JPH07231728A - Base paper for fruit bags - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a base paper for fruit bags, which can prevent the whitening phenomenon of the fruit bags due to external light and improve the appearance of coloring. [Structure] A base paper for fruit bags, which comprises 1 to 5% by weight of a coloring pigment composed of an organic pigment and a rouge in pulp fiber, and a blending ratio of the red roe to the organic pigment is 5 to 60% by weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base paper for fruit bags which is improved in order to improve the sugar content and appearance of white peach, and more particularly to a base paper for fruit bags which is effective in preventing whitening of the bags.

[0002]

2. Description of the Related Art Conventionally used fruit bag base papers include those made from newspapers, kraft papers, kraft papers with stripes, and the like. These focused on the protection of fruit from fungi and insect damage, and were not so effective in improving the sugar content and appearance and preventing the whitening of bags.

[0003]

In order to solve this problem, Japanese Patent Publication No. 4-3176 discloses that an organic pigment or an inorganic pigment of orange color has a refractive index of 1.55 to 1.55.
It contains the filler of 2.70 as a main component, and the light transmittance by the spectrophotometer is 0 to 400 at 400 to 500 nm.
At 5% and at 700 to 800 nm, 30 to 50% of base paper for fruit bags has been proposed and has achieved some results. However, although organic pigments can be vividly colored,
Especially when exposed to acid rain, fading was remarkable and it was unavoidable that a so-called whitening phenomenon occurred. When such a bleaching phenomenon occurs, not only the appearance of the obtained fruit is deteriorated, but also the ultraviolet ray blocking property of sunlight is lowered, and the growth properties such as sugar content of the fruit are deteriorated. Further, the bleaching phenomenon causes oxidative deterioration of the cellulose fibers themselves, which causes a problem of lowering the physical strength of the base paper. In addition, when an inorganic pigment is used in a base paper for fruits, a clear color cannot be obtained, which causes a problem in appearance. The present invention is intended to prevent the drawbacks of using organic pigments or inorganic pigments, which are used in the conventional base paper for fruit bags, by using a combination of organic pigments and inorganic pigments, that is The purpose of the present invention is to obtain a new base paper for fruit bags which eliminates the problem of discoloration while maintaining the vivid coloring property by neutralizing the oxidation product by the presence and suppressing the acceleration of oxidative deterioration of cellulose. It is a thing.

[0004]

SUMMARY OF THE INVENTION The outline of the present invention focuses on the simultaneous use of an organic pigment and an inorganic pigment, and in particular, a red pattern is selected from various inorganic pigments to A colored pigment having a weight ratio of 100: 5 to 60 was used as a coloring pigment, and the coloring pigment was used in an amount of 1 to pulp fiber.
The present invention provides a base paper for a fruit bag containing an added amount of -5% by weight, and in particular, has a refractive index of 1.55 to 2.70.
When the above-mentioned filler is blended, the base paper for fruit bags, which is more effective in preventing whitening, is provided.

The pulp fiber used in the present invention can be selected from NBKP, LBKP, NUKP, GP, recycled fiber, synthetic fiber and the like, but the fruit bag base paper facilitates bagging workability. Since it is necessary to have softness, LBKP and GP
Is preferably used. Also, among the above pulp, NUKP,
LUKP, GP, etc. are also effective in absorbing ultraviolet rays.

Examples of commercially available rouge used in the present invention include trade names NY-40 and NNY manufactured by Nippon Beni Kogyo Co., Ltd. and trade names YP-50SP manufactured by Tone Sangyo Co., Ltd. YP-200SB, trade name Bayferrox 3910 manufactured by Bayer Co., Ltd. may be mentioned, which is added in an amount of 5 to 60% by weight based on the organic pigment.

The organic pigment used in the present invention is preferably an orange organic pigment. Among the commercially available organic pigments, those which are preferably used are, for example, (yellow pigment) Yellow GL # 5 (red pigment) CamineFB manufactured by Mikuni Dye Co., Ltd., (yellow pigment) manufactured by Dainichiseika Kogyo Co., Ltd. Dp-2137 Yellow, (yellow pigment) Sandai Yellow GFP and Sandai DP Carmine FB manufactured by Sanyo Dye Co., Ltd. may be mentioned.

[0008] The coloring pigment itself has a poor fixing property to pulp fibers and does not match the color tone, so that it is necessary to use a fixing agent. Polyacrylamide or the like is used as the fixing agent, and is 0.03 to 0.08 with respect to pulp fibers.
Addition by weight% is preferable. In this case, if the content is less than 0.03% by weight, the effect of the fixing agent is insufficient, so that the retention of the pigment is deteriorated. On the contrary, if the content exceeds 0.08% by weight, the addition amount becomes too large and the pulp agglomerates to form become worse. Various fillers are added to the base paper for fruit bags of the present invention in order to improve the ability to block ultraviolet rays. The filler preferably has a refractive index of 1.55 to 2.70, and clay, talc, calcium carbonate, titanium dioxide and the like can be used. Among them, talc has a refractive index of 1.57 and is excellent because it does not change the color of the pigment. If the refractive index is higher than 2.70, the orange color becomes whitish and it is difficult to balance the transmitted light. Further, when the refractive index is less than 1.57, the transparency of the base paper is too good and the fruit inside is easily affected by ultraviolet rays, which is not preferable.

[0009]

In the present invention, 1 to 5% by weight of the color pigment composed of the organic pigment and the red peony is relative to the absolute dry amount of pulp fiber.
It is necessary to blend. In this case, if the amount is less than 1% by weight, the transmittance of external light is too high, and the ultraviolet rays are directly radiated to the fruits in the fruit bag, resulting in unnecessary coloring of white peaches and yellow peaches which should not be colored. Reduce value. On the other hand, when the amount exceeds 5% by weight, the coloring is too dark and the light transmittance is reduced particularly at 700 to 800 nm by a spectrophotometer, which impairs the growth of sugar content such as sugar content of the inside fruit. Furthermore, in the present invention, it is necessary that the amount of the valgare to be mixed with the organic pigment is 5 to 60% by weight. If it is less than 5% by weight, the fruit bag causes a whitening phenomenon due to external light, while if it exceeds 60% by weight, the clarity of the coloring of the organic pigment is deteriorated, resulting in poor appearance and light transmittance. And the growth of fruits such as sugar content decreases.

In the construction of the base paper of the present invention, the thickness and basis weight of the paper are important, but if they are made too large, the paper becomes more opaque, and the wavelength 7 required for the base paper for fruit bags is increased.
The transmittance in the range of 00 to 800 nm cannot reach 30% or more, resulting in poor light transmission. Also, if you reduce the thickness and basis weight,
In some cases, the light transmittance increases, and likewise, it may not fall within the range of 0 to 5% at the wavelength of 400 to 500 nm required for the fruit bag base paper. 50 at wavelengths of 700 to 800 nm
The transmittance is more than%, which is inappropriate. The thickness and the basis weight are 73 to 83 μ and the basis weight is 43 to 48 g / m in consideration of the strength of the paper, the bagging workability, the number of boxes of bag-making products, and the like.
² is preferred. Furthermore, the base paper for fruit bags of the present invention has a Gurley air permeability of 5 to improve the sugar content and appearance of the fruit.
It is preferably 25 seconds. Water repellency is an important characteristic of the base paper for fruit bags of the present invention. Generally, the period for bagging the growing fruits is 2 to 4 months. When the water-repellent effect of the bag disappears within 1-2 months, rain affects the fruits and deteriorates the quality. Further, there is a drawback that the paper becomes weak at the time of harvesting and it is difficult to harvest when harvesting each bag.
Therefore, it is preferable to add a water repellent to the base paper of the present invention. Examples of the water repellent include paraffin wax,
Examples thereof include copolymers of styrene or styrene derivatives and vinyl monomers, chlorinated paraffins, cobalt naphthenates, zirconium compounds, and alkyl ketene dimers. As a method of applying a water repellent to the base paper for fruit bags, it may be added to the pulp suspension and internally added to the paper, such as size press coating, calender coating, and impregnation on the surface of the paper. The method of giving may be good.

[0011]

EXAMPLES The present invention will be described below with reference to examples. All% in the examples represent% by weight. Example 1 For pulp formulation Was added (however, except for the valve stem, the solid content% by weight relative to the pulp fiber) to prepare a base paper having a paper thickness of 78 μ and a basis weight of 45 g / m ² . The beating degree of the pulp at this time is 50 ° S.
Performed at R. A water-repellent agent (olefin resin) was applied to this at 1.5 g / m ² to prepare a base paper for fruit bags of the present invention.

Embodiment 2 For pulp formulation Was added (however, except for the valve stem, the solid content% by weight relative to the pulp fiber), and a base paper having a paper thickness of 78 μ and a basis weight of 45 g / m ² was produced. The beating degree of pulp at this time is 51 ° SR.
It was done in. A water-repellent agent (olefin resin) was applied to this at 1.5 g / m ² to prepare a base paper for fruit bags of the present invention.

Embodiment 3 For pulp formulation Was added (however, except for the valve stem, the solid content% by weight relative to the pulp fiber), and a base paper having a paper thickness of 73 μ and a basis weight of 43 g / m ² was produced. The beating degree of pulp at this time is 55 ° SR.
It was done in. A water-repellent agent (olefin resin) was applied to this at 1.5 g / m ² to prepare a base paper for fruit bags of the present invention.

Example 4 For pulp formulation Was added (however, solid content% by weight relative to pulp fiber), and a base paper having a paper thickness of 83 μ and a basis weight of 48 g / m ² was produced. In addition,
The beating degree of the pulp at this time was 45 ° SR. A water-repellent agent (olefin resin) was applied to this at 1.5 g / m ² to prepare a base paper for fruit bags of the present invention.

Comparative Example 1 For pulp formulation Was added (however, except for the valve stem, the solid content% by weight relative to the pulp fiber) to produce a base paper having a paper thickness of 79 μ and a basis weight of 46 g / m ² . The beating degree of the pulp at this time is 50 ° S.
Performed at R. A water-repellent agent (olefin resin) was applied to this at 1.5 g / m ² to prepare a fruit bag base paper for comparison.

Comparative Example 2 For pulp formulation Was added (however, except for the rouge, the solid content% by weight relative to the pulp fiber) to produce a base paper having a paper thickness of 77 μ and a basis weight of 44 g / m ² . The beating degree of the pulp at this time is 53 ° S.
Performed at R. A water-repellent agent (olefin resin) was applied to this at 1.5 g / m ² to prepare a fruit bag base paper for comparison.

Example of use The fruit bags prepared by using the base papers of Examples 1 to 4 and Comparative Examples 1 and 2 were sacked on white peaches 30 days after flowering and 60 days later, a harvesting study was conducted to show the phenomenon of whitening of the base papers ( Table 1 shows the results of measuring the whiteness) and the color clarity. By the way, Table 1 shows the thickness, tensile strength, air permeability and size of the base paper after bagging.

[0018]

[Table 1]

As is clear from Table 1, the examples according to the present invention maintained a clear color without causing the whitening phenomenon while maintaining sufficient physical strength, whereas the comparative example 1 caused the whitening phenomenon. , And the tensile strength due to the deterioration of paper,
Wet tensile strength, air permeability, sizing decreased, and
In Comparative Example 2, the color clarity was poor, and the characteristics as a base paper for fruit bags were not satisfactory.

[0020]

EFFECTS OF THE INVENTION According to the present invention, a fruit bag having properties suitable as a fruit growth bag, and particularly capable of improving the sugar content and appearance of white peach and the like over conventional ones, which is particularly advantageous for preventing whitening. This is to provide a base paper.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Miyashita No.3 Somune-cho, Shizuoka-shi, Shizuoka Prefecture Tomagawa Paper Mill Co., Ltd. No. 3 No. 1 in the Paper Division of Tomoegawa Paper Co., Ltd.

Claims (2)

[Claims] 1. A fruit bag, characterized in that 1 to 5% by weight of a coloring pigment, in which the blending ratio of the organic pigment and the rouge is 100: 5 to 60 by weight, is blended with respect to the pulp fiber. Base paper 2. The base paper for fruit bags according to claim 1, further comprising a filler having a refractive index of 1.55 to 2.70.