JP5461953B2 - Cut line for plastic sheet, plastic sheet and packaging case provided with the same - Google Patents

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 plastic sheet for case assembly is formed by putting ruled lines at the bent portions. An assembly formed by an automatic box making machine or the like is known (see Patent Document 1).

  More specifically, in Patent Document 2, for example, an open / close plate part that closes the opening surface from the edge of the plate part that is one side surface of the case is continuously provided, and an insertion piece is extended to the tip thereof via a folding line, Folding pieces are continuously connected via a folding line from the edge of the plate portion on the other side having a plane intersecting the plate portion, and the insertion piece is inserted along one side of the folding piece in the closed state. A plastic sheet having a case configuration, wherein a cut is formed from both sides at a boundary between the insertion piece and the opening / closing plate portion, and the cut portion is engageable with a base portion of the one side of the folding piece. A wrapping plastic sheet is configured by projecting a locking portion and forming a recess in the base of the folded piece at the 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 kind of cut line, for example, in Patent Document 3, it is not a packaging case made of a plastic sheet, but a corrugated cardboard case, but a flap partitioned by a corrugated cardboard has a zipper, a perforation, a tape, etc. A cartridge packaging box is disclosed, which is provided with a cutting and opening portion, a re-sealing insertion tongue piece, and an insertion opening for inserting the insertion tongue piece.

  Moreover, although it is related not only to a packaging case made of plastic sheets but also to a paper case, in Patent Document 4, it is a carton for holding a plurality of articles such as cans, and the carton has a cylindrical structure. A plurality of panels including a bottom wall panel, a side wall panel and a top wall panel for forming, the top wall panel comprising a cut-out panel delimited on both sides by a zipper that breaks when opening the carton; The zipper consists of a half-cut line stamped in the thickness direction of the carton from one surface of the carton and a half-cut line stamped in the thickness direction of the carton from the other surface of the carton. A cart that extends in a direction parallel to and spaced from each other, wherein at least one of the half-cut lines is a continuous half-cut line There has been disclosed.

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 after that, there was a possibility that the hand touched the burr and was injured.

  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 a plastic sheet provided in a plastic sheet, and includes a penetration line that penetrates in the sheet thickness direction when the sheet is seen in a plan view, and is formed on the upper side or the lower side. While the surrounding shape having an opening made of a non-penetrating portion that does not penetrate in part in the sheet thickness direction, the opening portion follows the longitudinal direction line of the cut line while the adjacent surrounding shape and the vertical direction are alternately reversed. We propose a plastic sheet cutting line with a side-by-side configuration.

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. Moreover, the non-penetrating part, which is the source of burr, is on the upper side or the lower side of the surrounding shape, and any side of the plastic sheet that is cut off has a burr in the back surrounded by the upper and lower surrounding shapes. Since it is difficult to touch a hand or a finger, it is possible to reduce the possibility that the hand touches the burr after separation or after.
Also, since the surrounding shapes are engaged with each other in the horizontal direction, that is, the paper surface when viewing the figure, they do not detach in the horizontal direction, but on the top and bottom, that is, the paper front and back when viewing the figure Since it can be detached in the direction and oblique direction, it does not desorb naturally, but it can be easily cut off if it is to be detached.

(A)-(C) are all the top views which showed an example of the tear line which concerns on this invention. (A)-(C) are all the enlarged plan views of an example of the cutoff line shown in FIG. It is the top view which showed an example of the state of the cutting edge part of the cut | disconnected one side plastic sheet, when a plastic sheet is cut | disconnected along an example of the cutting line shown to FIG. 1 (A). 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. It is the top view which showed an example in the case of arranging two cut lines which concern on this invention in parallel with predetermined spacing. 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. It is the upper perspective view which showed the packaging case which assembled the plastic sheet for a case assembly shown in FIG. FIG. 9 is a top perspective view showing an opened state of the packaging case shown in FIG. 8.

  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 plastic sheet cutting line 1 according to the present invention is a cutting line 1 provided in a plastic sheet as shown in FIG. 1B. When the sheet is viewed in plan, the cutting line 1 penetrates in the sheet thickness direction. A plurality of surrounding shapes 1A, 1A,... Each having an opening 1B composed of a non-penetrating portion 3 that does not penetrate in the sheet thickness direction in a part of the upper side portion or the lower side portion. 1A is a cutoff line having a configuration in which 1A and the vertical direction are alternately reversed while being sequentially arranged in the longitudinal direction of the cutoff line 1.

At this time, the surrounding shape 1A formed of the penetrating line 2 is not particularly limited, and may be, for example, a semicircular shape, a fan shape, a triangular shape, or a square shape as shown in FIGS. What is necessary is just to provide the opening part 1B which consists of the non-penetrating part 3 in the upper side part or the lower side part, Preferably the center part.
Then, by alternately reversing the vertical direction in the longitudinal direction of the cutoff line 1, the end portions 1 C (through-line 2) on both sides of the opening 1 B are inserted into the opening of the adjacent surrounding shape 1 A, and a plurality of In other words, the end sides 1C can be arranged side by side so that the plurality of openings 1B are positioned along the longitudinal direction line of the cutoff line 1, and preferably on the longitudinal direction line of the cutoff line 1.

  If it is the tear line 1 of such a shape, it can open easily when it wants to open, and when it opens, it can confirm clearly that it opened. In addition, since the non-penetrating portion 3 that is the source of the burr is on the upper side or the lower side of the surrounding shape 1A, as shown in FIG. Since it occurs in the back surrounded by the surrounding shape 1A, it is difficult to touch hands and fingers. Therefore, the possibility that the hand touches the burr at the time of separation or after that can be reduced. In addition, since the adjacent surrounding shapes 1A are engaged with each other in the horizontal direction, that is, the paper surface direction when the figure is viewed, they are not detached in the horizontal direction, while the vertical direction, that is, when the figure is viewed. Since it can be detached in the direction of the front and back of the paper and in the oblique direction, it does not desorb naturally, but it can be easily cut off if it is to be separated.

The distance (pitch) H (see FIG. 1) between the adjacent surrounding shapes 1A and 1A 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 to put a finger between the surrounding shapes 1A and 1A, so that 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 amplitude width h (see FIG. 1) of the surrounding shape 1A, that is, twice the height of the surrounding shape 1A 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 amplitude width h is more preferably 0.5 mm to 15 mm, and particularly preferably 1 mm to 10 mm.

In order to prevent the plastic sheet from being bent along the cutoff line 1 when the box is sealed, the cutoff line 1 is curved in a single arc shape when viewed in plan, as shown in FIG. 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.

  As shown in FIG. 5, the cut line 1 is formed so that two cut lines 1, 1 are juxtaposed at a predetermined interval so as to cut a belt-like portion 5 sandwiched between the two cut lines 1, 1. However, it is preferable that a single wire constitutes a cutoff line. In a cutoff line formed by arranging two cutoff lines 1 and 1 side by side at a predetermined interval, since the band-like portion 5 sandwiched between the two cutoff lines 1 and 1 becomes dust, the viewpoint of preventing the generation of dust It is preferable that one cutting line 1 constitutes a cutting line.

  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 non-penetrating part 3 can be left as it is in the thickness of the sheet. However, as shown in FIGS. 6A to 6C, a groove 3B is provided, and the thin part 3A is thinner than the sheet surface. It can also be formed to leave.
As shown in FIG. 6 (A), groove portions 3B may be provided on both upper and lower sides of the sheet surface, and the thin wall portion 3A may be left 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. 6C, the groove 3B may be provided so as to gradually become narrower from the opening.
When the groove 3A is provided in this way, the thin portion 3A that remains without being penetrated will form burrs, so the thickness d and length l of the thin portion 3A that remains without being penetrated are twice as long as this portion. Assuming that burrs are formed by extending the thickness, it is preferable to form the burrs so as to be smaller than ½ of the amplitude width h of the surrounding shape 1A. In other words, since the thickness d of the thin wall portion 3A is preferably about half of the thickness of the plastic sheet, the amplitude width h is larger than 2 × d, further larger than 5 × d, and more particularly 10 It is more preferable to make it larger than xd. Furthermore, it is more preferable that the amplitude width h is larger than 2 × l and further larger than 5 × l.

The plastic sheet cutting line 1 described above is suitable for providing, for example, a plastic sheet for assembling 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 made 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.

The plastic sheet 50 shown in FIG. 7 is an example of a plastic sheet for assembling a packaging case in which the 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 via folding lines (ruled lines, etc.) 70, respectively, and side edges of the back plate portion 54 are provided. 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 so as to be recessed 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, in the upper surface plate portion 56, the position where the cutoff line 1 is provided is arbitrary as long as the portion where the fixing piece 64 is fixed and the other portion can be divided. 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. 8, the cut portion 67 is preferably formed by cutting in 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 appropriately so as not to have an angular portion.

Although the cut line 1 is not clearly shown in FIG. 8, the cut line 1 is a semicircular surrounding shape 1 </ b> A composed of the through-line 2, and has an opening 1 </ b> B composed of the non-penetrated part 3 in a part of the upper side or the lower side A plurality of surrounding shapes 1A, 1A,... Are sequentially arranged in the longitudinal direction of the cutoff line 1 while alternately reversing the adjacent surrounding shapes 1A in the vertical direction.
As shown in FIG. 6C, 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. 8, 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 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.

  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. 9, 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.

1 Cut line 2 Through line 3 Non-through part 3A Thin part 3B Groove part 4 Projection part
5 Belt-shaped part 50 Plastic sheet 51 Front plate part 52 Left side plate part 53 Right side plate part 54 Back plate part 55 Paste allowance 56 Top plate part 57 Bottom plate part 58, 59 Insertion piece 60, 61, 62, 63 Folding piece 64, 65 Fastening piece 67 Cutting part 70 Folding curve 71 Container body part 75 Packaging case

Claims (5)

A cut line for a plastic sheet provided in a plastic sheet, which is a through-line that penetrates in the sheet thickness direction when the sheet is viewed in plan, and leaves the upper side or the lower side on both sides of the central part. The surrounding shape having an opening made of a non-penetrating portion that does not penetrate in the sheet thickness direction is alternately reversed to the adjacent surrounding shape and the vertical direction, and the side edge of the adjacent surrounding shape in the opening portion. part is positioned, and a plastic sheet for cutoff line openings with a composed been downy parallel arrangement along the longitudinal line of the tear line.
  The cut line for a plastic sheet according to claim 1, wherein the cut line is curved as a whole when viewed in plan.   A plastic sheet comprising the plastic sheet cutting line according to claim 1.   A plastic sheet for assembling a packaging case, comprising the cut line for the plastic sheet according to claim 1 or 2 on an upper surface plate portion or a bottom surface plate portion of the packaging case. It is a packaging case provided with the cut line for the plastic sheet according to claim 1 or 2 on the top plate portion or the bottom plate portion, and the top plate portion or the bottom plate portion provided with the cut line is a container main body through a fixing piece. A packaging case having a structure fixed to a part.

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