JP2007300904A - Drilling processing method for agricultural film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling processing method for agricultural films, capable of surely collecting unnecessary film pieces without unexpectedly tearing off during running films, unnecessary film pieces to be cut off. <P>SOLUTION: This drilling processing method for agricultural films comprises continuously drilling along the running direction of a running film 1 through irradiating laser beam LB to the running film 1, and scanning the laser beam LB so as to make a prescribed hole shape. In more details, the method comprises scanning the laser bean LB without letting a starting point and an end point of a process line formed on the film 1 coincide with each other so as to bring the interval between the starting point and the end point to ≤2 mm, and tearing off and removing unnecessary film pieces formed on the process line. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for punching a film for agriculture, and more particularly, an agriculture in which an unnecessary film piece to be cut can be reliably recovered without being unexpectedly broken during film traveling. The present invention relates to a method for punching a film.

  Some agricultural films such as multi-films have holes such as fixed planting holes, drain holes, and gas vent holes (Patent Document 1).

  Conventionally, a punching process for processing such a hole into a film is generally performed by mechanical punching using a processing blade having the same shape as the hole to be processed. However, in punching, the shape and size of the hole that can be processed is limited to that of the processing blade, so the shape and size of the hole cannot be changed freely, and it is difficult to process into a complicated shape, etc. Has drawbacks.

For this reason, this inventor is trying the method by the laser processing which makes a hole by irradiating a laser beam to a film. According to laser processing, the shape and size of the hole can be freely changed, and processing of a complicated shape is easy.
JP-A-10-98951 (points having vegetation holes in the film)

  When drilling by irradiating a film with a laser beam, in consideration of productivity, by irradiating the film traveling at a predetermined speed with a laser beam along the traveling direction of the film It is desirable to perform drilling continuously.

  Usually, laser processing is performed while scanning a laser beam so that a circle is formed on a film, for example, when making a round hole. At this time, as shown in FIG. 5, by matching the laser beam starting point 100 </ b> A and end point 100 </ b> B, a round hole is processed by cutting the film into a circular shape by the processing line 100 by the laser beam. Is ideal.

  However, since the laser beam is spot light having a diameter of μ order, it is difficult to scan the traveling film so that the starting point 100A and the ending point 100B of the laser beam completely coincide with each other. This is because even though the laser beam scanning mechanism itself can ensure the mechanical accuracy, the film being run is affected by the occurrence of film stretching, slipping and meandering during running, and film fluttering. This is probably because the processing line processed by the beam does not always draw the same locus on the film surface.

  For this reason, the film to be manufactured has a problem in which a film piece is cut out neatly and a round hole is opened, and a place where the film piece is barely connected without being cut out completely. . When a piece of film that remains connected without being cut off is generated, it is difficult to know when and at what stage it will be broken. Problems such as being entangled in the transport mechanism, adhering to the film main body as dust, or being scattered around are generated.

  Therefore, the present invention provides an agricultural film punching method that can reliably collect unnecessary film pieces without causing unnecessary film pieces to be cut off unexpectedly during film running. Is an issue.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

(Claim 1)
Aperture processing of agricultural film that continuously drills along the traveling direction of the film by irradiating the traveling film with a laser beam and scanning the laser beam so as to have a predetermined hole shape A method,
The laser beam is formed by the processing line after scanning so that the start point and end point of the processing line formed on the film do not coincide with each other and the distance between the starting point and end point is 2 mm or less. A method for perforating an agricultural film, characterized by tearing off and removing unnecessary film pieces.

(Claim 2)
The method for punching an agricultural film according to claim 1, wherein the laser beam is a laser beam by a CO ₂ gas laser having an output of 10 to 100 W.

(Claim 3)
The method for punching an agricultural film according to claim 1 or 2, wherein a scanning speed of the laser beam is 100 to 1000 mm / sec.

  According to the present invention, there is provided an agricultural film punching method capable of reliably collecting unnecessary film pieces without causing unnecessary film pieces to be cut off unexpectedly during film running. Can do.

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

  FIG. 1 is a schematic view for explaining a method for punching an agricultural film according to the present invention.

  In the figure, reference numeral 1 denotes a film, which travels at a predetermined speed from the right to the left in the drawing by a conveyance mechanism (not shown).

  A laser processing apparatus 2 irradiates the surface of the traveling film 1 with the laser beam LB, scans the laser beam LB so as to have a predetermined hole shape, and follows the traveling direction of the film 1. Process continuously.

  3 is an apparatus for removing a film piece processed by the laser processing apparatus 2, and is disposed downstream of the laser processing apparatus 2.

  In the present invention, when a predetermined hole is processed in the film 1 traveling by the laser processing apparatus 2, as shown in FIG. 2, the laser beam LB is scanned from the start point 11A to the end point 11B as shown in FIG. The starting point 11A and the end point 11B of the processing line 11 formed on the film 1 are not made to coincide with each other, and the processing line 11 is not crossed, and the laser beam LB is formed between the starting point 11A and the end point 11B. The laser beam LB is scanned so as to form an unirradiated portion 12 that is not irradiated.

  Thus, the film piece 13 cut by the processing line 11 remains connected to the film 1 by the unirradiated portion 12.

  The distance a between the start point 11A and the end point 11B of the scanning of the laser beam LB, that is, the distance of the connected state is set to 2 mm or less. When it becomes larger than 2 mm, it becomes difficult to tear off and open the film piece 13 in the removing device 3.

  For example, as shown in FIG. 3, a plurality of such processing lines 11 can be continuously formed along the traveling direction of the film 1.

  As described above, the present invention creates a state in which the film piece 13 is not surely cut off from the film 1 by laser processing alone by forming the unirradiated portion 12 in a predetermined range, and the film piece 13 is unexpectedly moved while traveling. Try not to tear off. As a result, in the subsequent removal device, the unnecessary film piece 13 can be reliably recovered, and the film piece 13 is unexpectedly broken during the running, entangled with the transport mechanism, scattered around, or attached to the film 1. There is no worry to do. That is, it is possible to achieve both the certainty of punching the film 1 and the certainty of collecting the unnecessary film piece 13.

  When the processing line 11 is processed by the laser beam LB, the scanning direction of the laser beam LB and the positions of the starting point and the ending point on the processing line 11 are not particularly limited.

  Further, the shape of the processing line 11 is exemplified in FIG. 2 in the case of processing a circular round hole, but only by appropriately changing the scanning mode of the laser beam LB according to the hole shape formed in the film 1. For example, a triangular shape, a rectangular shape, an elliptical shape, a star shape, and other polygonal shapes are arbitrary.

In the present invention, the laser beam LB is preferably a CO ₂ gas laser having an output of 10 to 100 W. The CO ₂ gas laser can efficiently extract the laser output, and the quality of the laser beam LB is high, so that the film 1 can be processed efficiently. Furthermore, if the output is too small, the film 1 is not easily cut, and if it is too large, it is difficult to obtain an effect commensurate with the power cost, such as the wavy cross section of the processing line 11.

  Further, when the processing line 11 is processed by the laser beam LB, the scanning speed is in the range of 100 to 1000 mm / sec because the cross section of the processing line 11 is wavy when it is slow, and the film 1 is poorly cut when it is fast. It is preferable.

  After the film piece 13 connected to the film 1 at the unirradiated portion 12 is processed by the laser processing device 2, the unnecessary film piece 3 is torn off and removed from the film body by the removing device 3 arranged downstream thereof. .

  As a method for tearing off the unnecessary film piece 13 by the removing device 3, any one of a method of mechanically tearing the film piece 13, a method of blowing away by air, or a method of tearing by suction can be adopted. It is not limited to these.

  In the above description, the number of tearing portions that are unirradiated portions 12 within a predetermined range is one, but the present invention is not limited to this and may be two or more.

  Moreover, in said aspect, although the distance of the state in which it was connected shall be 2 mm or less, a lower limit includes the case where a distance cut | disconnects completely and a distance is zero. In the present invention, it is preferable that they are in a slightly connected state.

  In the present invention, the usable film 1 is not particularly limited as long as it can be used for an agricultural film, but a polyolefin resin can be preferably used. Among them, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), metallocene-catalyzed linear low-density polyethylene (LLDPE: linear carbon number in the range of 2 to 8), and the like can be given.

  The film 1 may be added with various colorants (color pigments such as black, green, and white) and various stabilizers. Furthermore, not only a single layer film but also a multilayer film (a two-layer film composed of a white layer and a black layer) or a color arrangement film having a different color in the film width direction (for example, green, black, green, etc. in the width direction) may be used. .

  FIG. 4 shows another example of the processing method by the laser processing apparatus 2.

  In this case, by scanning the laser beam LB from the starting point 15A to the ending point 15B, the laser beam LB is scanned so that the starting point 15A and the ending point 15B of the processing line 15 formed on the film 1 intersect each other. To do.

  As a result, the processing line 15 always intersects at the intersection 15C, so that the film piece 13 can be surely cut off by laser processing. Therefore, if the collecting means for the film piece 13 is arranged below, the film piece 13 can be reliably collected without worrying that the unnecessary film piece 13 is entangled in the transport mechanism, scattered around the film, or attached to the film 1. be able to.

Schematic for demonstrating the punching method of the agricultural film which concerns on this invention The figure which shows the processing method with the laser processing equipment Plan view showing the film after laser processing The figure which shows the other example of the processing method by a laser processing apparatus The figure which shows the ideal processing method with the conventional laser processing equipment

Explanation of symbols

1: Film 11: Processing line 11A: Starting point 11B: Ending point 12: Unirradiated part 13: Film piece 2: Laser processing device 3: Removal device LB: Laser beam

Claims (3)

Aperture processing of agricultural film that continuously drills along the traveling direction of the film by irradiating the traveling film with a laser beam and scanning the laser beam so as to have a predetermined hole shape A method,
The laser beam is formed by the processing line after scanning so that the start point and end point of the processing line formed on the film do not coincide with each other and the distance between the starting point and end point is 2 mm or less. A method for perforating an agricultural film, characterized by tearing off and removing unnecessary film pieces. The method for punching an agricultural film according to claim 1, wherein the laser beam is a laser beam by a CO ₂ gas laser having an output of 10 to 100 W. The method for punching an agricultural film according to claim 1 or 2, wherein a scanning speed of the laser beam is 100 to 1000 mm / sec.

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