JPH06205616A - Packing material for fruit - Google Patents

Abstract

PURPOSE:To obtain a packing material useful for peach, apple, etc., having excellent insecticidal and bird preventing effect, improving effect on saccharimetric degree, workability and automatical bag making stability, comprising a film prepared by laminating a porous polyolefin layer composed of a specific resin composition to a base layer. CONSTITUTION:This packing material comprises a film or sheet obtained by molding a resin composition composed of (A) 100 pts.wt. polyolefin resin having <=0.93g/cm<3> density and <=2g/10min melt index, (B) 25-400 pts.wt. filler such as calcium carbonate, (C) 1-100 pts.wt. plasticizer such as stearic acid amide having ester bond or amide bond in the molecule, having molecular weight of >=100, boiling point of >=200 deg.C at normal pressure and melting point of <=100 deg.C and (D) 0.0001-0.1 pt.wt. radical generator to give a film or a sheet, stretching the film or sheet at least in its take-up direction to give a porous polyolefin layer and laminating the porous polyolefin layer to a base layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material for wrapping fruits, which is used for insect repellent, bird repellent and sugar content enhancement in the cultivation of fruits such as peaches, apples, pears and grapes.

[0002]

2. Description of the Related Art Conventionally, paper bags have been used exclusively as fruit growing bags. However, sufficient insect and bird-proof effects have not been obtained, such as pests and birds sucking fruit juice from paper bags.

[0003]

When a bag formed of a polyolefin-based or polyester-based film or the like is used, although sufficient insect and bird protection effects can be obtained,
Due to low moisture and air permeability, there is a problem that the fruits rot or the quality deteriorates. Some of the inventors of the present invention have previously proposed a fruit packaging material using a porous film composed of a polyolefin resin, a filler and a plasticizer (Japanese Patent Laid-Open No. 3-18).
0124, JP-A-3-187323).

However, the rigidity of the porous film is low, and further improvement has been desired in terms of suitability for automatic bag making and workability of bag hanging on fruits.

[0005]

As a result of further studies to improve this point, the present inventors have found that a laminated film or sheet having a porous polyolefin layer formed from a resin composition of a specific composition provided on a substrate. By using as
The inventors have found that the above problems can be solved and have completed the present invention.

[0006] That is, the gist of the present invention is a packaging material for wrapping a fruit when cultivating the fruit, which packaging material comprises (A)
Density 0.93g / cm ³ or less, melt index 2g
/ 10 min. 100 parts by weight of the following polyolefin resin, (B) 25 to 400 parts by weight of a filler, and (C) a molecular weight of 100 having an ester bond or an amide bond in the molecule.
As described above, it is obtained by molding a resin composition consisting of 1 to 100 parts by weight of a plasticizer having a boiling point of 200 ° C. or higher at a normal pressure and a melting point of 100 ° C. or lower and 0.0001 to 0.1 parts by weight of the (D) radical generator. A fruit packaging material comprising a film or sheet obtained by laminating a porous polyolefin layer obtained by uniaxially stretching a film or sheet in at least the take-up direction and a base material layer.

The present invention will be described in more detail below. The polyolefin resin (A) is a homopolymer of ethylene or propylene or a density (ρ) composed of a copolymer of ethylene or propylene and another comonomer (a compound having at least one double bond having 4 or more carbon atoms in the molecule).
0.930 g / cm ³ or less, melt index (M
I) Polyolefin thermoplastic resin of 2 g / 10 minutes or less, for example, low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, density 0.910
Any of the following ultra-low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-methacrylic acid ester or a mixture thereof may be used, but the density is preferably 0.91-0. Density of 0.930 g / cm ^{3 or} less consisting of 50-100 parts by weight of linear low density polyethylene of 95 g / cm ³ and 50-0 parts by weight of ethylene-α-olefin copolymer having a density of less than 0.91 g / cm ³ . Especially 0.90
0 to 0.925 g / cm ³ , MI 2 or less, especially 0.1
It is a polyolefin type thermoplastic resin of up to 1.5.

The linear low-density polyethylene is a copolymer of ethylene and another α-olefin, for example, ethylene and its 1-butene of about 4 to 17% by weight, preferably about 5 to 15% by weight, 1-hexene, 1-octene, 1
It is produced by copolymerizing with other α-olefins such as decene and 4-methyl-1-pentene by using the Ziegler type catalyst or Phillips type catalyst used in the high-pressure polyethylene production in the medium and low pressure method.

The above ethylene-α-olefin copolymer is usually a copolymer of ethylene and an α-olefin having 3 or more carbon atoms and has a density of 0.91 g / cm 3.
It is preferably less than ³ , more preferably 0.85
It is 0.90 g / cm ³ . Examples of the α-olefin having 3 or more carbon atoms to be copolymerized with ethylene include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, and the like.
It is also possible to use non-conjugated dienes such as hexadiene, dicyclopentadiene, ethylidene norbornene.

The above-mentioned ethylene-α-olefin copolymer is produced by using a Ziegler-type catalyst, especially a catalyst composed of a vanadium compound such as vanadium oxytrichloride and vanadium tetrachloride and an organoaluminum compound, and ethylene and α-olefin.
-It can be produced by copolymerizing with an olefin, and the ethylene content in the copolymer is in the range of 40 to 90 mol% and the content of the α-olefin is 10 to 60.
It is preferably in the range of mol%. Ethylene-α-
Examples of commercially available olefin copolymers include CdF
Chimie E. P. NORSOFLEX (FW
1600, FW1900, MW1920, SMW244
0, LW2220, LW2500, LW2550); Nippon Unicar Flex Resin (DFDA1137,
DFDA1138, DEFD1210, DEFD904
2); Tuffmer (A4085, A40 of Mitsui Petrochemical Co., Ltd.
90, P0180, P0480), J of Japan Synthetic Rubber Co., Ltd.
SR-EP (EP02P, EP07P, EP57P) etc. are mentioned.

When the density (ρ) of the polyolefin resin (A) used alone or as a mixture is larger than 0.930 g / cm ³ , the synergistic effect of the plasticizer and the radical generator is small and the tear strength cannot be improved. On the other hand, when the MI is more than 2 g / 10 minutes, the tear strength of the film is lowered and the molding stability is lowered.

In the method of the present invention, the melt index (MI) is J which is a reference standard of JIS K 6760.
It is a value measured in accordance with Condition 4 of Table 1 of IS K 7210. In addition, a heat stabilizer, an ultraviolet stabilizer, a pigment, an antistatic agent, a fluorescent agent, etc. may be added to the polyolefin resin according to a conventional method.

Next, as the filler of the component (B), inorganic and organic fillers are used. As the inorganic filler, calcium carbonate, talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, calcium oxide, magnesium oxide. , Titanium oxide, alumina, mica, asbestos powder, glass powder, shirasu balloon, zeolite, silicate clay and the like are used, and calcium carbonate, talc, clay, silica, diatomaceous earth, barium sulfate and the like are particularly preferable.

As the organic filler, cellulosic powder such as wood powder or pulp powder is used. These may be used alone or as a mixture. The average particle size of the filler is 30
It is preferably not more than μm, more preferably not more than 10 μm, most preferably 0.7 to 5 μm. If the particle size is too large, the denseness of the pores of the stretched product will be poor, and if the particle size is too small, dispersibility in the resin will be poor and moldability will be poor.

The surface treatment of the filler is preferably carried out from the viewpoint of dispersibility in the resin and further stretchability, and treatment with a fatty acid or its metal salt gives preferable results. As the plasticizer of the component (C), a molecular weight having an ester bond or an amide bond in the molecule is 100 or more, preferably 150 or more, particularly 200 to 1000, and a boiling point at atmospheric pressure of 200 ° C. or more, preferably 250. Above ℃, especially,
Compounds having a melting point of 250 to 700 ° C. and a melting point of 100 ° C. or lower, preferably 50 ° C. or lower, particularly −100 to 10 ° C.

For example, an ester of a carboxylic acid having 6 or more carbon atoms and an alcohol having 5 or more carbon atoms or an aliphatic amide having 10 to 25 carbon atoms which satisfies the above physical properties can be mentioned. Among them, an ester of an aromatic carboxylic acid and an aliphatic alcohol having 6 or more carbon atoms, preferably an ester of an aromatic dicarboxylic acid or aromatic tricarboxylic acid and an aliphatic alcohol having 6 to 18 carbon atoms, particularly an aromatic dicarboxylic acid An ester of an acid and an aliphatic alcohol having 8 to 15 carbon atoms and an ester of an aromatic tricarboxylic acid and an aliphatic alcohol having 6 to 10 carbon atoms are preferable.

Specific examples of these compounds include stearic acid amide, oleic acid amide, triisodecyl trimellitate, trioctyl trimellitate,
Diisodecyl phthalate, dioctyl phthalate, etc. are mentioned. Most preferably, trioctyl trimellitate and diisodecyl phthalate are mentioned. Melting point is 1
If it is higher than 00 ° C, the effect of improving the tear strength by modification with a radical generator is small, and if the boiling point is lower than 200 ° C,
Smoke generation and foaming during molding process lowers the moldability and stretchability. When the molecular weight is small, bleeding of the plasticizer from the film is undesirably quick.

Next, as the radical generator of the component (D) used in the present invention, the decomposition temperature at which the half-life is 1 minute is 1
The range of 30 to 300 ° C., preferably 160 to 260 ° C. is preferable, and for example, dicumyl peroxide, 2,
5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-bis (t-butylperoxy) -3-hexyne, α, α′-bis (t-butylperoxy) Examples include peroxides such as isopropyl) benzene, dibenzoyl peroxide, and di-t-butyl peroxide 2,5-dimethylhexane-2,5-dihydroperoxide. Most preferably, 2,5-dimethyl-2,5-bis (t-butylperoxy) -3-hexyne is mentioned.

In the present invention, by using the plasticizer (C) and the radical generator (D) in combination, the strength of the porous film or sheet constituting the porous polyolefin layer is good, and the strength of the porous film or sheet and that of the base material described later are improved. Prevents scratches and tears during the laminating process. In the present invention, 100 parts by weight of the polyolefin resin (A) and 100 to 4 parts by weight of the filler (B) are used.
00 parts by weight, preferably 120 to 300 parts by weight, particularly 130 to 250 parts by weight, plasticizer (C) 1 to 100 parts by weight, preferably 2 to 50 parts by weight, particularly 2 to 30 parts by weight, and Radical generator (D) 0.0001 to 0.1
Parts by weight, preferably 0.0005 to 0.07 parts by weight,
Particularly, it is used in the range of 0.005 to 0.05 parts by weight.

If the proportion of the filler (B) is less than 100 parts by weight, the stretched film will not have sufficient pores and the degree of porosity will be low. On the other hand, if the proportion of the filler exceeds 400 parts by weight, the kneadability, dispersibility, film or sheet moldability will deteriorate, and the surface strength of the stretched product will decrease. When the amount of the plasticizer (C) is less than 1 part by weight, the effect of improving the tear strength is not obtained, and when it is more than 100 parts by weight, the kneading property and the dispersibility are deteriorated and the film formability is deteriorated and the stretchability cannot be secured.

The radical generator (D) is from 0.0001 to
It is selected from the range of 0.1 parts by weight, and when it is less than this range, the tear strength cannot be improved by the synergistic effect with the plasticizer, and when it is more than this range, the melt index becomes too low, It is not preferable because film breakage is likely to occur during film formation, and roughening of the film surface occurs.

In the present invention, the polyolefin resin (A), the filler (B), the plasticizer (C), and the radical generator (D) are usually added in the above-mentioned amounts, for example, by the following method I or II. After mixing in a ratio, then kneading and pelletizing, inflation molding is performed to obtain an unstretched film. Method I: A polyolefin resin, a filler, a plasticizer, and a radical generator are mixed and kneaded using a kneader such as an extruder or a Banbury mixer, then pelletized, and inflation molding is performed using the pellets. Method II: A large amount of 0.3 to 2% (3,000 to 20,000 ppm) of a radical generator is mixed with a polyolefin resin, and melt kneading is performed at a temperature at which the radical generator hardly reacts with the polyolefin and at a temperature higher than the melting point of the polyolefin. Then, a master batch in the form of pellets is prepared in advance, and the master batch is mixed with a polyolefin resin, a filler and a plasticizer, kneaded, and then pelletized, and inflation molding is performed using the pellets.

When the polyolefin resin is kneaded with the radical generator under heating (preferably at a temperature not lower than the half-life of the radical generator is 10 minutes) according to the method shown in I or II above, the radical generator causes crosslinking. A reaction occurs, the polyolefin is intermolecularly coupled, a high molecular weight component is increased, and a modified polymer having a lowered melt index is obtained. This modified polymer is more likely to be oriented in the lateral direction during inflation molding as compared with the polymer before modification, and thus the film thus obtained has a significantly improved tensile strength and impact strength when stretched. .

To mix the polyolefin resin, the plasticizer, the radical generator and the filler, a drum, a tumbler type mixer, a ribbon blender, a Henschel mixer, a super mixer or the like is used. A mixer of the type is preferred and polyethylene is preferably supplied in the form of a powder, usually 10-150 mesh, especially 20-60 mesh. The kneading of the obtained mixture is carried out using a known kneading device such as a screw extruder, a twin screw extruder, a mixing roll, a Banbury mixer, a twin screw type kneader.

In the present invention, the thickness of the composition obtained above is usually 10 to 10 by an inflation method or a T-die method.
200μ unstretched film or thickness 200-400μ
The unstretched sheet is molded, and then this unstretched film or sheet is stretched. Inflation molding is usually carried out with a blow-up ratio (BUR) of 2-8.

Preferably, the blow-up ratio is 3 to 6, and the height of the frost line is 2 to 5 of the diameter of the annular slit of the die.
Make it 0 times. More preferably, the height of the frost line is in the range of 5 to 20 times the diameter of the annular slit of the die. If the blow-up ratio is lower than the above range, the tensile strength and impact strength of the film will be reduced, and if it is higher than the above range, the bubble molding stability will be lowered, so that the above range is preferable. Further, if the height of the frost line is lower than the above range, the tensile strength of the film is lowered, and if it is higher than the above range, the bubble molding stability is lowered, so that the above range is preferable.

The unstretched film or sheet formed by the inflation method is then uniaxially stretched in the machine direction (the film take-up direction). The roll stretching method is usually employed for the uniaxial stretching, but the uniaxial direction (the take-up direction) may be emphasized by the tubular stretching method. The stretching treatment may be performed in one stage or in multiple stages of two or more stages. A product formed by the T-die method is subjected to longitudinal uniaxial stretching or biaxial stretching.

The stretching treatment is performed at 100 ° C. from the melting point of the resin composition.
It is preferable to carry out in the range of a low temperature to a temperature 20 ° C lower than the melting point, particularly a temperature of 90 ° C lower than the melting point of the resin composition to a temperature 50 ° C lower than the melting point. Occurrence occurs, and the porosity of the film tends to decrease at a temperature higher than this range.

The draw ratio is preferably 1.2 to 8 times. If the film is heat-treated after stretching, the dimensional accuracy of the film can be stabilized, and known surface treatments such as corona treatment and flame treatment can be applied. The porous film or sheet constituting the porous polyolefin layer of the present invention thus obtained has high surface strength and tear strength,
Moreover, since there is no stretching unevenness, it can be suitably used. In particular,
In the case of a porous film having a thickness of 100 μm or less, preferably 15 to 50 μm, the bending resistance in both the longitudinal direction and the lateral direction is 5
0 mm or less, preferably 10 to 35 mm, and water vapor permeability of 1500 g / m ² · 24 hr or more, preferably 250
0-5000g / m ² · 24hr, air permeability 3000
sec / 100cc or less, preferably 2000sec /
When the surface strength is 100 cc or less, the surface strength is expressed by the following formula (1).

[0030]

[Formula 1] Surface strength [kg] ≧ 35 × Film thickness [mm] (1)

Preferably, the formula (1 '),

[0032]

[Equation 2] Surface strength [kg] ≧ 50 × film thickness [mm] ... (1 ′)

The tear strength is satisfied and the tear strength is expressed by the following formula (2).

[0034]

## EQU00003 ## Tear strength [g / sheet] ≧ 1500 × film thickness [mm] (2)

Preferably, the formula (2 ')

[0036]

Tear strength [g / sheet] ≧ 1800 × film thickness [mm] ... (2 ′)

It is preferable because a film satisfying the above conditions can be obtained. The base material for providing the above-mentioned porous polyolefin layer may be one having air permeability so as not to impair the physical properties of the porous film or sheet, and for example, a split cloth made of paper or split yarn or Nonwoven fabric or the like is used.

The porous polyolefin layer and the base material are laminated via an adhesive layer or by thermocompression bonding. Usually, the adhesive layer or the thermocompression bonding portion is provided between the porous polyolefin layer and the base material. Partially provided. Specifically, for example, there is a method in which the above-mentioned porous film or sheet and a base material such as paper or non-woven fabric are attached with a hot melt adhesive or the like.
At this time, the adhesive is partially provided, but it can be arbitrarily performed such as staggered spotting or line attachment at appropriate intervals.

Other laminating methods include a method of partially thermocompressing a porous film or sheet and a polyolefin split cloth or non-woven fabric, a method of partially laminating a porous film or sheet and a substrate with a layer of low density polyethylene or the like. A method such as extrusion laminating through the method can be used. The thus-obtained laminated film or sheet of the present invention is so-called, strong, and has very good automatic bag-making suitability for bags for fruit cultivation. It can be applied directly to an automatic bag making machine. Also, the workability of covering the fruits is greatly improved.

It is also desirable to color the bag yellow so that the insect repellent performance is improved. It is also desirable to make several drainage holes with a diameter of 1 mm or less at the bottom of the bag, because it is possible to prevent water from accumulating inside the bag along the branches. If the drainage hole is larger than this, insects will enter and the fruit will be damaged. In addition, if there is no water drainage hole, it has moisture permeability, but since there is no water permeability, water may enter along the branches, and in this case, water may accumulate in the bag and the fruit may rot.

[0041]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples as long as the gist thereof is not exceeded.

Example 1 (1) Linear low density polyethylene {melt index
(MI): 1.0 g / 10 minutes, flow ratio (10 times load MI
/ MI): 19, density (ρ): 0.921 g / cm ³,
Copolymerization component: 1-butene, copolymerization amount: 10% by weight, melt
Points: 120 ° C} was crushed into 40 mesh powder
Of 80 parts by weight of ethylene-propylene copolymer (EP
R, EP07P manufactured by Japan Synthetic Rubber Co., Ltd., MI: 0.4 g / 1
0 minutes, ρ: 0.86 g / cm³) Is also 40 mesh
20 parts by weight of crushed powder of Henschel
Stir and mix in a mixer. M of the obtained polymer composition
I is 0.8 g / 10 minutes, density is 0.909 g / cm³so
there were. Then add dioctylphthale as a plasticizer
4 parts by weight and radical generator 2,5-dimethyl-2,5
-Bis (t-butylperoxy) -3-hexyne
02 parts by weight were added and mixed with stirring.

Further, calcium carbonate (average particle size 1.2 μ
m, fatty acid treatment) was added and mixed by stirring. The mixture thus obtained was mixed with a twin-screw kneader DSM-6.
5 (Double Screw Mixer, manufactured by Japan Steel Works, Ltd.) was kneaded and granulated. 40m
Inflation molding with mφ extruder, thickness 70μ
m film. The extrusion conditions are as follows.

Cylinder temperature: 170-190-210
-230 ° C. Head, die temperature: 200 ° C. Die diameter: 100 mm Pulling speed: 8 m / min Blow-up ratio: 3 Frost line height: 700 mm Folding diameter: 471 mm The film thus obtained is slit in the pulling direction and rolled. Was uniaxially stretched by a machine.

The stretching conditions were as follows. Stretching temperature: 60 ° C. Stretching ratio: 2.0 times Speed after stretching: 11.0 m / min Film thickness after stretching: 35 μm

The physical properties of the obtained film were evaluated as follows, and the results are shown in Table 1. 1) Water vapor transmission rate: According to ASTM E26-66 (E). 2) Tear strength: According to JIS P 8116, the pulling direction of the film is measured, and the strength per sheet is determined by g. 3) Surface strength: Film sample 100 mm x 100 m
Cut into squares of m, and sandwich and fix with two donut-shaped presser rings with an inner diameter of 80 mm. With a round bar having a thickness of 20 mm at the center of the film, a hemispherical plunger with a radius of 10 mm is pushed at a speed of 500 mm / min, and the pressing distance when the film breaks is the elongation.
The strength at that time is defined as the surface strength.

4) Moldability: It was visually evaluated according to the following criteria. ⊚: Bubble stable, no die line ◯: Bubble stable, die line present Δ: Film width variation ×: Unmoldable 5) Flexibility: The touch was judged by the following criteria. ◎: Extremely soft ○: Soft △: Slightly hard ×: Hard 6) Stretchability ◎: No cutting, uniform stretching, no stretching unevenness ○: No cutting, stretching unevenness, almost none △: No cutting, stretching unevenness, slightly existence × : Large uneven cutting or stretching

Next, the moisture permeable film was laminated on a paper having a basis weight of 40 g / m ² through a hot melt resin linearly applied to obtain a composite sheet of the present invention. The composite sheet was put into an automatic bag making machine for paper bags, which has been used conventionally, to obtain bags. At this time, a bag was obtained without any problem. The obtained bag was covered on the fruit and evaluated according to the following evaluation methods. The results are shown in Table 2.

Evaluation Method 80 pieces of each film were hung on a peach bag and evaluated until the harvest. 1) The night moth damage rate was expressed by% for fruits with sucking marks on the surface of peach. 2) For the workability of bag hanging, it was examined how many bags could be put in 10 minutes. 3) Fruit sugar content was measured with a Brix sugar content meter. 4) The fruit of the rotten peach was expressed in%. (The decay includes decay due to sucking marks and decay due to water wetting)

Example 2 80 parts by weight of the linear low-density polyethylene used in Example 1,
Ethylene-butene-rubber (Mitsui Petrochemical Co., Tuffmer A4085, MI: 3.6 g / 10 minutes, ρ: 0.88
g / cm ³ ) (Toughmer is a trade name) 20 parts by weight (the density of the composition when these are mixed is 0.913 g / cm ^{3
At 3} , the MI is 1.3 g / 10 minutes. ), 6 parts by weight of trioctyl trimellitate as a plasticizer, 0.03 parts by weight of 2,5-dimethyl-2,5-bis (t-butylperoxy) -3-hexyne as a radical generator, and calcium carbonate. 200 parts by weight was used.

Of the molding conditions, the frost line height is 8
A film was obtained in the same manner as in Example 1 except that the thickness was set to 00 mm. The evaluation results are shown in Tables 1 and 2.

Example 3 80 parts by weight of the linear low-density polyethylene used in Example 1 and ultra-low-density polyethylene (CDF Chimie) were used.
E. P. Company, FW1900, MI: 1.0g / 10
Min, ρ: 0.900 g / cm ³ ) 20 parts by weight (the density of the composition when these are mixed is 0.917 g / cm ³
The MI is 1.0 g / 10 minutes. ), 3 parts by weight of diisodecyl phthalate as a plasticizer, 0.02 part by weight of the same radical generator as in Example 1, and 20 parts of calcium carbonate.
0 parts by weight was used.

Of the molding conditions, the frost line height is 1
A film was obtained in the same manner as in Example 1 except that the thickness was 000 mm, the draw ratio was 2.1, and the nonwoven fabric was used as the substrate. The evaluation results are shown in Tables 1 and 2.

Example 4 As a linear low density polyethylene (MI: 0.5 g / 10
Min, flow ratio: 20, density: 0.921 g / cm ³ , copolymerization component: 1-butene, copolymerization amount: 10% by weight, melting point: 1
80 parts by weight of 20 ° C.), 20 parts by weight of ethylene-butene-rubber used in Example 2 (when these are mixed, the composition has a density of 0.909 g / cm ³ and an MI of 0.5).
g / 10 minutes. ), 4 parts by weight of diisodecyl phthalate as a plasticizer, 0.03 part by weight of the same radical generator as in Example 1 and 200 parts by weight of calcium carbonate.

Of the molding conditions, the frost line height is set to 8
A film was obtained in the same manner as in Example 1 except that the stretching ratio was 00 mm and the stretching ratio was 2.5 times. The evaluation results are shown in Tables 1 and 2.
Shown in.

Comparative Example 1 A film was obtained in the same manner as in Example 1 except that the plasticizer was not used. The evaluation results are shown in Table 1.

Comparative Example 2 A film was obtained in the same manner as in Example 1 except that the radical generator was not used. The evaluation results are shown in Table 1.

Comparative Example 3 A film was obtained in the same manner as in Example 2 except that the plasticizer was not used. The evaluation results are shown in Table 1.

Comparative Example 4 The procedure of Example 1 was repeated except that no bag was hung. The results are shown in Table 2.

Comparative Example 5 The procedure of Example 1 was repeated except that a paraffin paper bag was hung. The results are shown in Table 2.

Comparative Example 6 The procedure of Example 1 was repeated except that the bag containing only the moisture-permeable film obtained in Example 1 was used. However, this bag was made by hand because the waist cannot be made weak with an automatic bag making machine.

[0062]

[Table 1]

[0063]

[Table 2]

[0064]

In the present invention, when the laminated film or sheet is used as a bag for fruit cultivation, excellent insect control,
Good bird proofing effect, sugar content improving effect and workability for covering the bag. Further, the suitability for automatic bag making is good, and there is an advantage that a conventional automatic bag making machine can be diverted.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B65D 85/34 G 8921-3E

Claims (1)

[Claims] 1. A packaging material for wrapping a fruit when cultivating the fruit, wherein the packaging material has a (A) density of 0.93 g / cm ^3.
Below, melt index 2 g / 10 min. 100 parts by weight of the following polyolefin resin, (B) filler 25 to 4
00 parts by weight, (C) a molecular weight of 100 or more having an ester bond or an amide bond in the molecule, and a boiling point of 200 at normal pressure.
At least a film or sheet obtained by molding a resin composition comprising 1 to 100 parts by weight of a plasticizer having a melting point of 100 ° C. or higher and 100 ° C. or lower of a melting point and 0.0001 to 0.1 parts by weight of a (D) radical generator is taken. A fruit packaging material comprising a film or sheet obtained by laminating a porous polyolefin layer obtained by uniaxially stretching in a direction and a base material layer.