JPS58152421A - Fruit bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved fruit bag for improving the sugar content and appearance of fruit.

BACKGROUND ART In fruit tree cultivation in a hot and humid climate like Japan, pests and diseases often occur, and chemical control using pesticides and the like is widely used to control them. However, in the cultivation process, it is necessary to spray various pesticides several times or more, and in some cases, spraying pesticides can significantly reduce the marketability of the fruit, or long-term spraying of pesticides can cause This has caused various problems such as the emergence of resistant bacteria and insects. On the other hand, for a long time, methods have been developed to protect fruits by physically shielding them from pathogens and pests without resorting to chemical control. That is, bagging, which covers the fruit with a paper bag, has been practiced. In addition to controlling pests and diseases, this marsupial cultivation is also effective in improving the appearance of fruits, greatly contributing to increasing commercial value. , pears, peaches, grapes, persimmons, etc.). For example, in the marsupial cultivation of pears, it has been found to be effective in controlling the damage caused by pear beetles, controlling black spot disease, and preventing the occurrence of red bruises. The same is true for apples, and it has been found to be effective in controlling damage caused by silver beetles, black spot disease, fruit splitting, and rusty fruit, and the appearance, which is related to marketability, is significantly improved. Due to labor shortages in rural areas and to reduce production costs, some types and varieties of fruit trees have changed to bagless cultivation, but the use of fruit bags not only reduces the number of times pesticides are sprayed. It has various advantages, such as being able to accurately avoid damage from secondary pathogens and insect pests that parasitize fruits, and also being able to produce fruits with high added value.

With the improvement of dietary habits in recent years, fruit cultivation has changed from the conventional cultivation systems and cultivars aimed at high-yield production.
A shift in cultivation systems and the introduction of varieties that produce high value-added quality are being attempted, and the trend is shifting from quantitative production to qualitative production. Considering the conditions, marsupial cultivation is a useful cultivation method.From this point of view, improvements in the structure of fruit bags used in marsupial cultivation, the quality of paper used for fruit bags, the color of the paper, and the use of pesticides in fruit bags. Development of coating agents, water repellents, and water repellents have been made to improve rain resistance.However, in the fruit bags that have been used conventionally, moisture generated from the fruit's breathing and water vapor in the atmosphere can cause the outside of the fruit bag to leak. This results in constant high humidity, which causes stains on the fruit surface due to moisture damage, promotes the growth of pathogenic microorganisms, and lowers the sugar content.
The present inventors focused on the microclimate surrounding the fruit inside the bag, especially the moisture environment, and conducted intensive research to eliminate overhumidity inside the bag and obtain a fruit bag that can produce high-quality fruit. The present inventors have discovered that the object can be achieved by using a fruit bag containing a water-insoluble superabsorbent polymer, or by inserting the fruit bag into the fruit bag, and have completed the present invention. That is, the present invention provides a fruit bag using a water-insoluble super absorbent polymer.

The superabsorbent polymer according to the present invention is a substance that is insoluble in water, highly hygroscopic, absorbs a large amount of water when in contact with water, and has a water absorption capacity of 30 times or more its own weight. For example,
．． Starch-polyacrylonitrile graft copolymer disclosed in Japanese Patent Publication No. 43395, cross-linked polyalkylene oxide disclosed in Japanese Patent Publication No. 51-39672, Japanese Patent Publication No. 53
-Saponified vinyl varnish and ethylenically unsaturated carboxylic acid copolymer disclosed in Japanese Patent Publication No. 13495, 1983-
Self-crosslinking polyacrylate obtained by the reverse phase suspension polymerization method disclosed in JP-A No. 30710, JP-A-54-200
No. 93 discloses a reaction product of a polyvinyl alcohol polymer and a cyclic anhydride, JP-A-55-84304
Examples include the polyacrylate crosslinked product disclosed in the above publication. Various inorganic substances are known as moisture absorbing agents, but the super absorbent polymer of the present invention has a moisture absorption capacity several times higher than that of these inorganic substances in high humidity F.
Under dry conditions, it also has the ability to release trapped moisture, and by repeating moisture absorption and moisture release, it can create appropriate humidity conditions.

Of course, the polymer can absorb dew condensation water that is generated under humid conditions due to the properties of the polymer. Among them, special public service in 1972
The self-crosslinking polyacrylate obtained by the reverse-phase suspension polymerization method disclosed in Publication No. 30710 has excellent water absorption and moisture absorption ability, and is suitable for the purpose. The shape of the superabsorbent polymer includes fine powder, powder, granules, granules, sheet, and the like.

Examples of the bag base material for the fruit bag according to the present invention include paper, synthetic resins such as perforated plastic films, fibers, nonwoven fabrics, etc., but any water-insoluble base material may be used. Since the use of paper is advantageous from the viewpoint of economy, biodegradability after use, and bag-making processability, we will provide an example using paper as a base material and add an explanation. It is possible to achieve the object of the present invention in the same way, and the present invention is not limited to the above examples. (i) ψ′p bag base paper θ) Any paper quality and color tone can be selected. No.

Insecticides and fungicides may be added to these base papers to prevent insects and fungi. Furthermore, in order to improve rain resistance,
Fruit mounting paper can also be made by applying a water repellent such as paraffin wax, turpentine oil, or drying oil.

The fruit bag according to the present invention is characterized by using a water-insoluble super absorbent polymer, but the use of the polymer may be achieved by treating the base paper used for the fruit bag with the polymer, or by treating the base paper used for the fruit bag with the polymer. Alternatively, the powder or molded product of the polymer may be placed in a fruit bag made of fruit packaging paper that has not been treated with the polymer.

The base paper for fruit mounts treated with the super absorbent polymer according to the present invention can be produced by various methods. Examples include a method of adhering and fixing a superabsorbent polymer, or a method of attaching a superabsorbent polymer between base papers, but any method may be used as long as it does not interfere with the water absorption and moisture absorption ability of the superabsorbent polymer. , but not limited to.

The structure of the fruit bag according to the present invention is not particularly limited, and may be a -type bag structure or a double bag structure. or,
The size of the fruit bag is determined as appropriate depending on the type of fruit, the size of the fruit, and the degree of maturity of the fruit, and any size can be selected.

Fruit bags using the superabsorbent polymer of the present invention can be manufactured by various methods, but for example, when constructed as a double bag,
The fruit bag of the present invention can be produced by making the inner bag out of Hatron paper containing a super absorbent polymer, and the outer bag out of thin imitation paper coated with insecticide, fungicide, and paraffin wax.

As a method of using the fruit bag of the present invention, for example, in the case of 20th century pear, the young fruit is covered with the fruit bag of the present invention about 50 days after flowering and mating to prevent rainwater, night dew, etc. from entering. One method is to seal a fruit bag at the base of the fruit stem and allow the fruit to grow within the bag until the day of harvest. Of course, the period of bagging is arbitrary depending on the type and variety of fruit.

When marsupial fruit cultivation is carried out using the fruit bag of the present invention, in addition to the protection effect from pests and diseases, which is the original purpose of the fruit bag, excess water inside the fruit body is absorbed by the super absorbent polymer, and the bag Creates a moderately dry condition inside. As a result, the following remarkable effects not seen in conventional fruit bags were produced.

(1) Effect of improving sugar content: In conventional fruit bags, the humidity inside the bag is always kept higher than outside the fruit bag, so the sugar content is lower than that of fruit without bags. In the fruit bag of the present invention, since the humidity condition inside the bag is improved, steaming from the fruit surface becomes active, the cell fluid of the fruit is concentrated, and the sugar content increases.

(2) Appearance improvement effect 2 If the humid condition inside the bag continues for a long time, for example, in the case of green pears, dew condensation will adhere to the protective tissue (cuticle layer) on the fruit surface, causing the stomata to become Cleavage occurs, causing cracks in the cuticle layer. A cork layer develops to heal this injury, but this causes the fruit skin to become rough and stain. In addition, the high temperature and humidity conditions inside the fruit pod promote the proliferation of primary parasitic bacteria, leading to the collapse of the cuticle layer.

This causes red bruises, black spots on the buttocks, etc. Use of the fruit bag of the present invention avoids injury and disease caused by high temperatures and promotes normal development of the cuticle layer, making it possible to produce fruit with an extremely beautiful appearance.

Next, examples will be shown.

(Example) Using a mature 20th century pear tree, the effect of fruit bags was observed.

As the fruit bag tested, a fruit bag (,A
)ゞ(Improved combination bag, [Toriki J#55), fruit bag (B
)ゞ(Striped/Tron combination bag, [Toriki 1 #65), Fruit bag (C) (Unstriped Nortron combination bag, [Toriki J#75
), fruit bag (D) (yellow improved combination bag, "Toririki" yellow 55
) was used. The super absorbent polymer-containing unmounted (E) of the present invention
) is a powder of 0.259-self-crosslinked polyacrylate (100-300μ) on the base paper of the inner bag of the fruit bag (A).
This bag is made of paper that has been evenly dispersed and adhered with Hatron paper. 300 fruits per June lO for each fruit bag
The fruit was hung in a bag on a daily basis, and the fruit was grown inside the bag and harvested on September 12th.

The results are shown in Table 1. In addition, in the process from bagging to harvesting, including the fruit bag i) of the present invention, (A), (B), (C
) and (D) were not detached from the fruit stalk or damaged by rain, wind, etc.

Claims (1)

[Claims] 1. A fruit bag characterized by using a water-insoluble super absorbent polymer. 2. The fruit bag according to claim 1, wherein the water-insoluble super absorbent polymer is used to form the fruit bag as a part of the fruit packaging substrate. 3. The fruit bag according to claim 1, wherein the water-insoluble superabsorbent polymer is attached to the unpacked internal surface. 4. The fruit bag according to claim 1, wherein the water-insoluble superabsorbent polymer is inserted into an unpacked interior.