JP4908564B2 - Bending ruled plastic sheet and ruled line blade for plastic sheet - Google Patents

Description

  The present invention is used when, for example, a plastic sheet with a folded ruled line used when assembling a packaging container that accommodates articles such as cosmetics, stationery, toys, and foods, and when a folded ruled line is attached to a folded part of the plastic sheet. The present invention relates to a ruled blade for a plastic sheet.

  Conventionally, as a plastic sheet provided with the above-described bent ruled line, for example, as shown in FIGS. 14 and 15, a concave blade part 10a and a convex blade part 10b are pressed against the ruled line blade 10 formed on the top surface of the blade edge. A plastic sheet 11 with a bent ruled line (Patent Document 1) in which a bent ruled line 12 composed of a shallow groove part 12a and a deep groove part 12b is formed at the bent part, and as shown in FIGS. A circular concave blade portion 13a and a substantially straight convex blade portion 13b press the ruled line blade 13 formed on the top surface portion of the blade tip, and a substantially semicircular shallow groove portion 15a as viewed from the side, and a substantially straight shape. There is a plastic sheet 14 with a bent ruled line (Patent Document 2) in which a bent ruled line 15 formed of a deep groove 15b is formed at a bent part.

No. 4-9346 JP 2001-293777 A

  However, when the bottom wall thickness of the deep groove portions 12b and 15b formed by the ruled line blades 10 and 13 is reduced, the bending characteristics of the plastic sheets 11 and 14 are improved. Since it is continuous, when the plastic sheets 11 and 14 are bent, for example, tears or large holes are likely to occur at the bottom of the deep grooves 12b and 15b, and foreign matter such as dust and water drops may intrude, for example. The merchandise value and hygiene level of the articles stored in the container are impaired. Further, since the corners of the shallow groove portions 12a are acute, and the distance between the shallow groove portions 15a is wide, the feel of the bent portion is poor, and even if the cloth or skin contacts, it may be caught.

  On the other hand, when the ruled line blades 10 and 13 are deeply bitten in order to reduce the bottom wall thickness of the deep grooves 12b and 15b, the plastic sheets 11 and 14 are spread out with respect to the surface direction, and the bent portions are warped and wavy. Etc. occur, and the appearance looks worse. In addition, when the plastic sheets 11 and 14 are assembled into a container form by a box making machine, the plastic sheets 11 and 14 are stagnant or clogged, and therefore it is difficult to perform the assembly work mechanically.

  In view of the above problems, the present invention provides a good folding property and flexibility by attaching a folding ruled line in which a plurality of deep groove portions are formed on the bottom surface portion between each shallow groove portion to warp, corrugate, and the like. An object of the present invention is to provide a plastic sheet with a folded ruled line and a ruled line blade for the plastic sheet that can suppress the occurrence and mechanically perform the folding operation.

  The present invention is a plastic sheet provided with a concave bent ruled line consisting of a pair of side surfaces inclined at a predetermined angle and facing each other, and a narrow bottom surface continuous with one end side of the side surfaces, A shallow groove portion is formed at a predetermined interval with respect to the longitudinal direction along the bottom surface portion of the bent ruled line, and a groove portion deeper than the shallow groove portion is formed along the bottom surface portion between the shallow groove portions with respect to the longitudinal direction. And a plurality of bent ruled plastic sheets.

  According to the present invention, the bending ruled line in which a plurality of deep groove portions are formed between the shallow groove portions is attached to the plastic sheet, so that the stress in the surface direction applied to the plastic sheet is less than the continuous thin portion. Therefore, it is possible to suppress the occurrence of warping, undulations, etc., and mechanically perform the work of bending the plastic sheet and assembling it into a container form. In addition, the pressurizing force when attaching the bent ruled line to the plastic sheet is small, and the workability is improved.

  In addition, since a plurality of deep groove portions are formed between the shallow groove portions with a small wall thickness, the portions having a high molecular density are dispersed, and good folding characteristics and flexibility can be obtained. No large holes or the like are generated, and even if the holes are generated, since the diameter is small and the foreign matter is difficult to enter, it is possible to prevent the commercial value and sanitary level from being impaired.

The expanded view which shows the plastic sheet with a bending ruled line. The perspective view which shows the state which assembled the plastic sheet in the container form. The perspective view which shows the bending ruled line formed in the plastic sheet. The longitudinal side view which shows the groove shape of a bending ruled line. The longitudinal section front view which shows the groove shape of a bending ruled line. The longitudinal side view which shows the other groove shape of a bending ruled line. The longitudinal section side view which shows the other groove shape of a bending ruled line. The perspective view which shows the ruled line blade which attaches a bending ruled line. The side view which shows the blade part shape of a ruled line blade. The longitudinal section which shows the blade part shape of a ruled line blade. The side view which shows the other blade shape of the ruled line blade for plastic sheets. The side view which shows the other blade shape of the ruled line blade for plastic sheets. The top view which shows the other groove shape of a bending ruled line. The perspective view which shows the ruled line blade which attaches the bending ruled line of a prior art example. The perspective view which shows the bending ruled line provided by the ruled line blade of FIG. The perspective view which shows the ruled line blade which attaches the bending ruled line of a prior art example. The perspective view which shows the bending ruled line attached by the ruled line blade of FIG.

  The above-mentioned plastic sheet is formed of a single or composite plastic such as polypropylene (PP), polyethylene terephthalate (PET), biodegradable plastic, and the like, and has a predetermined range of about 0.1 mm to about 1 mm, for example. A transparent or translucent sheet having a thickness is used.

  As an embodiment of the present invention, each of the deep groove portions is formed to have a different depth, or a substantially intermediate groove portion deeper than the shallow groove portion and shallower than the deep groove portion is formed on the bottom surface portion between the shallow groove portions. Can do.

  On the other hand, each shallow blade part of the plastic sheet ruled line blade having a shape substantially corresponding to the bent ruled line described above is set to a different biting amount, or the biting amount at the top surface part between the shallow blade parts is smaller than the shallow blade part. However, it is possible to form a substantially medium-sized blade portion that is deep and has a smaller amount of biting than the deep blade portion. Further, the deep groove portion and the deep blade portion can be set to dimensions that are deeper by a predetermined ratio with respect to the shallow groove portion and the shallow blade portion. That is, when the depth E1 of the shallow groove and the height E2 of the shallow blade are about 100%, for example, the depth F1 of the deep groove and the height F2 of the deep blade are about 30% to about 70%, for example. Set to a depth of about.

  The shallow groove and the shallow blade constituting the ruled blade for plastic sheet used for attaching the folded ruled line, and the shallow groove and deep groove A1, B1, B1a, C1, D1, E1, F1, G1 constituting the bent ruled line described above A2, B2, B2a, C2, D2, E2, F2, and G2 of the portion and the deep blade portion can be set to the following dimensions.

  That is, the pitch interval A1 of the shallow groove portion and the pitch interval A2 of the shallow blade portion are set to an interval (for example, approximately 1.1 mm) included in a range of approximately 0.3 mm to approximately 10.0 mm, for example, and the pitch interval of the deep groove portion is set. The pitch interval B2 between the shallow groove portion and the deep groove portion is set to, for example, an interval included in the range of approximately 0.05 mm to approximately 1.0 mm (for example, approximately 0.2 mm). And the pitch interval B2a between the shallow blade portion and the deep blade portion is set to be narrower than the pitch intervals A1 and A2 and wider than the pitch intervals B1 and B2 (for example, approximately 0.25 mm), and the width of the shallow groove portion C1 and the width C2 of the shallow blade portion are set, for example, to a width included in a range of approximately 0.2 mm to approximately 1.0 mm, and the width D1 of the deep groove portion and the width D2 of the deep blade portion are, for example, approximately 0.01 mm to In the range of about 1.0mm The width is set to a depth, and the depth E1 of the shallow groove and the height E2 of the shallow blade are set to a value included in a range of about 0.07 mm to about 0.25 mm (for example, about 0.13 mm), for example. The depth F1 of the deep groove portion and the height F2 of the deep blade portion are set to numerical values (for example, approximately 0.05 mm) included in a range of approximately 0.01 mm to approximately 0.1 mm, for example.

  In addition, the width G1 of the bottom surface portion of the folded ruled line and the width G2 of the top surface portion of the ruled line blade are set to predetermined widths, for example, in a range of about 0 mm to about 0.15 mm, and the angle θ1 of the folded ruled line and the ruled line blade The biting angle θ2 is, for example, an angle included in a range of approximately 15 to 110 degrees, that is, a folding ruled line formed at a bent portion of the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, and the joint portion 1d. The angle θ1 and the biting angle θ2 of the ruled line blade are set to about 43 degrees, and the angle θ1 of the bent ruled line and the biting angle θ2 of the ruled line blade formed at the bent portion of the folded portion 1e and the upper surface portion 1f and the lower surface portion 1g are set. Set to approximately 75 degrees. In addition, the thickness H of the ruled line blade is set to a predetermined thickness included in a range of approximately 0.5 mm to approximately 2.0 mm.

  If the pitch interval A2 of the shallow blade portion and the pitch interval B2 of the deep blade portion are larger than the set values, the strength of the deep blade portion is lowered, and the folding characteristics of the plastic sheet are deteriorated. Further, if the pitch intervals A2 and B2 are smaller than the set value, the strength of the blade edge is lowered, and a sufficient effect for attaching the folding ruled line 2 cannot be obtained. Therefore, the numerical value included in the above range is set. Is preferred.

  Moreover, when the widths C2, D2 and the heights E2, F2 are larger than the set values, the feel and folding characteristics of the folded ruled lines 2 attached to the plastic sheet are deteriorated. Further, if the widths C2, D2 and the heights E2, F2 are smaller than the set values, the strength of the cutting edge is lowered, and a sufficient effect for attaching the bent ruled line 2 cannot be obtained. It is preferable to set a numerical value.

  In addition, when the biting angle θ2 of the ruled line blade is increased, a large pressing force is required when attaching the bent ruled line, and processing is difficult. The plastic sheet is warped or wavy, making it difficult to bend mechanically. The folding characteristic of the plastic sheet is deteriorated. Further, if the angle θ2 and the width G2 are made smaller than the set values, the strength of the cutting edge is lowered and the life is shortened, so it is preferable to set the values within the above range.

  In addition, the shallow groove portion and the deep groove portion of the bent ruled line and the shallow blade portion and the deep blade portion of the ruled line blade, for example, a substantially semicircular shape, a substantially arc shape, a substantially trapezoidal shape, a substantially square shape having a smooth curved surface when viewed from the side surface. It can be formed into a specific cross-sectional shape such as a shape, a substantially triangular shape, or a groove shape formed by combining a plurality of shapes.

  An embodiment of the present invention will be described in detail with reference to the drawings. The drawing shows a folded ruled plastic sheet used when assembling a packaging container in which an article is accommodated. In FIG. 1, this plastic sheet 1 is made of, for example, approximately 0 by polypropylene (PP) or polyethylene terephthalate (PET). .It is composed of a transparent or translucent sheet formed to a thickness of about 1 mm to about 1 mm, and is viewed from the front when the sheet is punched into a packaging container (see FIG. 2) or after being punched. Left and right side surface portions 1b connected to both side edges of the front surface portion 1a having a substantially rectangular shape, a rear surface portion 1c connected to the right side edge portion of one side surface portion 1b, and a right side edge portion of the rear surface portion 1c. A joining portion 1d, a folded portion 1e provided continuously with the upper and lower edges of the side surface portion 1b, an upper surface portion 1f provided continuously with the upper edge portion of the front surface portion 1a, a lower surface portion 1g provided continuously with the lower edge portion, and an upper surface Part 1f and The folding portion between the folding portion 1h which is provided continuously to the surface portion 1g, to form a concave bent border 2 by ruled blade 6 to be described later. And the hole 1j for suspending the plastic sheet 1 assembled in the container form is opened to the support part 1i provided continuously with the upper edge part of the rear surface part 1c.

  That is, when assembling into a substantially rectangular container shape when viewed from the side surface shown in FIG. 2, the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, the joining portion 1d, the folding portion 1e,. The part 1g is bent in a predetermined direction and angle along the folding ruled line 2, the joint part 1d provided continuously with one side part and the other side part 1b are bonded and fixed with an adhesive, and the folded part on the lower edge side 1e, the upper surface portion 1f, and the lower surface portion 1g are folded inward and closed.

  Further, when the article is accommodated, the folding portion 1e on the upper edge side, the upper surface portion 1f and the lower surface portion 1g are once bent outward to be opened and closed after the article is accommodated. ) And assembly work by an automatic storage machine (not shown) can be easily performed. Further, the joining portion 1d may be joined and fixed by, for example, welding or high-frequency welding.

  As shown in FIGS. 3, 4, and 5, the folding ruled line 2 attached to the bent portion of the plastic sheet 1 includes a pair of side surface portions 2 a that are inclined at a predetermined angle and face each other, and the side surface portions 2 a, 2 a, A groove portion 3 is formed in a substantially V shape by a bottom surface portion 2b continuous with one end side of 2a, and is shallow in a longitudinal direction along the bottom surface portion 2b of the folding ruled line 2 with a groove portion shallower than the maximum depth of the folding ruled line 2 by a predetermined ratio. On the other hand, a plurality of groove portions 4 that are deeper than the shallow groove portions 3 by a predetermined ratio are formed in the longitudinal direction along the bottom surface portion 2b between the shallow groove portions 3 and 3 (4 in the embodiment). ). And the thickness of the bottom face part 2b is formed in the predetermined | prescribed thickness included in the range of about 0.3 mm-about 0.08 mm, for example. Moreover, you may change the groove number of the deep groove part 4 to 4 or less, or 4 or more, for example.

  Further, the shallow groove portion 3 and the deep groove portion 4 are formed in a substantially semicircular shape or a substantially arc-shaped cross section having a smooth curved surface when viewed from the side, and the pitch interval A1 of the shallow groove portions 3 is approximately 1.1 mm. The pitch interval B1 of the deep groove portion 4 is set to about 0.2 mm, the pitch interval B1a between the shallow groove portion 3 and the deep groove portion 4 is set to about 0.25 mm, and the width of the shallow groove portion 3 is set. C1 is set to be wider than the deep groove 4, the width D1 of the deep groove 4 is set to be narrower than the shallow groove 3, and the depth E1 of the shallow groove 3 is set to about 0.13 mm. The depth F1 of the deep groove part 4 is set to about 0.05 mm.

  In addition, the width G1 of the bottom surface 2b of the bent ruled line 2 is set to a predetermined width included in a range of, for example, approximately 0 mm to approximately 0.15 mm, and the front surface 1a, the side surface 1b, the rear surface 1c, The angle θ1 of the folding ruled line 2 formed in the bent portion with the portion 1d is set to an angle (for example, approximately 43 degrees) at which bending is allowed with respect to a predetermined direction, and the folding portion 1e, the upper surface portion 1f, and the lower surface The angle θ1 of the folding ruled line 2 formed at the bent portion with the portion 1g is set to an angle (for example, approximately 75 degrees) at which bending is allowed with respect to the inner side and the outer side. A bent ruled line 2 corresponding to the material, thickness, strength, hardness and the like of the plastic sheet 1 is attached by a ruled line blade 6 which will be described later, or the bent ruled line 2 is attached to a shallow blade part 7 and a deep blade part 8 of the ruled line blade 6. Can be changed depending on the combination, depth, number of teeth, etc.

  In addition to the substantially semicircular shape and the substantially arc shape, for example, the shallow groove portion 3 and the deep groove portion 4 are formed into a specific cross-sectional shape such as a substantially trapezoidal shape, a substantially rectangular shape, or a substantially triangular shape, or a groove shape that is a combination of a plurality of them. It may be formed.

  FIG. 6 shows another cross-sectional shape of the folding ruled line 2, and between the shallow groove portions 3, 3, a substantially middle groove portion 5 that is deeper than the shallow groove portion 3 and shallower than the deep groove portion 4 is formed. One or a plurality of groove portions 4 and 5 are formed at substantially different intermediate depths, and the groove portions 4 and 5 are formed at different depths. In addition, since the folded ruled line 2 is attached to the bent portion of the plastic sheet 1 using the ruled line blade 6 (see FIG. 11) having a blade shape substantially corresponding to the groove shape, the operation and effect substantially the same as those of the above-described embodiment. Can be played. Further, the depth of the groove 5 can be changed to any depth as long as it is between the shallow groove 3 and the deep groove 4.

  FIG. 7 shows another cross-sectional shape of the folding ruled line 2, in which the shallow groove portion 3 is formed in a substantially trapezoidal shape when viewed from the side surface, and the deep groove portion 4 is formed in a substantially rectangular shape and a substantially triangular shape when viewed from the side surface. ing. Moreover, since the folded ruled line 2 is attached to the bent portion of the plastic sheet 1 using the ruled line blade 6 (see FIG. 12) having a blade shape substantially corresponding to the groove shape, the operation and effect substantially the same as those of the above-described embodiment. Can be played.

  On the other hand, the plastic sheet ruled line blade 6 used when the bent ruled line 2 is attached to the plastic sheet 1 is a pair of slanting at a predetermined angle and facing each other, as shown in FIGS. The side surface portion 6a and the narrow top surface portion 6b continuous with one end side of the side surface portions 6a and 6a are formed in a substantially V shape, and the blade portion 7 with a small bite amount is formed on the top surface portion 6b of the ruled line blade 6. The blade 8 is formed at a predetermined interval with respect to the longitudinal direction along the top surface 6b between the shallow blades 7 and 7, and has a deeper bite than the shallow blade 7 with respect to the longitudinal direction. A plurality are formed (four in the embodiment). Moreover, you may change the number of the blades of the deep blade part 8 to 4 sheets or less, or 4 sheets or more, for example.

  In addition, the shallow blade portion 7 and the deep blade portion 8 are processed into a substantially semicircular shape or a substantially arc-shaped cross-sectional shape having a smooth curved surface when viewed from the side by a cutting means such as a cylindrical file or a wire, and bite. The pitch interval A2 of the shallow blade portion 7 is set to approximately 1.1 mm, the pitch interval B2 of the deep blade portion 8 is set to approximately 0.2 mm, and the distance between the shallow blade portion 7 and the deep blade portion 8 is set. The pitch interval B2a is set to approximately 0.25 mm.

  And the width C2 of the shallow blade part 7 is set to a width wider than the deep blade part 8, the width D2 of the deep blade part 8 is set to a width narrower than the shallow blade part 7, and the height of the shallow blade part 7 is set. The length E2 is set to about 0.13 mm, and the height F2 of the deep blade portion 8 is set to about 0.05 mm.

  Further, the width G2 of the top surface portion 6b of the ruled line blade 6 is set to a predetermined width included in the range of about 0 mm to about 0.15 mm, and the thickness H of the ruled line blade 6 is set to about 0.5 mm to about 2.0 mm. Is set to a predetermined thickness included in the range, and the biting angle θ of the blade edge is set to approximately 43 degrees.

  In addition, for example, in addition to a substantially semicircular shape and a substantially arc shape, the shallow blade portion 7 and the deep blade portion 8 have a specific cross-sectional shape such as a substantially trapezoidal shape, a substantially rectangular shape, a substantially triangular shape, or a combination of a plurality of grooves. You may form in a shape.

  FIG. 11 shows another blade shape of the ruled line blade 6 for plastic sheet, and the amount of biting is deeper than the shallow blade portion 7 by a predetermined ratio between the shallow blade portions 7 and 7 and bites more than the deep blade portion 8. The bent ruled line 2 shown in FIG. 6 is formed into a plastic sheet by using the ruled line blade 6 on which the blade parts 8 and 9 having different biting amounts are formed. Since it is attached to the bent portion of 1, the operation and effect substantially equivalent to those of the above-described embodiment can be achieved. Further, the biting amount of the blade portion 9 can be changed to any biting amount as long as it is between the shallow blade portion 7 and the deep blade portion 8.

  FIG. 12 shows another blade shape of the ruled line blade 6 for plastic sheet, in which the shallow blade portion 7 is formed in a substantially trapezoidal shape when viewed from the side surface, and the deep blade portion 8 is formed in a substantially rectangular shape and a substantial shape when viewed from the side surface. Since the folding ruled line 2 shown in FIG. 7 is attached to the bent part of the plastic sheet 1 using the ruled line blade 6 formed in a triangular shape, it is possible to achieve substantially the same operations and effects as the above-described embodiment.

  FIG. 13 shows another groove shape of the folding ruled line 2 in which the shallow groove portions 3 and the deep groove portions 4... Are arranged so as to intersect at a predetermined angle with respect to the longitudinal direction, and the shallow blade intersecting at an angle substantially corresponding to the arrangement. Since the folded ruled line 2 is attached to the folded part of the plastic sheet 1 using the ruled line blade 6 (not shown) in which the part 7 and the deep blade part 8 are formed, the same operation and effect as the above-described embodiment are exhibited. be able to. Moreover, you may change the arrangement | sequence of the shallow groove part 3 and the deep groove part 4, and the shallow blade part 7 and the deep blade part 8 to an acute angle or an obtuse angle.

  As described above, since the bent ruled line 2 in which a plurality of deep groove portions 4 are formed between the shallow groove portions 3 and 3 is attached to the bent portion of the plastic sheet 1 using a predetermined number of the above-mentioned ruled line blades 6, the wall thickness is thin. The stress in the surface direction applied to the plastic sheet 1 is smaller than that of continuous parts, and it is possible to suppress the occurrence of warping, undulation, etc., and the operation of bending the plastic sheet 1 and assembling it into a container form Can be done mechanically, saving labor and improving efficiency. In addition, the pressure applied when the folding ruled line 2 is attached to the plastic sheet 1 is small, and the workability is improved.

  In addition, since the thick and shallow groove portions 3 are formed at a predetermined interval, the strength necessary for bending is maintained, and the plastic sheet 1 can be prevented from tearing along the folding ruled line 2. In addition, since a plurality of the deep groove portions 4 are formed between the shallow groove portions 3 and 3 with a small thickness, the portions having a high molecular density are dispersed, and good folding characteristics and flexibility can be obtained, and the plastic sheet 1 is formed at an acute angle. Even if it is bent, no cracks or large holes are generated, and even if the holes are generated, the diameter is small and the foreign matter is difficult to enter, so that the commercial value and sanitary level can be prevented from being impaired.

  And since the shallow groove part 3 and the deep groove part 4 are formed in a smooth curved surface, the touch feeling is good, the cloth or the skin does not get caught even if it touches, the appearance of the folded part is beautiful, and is not noticeable. Excellent in design.

  The present invention is not limited to the configuration of the above-described embodiment.

  For example, a plurality of the bent ruled lines 2 may be formed parallel to the bent portion of the plastic sheet 1.

  Further, the folding ruled line 2 may be attached to a plastic sheet constituting various containers such as a pillow type packaging container or a substantially triangular shape or a substantially elliptical shape, and is used only for the plastic sheet assembled in the container form of the embodiment. Is not limited.

DESCRIPTION OF SYMBOLS 1 ... Plastic sheet 2 ... Bending ruled line 2b ... Bottom part 3 ... Shallow groove part 4 ... Deep groove part 5 ... Groove part 6 ... Ruled line blade 6b ... Top surface part 7 ... Shallow blade part 8 ... Deep blade part 9 ... Groove part

Claims (11)

A plastic sheet with a folded ruled line provided with a concave folded ruled line having a pair of side and bottom parts inclined at a predetermined angle and facing each other,
A part of the bottom surface of the bent ruled line is a shallow groove part spaced apart in the longitudinal direction of the ruled line, and is a deeper groove part than the shallow groove part , and is semicircular, arc-shaped, trapezoidal, square, triangular A plurality of deep groove portions formed in any cross-sectional shape are continuously formed between the shallow groove portions in the longitudinal direction of the ruled line, and a bottom surface part of the bent ruled line is constituted by a shallow groove part and a deep groove part. Folded ruled plastic sheet with configuration.
  The plastic sheet with a folded ruled line according to claim 1, wherein the pitch interval B1a between the shallow groove portion and the deep groove portion is set to be narrower than the pitch interval A1 of the shallow groove portion and wider than the pitch interval B1 of the deep groove portion. .   The plastic sheet with a bent ruled line according to claim 1, wherein the width C1 of the shallow groove portion is set to be wider than the width D1 of the deep groove portion.   The plastic sheet with a bent ruled line according to any one of claims 1 to 3, wherein the shallow groove portion and the deep groove portion are formed in any one of a semicircular shape, an arc shape, a trapezoidal shape, a quadrangular shape, and a triangular shape.   The shallow groove portion and the deep groove portion are formed in an elliptical shape when viewed from above, and the elliptical shape is arranged so as to obliquely intersect the longitudinal direction of the ruled line. Plastic sheet with bent ruled lines according to crab.   The plastic sheet with a folded ruled line according to any one of claims 1 to 5, wherein one or a plurality of substantially intermediate groove portions deeper than the shallow groove portions and shallower than the deep groove portions are formed between the shallow groove portions. A plastic sheet ruled line blade having a pair of side surfaces that are inclined at a predetermined angle and are opposed to each other, used when attaching a folded ruled line to a folded part of a plastic sheet,
A blade part having a shallow bite amount is formed at a distance in the longitudinal direction along the top surface part of the ruled line blade, and a blade part having a deeper bite amount than the shallow blade part , having a semicircular shape and an arc shape A plurality of deep blade portions formed in a trapezoidal shape, a quadrangular shape, or a triangular cross-sectional shape are continuously formed in the longitudinal direction between the shallow blade portions, and the top surface portion is deep with the shallow blade portion. A ruled line blade for a plastic sheet having a configuration comprising a blade portion.
  The plastic according to claim 7, wherein the pitch interval B2a between the shallow blade portion and the deep blade portion is set to be narrower than the pitch interval A2 of the shallow blade portion and wider than the pitch interval B2 of the deep blade portion. Sheet ruler blade.   The ruled line blade for plastic sheets according to claim 7 or 8, wherein the width C2 of the shallow blade portion is set to be wider than the width D2 of the deep blade portion.   The ruled line for a plastic sheet according to any one of claims 7 to 9, wherein the shallow blade portion and the deep blade portion are formed in any one of a semicircular shape, an arc shape, a trapezoidal shape, a square shape, and a triangular shape. blade.   The amount of biting is deeper than that of the shallow blade, and one or more intermediate blades having a depth of biting that is shallower than that of the deep blade are formed between the shallow blades. Ruled line blade for plastic sheet.

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