JP2007154322A - Reinforcing paper or decorative paper and paper bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain reinforcing paper or decorative paper having excellent strength and a paper bag having excellent strength at paper bag break. <P>SOLUTION: The reinforcing paper 1a has a tensile energy absorption in a 45 degree direction to a papermaking diameter of ≥400J/m<SP>2</SP>. The reinforcing paper 1a comprises, for example, extensible paper obtained by passing a paper sheet between a pair of press rolls of a shrink imparting apparatus which is equipped with a pair of press rolls of a hard roll equipped with a plurality of channels at fixed intervals in the peripheral direction on the peripheral surface of the roll and a soft roll having a flat surface and in which the circumferential speed of the hard roll or the soft roll is lower than that of the other so that the paper sheet is pressurized and shrunk. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reinforcing paper that is used to reinforce a sewing machine portion, a bottom edge portion, and a valve opening of a paper bag, and a makeup that is a paper to be attached to the outside of the bottom edge portion of a single bottom bag or a double bottom bag. The present invention relates to paper and a paper bag using at least one of these reinforcing paper and decorative paper.

  This type of reinforcing paper and decorative paper is affixed to the lower end portion of the paper bag or both the upper end portion and the lower end portion to reinforce this portion.

  Conventionally, stretched paper such as crepe paper has been used as the reinforcing paper. This crepe paper is wrinkled in a crepe-like shape and is known as “fir paper” in hand-made Japanese paper. It has the properties that the paper is soft and has a large elongation and surface area. In particular, it has been traditionally manufactured as a high-quality paper because it has a Japanese-style aesthetic appearance, and is a paper that has been widely used and referred to as crepe paper in mechanical papermaking. By using such a crepe paper as a reinforcing paper, an attempt is made to reinforce the seam portion and prevent leakage of contents.

Stretched paper is manufactured by a method such as kulpack processing or creping processing. Further, in recent years, as a method for producing stretched paper having higher stretch properties, a corrugated pre-molded form, a roll made of a hard material and having ribs on its surface and rotating at a high speed, and soft There has been proposed a technique in which a longitudinal and lateral elongation characteristic is simultaneously imparted by contracting between a pair of rolls made of a material and having a smooth surface and rotating at a low speed (Patent Document 1).
Japanese National Patent Publication No. 11-509276

  By the way, all the stretched papers manufactured by the above method are provided with stretch characteristics by giving shrinkage grooves to the base paper. However, when the shrinkage grooves are given to the base paper, they were used as reinforcing paper or decorative paper. However, the strength required at the time is not considered at all, and the bag breaking strength of the paper bag having the reinforcing paper or the decorative paper may be a problem.

  Also, when trying to use stretched paper as reinforcing paper or decorative paper, it is often manufactured from pulp made from overseas conifers that have long fiber lengths and excellent strength. There is a problem with availability and there is a problem with availability. On the other hand, when pulp made from domestic materials is used, there is no problem in availability, but because the fiber length is short, it is difficult to obtain sufficient strength as reinforcing paper or decorative paper, and these reinforcing paper and decorative paper are included. There was a problem that the bag breaking strength of the paper bag might be insufficient.

  In recent years, many easy-open bags (single-folded bags) have been used in Japan. The easy open bag is a fold-up end of the tube, which is covered with reinforcing paper in a U-shaped cross-sectional view, and when the bottom is molded, this cut tape is fixed to the back of the reinforcing paper with a polypropylene cut tape. In addition to making cuts on both sides of the paper, and affixing a reinforcing paper, it can be easily opened by tearing the reinforcing paper of the cut tape portion. Reinforcement using pulp made from overseas conifers with a long fiber length even when using pulp made from domestic materials that are easy to obtain due to the fact that many such easy-open bags have been used. Reinforced paper having strength properties equal to or higher than that of paper has been demanded.

  This invention is made | formed in view of such a situation, The place made into the objective is providing the paper bag excellent in the reinforcing paper or decorative paper excellent in intensity | strength, and the bag breaking strength.

  Therefore, as a result of intensive studies, the present inventors have found that the amount of tensile energy absorbed in the direction of 45 degrees with respect to the paper making direction has a large correlation with the broken bag, that is, the strength of the paper bag. The invention has been completed.

That is, the reinforcing paper or decorative paper according to the invention described in claim 1 is characterized in that the amount of tensile energy absorbed in the direction of 45 degrees with respect to the paper making direction is 400 J / m ² or more.

The reinforcing paper or decorative paper according to the invention described in claim 2 is characterized in that, in the reinforcing paper or decorative paper described in claim 1, the basis weight is in the range of 80 to 150 g / m ² .

  The reinforcing paper or decorative paper according to the invention described in claim 3 is the reinforcing paper or decorative paper according to claim 1 or 2, wherein a groove along the circumferential direction is formed on the roll peripheral surface at a predetermined interval in the roll width direction. A pair of press rolls each comprising a plurality of hard rolls and a soft roll having a flat surface are provided, and the circumference of the other roll with respect to the circumferential speed of one of the hard roll and the soft roll. It is made of stretched paper obtained by pressurizing and shrinking the paper sheet by passing the paper sheet between the pair of press rolls of the shrinkage imparting device configured to rotate at a low speed. It is characterized by.

  A paper bag according to a fourth aspect of the invention is characterized in that the reinforcing paper or decorative paper according to the first, second, or third aspect is used.

According to the first aspect of the present invention, since the tensile energy absorption amount in the direction of 45 degrees with respect to the paper making direction is 400 J / m ² or more, it is possible to obtain reinforcing paper and decorative paper having excellent strength. Further, the strength can be obtained regardless of the fiber length of the raw material.

According to invention of Claim 2, 3, since basic weight is the range of 80-150 g / m < ² >, while being excellent in intensity | strength, it can obtain a reinforced paper and decorative paper favorable in terms of workability and cost. it can.

  According to the invention described in claim 4, since the reinforcing paper or decorative paper described in claim 1, 2 or 3 is used, a paper bag having excellent bag breaking strength can be obtained.

  Hereinafter, an example of the best mode for carrying out the present invention will be described. 1 is a bottom end view showing an example of a paper bag using the reinforcing paper according to the present invention, FIG. 2 is a bottom end view showing another example of the paper bag using the reinforcing paper according to the present invention, and FIG. 3 is related to the present invention. 4 is a plan view showing an example of a paper bag using decorative paper, FIG. 4 is a cross-sectional view showing an example of an embodiment of reinforcing paper or decorative paper according to the present invention, and FIGS. It is a figure used in order to explain the reason which paid its attention to the amount of tensile energy absorption of a 45 degree direction.

  The form of the paper bag using the reinforcing paper or decorative paper of the present invention is not particularly limited, but it is suitably used for, for example, a glue kraft paper bag defined by JIS Z 1531 or the like. A specific example of the paper bag will be described with reference to FIGS. 1 and 2 show a paper bag 2 using the reinforcing paper 1a of the present invention. The paper bag 2 shown in FIG. 1 is a double folded bag (JIS Z 1531 B-2) with folds and reinforcing paper having a folded portion 4 having a lower end 3 and an upper end (not shown) folded once. The reinforcing paper 1a is affixed to the bottom 5 formed by bending the lower end 3 once. Also, the paper bag 2 shown in FIG. 2 is a double-folded bag (JIS Z 1531 A-5 ′) with folds and reinforcing paper having a folded portion 7 in which the lower end portion 6 is bent twice. 1a is affixed to the bottom 8 formed by bending the lower end 6 twice.

  FIG. 3 shows a paper bag 2 using the decorative paper 1b of the present invention. The paper bag 2 shown in FIG. 3 is a pleatless double bottom bag (JIS Z 1531 B-2), and the decorative paper 1b is attached to the bottom cover portion 11 of the upper end portion 9 and the lower end portion 10. .

Next, the reinforcing paper 1a and the decorative paper 1b will be described with reference to FIG. The base paper 12 constituting the reinforcing paper 1a and the decorative paper 1b is a stretched paper provided with a shrink groove 13 and has a tensile energy absorption amount of 400 J / m ² or more in a 45 degree direction with respect to the paper making direction. If the amount of tensile energy absorbed in the direction of 45 degrees with respect to the paper making direction is less than 400 J / m ² , the strength is insufficient, and when used in a paper bag, the paper bag breaks due to impact when dropped. . In addition, it is preferable that the tensile energy absorption amount of the 45 degree direction with respect to the papermaking direction is 1700 J / m ² or less. When the tensile energy absorption amount exceeds 1700 J / m ² , the stiffness of the reinforcing paper 1a or the decorative paper 1b is lowered, causing a problem in workability when manufacturing a paper bag.

  Here, the reason why attention is paid to the tensile energy absorption amount in the direction of 45 degrees with respect to the paper making direction will be described with reference to FIGS. FIG. 5 and FIG. 6 show the paper bag 2 of FIG. 3 filled with powder (not shown) as the contents and having the decorative paper 1b. Here, the paper bag 2 will be described as an example. .

As shown in FIG. 5, when the paper bag 2 is dropped (horizontal drop) in a direction in which the front surface 2a and the back surface 2b are in the vertical direction, the paper-making direction is a rectangular shape whose parallel direction is the long side. Breaking energy is applied to the decorative paper 1b in a direction perpendicular to the paper making direction (direction indicated by an arrow in the figure). On the other hand, as shown in FIG. 6, when the paper bag 2 falls in a direction in which both side surfaces 2 c and 2 d are in the vertical direction (side-face fall), the powder as a filling material is caused by the impact of the fall. And a large breaking energy is applied to the decorative paper 1b in an oblique direction (direction indicated by an arrow in the figure) with respect to the paper making direction. Accordingly, when the paper bag 2 is dropped in the direction shown in FIG. 6, it is non-uniform, and it is considered that the decorative paper 1b is likely to be broken because the breaking energy is applied intensively in part. It is done. Therefore, the inventor of the present application pays attention to the tensile energy absorption amount in the 45 degree direction with respect to the paper making direction, and as a result of intensive studies, the tensile energy absorption amount in the 45 degree direction with respect to the paper making direction is 400 J / m ² or more. It has been found that reinforced paper and decorative paper can solve the intended problem.

  The base paper 12 of the reinforcing paper 1a or the decorative paper 1b is not particularly limited with respect to the material thereof, but is a paper having a composition of 100% natural pulp due to waste disposal and environmental load problems due to global environmental problems. It is preferable that

It said reinforcing sheet 1a or decorative paper 1b is preferably a basis weight in the range of ^{80g / m 2 ~150g / m 2} . If the basis weight is less than 80 g / m ² , the strength may be insufficient, and if the basis weight exceeds 150 g / m ² , workability and cost are difficult.

  The stretched paper used as the reinforcing paper 1a or the decorative paper 1b preferably has a tensile breaking elongation specified in JIS P 8113 of 20% or more in the vertical direction and 8% or more in the horizontal direction.

  As such a stretched paper, natural pulp that has been moderately beaten, or a paper sheet made of a raw material in which one or more synthetic fibers are mixed, is described in, for example, JP-T-11-509276. This is preferable because stretched paper produced by shrinkage treatment using such a shrinkage imparting device has high tensile breaking elongation in both the longitudinal and transverse directions, resulting in high tensile energy absorption. Can be used.

  Further, as stretched paper, stretched paper obtained by the method described in Japanese Patent Application Laid-Open No. 2004-3071 has a high tensile energy absorption amount, which can be suitably used. Here, the stretched paper will be specifically described. This stretched paper is made of natural pulp that has been moderately beaten, or wet paper in which the moisture content of a paper sheet made from a raw material in which one or more synthetic fibers are mixed is adjusted to 20 to 50%. A pair of press rolls (not shown) consisting of a hard roll (not shown) provided with grooves along the direction at predetermined intervals in the width direction of the roll and a soft roll (not shown) having a flat roll peripheral surface The paper roll is shrunk by passing through a shrinkage imparting device (not shown) that rotates under the pressure with the circumferential speed of the soft roll being slower than the circumferential speed of the hard roll. Obtained by drying. In the shrinkage imparting apparatus, the grooves along the circumferential direction of the hard roll have a width of 0.3 mm to 1.5 mm and a depth of 0.1 mm at intervals (pitch) of 0.4 mm to 3.0 mm in the roll width direction. It is preferably 1 to 2.0 mm. The linear pressure between the hard roll and the soft roll is preferably in the range of 100 to 1000 N / cm, and the peripheral speed of the soft roll is in the range of 50 to 95% with respect to the peripheral speed of the hard roll. It is preferable.

  The natural pulp is not particularly limited as long as it is a normal papermaking raw material such as wood pulp using conifers or hardwoods, non-wood pulp such as kenaf or bagasse, waste paper pulp, but wood pulp from the viewpoint of versatility. Is preferred.

  Examples of the synthetic fiber mixed with the natural pulp include polyvinyl alcohol (for example, vinylon), polyamide (for example, nylon), polyethylene, polyester, and the like. In consideration, 5% by weight or more and less than 30% by weight is preferable, and the kind thereof is appropriately selected so as to satisfy the characteristics required as a substrate.

  The reinforcing paper 1a or the decorative paper 1b preferably has a Canadian standard freeness (CSF) of pulp used in the range of 300 to 450 ml. If the CSF is higher than 450 ml, a stretched paper with sufficient tensile strength cannot be obtained, and if the CSF is lower than 300 ml, the air permeability becomes too high, so the air permeability becomes worse when processed into a paper bag, Fillability is significantly reduced.

  In the reinforcing paper 1a or the decorative paper 1b, the tensile strength is desirably 4 kN / m or more in the longitudinal direction. In addition, in order to obtain such tensile strength, a paper strength improver such as polyacrylamide, starch, modified starch, vegetable gum, carboxymethylcellulose, or the like is used in the stretched paper used in the reinforcing paper 1a or the decorative paper 1b. Can do.

EXAMPLES Next, although an Example and a comparative example demonstrate this invention in detail, this invention is not limited by this.
In each example and comparative example, a rosin-based sizing agent (0.5% to pulp) and wet paper were added to a 400 ml Canadian standard freeness (CSF) pulp containing 5: 5 hardwood kraft pulp and softwood kraft pulp. A wet paper is produced with a long net paper machine with a strength enhancer (polyamideamine / epichlorohydrin, 0.1% to pulp) and a paper strength agent (polyacrylamide, 0.5% to pulp). A reinforced paper was obtained by applying shrinkage grooves with a shrinkage groove applying device. The shrink groove imparting device is configured to include a pair of press rolls composed of a grooved metal roll (hard roll) and a smooth rubber roll (soft roll) shown in the examples and comparative examples, compared to the metal roll, The base paper was nipped in the shrinking groove applying device in which the peripheral speed of the rubber roll was reduced by about 15%, and then dried with a multi-cylinder cylinder dryer to obtain reinforcing paper. The following measurement and evaluation were performed on the reinforcing paper and the paper bag obtained as described later using the reinforcing paper.

<Measuring method of tensile energy absorption of reinforcing paper>
The measurement was performed by the method specified in JIS P 8113.

<Measuring method of opening of paper bag using reinforcing paper>
FIG. 7 is a plan view showing a part of the paper bag 2 used in Examples and Comparative Examples, and FIG. 8 is an end view taken along line AA of FIG. The paper bag 2 is a JIS Z 1531 pleated / reinforced paper double folded bag (A-5 ′) having a folded portion 7 in which the lower end portion 6 is bent twice. This paper bag 2 was obtained as follows using the reinforcing paper obtained in Examples and Comparative Examples. That is, first, a 4 mm wide cut tape 14 made of polypropylene is applied, and a vinyl acetate adhesive is applied to the reinforcing paper 1 a having 5 mm cuts 15 at four positions 5 mm away from both sides of the cut tape 14. (Trade name “CNS350” manufactured by Konishi Co., Ltd.) was applied at an application speed of 50 m / min so as to be completely dry to give an application amount of 2 g / m ^2. Or after affixing to a substantially J shape, it crimps | bonds by a linear pressure of 8 kg / cm with a roll. Thereafter, the reinforcing paper 1a and the bottom 8 of the paper bag 2 were bonded together by leaving to dry at 23 ° C. and 50 RH% for 5 days.

  Cut along the cut tape 14 to a width of 60 mm so that the cut tape 14 is centered, and fix the cut tape 14 and the tip of the paper bag 2 to the upper and lower chucks of a tensile strength tester (tensile meter). Then, the weight when pulled upward at a speed of 100 mm / min was taken as the measured value (kgf / 15 mm). The value obtained by converting the measured value to N / m was defined as the adhesive strength of the reinforcing paper 1a.

<Drop test method>
Kraft paper having a basis weight of 84 g / ^{m 2} as a 3-layer, was processed to the length 838Mm, pleated-reinforcing sheet with pieces twofold Beam bags JIS Z 1531 of width 420mm (A-5 '), the lower end The paper sheets 2 (see FIGS. 7 and 8) having the reinforcing paper 1a on the bottom 8 were obtained by pasting the reinforcing papers of Examples and Comparative Examples on the bottom. This paper bag 2 was filled with 30 kg of sugar and subjected to a drop test defined in JIS Z 0217. Side dropping was repeated up to 3 times from a drop height of 1.2 m, and the number of drops when the bag was broken was taken as the test result.

<Processability>
Evaluation of workability refers to workability in the case of continuously producing a paper bag to which a reinforcing paper is stuck, that is, practical evaluation such as ease of folding of the reinforcing paper and paper stiffness. If the stiffness of the reinforced paper is too high, it will return to its original shape even if it is glued, it will not be stable even if it is glued, and if the paper is too weak, production will not be stable after gluing, in which case it will be difficult to process as a reinforced paper. . Therefore, in Examples and Comparative Examples, a paper bag is manufactured with Easybotmer made by Neurong, and there is no problem at all regarding the manufacturing evaluation level when attaching the reinforcing paper of Examples and Comparative Examples. ”, Those that can be manufactured are indicated by“ ◯ ”, those that are sometimes defective are indicated by“ Δ ”, and those that are considerably defective are indicated by“ X ”.

[Example 1]
FIG. 9 is a partially enlarged cross-sectional view of the grooved metal roll of the shrink groove applying device used for manufacturing the reinforcing paper. The grooved metal roll 16 has an interval O in the roll width direction of the groove portion 17 of 0.75 mm, a depth P of the groove portion 17 from the opening portion of 0.4 mm, and a flat portion length Q of the peak portion 18 of 0.1 mm. The shrinkage groove 13 (see FIG. 4) is applied to the base paper 12 with such a metal roll 16 and a smooth rubber roll (not shown), smoothed with a steel calender, and has a basis weight of 120 g / m ² and a thickness. Is 191 μm, the tensile breaking elongation specified in JIS P 8113 is 16.7% in the machine direction, 8.7% in the transverse direction, and the amount of tensile energy absorbed in the 45 degree direction with respect to the paper making direction is 471 J / m ² Paper 1a was obtained.
The above reinforcing paper 1a was processed into a small roll of 4000 mm having a width of 90 mm, and a paper bag 2 was manufactured using Easybotomer made by Neurong.

  Table 1 shows the measurement results and evaluation of the opening property, bag breaking strength, and workability of the obtained reinforcing paper 1a and paper bag 2. As is clear from Table 1, the obtained reinforcing paper 1 and paper bag 2 had good opening properties and bag breaking strength, had no problem with workability, and were good overall.

[Example 2]
Shrinkage grooves 13 are formed on the base paper 12 with the same grooved metal roll 16 (see FIG. 9) and smooth rubber roll (not shown) as in Example 1, and the basis weight is 140 g / m ² after smoothing with a steel calender. , The thickness is 264 μm, the tensile breaking elongation specified in JIS P 8113 is 16.7% in the machine direction, 9.1% in the transverse direction, and the absorbed amount of tensile energy in the 45 degree direction with respect to the paper making direction is 523 J / m. ² of reinforcing paper 1a was obtained.
The above reinforcing paper 1a was processed into a small roll of 4000 mm having a width of 90 mm, and a paper bag 2 was manufactured using Easybotomer made by Neurong.

  Table 1 shows the measurement results and evaluation of the opening property, bag breaking strength, and workability of the obtained reinforcing paper 1a and paper bag 2. As is clear from Table 1, the obtained reinforcing paper 1a and the paper bag 2 have good openability and bag breaking strength, and can be manufactured in terms of workability. there were.

[Example 3]
Shrinkage grooves 13 are formed on the base paper 12 with the same grooved metal roll 16 (see FIG. 9) and a smooth rubber roll (not shown) as in Example 1, and the basis weight is 100 g / m ² after smoothing with a steel calender. The tensile breaking elongation specified in JIS P 8113 is 16.8% in the machine direction, 9.3% in the transverse direction, and the tensile energy absorption in the 45 degree direction with respect to the paper making direction is 422 J / m. ² of reinforcing paper 1a was obtained.
The above reinforcing paper 1a was processed into a small roll of 4000 mm having a width of 90 mm, and a paper bag 2 was manufactured using Easybotomer made by Neurong.

  Table 1 shows the measurement results and evaluation of the opening property, bag breaking strength, and workability of the obtained reinforcing paper 1a and paper bag 2. As is clear from Table 1, the obtained reinforcing paper 1a and the paper bag 2 have good openability and bag breaking strength, and can be manufactured in terms of workability. there were.

[Example 4]
Shrinkage grooves 13 are formed on the base paper 12 with the same grooved metal roll 16 (see FIG. 9) and a smooth rubber roll (not shown) as in Example 1, and the basis weight is 199 g / m ² by smoothing with a steel calender. , Thickness is 380 μm, tensile elongation at break defined in JIS P 8113 is 17.0% in the longitudinal direction, 9.0% in the transverse direction, and the tensile energy absorption in the 45 degree direction with respect to the paper making direction is 743 J / m. ² of reinforcing paper 1a was obtained.
The above reinforcing paper 1a was processed into a small roll of 4000 mm having a width of 90 mm, and a paper bag 2 was manufactured using Easybotomer made by Neurong.

  Table 1 shows the measurement results and evaluation of the opening property, bag breaking strength, and workability of the obtained reinforcing paper 1a and paper bag 2. As is clear from Table 1, the obtained reinforcing paper 1a and the paper bag 2 had good bag breaking strength, but the openability was poor and the workability was considerably poor. Although it was somewhat poor, sufficient bag breaking strength could be obtained.

[Comparative Example 1]
Shrinkage grooves 13 are formed on the base paper 12 with the same grooved metal roll 16 (see FIG. 9) and smooth rubber roll (not shown) as in Example 1, and the basis weight is 75 g / m ² by smoothing with a steel calender. The thickness at 130 μm, the tensile elongation at break specified in JIS P 8113 is 14.8% in the machine direction, 9.4% in the transverse direction, and the tensile energy absorption in the 45 ° direction with respect to the paper making direction is 300 J / m. ^Two reinforced papers were obtained.
The above-mentioned reinforcing paper was processed into a small roll of 4000 mm having a width of 90 mm, and a paper bag was manufactured using Easybotmer made by Neurong.

  Table 1 shows the measurement results and evaluations regarding the opening property, bag breaking strength, and processability of the obtained reinforcing paper and paper bag. As is clear from Table 1, the obtained reinforcing paper had good openability, but the bag breaking strength was inferior, the workability was sometimes poor, and it was poor overall. .

[Comparative Example 2]
Reinforcing paper and a paper bag were produced in the same manner as in Example 1 except that Kurpac paper was used as the reinforcing paper. The reinforcing paper has a basis weight of 83 g / m ² , a thickness of 125 μm, a tensile breaking elongation specified in JIS P 8113 of 7.9% in the vertical direction, 6.1% in the horizontal direction, and 45 in the paper making direction. The tensile energy absorption amount in the direction of degree was 194 J / m ² .

Table 1 shows the measurement results and evaluations regarding the opening property, bag breaking strength, and processability of the obtained reinforcing paper and paper bag. As is clear from Table 1, the obtained reinforcing paper had good openability, but poor bag breaking strength, sometimes poor workability, and it was slightly poor or poor overall. It was.

The bottom end view which shows an example of the paper bag using the reinforcement paper which concerns on this invention. The bottom part end view which shows the other example of the paper bag using the reinforcement paper which concerns on this invention. The top view which shows an example of the paper bag using the decorative paper which concerns on this invention. Sectional drawing which shows an example of embodiment of the reinforcing paper or decorative paper which concerns on this invention. The figure used in order to demonstrate the reason which paid its attention to the tensile energy absorption amount of a 45 degree direction with respect to the papermaking direction in this invention. The figure used in order to demonstrate the reason which paid its attention to the tensile energy absorption amount of a 45 degree direction with respect to the papermaking direction in this invention. The top view which shows a part of paper bag used in the Example and the comparative example. FIG. 8 is an end view taken along line AA in FIG. 7. The partial expanded sectional view of the metal roll with a groove | channel of the shrink groove | channel provision apparatus used for manufacture of a reinforcement paper in an Example and a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Reinforcement paper 1b Decorative paper 2 Paper bag 2a Front surface 2b Back surface 2c, 2d Side surface 3 Lower end portion 4 Folding portion 5 Bottom portion 6 Lower end portion 7 Folding portion 8 Bottom portion 9 Upper end portion 10 Lower end portion 11 Bottom edge portion 12 Base paper 13 Shrink groove 14 Cut Tape 15 cut 16 grooved metal roll 17 groove 18 crest O groove interval in the roll width direction P depth of groove from opening Q flat portion length of crest

Claims (4)

Reinforced paper or decorative paper, characterized in that the amount of tensile energy absorbed in the direction of 45 degrees with respect to the papermaking direction is 400 J / m ² or more. The reinforcing paper or decorative paper according to claim 1, wherein the basis weight is in the range of 80 to 150 g / m ² .   Provided with a pair of press rolls comprising a hard roll provided with a plurality of grooves along the circumferential direction on the roll peripheral surface at predetermined intervals in the roll width direction, and a soft roll having a flat surface, the hard roll and the By passing a paper sheet between the pair of press rolls of the shrinkage imparting device configured to rotate at a lower peripheral speed of the other roll with respect to the peripheral speed of one of the soft rolls, The reinforcing paper or decorative paper according to claim 1 or 2, comprising stretched paper obtained by pressurizing and shrinking a paper sheet.   A paper bag using the reinforcing paper or decorative paper according to claim 1.

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