end surface tends to increase. Therefore, in the present invention, the filler is internally added for the main purpose of filling the voids of the pulp on the end face with the filler to suppress water absorption. Although it is possible to suppress the water absorption with only the sizing agent, in that case, it is necessary to increase the amount of the sizing agent. If the amount of the sizing agent is increased, the foreign matter caused by the sizing agent is generated. The problem that it becomes easy to do arises. Therefore, it does not deal with increasing the addition amount of the sizing agent, but suppresses the absorption of moisture from the end face by adding the filler.

  As the filler used, talc, clay, calcium carbonate, white carbon, pentonite, aluminum hydroxide, titanium dioxide and the like can be used as the inorganic filler, and upearl (urea resin) can be used as the organic filler. . These fillers are preferably blended so as to detect 0.1 to 10% as ash. If it is less than 0.1%, there is no effect of suppressing water absorption, and if it exceeds 10%, the fiber-to-fiber bond of the pulp is reduced, and the tensile strength, surface strength, and rigidity are lowered, which is not preferable.

  Although it is a layer to which a filler is internally added, it is preferably blended only in the middle layer group M (specifically, at least one of the middle layers m, m,...). This is because the middle layer group M is a layer having a larger area ratio of the sheet end surface than the front surface layer S and the back surface layer R, and is most effective in preventing water absorption from the end surface. Although it does not prevent the filler from being added to the surface layer S and the back layer R, the surface layer S and the back layer R can be sufficiently sized by an internally added sizing agent, etc. If added, the surface strength is lowered, so it is preferable not to blend.

  In addition to the filler, if the material can fill the gaps between the pulp fibers and increase the density, fibers such as hot melt fibers are mixed and melted with the heat of a dryer to fill the gaps between the fibers. You may do it.

  In the present embodiment, an example of making a multi-layer structure of three or more layers is shown, but this does not exclude a case where a single layer or two paper layers are formed. Moreover, when it consists of two or more paper layers, the formation method may not be based on paper making but may be formed by bonding.

<Example>
Next, examples of the present invention will be described. In the following examples, unless otherwise specified, “parts” and “%” mean “parts by mass” and “% by mass”, respectively, and “kg / t” means addition per pulp ton. It means quantity (kg). In addition, while absolutely dry kg refers to the solid content that does not include moisture, solid kg refers to the weight (kg) including moisture.

Using a circular multi-layer paper machine, the sheets were combined in a five-layer structure of a front surface layer, a middle layer (three layers) and a back surface (front surface) layer. The basis weight of each layer surface layer 50 g / m ^2, middle 295 g / m ^2, and a back layer 50 g / m ^2, and a basis weight of 395 g / m ^2. Below, the compounding of a surface layer, a middle layer (3 layers), and a back surface (surface) layer is shown.

(1) Surface layer and back surface layer NBKP (Canadian Standard Freeness (CSF) 400 ml) 25%, LBKP (400 ml) 75%, sulfuric acid band 15 kg / t, paper strength enhancer, (Harima Kasei Co., Ltd. Hermide B15) 15 kg / t , Sizing agent (AL1344 made by Starlight PMC) 2%

(2) Middle layer NBKP (Canadian Standard Freeness (CSF) 450 ml) 60%, LBKP (400 ml) 40%, sulfuric acid band 15 kg / t, paper strength enhancer, (Harima Kasei Corporation Hermide B15) 15 kg / t, sizing agent ( Starlight PMC AL1344) 2%, Talc 30kg / t

Then, the outer surface of the surface layer and back layer, PVA2% aqueous solution (Nippon Synthetic Chemical Industry Co., Gosenol N300), and a coating weight per one side 1.5 g / m ² (double-sided total 3.0 g / m ² ) To obtain a paper sheet.

  As shown in Table 1, for each test piece formed by changing the blending amount of the internal sizing agent and the amount of talc in the middle layer, the middle layer ash content, the front and back layer ash content, the edge wick value, and the JIS P8140 Cobb method The sizing degree (hereinafter referred to as “cobb sizing degree”) and the Taber stiffness based on JIS P8125 (hereinafter referred to as “Taber stiffness”) were examined. In addition, middle layer ash and front and back layer ash were measured by immersing the test piece in water and separating it into three layers of the front layer, middle layer and back layer, and the front and back layer ash was the average value of the surface layer ash and back layer ash. did.

  In addition, the above edge wick values and bump sizes are shown not only when the water temperature condition is 80 ± 1 ° C. but also when the water temperature is 23 ± 1 ° C. as a standard state. The Taber stiffness was measured after the test piece was immersed in water (23 ± 1 ° C. and 80 ± 1 ° C.) for 5 minutes, and then the paper was lightly pinched with filter paper to remove the attached water.

It is sectional drawing for demonstrating the structure of the tableware paper which concerns on this invention. It is explanatory drawing which shows the relationship between the surface of a tableware paper, and an end surface.

  E ... end face, S ... surface layer, R ... back layer, m ... middle layer, M ... middle layer group.

Claims (8)

A stirring stick made of dish paper composed of a front surface layer, a back surface layer, and one or more middle layers,
0.1 to 10% of ash is detected from the middle layer, the ash of the middle layer is configured to be detected higher than the ash content of the front surface layer and the back layer,
The edge wick value was 0.015 g / cm ² or less.
A stirring stick made of table paper.
Edge wick value: The amount of water absorbed when paper is cut into a 2 cm x 20 cm piece of paper, water-resistant tape is attached to the front and back of this piece of paper, and immersed in water at a water temperature of 80 ± 1 ° C for 10 minutes. is a numerical value of the test for determining the, - numerical obtained (weight after immersion (g) weight before immersion (g)) / total area of four circumferential end surface ^{(cm 2) (g / cm} 2). The internal sizing agent is blended in an amount of 0.1 to 2% by weight (in terms of solid content) with respect to the absolute dry weight of the pulp, and the sizing degree according to the JIS P8140 Cobb method in water with a water temperature of 80 ± 1 ° C is 40 g / m ² or less. A stirring stick comprising the tableware paper according to claim 1. The stick for stirring which consists of tableware paper of Claim 1 or 2 comprised from a paper-making. The stirring stick which consists of the tableware paper of any one of Claims 1 thru | or 3 whose pulp used as a raw material is a chlorine-free bleached chemical pulp (ECF pulp). A spoon made of tableware made of a surface layer, a back layer, and one or more middle layers,
0.1 to 10% of ash is detected from the middle layer, the ash of the middle layer is configured to be detected higher than the ash content of the front surface layer and the back layer,
0.015 g / cm at the edge wick value ² The following was assumed,
Spoon made of table paper.
Edge wick value: The amount of water absorbed when paper is cut into a 2 cm x 20 cm piece of paper, water-resistant tape is attached to the front and back of this piece of paper, and immersed in water at a water temperature of 80 ± 1 ° C for 10 minutes. (Weight after immersion (g) −weight before immersion (g)) / total area of the four peripheral end faces (cm ² ) (G / cm) ² ). The internal additive sizing agent is blended in an amount of 0.1 to 2% by weight (in terms of solid content) based on the absolute dry weight of the pulp, and the sizing degree according to the JIS P8140 Cobb method in water at a water temperature of 80 ± 1 ° C. ² A spoon made of tableware according to claim 5, wherein: A spoon made of dish paper according to claim 5 or 6, wherein the spoon is made of laminated paper. The spoon which consists of the tableware paper of any one of Claim 5 thru | or 7 whose pulp used as a raw material is a chlorine-free bleached chemical pulp (ECF pulp).

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