JP2006000968A - Cutter for forming intermittent slit in resin sheet, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutter for forming intermittent slits in a resin sheet for machining intermittent slits with the fixed directions of tearing formed from the ends of slits in parting without causing unevenness of cuts at both ends of the slits cut with a cutting edge. <P>SOLUTION: The cutter 11 for forming the slits in the resin sheet is provided with cutting edges 13 and non-cutting edge parts 14 alternately at the tip edge of a cutter plate 12 to form the intermittent slits in the resin sheet. The non-cutting edge parts 14 of the cutter plate 12 are formed of recesses recessed from the cutting edges 13, and inclined cutting edges 15 are provided on both side edge parts of each recess. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

This invention uses a resin sheet to divide a product such as food into a plurality of parts, and in a resin container in which a plurality of containers are coupled via a flange portion at the upper edge, the flange portion for the resin container is used. The present invention relates to a cutting tool for forming a slit in a resin sheet, which is used for processing a slit in order to facilitate the division of each container, and a method for manufacturing the same.

  For example, as shown in FIG. 4, a packaging form of a product such as frozen food can be conveniently used as many times as necessary, and a plurality of sub-containers 1 are coupled via a flange portion 2 at the upper edge. The resin container 3 is used, and the product is packaged in a state where the product is stored in each of the divided containers 1.

  By the way, the resin container 3 as described above is formed by simultaneously molding a plurality of sub-containers 1 projecting from one resin sheet material to one surface side of the sheet material by vacuum molding. In order to be able to easily perform each one, the flange portion 2 between the adjacent sub-containers 1 is processed to provide a slit 4 along the length direction for separation, and each sub-container 1 is divided from the portion of the sub-cut 4 By doing so, the product can be taken out one by one together with the subdividing container 1.

  Conventionally, the intermittent cuts 4 to be cut into the subdivided containers, which are applied to the flange portion 2 of the resin container 3 as described above, are alternately arranged with straight cuts 4a and unbroken parts 4b, which are usually called perforations. The structure is adopted and provided along the length direction of the flange portion 2.

  As shown in FIG. 5, a conventional cutting tool 5 used to make a linear slit 4 in the flange portion 2 of the resin container 1 as described above has a straight cutting edge 7 at the leading edge of the cutting board 6. And cut-out blades 8 with recessed cutouts are alternately provided at regular intervals, cut with the blade 7 placed upward and the flange mounted on the blade 7 being pushed down. Then, the cutting edge 4 is machined as shown in FIG. 4 because the cutting edge 4 makes the cut 4a and the cut-off blade portion 8 becomes the unbroken portion 4b.

  By the way, in the conventional blade 5 as described above, since the notch portion 8 is formed by a concave notch, both side edges of the notch blade portion 8 are left with the plate thickness of the blade 5 as they are. Therefore, when the sheet material is cut with the blade 5, both edges of the cut edge portion 8 without the blade edge are formed on the sheet material at both ends of the cut 4a cut by the blade edge 7. It will forcibly enter, and cut spots appear at both ends of the formed cut.

  If there are spots as described above at both ends of the cut 4a, when each subdivided container 1 is to be cut off from the portion of the intermittent cut 4, the splitting force is generated at the cut 4a from the end of the cut 4a. Since the direction of is not fixed and the tear may not reach the cut 4a at the next position, there is a problem that a situation occurs in which the tearing of the sub-container 1 cannot be easily performed.

  Therefore, the object of the present invention is to provide a cutting edge also on the side edge of the notch, so that there is no occurrence of cut spots at both ends of the cut cut by the cutting edge, and the tear that occurs from the end of the cut at the time of division is generated. An object of the present invention is to provide a cutting tool for forming a slit in a resin sheet and a method for manufacturing the cutting tool, which can process the slit in a fixed direction.

  In order to solve the above-described problems, the invention of claim 1 is to form a cut in a resin sheet in which a blade edge and a cut-off blade portion for forming intermittent cuts in the resin sheet are alternately provided at the leading edge of the blade plate. In the cutting tool, a configuration is adopted in which the cut edge portion of the blade plate is formed by a recess that is recessed from the cutting edge, and the cutting edge is provided at the edge of the recess.

  According to a second aspect of the present invention, there is provided a method for manufacturing a cutting tool for forming a cut in a resin sheet, in which a cutting edge and a cutting edge for alternately forming a slit in the resin sheet are provided at a leading edge of the cutting board. A vertical cut extending inward from the blade edge and a transverse cut continuous with the inner end of the vertical cut are provided, and the portion surrounded by the blade edge, the vertical cut and the horizontal cut of the blade plate is bent inward along the plate thickness direction. By adopting such a configuration, a configuration in which the cut-off blade portion is formed by a recess in which the blade tip is recessed is employed.

  According to the invention of claim 1, since the cut-off blade portion of the blade plate is formed by a recess recessed from the blade edge, and the blade edge is provided at the edge of the recess, both ends of the cut formed by cutting the sheet material with the blade edge are Because it is cut with the cutting edge provided at the edge of the recess, there is no occurrence of cuts at both ends of the cut, and the intermittent cut processed into the sheet material is a tear that occurs from the edge of the cut when the sheet material is divided The direction becomes constant, and therefore the slits can be machined while the tear direction of the sheet material becomes constant.

  Further, according to the invention of claim 2, it is possible to easily manufacture a cutter capable of processing a slit cut while the tear direction of the sheet material is fixed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the first embodiment of the first embodiment shown in FIG. 1, the cut edge forming blade 11 has a linear cutting edge 13 and a notch edge portion 14 alternately at regular intervals at the tip edge of a blade plate 12 using a steel material for a blade. The cut-off blade portion 14 of the blade plate 12 is formed by an inclined depression that is recessed from the cutting edge 13, and the inclined blade edge 15 is provided on both side inclined edges of the depression.

  In order to manufacture the above-described intermittent cut forming blade 11, as shown in FIG. 1A, a straight blade edge 13 is processed at the tip of a horizontally long blade plate 12, and the tip of this blade plate 12 is formed. A longitudinal notch 16 extending inward from the blade edge with a required width at a constant interval in the length direction, and bent to both sides from the inner end of the longitudinal notch 16 and transversely cut along the length direction of the blade plate 12 A notch 17 is provided in a T-shaped arrangement, and then the U-shaped portions 18 on both sides surrounded by the cutting edge 13 of the blade plate 12, the vertical notch 16 and the horizontal notch 17 are as shown in FIG. By using the space of the vertical cutout 16 and the horizontal cutout 17 to bend inward along the thickness direction of the blade plate 12, the cutting edges of the U-shaped portions 18 on both sides are inclined to each other from both sides. 13 is recessed, and a notch portion 14 is formed by a recess due to the recess. There.

  In this way, by bending the U-shaped portions 18 on both sides inward along the thickness direction of the blade plate 12, the missing blade portions 14 are arranged at regular intervals at the tip portion where the blade tip 13 of the blade plate 12 is formed. Provided, the cutting edge 13 and the cut-off edge portion 14 are alternately arranged, and the cut-off cutting edge portion 14 includes the inclined cutting edge 15 continuous with the cutting edge 13 at the inclined edge portions on both sides. That is, the part located in the U-shaped portion 18 of the original cutting edge 13 becomes the inclined cutting edge 15 as it is, and the step of forming the inclined cutting edge by post-processing is not necessary.

  In the second embodiment of the second embodiment shown in FIG. 2, the cut edge forming blade 11 is provided with the linear cutting edge 13 and the missing blade portion 14 alternately on the tip edge of the blade plate 12 using the steel material for the blade. The cut-off blade portion 14 of the plate 12 is formed by an inclined depression that is recessed from the cutting edge, and the inclined cutting edge 15 is provided on one inclined edge of the depression.

  In order to manufacture the cut edge forming blade 11 of the second embodiment, a straight blade edge 13 is processed at the tip of a horizontally long blade plate 12 as shown in FIG. A vertical notch 16 extending inward from the blade edge 12 with a predetermined width at a constant interval in the length direction at one end of the blade 12, and one side along the length direction of the blade plate 12 from the inner end of the vertical notch 16 2b is provided in an L-shaped arrangement, and the U-shaped portion 18 on one side surrounded by the cutting edge 13, the vertical notch 16 and the horizontal notch 17a of the blade plate 12 is formed as shown in FIG. ), The blade edge of the U-shaped portion 18 on one side is inclined from one side and is recessed more than the blade edge 13 by being bent inward along the thickness direction of the blade plate 12, and a recess due to this recess. The notch edge part 14 is formed.

  In this way, by bending the U-shaped portion 18 on one side inward along the plate thickness direction of the blade plate 12, the missing blade portions 14 are arranged at regular intervals at the tip portion where the blade edge 13 of the blade plate 12 is formed. Provided, the cutting edge 13 and the cut-off edge portion 14 are alternately arranged, and the cut-off cutting edge portion 14 is provided with an inclined cutting edge 15 continuous with the cutting edge 13 on one inclined edge portion.

  The cut line forming blade 11 between the first and second embodiments is configured as described above, and the flange portion 2 is placed on the blade edge 13 of the blade 11 with the blade edge 13 facing upward. When the flange portion 2 of the resin container 3 in FIG. 4 is cut by pushing down 2, the cutting edge 13 cuts the cut portion 4a, and the cut-off blade portion 14 forms an uncut portion 4b, thereby separating each subdivided container 1 into pieces. Therefore, the cut line 4 is processed.

  In the processing of the intermittent cut 4 by the above-mentioned blade 11, since the cut edge portion 14 is an inclined blade edge 15 whose side edges on both sides or one side are continuous with the blade edge 13, the end portion of the cut line 4a cut by the blade edge 13 is inclined. As a result, the cutting edge 15 is finished, so that no cut spots are generated at both ends of the cut 4a, and when each subdivided container 1 is to be cut off from the intermittent cut 4 portion, the end of the cut 4a is cut by the cutting force. The direction of the tear generated in the unbroken portion 4b from the portion becomes constant, the tear reaches the next cut 4a accurately, and the subdividing container 1 can be easily torn off.

  Further, in the case of machining a half-cut intermittent cut that stops the cut 4a in the middle of the thickness of the flange portion 2, the notch blade portion 14 has an inclined cutting edge 15 whose side edges on both sides or one side are continuous with the cutting edge 13. In addition, there is no generation of resistance at the end of the blade edge 13, and as shown in FIG. 1 (c), the depth of the half-cut line 4a is made uniform, and the sub-container 1 can be easily torn without failure. Half-cut intermittent cuts 4 can be processed.

  A cut edge forming blade 11a in the third embodiment shown in FIG. 3 is a blade suitable for overlapping a plurality of sheets, and a straight cutting edge 13 is formed at the tip edge of the blade plate 12 using the steel material for the blade. And the cut-off blade portions 14 are alternately provided at predetermined intervals, and the cut-off blade portions 14 of the blade plate 12 are formed by cut-outs 19 provided so as to expand inward from the cutting edge 13 toward the inside. .

  When the flange portion 2 in which a plurality of sheets are overlapped is cut with the slit forming blade 11a of the third embodiment, the cutting edge 13 is cut and the cutout portion 14 is not cut, so that the subdivided container Intermittent cuts 4 for cutting one by one are machined. At this time, the cutting edge 13 penetrates the thickness of the flange portion 2, so that the unbroken portion 4 b is accommodated in the notch 19. Since the inside of the notch 19 is wide on both sides, both ends of the unbroken portion 4b do not interfere with the blade plate 12 at all, and the intermittent width is made constant and uniform by eliminating the generation of resistance. The cut 4 can be processed.

  Of course, such a slit 4 having a constant and uniform gap width is formed by the splitting force generated from the end of the slit 4a when the sub-container 1 is divided from the gap 4 portion. By making the direction constant, the sub-container 1 can be easily torn without failure.

(A) is the front view of the state which gave the vertical notch and the horizontal notch in the cutting tool for intermittent cut formation of 1st Embodiment, (b) is the front view of the completed cutting tool for the same line cut, (c) Is an enlarged longitudinal sectional view of a flange portion in which a half-cut intermittent cut is processed into a sheet material with this intermittent cut forming blade (A) is the front view of the state which gave the vertical notch and the horizontal notch of the cutting tool for slit formation of 2nd Embodiment, (b) is the front view of the completed cutting tool for the same score cutting line Front view showing a cutting tool for forming a slit in the third example Top view of resin container with intermittent cuts Front view of a conventional blade for forming intermittent cuts

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Subdivision container 2 Flange part 3 Resin container 4 Intermittent cut 4a Cut 4b Unbroken part 11 Blade 11a Blade 12 Blade plate 13 Cutting edge 14 Notch 15 Inclined cutting edge 16 Vertical notch 17 Horizontal notch 18 U-shaped part 19 Notch

Claims (2)

  In a cutting tool for forming a cut in a resin sheet in which a cutting edge and a cutting edge for alternately forming a slit in the resin sheet are provided at the leading edge of the cutting board, the cutting edge of the cutting board is more recessed than the cutting edge. A cutting tool for forming intermittent cuts on a resin sheet, characterized in that it is formed by a dent that is formed and a cutting edge is provided at the edge of the dent.   In the manufacturing method of a cutting tool for forming a cut in a resin sheet in which a cutting edge and a cut-off blade portion are alternately provided at the leading edge of the cutting board in the resin sheet, a vertical direction from the cutting edge toward the inside is provided on the cutting board. A cutting edge and a horizontal cutting line connected to the inner end of the vertical cutting line are provided, and the cutting edge of the blade plate is bent inwardly along the thickness direction by bending the cutting edge of the blade plate and the portion surrounded by the vertical cutting line and the horizontal cutting line so that the cutting edge is recessed A method for manufacturing a cut for forming a slit in a resin sheet, wherein a cut-off blade portion is formed by a recess that has entered.

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