JP2011148519A - Cutting line for plastic sheet, plastic sheet for forming packaging case which includes the cutting line, and packaging case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting line being provided for the plastic sheet such that a packaging case can easily be opened to remain tamper-evident clearly, and further more, the cutting line makes a hand less likely to touch burr during or after cutting the plastic sheet. <P>SOLUTION: The cutting line for the plastic sheet is formed from a single line that includes: a mountain portion 2A and a valley portion 2B alternately repeated via an intermediate portion 2C between them, when the plastic sheet is viewed from above; and a through-cut line 2, formed through the plastic sheet in the direction of the thickness of the sheet. In addition, all the intermediate portions 2C or some intermediate portions 2C at a fixed interval are provided with non-penetration portions 3 which do not penetrate the sheet in a direction of its thickness. <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).

  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 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 problems, the present invention is a plastic sheet cut line provided in a plastic sheet, and when the sheet is viewed in plan, the ridges and valleys are alternately repeated continuously through the middle part, and Provided with penetration lines that penetrate in the sheet thickness direction, and non-penetrating parts that do not penetrate in the sheet thickness direction in all the middle abdominal parts or in a part of the middle abbreviated at certain intervals. The present invention proposes a plastic sheet cutting line having a configuration, and further having a bulging portion having a portion swelled in the thickness direction in a region within an amplitude sandwiched between a peak portion and a valley portion.
At this time, if the bulging portion has a portion that swells in the thickness direction in the amplitude inner region sandwiched between the peaks and valleys, the entire bulging portion exists in the amplitude inner region. Alternatively, a part of the bulging portion may be present in the region within the amplitude and not entirely present.

  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, by providing a non-penetrating part in the middle part between the peaks and valleys, burrs are generated in the middle part where hands and fingers are difficult to touch. In addition, since the bulging portion is obstructive, the possibility that the hand touches the burr can be further reduced.

It is the top view which showed an example of the tear line which concerns on this invention. It is the figure which showed an example of the cutting line which concerns on this invention, (A) is the top view, (B) is the BB sectional drawing. 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 the top view which showed the modification of the cut line of (B)-(D) shown in FIG. 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. 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 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 an example of the planar view shape of the bulging part of the cutoff line which concerns on this invention. It is the figure which showed the other example of the bulging part of the tear line which concerns on this invention, (A) is the top view, (B) is the BB sectional drawing. It is the figure which showed the further another example of the bulging part of the cutoff line which concerns on this invention, (A) is the top view, (B) is the BB sectional drawing. It is the figure which showed the further another example of the bulging part of the cutoff line which concerns on this invention, (A) is the top view, (B) is the BB sectional drawing. It is sectional drawing which showed the other example of the bulging part of the tear line concerning this invention. It is the figure which showed a mode that the burr | flash generate | occur | produces when cut | disconnecting a plastic sheet along a cutting line, and the state of the bulging part of the vicinity, (A) is a top view, (B) shows a part of the side to cut off (C) is a cross-sectional view showing a part of the uncut side. It is the top view which showed the other example of the tear line which concerns on this invention. 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 case assembly of FIG. FIG. 20 is a top perspective view showing an opened state of the packaging case of FIG. 19. It is the top view which showed the unfolded state of the plastic sheet for case assembly different from FIG. 18 which formed an example of the cut line which concerns on the other example of this invention. 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 plastic sheet of the present invention is a cut line provided in a plastic sheet as shown in FIG. 1-3, and when the sheet is viewed in plan, the peak part 2A and the valley part 2B are connected to the middle part 2C. Through each of the middle abdominal portions 2C, or in a part of the middle abdominal portions 2C with a certain interval, A non-penetrating portion 3 that does not penetrate in the sheet thickness direction is provided, and a bulging portion 4 (4A, 4B) having a portion that swells in the thickness direction is provided in an amplitude inner region sandwiched between the peak portion 2A and the valley portion 2B. It is a tear line provided with the composition provided.

  In the cut line 1, as shown in FIG. 4, the peak part 2A shows a concave part on the side to be cut off when cut by the cut line 1, the trough part 2B shows a concave part on the side that is left uncut, and the middle part 2C is , Between the peaks 2A and valleys 2B.

As shown in FIG. 5 (A), the shape of the cut line 1 in plan view may be a wavy shape in which rounded and curved peaks 2A and valleys 2B are alternately repeated, or FIG. As shown in FIG. 5B, the shape may be such that triangular peaks 2A and valleys 2B are alternately repeated, or trapezoidal peaks as shown in FIG. 2A and valleys 2B may be alternately repeated, or as shown in FIG. 5D, rectangular peaks 2A and valleys 2B are alternately repeated. It may be.
More preferably, when the plastic sheet is cut along the cut line 1, it is preferably formed so that the squared portion is rounded so as not to occur as much as possible after the cut. For example, in the case shown in FIGS. 5B to 5D, it is preferable to form the corners so as to be rounded as shown in FIGS. 6A to 6C, respectively.
Among these, in the case of a plastic sheet, as shown in FIG. 5 (A), it is possible to easily open 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.

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 ½ as shown in FIG. Instead, it is preferably formed to be 1/2 or more, particularly 1 or more as shown in FIG. 7B, for example.

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. 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. 9A, 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 cutting 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. 10A to 10C, 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. 10 (A), groove portions 3B may be provided on both upper and lower sides of the sheet surface, and a thin portion 3A may be left in the middle, or as shown in FIG. 10 (B), You may provide the groove part 3B in the up-down one side. At this time, as shown in FIG. 10C, 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.

  Further, since the thin portion 3A that remains without being penetrated (including the case where the sheet remains as it is) forms a burr, the thickness d and length l of the thin portion 3A that remains without being penetrated are determined by this portion. Is formed so as to be smaller than ½ of the amplitude width h of the peak portion 2A and the valley portion 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 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 the fingers and the like. Therefore, for example, in a cross section connecting adjacent non-penetrating portions 3, it is preferable to provide a bulging portion 4 bulging in the sheet thickness direction beside each non-penetrating portion 3.

  If the bulging portion 4 has a portion that swells in the thickness direction in an amplitude inner region sandwiched between the peak portion 2A and the valley portion 2B, for example, as shown in FIG. 2, FIG. 11, FIG. As shown in FIG. 13, the entire bulging portion may be present in the region within the amplitude, or as shown in FIG. May not exist in the region within the amplitude.

  Here, the bulging portion 4 shown in FIGS. 1 and 2 is surrounded by the adjacent peak portions 2A and 2A, and is adjacent to the in-amplitude region sandwiched between the peak portion 2A and the valley portion 2B. One bulging portion 4 having a contour along the cutoff line 2 is provided in each of the amplitude inner regions surrounded by the valley portions 2B and 2B and sandwiched between the peak portion 2A and the valley portion 2B. When the sheet is viewed in plan, the bulging direction of the bulging part 4A provided on the side to be cut off when the sheet is cut along the cutoff line 2 is opposite to the bulging direction of the bulging part 4B provided on the uncut side. It is provided.

  The bulging part 4 shown in FIG. 11 has a shape different from that of FIG. 1, is long in the line direction connecting adjacent non-penetrating parts 3, 3, and both ends thereof are non-penetrating parts 3. It is formed in a belt shape that extends to the side of.

  The bulging part 4 shown in FIG. 12 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 parts 2B and 2B. Two bulging portions 4 are respectively provided beside each non-penetrating portion 3 in the amplitude-inner region surrounded by the peak portion 2A and the valley portion 2B.

  The entire bulging portion 4 shown in FIG. 13 has a strip shape along the continuous direction of the cutoff line 1, and is one bulge provided on the side to be cut off when the sheet is cut along the cutoff line 2 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 a contour along the cutoff line 2 on the side of the cutoff line 2.

  Moreover, as shown in FIG.2, FIG.11, FIG.13, you may make it provide the one bulging part 4 between the adjacent peak parts 2A and the peak parts 2A, and also as shown in FIG. Two or more may be provided. At this time, as shown in FIG. 12, it is provided on both sides of the non-penetrating portion 3, that is, on both sides of one side (the side to be cut off) and the other side (the side to be left uncut) when the cut line 2 is cut. May be.

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.
For example, as shown in FIG. 14, it may be formed in a strip shape that is long in the direction of a line connecting adjacent non-penetrating portions 3, 3, and so that both ends extend to the side of each non-penetrating portion 3. Good.

For example, as shown in FIG. 15, the bulging direction of the bulging portion 4 may be formed so that all the bulging portions 4 bulge to one side. For example, as shown in FIG. When cutting, the side to be separated is pulled upward (before the plane of the paper), as shown in FIG. 16B, the non-penetrating portion 3 on the side to be separated is directed toward the uncut portion, that is, downward. Since the burr 5 extends on the back side of the paper, the bulging portion 4 on the side to be separated is preferably formed so as to bulge downward (the back side of the paper), and conversely, the non-penetrating portion 3 on the side to be left uncut. As shown in FIG. 16C, since the burr 5 extends toward the side to be cut, that is, upward (front side of the paper), the bulging portion 4 on the side to be left uncut is upward (front side of the paper). It is preferable to form so as to swell.
Thus, when the sheet 1 is viewed in plan, the bulging direction of the bulging portion 4 provided on the side to be cut off when the sheet 1 is cut along the cutoff line 2 and the bulging direction of the bulging portion 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 × d.

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. At this time, since the belt-like portion 6 sandwiched between the two cut lines 1 and 1 is separated so as to be pulled upward (before the paper surface), burrs are also generated upward (before the paper surface). 4 is preferably formed so as to bulge upward (before the paper surface).
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 6 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.

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. 18 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 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. 19, the position where the cutoff 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. 22, 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 inside of the width as appropriate so as not to have an angular portion.
Further, as shown in FIG. 22, in the plurality of middle abdominal portions 2C of the cut line 1 provided on the upper surface plate portion 56, when expressed as 2C1, 2C2, 2C3. In order to prevent the finger from touching the burr, the non-penetrating part 3 is not provided in the outermost middle part 2C1, but the non-penetrating part 3 is provided from the next middle part 2C2 to the inner 2C3. preferable.

Although the cut line 1 is not clearly shown in FIG. 18, the round and curved peaks 2A and valleys 2B are alternately and continuously arranged via the middle abdomen 2C, and all the middles 2C The non-penetrating part 3 is provided in the middle part, in other words, the middle part of the amplitude width h. In addition, a swollen portion 4 (4A, 4B) having a swollen portion in the thickness direction is provided in the amplitude inner region sandwiched between the peak portion 2A and the valley portion 2B, and the side to be cut off when cut by the cut line 2 The bulging direction of the bulging part 4A provided on the side and the bulging direction of the bulging part 4B provided on the uncut side are provided in opposite directions.
As shown in FIG. 10C, the non-penetrating portion 3 is formed by providing a groove 3B that gradually narrows from the opening on one surface of the sheet, and the depth of the groove 3B is 1 / th 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. 19, the front plate portion 51, the left and right side plate portions 52, 53 and the back plate portion 54 are each bent along 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. 20, the top 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. 21 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. 21, the plastic sheet 80 is provided with not only the top plate portion 56 but also the bottom plate portion 57 with the 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.

Two cut lines 1 and 1 are provided in parallel at a predetermined interval on the upper plate 56 so that the band-like part 6 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 Mid-abdominal part 3 Non-through part 3A Thin part 3B Groove part 4 Bump part 5 Protrusion part ("burr")
6 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 72 Bottom surface 73 Upper surface 75 Packaging case

Claims (6)

  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 the middle part and penetrated in the sheet thickness direction. And a configuration in which a non-penetrating portion that does not penetrate in the sheet thickness direction is provided in each middle abdominal portion or in a part of the middle abdominal portion with a certain interval. A cut line for a plastic sheet provided with a bulging portion having a portion swelled in a thickness direction in a region within an amplitude sandwiched between valley portions.   The cut line for a plastic sheet according to claim 1, further comprising a bulging portion bulging in the sheet thickness direction beside each non-penetrating portion in a cross section connecting adjacent non-penetrating portions.   When the sheet is viewed in plan, the bulging direction of the bulging part provided on the side to be cut off when the sheet is cut along the cutting line is opposite to the bulging direction of the bulging part provided on the uncut side. The cutoff line for plastic sheets according to claim 1 or 2.   The plastic sheet provided with the cutoff line for plastic sheets as described in any one of Claims 1-3.   A plastic sheet for forming a packaging case, comprising the cut line for a plastic sheet according to any one of claims 1 to 3. The packaging case provided with the cutoff line for plastic sheets as described in any one of Claims 1-3.

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