JP2011168277A - Cutting line for plastic sheet, plastic sheet equipped with the same, and packaging case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a cutting line for a plastic sheet, which can be easily opened, in which opening can be clearly confirmed, and which can decrease possibility of a hand touching a burr when it is cut off or thereafter in relation to the cutting line provided on the plastic sheet. <P>SOLUTION: The cutting line having a configuration in which, when the sheet is seen in plan view, penetrating lines 2 equipped with a constitution in which crest parts 2A and valley parts 2B are alternately repeated through mountain side parts 2C, and on the crest parts 2A and the valley parts 2B, recessed parts 2D and 2E recessed in the opposite direction of the projecting direction of the crest parts 2A and the valley parts 2B are provided, and penetrated in the sheet thickness direction, are equipped, and in respective recessed parts 2D and 2E, non-penetrating parts 3 which do not penetrate in the sheet thickness direction are equipped, is proposed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plastic sheet tear line provided on, for example, a plastic sheet constituting a packaging case.

  A packaging case for packaging cosmetics, toys, and the like is formed of a highly transparent plastic sheet in order to display products with good appearance while protecting the products. For example, a sheet formed of polyethylene terephthalate (PET), polypropylene (PP), particularly amorphous polyethylene terephthalate (A-PET), etc. is punched into a desired shape, and a ruled line is put at the bent portion to form a plastic sheet for case assembly. An assembly formed by an automatic box making machine or the like is known (see Patent Document 1).

  For example, in Patent Document 2, an opening / closing plate portion that closes the opening surface from the edge of the plate portion, which is one side surface of the case, is continuously provided, and an insertion piece is extended to the front end of the case via a folding line, and intersects the plate portion. The case has a case configuration in which folding pieces are continuously provided from the edge of the plate portion on the other side having a directional surface through a folding line, and the insertion pieces are inserted along one side of the folding piece in a closed state. A plastic sheet, in which a notch is formed from both sides at the boundary between the insertion piece and the opening / closing plate portion, and a locking portion to which the notch portion can be engaged protrudes from the base portion of the one side of the folding piece. It is disclosed that a plastic sheet for packaging is configured by forming a concave portion in the base direction of the folded piece at a stepped portion formed at the tip of the locking portion.

  In recent years, the safety of even a packaged product has been questioned due to the incident that foreign matter is mixed in the distribution process of the product. Accordingly, the present inventor has conceived that a packaging case made of a plastic sheet is provided with a tear line in the packaging case so that when the package is opened, it can be clearly seen that the package has been opened.

  As a case provided with this type of cut line, for example, in Patent Document 3, a cardboard case is disclosed. A flap formed on a cardboard is provided with a zipper, a perforation, a tape, etc., and a re-sealing insertion tongue. A cartridge packaging box is disclosed, which is provided with a piece and an insertion port for inserting the insertion tongue piece.

  Moreover, although it is regarding a paper case, in patent document 4, it is a carton for hold | maintaining multiple articles | goods, such as cans, Comprising: The said carton is a bottom wall panel and side wall panel for forming a cylindrical structure. And a plurality of panels including a top wall panel, the top wall panel comprising a cut-out panel delimited on both sides by a zipper that breaks when opening the carton, the zipper being carton from one surface of the carton A half-cut line stamped in the thickness direction of the carton and a half-cut line stamped in the thickness direction of the carton from the other surface of the carton, the half-cut lines being separated from each other in a parallel direction A carton is disclosed that extends and at least one of the half-cut lines is a continuous wavy half-cut line.

JP 2001-139019 A JP 2001-171645 A Claim 1 of JP-A-5-124638 Claim 1 of JP-A-2005-255210

  When a cut line is provided in a plastic sheet, it is difficult to cut the material in comparison with corrugated cardboard or paper. Therefore, simply providing the cut line disclosed in Patent Documents 3 and 4 cannot be easily opened when it is desired to open the sheet. I had it. Also, in the case of plastic sheets, sharp protrusions (called “burrs”) are likely to occur when cut along the cut line, and in the case of plastics, the burrs are particularly sharp and hard. Or, there was a risk of injury by touching the burr afterwards.

  Therefore, the present invention relates to a tear line provided on a plastic sheet, which can be easily opened when it is desired to open, and when opened, it can be clearly confirmed that it has been opened, and the burrs can be touched when detached or thereafter. We intend to propose a cutting line for plastic sheets that can reduce the possibility.

  In view of such a problem, the present invention is a cut line for plastic sheet provided in a plastic sheet, and when the sheet is viewed in plan, the ridges and valleys are alternately repeated. Provided with a recess recessed in the direction opposite to the projecting direction of the peak and valley, provided with a through-line penetrating in the sheet thickness direction, and does not penetrate in the recess in the sheet thickness direction We propose a cutting line for plastic sheets with non-penetrating parts.

  If it is the tear line of such a structure, it can open easily when it wants to open, and when it opens, it can confirm clearly that it opened. In addition, a recess recessed in the direction opposite to the protruding direction of the peaks and valleys is provided, and a non-penetrating portion, i.e., a portion that becomes a burr, is provided in this recess, so that the Therefore, it is possible to reduce the possibility that the hand touches the burr at the time of separation or after the separation.

It is the top view which showed an example of the tear line which concerns on this invention. It is the enlarged plan view which showed an example of the tear line which concerns on this invention. It is the top view which showed the state which cut | disconnected the plastic sheet to the middle of the cutting line along an example of the cutting line which concerns on this invention. (A) (B) is a top view for demonstrating the dimension in an example of the tear line which concerns on this invention. (A)-(E) is the top view which showed the example of the planar view shape of the cutoff line which concerns on this invention. It is the figure which showed the example at the time of providing the bulging part as an example of the cutoff line which concerns on this invention, (A) is a top view, (B) is the BB sectional drawing. It is the figure which showed the other example at the time of providing the bulging part as an example of the cutoff line which concerns on this invention, (A) is a top view, (B) is the BB sectional drawing. It is the figure which showed the further another example at the time of providing the bulging part as an example of the tear line which concerns on this invention, (A) is a top view, (B) is the BB sectional drawing. It is a top view showing an example at the time of providing an example of a tear line concerning the present invention in a plastic sheet in order to explain a state where a tear line concerning the present invention was provided in a plastic sheet. Similarly, in order to explain the state where the cut line according to the present invention is provided in the plastic sheet, it is a plan view showing another example in the case where an example of the cut line according to the present invention is provided in the plastic sheet. It is sectional drawing for demonstrating the cross-sectional shape of the non-penetrating part of the tear line which concerns on this invention, (A)-(C) shows each different example. It is the top view which showed the unfolded state of the plastic sheet for case assembly which formed an example of the cut line which concerns on one Example of this invention. FIG. 13 is a top perspective view showing a packaging case in which the case assembling plastic sheet of FIG. 12 is assembled. It is the upper perspective view which showed the unsealed state of the packaging case of FIG. It is the top view which showed an example of the expansion | deployment state of the plastic sheet for case assembly different from FIG. When providing the cut line which concerns on this invention in a plastic sheet, it is the top view which showed an example in the case of providing a cutting part in the edge part of a cut line.

  Hereinafter, an exemplary embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiment.

<Cut line>
The cut line 1 for a plastic sheet according to an example of the present invention is a cut line provided in a plastic sheet. As shown in FIG. 1-2, when the sheet is viewed in plan, the peak portion 2A and the valley portion 2B are the middle portion. The sheet thickness is formed by alternately repeating 2C through the crests 2D and 2E, and the crests 2A and troughs 2B are provided with recesses 2D and 2E that are recessed in the direction opposite to the protruding direction of the crests 2A and troughs 2B. This is a cutoff line having a configuration in which a through-line 2 penetrating in the direction is provided and a non-penetrating part 3 that does not penetrate in the sheet thickness direction is provided in each of the recesses 2D and 2E.

As shown in FIG. 1-2, the plan view shape of the cut line 1 may be a shape having a wavy shape in which crests 2A and troughs 2B each having a round crest shape are alternately repeated, and FIG. A) As shown in FIG. 5 (C), it may have a wavy shape in which peaks 2A and valleys 2B having a heart shape are alternately repeated. The shape may be such that the peaks 2A and valleys 2B are alternately repeated, and as shown in FIG. 5D, the trapezoid peaks 2A and valleys 2B are alternately repeated. In addition, as shown in FIG. 5E, a shape in which rectangular peaks 2A and valleys 2B are alternately repeated may be used.
At this time, when the plastic sheet is cut along the cut line 1, in order to minimize the occurrence of an angular portion after the separation, in the shapes as shown in FIGS. It is preferable to form so as to have it.

(Recesses 2D and 2E)
The shape of the recesses 2D and 2E can be arbitrarily designed as long as it can prevent the finger touching the peak 2A or the valley 2B from entering the recesses 2D and 2E after cutting the cut line 1. is there. For example, it can be arbitrarily designed such as a narrowed shape or a rectangular shape.
Further, as shown in FIG. 4 (A), the end of the penetrating line 2 facing in the direction opposite to the protruding direction of the peak 2A and the valley 2B is opened at the center to form a non-penetrating part 3. As shown in FIG. 4 (B), the end of the penetrating line is in the shape of the non-penetrating part 3 by opening the center part with the end part facing the length direction of the cut line 1. May be.
Regarding the number of recesses 2D or 2E in the ridges 2A or valleys 2B, as shown in FIG. 1, one ridge 2D or 2E may be provided in each peak 2A and valley 2B, As shown in FIG. 5B, two or more recesses 2D or 2E may be provided in each peak 2A and valley 2B.

  The non-penetrating portions 3 provided in the recesses 2D and 2E may be provided in the central portion in the recesses 2D and 2E, or two or more may be provided in the recesses 2D and 2E.

The distance (pitch) H between the crests 2A and 2A and the troughs 2B and 2B on both sides of the recess 2D or 2E is preferably 0.5 mm to 20 mm. If it is 0.5 mm or more, processing is not difficult, and if it is 20 mm or less, it is difficult for a finger to enter between the peak portions 2A and 2A and the valley portions 2B and 2B on both sides of the recess 2D or 2E. Therefore, it is possible to effectively prevent the finger from touching the burr.
Therefore, from this point of view, the distance H is more preferably 0.5 mm to 20 mm, and particularly preferably 1 mm to 10 mm.

  The depth h of the recess 2D or 2E is preferably 0.5 mm to 20 mm. If it is 0.5 mm or more, the finger can be effectively prevented from touching the burr, and if it is 20 mm or less, the processing is not difficult. Therefore, from this viewpoint, the depth h is more preferably 0.5 mm to 15 mm, and particularly preferably 1 mm to 10 mm.

(Bulging part 4)
As shown in FIG. 6 to FIG. 8, when viewed in plan, the bulging portion 4 (4A, 4B) having a portion swelled in the thickness direction in a region within the amplitude sandwiched between the peak portion 2A and the valley portion 2B. Can also be provided.
The bulging portion 4 is preferably provided in the vicinity of the non-penetrating portion 3 that is a source of burrs, and is formed so that the bulging portion 4 does not interfere with a finger or the like.
If the swollen portion 4 has a portion swollen in the thickness direction in an amplitude inner region sandwiched between the peak portion 2A and the valley portion 2B, the entire swollen portion 4 exists in the amplitude inner region. Alternatively, a part of the bulging portion 4 may exist in the amplitude inner region, and the entire bulging portion 4 may not exist in the amplitude inner region.
Here, the bulging part 4 shown in FIG. 6 is surrounded by the adjacent peak parts 2A and 2A, and the amplitude inner region sandwiched between the peak part 2A and the valley part 2B, and the adjacent valley part. 2B, 2B, and one bulged portion 4 having a contour along the cutoff line 1 is provided in each of the amplitude inner regions sandwiched between the peak portion 2A and the valley portion 2B. When the plane is viewed in plan view, the bulging direction of the bulging portion 4A provided on the side to be cut off when cutting along the cutoff line 1 and the bulging direction of the bulging portion 4B provided on the uncut side are provided in opposite directions. is there.
The entire bulging portion 4 shown in FIG. 7 has a belt shape along the continuous direction of the cutoff line 1, and is one bulging provided on the side to be cut off when the sheet is cut along the cutoff line 1 when viewed in plan. 4A and one bulging portion 4B provided on the uncut side, and the bulging direction of the bulging portion 4A and the bulging portion 4B is opposite to each other. Each of the protruding portions 4B is formed in a shape having an outline along the cutoff line 1 on the cutoff line 1 side.
Moreover, the bulging part 4 may be made to provide one bulging part 4 between the adjacent peak parts 2A and the peak parts 2A, or two or more.
The shape of the bulging portion 4 is not particularly limited, and may be any shape such as a triangular shape, a quadrangular shape, a round shape, or a belt shape.
The bulging direction of the bulging portion 4 may be formed so that all the bulging portions 4 bulge to one side, but when cutting the cut line 1, the side to be separated is pulled upward (before the paper surface). Then, in the non-penetrating part 3 on the separating side, the burr extends toward the uncut side, that is, downward (back side of the paper surface), so that the bulging part 4 on the separating side swells downward (back surface side of the paper surface). On the contrary, the non-penetrating portion 3 on the side to be left uncut has a burr extending toward the side to be cut off, that is, upward (front side of the paper), so that the bulging portion on the side to be left uncut 4 is preferably formed so as to swell upward (front side of the sheet).
Thus, when the sheet 1 is viewed in plan, the bulging direction of the bulging part 4 provided on the side to be cut off when the sheet 1 is cut along the cutoff line 1 and the bulging direction of the bulging part 4 provided on the side to be left uncut. In the opposite direction.
The height at which the bulging portion 4 bulges in the thickness direction may be adjusted as appropriate. As described above, since the thin portion 3A that is left without penetrating forms a burr, the thickness d of the thin portion 3A assumes that this portion extends twice as long to form a burr. The length is preferably larger than any of the lengths l, larger than 5 × d, and more preferably larger than 10 × d. Further, it is more preferably larger than 5 × 1, more preferably larger than 10 × l.

As shown in FIG. 9, the cutoff line 1 is curved so that the entire cutoff line 1 is curved in a single arc shape when seen in plan view in order to prevent the plastic sheet from being bent along the cutoff line 1 when sealing the box. It is preferable to form it.
At this time, the distance between the most protruding top of the arc and the straight line (string) connecting both ends of the arc is 1 mm to 10 mm, particularly 2 mm to 5 mm, from the viewpoint of preventing the plastic sheet from being bent and being easily cut. It is preferable to do this.
Furthermore, from the viewpoint that burrs generated on the side left uncut when cutting is difficult to touch, it is preferable that the side left uncut is curved so as to be recessed.
However, the cut line 1 may be formed linearly.

In addition, the cutting line 1 may be a cutting line in which two cutting lines 1 and 1 are arranged in parallel at a predetermined interval as shown in FIG.
However, in the cut line formed by arranging the two cut lines 1 and 1 side by side at a predetermined interval, the band-like portion 5 sandwiched between the two cut lines 1 and 1 becomes dust, thus preventing the generation of dust. From this point of view, it is preferable that one cutting line 1 constitutes a cutting line.

(Non-penetrating part 3)
The length 1 of the non-penetrating portion 3 is preferably 0.1 mm to 1 mm. If it is within 1 mm, it will not be difficult to cut, and if it is 0.1 mm or more, it will not be cut during normal use. Therefore, from this viewpoint, the length 1 of the non-penetrating portion 3 is more preferably 0.1 mm to 1 mm, and particularly preferably 0.2 mm to 0.5 mm.

The thickness of the non-penetrating portion 3 can be left as it is in the sheet, but as shown in FIGS. 11A to 11C, a groove 3B is provided, and the thin wall is thinner than the sheet surface. It can also be formed so as to remain as part 3A.
As shown in FIG. 11 (A), groove portions 3B may be provided on both upper and lower sides of the sheet surface so as to leave a thin portion 3A in the middle, or as shown in FIG. You may provide the groove part 3B in the up-down one side. At this time, as shown in FIG. 11C, the groove 3B may be provided so as to gradually become narrower from the opening.
Thus, when providing groove part 3A, it is more preferable to form so that the whole cutting line 1 including groove part 3A may exhibit a smooth wavy shape in planar view, for example so that a sine curve may be exhibited.
In addition, since the thin portion 3A that is left without penetrating forms a burr, the thickness d and length l of the thin portion 3A that remains without penetrating this portion is doubled to form a burr. In consideration of the above, it is preferable to form it to be smaller than ½ of the depth h. In other words, the thickness d of the thin-walled portion 3A is preferably about half the thickness of the plastic sheet, so that the depth h is greater than 2 × d, further greater than 5 × d, and more particularly 10 It is more preferable to make it larger than xd. Furthermore, it is more preferable that the depth h is larger than 2 × l and further larger than 5 × l.

(Use)
The plastic sheet cutting line 1 described above is suitable for providing, for example, a plastic sheet for constituting a packaging case. However, it can also be provided on a plastic sheet used for other purposes.
At this time, the material of the plastic sheet is not particularly limited. For example, amorphous polyethylene terephthalate (A-PET), polypropylene, polyethylene, polystyrene, polycarbonate, polylactic acid, or a polymer blend composed of a combination of two or more of these has good transparency and high rigidity. A preferred example is a synthetic resin.

  The cut line 1 can be provided on a plastic sheet by using a cut line forming blade provided with a non-cutting portion at an appropriate position of a cutting blade having a predetermined plan view shape, for example. However, it is not limited to this method.

[Explanation of terms]
In the present invention, when expressed as “X to Y” (X and Y are arbitrary numbers), “X is preferably greater than X” and “preferably Y”, with the meaning of “X to Y” unless otherwise specified. It is meant to include “less than”.
Further, in the present invention, when expressed as “more than X” (X is an arbitrary number), unless otherwise specified, it means “preferably greater than X” and includes “Y or less” (Y is an arbitrary number) When expressed as (numerical), it means “preferably smaller than Y” unless otherwise specified.

  Hereinafter, as an embodiment of the present invention, a plastic sheet 50 on which a cut line 1 is formed will be described with reference to the drawings. However, the present invention is not limited to the examples described below.

A plastic sheet 50 shown in FIG. 12 is an example of a plastic sheet for assembling a packaging case in which a cut line 1 is formed.
In the plastic sheet 50, left and right side plate portions 52, 53 and a back plate portion 54 are connected to the left and right sides of the front plate portion 51 through folding lines (ruled lines) 70, respectively, and the side edges of the back plate portion 54 are connected. Further, the adhesive margin 55 is continuously provided via the folding line 70, and the upper surface plate part 56 or the bottom surface plate part 57 is provided continuously from the upper edge and the lower edge of the front plate part 51 via the folding line 70. An insertion piece 58 or 59 is extended at the tip, and folding pieces 60, 61, 62 or 63 are connected from the upper and lower edges of the left and right side plate parts 52 and 53 via a folding line 70, respectively, and the back plate part 54. A fixed piece 64 or 65 is connected to the upper edge and the lower edge of each through a folding line 70, and the cut line 1 is provided in the upper plate 56.

  The cutoff line 1 is on the root side from the center in the upper surface plate portion 56, that is, closer to the folding curve 70 with the front plate portion 51, and on the folding curve 70 side with the front plate portion 51 over the entire width of the upper surface plate portion 56. It is formed in an arc shape.

  Note that the position where the cutoff line 1 is provided in the upper surface plate portion 56 is arbitrary. In short, as shown in FIG. 12, the position where the cut line 1 is provided is arbitrary as long as the portion to which the fixing piece 64 is fixed and the other portion can be divided in the upper surface plate portion 56. However, from the viewpoint of ease of cutting, it is preferable to provide over the entire width from the center in the upper surface plate portion 56 to the root side portion, that is, the portion closer to the folding line 70 with the front plate portion 51.

The left and right end portions of the cut line 1 are cut out in a curved shape from the left and right side edges of the upper surface plate portion 56 to the inside of the width as appropriate so as to easily start cutting along the cut line 1 (cut portions 67 and 67). .
As shown in FIG. 16, the cut portion 67 is preferably formed by cutting into a curved shape that is rounded from the left and right side edges of the upper surface plate portion 56 to the inner side of the width as appropriate so as not to have an angular portion.

Although the cut line 1 is not clearly shown in FIG. 12, the crest 2A and the trough 2B are alternately repeated through the middle abdomen 2C, and the wavy line is continuously formed. Constricted concave portions 2D and 2E are provided in 2B, and the central portions of the concave portions 2D and 2E are opened to provide non-penetrating portions 3.
As shown in FIG. 11C, the non-penetrating portion 3 is formed by providing a groove portion 3B, which gradually becomes narrower from the opening portion, on one surface of the sheet, and the depth of the groove portion 3B is 1 of the sheet thickness. / 2, that is, the thickness d of the thin portion 3A is ½ of the sheet thickness.
However, the shape and the like of the cutoff line 1 are as described above, and can be changed as appropriate.

The plastic sheet 50 having the above configuration can assemble the packaging case 75 as follows.
As shown in FIG. 13, the front plate portion 51, the left and right side plate portions 52, 53 and the back plate portion 54 are each bent through a folding line 70, and the adhesive margin 55 is fixed to the back surface of the left and right side plate portions 52. The main body 71 is assembled. Next, the folding pieces 61 and 63 are folded into the bottom surface, the bottom plate portion 57 is folded into the bottom surface, and the insertion piece 59 is inserted into the container main body portion 71 and engaged, and then the fixing piece 65 is fixed to the bottom plate portion. The bottom surface 72 is formed by adhering to 57 using an adhesive or the like. Next, after storing the product or the like in the container main body 71, the folding pieces 60 and 62 are folded into the upper surface, the upper plate 56 is folded into the upper surface, and the insertion piece 58 is inserted into the container main body 71. After the engagement, the packaging case 75 can be assembled by fixing the fixing piece 64 to the upper surface plate portion 56 using an adhesive or the like to form the upper surface 73.

  In the packaging case 75 assembled in this way, the upper surface plate portion 56 and the lower surface plate portion 57 are fixed (fixed) to the container body portion via the fixing pieces 64 and 65, and therefore the upper surface plate portion along the cutting line 1. There is no method of opening other than cutting 56, and as shown in FIG. 14, the upper surface plate portion 56 can be cut along the tear line 1 and easily opened. And once the cutoff line 1 is cut off, it is impossible to connect it as it was, so it is possible to clearly confirm whether or not the opening has been opened.

  FIG. 15 shows a plastic sheet 80 as another example of the plastic sheet 50. At this time, since the plastic sheet 80 has the same configuration as the plastic sheet 50, the same components as those of the plastic sheet 50 are denoted by the same reference numerals, and only different portions will be described.

As shown in FIG. 12, the plastic sheet 80 has not only the top plate portion 56 but also the bottom plate portion 57 provided with a cut line 1.
In addition, although the board part which provides the cutting line 1 and the number are arbitrary, providing the cutting line 1 in the upper surface board part 56 and the bottom face board part 57 like the plastic sheet 80 will enable small folding at the time of disposal. Benefits can be obtained.

The upper plate 56 is provided with two cut lines 1 and 1 parallel to each other at a predetermined interval so that the band-like part 5 sandwiched between the two cut lines 1 and 1 can be separated.
Further, it is provided at a position slightly closer to the tip side, that is, the insertion piece 58 side than the center in the upper surface plate portion 56.
On the other hand, the bottom plate portion 57 is formed with a single cut line 1 over the entire width at the center of the bottom plate portion 57.
The detailed structure of the cut line 1 is as described above.

DESCRIPTION OF SYMBOLS 1 Cut line 2 Through-line 2A Mountain part 2B Valley part 2C Middle part 2D Concave part 2E Concave part 3 Non-penetrating part 3A Thin part 3B Groove part 4 Swelling part 5 Band-like part 50 Plastic sheet 51 Front side plate part 52 Left side board part 53 Right side board part 54 Back plate part 55 Adhesive allowance 56 Top plate part 57 Bottom plate part 58, 59 Insertion piece 60, 61, 62, 63 Folding piece 64, 65 Fixing piece 67 Cutting part 70 Folding curve 71 Container body part 72 Bottom face 73 Upper surface 75 Packaging case

Claims (4)

A plastic sheet cutting line provided on a plastic sheet,
When the sheet is viewed in plan, the crests and troughs are alternately repeated, and the crests and troughs are provided with recesses that are recessed in the direction opposite to the protruding direction of the crests and troughs. In addition to having a through-line that penetrates in the sheet thickness direction,
A plastic sheet cut line having a non-penetrating portion that does not penetrate in the sheet thickness direction in the recess.   The cut line for a plastic sheet according to claim 1, wherein the plastic sheet is curved as a whole when viewed in plan.   A plastic sheet comprising the plastic sheet cutting line according to claim 1.   A packaging case made of the plastic sheet according to claim 3.

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