JP2010228811A - Cutting line for plastic sheet, and plastic sheet and packaging case having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting line for a plastic sheet in which the plastic sheet can be easily opened, the opening of the plastic sheet can clearly be checked, and the possibility that a hand makes contact with burrs when the plastic sheet is separated or thereafter can be reduced. <P>SOLUTION: The cutting line for the plastic sheet is formed of one line. In a plan view of the plastic sheet, a ridge part 2A and a valley part 2B are alternately repeated via an intermediate middle part 2C, and a through line 2 penetrating the sheet in the sheet thickness direction is formed. A non-through part 3 which does not penetrate the sheet in the sheet thickness direction is formed in each intermediate middle part 2C or in a part of the intermediate middle parts 2C at predetermined spaced intervals. <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 from polyethylene terephthalate (PET), polypropylene (PP), especially 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).

  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 is composed 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 plastic sheet cut line provided in a plastic sheet, and when the sheet is viewed in plan, the crests and troughs are alternately repeated through the middle part, and the sheet thickness A structure in which a through-line that penetrates in the direction is provided and a non-penetrating part that does not penetrate in the sheet thickness direction is provided in each middle part or in a part of the middle part with a certain interval. Proposed cutting line for plastic sheet consisting of a single line (excluding a cutting line consisting of two parallel lines).

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, by providing a non-penetrating part in the middle part between the mountain parts, burrs are generated in the middle part where hands and fingers are difficult to touch. The sex can be reduced.
Furthermore, since the cutting line is constituted by a single line, it is preferable in that dust is not generated like a cutting line composed of two parallel lines.

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. It is the top view which illustrated the planar view shape of the tear line concerning the present invention. 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 the reference example of the cutoff line which concerns on this invention. It is a figure for demonstrating the position which provides a non-penetrating part in the cutoff line which concerns on this invention, (A) is the top view which showed an example of the cutoff line which concerns on this invention, (B) is the cutting | disconnection of it It is the top view which showed the latter state. 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. 10 is a top perspective view showing a packaging case in which the case assembling plastic sheet of FIG. 9 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 the unfolded state of the plastic sheet for case assembly different from FIG. 9 which formed an example of the cut line which concerns on the reference example of this invention. It is the top view which showed the modification of the cutoff line of (B)-(D) shown in FIG. It is the top view which showed the modification of the tear line which concerns on one Example of this invention. It is the figure which showed the modification of the cutoff line which concerns on one Example of this invention, (A) is an example whose ratio (h / H) of pitch H and amplitude width h is less than 1/2, B) is a plan view showing an example in which (h / H) is 1 or more. 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 plastic sheet cutting line 1 according to the present invention is a cutting line provided in a plastic sheet as shown in FIG. 1-2. When the sheet is viewed in plan, the peak part 2A and the valley part 2B are interposed through the middle part 2C. In addition, the sheet is provided with through-lines 2 that are alternately repeated continuously and penetrate in the sheet thickness direction, and in each of the middle parts 2C or in a part of the middle parts 2C with a certain interval. It is a cutoff line provided with the structure which provides the non-penetrating part 3 which does not penetrate in the thickness direction.

  In this cut line 1, as shown in FIG. 3, the peak portion 2A indicates a concave portion on the side to be cut when cut by the cut line 1, the trough portion 2B indicates a concave portion on the side that is left uncut, and the middle portion 2C is , Between the tops of the peak 2A and the valley 2B.

As shown in FIG. 4 (A), the shape of the cut line 1 in plan view may be a wavy shape formed by alternately repeating round and curved peaks 2A and valleys 2B, or FIG. As shown in FIG. 4B, the shape may be such that triangular peaks 2A and valleys 2B are alternately repeated, and trapezoidal peaks as shown in FIG. 2A and valleys 2B may be alternately repeated, or as shown in FIG. 4D, rectangular peaks 2A and valleys 2B are alternately repeated. It may be.
In addition, about the form shown to FIG.4 (B)-(D), when cut | disconnecting a plastic sheet along the cutting line 1, it is each FIG. As shown in (C), it is preferable to form the corners so that they are rounded.
Among these, in the case of a plastic sheet, as shown in FIG. 4A, from the viewpoint that it can be easily opened when it is desired to open, and it is difficult to generate burrs when separated, as shown in FIG. A shape having a wavy shape in which the portions 2B are alternately repeated is preferable. At this time, the ridges 2A and valleys 2B made of circular arcs or elliptical arcs may be wave-like shapes that are alternately repeated via the non-penetrating parts 3, but the non-penetrating parts can be separated more smoothly. For example, it is more preferable to form a sine curve so that the entire cutting line 1 including 3 has a smooth wavy shape.

Further, for example, as shown in FIGS. 14 (A) and 14 (B), the cutoff line 1 has a shape in which a narrow opening 6A and a wide depth 6B are provided vertically when viewed in plan. May be formed in series in the longitudinal direction of the cutoff line 1 while alternately reversing. At this time, the contour line of each depth part 6B constitutes the peak part 2A or the valley part 2B.
In FIG. 14A, a shape like a ridge having a narrow opening 6A and a wide depth 6B at the top and bottom is formed in series in the longitudinal direction of the cut line 1 while the direction of the top and bottom is alternately reversed. FIG. 14B shows a shape of a conical flask having a narrow opening 6A and a wide depth 6B at the top and bottom, while the longitudinal direction of the cutoff line 1 is reversed while the top and bottom directions are alternately reversed. It is formed in series in the direction.
In the case of the cut line 1 having such a shape, if the opening width of the narrow opening 6A is set to a width where the flesh of a finger is difficult to enter, a burr is generated at the back, and thus the finger does not touch the burr more reliably. Can be. In addition, since each container-like shape is engaged with each other in the horizontal direction, that is, the paper surface direction when viewing the figure, it does not detach 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 between the adjacent peak portions 2A and 2A or the adjacent valley portions 2B and 2B 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 or between the valley portions 2B and 2B. Can be prevented.
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 of the peak portion 2A and the valley portion 2B 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.

  Further, the ratio (h / H) between the distance (pitch) H between the adjacent peak portions 2A and 2A or between the adjacent valley portions 2B and 2B and the amplitude width h of the peak portions 2A and valley portions 2B is determined by each middle portion. From the viewpoint of effectively preventing the finger from touching the burr assuming that the non-penetrating part 3 is provided in the middle of 2C, it is formed to be less than 1/2 as shown in FIG. Instead, it is preferably formed so as to be 1/2 or more, especially 1 or more as shown in FIG.

In order to prevent the plastic sheet from being bent along the cutoff line 1 when sealing the box, 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. 6, the cut line 1 is not a cut line in which the two cut lines 1 and 1 are arranged in parallel at a predetermined interval, but constitutes a cut line by itself. 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.

As shown in FIG. 1-3, the non-penetrating portions 3 may be provided in all of the middle abdominal portions 2C, or in a part of the middle abdominal portions 2C with a certain interval, for example, each middle abdominal portion. You may provide in 2C.
Further, it may be provided at one place in each middle abdominal part 2C, or may be provided at two or more places. However, considering the ease of opening, it is provided at one place or two places in each middle abdominal part 2C. preferable.

  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.

As shown in FIG. 7A, the non-penetrating portion 3 is preferably provided at a position of 3/4 of the amplitude width h as viewed from the valley portion 2B or a position on the near side thereof. When the plastic sheet is cut along the cut line 1, the non-penetrating portion 3 becomes a sharp protrusion ("burr") 4 as shown in FIG. By providing 3, it is possible to further prevent the burr 4 from touching the hand (including the finger).
From this point of view, it is more preferable that the non-penetrating portion 3 is provided at a position that is 2/3 of the amplitude width h as viewed from the valley portion 2B or a position on the near side thereof. More preferably, it is provided at a half position or a position on the near side.

The non-penetrating part 3 can be left as it is in the thickness of the sheet. However, as shown in FIGS. 8A to 8C, a groove part 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. 8 (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. 8C, 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 this, it is preferable to form it so as to be smaller than ½ of the amplitude width h of the peak 2A and valley 2B. In other words, since the thickness d of the thin portion 3A is preferably about half of the thickness of the plastic sheet, the amplitude width h of the peak portion 2A and the valley portion 2B is larger than 2 × d, and further 5 × It is more preferably larger than d, more preferably larger than 10 × d. Furthermore, it is more preferable that the amplitude width h of the peak portion 2A and the valley portion 2B 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 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. 9 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 via 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, respectively. 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 of the upper and lower edges via a folding line 70, and the cut line 1 is provided in the upper surface plate portion 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, as shown in FIG. 10, the position where the cut line 1 is provided is arbitrary as long as the portion where the fixing piece 65 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.
Further, as shown in FIG. 16, the more of the abdomen 2C tear line 1 provided in the upper plate portion 56, sequentially 2C ₁ from the left and right side edge portions toward the inside, 2C _2, 2C ₃ when expressed as ... In order to further prevent the finger from touching the burr, the outermost middle part 2C ₁ is not provided with the non-penetrating part 3, and the next middle part 2C ₂ is not penetrated to the inner 2C _3. It is preferable to provide the part 3.

Although the cut line 1 is not clearly shown in FIG. 9, the crests 2A and the valleys 2B that are rounded and curved are alternately and continuously arranged via the middle abdomen 2C, and all of the middle abdomen 2C The non-penetrating part 3 is provided in the middle part, in other words, the middle part of the amplitude width h.
As shown in FIG. 8C, 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. 10, 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. 11, 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. 12 shows a plastic sheet 80 as a reference 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 front end 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 3 Non-through part 3A Thin part 3B Groove part 4 Protrusion part ("burr")
5 Strip 6A Opening 6B Depth 50 Plastic Sheet 51 Front Plate 52 Left Side Plate 53 Right Side Plate 54 Back Plate 55 Glue 56 Top Plate 57 Bottom Plate 58, 59 Insert Pieces 60, 61, 62, 63 Folding pieces 64, 65 Adhering pieces 67 Cutting part 70 Folding curve 71 Container body part 72 Bottom surface 73 Upper surface 75 Packaging case

Claims (3)

  A cut line for a plastic sheet provided in a plastic sheet, and when the sheet is viewed in plan, a crest and a trough are alternately repeated through a middle part and provided with a through-line penetrating in the sheet thickness direction. In addition, a plastic composed of a single line, with a configuration in which a non-penetrating part that does not penetrate in the sheet thickness direction is provided in each middle part or in a part of the middle part at a certain interval. Sheet cut line (excluding cut line consisting of two parallel lines).   The cut-through line for a plastic sheet according to claim 1, wherein the through-line is entirely curved when viewed in plan. A plastic sheet provided with the cut line for a plastic sheet according to claim 1 or 2.

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