JP2002001697A - Boring method for fruit tray, punching blade die, and fruit tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a through-hole for passing a stem of a fruit without causing any wrinkle or crack on a housing recess part or a side wall in a fruit tray constructed of a rigid foamed sheet. SOLUTION: The fruit tray 1 molded of the rigid foamed sheet is provided with the desired housing recess part 2. When the through-hole 5 allowing passage of the fruit stem is formed in the side wall 3 in the housing recess part 2, a punching blade die 10, in which a through-hole punching blade 12 with a tip shape having a single/plurality of triangular blade part/parts is arranged inside an outer circumference cutting punching blade 11 in accordance with the through-hole forming position, is used, and a part of the tilting side wall 3 in the housing recess part 2 is punched out upward vertically to a tray upper face 1a for forming the through-hole 5 through the same process as the tray outer circumference cutting process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for punching a fruit tray made of a synthetic resin foam sheet having an appropriate rigidity, a punching die, and a fruit tray.

[0002]

2. Description of the Related Art Conventionally, molded articles made of a thermoplastic resin sheet such as a polystyrene resin or a polyolefin resin have been often used for fruit trays such as peaches, pears, and pears. However, some fruits such as pears are stored in trays with their fruit axes attached. In this case, there was a problem that the fruit axes hit adjacent fruits and were damaged.

[0003] Therefore, as proposed in Japanese Utility Model Laid-Open No. 7-40567 and Japanese Patent Laid-Open Publication No. 8-258871, a through-hole that can pass through a shaft of a fruit, that is, a protrusion such as a branch or a cap of the fruit, is provided. Proposed fruit packs (trays) have been proposed.

In Japanese Patent Application Laid-Open No. Hei 8-258871, a through hole is formed by melting a part using a hot plate to form a through hole. And the number of steps increases, leaving molten residue.
In addition, there is a problem that a hole may be opened in other parts due to the influence.

In Japanese Utility Model Laid-Open Publication No. 7-40567,
Near the opening edge of the fitting recess of the pack body made of an arbitrary material such as foamed polyethylene or other synthetic resin or paperboard having many rows of fitting recesses into which fruits are fitted, the flower stem of the fruit placed in the fitting recess Although there is shown a fruit transport pack having an insertion portion (through hole) through which a protrusion such as a tree or a branch is inserted, a method of forming the insertion portion is not specified.

Conventionally, in a fruit tray (1) made of a synthetic resin foam sheet of this kind, means for forming a through hole (5) in a side wall (3) of a storage recess (2) is shown in FIG.
As shown in FIG. 12, a through-hole punching blade (22) is provided upright in a predetermined arrangement inside the outer circumference cutting punching blade (21) for cutting and trimming the outer circumference of the tray (1). A tray (1) formed on the punching die (20) is placed on the punching die (20), and the contact plate (25) disposed above is lowered or the punching is performed. With the rise of the blade mold (20), the outer peripheral portion (1b) of the tray (1) is sandwiched between the punching blade (21) and the backing plate (25), so that the outer peripheral portion (1b) is cut and the storage recess is held at the same time. Through hole (5) in side wall (3) of (2)
Are known.

However, according to this method, a punching blade for a through hole having a cutting edge shape having the same linearly continuous cutting edge as the normal peripheral cutting blade (21) and having the same height as the punching blade (21). According to (22), the side wall (3) of the storage recess (2) is cut by pressing against the backing plate (25).
It is to make a hole.

At this time, since the blade-shaped through hole punching blade (22) does not easily penetrate the inclined side wall (3) of the storage recess (2), the side wall (3) portion is attached to the backing plate (22). Crush to 25) to form a through hole (5). Therefore, the side wall (3) is greatly buckled and deformed by the crushing, and wrinkles or cracks are caused by the buckling, which may cause serious damage in appearance.

For this reason, in the case of a relatively soft material such as a foamed polyethylene resin, wrinkles may be formed, but it is not preferable, but the wrinkles are not so conspicuous. In the case of a rigid material such as a base resin, not only wrinkles are generated on the side wall portions of the storage recesses, but also buckling cracks occur. Had to be done in a complicated way.

[0010] In the case of fruit trays made of a soft material such as an olefin resin, the rigidity of the whole trays is weak, and the trays may be biased due to vibration or shaking during transportation, possibly damaging the fruits.

Therefore, in a fruit tray made of a material such as a polystyrene-based resin foam sheet having a moderate rigidity which does not cause deviation due to vibration or shaking during transportation, a hole in which a through hole can be formed without causing the above problem. There is a demand for an opening method.

The present invention has been made in view of the above, and in a fruit tray made of a rigid foamed sheet such as a polystyrene resin foamed sheet, a through hole for passing a fruit shaft is formed with wrinkles or cracks. The present invention provides a punching method for a fruit tray which can be formed without generating pits, and a punching die used in the method. An object of the present invention is to provide a fruit tray characterized by a hole shape.

[0013]

A first aspect of the present invention is a method for perforating a fruit tray, which solves the above-mentioned problems.
When forming through holes through which the axis of the fruit to be stored can pass through on the side wall of the storage recess of the fruit tray having one or more storage recesses formed from a rigid synthetic resin foam sheet, one or more A through hole is formed by punching out a side wall portion of the storage recess using a blade-shaped through hole punching blade having a triangular blade portion.

The through-hole punching blade has one or a plurality of triangular blades at its cutting edge, and is made of a rigid foamed sheet and has a moderately stiff side wall. Easy and reliable piercing even when inclined. Therefore, when forming a through hole in the side wall of the storage recess of the fruit tray, the side wall portion can be easily cut out and pierced without being crushed, so that the tray made of a rigid synthetic resin foam sheet can be used. Even if there is, a through hole can be formed without generating wrinkles or cracks.

In the above-described method for punching holes in a fruit tray, a punching blade for cutting the outer periphery of the fruit tray and a through-hole having the shape of a cutting edge arranged inside thereof in accordance with a position where the through-hole is formed in the tray. In the same step as the cutting of the outer periphery of the tray, a through hole is formed by vertically punching out the inclined side wall portion of the storage recess in the direction perpendicular to the upper surface of the tray in the same step as the cutting of the outer periphery of the tray. Is preferred. Thereby, the cutting of the outer peripheral portion of the fruit tray and the formation of the through-hole in the side wall of the storage recess can be efficiently performed in one step, and the inclined side wall portion in the storage recess is cut in the direction perpendicular to the upper surface of the tray. The through holes can be reliably formed.

A second aspect of the present invention is a punching blade type used in the above-mentioned manufacturing method. The punching blade is provided for cutting the outer periphery of a fruit tray having one or a plurality of storage recesses, and the tray is provided inside the cutting blade. It is arranged according to the through hole formation position of
Further, it is characterized in that it is integrally combined with a cutting edge for a through hole having a cutting edge shape having one or a plurality of triangular blade portions. By using this punching die, it is possible to perform the cutting of the outer peripheral portion and the formation of the through hole in the side wall portion of the storage recess in one step as described above.

Further, the fruit tray of the present invention is a fruit tray having one or a plurality of storage recesses formed from a rigid synthetic resin foam sheet, wherein: A through-hole through which the axis of the fruit to be stored can pass is formed by cutting in a direction substantially perpendicular to the upper surface of the tray so as to leave a piece partially connected to the side wall portion.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a schematic plan view of an example of a fruit tray manufactured by the manufacturing method of the present invention, FIG. 2 is an enlarged sectional view of a part of the tray, FIG. 3 is an enlarged view of the same, and FIG. It is sectional drawing of the state which stored the fruit in the storage recessed part, and passed the shaft through the through-hole.

The fruit tray (1) is formed from a foamed sheet of thermoplastic synthetic resin having an appropriate rigidity by means such as press molding or vacuum molding, and has a storage recess for storing a plurality of fruits. (2), and the portion of the inclined side wall (3) near the opening of each storage recess (2) has:
A through hole (5) through which a shaft (4a) of the fruit (4) to be stored can pass is formed.

That is, as shown in FIG.
a) Put the fruit (4) with the side down on the storage recess (2)
The through-hole (5) is formed so that the shaft (4a) can be inserted and held when it is stored in the housing. Thereby, the fruit (4) can be stored so that the shaft (4a) does not hit the fruit in the adjacent storage recess.

The through-hole (5) in the embodiment shown in FIGS. 1 to 4 is formed by a notch (5c) such as an inverted V-shape, and a section (5a) corresponding to the through-hole (5) is provided below. It remains in a state of being connected to the side wall (3) at the edge.

In particular, the through-hole (5) is provided in the tray (1).
Is formed by a cut (5c) in a direction substantially perpendicular to the upper surface (1a), and is a cut surface oblique to the thickness direction of the inclined side wall (3). That is, when the through-hole (5) is formed by an inverted V-shaped cut (5c), as shown in an enlarged view in FIG. 3, a side wall is formed at the upper end of the section (5a) connected to the side wall (3) at the lower edge. The cut surface has an overlap inside (3). Therefore, when inserting the shaft (4a) of the fruit (4) as shown in FIG. 4, the section (5a) is pushed outward to open the shaft (4a) against the elasticity of the overlapping portion, so that the shaft (4a) is inserted. Therefore, the inserted shaft (4a) can be firmly held.

As shown in FIG. 5, when the through-hole (5) is formed by a V-shaped cut or the like and the section (5a) is connected to the side wall (3) at the upper edge, the section (5a) is formed. ) At the lower end, it is an oblique cut surface that overlaps the outside of the side wall (3), so that when inserting the shaft (4a) of the fruit (4), the section (5) is easily pushed outward to open. And it becomes easy to insert the shaft (4a).

Next, in the fruit tray (1), the side wall (3) of the storage recess (2) has the through hole (5).
A method for forming the will be described. Normally, a punching process is performed in the same step as the cutting process of the outer periphery of the tray by a punching blade device having a punching blade die shown in FIGS. 6 to 8.

6 to 8, reference numeral (10) denotes a punching blade type used in the method of the present invention, which has a substantially square frame-like outer periphery for cutting and trimming the outer periphery of the fruit tray (1). It consists of a cutting blade (11) for cutting and a punching blade (12) for a through-hole which is provided upright in the inner part thereof at a position corresponding to the position where the through-hole is formed in the side wall (3) of each storage recess (2). . The outer peripheral cutting blade (11) and the through hole punching blade (12) are both provided on one support base plate (13).
a) It is erected substantially vertically with (12a) facing upward, and is integrally combined as a punching die (10). The perforated cutting blade (11) is shown in an enlarged manner in FIG.
The blade edge (11a) at the upper end has a normal blade edge that is linearly continuous as in the conventional case.

The punching blade (12) for through-hole is shown in FIG.
As shown in an enlarged view, a shape having an edge (12a) at the upper end thereof having one or a plurality (in the case of the figure, plural) of triangular cutting edges (12b), for example, a triangular waveform as shown in the figure Has made. The angle of the apex angle of the triangular blade portion (12b) is preferably an acute angle from the viewpoint of the effect of piercing the foam material of the tray material, but may be a right angle or a slightly obtuse angle. In any case, the cutting edge (12a) of the punching blade (12) is
It is preferable to increase the hardness by quenching.

The through-hole cutting blade (12) has no cross-sectional shape corresponding to the cut shape of the through-hole (5), for example, an inverted V-shaped or V-shaped cut (5c) of the embodiment shown in FIGS. , A V-shaped cross section as shown in the figure (1
2), and is erected at a predetermined position in a direction corresponding to the form of the through hole (5).

(14) in the figure is the cutting blade (11) for cutting the outer periphery.
At least the upper part (the whole figure in the figure) is made of an elastic body such as rubber which can be appropriately compressed and deformed, and the upper surface of the receiving member (14) made of this elastic body is It is higher than the double cutting blades (11) and (12), and is provided so that the fruit tray (1) before processing can be received and positioned without contacting the double cutting blades (11) and (12). .
The through hole punching blade (12) is arranged in accordance with the through hole forming position of the tray (1) positioned as described above. In addition, the receiving member made of the elastic body may be provided along the inside of the outer cutting blade (11).

(15) is a backing plate disposed above the punching blade die (10), which is made of a plate material such as synthetic resin, foam, or wooden board, into which the punching blade (11) can be inserted slightly, and which is a pressing device. When cutting the plate (15) by lowering the corresponding plate (15) or raising the punching blade die (10) by a not shown (not shown), the outer periphery of the tray (1) is compressed while deforming the elastic body of the receiving member (14). Part (1b) is sandwiched between the punching blade (11) and the backing plate (15), and the tray outer peripheral portion (1
It is provided to assist the cutting action of b). In addition, it also has a function of separating the cut waste from the cut outer peripheral portion (1b).

The punching blade (12) for the through hole can be at the same height as the punching blade (11).
As shown in the figure, it is one step lower than the punching blade (11) because the blade edge (12a) does not come into contact with the backing plate (15) during drilling, and the triangular blade ( This is preferable because damage to 12b) can be prevented.

Then, with the above-configured punching blade device,
Punching of the fruit tray (1) is performed as follows.

First, a fruit tray (1) after molding and before trimming is set on a punching blade die (10). At this time, the tray (1) is positioned and placed on the receiving member (14) as shown in FIG. In this state, lower the backing plate (15) with a pressing device, or use a punching die (10).
As shown in FIG. 8, the outer periphery of the tray (1) is pressed against the backing plate (15) by the punching blade (11) while compressing and deforming the elastic body of the receiving member (14). Cutting is performed so as to be sandwiched between both the punching blade (11) and the backing plate (15).

Simultaneously with the cutting operation of the outer peripheral portion, a predetermined portion of the inclined side wall (3) of the storage recess (2) of the tray (1) is punched out by the inner through-hole punching blade (12).
In particular, since the cutting edge (12a) of the cutting blade (12) has a shape having one or a plurality of triangular cutting edges (12b) as shown in FIG. Even if the cutting edge (11a) is not perpendicular to the surface of the side wall (3) where the through hole is formed, and the punching blade (12) does not contact the backing plate (15), The triangular blade (12b) serves as a cutting edge to ensure that the side wall (3) is stabbed without being crushed because the formed side wall (3) is rigid and has moderate waist. It is possible to easily and securely pierce the tray upper surface (1a) in the vertical direction.

Therefore, buckling wrinkles or cracks due to crushing do not occur on the inclined side wall (3) of the storage recess (2) of the tray (1) made of a rigid foam sheet without causing buckling and cracking. The through-hole (5) shown in an enlarged view in FIG. 5, that is, the cut-out (5c) in the direction perpendicular to the tray upper surface (1a), leaving the section (5a).
Can be formed.

After the perforation, the backing plate (15) and the punching die (10) are separated, and the perforated tray (1) is separated.
Take out. At this time, since the punching blade (12) pierces the side wall (3) of the storage recess (2), it may not be easy to remove the punching blade (12). (Not shown) and place the tray (1)
It is desirable to be able to easily pull out and remove from the extraction blade (12).

According to the perforated fruit tray (1), the fruit (4) stored in the storage recess (2).
The shaft (4a) is inserted into the through hole (5) of the side wall (3) so that the section (5a) is pushed out and opened, thereby preventing the shaft from jumping out and preventing the fruit stored in the adjacent storage recess. Damage can be prevented. Also, since the fruit tray (1) is made of a rigid polystyrene-based resin foam sheet, it is possible to secure a stable storage state in which no deviation occurs during transportation.

In the above-described embodiment, the cut-out shape of the through-hole (5) is shown as an inverted V-shape or a V-shape, but is not limited to this. In addition, the present invention can be implemented in various cut shapes through which a fruit shaft can be pulled out, and the direction, size, and the like can be arbitrarily set. In any case, it is desirable to leave the section of the through-hole in a state of being partially connected to the side wall by cutting in a direction perpendicular to the upper surface of the tray.

As a material of the rigid synthetic resin foam sheet used for the tray of the present invention, a polystyrene resin can be suitably used. This polystyrene resin is at least 50% by weight in addition to the styrene homopolymer.
Of styrene and other copolymerizable monomers, or a mixture of at least 50% by weight of polystyrene and another resin. The foamed sheet may be a single-layer sheet of a polystyrene-based resin foam sheet or a sheet in which a thermoplastic resin foam sheet is laminated on a polystyrene-based resin foam sheet, or a non-foamed thermoplastic resin sheet or nonwoven fabric may be used as a polystyrene-based resin foam sheet. Laminated sheets may be used. Further, a foamed sheet of another rigid synthetic resin such as polyethylene terephthalate may be used.

[Examples] Table 1 below shows the trays of Examples of the present invention (Examples 1 to 4) and the trays of Comparative Examples (Comparative Example 1).
2) to 2) are the results of a punching test for forming a through hole in the same step as the outer peripheral cutting.

Examples 1 to 3 and Comparative Examples 1 and 2 are fruit trays in each of which the foamed sheet is made of a sheet having the resin type, thickness and density shown in the table. Among them, Example 3 is a fruit tray in which two types of material resins are made of a foamed sheet according to the mixing ratio shown in the table. Examples 2 and 4
Is a fruit tray in which the laminated sheet described in the table column is formed into a laminated sheet via a hot-melt adhesive on the foam sheet described in the table column, and the laminated sheet is disposed on the inner side of the tray.

In the punching test, the punching blade dies of Examples 1 to 4 and Comparative Example 1 were formed as shown in FIGS. 6 to 8 (the punching blade for the through hole was one step lower than the punching blade for the outer peripheral cutting). Using, and about the comparative example 2, it performed on condition of the following using the punching die shown in FIGS. The cutting edge shape of each punching blade is as described in the table.

Extraction Blade Device and Extraction Conditions 1. Cutting blade device: Toko TCM550A Pressing speed: 60 mm / sec 3. Size of outer cutting blade: 480 mm × 330 mm Number of through-hole punching blades: 16 places The results of the punching test were evaluated based on the state of the through-holes and the appearance of the entire tray, and summarized as a comprehensive evaluation.

[0044]

[Table 1]

As a result of this pulling out test, no through hole could be formed in Comparative Example 1 made of a flexible polyethylene foam sheet. During the test, the through-hole punching blade contacted the side wall of the storage recess of the tray, but the entire storage recess was crushed due to the flexibility of the tray. As a result, no through hole was formed. When the drilling operation was completed, the storage recess was restored to its original state.

In the case of Comparative Example 2, cracks occurred due to the formation of through holes. In the test, when the punching blade for a through-hole came into contact with the tray, the storage recess was crushed and deformed as shown in FIG. 12, and at that time a through-hole could be formed, but a large crack was generated around it.

In Examples 1 to 4, as described in the table, both the shape of the through-hole and the appearance of the fruit tray were good.

Thus, according to the present invention, in a fruit tray made of a rigid synthetic resin foam sheet such as a polystyrene resin foam sheet, buckling wrinkles and cracks are generated on the inclined side wall of the storage recess by crushing. It has been found that a through-hole can be formed without any problem.

[0049]

As described above, according to the present invention, in a fruit tray made of a relatively rigid foam sheet such as a polystyrene resin foam sheet, a through hole for passing a fruit shaft is formed with wrinkles or cracks. Can be formed without causing the occurrence of.

In addition, it is possible to provide a fruit tray in which a through-hole formed by cutting in a direction perpendicular to the upper surface of the tray is formed on the inclined side wall of the storage recess so as to leave the section, so that the fruit shaft can be favorably formed by the through-hole. In combination with the rigid foam sheet, the fruit stored in the storage recess can be protected well.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of a fruit tray manufactured according to the present invention.

FIG. 2 is an enlarged sectional view of a part of the tray.

FIG. 3 is an enlarged view of a part of the above.

FIG. 4 is a cross-sectional view in which fruit is stored in a storage recess and a shaft is passed through a through hole.

FIG. 5 is an enlarged front view (a) and an enlarged cross-sectional view (b) showing examples of another through hole.

FIG. 6 is a schematic plan view showing a punching die used in the present invention.

FIG. 7 is a cross-sectional view before a punching process is performed by a punching blade device including the punching die of the present invention.

FIG. 8 is a cross-sectional view showing a pressed hole in the same state.

FIG. 9 is a partially enlarged perspective view showing the shape of the cutting edge of the through-hole punching blade of the present invention.

FIG. 10 is a partially enlarged perspective view showing a shape of a cutting edge of an outer peripheral cutting punching blade.

FIG. 11 is a cross-sectional view before a punching process is performed by a punching blade device including a conventional punching blade die.

FIG. 12 is a cross-sectional view of the same press-drilled state.

[Explanation of symbols]

 (1) Fruit tray (2) Storage recess (3) Side wall (4) Fruit (4a) Fruit shaft (5) Through-hole (5a) Cut-out scrap to be cut out (10) Die-blade type (11) Die for outer circumference cutting Blade (11a) Blade edge (12) Drilling blade for through hole (12a) Blade edge (12b) Triangular blade (13) Support base plate (14) Receiving member (15) Patch plate

Continued on the front page F term (reference) 3C060 AA05 BA03 BB08 BH01 3E033 AA10 BA13 CA20 FA04 GA03 3E075 BA88 CA01 DB03 DB07 DB12 DB16 GA02 3E096 AA09 BA27 BB09 CA06 CB02 CC02 DA18 DB02 DC01 EA02X EA02Y FA17 GA05

Claims (4)

[Claims] 1. A fruit tray having one or a plurality of storage recesses formed from a rigid synthetic resin foam sheet has a through-hole through which a shaft of stored fruit can pass through in a side wall of the storage recess. A punching hole for a fruit tray, wherein a through-hole is formed by piercing a side wall portion of the storage recess using a blade-shaped through hole punching blade having one or a plurality of triangular blade portions. Processing method. 2. A cutting blade for cutting the outer periphery of the fruit tray,
Using a punching blade mold having a blade-shaped through-hole punching blade arranged in accordance with the through-hole forming position of the tray inward thereof, in the same step as cutting the outer periphery of the tray,
The hole punching method for a fruit tray according to claim 1, wherein a through-hole is formed by punching a portion of the inclined side wall of the storage recess in a direction perpendicular to the upper surface of the tray. 3. A cutting blade for cutting an outer periphery of a fruit tray having one or a plurality of storage recesses, and one or a plurality of triangular blades disposed inside thereof in accordance with a position where a through hole is formed in the tray. A punching blade type, which is integrally formed with a punching blade for a through hole having a cutting edge shape having a portion. 4. A fruit tray having one or a plurality of storage recesses formed from a rigid synthetic resin foam sheet, wherein a fruit axis to be stored passes through an inclined side wall of the storage recess. A fruit tray characterized in that a through-hole formed is formed by cutting in a direction substantially perpendicular to the upper surface of the tray so as to leave a piece partially connected to the side wall portion.