JP2003105698A - Original paper for fruit bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a whitening preventing effect on an original paper for fruit bags, since a sufficiently improved original paper for fruit bags is still required although following technologies have been reported for improving whitening effect on the original paper for fruit bags: an organic pigment or an inorganic pigment of orange color, and a filler having a refractive index of 1.55-2.70 are compounded into pulp; or an organic pigment and an inorganic pigment of a ratio of 100:5 to 60 are compounded into a base material, and further a filler having a refractive index of 1.55-2.70 is compounded. SOLUTION: A pigment-containing wet paper is dried by bringing only one side of the paper into close contact with a heated planished drier to obtain an original paper for fruit bags. The pigment comprises a mixture of an organic pigment and an inorganic pigment which have been compounded at a ratio of 1:1-2, and the pigment is compounded into pulp at a ratio of 1-5 wt.% of the pulp fiber. The surface of the paper which has been brought into close contact with the heated planished drier has a glossiness of >=25% according to JIS P-8142, a smoothness of >=100 seconds according to JIS P-8119 and an air permeability of <=15 seconds according to JIS P-8117.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fruit bag for promoting the ripening degree of pears or the like to a certain degree, which protects fruits from insects, birds, direct sunlight and wind, and in particular, The present invention relates to a fruit bag base paper that is effective in preventing fruit bags from whitening. 2. Description of the Related Art Conventionally used fruit bag base papers are made of a material having excellent air permeability and light transmittance, such as non-woven fabric, newsprint, kraft paper, and paper wrapping. These materials are
Processed into a fruit bag and put on the fruit, it prevents fruit disease, insect damage, bird damage, wind damage, and has the effect of promoting moderate sunlight transmission, moisturizing inside the bag, and promoting the growth of fruit by the heat retaining effect. ing. [0003] However, the conventional fruit bag base paper causes a whitening phenomenon due to repeated exposure to ultraviolet rays, rainfall, pesticide spraying, and the like, which inhibits sunlight transmission and hinders fruit growth. ing. [0004] As a measure for improving the whitening phenomenon, Japanese Patent Publication No. 4-3176 discloses an organic or inorganic pigment having an orange color and a refractive index of 1.55-1.5 in pulp.
It contains a 2.70 filler as a main component, and has a light transmittance of 400 to 500 nm of 0 to 400 nm by a spectrophotometer.
For 5% and 700 to 800 nm, 30 to 50% of the base paper for fruit has been proposed and has been successfully produced. Japanese Patent Application Laid-Open No. 7-231728 discloses that an organic pigment and an inorganic pigment are
It is blended with the base material at a ratio of 0: 5 to 60, and further has a refractive index of 1.
The technology of the fruit bag base paper further containing 55 to 2.70 filler is introduced. Although the fruit bag is effective in improving the whitening phenomenon, the refractive index of the pigment and the use of organic pigments and inorganic pigments are improved. The countermeasures depending on the composition and the like are still insufficient in effect, and further improvement is required for prevention of whitening. SUMMARY OF THE INVENTION The present inventors have developed a fruit manufactured using a so-called Yankee dryer type paper machine, in which only one side of a wet paper containing a pigment is dried while being brought into close contact with a heated mirror-surface dryer. In the sack base paper, the pigment is 1 to 5% by weight with respect to the pulp fiber in a mixing ratio of an organic pigment and an inorganic pigment of 1 to 1 to 2 and the JIS P of the surface adhered to the heating mirror surface dryer. Glossiness of -8142 is 25
% Or more, the smoothness based on JIS P-8119 is 100 seconds or more, and the above problem can be solved by adjusting the air permeability according to the measurement method of JIS P-8117 to 15 seconds or less. Thus, the present invention has been completed. DETAILED DESCRIPTION OF THE INVENTION The fiber material used for the base paper in the present invention can be selectively used from pulp and fiber such as NBKP, LBKP, NUKP, GP, recycled fiber and synthetic fiber. Fruit sack base paper is not only used for fruit packaging but also in terms of workability in agricultural work, it is required to have a flexible and strong quality, so chemical pulp and deinked waste paper pulp obtained from softwood and hardwood are preferably used. used. These chemical pulp and mechanical pulp can be used alone or in an appropriate mixture in an unbleached or bleached pulp state, or in an unbeaten or beaten pulp state. In some cases, 100% recycled pulp may be used. The apparatus according to the present invention for drying only one side of a wet paper containing a pigment by heating it to a mirror-surface dryer is a paper-making machine in which the dryer for drying the wet paper after the paper-making is a mirror-dryer, a so-called Yankee dryer. The type of the wire part and the press part are not particularly limited. In addition, a device having a structure in which an auxiliary drying device such as a cylindrical dryer or an infrared drying device is installed as a pre-dryer before the Yankee dryer and as an after-dryer can also be used later. Further, preferably, the glossiness of the glossy surface can be additionally increased in the range of about 3 to 16% by passing the base paper dried with the dryer through a soft calender, and finally the glossy surface becomes 25 to 25%. A fruit sack base paper having a gloss of about 38% can be obtained. [0009] The soft calendar that can be used in the present invention is:
One metal roll and one elastic roll are combined, and at least one fruit bag base paper is placed between the rolls so that the glossy surface of the fruit bag base paper contacts the metal roll.
By passing the paper, the glossiness of the glossy surface can be further increased. As the metal roll, a chilled roll, an alloy chilled roll, a steel roll, and a metal roll having a hard chromium-plated roll surface can be used. on the other hand,
The elastic roll is a roll provided with an elastic film such as a polyacrylate resin or a phenol resin on the surface. Examples of the elastic film include natural rubber, styrene rubber, nitrile rubber, chloroprene rubber, chlorosulfonated ethylene rubber, butyl rubber, and polysulfide. Rubber, silicone rubber, fluorine rubber, urethane rubber, aromatic polyamide resin, polyimide resin,
In addition to various resins such as polyether resin, polyester resin, polycarbonate resin, epoxy resin, phenol resin, urethane resin, heat-resistant thermosetting resin, various fibers such as cotton, paper, wool, tetron, nylon, and mixtures thereof. Can be used. Particularly preferably, the Shore D hardness of the elastic roll (according to ASTM standard D-2240) is from 80 to 9
It is preferably in the range of 6 degrees, preferably 85 to 95 degrees. If the Shore D hardness is less than 80 degrees, the nip width becomes too wide, making it difficult for the glossiness of the paper to increase, and furthermore, the friction heat increases and the roll surface temperature rises. Is easily damaged. on the other hand,
If the Shore D hardness is higher than 96 degrees, it will be close to the hardness of the metal roll, and it will be no different from the use of the conventional on-machine calender, the air permeability will increase, and if the air permeability exceeds 15 seconds, it will be later The paraffin impregnation at the time of the bag-making process to be described is poor, and may not be suitable for fruit bag use. [0011] In producing the fruit bag base paper of the present invention, the raw material of cellulose pulp is made by a conventional method.
A wet paper having a water content of 30 to 45% by weight, preferably 35 to 40% by weight is prepared. If the moisture content of the wet paper is less than 30% by weight, the wet paper will not sufficiently adhere to the mirror surface of the Yankee dryer, and the glossiness of the glossy surface will be reduced and poor drying will occur. On the other hand, when the moisture content of the wet paper exceeds 45% by weight, the drying load of the Yankee dryer increases, and the papermaking speed decreases. To reduce wet paper moisture, a pre-dryer can be installed before the Yankee dryer.However, without installing a pre-dryer, the wire part and press part of the paper machine are strengthened and wet paper moisture is removed. Can also be reduced. A wet paper having a predetermined water content is pressed against a mirror surface of a Yankee dryer and dried to obtain a wet paper having a water content of usually 12 to 12.
A fruit sack base paper having a gloss of about 22% is obtained. The glossiness of the glossy surface given by the Yankee dryer is 1
When the content is less than 2%, in order to obtain a fruit bag base paper having a glossy gloss of 25% or more in the final product, the conditions for surface treatment with a soft calender need to be considerably strict. This is not preferable because there is a possibility that the air permeability may increase. The moisture content of the fruit bag base paper after drying with a Yankee dryer is desirably 3.5 to 9.0% by weight, preferably 4.0 to 8.0% by weight. When the water content of the fruit bag base paper is less than 3.5% by weight, the glossiness does not increase even when subjected to soft calendering, and it is difficult to obtain the soft calendering effect. On the other hand, if the moisture content of the fruit bag base paper exceeds 9.0% by weight, uneven drying and wrinkles are likely to occur in the Yankee dryer, which tends to cause whitening and quality deterioration. The single gloss paper obtained by drying with a Yankee dryer is then subjected to a soft calender treatment. By this treatment, the glossy glossiness of the fruit bag base paper can be further increased in the range of about 3 to 16%. The application of the glossiness by the soft calendering treatment can be adjusted by appropriately selecting conditions such as a calendering nip pressure, a roll temperature, a speed, and the number of treatments. The soft calender used in the present invention can be used either on-machine or off-machine. Further, the paper can be passed through the soft calendar twice or more as necessary. [0015] In a conventional calendering apparatus comprising only a combination of metal rolls,
The processing linear pressure is about 1.0 to 50 kg / cm, and the adjustment range is narrow. In contrast, in the soft calender usable in the present invention, the elastic roll is distorted when pressurized, and the actual nip width becomes large. 3.0-500k as processing linear pressure
g / cm and the adjustment range can be widened. The glossiness of the surface brought into close contact with the heated mirror surface dryer after the soft calender treatment is preferably 25% to 35%. When the glossiness of the glossy surface is less than 25%, a whitening phenomenon is likely to occur, and it is difficult to increase the glossiness to 40% or more, and the smoothness and air permeability of the raw fruit paper tend to decrease. Is not preferred. The smoothness of the surface of the fruit bag base paper which is brought into close contact with the heating mirror surface dryer is preferably 100 seconds or more, and more preferably in the range of 110 seconds to 150 seconds. Smoothness is 100
If the time is less than seconds, the whitening phenomenon is likely to occur, and it is not suitable as a fruit bag base paper. The smoothness can be adjusted by appropriately selecting conditions such as a nip pressure of a soft calender, a roll temperature, a speed, and the number of treatments.The surface properties are improved while suppressing the density unevenness of the fruit bag base paper, and the uniformity of light is improved. Transmission can be obtained. In the fruit bag base paper of the present invention, it is necessary to mix the organic pigment and the inorganic pigment in a mixing ratio of 1: 1 to 2 to 1 to 5% by weight based on the pulp fiber. The compounding ratio of the organic pigment and the inorganic pigment is from 1: 1 to 2
, The whitening can be suppressed suitably. The mechanism by which the occurrence of the whitening phenomenon can be suppressed by setting the pigment compounding ratio is not clear, but the reflection of light on the contact surface of the Yankee dryer, the scattering of light on the non-contact surface of the Yankee dryer, the compounded organic It is presumed that the refraction of light by the pigment and the inorganic pigment enhances the synergistic effect. This scattering and refraction of light is considered to be equivalent to the effect of making the whole room feel brighter in a window having a shoji than in a window made of transparent glass, and the fruit bag base paper of the present invention was used. The reason why the growth of the fruit covered with the fruit bag is good is considered to be due to the above effect. In the present invention, by blending various pigments, there is also an effect of improving the ability to block ultraviolet rays. As the pigment used in the present invention, various commonly used inorganic pigments and organic pigments can be used. Specifically, the inorganic pigment has a refractive index of 1.
Those having a range of 55 to 2.70 are preferable. Refractive index 2.70
Higher inorganic pigments have a white tint in orange color, making it difficult to balance transmitted light. Further, inorganic pigments having a refractive index of less than 1.57 are not preferred because the transparency of the base paper becomes excessively high and the fruits inside are easily affected by ultraviolet rays. On the other hand, the organic pigment used in the present invention is preferably an orange organic pigment. Among the commercially available organic pigments, those preferably used include, for example, Yellow GL # 5 (yellow pigment) manufactured by Mikuni Pigment Co., Ltd.
(Red pigment) CamineFB, (Yellow pigment) Dp-2137 Yellow manufactured by Dainichi Seika Kogyo Co., Ltd., (Yellow pigment) Sundai Yellow GF manufactured by Sanyo Pigment Co., Ltd.
P, Sandai DP Carmine FB, and organic pigments such as polystyrene and urea-formaldehyde resin are preferably used. Both organic pigments and inorganic pigments may be colored or colored as required. The coloring pigment itself has poor fixability to pulp fibers and makes the color unsuitable, so that it is necessary to use a fixing agent. A yield improving agent or the like is used as the fixing agent, and it is preferable to add 0.03 to 0.08% by weight to the pulp fiber. In this case, if the amount is less than 0.03% by weight, the effect of the fixing agent is insufficient, so that the retention of the pigment is deteriorated. If the amount exceeds 0.08% by weight, on the other hand, the added amount is too large and the pulp is agglomerated, Gets worse. The fruit bag base paper of the present invention may further contain, if necessary, a surfactant, an antifoaming agent, a thickener, a waterproofing agent, a dispersant, an ultraviolet absorber, an antioxidant, an antistatic agent, and an ink. Auxiliary agents such as fixing agents, dye fixing agents, fluorescent dyes, colored dyes, lubricants, deodorants, deodorants, antibacterial agents and the like can also be added. Particularly, in the present invention, it is preferable to add 1.4 to 1.8% by weight of a paper strength enhancer for fixing the pigment and increasing the moisture resistance strength. When the paper strength enhancer is 1.4% by weight or less, the wet paper strength is reduced, and when the paper strength enhancer is 1.8% by weight or more, the texture deteriorates. Further, the fruit bag base paper of the present invention is preferably imparted with water repellency, and can be impregnated with paraffin when performing bag making from the fruit bag base paper. EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. Unless otherwise specified, “parts” and “%” described below mean “parts by weight” and “% by weight”, respectively. The soft calender used in Examples and Comparative Examples was an elastic roll having a Shore D hardness of 94 degrees (resin elastic cover: manufactured by Kyoyo) and a Shore hardness of 87 degrees (JIS B).
-7776). Example 1 NBKP was used as a raw material pulp.
(CSF 300cc) 50 parts, LBKP (CSF 2
80 cc) 50 parts of pulp slurry, 0.2% of dry paper strength agent, 1% of coloring pigment having a 1: 1 mixing ratio of organic pigment and inorganic pigment, 1.3% of sizing agent, sulfate band After adding 3.0% and 1.6% of wet paper strength agent, using a Yankee dryer type paper machine (papermaking speed 300 m / min), the wet paper moisture at the inlet of the Yankee dryer was 40%, and the papermaking speed was 350 m / min. A single-sided glossy paper was produced. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. The nip pressure of the soft calender is 3.0 kg / cm, the metal roll is arranged as a bottom roll, the temperature on the metal roll surface is 150 ° C., and 400 m / min so that the glossy surface of the single-sided paper is in contact with the metal roll. To obtain a fruit bag base paper. (Example 2) As raw pulp, NUKP
(CSF 300cc) 50 parts, LUKP (CSF 2
80 cc) 50 parts of a pulp slurry, 0.2% of a dry paper strength agent, 5% of a coloring pigment having a mixing ratio of an organic pigment and an inorganic pigment of 1: 2, 1.3% of a sizing agent, and a sulfate band After adding 3.0% and 1.6% of wet paper strength agent, using a Yankee dryer type paper machine (papermaking speed 300 m / min), the wet paper moisture at the inlet of the Yankee dryer was 40%, and the papermaking speed was 350 m / min. A single-sided glossy paper was produced. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. The nip pressure of the soft calender is 500 kg / cm, the metal roll is arranged as the bottom roll, the temperature on the metal roll surface is 110 ° C, and the paper is passed at 400 m / min so that the glossy surface of the single-sided paper is in contact with the metal roll. Paper was obtained to obtain a fruit bag base paper. Example 3 As raw pulp, NUKP
(CSF 300cc) 35 parts, LUKP (CSF 2
80 cc) of 5 parts and DIP (CSF 300 cc) of 60 parts in a pulp slurry having a dry paper strength enhancer of 0.1 part.
2%, 3% of a coloring pigment having a compounding ratio of an organic pigment and an inorganic pigment of 1: 2, 1.3% of a sizing agent, 3.0% of a sulfuric acid band,
1.6% of wet paper strength agent was added, and using a Yankee dryer-type paper machine (papermaking speed 300 m / min), the wet paper moisture at the inlet of the Yankee dryer was 40% and the papermaking speed was 350 m / min.
A piece of glazed paper was made as a part. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. The nip pressure of the soft calender is 300 kg / cm, the metal roll is arranged as a bottom roll, the temperature on the metal roll surface is set to 110 ° C., and the glossy surface of the single gloss paper is brought into contact with the metal roll.
The paper was passed at 0 m / min to obtain a fruit bag base paper. Example 4 As raw pulp, DIP
(CSF 300 cc) 100 parts of a pulp slurry, 0.2% of a dry paper strength agent, 4% of a coloring pigment having a mixing ratio of an organic pigment and an inorganic pigment of 1: 2, and a sizing agent of 1.3.
%, Sulfuric acid band 3.0%, and wet paper strength agent 1.6% were added, and a Yankee dryer type paper machine (papermaking speed 300 m /
Minutes) to reduce the wet paper moisture at the entrance of the Yankee dryer to 4
A single gloss paper was produced at 0% and a papermaking speed of 350 m / min. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. Nip pressure of soft calender is 400kg
/ Cm, the metal roll is arranged as a bottom roll, the temperature on the metal roll surface is 120 ° C., and the paper is passed at 400 m / min so that the glossy surface of the single-sided paper is in contact with the metal roll to obtain a fruit bag base paper. Was. (Comparative Example 1) As raw pulp, NUKP
(CSF 300cc) 50 parts, LUKP (CSF 2
80 cc) 50 parts of pulp slurry, 0.2% of dry paper strength agent, 3% of coloring pigment having a compounding ratio of organic pigment and inorganic pigment of 1: 0.8, 1.3% of sizing agent,
A sulfuric acid band (3.0%) and a wet paper strength agent (1.6%) were added. Using a Yankee dryer type paper machine (paper making speed: 300 m / min), the wet paper moisture at the Yankee dryer inlet was reduced to 40%.
A single gloss paper was produced at a papermaking speed of 350 m / min. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. The nip pressure of the soft calender is 350kg / c
m, the metal roll was arranged as a bottom roll, the temperature on the metal roll surface was 110 ° C., and the paper was passed at 400 m / min so that the glossy surface of the single-sided paper was in contact with the metal roll to obtain a fruit bag base paper. . Comparative Example 2 NBKP was used as a raw material pulp.
(CSF 300cc) 50 parts, LBKP (CSF 2
80 cc) 50 parts of a pulp slurry, 0.2% of a dry paper strength agent, 0.5% of a coloring pigment having a mixing ratio of an organic pigment and an inorganic pigment of 1: 3, 1.3% of a sizing agent,
A sulfuric acid band (3.0%) and a wet paper strength agent (1.6%) were added. Using a Yankee dryer type paper machine (paper making speed: 300 m / min), the wet paper moisture at the Yankee dryer inlet was reduced to 40%.
A single gloss paper was produced at a papermaking speed of 350 m / min. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. Nip pressure of soft calender is 100kg / c
m, the metal roll was arranged as a bottom roll, the temperature on the metal roll surface was 110 ° C., and the paper was passed at 400 m / min so that the glossy surface of the single-sided paper was in contact with the metal roll to obtain a fruit bag base paper. . (Comparative Example 3) As raw pulp, NUKP
(CSF 300cc) 50 parts, LUKP (CSF 2
80 cc) 50 parts of a pulp slurry, 0.2% of a dry paper strength agent, 0.5% of a coloring pigment having a mixing ratio of an organic pigment and an inorganic pigment of 1: 1.5, and a sizing agent of 1.3.
%, Sulfuric acid band 3.0%, and wet paper strength agent 1.6% were added, and a Yankee dryer type paper machine (papermaking speed 300 m /
Minutes) to reduce the wet paper moisture at the entrance of the Yankee dryer to 4
A single gloss paper was produced at 0% and a papermaking speed of 350 m / min. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. Nip pressure of soft calender is 300kg
/ Cm, the metal roll is arranged as a bottom roll, the temperature on the metal roll surface is 120 ° C., and the paper is passed at 400 m / min so that the glossy surface of the single-sided paper is in contact with the metal roll to obtain a fruit bag base paper. Was. (Comparative Example 4) As raw pulp, NUKP
(CSF 300cc) 35 parts, LUKP (CSF 2
80 cc) of 5 parts and DIP (CSF 300 cc) of 60 parts in a pulp slurry having a dry paper strength enhancer of 0.1 part.
2%, 7% of a coloring pigment having a mixing ratio of an organic pigment and an inorganic pigment of 1: 3, 1.3% of a sizing agent, 3.0% of a sulfuric acid band,
1.6% of wet paper strength agent was added, and using a Yankee dryer-type paper machine (papermaking speed 300 m / min), the wet paper moisture at the inlet of the Yankee dryer was 40% and the papermaking speed was 350 m / min.
A piece of glazed paper was made as a part. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. The nip pressure of the soft calender is 3 kg / cm, the metal roll is arranged as the bottom roll, the temperature on the metal roll surface is 110 ° C.,
400m so that the glossy surface of the single gloss paper touches the metal roll
Per minute to obtain a fruit bag base paper. Comparative Example 5 NBKP was used as a raw material pulp.
(CSF 300cc) 35 parts, LBKP (CSF 2
80 cc) of 5 parts and DIP (CSF 300 cc) of 60 parts in a pulp slurry having a dry paper strength enhancer of 0.1 part.
2%, 5% of a coloring pigment having a compounding ratio of an organic pigment and an inorganic pigment of 1: 1.5, 1.3% of a sizing agent, 3.0% of a sulfuric acid band
% And a wet paper strength agent 1.6%, and using a Yankee dryer type paper machine (papermaking speed 300 m / min), the wet paper moisture at the inlet of the Yankee dryer is 40% and the papermaking speed is 350
A single gloss paper was made at m / min. This single gloss paper was passed through a soft calender once and subjected to pressure treatment. The nip pressure of the soft calender is 600 kg / cm, the metal roll is arranged as the bottom roll, and the temperature on the metal roll surface is 150
° C and the paper was passed at 400 m / min so that the glossy side of the single gloss paper was in contact with the metal roll to obtain a fruit bag base paper. Comparative Example 6 LBKP was used as a raw material pulp.
(CSF 280 cc) 100 parts of a pulp slurry, 0.2% of a dry paper strength enhancer, 5% of a coloring pigment having a mixing ratio of an organic pigment and an inorganic pigment of 1: 1.5, 1.3% of a sizing agent, A sulfuric acid band (3.0%) and a wet paper strength agent (1.6%) were added, and a Yankee dryer type paper machine (papermaking speed 300
m / min), the wet paper moisture at the inlet of the Yankee dryer was 40%, and the papermaking speed was 350 m / min to produce a base paper for fruit bags. [Table 1] [Evaluation Method] A weather resistance test was performed using a xenon weather meter (WEL-45AX-HH- manufactured by Suga Test Instruments).
BEC, irradiance 30 W / m ² ), water spraying using chlorine water containing chlorine 0.2 ppm, ultraviolet irradiation 50 minutes,
Watering was repeated for 10 minutes, and the degree of fading of the sample was confirmed at 50 hours, 100 hours, and 150 hours of the test. The environment inside the weather meter was a temperature of 65 ° C and a humidity of 9
Performed at 5%. As a result of the indoor weather resistance test and the evaluation of the weather resistance of 10 types of fruit bag base papers including the sample in which the bleaching phenomenon actually occurred by actually putting the bag on the fruit and using it outdoors, The whitening phenomenon of the base paper showed a clear correlation. Examples 1 to 4 and Comparative Examples 1 to 6 were subjected to comparative tests by the above-mentioned weather resistance test. As a result, Examples 1-4 were 1
The color remained even after 50 hours and was good, and Comparative Examples 1 to 3 and 6 faded after 150 hours. In Comparative Examples 2 and 3, the amount of the coloring pigment was small, and in Comparative Example 4, the amount of the inorganic pigment was large.
Comparative Example 5 was good in both whitening phenomenon and color clarity.
It had high air permeability and was unsuitable as a fruit bag base paper. As described above, in the present invention, a predetermined pigment is blended with only one side of a wet paper containing a pigment by using a fruit bag base paper dried by closely contacting a heating mirror surface dryer. ,
By having the smoothness and the air permeability, it is possible to produce a fruit bag base paper that hardly causes a whitening phenomenon.

Claims (1)

Claims 1. In a fruit bag base paper in which only one side of a wet paper containing a pigment is brought into close contact with a heating mirror dryer and dried, the pigment comprises an organic pigment and an inorganic pigment in a mixing ratio of 1: 1 to 5% by weight based on the pulp fiber at a ratio of 1 to 2 and JIS P-8142 of the surface closely adhered to the heating mirror surface dryer
Gloss according to JIS P-811
9 based on JIS P-
A base paper for fruit bags, wherein the air permeability according to the measuring method of 8117 is 15 seconds or less.