JP7096719B2 - Film cutting method and cutting equipment - Google Patents

Description

The present invention relates to a film cutting method and a cutting device.

Conventionally, when a packaging bag or the like is manufactured from a film, the process of cutting the film to be conveyed along the conveying direction, the process of processing the shape of the periphery of the packaging bag or the shape of a hole, etc. by punching, etc., intersects the conveying direction. A process of cutting individual packaging bags along the direction is performed. Among them, regarding the punching process, Patent Document 1 describes a punching means including a driven male mold portion and a fixed female mold portion, and capable of sucking punching residue from the distance between the female mold blocks. Is described.

Japanese Patent No. 5784872

When the film is three-dimensionally molded so as to have a molded portion composed of concave portions or convex portions, there is a problem that the molded portion is crushed when a conventional punching blade is used.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a film cutting method and a cutting device capable of making a cut without crushing a molded portion.

In order to solve the above problems, the present invention is a method for cutting a film having a molded portion composed of concave portions or convex portions to make a cut in the molded portion, wherein the blade for forming the cut and the blade are used. Receiving portions having slit-shaped grooves to be inserted are provided on both sides in the thickness direction of the film, and the blade is driven toward the grooves along the thickness direction of the film to press the film. By using a cutting device for making the cut, the molding portion is a place where an accessory part is welded to the film to be processed into the packaging bag, and the cut does not include a closed figure on the film. The receiving portion is formed, and the receiving portion protrudes to the side on which the film is arranged, and a protruding portion having a shape corresponding to the molded portion is provided around the groove portion, and the protruding portion is formed in the groove portion in the thickness direction of the blade. The distance A between the wall surface and the tip of the blade is within the range of 0.0 to 0.45 mm in the thickness direction of the blade, and the wall surface is provided on both sides of the blade. Provided is a method for cutting a film, wherein the distance B between the wall surface on the side opposite to the side where the distance A is set and the blade of the blade is equal to or larger than the thickness of the film.

Further, the present invention is a cutting device for making a cut in the molded portion of a film having a molded portion composed of a concave portion or a convex portion, and has a blade for forming the cut and a slit shape into which the blade is inserted. The receiving portions having the groove portions of the film are provided on both sides in the thickness direction of the film, and the cutting tool is driven toward the groove portions along the thickness direction of the film, and the film is pressed to press the cut. The molded portion is a portion where accessories are welded to the film processed into the packaging bag, and the cut is formed so as not to include a closed figure on the film, and the receiving portion is formed. Projects to the side where the film is arranged, and has a projecting portion having a shape corresponding to the molded portion around the groove portion, and the projecting portion has wall surfaces on both sides of the groove portion in the thickness direction of the blade. The distance A between the wall surface and the tip of the blade is within the range of 0.0 to 0.45 mm in the thickness direction of the blade, and the distance A is set in the thickness direction of the blade. Provided is a film cutting device characterized in that the distance B between the wall surface on the side opposite to the side to be sewn and the blade of the blade is equal to or larger than the thickness of the film.

In the above-mentioned cutting method and cutting device, the blade is a single-edged blade having an inclined surface on one side in the thickness direction, and the distance A is on the side opposite to the inclined surface in the thickness direction of the blade. The distance between the wall surface on the side to be arranged and the tip of the blade, or the blade is a double-edged blade having inclined surfaces on both sides in the thickness direction, and the distance A is the thickness of the blade. In the direction, it may be the distance between the wall surface on the side closer to the tip of the blade and the tip of the blade.

According to the present invention, it is possible to make a cut in the film without crushing the molded portion of the film.

It is sectional drawing of the film cutting method and the cutting apparatus using a single-edged blade. It is sectional drawing of the film cutting method and the cutting apparatus using the double-edged blade.

Hereinafter, the present invention will be described with reference to the drawings based on the preferred embodiments.

FIG. 1 illustrates an embodiment when a single-edged blade is used. The cross-sectional view shows a cut surface along a plane perpendicular to the longitudinal direction of the blade 10. The left and right sides of the figure correspond to the thickness direction of the blade 10, and the top and bottom of the figure correspond to the direction perpendicular to the thickness direction of the film.

The cutting device has a blade 10 as a male mold and a receiving portion 1 as a female mold. The receiving portion 1 has a slit-shaped groove portion 3 into which the blade 10 is inserted. The film (not shown) is arranged between the receiving portion 1 and the cutting tool 10. That is, the receiving portion 1 and the cutting tool 10 are arranged so as to face each other on both sides in the thickness direction of the film.

The cutting device of the present embodiment can make a cut in the molded portion when the film has a molded portion composed of concave portions or convex portions. The operation for making a cut in the film is to drive the blade 10 toward the groove 3 along the thickness direction of the film and press the film so that the tip 11 of the blade 10 comes into contact with the film to make a cut. It is a mode to put in. At this time, the shape of the cutting tool 10 with respect to the surface of the film is not particularly limited, but may be the same planar shape as the cut. The planar shape of the cut may be a non-closed figure such as a straight line or a polygonal line, or may be a closed figure such as a circle or a polygon.

The receiving portion 1 is provided with a protruding portion 2 projecting to the side on which the film is arranged around the groove portion 3. The protruding portion 2 has a surface 2a having a shape corresponding to the molded portion of the film. The protruding portion 2 has wall surfaces 4 and 5 on both sides of the groove portion 3 in the thickness direction of the cutting tool 10, respectively. These wall surfaces 4 and 5 are arranged along the driving direction of the blade 10. Further, the blade body 16 of the blade 10 has side surfaces 12 and 13 on both sides of the blade 10 in the thickness direction, respectively. The blade body 16 and the side surfaces 12 and 13 are portions that can be inserted into the groove portion 3. The blade 10 may include a portion that is not inserted into the groove portion 3, such as a support portion (not shown) that supports the blade body 16.

In order to make a cut in the film without crushing the molded portion of the film, it is preferable to appropriately set the positional relationship between the cutting tool 10 and the wall surfaces 4 and 5 of the groove portion 3. Specifically, the distance A between the wall surface 4 and the tip 11 of the blade 10 is within the range of 0.0 to 0.45 mm in the thickness direction of the blade 10. Further, in the thickness direction of the blade 10, the distance B between the wall surface 5 on the side opposite to the side where the distance A is set and the blade 16 of the blade 10 is equal to or larger than the film thickness. These distances A and B are defined as the distances in the thickness direction of the blade 10 with the wall surfaces 4 and 5 when the blade 10 is driven in the thickness direction of the film and inserted into the groove 3. This is to specify the distance when the distance is minimized.

As shown in FIG. 1, when the blade 10 is a single-edged blade having an inclined surface 14 on one side in the thickness direction, the distance A is the side opposite to the inclined surface 14 of the blade 10 in the thickness direction of the blade 10. It may be the distance between the wall surface 4 on the side arranged in the blade 10 and the tip 11 of the blade 10. In this case, the distance B may be the distance between the wall surface 5 on the side arranged on the same side as the inclined surface 14 of the blade 10 and the side surface 13 following the inclined surface 14 of the blade 10 in the thickness direction of the blade 10. ..

As shown in FIG. 2, the blade 20 may be a double-edged blade having inclined surfaces 24 and 25 on both sides in the thickness direction. In this case, the distance A may be the distance between the wall surfaces 4 and 5 on the side closer to the tip 21 of the blade 20 and the tip 21 of the blade 20 in the thickness direction of the blade 20. That is, even if the distance between one wall surface 4 of the groove 3 and the tip 21 of the cutting tool 20 or the distance between the other wall surface 5 of the groove 3 and the tip 21 of the cutting tool 20 is selected, whichever is smaller. good. In this case, the distance B is the distance between one wall surface 4 of the groove 3 and the side surface 22 of the blade body 26 facing the groove portion 3, or the other wall surface 5 of the groove portion 3 and the side surface of the blade body 26 facing the other wall surface 5. Of the distances from 23, the one with the larger distance may be selected.

If the distance between one wall surface 4 of the groove 3 and the tip 21 of the blade 20 is equal to the distance between the other wall 5 of the groove 3 and the tip 21 of the blade 20, whichever is selected as the distance A good. Further, the distance between one wall surface 4 of the groove portion 3 and the side surface 22 of the blade body 26 facing the groove portion 3 is equal to the distance between the other wall surface 5 of the groove portion 3 and the side surface 23 of the blade body 26 facing the groove portion 3. In that case, any of them may be selected as the distance B.

Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

As the film, a laminate having a sealant on at least one side, for example, a polyolefin resin layer such as polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), or cyclic polyolefin is used as the innermost layer (sealant). , Biaxially stretched nylon film, biaxially stretched polyethylene terephthalate film, biaxially stretched polypropylene film, and other stretched films as the base material, and if necessary, ethylene-vinyl alcohol copolymer, metal or inorganic compound vapor deposition layer, aluminum foil. A laminated film having a metal foil or the like as an intermediate layer can be used, but the present invention is not particularly limited thereto.

The molded portion of the film can be formed by, for example, heating the film within a range in which the film does not melt, and then stretching a part of the film by compressed air, vacuum, or the like. As a method for heating the film, a non-contact type that radiates infrared rays or the like can be adopted as well as a contact type that directly contacts the heater. The heating side may be from the inside of the film or from the outside of the film.

The cut may be a continuous line, or a plurality of line segments may be arranged vertically side by side via the joint portion like a perforation. It is preferable that the cut is formed so as not to include the closed figure on the film because it can prevent debris. Examples of the shape of the cut that does not include the closed figure include, but are not limited to, an I-shape, an L-shape, a V-shape, a T-shape, and an X-shape.

After making a cut in the molded portion of the film, accessories such as a spout and a tube may be welded to the molded portion of the film. Further, after that, the film may be processed into a product such as a packaging bag. After joining the accessory parts to the molded part having a cut, when the film is processed into a product, if the film is cut so as to be connected to the cut part, the interference of the accessory parts is suppressed during the cutting work, and the workability is improved. improves.

Next, the procedure of the bag making method using the above-mentioned cutting method will be illustrated.
(1) Using the above-mentioned cutting method, make a cut that does not reach the edge in the width direction of the film at the position where the accessory part set on the film is mounted.
(2) Attach accessories such as spouts so that they intersect the cuts on the film.
(3) The inner surfaces of the laminated films are sealed to each other to form a sealing portion at a position that becomes the peripheral edge of the bag body. Part or all of this sealing process can also be performed in parallel with the process of mounting the accessories.
(4) The film is cut so as to be connected to the cut, and the bags are separated from each other.

The bag making machine provided with the above-mentioned cutting device may carry out the above-mentioned bag making method while conveying the film by the conveying means. As a means for mounting the accessory parts, a parts feeder, a sealer and the like can be mentioned. When attaching the accessory parts, the accessory parts may be temporarily fixed to the film by a point sealing device or the like prior to the final fixing.

The above-mentioned cutting device is not limited to the bag making machine, the packaging machine and the like, and may be combined with various film processing devices. As a means for forming a seal portion on the film, one type or two or more types such as a seal bar, a seal roll, and a seal mold can be mentioned. As a means for cutting the film, one kind or two or more kinds such as a slitter, a guillotine cutter, and a Thomson blade can be mentioned. Processing means such as film sealing means and cutting means are different depending on whether the processing is in the vertical direction along the transport direction of the film, in the horizontal direction intersecting the transport direction, targeting a smaller area, or the like. May be used.

Hereinafter, the present invention will be specifically described with reference to Examples.

A molded portion was provided on a film having a layer thickness of 0.185 mm, and after making a cut using a single-edged or double-edged blade, it was visually confirmed whether or not the molded portion was crushed. The positional relationship between the blade and the wall surfaces on both sides of the groove was changed as shown in Table 1 at distance A and distance B. The result was "○" when the molded portion was not crushed when the cut was provided, and "x" when the molded portion was crushed.

When the distance A was in the range of 0.0 to 0.45 mm and the distance B was equal to or larger than the thickness of the film, the film could be cut without crushing the molded portion.

1 ... Receiving part, 2 ... Protruding part, 2a ... Surface of protruding part, 3 ... Groove part, 4, 5 ... Wall surface, 10, 20 ... Blade, 11,21 ... Blade tip, 12, 13, 22, 23 ... Blade Sides of the body, 14, 24, 25 ... inclined surfaces, 16, 26 ... blades.

Claims (4)

A cutting method for making a cut in the molded portion of a film having a molded portion composed of a concave portion or a convex portion.
A blade for forming the cut and a receiving portion having a slit-shaped groove into which the blade is inserted are provided on both sides in the thickness direction of the film, and the blade is provided along the thickness direction of the film. Using a cutting device that makes the cut by driving toward the groove and pressing the film.
The molded part is a place where an accessory part is welded to a film processed into a packaging bag.
The cut is formed so as not to include a closed figure on the film.
The receiving portion protrudes to the side on which the film is arranged, and a protruding portion having a shape corresponding to the molded portion is provided around the groove portion.
The protrusion has wall surfaces on both sides of the groove in the thickness direction of the blade.
In the thickness direction of the blade, the distance A between the wall surface and the tip of the blade is within the range of 0.0 to 0.45 mm.
A film characterized in that the distance B between the wall surface on the side opposite to the side where the distance A is set and the blade body of the blade is equal to or larger than the thickness of the film in the thickness direction of the blade. How to cut. The blade is a single-edged blade having an inclined surface on one side in the thickness direction, and the distance A is a wall surface on the side opposite to the inclined surface in the thickness direction of the blade and the blade. It is the distance from the tip of
or,
The blade is a double-edged blade having inclined surfaces on both sides in the thickness direction, and the distance A is the distance between the wall surface on the side closer to the tip of the blade and the tip of the blade in the thickness direction of the blade. The film cutting method according to claim 1, wherein the film is cut. A cutting device for making a cut in a molded portion of a film having a molded portion composed of a concave portion or a convex portion.
A blade for forming the cut and a receiving portion having a slit-shaped groove into which the blade is inserted are provided on both sides in the thickness direction of the film, and the blade is provided along the thickness direction of the film. The cut can be made by driving toward the groove and pressing the film.
The molded part is a place where an accessory part is welded to a film processed into a packaging bag.
The cut is formed so as not to include a closed figure on the film.
The receiving portion protrudes to the side on which the film is arranged, and a protruding portion having a shape corresponding to the molded portion is provided around the groove portion.
The protrusion has wall surfaces on both sides of the groove in the thickness direction of the blade.
In the thickness direction of the blade, the distance A between the wall surface and the tip of the blade is within the range of 0.0 to 0.45 mm.
A film characterized in that the distance B between the wall surface on the side opposite to the side where the distance A is set and the blade body of the blade is equal to or larger than the thickness of the film in the thickness direction of the blade. Cutting device. The blade is a single-edged blade having an inclined surface on one side in the thickness direction, and the distance A is a wall surface on the side opposite to the inclined surface in the thickness direction of the blade and the blade. It is the distance from the tip of
or,
The blade is a double-edged blade having inclined surfaces on both sides in the thickness direction, and the distance A is the distance between the wall surface on the side closer to the tip of the blade and the tip of the blade in the thickness direction of the blade. The film cutting device according to claim 3, wherein the film is cut.

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