JP3989483B2 - Folding ruled line blade used for manufacturing plastic sheet with bent ruled line - Google Patents

Description

  The present invention relates to a folding ruled line blade used for manufacturing a plastic sheet with a folded ruled line, which can form a plastic case by bending a ruled line that has been drilled in advance.

  Conventionally, a plastic sheet with a folded ruled line, which is a material of a plastic assembly case (packaging container), is a flat plastic sheet formed by, for example, using a heated folded ruled line blade or heating and pressing a bent part at high frequency. A bent ruled line was formed at the bent portion. For example, as shown in FIG. 6A, the bent ruled line at this time is a single straight groove having an arbitrary width by pressing the bent portion P with a bent ruled line blade having a straight edge or a high frequency. As shown in FIG. 6B or FIG. 6B, the bent portion P is pressed by a sewing blade-like bent ruled line blade in which the cutting edge is intermittently cut and the concave and convex portions are alternately formed in the length direction. As a result, the perforated cutout portion 102 is formed.

  In addition, as an example of a conventional plastic sheet with a bent ruled line, a plastic sheet is sandwiched between a ruled line blade formed with irregularities obtained by intermittently cutting out the blade edge and a flat cradle, thereby forming a plastic sheet. There is one that discloses a technical content in which a concave groove on the surface of a sheet and an intermittent hole formed along the length direction of the bottom of the concave groove are formed simultaneously (see Patent Document 1).

  And as an example of the conventional ruled line blade for plastic sheets, the cutting edge has an uneven shape that is intermittent in the length direction, the width of the tip of the convex part is within 0.5 mm, and the cutting edge angle is 30 ° to 130 °. There exists what disclosed a certain technical content (refer patent document 2).

  Furthermore, as another conventional example of a plastic sheet with folding ruled lines, shallow concave grooves and deep concave grooves or cuts are alternately formed in the length direction of the folding lines, and the shallow concave grooves and deep concave grooves or slits are formed. The technical content which formed the reinforcement rib in the boundary is disclosed (see Patent Document 3).

In addition, the deep groove portion formed while the convex portion of the blade edge is pushed into the sheet and expanded, and the extending portion formed by extending in the width direction by the convex portion are alternately provided in the length direction. The technical content is that the plastic part between the convex parts is stretched in the width direction by spreading and forming the stretched part between the deep groove parts without touching the bottom part of the concave part of the blade edge to the sheet Is disclosed (see Patent Document 4).
Japanese Patent No. 2536538 Japanese Patent No. 2541252 Japanese Patent No. 2541253 Japanese Patent No. 2889884

  However, when the cutting edge P is pressed by a straight bent ruled blade or a high frequency or the like to form a single linear groove portion 101 as in the prior art, the restoring force which is a property of plastic over time As a result, the groove portion gradually returns to the original flat shape, and the hoisting force (the force for bending the ruled line portion to 90 °) increases, which makes it difficult to bend. Further, in the case of the technical contents disclosed in Patent Documents 1 to 4, the plastic sheet between the bent ruled lines is warped because the bent portion P itself of the plastic sheet is thinned by strongly pressing with a large crushing force, The physical property strength of the part will fall and it will become easy to fracture | rupture. In the case of a bent ruled line formed as a perforated cutout portion 102 by pressing the bent portion P with a perforated bent ruled line blade, the perforated cutout portion 102 is not cut out and the original is not cut out. Since it remains as a flat plastic sheet, it becomes difficult to bend, and the flat portion between the perforated cutout portions 102 is easily broken by excessive tension acting on the cutout portions. Was.

  Therefore, the present invention has been created in view of the conventional circumstances as described above, and is a folding that can be easily formed by forming a folding ruled line that is easy to bend and at the same time is not easily broken, with little change in the lifting force. It aims at providing the bending ruled line blade used for manufacture of the plastic sheet with a ruled line.

In order to solve the above-described problems, the folded ruled line plastic sheet manufactured by the ruled line blade of the present invention is a folded ruled line plastic sheet capable of forming a plastic case by bending a ruled line that has been drilled in advance. The bent ruled line 2 is a deep groove part 3 formed by pressing the flat convex part 12 in the bent ruled line blade 11 and a notch part 4 so-called shallow groove part formed by a concave part 13 between the flat convex parts 12. Are provided in the length direction, and the deep groove portions 3 and the cut portions 4 are alternately arranged or intermittently arranged.
Specifically, it is a plastic sheet with a folded ruled line capable of forming a plastic case by folding a pre-perforated ruled line, and the bent ruled line 2 has a pointed edge of a saw blade edge cut off. The deep groove portion 3 formed while being pushed and expanded in the width direction by being pressed by the flat convex portion 12 and the straight cut portion 4 punched out by the cutting edge of the concave portion 13 between the flat convex portions 12 are long. They are provided alternately in the vertical direction.
And the tear strength in the bending ruled line 2 shall be 3.0-8.0N.
Moreover, in the manufacturing method of the plastic sheet containing the folding ruled line by using the ruled line blade, the folded ruled line blade 11 formed by providing the flat convex part 12 and the concave part 13 between the flat convex parts 12 is used as the plastic sheet. The deep groove portion 3 is formed by pressing the bent portion P and pressing the convex portion 12 and forming the cut ruled line 2 by forming the cut portion 4 by the concave portion 13. The deep groove portion 3 and the cut portion 4 are They can be arranged alternately or intermittently.
More specifically, a flat convex portion 12 in which the pointed end of a saw blade is cut off, and a concave portion 13 that leaves the blade tip portion between the flat convex portions 12 are alternately provided in the length direction. The bent ruled line blade 11 is pressed against the bent portion P of the plastic sheet, and the deep groove portion 3 is formed by pressing by the convex portion 12, and the straight cut portion 4 is formed between the deep groove portions 3 by punching the blade edge of the concave portion 13. The bent ruled line 2 is formed by forming.
Further, the folded ruled line blade 11 used in the method for producing a plastic sheet with a folded ruled line as described above has a flat convex part 12 and a concave part 13 having a cutting edge between the flat convex parts 12 in the length direction. The protrusions 12 and the recesses 13 are alternately arranged or intermittently arranged.
More specifically, a flat convex portion 12 in which the pointed end of a saw blade is cut off, and a concave portion 13 that leaves the blade tip portion between the flat convex portions 12 are alternately provided in the length direction. The shape of the convex portion 12 is a truncated hexagonal pyramid in which the tip of the blade tip having a symmetrical side and a symmetrical front and rear edge, or the tip of the oblique side and the vertical side is partially cut. The concave portion 13 is formed in a triangular groove shape, and the shape of the cutting edge can be formed into an arch shape.
Further, the packaging container is formed in a box shape by the above-described plastic sheet with bent ruled lines. That is, the deep groove portion 3 formed by pressing the flat convex portion 12 in the bent ruled line blade 11 and the cut portion 4 so-called shallow groove portion formed by the concave portion 13 between the flat convex portions 12 in the length direction. It is formed in a box shape or a case shape by a plastic sheet having a folding ruled line 2 provided, and the deep groove portions 3 and the cut portions 4 in the folding ruled line 2 are arranged alternately or intermittently. It is arranged in. More specifically, the deep groove portion 3 formed while being pushed and expanded in the width direction by pressing with the flat convex portion 12 with the pointed end of the saw-toothed blade cut off, and the flat convex portion 12 between each other. The straight cut portions 4 punched out by the cutting edge of the concave portion 13 are alternately provided in the length direction, and formed into a box shape and a case shape by a plastic sheet with a bent ruled line having a bent ruled line 2 formed in advance. It is done. Moreover, the tear strength at the folding ruled line 2 in these packaging containers can be 3.0 to 8.0 N.

In the plastic sheet with a folded ruled line according to the present invention configured as described above, the folded ruled line 2 in which the deep groove portion 3 and the cut portion 4 are provided in the length direction is referred to as easy to bend and difficult to cut. It is possible to realize a bending process in a complementary state.
The deep groove portion 3 is wide and the cut portions 4 are linear. In particular, these are alternately arranged to further facilitate the folding operation and prevent breakage at the folding ruled line portion. Realize a sharp edge that becomes the ridgeline of time.
In the manufacturing method of a plastic sheet with bent ruled lines, when the bent ruled line blade 11 is pressed against the bent portion P of the plastic sheet, the punching process is performed at the edge of the recess 13 with the pressing at the position of the convex part 12. As a result, the binding of the molecules in the plastic at the folding ruled line 2 is intermittently separated so that the molecules cannot be partially regenerated, thereby assisting the folding action through the deep groove portion 3.
A folding ruled line blade 11 used for manufacturing a plastic sheet with a bent ruled line is, for example, a blade having a symmetrical side and a front / rear symmetrical oblique edge, or a cutting edge having a sharp edge such as a blade edge composed of an oblique side and a vertical side. The deep groove portion 3 is formed while the convex portion 12 formed in the shape of a pyramid is bitten into the bent portion P of the plastic sheet and is expanded, and at the same time, the deep groove portion is formed by the arch shape of the cutting edge of the triangular groove-shaped concave portion 13. A straight cut portion 4 is formed between the three.
When the tear strength is 3.0 to 8.0 N, it is difficult to tear when assembled and formed into a box shape, and it is easily folded into a predetermined box-shaped packaging container or the like.
A packaging container assembled and formed into a box shape or the like by the above-described plastic sheet with a folded ruled line becomes a beautiful folded line because its ridgeline is formed by a folded ruled line 2 comprising an array of deep groove portions and cut portions. Appearance is maintained.

  According to the present invention, it is possible to easily process and form the bent ruled line 2 which is easy to be bent over a long period of time and is not easily torn and broken at the bent portion P in the plastic sheet for assembling and forming the plastic case, thereby folding the plastic sheet. By easily bending the portion P, for example, a box / case made of a plastic sheet having a predetermined thickness can be easily assembled and configured.

  That is, the present invention has a length of the deep groove portion 3 formed by pressing the flat convex portion 12 in the bent ruled line blade 11 and the cut portion 4 formed by the concave portion 13 between the flat convex portions 12. This is because the bent portion P of the plastic sheet having a predetermined thickness can be reliably bent without breaking or separating.

  Further, the deep groove portion 3 is formed by being pressed and spread in the width direction by pressing with the flat convex portion 12 with the pointed edge of the saw-toothed blade cut off, and the cutting edge of the concave portion 13 between the flat convex portions 12. Boxes that are packaged containers that are assembled and formed into a box shape or a case shape by bending the punched straight cut portions 4 alternately in the length direction so that the bent portions P of the plastic sheet can be bent sharply. The ridge line part in the body / case can be highlighted.

  Further, in the manufacturing method according to the present invention, the deep groove portion 3 and the shallow groove-shaped cut portion are formed by the bent ruled line blade 11 provided with the flat convex portion 12 and the concave portion 13 between the flat convex portions 12. Since the folding ruled line 2 having 4 is formed, for example, in bending punching, auton punching, etc., it is possible to easily determine the condition of the flexibility of the bent portion P when bending the plastic sheet.

  In addition, a bent ruled edge blade in which a flat convex portion 12 in which the point of a saw blade edge is cut off and a concave portion 13 in which the blade tip portion between the flat convex portions 12 is left are alternately provided in the length direction. 11 is pressed against the bent portion P of the plastic sheet, and the deep groove portion 3 is formed by pressing by the convex portion 12, and the straight groove portion 3 is formed between the deep groove portions 3 by punching the blade edge of the concave portion 13 to bend. Since the ruled line 2 is formed, the bent ruled line 2 has a cutting edge at the concave portion 13 and has a great difference from the conventional crease line and perforated ruled line for the purpose of bending. It is possible to easily produce an excellent plastic sheet with folded ruled lines.

  Furthermore, in the folding ruled line blade 11 according to the present invention, a flat convex portion 12 in which a pointed edge of a saw blade edge is cut off and a concave portion 13 in which a cutting edge portion between the flat convex portions 12 is left in the length direction. Since they are provided alternately, the bent ruled line blade 11 capable of simultaneously forming the deep groove portion 3 and the cut portion 4 can be easily produced simply by excising the pointed edge of the saw blade.

  In addition, the shape of the convex portion 12 is formed in a truncated hexagonal pyramid shape in which a tip portion such as a blade tip having a left-right symmetry, a front-rear symmetrical oblique side, or a blade edge composed of an oblique side and a vertical side is partially cut. The length of the convex portion 12 in the longitudinal direction can be variously changed, and the length of the deep groove portion 3 formed by pressing the convex portion 12 is set to the length of the cut portion 4 formed by punching the blade edge of the concave portion 13. Can be freely changed.

  Since the tear strength at the folding ruled line 2 is 3.0 to 8.0 N, it is difficult to tear even when folded when assembling and forming a packaging container. And it can be set as the packaging container with the favorable appearance provided with the ridgeline used as a sharp edge.

  Note that the reference numerals added in the means for solving the above-described problems and the effects of the invention are given for easy reference to the parts showing the components shown in the drawings. The present invention is not limited to the structure / shape indicated by the reference numeral.

  The best mode for carrying out the present invention will be described below with reference to the drawings. The reference numeral 1 shown in the figure can form a plastic case by bending a folding ruled line 2 that has been drilled in advance. For example, it is a sheet member of a plastic sheet with a bent ruled line made of a hard material such as polyvinyl chloride or polypropylene having a thickness of about 0.3 to 3.0 mm.

  For example, as shown in FIG. 5, the sheet member 1 is bent into a rectangular cylindrical shape through a bent portion P into a right side surface portion 1A, a front surface portion 1B, a left side surface portion 1C, and a back surface portion 1D, and one end side edge of the back surface portion 1D. The flap portion 1E extended to the right side surface portion can be attached to the right side surface portion, and the side flap 1F is folded at both ends of the right side surface portion 1A and the left side surface portion 1C, and the lid flap 1G is folded at both ends of the front surface portion 1B. It is extended through.

  As shown in FIG. 1, the sheet member 1 is formed into a shallow groove shape by being formed shallower than the deep groove portion 3 and the deep groove portion 3 formed while being pushed and expanded in the width direction with respect to the bent portion P. A bent ruled line 2 is formed in which straight cut portions 4 are provided along the length direction. At this time, the length of the deep groove portion 3 and the width of the cut portion 4 of the bent ruled line 2 along the length direction of the bent portion P may be substantially the same, or the magnitude relationship thereof may be arbitrary. Is.

  Moreover, these deep groove parts 3 and the notch parts 4 are provided alternately or intermittently, and the arrangement form thereof is arbitrary. However, as will be described later, in consideration of the fact that the deep groove portions 3 and the cut portions 4 are simultaneously formed in series by the bent ruled line blades 11 obtained by machining the saw blade edge, they are generally arranged alternately. The In the case of intermittent arrangement, a plurality of deep groove portions 3 are continuously arranged, or a plurality of cut portions 4 are continuously arranged. The cut portions 4 are irregularly arranged in an arbitrary number, and the shape of the cutting edge in the bent ruled line blade 11 is arranged correspondingly. In some cases, a bent ruled line blade 11 having a single convex portion 12 or concave portion 13 described later is continuously used repeatedly to cope with the formation of an array of continuous deep groove portions 3 and cut portions 4. .

  And the depth of the deep groove part 3 is 50 to 90% of the thickness of the sheet member 1, Preferably it is 60 to 80%. That is, if it is less than 50%, the hoisting force is large and returns to the original shape after processing, and if it exceeds 90%, the tear strength is weak and it is easy to break. On the other hand, the depth of the cut portion 4 is 20 to 50%, preferably 30 to 50% of the thickness of the sheet member 1. That is, if it is less than 20%, the hoisting force is large and returns to the original shape after processing, and if it exceeds 50%, the tear strength is weak and it is easy to break.

  Such a bent ruled line 2 is formed by strongly pressing a bent ruled line blade 11 as shown in FIG. That is, the bending ruled line blade 11 is, for example, as a saw blade edge of a rotary die cutter blade for punching, for example, a pointed portion of a blade edge sharpened in an isosceles triangle shape when viewed from a side surface formed of a laterally symmetrical, longitudinally symmetrical hypotenuse, Along the chain line shown in FIGS. 2 (a) and 2 (b), for example, by cutting off by a spark cutter, a milling machine, planar polishing, etc., the flat portion of the tip is substantially rhombic or spindle-shaped. It is formed into a substantially trapezoidal shape, and the top surface becomes a substantially hexagonal flat surface by polishing and grinding both side surfaces along the chain line shown in FIGS. 2 (c) and 2 (d) ( 2 (e)), a convex groove 12 having a truncated hexagonal pyramid shape is formed, and by pressing the bent portion P of the sheet member 1 by the convex portion 12, the deep groove portion 3 is formed while expanding in the width direction. As a thing. In addition, in the blade edge, the front and rear are along the horizontal direction in FIG. 2A, and the left and right are along the depth direction in FIG. 2A.

  At the same time, a straight cut portion 4 is formed by punching between the deep groove portions 3 with the cutting edges left without being cut off in the triangular groove-like concave portions 13 between the flat convex portions 12. is there. At this time, as shown in FIG. 3, the notch 4 is a recess corresponding to the notch 4 having a shallow groove shape so as not to penetrate the sheet member 1 and to be formed slightly shallower than the depth of the deep groove 3. The shape of the 13 cutting edges may be formed into an arch shape or the like. In this way, the deep groove portion 3 and the cut portion 4 extend along the length direction of the bent portion P by performing pressing at the position of the convex portion 12 of the bent ruled line blade 11 and punching at the blade edge at the position of the concave portion 13. Are alternately provided (see FIG. 4). In addition, the recessed part 13 is arch shape which has the ridgeline which continues from the vertex of the convex part 12 before excision in the front and back, and there is a hollow line on the right and left side surfaces of the bent ruled line blade 11 itself from the deepest part of the recessed part 13 itself. It is.

  In addition, the shape of the convex part 12 includes, for example, a blade tip made of an oblique side that is asymmetrical in the front and rear, or an oblique side and a vertical side, in addition to a shape obtained by cutting and removing the tip portion of the blade tip made up of a laterally symmetrical and longitudinally symmetrical oblique side. It may be formed in a truncated hexagonal pyramid shape in which a pointed portion such as a blade edge is partially cut. At this time, the tip plane shape in the case of an asymmetrical hypotenuse is shorter in the longitudinal direction than the tip plane shape in the case of an oblate symmetric hypotenuse, and the tip plane shape in the case of the hypotenuse and vertical sides respectively. The length is even shorter than that described above. In this way, the length of the deep groove portion 3 formed by pressing the convex portion 12 is changed to a length formed by punching the blade edge of the concave portion 13 by making the lengths of the convex portions 12 in the longitudinal direction different from each other. The length of the portion 4 can be freely changed.

  Moreover, the recessed part 13 which forms the cut | notch part 4 in the sheet | seat member 1 is utilized as an eye (sawtooth) as it is as a part which is a hollow between the convex parts 12 in a saw blade, as shown in figure However, it may be an acute or obtuse square, or it may be a circular arc although not shown. In the present invention, the saw blade itself does not have a so-called clamming (tooth swing), the upper and lower blades are symmetrical in the length direction of the bent ruled blade 11 itself, and the left and right sides gradually become crests (points). It is cut and formed into a cone shape so as to be thin, and the folded ruled line blade 11 according to the present invention is configured by cutting out the mountain portion.

  Next, a manufacturing method of a plastic sheet with a bent ruled line will be described. As a developed sheet member 1 for forming a plastic case, for example, a right side 1A, a front 1B, a left 1C, a back 1D, a back Folded portions P are respectively formed by folding a flap portion 1E extending at one end side edge of the portion 1D, a side flap 1F extending at both ends of the right side surface portion 1A and the left side surface portion 1C, and a lid flap 1G extending at both ends of the front portion 1B. (See FIG. 5).

  Then, the folded ruled line 2 is formed and processed by strongly pressing the folded ruled line blade 11 against the portion corresponding to the folded portion P of the sheet member 1. That is, a bent ruled line blade 11 is formed by providing a flat convex portion 12 with a sharp edge of a saw blade edge cut off and a concave portion 13 leaving a blade edge portion between the flat convex portions 12 in the length direction. Is pressed against the bent portion P of the sheet member 1 to form the deep groove portion 3 while the convex portion 12 bites into and spreads the bent portion P, and at the same time, a straight cut is made between the deep groove portions 3 by punching the blade edge of the concave portion 13. Part 4 is formed (see FIG. 4). At this time, as shown in FIG. 3, the cut portion 4 is formed to be slightly shallower than the depth of the deep groove portion 3 without penetrating the sheet member 1.

  Thus, by bending the sheet member 1 into a mountain fold shape or a valley fold shape via the folding ruled line 2 formed in the bent portion P of the sheet member 1, a plastic case in which the folded ruled line 2 becomes a ridge line is formed. Is done. That is, the right side surface portion 1A, the front surface portion 1B, the left side surface portion 1C, and the back surface portion 1D are bent into a rectangular cylindrical shape via the folding ruled line 2, and then the flap portion 1E extending to one end side edge of the back surface portion 1D is After being overlapped with 1A, it is adhered by, for example, heat sealing processing or glue material, and the side flaps 1F at both ends of the right side surface portion 1A and the left side surface portion 1C are folded inward via the folding ruled lines 2, and the front side portion 1B The lid flaps 1G at both ends may be folded inward via the two-stage folding ruled lines 2, and then the outer portion of the lid flap 1G may be inserted into the back side.

  Further, the tear strength N of the bent ruled line 2 formed in this way is 3.0 to 8.0 N, preferably 4.0 to 6.0 N. This is because when the tear strength N is less than 3.0 N, the ruled line portion is easily torn, and when it exceeds 8.0 N, the raising force of the ruled line portion is increased and it is difficult to bend. That is, the hoisting force is 8.0 N or less, preferably 4.5 N or less, and if it exceeds 8.0 N, it becomes difficult to bend, which is not preferable.

  A polypropylene sheet having a thickness of 0.3 mm is used as the sheet member 1, and the deep groove portion 3 and the notch portion are used as the ruled line blade by using the bent ruled line blade 11 described in FIGS. 2 (c), (d), and (e). 4 was formed. Table 1 shows the results of measuring the tear strength (N) and the hoisting force (N) of the folded ruled line portion 2.

Comparative Example 1

  The same sheet as in Example 1 was used as the sheet member 1, and a linear blade was used as the ruled line blade, to produce a ruled line-containing plastic sheet shown in FIG. The results of measuring the tear strength (N) and the hoisting force (N) of the ruled line portion are also shown in Table 1.

The measuring method is as follows.
Tear strength: Conforms to JIS K7128 “Plastic-Film and Sheet Tear Strength Test Method” Boxing Force: Shimadzu Tensile Tester DCS500 type sheet is placed and compressed at a compression speed of 100 mm / min. The maximum load when the part was bent to 90 ° was taken as the hoisting force.

  As is clear from Table 1, the sheet of Example 1 was difficult to tear and could be folded cleanly even after one week. On the other hand, in the sheet of Comparative Example 1, it was possible to bend it neatly as in Example 1 immediately after the production of the ruled line portion, but it did not bend sufficiently after one week, and it returned to its original state even after being folded once. .

It is a perspective view which shows an example of the plastic sheet containing a bending ruled line in the best form for implementing this invention. Similarly, an example of a bent ruled line blade is shown, and when configured by excision processing on a saw blade, (a) is a front view of the blade tip before excision, (b) is an XX sectional view in (a), and (c) is the blade edge. (D) is a YY cross-sectional view in (c), and (e) is a plan view after cutting and polishing of the blade tip. It is sectional drawing which similarly shows the state which forms the bending ruled line of a plastic sheet with a bending ruled line blade. It is a partially enlarged plan view of a plastic sheet with a bent ruled line. It is an expansion | deployment perspective view of the plastic sheet containing a bending ruled line when it is set as a packaging container similarly. The plastic sheet containing a bending ruled line in a conventional example is shown, (a) is a partially enlarged plan view in which the bent ruled line is a single linear groove, and (b) is a perforated cutout part. FIG.

Explanation of symbols

P ... bent portion 1 ... sheet member 1A ... right side 1B ... front 1C ... left side 1D ... back 1E ... flap 1F ... side flap 1G ... lid flap 2 ... bent ruled line 3 ... deep groove 4 ... notch 11 ... Bending ruled line blade 12 ... convex part 13 ... concave part 101 ... groove part 102 ... cutout part

Claims (1)

  A flat convex part in which the point of the saw blade edge is cut off and a concave part that leaves the blade part between the flat convex parts are alternately provided in the length direction, and the shape of the convex part is It is formed in a truncated hexagonal pyramid shape that is a part of the tip of the blade tip that has a symmetric and longitudinally symmetric oblique edge, or a part of the tip portion of the oblique edge and the vertical edge, and has a triangular groove shape and the shape of the blade edge. A folding ruled line blade used for the production of a plastic sheet with a folded ruled line, which is formed into an arch shape.

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