JPH08282759A - Tray for packaging fruit or the like - Google Patents

Abstract

PURPOSE: To obtain a hay for packaging fruit or the like with superior cushioning properties and shape-retaining properties by a method wherein the hay is formed of a laminated sheet of a thermoplastic resin sheet and a polyurethane foam sheet with the polyurethane foam sheet disposed inside recessed parts. CONSTITUTION: In a packaging hay A, a surface of a polyurethane foam sheet 1 is melted by a flame to be integrally contact bonded to a polypropylene resin sheet 2, and recessed parts 3 are formed by vacuum forming or pressure molding the laminated composite sheet. Since the inner peripheral surface of the recessed part 3 is made of the polyurethane foam sheet 1, high cushioning properties in storage of fruit or the like and ideal air-permeability can be obtained, therefore reducing the bruise of fruit. On the other hand, since the outer periphery of the packaging tray A including the outer peripheral surfaces of the recessed parts 3 is made of the polypropylene resin sheet 2, the tray has superior shape- retaining properties as a whole and a resistance to vibration at the time of transport, thus preventing the shift of a package and the contact of fruits with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging tray for fruits and the like, and relates to a packaging tray which is excellent in breathability and cushioning property, and is excellent in storage and transportation of stored items.

[0002]

2. Description of the Related Art Conventionally, as a tray for packaging fruits and the like,
A packaging tray made of a thermoplastic resin sheet having a large number of storage recesses is used. This packaging tray can successively store fruits and the like in a large number of recesses for storage and can protect them from impacts during transportation. However, although this packaging tray is excellent in shape retention, it is inferior in water absorption and impact resistance, and improvement has been demanded.

Therefore, for example, a polyolefin resin foam sheet is used as a packaging tray having excellent cushioning property,
There is a packaging tray having a recess formed by vacuum forming or the like. Although a tray for packaging fruits and the like using this foamed sheet has excellent cushioning properties, it is not so good in terms of shape retention. -When packing and transporting in a package, the packaging tray itself may be laterally displaced, so that it is unavoidable that fruits in the upper and lower trays come into contact with each other. It had the drawback of being easily damaged.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tray for packaging fruits and the like, which has excellent cushioning properties for fruits and excellent shape retention.

[0005]

The present invention was developed in order to achieve the above-mentioned object, and is a packaging tray having a recess for storing fruits and the like, which comprises a thermoplastic resin sheet. And a polyurethane foam sheet, wherein the polyurethane foam sheet is inside the recess, and relates to a tray for packaging fruits and the like.

The recess of the packaging tray is usually formed by vacuum molding or pressure molding. Preferably, the thermoplastic resin sheet and the polyurethane foam sheet are integrally formed at the time of molding the recess. It is glued.

[0007]

The present invention is divided into a function of a tray for packaging fruits and the like, that is, a function of retaining the shape of a packaging tray and a function of a cushioning material, and each sheet is associated with a different sheet. It has achieved its purpose. That is, the shape of the packaging tray is maintained by using a thermoplastic resin sheet as an outer layer of the packaging tray. Also, the inner layer,
That is, a polyurethane foam sheet is particularly selected as the layer on the side that comes into contact with fruits and the like, whereby the inside of the recessed portion is formed to impart a cushioning property to the stored fruits.

The thermoplastic resin sheet is polyethylene,
A thermoplastic resin sheet made of polypropylene, vinyl chloride resin or the like is adopted, and the thickness of the polyurethane foam sheet, which is one material, is arbitrarily selected, but is 1 to 5 mm.
The degree is preferred. Polyurethane foam sheet is
Since it is sliced much thinner than the mu-block, it has good air permeability, and fresh air is always supplied to the surface of fruits and the like.

The thermoplastic resin sheet and the polyurethane foam sheet have their contact surfaces integrated with each other when completed as a packaging tray, but the timing of their integration is specified. Not a thing. That is, the thermoplastic resin sheet is formed into the shape of a packaging tray by vacuum forming or pressure forming. At this time, the thermoplastic resin sheet and the polyurethane foam sheet are superposed, It is preferable that the surface of the polyurethane foam sheet is melted by utilizing heat during the molding step, and thereby the thermoplastic resin sheet and the polyurethane foam sheet are welded and integrated.

[0010]

EXAMPLES The present invention will now be described in more detail based on examples. FIG. 1 is a partially cut side view showing a tray A for packaging fruits and the like according to the present invention. In the figure, 1 is a polyurethane foam sheet and has a thickness of about 2 mm. Further, 2 is a polypropylene resin sheet. And packaging tray A
The whole is composed of these two sheets 1 and 2, and further, a recessed portion 3 for accommodating fruits and the like is formed.

Further, referring to the recessed portion 3 of the packaging tray as a center, the inner peripheral surface of the recessed portion 3 is made of the polyurethane foam sheet 1 and therefore, for storing fruits and the like. Even so, the cushioning property becomes extremely high, and the air permeability is good, so that the damage to the fruit is also reduced. On the other hand, since the entire outer periphery of the packaging tray A including the outer peripheral surface of the recessed portion 3 is made of the polypropylene resin sheet 2, the recessed portion 3 is used not only for the shape retention of the entire packaging tray A. This means that it withstands vibrations during transportation and prevents load shifting and fruit contact.

The polyurethane foam sheet 1 and the polypropylene resin sheet 2 constituting the packaging tray A are, for example, the surface of the polyurethane foam sheet 1 melted by a flame, and the polypropylene is placed therein. Resin sheet 2
A method is employed in which the concave portions 3 are formed by pressure-bonding and integrating the laminated composite sheets.

FIG. 2 shows an outline of a method for forming a tray for packaging fruits and the like by this method. The surface of the polyurethane foam sheet 1 is burned with a flame a, and only the surface is melted. The polypropylene resin sheet 2 is pressed. Then, the polypropylene resin sheet 2 is vacuum-molded to form a recess 3 in the polypropylene resin sheet 2 to form a tray for packaging fruits and the like. Of course, although not shown, the recessed portion 3 can be formed by pressure molding.

On the other hand, there is also a means for bonding and integrating the two by utilizing the heat when forming the recessed portion 3, and when the recessed portion 3 is heat-press molded into the polypropylene resin sheet 2, the recessed portion 3 is recessed. Polyurethane foam sheet 1 on the inner peripheral side of part 3
And the surface of the polyurethane foam sheet 1 is melted by utilizing the residual heat during pressure molding.
By this, the polypropylene resin sheet 2 is bonded.

FIG. 3 is a schematic molding method of a tray for packaging fruits and the like according to this method. By superposing a polyurethane foam sheet 1 and a polypropylene resin sheet 2 and heat-pressing them c. The recessed portion 3 is formed, and the residual heat at this time is used to bond the two together to form a tray A for packaging fruits and the like.

[0016]

INDUSTRIAL APPLICABILITY The packaging tray of the present invention does not damage the stored fruit like the conventional packaging tray and does not deviate during transportation, so that the fruit can be reliably stored and transported. In addition, the production cost of the packaging tray has been reduced.

[Brief description of drawings]

FIG. 1 is a partially cut side view showing a tray for packaging fruits and the like according to the present invention.

FIG. 2 is a schematic diagram of a molding method 1 for a tray for packaging fruits and the like according to the present invention.

FIG. 3 is a schematic diagram of a molding method 2 for a tray for packaging fruits and the like according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Polyurethane foam sheet, 2 ... Polypropylene resin sheet, 3 ... Fruit storage recessed portion, A ... Tray for packaging fruits of the present invention, a ... Flame, b ... Vacuum forming , C ... Heat and pressure molding.

Claims (3)

[Claims] 1. A packaging tray having a recess for storing fruits and the like, comprising a laminated sheet of a thermoplastic resin sheet and a polyurethane foam sheet, the polyurethane foam sheet comprising: A tray for packaging fruits and the like characterized in that the inside of the recessed portion is. 2. The tray for packaging fruits and the like according to claim 1, wherein the recess is formed by vacuum forming or pressure forming. 3. The tray for packaging fruits and the like according to claim 2, wherein the thermoplastic resin sheet and the polyurethane foam sheet are integrally bonded together when the recess is formed.