JPH11240563A - Manufacture of fruit packaging intermediate laying material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a fruit packaging interlayer provided with the strength and breathability to a certain degree and to be recycled easily SOLUTION: An interlayer 1 is used for a bottom laying material, an intelayer or an upper face protective cover at the time of positioning and packaging fruits such as pears, apples, peaches and the like, and a foamed plastic cylindrical net material extruded from a plurality of extrusion channels formed on respective slide faces of an outer die and an inner die rotated slidingly in the direction opposite each other is crushed flat to both upper and lower nets 3 and 4 bonded together by heat fusion bonding or a bonding agent and form a double net structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insole for packing fruits and used for packing fruits such as pears, apples and peaches in boxes, and particularly to an insole suitable for recycling. It relates to a material and its manufacturing method.

[0002]

2. Description of the Related Art A conventional insole used for stacking fruits such as apples, peaches and the like in a cardboard box or the like is a net material formed of foamed plastic on one side of a cardboard paper. When the fruits are laminated in two stages, a plastic tray is laid on the bottom of the cardboard as a sole, the fruits are stored in the storage recess of the tray, and the fruits are stored on the tray. The insole was laid, and a plastic tray was placed and stored thereon.

[0003] As other laying materials, a plate-like coarse net may be used as an overlay or a bottom lay. However, it may be used as an insole because of the possibility of damaging the fruit and its low strength. What is not done is a thing in which the above-mentioned corrugated paper and a foamed plastic net are bonded together as an insole.

As shown in FIG. 3, basically, a plurality of extruded plastic mesh webs are formed on a sliding surface 13 of an outer die 11 and an inner die 12 slidably rotating in opposite directions. The groove 14 is dug in a circumferential direction, and the foamed plastic material is extruded from the extruded groove, thereby being thermally fused at the intersection of the foamed filaments to obtain a tubular net material.

[0005]

The insole in which the corrugated cardboard and the foamed plastic net are bonded as described above has the advantage of being strong as an insole material and minimizing damage to fruits. However, since cardboard paper and foamed plastic nets are bonded together, the presence of corrugated paper reduces air permeability to fruits, and when recycled, the cardboard paper and foamed plastic nets must be separated. However, it takes a lot of trouble, and there is a problem in recyclability which is increasingly required in the future, and improvement thereof is desired.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks of the conventional insole for packing fruits, to secure a certain strength as the insole, and to damage the fruits. An object of the present invention is to provide an insole material for fruit packaging, which is sufficiently durable, can sufficiently secure air permeability, and is particularly recyclable, and a method for producing the same. Still another object of the present invention is to obtain a versatile insole which can be used as an underlay for protecting the bottom and top surfaces.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies on the insole material for packing fruit having the above-mentioned problems, and as a result, have found that a simple process can be performed when extruding a tubular net made of foamed plastic. By adding, has breathability,
It has been found that an insole material for packing fruits that is highly recyclable can be obtained. The present invention has been completed based on such findings.

The insole for packing fruits according to the present invention is an insole used for packing fruits in a box, and is dug into respective sliding surfaces of an outer die and an inner die, which slide and rotate in opposite directions. A tubular net material made of foamed plastic extruded from a plurality of extrusion grooves provided is flattened and heat-fused to form a double net structure. Further, a double net structure can be formed by bonding with an adhesive instead of heat fusion. Further, it is also possible to use both heat fusion and adhesive bonding.

[0009] Thus, since the foamed plastic net is doubled and fused or adhered, it is possible to obtain a certain strength as an insole material, and basically, the whole is insulated. Since it is a net material, sufficient air permeability can be ensured.

The method for producing an insole for packing fruits according to the present invention is a method for producing an insole used for packing fruits in a box, wherein the outer die and the inner die slide and rotate in opposite directions to each other. A tubular net made of foamed plastic extruded from a plurality of extrusion grooves dug in each sliding surface is crushed into a flat shape, heat-fused, cut to a predetermined size, and double-cut. This is a method of obtaining an insole material with a net structure. Here, instead of heat fusion, a method of applying an adhesive to the inside of the tubular net material to adhere the same may be adopted. Further, prior to the adhesive bonding, a method of cutting the cylindrical net material to a predetermined size can be performed. Also,
The above tubular net material is cut into a predetermined size, cut open to form a flat net material having a predetermined size, and then an adhesive is applied to one surface of the flat net material to form two flat net materials. Can be obtained to obtain an insole material having a double net structure.

In the case of heat fusion, for example, the tubular net material made of foamed plastic extruded from the extrusion grooves of the inner and outer dies is heated while the wires constituting the net have residual heat capable of being fused. By crushing into a flat shape with a roller or the like and performing heat fusion, an insole material having a double net structure can be easily obtained.

Further, by appropriately setting the diameter and number of extrusion grooves provided in the inner and outer dies, the material of the foamed plastic material, the selection of additives, the extrusion speed, and the like, the strength and air permeability of the insole material can be arbitrarily set. Can be set to

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fruit packing insole and a method for producing the same according to the present invention will be described with reference to FIGS. The fruit packing insole and the method for producing the same according to the present invention are basically formed by the extrusion molding means described with reference to FIG. A plurality of extruded grooves 14 are formed in the respective sliding surfaces 13 of the outer die 11 and the inner die 12 slidably rotating, and a foamed plastic material is extruded from the extruded grooves, thereby forming each foamed wire. A tubular net material heat-fused at the intersection of the strips was obtained, and the tubular net material was crushed into a flat state by a roller or the like while having sufficient residual heat to be fused when crushed flat. Then, the insole material 1 having a double net structure is obtained by cutting to a predetermined size.

As the foamed plastic material, various materials can be used, and preferably, a mixture of foamed polystyrene and foamed polyethylene resin is used. Here, examples of the polyethylene resin include an ethylene homopolymer, an ethylene-propylene copolymer, and an ethylene-vinyl acetate copolymer. The mixing ratio between polystyrene and polyethylene resin may be appropriately determined, but generally, polystyrene: polyethylene resin = 40: 60 to 20: 8.
A ratio of 0 (weight ratio) is preferable, and the mixture in this ratio is melted, and a suitable foaming agent is further added thereto to foam. Here, the expansion ratio is not particularly limited, but is usually 30.
The expansion is preferably about 50-fold, and the foam is preferably closed. In addition, a nucleating agent such as talc and clay or an organic foaming agent is added to this foamed plastic material in an appropriate amount (for example,
4% by weight), the bubbles become finer, and the strength of the obtained insole material is improved.

The number of strands (the number of extrusion grooves 14) of the tubular net material is preferably 140 or more and 300 or less, and the cross-sectional diameter of the strand is preferably about 3 to 6 mm.

The insole material 1 manufactured as described above is
A large number of strands 2 are formed in a rhombic shape, and upper and lower nets 3 and 4 that are thermally fused at the intersections of the strands 2 are thermally fused. A certain degree of strength is obtained as a piece of net material. Therefore, the insole 1 can be used alone when packing the fruits in a box. In this case, the fruits are stored in a foamed plastic tubular cap and stacked, or stored in a plastic tray and stacked, as in the conventional case.

In order to form a double net structure, it is desirable to crush the tubular net material into a flat shape and heat-seal it as described above. You may. In addition, usually, the tubular net material is cut to a predetermined size after heat-sealing or bonding with an adhesive, but the tubular net material is cut to a predetermined size prior to the adhesive bonding. Can also. Alternatively, after the cylindrical net material is cut into a predetermined size, the cut cylindrical net material is cut open to form a flat net material having a predetermined size, and an adhesive is applied to one surface of the flat net material. And 2
The insole material having a double net structure can be obtained by laminating a plurality of the flat net materials.

[0018]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Low-density polyethylene and polystyrene were mixed at a ratio of 70:30 (weight ratio), and a nucleating agent composed of talc was added thereto at 2% by weight, and the obtained mixture was melted. The melting point of this molten mixture is about 1
It was about 08 ° C. A liquid foaming agent (pentane, acetone, etc.) was injected into the extruder, the generated gas and the molten mixture were kneaded, and extruded by cooling and pressing. The expansion ratio at this time was 40 times. The obtained foamed material is set to a die diameter of 1
60mm, number of extrusion grooves 110, diameter of extrusion grooves 0.5mm
The cylindrical net material was pressed by a take-off roll immediately, that is, at a stage where the residual heat was 90 ° C., and then cut into a predetermined size. Thereby, the insole material of the double net structure in which the upper and lower nets 3 and 4 are fused (the number of wires is 220, the cross-sectional diameter of the wires is 4 m)
m) was obtained.

As described above, the cylindrical net material extruded from the mold is immediately pressure-bonded because, after the extrusion, when a surplus time elapses and the residual heat is 80 ° C. or less, the upper and lower nets 3 and 4 are heat-sealed. It is not done.

[0020]

According to the insole for packing fruits of the present invention, the foam plastic net is doubled and the upper and lower nets are fused or adhered to each other. It is possible to obtain sufficient strength, and it is not necessary to bond it to corrugated cardboard or the like as in the conventional case. Moreover, since the whole is basically a net material, sufficient air permeability can be ensured. At the same time, recycling is easy. Further, according to the method for producing an insole for packing fruit of the present invention, the tubular net made of foamed plastic extruded from the extrusion grooves of the inner and outer dies is subjected to a residual heat capable of fusing the wires constituting the net. During the holding, for example, by crushing flat by a roller or the like, heat-sealing, and then cutting to a predetermined size, an insole material having a double net structure can be easily obtained. Furthermore, it is also possible to perform bonding using an adhesive instead of heat fusion. In addition, by appropriately setting the diameter and number of extrusion grooves provided in the inner and outer dies, the material of the foamed plastic material, the selection of additives, the extrusion speed, and the like, the strength and air permeability of the insole material are arbitrarily set. It is possible.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an insole material of the present invention.

FIG. 2 is a sectional view of a main part showing an insole material of the present invention.

FIG. 3 is a schematic sectional view of a die for extruding a tubular net made of foamed plastic.

[Explanation of symbols]

 1: insole material 2: wire 3: upper net 4: lower net 11: outer die 12: inner die 13: sliding surface 14: extrusion groove

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI B29K 105: 04

Claims (8)

[Claims] 1. An insole material used for packing fruit in a box, wherein a plurality of extrusion grooves formed on respective sliding surfaces of an outer die and an inner die which slide and rotate in opposite directions to each other. An insole material for fruit packing, characterized in that a foamed plastic tubular net material is flattened and heat-fused to form a double net structure. 2. An insole material used for packing fruit in a box, comprising a plurality of extrusion grooves dug in respective sliding surfaces of an outer die and an inner die which slide and rotate in opposite directions to each other. An insole for fruit packing, characterized in that a foamed plastic tubular net material is crushed flat and adhered with an adhesive to form a double net structure. 3. The insole material for fruit packing according to claim 1, wherein the insole material has 140 to 300 wires constituting the net. 4. The insole material according to claim 1, wherein the wire constituting the net has a cross-sectional diameter of 3 to 6 mm.
4. The insole for packing fruits according to any one of to 3 above. 5. A method for manufacturing an insole material used for packing fruit in a box, wherein a plurality of extrusions excavated on respective sliding surfaces of an outer die and an inner die which slide and rotate in opposite directions to each other. Fruit which is obtained by crushing a tubular net material made of foamed plastic extruded from a groove into a flat shape, heat-sealing, and then cutting it to a predetermined size to obtain an insole material having a double net structure. Manufacturing method of packing insole material. 6. A method for manufacturing an insole material used for packing fruit in a box, wherein a plurality of extrusions dug on respective sliding surfaces of an outer die and an inner die which slide and rotate in opposite directions to each other. After applying an adhesive to the inside of the tubular net material made of foamed plastic extruded from the groove, after crushing the tubular net material into a flat shape and bonding it,
A method for producing an insole for packing fruit, characterized by obtaining an insole having a double net structure by cutting to a predetermined size. 7. A method for manufacturing an insole material used for packing fruit in a box, wherein a plurality of extrusions dug on respective sliding surfaces of an outer die and an inner die which slide and rotate in opposite directions to each other. After cutting the tubular net material made of foamed plastic extruded from the groove into predetermined dimensions, apply an adhesive to the inside of the cut tubular net material,
A method for producing an insole for packing fruit, characterized in that the tubular net is crushed flat and adhered to obtain an insole having a double net structure. 8. A method for manufacturing an insole material used for packing fruit in a box, wherein a plurality of extrusions dug on respective sliding surfaces of an outer die and an inner die which slide and rotate in opposite directions to each other. The tubular net material made of foamed plastic extruded from the groove is cut into a predetermined size, cut and cut into a flat net material having a predetermined size, and an adhesive is applied to one surface of the flat net material. A method for producing an insole for packing fruit, characterized in that an insole having a double net structure is obtained by laminating the flat net material.