JP2006021292A - Paper saw blade, manufacturing method thereof, and manufacturing apparatus - Google Patents

Abstract

A method and apparatus for manufacturing a paper saw blade having a sharp cutting edge at low cost and for easily mounting the paper saw blade thus obtained at a predetermined position of a carton.
A portion corresponding to one of left and right ridge lines in each crest of a sawtooth portion of a paper saw blade is flattened with a flat blade 3 and then a remaining ridge line 102 '' is left. Is cut by the movable blade 6 and the fixed blade 7, and the point 101a of the sawtooth portion 110 is formed at the intersection of one ridge line 102 'formed in the previous stage and the other ridge line 102 "formed in the subsequent stage.
[Selection] Figure 4

Description

The present invention relates to a paper saw blade to be attached to a storage box (hereinafter referred to as “carton”) for storing a packaging film (hereinafter referred to as “wrap film”), aluminum foil or cooking sheet for packaging food or the like. The present invention relates to a method and an apparatus for manufacturing a paper saw blade from an original fabric.
The paper saw blade targeted by the present invention includes a “resin-cured paper blade” obtained by applying or impregnating a curable resin to a paperboard and cured, and a “VF blade” made of vulcanized fiber. In the present invention, the curable resin includes a thermosetting resin and an ultraviolet curable resin.

Cartons for storing rolled wrap films, aluminum foil, and cooking sheets (hereinafter referred to as wrap films) are provided with saw blades at the edges of their front, bottom or lid plates, and when necessary The films are pulled out by an arbitrary length, cut through the saw blade, and used as a desired length.
The saw blade that cuts these wrap films is conventionally made of metal, but in recent years, paper saw blades made of paper have been used from the viewpoint of safety in handling and incineration at the time of disposal. It is being
This seed paper saw blade is made of a cellulose fiber and a so-called “resin-cured paper blade” in which a paperboard is used as a raw material, and a raw material obtained by applying or impregnating a curable resin with a paperboard is cut into a sawtooth shape to form a saw blade. The raw paper is laminated and integrated to a certain thickness using the swelling and gelatinization action of zinc chloride, and then the vulcanized fiber obtained by extracting and removing the zinc chloride and drying and molding is used as the raw fabric, punched into a sawtooth shape and sawed Two types of so-called “VF blades” that are blades are mainly known. These two types of paper saw blades are excellent in both safety and disposal.

  Further, as a method for manufacturing the seed paper saw blade, for example, the upper blade and the lower blade are engaged with each other according to the operation of the die set mechanism, so that the paper saw blade is pressed by a shearing method. A method of punching out from a sheet is known (see Patent Document 1).

  By the way, since this seed paper saw blade cannot be denied that the sharpness is inferior to that of a metal blade, in order to smoothly cut the wrap film, the peak portion 101 and the valley portion 102 of the paper saw blade 100 are used. In the sawtooth-like portions 110 that are alternately arranged, it is required that the tip 101a of each peak 101 is sharp (the blade tip is sharp) (see FIG. 13 and the like).

  However, in the method of Patent Document 1, since the sawtooth portion is punched out by the shearing method by the engagement between the upper blade and the lower blade, the constituent fiber of the original fabric is partially peeled off at the sawtooth portion that is the shear portion As a result, the sharpness of the cutting edge was lacking compared to a metal saw blade, and the tip of the mountain portion tended to be rounded. The reason why such a phenomenon occurs is that the raw material to be punched is drawn into the gap between the upper blade and the lower blade, and therefore the gap between the upper blade and the lower blade is set to such an extent that the raw material does not retract. However, it is extremely difficult to set to such an extent that punching is properly performed and pulling of the original fabric does not occur.

FIG. 15A shows an enlarged photograph of each crest 101 of the sawtooth portion in the paper saw blade punched out from the original fabric by a conventional method. In this photograph, the tip 101a of the peak 101 is rounded, and the actual tip 101a is missing at a rate of about 10% with respect to the ideal shape having a square tip. As described above, each crest portion of the sawtooth portion punched out by the conventional method generally has a missing portion of about 10 to 15%.
That is, as shown in FIG. 14A, an ideal shape in which the virtual tip t ₄ formed by the intersection of the _two ridge lines t ₂ and t ₃ rising from the virtual base t ₁ becomes an acute isosceles triangle shape. height at the crest t to (distance from the virtual base _{t 1} to the virtual tip _{t 4) h 1,} (the distance from the imaginary base _{t 1} until the actual tip 101a) height in the actual ridges 101 _{h 2} is It is missing at a rate of about 10% and is punched as a rounded tip 101a, resulting in a paper saw blade lacking in sharpness of the cutting edge.

  In order to solve such a problem, the inventors of the present application only have a portion that becomes a cutting edge of a paper saw blade (a tip of each peak) in a state where a connection is left in a valley portion or a hypotenuse portion in a sawtooth portion. Previously proposed a paper saw blade manufacturing method by a two-stage punching method in which the joint portion is cut off with a joint cutting upper blade and lower blade (see Patent Document 2).

Japanese Patent Laid-Open No. 6-48428 JP-A-8-276517

  However, the method disclosed in Patent Document 2 sharply cuts only the portion (the tip of each crest) that becomes the cutting edge of the paper saw blade in a state where the connection is left in the valley portion or the oblique side portion in the sawtooth portion. It was difficult to produce a knife blade, and as a result, there was a problem that the cutting edge was not sharp and the manufacturing cost of a paper saw blade was high.

  The present invention has been made in view of such a conventional situation, and an object of the present invention is to provide a method for easily and inexpensively manufacturing a paper saw blade having a sharp cutting edge and a paper saw obtained by the method. It is to propose a method for easily mounting the blade at a predetermined position of the carton, and an apparatus for carrying out these methods.

In order to achieve the above object, a paper saw blade according to the present invention includes a serrated portion in which crests and troughs are alternately arranged, and the shape of each crest in the serrated portion is a pointed corner. With respect to the ideal shape, the missing ratio of the tip is 5% or less (claim 1).
Here, the shape of each peak portion in the serrations, tip is the ideal form t is an angular shape, for example, as shown in FIG. 14 (b), the two rising from the imaginary base t ₁ at each peak portion The ridgelines t ₂ and t ₃ are smoothly extended to obtain the intersection, and the virtual tip t ₄ formed thereby is not round but has an acute shape.
Further, the loss rate of the apex with respect to the ideal shape is 5% or less with respect to the distance (height h ₁ ) from the virtual base side (side connecting the right and left valley bottoms of the peak portion) t ₁ to the virtual tip t ₄ . refers to the height missing proportion of h ₂ of the actual mountain section is less than or equal to 5%. That is, the relationship is expressed by the following formula.

As a method for obtaining a paper saw blade close to the ideal shape, at least a portion corresponding to one of the left and right ridge lines in each crest of the sawtooth portion and a portion corresponding to the other ridge line are separated. A multi-stage punching-type manufacturing method in which the tip of each crest portion in the serrated portion is formed at the intersection of one ridge line formed in the process and one ridge line formed in the previous stage and the other ridge line formed in the subsequent stage can be given. (Claim 2).
According to such a method, one ridge line and the other ridge line in each ridge portion are separately extracted, and the point of each ridge portion is formed at the intersection of the ridge lines, so that it has a serrated portion with a sharp cutting edge. A paper saw blade can be obtained.

As an aspect of the multi-stage punching-type manufacturing method, a portion corresponding to any one of the left and right ridge lines in each peak portion of the serrated portion is flattened with a flat blade and then a portion corresponding to the other ridge line remaining. Is cut with a movable blade and a fixed blade, and the tip of each peak in the sawtooth portion at the intersection of one ridge line formed in the preceding flat cutting process and the other ridge line formed in the subsequent cutting process And a two-stage punching method characterized in that a paper saw blade is cut off from the original fabric in a subsequent press-cutting process (claim 3).
According to such a method, the peak of each peak is formed at the intersection of one ridge line flattened by the flat blade and the other ridge line pressed (sheared) by the movable blade and the fixed blade. A paper saw blade having a serrated portion with a sharp cutting edge can be obtained, and the paper saw blade can be quickly punched from the original fabric by pressing with a movable blade and a fixed blade.
However, since the other ridge line is formed by pressing, the punched blank will be drawn into the gap between the movable blade and the fixed blade, and the tip of each crest may not be sharp. When the intersection of both ridge lines is shifted due to an error in the pitch or the like, there is a risk that the peak shape of each peak portion will vary.

Therefore, as a more preferable aspect of the multistage punching-type manufacturing method, a portion corresponding to any one of the left and right ridge lines in each crest of the sawtooth portion is left after being flattened by the first flat punching blade. The portion corresponding to the other ridge line is flattened with a second flat punching blade, and then the connecting portion left in each flat punching step is pressed with a movable blade and a fixed blade, and the flattening step in the previous stage A point of each peak in the serrated portion is formed at the intersection of one ridge line formed in step 2 and the other ridge line formed in the subsequent flattening step, and a paper saw is cut from the original fabric in the final pressing step. A three-stage punching method characterized in that the blade is cut off can be mentioned (claim 4).
According to such a method, the paper saw blade in which the tip of each peak is sharp by one ridge line flattened by the first flat blade and the other ridge line flattened by the second flat blade. Can be obtained more reliably.

  In the present invention, the shape of the valley portion of the sawtooth portion of the paper saw blade is semicircular (see FIG. 5), trapezoidal (see FIG. 7), V-shaped (see FIG. 13), etc. Is included.

For example, when manufacturing a paper saw blade having a V-shaped trough, after flattening the hypotenuse on one side of each crest, the remaining hypotenuse on the other side is cut or flattened to provide a saw blade with a sharp cutting edge A paper saw blade having a shape portion can be obtained.
However, in such a method, depending on the material and thickness of the original fabric, for example, a flat cutting blade having a shape corresponding to the right ridge line is pressed against the original fabric, and a portion corresponding to the right ridge line is determined. When cut, the flat cutting blade is in a state of biting into the original fabric, and it may be difficult to pull out the flat cutting blade from the original fabric.

Therefore, one ridge line formed in the preceding stage is a place corresponding to every other valley part of the sawtooth-shaped part, and the other ridge line formed in the subsequent stage is a place corresponding to the remaining valley part not cut in the previous stage. (Claim 5). In addition, the trough part in this invention means the ridgeline which connects between the cusps of an adjacent peak part.
That is, after cutting the ridge line corresponding to every other valley part, cut the ridge line corresponding to the remaining valley part that was not cut, and formed every other ridge line and the subsequent stage. A sawtooth portion having a sharp cutting edge can be formed at the intersection with the remaining ridgeline (see FIGS. 4, 6, 9, and 10).
In this case, when the flat cutting blade is pulled out after being pressed by pressing the flat cutting blade against the original fabric, the flat cutting portion is turned up so that the flat cutting blade can be easily extracted from the original fabric.
Considering the turnability of the flattened portion in the original fabric, it is preferable that the paper saw blade has a semicircular trough because the flattened blade can be more easily extracted from the original fabric.

Further, as a preferred embodiment of a method for manufacturing a paper saw blade having a trapezoidal valley, one ridge line formed by flattening at the front stage is a part including a hypotenuse on one side in the same direction at each peak, and The other ridge line formed by punching is the part that includes the hypotenuse on one side in the same direction that was not cut in the previous stage, and the bottom part that connects the hypotenuses of the adjacent peaks in the last stage tapping process. A three-stage punching method characterized in that it is a portion including a portion (claim 6).
The “part including the hypotenuse” by flattening the front stage and the rear stage means that, in addition to the hypotenuse, a part of the base connecting the hypotenuses of the adjacent mountain portions may be included.

In addition, when the paper saw blade separated from the original fabric as described above is attached to a predetermined position of the carton to obtain a carton with a paper saw blade, a heat-soluble film is provided on the surface as the original paper for the saw blade. Using the produced original fabric, and stacking the paper saw blade separated from the original fabric in the press-cutting process on a predetermined position of the carton, and welding the paper saw blade to the carton through the heat-soluble film. (Claim 7).
In this case, the paper saw blade can be punched and attached to the carton by a series of operations.

As an example of an apparatus for carrying out the manufacturing method according to the present invention, a flat cutting blade having a shape corresponding to every other valley in the serrated portion and a cradle for pressing the flat cutting blade from the vertical direction are provided. Front side flat punching means,
A rear-side pressing means having a movable blade having a shape corresponding to a portion not flattened by the flat blade in each valley portion of the serrated portion, and a fixed blade having a shape corresponding to the sawtooth portion;
A feeding means for feeding the original fabric at a fixed pitch from the front side flat punching means to the rear side pressing means;
The flat punching blade is pressed against a cradle that supports the original fabric, and portions corresponding to every other trough portion in the serrated portion of the original fabric are flattened, and then the original fabric is fed. Next, the movable blade is pressed against a portion that has not been flattened by the flat cutting blade in each trough portion of the serrated portion, and the movable blade is pressed by the fixed blade, and the front side flat blanking is performed. Forming a point of each crest in the sawtooth portion at the intersection of the ridge line formed by the means and the ridge line formed by the rear-side pressing means, and separating the paper saw blade from the original fabric A punching type manufacturing apparatus can be mentioned (claim 8).

In addition, a first flat punching means having a first flat cutting blade having a shape corresponding to every other valley in the serrated portion, and a cradle for pressing the flat cutting blade from the vertical direction,
A second-stage flattening means having a second flattened blade having a shape corresponding to a portion not flattened by the flattened blade in each valley portion of the serrated portion, and a cradle for pressing the flattened blade from the vertical direction ,
A final cutting means having a fixed blade having a shape corresponding to the serrated portion and a movable blade having a male-female engagement relationship with the fixed blade;
A feed means for feeding the original fabric at a fixed pitch from the front-side flat punching means to the final-stage pressing means;
The first flat punching blade is pressed against a cradle that supports the original fabric, and portions corresponding to every other trough portion in the serrated portion of the original fabric are flattened, and then the original fabric Is fed at a fixed pitch by the feeding means,
Next, after flattening by pressing the second flat cutting blade against the portion that has not been flattened by the first flat cutting blade in each trough portion of the serrated portion, the original fabric is fed by a feeding means. Fixed pitch feed,
Further, the connecting part left by each flat punching means is pressed by the movable blade and the fixed blade,
At the intersection of the ridge line formed by the front side flat punching means and the ridge line formed by the rear side flat punching means, the peak of each crest in the sawtooth portion is formed, and the paper from the original fabric by the final cutting means. A three-stage punching type manufacturing apparatus characterized in that the saw blade is cut off can be given.

In addition, a first flat-cutting means having a first flat cutting blade having a shape including a hypotenuse on one side of each crest in the same direction in the serrated portion, and a cradle for pressing the flat cutting blade from the vertical direction,
A second flat punching means having a second flat punching blade having a shape including a hypotenuse on one side in the same direction remaining in each peak portion of the serrated portion, and a cradle for pressing the flat punching blade from the vertical direction;
A final cutting means having a fixed blade having a shape corresponding to the serrated portion and a movable blade having a male-female engagement relationship with the fixed blade;
A feed means for feeding the original fabric at a fixed pitch from the front-side flat punching means to the final-stage pressing means;
The first flat cutting blade is pressed against a cradle that supports the original fabric, and after flattening a portion including a hypotenuse on one side of each crest of the original fabric in the same direction, The raw material is fed at a fixed pitch by feeding means,
Next, after flattening a portion including the oblique side of one side in the same direction that has not been flattened by the first flat punching blade in each peak portion of the serrated portion with the second flat punching blade, The raw material is fed at a fixed pitch by feeding means,
Further, the connecting part left by each flat punching means is pressed by the movable blade and the fixed blade,
At the intersection of the one-side hypotenuse in the same direction formed by the front-stage flat punching means and the remaining one-side hypotenuse in the same direction formed by the rear-stage flat punching means, a point of each peak in the sawtooth portion is formed, and the final stage A three-stage punching-type manufacturing apparatus characterized in that a paper saw blade is cut off from the original fabric by a pressing means of (No. 10).
In addition, the “part including the hypotenuse” flattened by the first and second flat punching blades means that in addition to the hypotenuse, it may include a part of the base connecting the hypotenuses of the adjacent peaks. .

  Further, as a device for obtaining a carton with a paper saw blade by attaching a paper saw blade separated from the raw fabric to a predetermined position of the carton, a heat-soluble film is provided on the surface as the paper saw blade original fabric. And further comprising welding means for welding the paper saw blade to a predetermined position of the carton, and the press saw means separates the paper saw blade from the original fabric, and the paper saw blade is moved to the predetermined position of the carton. And a manufacturing apparatus characterized in that the paper saw blade is welded to a carton by the welding means.

As described above, the present invention cuts the portion corresponding to one of the left and right ridge lines in the peak portion of the serrated portion and the position corresponding to the other ridge line separately, so that one ridge line formed in the previous stage and A paper saw blade with a sharp blade edge can be obtained by the other ridge line formed in the subsequent stage.
Moreover, it is only necessary to perform flat cutting or press cutting with a blade having a shape corresponding to one or the other of the left and right ridge lines in each peak portion of the serrated portion, and each blade can be easily manufactured. The aforementioned effects can be obtained while suppressing the manufacturing cost of the paper saw blade.

  In addition, when one ridge line is flattened, the other ridgeline is also flattened, and finally the connecting part is pressed, the intersection of one ridgeline and the other ridgeline is more stable without variation. In addition, since it is not a press-cut method, a paper saw blade with a sharp blade edge can be obtained more reliably.

  In addition, when a paper saw blade separated from the original fabric by a movable blade and a fixed blade is overlapped and welded to the carton by the movable blade, the paper saw blade punching operation is followed by the mounting operation to the carton. Can be performed continuously, and the processing time can be shortened.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 3 are schematic views conceptually showing an example of an apparatus for carrying out a two-stage punching method according to the present invention. Reference numeral 1 in the figure denotes a sheet-shaped paper saw blade, and in this example, a resin-cured paperboard or vulcanized fiber having a thickness of 0.35 to 0.25 mm or a moisture-proof processed product thereof is used. Yes. Reference numeral 2 denotes a nip roll, which is a feeding means for feeding the paper saw blade original fabric 1 to the die set mechanism 10 at a fixed pitch.

  Reference numeral 3 denotes a flat cutting blade for flat cutting in the die set mechanism 10, which is configured to be movable up and down and constitutes a front side flat cutting means with a fixed cradle 4. The flat punching means is provided with support means 5 that presses the flat punching blade 3 elastically against the receiving surface of the receiving table 4 from the vertical direction. A groove for protecting the cutting edge may be formed in the cradle 4 facing the flat punching blade 3, or a flexible material (not shown) may be attached.

Reference numeral 6 denotes a movable blade (upper blade) which is provided on the downstream side (rear stage side) of the flat punching blade 3 and can move up and down. The movable blade 6 is a fixed blade (lower blade) formed on the edge of the cradle 4. Corresponding to the blade 7), a rear side press-cutting means is constituted. The original fabric 1 is configured to be fed at a fixed pitch so as to protrude from the edge of the cradle 4 between the movable blade 6 and the fixed blade 7, and from the original fabric 1 supported in a cantilever shape, The paper saw blade 100 can be pressed from the edge of the fixed blade 7 by one reciprocating motion of the movable blade 6.
The downward movement of the movable blade 6 is performed simultaneously with the flat blade 3 by the die set mechanism 10, and the downward stroke of the flat blade 3 and the downward movement of the movable blade 6 are supported by the spring 5 a of the support means 5. It is designed to absorb stroke differences.

Reference numeral 100 denotes a paper saw blade as a product, and the paper saw blade 100 of this example includes saw-toothed portions 110 in which crest portions 101 and trough portions 102 are alternately connected, as shown in FIG. The part 102 is semicircular. This paper saw blade 100 is cut off from the original fabric 1 by a downward movement of the movable blade 6 with a size of, for example, 30 cm × 0.8 cm, and is placed on a predetermined position of a carton blank 8 which is a box material for storing a roll film. Is done.
The surface of the paper saw blade original fabric 1 is provided with a heat-soluble film such as polypropylene, and is movable through an ultrasonic welding device (horn) 9 as welding means provided at a position corresponding to the lower side of the movable blade 6. Subsequent to the pressing operation by the blade 6 and the fixed blade 7, the paper saw blade 100 is pressed against the carton blank 8 by the movable blade 6, and the welding operation to the carton blank 8 can be performed continuously and continuously.

The outline of the cutting edge shape of the flat punching blade 3 is shown in FIG. 4A, and the outline of the cutting edge shapes of the movable blade 6 and the fixed blade 7 are shown in FIG. 4B.
The flat punching blade 3 is provided with arcuate cutting edge portions 3a at predetermined intervals so that ridgelines 102 'at portions corresponding to every other trough portion 102 in the sawtooth portion 110 can be flattened. It is formed into a shape.
The movable blade 6 has an arcuate cutting edge portion so that the ridgeline 102 "of the valley portion 102 of the sawtooth portion 110 that is not flattened by the flat blanking blade 3 can be pressed together with the fixed blade 7. The movable blade 6 may be formed in a shape in which the arcuate blade edge portions 6a and the blade edge portions 3a are alternately connected.
The fixed blade 7 cuts the ridgeline 102 ″ together with the movable blade 6 and divides the outside of the ridgelines 102 ′ and 102 ″ flattened by the flat blanking blade 3 so that the paper saw blade 100 is made into a raw fabric. 1 is formed in a shape corresponding to the serrated portion 110 (a shape in which the crests 7a and the troughs 7b are alternately connected).

  The feed means 2 is designed so that the flat cutting blade 3 and the pedestal 4 perform the first flat cutting operation, and then the movable cutting blade 6 and the fixed blade 7 perform the second pressing operation. The paper saw blade original fabric 1 can be sequentially supplied at a constant pitch between the blade 3 and the cradle 4 and between the movable blade 6 and the fixed blade 7.

  The production of the paper saw blade 100 and the mounting operation to the carton by the production apparatus of the present example having the above configuration will be described. First, the paper saw blade original fabric 1 is connected to the flat punching blade 3 via the feeding means 2. Each trough of the sawtooth portion 110 of the paper saw blade 100 as the product in the raw material 1 for the paper saw blade supported by the cradle 4 by feeding the fixed pitch between the cradle 4 and lowering the flat cutting blade 3. The ridgeline 102 'corresponding to every other portion 102 is flattened (see FIGS. 1 and 4A), and then protrudes from the edge of the cradle 4 by the width of the paper saw blade 100 as the product. Then, the original fabric 1 is fed at a fixed pitch by the feeding means 2 (see FIG. 2).

  Next, in the previous stage, the movable blade 6 is pressed against the portion corresponding to the ridgeline 102 ″ where the flat cutting blade 3 has not been flattened, and is pressed (sheared) with the fixed blade 7, and the previous stage. The sawtooth portion 110 is formed by the ridgeline 102 ′ formed in the above and the ridgeline 102 ″ formed in the subsequent stage, and the paper saw blade 100 as a product is separated from the original fabric 1. When the movable blade 6 is further lowered, the obtained paper saw blade 100 is placed on a predetermined position of the carton blank 8, and the paper saw blade 100 is welded to the carton blank 8 via the ultrasonic welding device 9. At this time, the flat cutting blade 3 is lowered in the front flat cutting means, and the front flat cutting operation for the next paper saw blade 100 is performed (see FIG. 3).

  By sequentially repeating such operations, the paper saw blade 100 can be sequentially punched out of the raw fabric 1 in a two-stage manner, and the operation of sequentially mounting the paper saw blade 100 on the carton blank 8 can be performed continuously. Further, the obtained paper saw blade 100 is provided with a sharp blade edge (pointed tip 101a) formed by the intersection of the ridge line 102 ′ flattened in the previous stage and the ridge line 102 ″ cut in the subsequent stage. Yes, it is possible to obtain a carton with a paper saw blade capable of cutting the wrap films 200 reliably and quickly (see FIG. 5A).

  Even if there is a deviation between the ridgeline 102 ′ formed in the preceding stage and the ridgeline 102 ″ formed in the subsequent stage due to a shift in the feed pitch of the raw fabric 1, the point 101a of each peak 101a Just by shifting the height, it still has a sharp edge (tip 101a), and when the height of the tip 101a of each peak 101 is shifted, First, the high tip 101a ′ hits the wrap film and the wrap film 200 is supported in a tensioned manner between the adjacent high tips 101a ′ and 101a ′, and then the lower tip 101a ″ hits the wrap film 200. There is no hindrance to cutting (see FIG. 5B).

FIG. 6 shows a modified example of the flat punching blade 3, the movable blade 6, and the fixed blade 7. That is, in this example, as shown in FIG. 7A, each sawtooth portion 110 of the sawtooth portion 110 manufactures a paper saw blade 100 having a trapezoidal shape. In addition, the shapes of the trapezoidal blade edge portion 3a ′, the blade edge portion 6a ′, the peak portion 7a ′, and the valley portion 7b ′ are changed. Other configurations, operations, and effects are the same as those in the above-described embodiment, and thus redundant description and illustration are omitted.
As shown in FIG. 13A, when manufacturing a paper saw blade 100 in which each valley 102 of the sawtooth portion 110 is V-shaped, it is V-shaped according to the shape of each valley 102. Needless to say, the flat blade 3, the movable blade 6, and the fixed blade 7, which have been changed to V-shaped peaks and troughs, are used as the blade tips.

  Next, an example of an apparatus for carrying out the three-stage punching method according to the present invention will be described with reference to FIG. This apparatus has basically the same configuration as the apparatus shown in FIGS. 1 to 3, and the same components as those of the apparatus are denoted by the same reference numerals in the drawings, and redundant description and illustration are omitted. Only the differences are described below.

  That is, the apparatus of this example uses the above-described flat cutting blade 3 as the first flat cutting blade 3A having a shape corresponding to every other trough 102 in the serrated portion 110, and the flat cutting blade 3A. The above-described cradle 4 that presses 3A from the vertical direction constitutes the front-side flat punching means, and the flat-cutting blade 3A in each trough 102 of the serrated portion 110 is not flattened on the downstream side (rear stage). The second flat punching blade 3B having a shape corresponding to the portion and the cradle 4 that presses the flat punching blade 3B from the vertical direction constitute a rear-stage flat punching means, and further, the sawtooth portion The fixed blade 7 having a shape corresponding to 110 and the movable blade 6 having a male-female engagement relationship with the fixed blade 7 constitute a pressing means.

  Moreover, the apparatus of this example manufactures the paper saw blade 100 in which each trough part 102 in the serrated part 110 is semicircular, and the outline of the cutting edge shape of the first flat cutting blade 3 used here is shown in FIG. FIG. 9B shows an outline of the cutting edge shape of the second flat cutting blade 3B, and FIG. 9C shows an outline of the cutting edge shapes of the movable blade 6 and the fixed blade 7 respectively.

  The first flat cutting edge 3A flattenes the ridgeline 102 'at a location corresponding to every other valley 102 in the sawtooth portion 110, and at a predetermined location (in this example, a valley at the ridgeline 102'). 102 is provided with arcuate cutting edge portions 3a at predetermined intervals in such a shape that the connecting portion 130 can be left at the central portion 102). That is, it is formed in a shape having a gap 3a-1 for leaving the connecting portion 130 at the central portion of each blade edge portion 3a.

  The second flat cutting blade 3B flattenes the ridgeline 102 "of the valley portion 102 of the sawtooth portion 110 where the flat cutting blade 3A is not flattened, and a predetermined portion of the ridgeline 102" (this example Then, arc-shaped blade edge portions 3b are provided at predetermined intervals so that the connecting portions 131 can be left in the central portion of the valley portion 102). That is, it is formed in a shape having a gap 3b-1 for leaving the connecting portion 131 at the central portion of each blade edge portion 3b.

The movable blade 6 is formed in a shape having arcuate cutting edge portions 6a at predetermined intervals so that the connecting portions 130 and 131 can be pressed together with the fixed blade 7. The fixed blade 7 presses the connecting portions 130 and 131 together with the movable blade 6 and also cuts the outer sides of the ridges 102 'and 102 "flattened by the flat blades 3A and 3B to form a paper saw blade. A shape corresponding to the sawtooth portion 110 (a shape in which the crest portions 7a and the trough portions 7b are alternately connected) is formed so that 100 can be separated from the original fabric 1.
In addition, the movable blade 6 may be provided with a blade edge portion having a shape corresponding to only the portion corresponding to the connecting portions 130 and 131.

  The feed means 2 is subjected to the first flat cutting blade 3A and the front flattening operation by the cradle 4, and then the second flat cutting blade 3B and the second flat cutting operation by the cradle 4, and then, In order to perform the final pressing operation by the movable blade 6 and the fixed blade 7, between the flat punching blade 3A and the cradle 4 in the die set mechanism section 10, between the flat punching blade 3B and the cradle 4, the movable blade 6 The paper saw blade raw fabric 1 can be successively supplied at a constant pitch between the fixed blade 7 and the fixed blade 7.

  The production of the paper saw blade 100 and the mounting operation to the carton by the production apparatus of the present example having the above configuration will be described. A fixed pitch is fed between the blade 3A and the cradle 4 and the first flat cutting blade 3A is lowered, and the saw blade of the paper saw blade 100 as a product in the paper saw blade raw fabric 1 supported by the cradle 4 The ridgeline 102 'corresponding to every other valley portion 102 of the shape portion 110 is flattened, and then the raw material 1 is fed by the feeding means 2 on the cradle 4 by the width of the paper saw blade 100 as the product. Feeds a fixed pitch.

Next, in the previous stage, the second flat cutting blade 3B is lowered to a position corresponding to the ridge line 102 "where the flat cutting blade 3A has not been flattened, and the ridge line 102" is flattened. The sawtooth portion 110 is formed by the ridge line 102 ′ formed in step 1 and the ridge line 102 ″ formed in the subsequent stage.
At this time, the flat cutting blade 3A is lowered in the front flat cutting means, and the front flat cutting operation for the next paper saw blade 100 is performed.

Next, the raw fabric 1 is fed at a fixed pitch by the feed means 2 so as to protrude from the edge of the cradle 4 by the width of the paper saw blade 100 as the product, and then the portion that has not been flattened in each flattening step. The movable blade 6 is pressed against the joint portions 130 and 131 and is cut (sheared) with the fixed blade 7 to separate the product paper saw blade 100 from the original fabric 1. When the movable blade 6 is further lowered, the obtained paper saw blade 100 is placed on a predetermined position of the carton blank 8, and the paper saw blade 100 is welded to the carton blank 8 via the ultrasonic welding device 9.
At this time, the flat cutting blades 3A and 3B are moved down, and the front and rear flat cutting operations for the next paper saw blade 100 are performed.

  By sequentially repeating such operations, the paper saw blade 100 can be sequentially punched from the original fabric 1 in a three-stage manner, and the operation of sequentially mounting the paper saw blade 100 on the carton blank 8 can be performed continuously. Further, the obtained paper saw blade 100 has a sharper cutting edge (tip 101a) that is stably formed by the intersection of the ridgeline 102 'flattened in the front stage and the ridgeline 102 "flattened in the rear stage. Thus, a carton with a paper saw blade that can cut the wrap film 200 more reliably and quickly can be obtained.

  FIG. 10 shows a modified example of the flat blades 3A and 3B, the movable blade 6 and the fixed blade 7 described above. That is, in this example, the paper saw blade 100 in which each trough portion 102 of the serrated portion 110 is trapezoidal is manufactured, and the trapezoidal blade edge portions 3a ′ and 3b ′ are matched to the shape of each trough portion 102. The shapes of the cutting edge portion 6a ′, the crest portion 7a ′, and the trough portion 7b ′ are changed. Moreover, in each blade edge | tip part 3a ', 3b', the clearance gaps 3a'-1 and 3b'-1 for leaving the connection parts 130 and 131 are formed between the hypotenuse 102a and the base 102b of one side in the trough part 102, and it forms. Yes. Other configurations, operations, and effects are the same as those in the above-described embodiment, and thus redundant description and illustration are omitted.

11 and 12 show a modification of the first and second flat punching blades 3A and 3B in FIG.
In the example of FIG. 11, the cutting edge 3a ″ of the first flat cutting blade 3A has a shape corresponding to the hypotenuse 102a on one side in the same direction of each trough (crest) in the serrated portion 110, and the second The cutting edge 3b ″ of the flat cutting blade 3B has a shape corresponding to the oblique side 102c on one side in the same direction remaining in each of the valleys (peaks), and the bottom side as a connecting portion left by these flat cutting blades 3A and 3B 102 b is pressed by the movable blade 6 and the fixed blade 7. Other configurations, operations, and effects are the same as those in the above-described embodiment, and thus redundant description and illustration are omitted.

  In the example of FIG. 12, the cutting edge 3a ″ of the first flat cutting blade 3A has a shape corresponding to the hypotenuse 102a on one side in the same direction of each trough (crest) in the serrated portion 110, and the second The cutting edge 3b ″ of the flat punching blade 3B has a shape corresponding to the oblique side 102c and the bottom side 102b on one side in the same direction remaining in each of the valleys (peaks), and the joint portions left by these flat cutting blades 3A and 3B 130 and 131 are pressed by the movable blade 6 and the fixed blade 7. Other configurations, operations, and effects are the same as those in the above-described embodiment, and thus redundant description and illustration are omitted.

  Further, when manufacturing the paper saw blade 100 in which each trough portion 102 of the sawtooth portion 110 is V-shaped as shown in FIG. 13, the V-shaped cutting edge portion is matched to the shape of each trough portion 102. Needless to say, the flat punched blades 3A and 3B, the movable blades 6 and the fixed blade 7 changed to V-shaped peaks and valleys are used.

  FIG. 15A shows an enlarged photograph of the blade edge of a paper saw blade (VF blade) obtained by the conventional method, and FIG. 15B shows an enlarged photograph of the blade edge of the paper saw blade (VF blade) obtained by the present invention. Respectively. These photographs are taken 8 times with a microscope. From the comparison of both photographs, it was confirmed that the cutting edge of the paper saw blade (VF blade) obtained in the present invention was sharper than the cutting edge of the paper saw blade (VF blade) obtained by the conventional method.

  In the above-described embodiment, the form in which the movable blade and the fixed blade are used as the pressing process has been described. However, the blade for pressing is not limited to the movable blade and the fixed blade. For example, two movable blades are used. Any method that cuts with two blades from both sides of the original fabric can be implemented.

  The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the illustrated examples, and various modifications can be made within the scope of the technical idea described in each claim of the claims. It goes without saying that changes are possible.

It is the model which concerns on an example of the apparatus which implements the two-stage punching type manufacturing method of this invention, and shows the flat punching state of the front | former stage. The fixed pitch feed state after the front stage flat removal in FIG. 1 is shown. The state which mounts the paper saw blade after the back | latter stage cutting in FIG. 1 to a carton blank is shown. FIG. 2 is a plan view schematically showing a blade used for manufacturing a paper saw blade having a trough having a circular shape in FIG. 1, wherein (a) represents a flat blade, and (b) represents a movable blade and a fixed blade, respectively. FIGS. 1A and 1B are enlarged views of a paper saw blade having a trough having a circular shape, in which FIG. 1A shows a case where the blade edges are aligned, and FIG. 1B shows a case where the blade edges are uneven. FIG. 2 is a plan view schematically showing a blade used for manufacturing a paper saw blade having a trapezoidal trough portion in FIG. 1, where (a) represents a flat blade and (b) represents a movable blade and a fixed blade, respectively. FIGS. 1A and 1B are enlarged views of a paper saw blade having a trapezoidal trough, and FIG. 1A shows a case where the heights of the blade edges are aligned, and FIG. 1B shows a case where the heights of the blade edges are uneven. It is a schematic diagram which concerns on an example of the apparatus which implements the three-stage punching type manufacturing method of this invention, and shows the flat-out state of a back | latter stage. FIG. 9 is a plan view schematically showing a blade used for manufacturing a paper saw blade having a circular trough in FIG. 8, (a) is a front flat blade, (b) is a rear flat blade, (C) represents a movable blade and a fixed blade, respectively. FIG. 9 is a plan view schematically showing a blade used for manufacturing a paper saw blade having a trapezoidal trough portion in FIG. 8, (a) is a front flat blade, (b) is a rear flat blade, (C) represents a movable blade and a fixed blade, respectively. FIG. 9 is a plan view schematically showing a blade used for manufacturing a paper saw blade having a trapezoidal valley in FIG. 8, wherein (a) shows a front flat blade and (b) shows a rear flat blade. To express. FIG. 9 is a plan view schematically showing a blade used for manufacturing a paper saw blade having a trapezoidal valley in FIG. 8, wherein (a) shows a front flat blade and (b) shows a rear flat blade. To express. (A) is a plan view of a paper saw blade whose valley is V-shaped, and (b) is an enlarged view of the peak and valley. (A) is an enlarged view of the cutting edge of the paper saw blade (VF blade) obtained by the conventional method, and (b) is an enlarged view of the cutting edge of the paper saw blade (VF blade) obtained in the present invention. (A) shows an enlarged photograph of the blade edge of the paper saw blade (VF blade) obtained by the conventional method, and (b) an enlarged photograph of the blade edge of the paper saw blade (VF blade) obtained in the present invention.

Explanation of symbols

1: Raw material for paper saw blade 2: Nip roll (feeding means)
3, 3A, 3B: Flat cutting blade (flat cutting means)
4: Receiving base (flat punching means)
6: Movable blade (pressing means)
7: Fixed blade (pressing means)
8: Carton blank 9: Ultrasonic welding device (welding means)
DESCRIPTION OF SYMBOLS 100: Paper saw blade 110: Sawtooth part 101: Mountain part 101a: Tip 102: Valley part

Claims (11)

  A paper saw blade that is attached to a carton for storing wrapping films such as packaging films for packaging food, aluminum foil, cooking sheets, etc., and has a serrated portion in which crests and troughs are arranged alternately. A wrap film-storing carton paper saw blade characterized in that the shape of each crest of the ridge is 5% or less of the missing portion of the cusp with respect to an ideal shape having a pointed corner.   A method for manufacturing a paper saw blade having a sawtooth portion in which peaks and troughs are alternately connected using an original fabric for a paper saw blade, and at least left and right ridge lines in each peak portion of the sawtooth portion A portion corresponding to any one of the above and a portion corresponding to the other ridge line are punched in a separate process, and at the intersection of the one ridge line formed in the previous stage and the other ridge line formed in the subsequent stage, A method of manufacturing a multi-stage punching type paper saw blade, characterized by forming the tip of each peak.   After flattening a portion corresponding to one of the left and right ridge lines in each peak portion of the serrated portion with a flat cutting blade, the portion corresponding to the other ridge line is pressed with a movable blade and a fixed blade, At the intersection of one ridge line formed in the front flattening process and the other ridge line formed in the post-cutting process, a point of each peak in the serrated portion is formed, and in the post-cutting process in the post-stage 3. The method of manufacturing a paper saw blade according to claim 2, wherein the paper saw blade is separated from the original fabric by a two-stage punching type.   After the portion corresponding to one of the left and right ridge lines in each peak portion of the serrated portion is flattened with the first flat cutting blade, the remaining portion corresponding to the other ridge line is flattened with the second flat cutting blade. After that, the connecting part left in each flat cutting process is pressed with a movable blade and a fixed blade, and one ridge line formed in the previous flat cutting process and the subsequent flat cutting process are formed. 3. A three-stage punching type in which a point of each crest portion in the sawtooth portion is formed at an intersection with the other ridge line, and a paper saw blade is separated from the original fabric in a final pressing process. 2. A method for producing a paper saw blade according to 2.   One of the ridge lines formed by the front flattening is a portion corresponding to every other trough of the serrated portion, and the remaining trough that the other ridgeline formed by the subsequent flat cutting is not cut in the front stage The method for manufacturing a paper saw blade according to any one of claims 2 to 4, wherein the paper saw blade is a portion corresponding to.   One ridge line formed by the front flattening includes one oblique side in the same direction in each peak portion, and the other ridgeline formed by the subsequent flattening includes the one side oblique line in the same direction that is not cut in the previous stage. 5. The method of manufacturing a paper saw blade according to claim 4, further comprising a part of the bottom side connecting the hypotenuses of the adjacent crests, wherein the connecting portion to be cut in the final step of the cutting step is included.   A heat-soluble film is provided on the surface of the paper saw blade original fabric, and the paper saw blade separated from the original fabric is overlaid at a predetermined position in the carton, and the paper saw blade is disposed through the heat-soluble film. The method for manufacturing a paper saw blade according to any one of claims 3 to 6, further comprising a step of welding to the carton. An apparatus for manufacturing a paper saw blade having a sawtooth portion in which crests and troughs are alternately connected using a raw paper for a paper saw blade,
A front side flat punching means having a flat cutting blade having a shape corresponding to every other valley portion in the serrated portion, and a cradle for pressing the flat cutting blade from the vertical direction;
A rear-side pressing means having a movable blade having a shape corresponding to a portion not flattened by the flat blade in each valley portion of the serrated portion, and a fixed blade having a shape corresponding to the sawtooth portion;
A feeding means for feeding the original fabric at a fixed pitch from the front side flat punching means to the rear side pressing means;
The flat punching blade is pressed against a cradle that supports the original fabric, and portions corresponding to every other trough portion in the serrated portion of the original fabric are flattened, and then the original fabric is fed. Next, the movable blade is pressed against a portion that has not been flattened by the flat cutting blade in each trough portion of the serrated portion, and the movable blade is pressed by the fixed blade, and the front side flat blanking is performed. Forming a point of each crest in the sawtooth portion at the intersection of the ridge line formed by the means and the ridge line formed by the rear-side pressing means, and separating the paper saw blade from the original fabric Punching type paper saw blade manufacturing equipment. An apparatus for manufacturing a paper saw blade having a sawtooth portion in which crests and troughs are alternately connected using a raw paper for a paper saw blade,
A first-side flat punching means having a first flat punching blade having a shape corresponding to every other valley in the serrated portion, and a cradle for pressing the flat cutting blade from the vertical direction;
A second-stage flattening means having a second flattened blade having a shape corresponding to a portion not flattened by the flattened blade in each valley portion of the serrated portion, and a cradle for pressing the flattened blade from the vertical direction ,
A final cutting means having a fixed blade having a shape corresponding to the serrated portion and a movable blade having a male-female engagement relationship with the fixed blade;
A feed means for feeding the original fabric at a fixed pitch from the front-side flat punching means to the final-stage pressing means;
The first flat punching blade is pressed against a cradle that supports the original fabric, and portions corresponding to every other trough portion in the serrated portion of the original fabric are flattened, and then the original fabric Is fed at a fixed pitch by the feeding means,
Next, after flattening by pressing the second flat cutting blade against the portion that has not been flattened by the first flat cutting blade in each trough portion of the serrated portion, the original fabric is fed by a feeding means. Fixed pitch feed,
Further, the connecting part left by each flat punching means is pressed by the movable blade and the fixed blade,
At the intersection of the ridge line formed by the front side flat punching means and the ridge line formed by the rear side flat punching means, the peak of each crest in the sawtooth portion is formed, and the paper from the original fabric by the final cutting means. A three-stage punching type paper saw blade manufacturing apparatus characterized by separating the saw blade. An apparatus for manufacturing a paper saw blade having a sawtooth portion in which crests and troughs are alternately connected using a raw paper for a paper saw blade,
A front side flat punching means having a first flat cutting blade having a shape including a hypotenuse on one side in the same direction in each mountain portion, and a cradle for pressing the flat cutting blade from the vertical direction;
A second flat-cutting means having a second flat-cutting blade having a shape including a hypotenuse on one side in the same direction remaining in each of the peak portions;
A final cutting means having a fixed blade having a shape corresponding to the serrated portion and a movable blade having a male-female engagement relationship with the fixed blade;
A feed means for feeding the original fabric at a fixed pitch from the front-side flat punching means to the final-stage pressing means;
The first flat cutting blade is pressed against a cradle that supports the original fabric, and after flattening a portion including a hypotenuse on one side of each crest of the original fabric in the same direction, The raw material is fed at a fixed pitch by feeding means,
Next, after flattening a portion including the oblique side of one side in the same direction that has not been flattened by the first flat punching blade in each peak portion of the serrated portion with the second flat punching blade, The raw material is fed at a fixed pitch by feeding means,
Further, the connecting part left by each flat punching means is pressed by the movable blade and the fixed blade,
At the intersection of the one-side hypotenuse in the same direction formed by the front-stage flat punching means and the remaining one-side hypotenuse in the same direction formed by the rear-stage flat punching means, a point of each peak in the sawtooth portion is formed, and the final stage A three-stage punching type paper saw blade manufacturing apparatus characterized in that the paper saw blade is cut off from the original fabric by a pressing means.   As the paper saw blade original fabric, a raw fabric having a heat-soluble film provided on the surface thereof is used, and further provided with welding means for welding the paper saw blade at a predetermined position of the carton, and the press saw means uses the paper saw. The paper saw according to any one of claims 8 to 10, wherein the paper saw blade is separated from the original fabric, the paper saw blade is overlapped at a predetermined position of the carton, and the paper saw blade is welded to the carton by the welding means. Blade manufacturing equipment.