JPS5827096B2 - Method for manufacturing individual packaging net made of thermoplastic resin foam - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for manufacturing individual packaging nets made of thermoplastic resin foam, and is suitable for packaging fruits such as apples and pears, glassware, pottery, etc. It is intended to be provided simply and efficiently.

One way to obtain a conventional individual packaging net that can individually wrap fruits such as apples and pears, as well as individual packaging items such as glassware and ceramics, is to roll a foam sheet once and roll it up. This method involves heat-sealing the butted side edges, and staggered cuts are made in the foam sheet to make it easier to expand, but in this case, the process of rolling up a single foam sheet is required, making it non-trivial. Not only is it inefficient and unsuitable for mass production, but the individual packaging nets provided also have a cylindrical shape with the same diameter as a whole, making it difficult to insert the items to be packaged, especially for packaging spherical items such as apples and pears. It was also difficult to fit in the external shape.

Another method involves diagonally crossing thermoplastic resin strings and heat-sealing the crossing points to form a tip tube with the same diameter, but in this case as well. Since they had the same diameter, they were manufactured so that the overall length was about twice the required length, and when used, the center was squeezed with a rubber band, and then the halves were turned over and used in a double layered state.

However, in this conventional technology, the heat sealing at the points where the strings intersect is troublesome and tends to be insufficient, and the net tends to come off when the net is expanded, and the thickness increases by twice the edge thickness due to the intersecting strings. The heavy state is essentially a bulky quadruple state.

Moreover, when in use, the end tubes of the same diameter are squeezed with a rubber band, so the strings become more densely packed toward the bottom, making it difficult to open the net mesh, making it difficult to see the bottom of the packaged item, which reduces the display effect. There was also a lot of room for improvement.

Therefore, the present invention is a simple and efficient method that enables the mass production of individual packaging nets that are suitable for use. The sheets are stacked and run, and the ends of the individual net are cut by shifting the half of the individual net in adjacent parts in the direction crossing the running direction, and the cuts are made at the same time as the above-mentioned cutting of both ends. Alternatively, a large number of staggered cuts may be formed separately, and the individual nets may be used as diagonal both ends to form a substantially drum shape in a step separate from the above-mentioned cutting of both ends and the formation of the staggered cuts. The two foam sheets are heat-sealed to each other by shifting half of the individual nets in adjacent parts in a direction that intersects with the running direction, and each individual net is cut to form a roughly drum-shaped sheet. The purpose is to obtain a plurality of individual nets.

Next, embodiments of the present invention will be illustrated below with reference to the drawings.

First, reference numerals 1 and 1 in FIG. 1 are two foamed sheets made of thermoplastic resin superposed one on top of the other, preferably foamed polyethylene sheets, for example.

A and a are holding points at both ends of the foamed sheets 1 and 10, and a chain conveyor with needles b is suitable, and the foamed sheets 1.1 are moved in a taut state in an intermittent manner.

C is a cutter that cuts both ends of the individual net and forms staggered cuts at the same time, d is a cutter pedestal, e is a fusing tool for oblique both ends to make it approximately drum-shaped, and f is a fluororesin processing tool. This is a cradle for fusing.

And for the foam sheets 1 and 1 that are run intermittently,
A part of the cutter C is used to form cuts at both ends 2, 2 of the individual packaging net in a direction crossing the running direction, and a large number of staggered cuts 6 are made on the other part of the same cutter C.
, 6.

The cuts at both ends 2, 2 are formed so as to sequentially shift half of the individual net at adjacent parts in the direction intersecting the running direction, while the staggered cuts 6°6 are for the individual net. It is formed so that the closer it is to the cuts at both ends, which will be described later, with the center portion PP as a boundary, the more parallel it becomes to the oblique cuts for both ends.

Next, the slanted side edges 4 to make the individual net approximately drum-shaped,
4, the stacked foam sheets 1, 1 are heat-sealed 5°5 to each other at position B, and the individual pieces are formed at the portions that will become the both side ends 4, 4. A cut is made for each loaded net, and this heat fusion and cutting can be done simultaneously and easily by the fusing action of the fusing tool e, and the cut crosses the running direction as well as the 2°2 cut at both ends described above. It is formed so that adjacent parts in the direction are sequentially shifted by an amount equivalent to half of the individual packaging net (H).

In this way, a plurality of individually wrapped nets (N) are obtained, but in order to facilitate collection, the individual individually wrapped nets (N) are not completely separated, but both ends are cut or both ends are cut. 4,
It is preferable to leave an uncut portion 8 in a part of the individual packaging net N at the end of the cut in step 4, and in the case of the figure, both ends 2
, 2, there is an uncut portion 8.

In the above embodiment, the case where the heat fusion bonding 5.5 and the cutting as the both ends 2, 2 are performed at a stage after finishing cutting at both ends and forming zigzag cuts is illustrated, but in a stage before these. Alternatively, cutting both ends and forming staggered cuts may be performed at the same time as described above, or if they are performed in separate processes, heat fusion bonding 5, 5 as both ends 4, 4 may be performed. It is also possible to perform the cutting and the cutting in the process between the cutting at both ends and the formation of the staggered cuts.

In addition to the polyethylene mentioned above, polypropylene and other flexible foam sheets can be used as the foam sheets 1, 1 used in the above manufacturing, and the staggered cuts 6, 6 are formed in the area excluding the center 3 or its vicinity. As described above, it is useful to provide an individual net that is easy to expand because the closer to the both sides 4, 4 the closer the net is to the sides of the center PP, the more parallel they are to each side.

Further, the cut shape of both ends 2, 2 of the individual packaging net N may be formed in a straight line as shown in FIG. If it is formed into a line, when the item to be packaged is inserted and expanded, both wide ends 2
, 2 is preferable as a shape that easily changes to a straight state and takes into account the shape after individual packaging.

In addition, for the individually packaged netsu) N, the wide ends 2, 2 are cut at a part of the staggered cut 6°6, and the staggered cut 6°6 ends a little before the narrow center 3. , the center 3 or its vicinity is formed as a remaining portion 7, 7 without a cut 6, 6, which serves to prevent the individually packaged net ()H from expanding at the lower end during use.

It should be noted that manufacturing equipment and other means used may be other than those mentioned above, such as a roll type instead of the cutter 〇, a combination of a heat sealing tool and a slitter instead of the fusing tool e, etc. can.

In addition, in practice, in addition to cutting both ends, forming staggered cuts, and forming both ends in a row perpendicular to the traveling direction of the foam sheet, it is also possible to process multiple rows at a time, such as two rows at a time. Adapt the running of the foam sheet to the number of rows.

When manufactured by the above method, the individual packaging net N has both ends 4 which are heat-sealed 5, 5 so that the width is wide at both open ends 2, 2, and the width is narrow at the center 3. , 4 are slanted and have a generally drum-shaped overall shape, and are arranged so that adjacent parts in the direction intersecting the running direction of the foam sheet are shifted by half of the individual packaging net. Since the individual packaging nets N are obtained one after another, the foam sheets 1, 1 can be used without wasting any length and are easy to manufacture.

And when using individual individual nets N, the narrow center 3
One half 10 is then turned over to enclose the other half 20 (see FIGS. 5 to 7).

Therefore, unlike conventional products, there is no need to use a rubber band in the center to squeeze cylinders of the same diameter.

In addition, the production of individual packaging nets using the above method is much simpler and more efficient than the conventional method of rolling each foam sheet into a tube and heat-sealing the butted side edges. This means that a unique individual net with wide and narrow widths will be provided.

On the other hand, compared to the conventional method in which the strings are formed by crossing each other, the net pattern is easier to form because it uses staggered cuts, and there is no possibility of it coming off like when heat-sealing points at the points of intersection, and it is easier to form the nets when used. The mesh of the net at the heavy part becomes a cut that is easy to align all the way down to the lower part, and moreover, it is possible to manufacture an individually wrapped net that is less bulky than a net made of string.

Therefore, according to the method of the present invention, it is possible to provide an individual packaging net having a unique structure, and it can also contribute to the mass production of individual packaging nets, especially for fruits such as apples and pears that require a large amount of individual packaging nets, and glassware. This makes it possible to provide an inexpensive individual wrapping net suitable for individually wrapping objects such as pottery.

[Brief explanation of drawings]

The figures illustrate embodiments of the present invention; Fig. 1 is a partially cutaway schematic plan view showing the change from a foam sheet to an individual packaging net, with some staggered cuts omitted; The figure is a side view, FIG. 3 is an enlarged plan view of a portion of the formed individual packaging net, FIG. 4 is an enlarged plan view of a portion of the modified individual packaging net, and FIG. 1 of the individual nets in both figures
Figure 6 is a partially cutaway front view of one half folded over and wrapped around the other half, Figure 7 is a sectional view taken along the FIG. 8 is a front view in a state of use, and FIG. 9 is a sectional view taken along the line IX--IX in both figures. 1.1...Two stacked foam sheets, N.
...Individual net, 2, 2...Both ends, 3.
...Center, 4゜4...Both ends, 5,5.
...Heat-fused area, 6,6...Staggered cut, 7,7...Remaining part, 8,8...
Uncut portion, C...Cutter e...
Fusing tool.

Claims (1)

[Claims] 1. Two sheets of foamed sheets made of thermoplastic resin are stacked and run, and the individual packaging nets are separated by an amount equivalent to half of the individual packaging net in adjacent parts in a direction crossing the running direction. The ends of the wrapping net are cut, and a large number of staggered cuts are formed simultaneously or separately from the cutting of both ends, and the individual wrapping net is cut at a stage separate from the cutting of both ends and the formation of the staggered cuts. As a diagonal both ends to make it approximately drum-shaped,
Similarly to the above, two foam sheets are heat-sealed to each other by shifting half of the individual packaging nets in adjacent parts in the direction crossing the running direction, and each individual packaging net is cut. A method for manufacturing individual packaging nets made of thermoplastic resin foam, characterized by obtaining a plurality of individual packaging nets each having an hourglass shape. 2 Claim 1 above where the cuts at both ends are straight lines
A method for producing an individual packaging net made of a thermoplastic resin foam as described in 1. 3. A method for producing an individual packaging net made of a thermoplastic resin foam according to claim 1, wherein the cuts at both ends are made into arcuate lines that bulge outward from the individual packaging net. 4. The thermoplastic resin according to claims 1 to 3 above, wherein the cutting at both ends and the cutting at both ends are performed with an uncut portion left in a part of the individual packaging net. A method for manufacturing individual packaging nets made of foam. 5. The heat sink according to Claims 1 to 3 above, wherein the staggered cuts are formed so that the closer they are to both ends of the individual packaging net, the closer the staggered cuts are to the ends thereof. A method for producing an individual packaging net made of plastic resin foam.