JP6140067B2 - Equipment for forming multiple microhole rows in a long plastic film - Google Patents

Description

  The present invention provides a plurality of micropore arrays in the longitudinal direction of a long plastic film so as to obtain a long plastic film that can be used to form a packaging plastic bag that can be opened at any longitudinal position. Relates to the forming device.

  As shown in FIG. 13, the packaging bag 100 for various foods, confectionery, etc. has a jagged portion 103 for opening in addition to the heat seal portion 101 in the longitudinal direction and the heat seal portions 102, 102 in the lateral direction. There is. Since the plastic film is easily torn from each of the acute valleys of the knurled portion 103, the knurled portion 103 functions as an easy opening means. However, since the jagged portion 103 can be formed only in the lateral direction, there is a problem that it cannot be opened at an arbitrary position in the longitudinal direction.

  It is also widely performed to form a notch at the end of a plastic film packaging container and to open the packaging container from the notch. However, in such a packaging container, since the opening position is limited to the notch, it cannot be opened at an arbitrary position.

  Recently, a packaging container has been proposed in which a large number of fine holes are provided in a plastic film so that the plastic film can be opened at an arbitrary position in the part having the fine holes. Since the tear strength is reduced at the portion with the micropores, the plastic film can be easily cut. For example, Japanese Patent Laid-Open No. 7-187224 (Patent Document 1) is a conductive ink obtained by adding a conductive material to a printing ink on at least one side of a transparent plastic film, and is free at a predetermined position on the plastic film. Disclosed is a method for producing an easy-open packaging material characterized by forming a shape line, subjecting the plastic film to an electron beam or electrical discharge treatment, and providing a hole or a half-cut line in the conductive ink portion. Yes. Although this method can form openings or half-cut lines according to the pattern of the conductive ink, there is a problem that it requires a printing process and a discharge process of the conductive ink, and the productivity is low.

  Japanese Patent Application Laid-Open No. 8-324587 (Patent Document 2) discloses a packaging material in which an aluminum foil is used as an intermediate layer, a base film is laminated on one side, and a heat-adhesive film is laminated on the other side. In the sealed packaging bag formed by heat-bonding the necessary peripheral edge so as to become a heat-adhesive film, at least the base film of the heat-bonding scheduled portion of the peripheral edge is provided with a fine hole in advance. An easy-open packaging bag is disclosed. For example, this easy-open packaging bag has a width of about 0.2 mm in diameter using a heating needle in the heat-bonding area of the sealed packaging bag after manufacturing a three-layer packaging material of polyester / aluminum foil / polyethylene. It is formed by forming a base film only so as to have a thickness of about 3 mm, and thermally bonding three sides of this packaging material. However, the process of making a hole using a heating needle is also troublesome and the productivity is low.

  Instead of the opening, half-cut line or hole described in Patent Documents 1 and 2, a packaging bag using a plastic film provided with a large number of micropores having an average diameter of several μm to several tens of μm at the end in the longitudinal direction Can also be considered. As an apparatus for forming a plurality of fine hole arrays extending in the longitudinal direction, Japanese Patent Laid-Open No. 2012-35479 (Patent Document 3) is arranged in the lateral direction of a plastic film 201 as shown in FIGS. Each of the perforating apparatuses 220 includes a perforating roll 221 in which a large number of hard particles having sharp corners adhere to the surface, and a surface smoothing roll 222 disposed at a position facing the perforating roll 221. And a device 220 for driving each perforating roll 221 includes a table 230 movable in the axial direction of the surface smoothing roll 222 and a carrier movable toward the surface smoothing roll 222 along the guide rail 232 of the table 230. 240, and a holder 250 that is supported by the carrier 240, supports the perforating roll 221 rotatably, and measures the load received by the surface smoothing roll 222. However, since the structure of the perforating apparatus 220 is complicated in the apparatus of Patent Document 1, there is a problem that the manufacturing cost of a plastic film having a plurality of longitudinal micropore areas increases.

Japanese Unexamined Patent Publication No. 7-187224 JP-A-8-324587 JP 2012-35479 A

  Accordingly, an object of the present invention is to provide an apparatus for easily and accurately manufacturing a plurality of microhole arrays extending in a longitudinal direction on a long plastic film.

  As a result of diligent research in view of the above object, the inventors of the present invention have used a device provided with a plurality of perforating means arranged at predetermined intervals in the transverse direction on the plastic film, and used a predetermined amount in the transverse direction on the plastic film. When a large number of fine holes are formed in a strip shape at intervals, each punching means can be made of plastic by providing each punching means with elastic means for pressing a punching roll and means for adjusting the elastic force of the elastic means. The inventors have discovered that the force for pressing the film can be made substantially the same, and have arrived at the present invention.

That is, the apparatus of the present invention for forming a plurality of fine hole rows extending in the longitudinal direction at a predetermined interval in the transverse direction with respect to the traveling direction of the long plastic film is transverse to the traveling direction of the plastic film. A guide rail and a surface smooth roll extending to the guide rail, and a plurality of perforating means provided movably on the guide rail,
Each punching means is fixed to the bracket, a holder movably supported by the guide rail, a bracket pivotally supported by the holder, a punching roll rotatably supported by the bracket, and the bracket. comprising a pressure sensor, and an elastic force adjustment means for holding the elastic means with being supported by the holder,
The elastic force adjusting means includes a support member fixed to the holder, a screw portion screwed into the support member, a cylindrical member fixed to the screw portion to accommodate the elastic means, and the screw portion. And an elastic part of the elastic means that presses the bracket via the pressure sensor by rotating the screw part to move the cylindrical member up and down. The power changes,
The perforated roll is in contact with the surface smoothing roll through the plastic film,
The perforated roll is composed of a metal roll body and a large number of hard particles having a Mohs hardness of 5 or more having sharp corners attached to the outer peripheral surface thereof, and the hard particles have an average particle diameter of 15 to 70 μm. ,
The center of rotation of the perforating roll is deviated from the pivot of the bracket in the direction of travel of the plastic film, so that the holder presses the perforating roll against the plastic film via the elastic means,
By adjusting the elastic force adjusting means according to the output of the pressure sensor, the pressing force exerted on the plastic film by the plurality of perforating rolls is made the same.

  The micro-hole array forming apparatus of the present invention includes a holder that is movably supported by a guide rail, a punching roll that is rotatably supported by a bracket that is pivotally supported by the holder, and a pressure sensor that is attached to the bracket via a pressure sensor. An elastic means that abuts and a means for adjusting the elastic force of the elastic means, and the holder presses the perforated roll eccentrically in the lateral direction through the elastic means against the plastic film, so that the output of the pressure sensor By adjusting the elastic force adjusting means, the pressing force exerted on the plastic film by the plurality of perforating rolls can be ensured to be the same. Moreover, since the holder for the fine hole array of the present invention can be fixed at a desired position on the guide rail, a fine hole array for any size packaging container can be easily formed.

It is a front view which shows the micro hole row | line | column formation apparatus of this invention. It is a side view showing a punching means. It is a fragmentary sectional front view which shows a piercing | piercing means. It is a rear view which shows a punching means. It is a front view which shows the holder of a punching means. It is an exploded view which shows the bracket of a punching means. It is a fragmentary top view which shows the elongate plastic film in which the several fine hole row | line was formed. It is an enlarged plan view which shows the strip formed by slitting a long plastic film along the fine hole array. It is a top view which shows a bending strip. It is an enlarged plan view which shows the cylindrical bag which forms a heat seal part so that it may overlap with a micro hole row | line | column. It is a side view which shows a mode that a cylindrical bag is filled with the contents. It is a top view which shows the packaging bag containing the contents. It is a top view which shows an example of the conventional packaging bag. 10 is a plan view showing a punching device of Patent Document 3. FIG. 10 is a side view showing a punching device of Patent Document 3. FIG.

[1] Micro-hole array forming apparatus As shown in FIG. 1, a micro-hole array forming apparatus of the present invention includes a guide rail 1 extending in the horizontal direction and a plurality of punching means movably provided on the guide rail 1 2 and a surface smoothing roll 3 extending in parallel with the guide rail 1 so as to face the plurality of punching means 2. The guide rail 1 is composed of a pair of upper and lower rail members 1a and 1b fixed to the frame 10.

  As shown in FIGS. 2 to 4, each punching means 2 includes a holder 21 movably supported on the guide rail 1, a bracket 26 pivotally supported on the holder 21 via a pin 25, and a bracket. A perforating roll 28 fixed to a shaft 27 rotatably supported by 26, an elastic means 32 supported by the holder 21 and abutting the bracket 26 via a pressure sensor 30, and an elastic force of the elastic means 32. Means 34 for adjusting. The perforating roll 28 is pressed against the surface smooth roll 3 through the plastic film P. The surface smooth roll 3 is a driving roll, and the perforating roll 28 is a driven roll.

  The holder 21 includes a holder main body portion 21a and a holder pressing portion 21b, and is provided with semicircular concave portions 22a, 23a and 22b, 23b that form a circular cross section by combination in a pair of upper and lower positions corresponding to both. The holder main body portion 21a and the holder pressing portion 21b are fixed by a plurality of screws 24, 24.

  As shown in FIG. 5, a pair of vertical plate members 121a and 121b opposed to the left and right are integrally provided at the lower end of the holder main body portion 21a, and an opening 122a of each vertical plate member 121a and 121b. , 122b, the pivot pin 25 is fixed. As shown in FIG. 6, the bracket 26 pivotally supported by the pivot pin 25 includes a horizontal member 26a having an opening 126 at the rear end portion, and a pair of vertical plates fixed to the horizontal member 26a by bolts. Each of the vertical plate-like members 26b is provided with an opening 128.

  A perforating roll 28 is rotatably supported by a shaft 27 fixed to the openings 128 and 128 of the vertical plate members 26b and 26b of the bracket 26 via a roll bearing 27a. The perforated roll 28 includes a metal roll main body 28a and a large number of hard particles 28b having a Mohs hardness of 5 or more having sharp corners attached to the outer peripheral surface of the metal roll main body 28a. The hard particles 28a are preferably diamond fine particles. The diamond fine particles are preferably attached to the surface of the metal roll body 28a by nickel plating or the like. The average particle diameter of the hard particles 28b can be appropriately determined according to the thickness of the plastic film P that forms the fine holes. For example, when forming micropores for imparting easy tearability to a 12 μm thick plastic film P, the average particle size of the hard particles is preferably about 15 to 70 μm. The ratio (area ratio) of the hard particles 28b on the outer peripheral surface of the metal roll main body 28a is generally about 10 to 50%, preferably about 15 to 30%.

  An upper surface 129 of the horizontal member 26a of the bracket 26 is in contact with the elastic means 32 via the pressure sensor 30. Since the pressing force of the holder 21 is transmitted to the perforating roll 28 via the elastic means 32, the elastic means 32 is not limited as long as it can absorb excessive pressing force, but a coil spring as shown in the figure. preferable. Hereinafter, the coil spring will be described as an example. The coil spring 32 is housed in a cylindrical member 35 whose lower end is open. The upper end of the coil spring 32 is in contact with the inner surface of the upper wall of the cylindrical member 35, and the lower end is in contact with the pin member 36. The pin member 36 is in contact with the pressure sensor 30. The elastic force adjusting means 34 includes a screw part 34a screwed into a support member 37 fixed to the holder main body part 21a, a knob part 34b provided at the upper end, and a pin part 34c provided at the lower end. The pin portion 34c is fixed to the upper wall of the cylindrical member 35.

  When the knob portion 34b is turned, the elastic force adjusting means 34 is moved up and down by the rotation of the screw portion 34a, and the cylindrical member 35 fixed to the pin portion 34c is moved up and down accordingly. Since the upper end of the coil spring 32 is in contact with the inner surface of the upper wall of the cylindrical member 35, the length of the coil spring 32 changes depending on the upper and lower sides of the cylindrical member 35, and the elastic force also changes. Since there are tolerances in the parts constituting the punching means 2, the pressing force exerted on the plastic film P by the punching rolls 28 in the plurality of punching means 2 fixed to the guide rail 1 is not constant. Since the plastic film P to be perforated is as thin as about 10 to 50 μm excluding the sealant layer (about 20 to 70 μm), the pressing force exerted by the perforating roll 28 on the plastic film P must be very uniform. Therefore, it is necessary to finely adjust the elastic force of the coil spring 32 by the elastic force adjusting means 34 so that the pressing force of all the punching rolls 28 is the same.

[2] Plastic film As the plastic film P forming the micropore array, use a film made of polyesters such as polyethylene terephthalate (PET), polyolefins such as polypropylene and polyethylene, nylon, polyvinyl chloride, polyvinylidene chloride, etc. Can do. Among these, a PET film is preferable from the viewpoints of strength, gas barrier properties, printability, and cost. The thickness of the PET film may be 10-30 μm. In order to form in a packaging container, the laminated film which has the sealant layer which provides heat sealability is preferable. The sealant layer can be formed of low density polyethylene, ethylene-vinyl acetate copolymer or the like. The thickness of the sealant layer may be about 20 to 70 μm.

[3] Microhole array forming method As shown in FIG. 2, a pair of rail members 1a, 1b is inserted into a pair of upper and lower circular openings formed by the holder body 21a and the holder pressing portion 21b, and a plurality of screws 24, 24 By firmly fixing the holder main body portion 21a and the holder pressing portion 21b by the above, each punching means 2 is fixed to the guide rail 1 at a predetermined lateral direction position. When the plastic film P is passed between the perforating roll 28 and the surface smoothing roll 3 of the perforating means 2 and the surface smoothing roll 3 is rotated by an external driving means (not shown), the perforating roll 28 is also moved according to the movement of the plastic film P. Rotate.

  In this state, fine holes are formed in the plastic film P. However, since the pressing force of the individual perforating rolls 28 is not constant, the size and depth of the fine holes in the individual fine hole rows are different. In order to eliminate such variation, adjustment is performed so that the pressing force of all the perforating rolls 28 is kept constant at a desired level. For this purpose, the knob portion 34b of the elastic force adjusting means 34 is turned in order to set the pressing force of each punch roll 28 obtained from the output of the pressure sensor 30 to a predetermined value. In the example shown in the figure, the knob portion 34b of the elastic force adjusting means 34 is manually turned, but of course, it may be turned automatically. A plastic film P having a microhole array formed after the pressing force of all the perforating rolls 28 reaches a predetermined level is used as a product. As will be described later, since the microhole array is heat-sealed leaving only a part of the outside, a part of the microholes formed in the plastic film P may be a through hole.

  As shown in FIG. 7, the plastic film P on which the plurality of microhole rows 40 are formed is slit along the center line L1 of each microhole row 40 to obtain the strips 42 shown in FIG. Each strip 42 has a micro-hole array 40 'having a width half that of the original micro-hole array 40 at both ends. As shown in FIG. 8, it is bent in half along the center line L2 of each strip 42 to obtain a folded strip 42 'shown in FIG. As shown in FIG. 10, the side of the fine hole array 40 ′ of the bent strip 42 ′ is heat sealed to obtain a cylindrical bag 44. Since the heat seal portion 46 is located on the inner side by a slight distance from the side edge of the bent strip piece 42 ′, the fine hole array 40 ′ remains outside the heat seal portion 46. Further, since the heat seal portion 46 has a width that sufficiently covers the inner end of the fine hole row 40 ′, the inner end of the fine hole row 40 ′ does not protrude from the inner end of the heat seal portion 46. Therefore, even if there is a fine hole penetrating the plastic film P, it is completely sealed by heat sealing, so there is no problem. In this manner, a cylindrical bag 47 in which the heat seal part 46 having the fine hole array 40 'only on the outside is formed.

  As shown in FIG. 11, after the heat seal portion 48 is provided at a position below the opening end of the cylindrical bag 47 by a predetermined distance, the cylindrical bag 47 is filled with contents 50 such as confectionery from the opening end. To do. Finally, as shown in FIG. 12, after filling the contents 50, a heat seal portion 49 is formed in the vicinity of the opening end, and when the lower heat seal portion 48 is cut below, a packaging bag 51 containing the contents 50 is contained. Is obtained.

1 ... Guide rail
1a, 1b ... Rail members
2 ... Perforation means
3 ... Smooth surface roll
21 ... Holder
21a: Holder body
21b ・ ・ ・ Holder pressing part
22a, 22b ... Semicircular recess in the holder body
23a, 23b: Semicircular recess in the holder pressing part
24 ... Screw
25 ... Pivoting pin
26 ... Bracket
26a ・ ・ ・ Horizontal member of bracket
26b, 26b ... Vertical plate-like member fixed to the horizontal member
126 ... Opening of horizontal member of bracket
128 ... Opening of vertical plate member of bracket
27 ... Shaft
28 ... Perforating roll
28a ・ ・ ・ Metal roll body of perforated roll
28b ・ ・ ・ Hard particles of perforated roll
30 ... Pressure sensor
32 ... Elastic means (coil spring)
34. Elastic force adjusting means
34a: Screw part of the elastic force adjusting means
34b ... Knob of elastic force adjusting means
34c: Pin portion of elastic force adjusting means
35 ・ ・ ・ Cylindrical member
36 ・ ・ ・ Pin member
37 ... Support member
40 ... Micro hole array
40 '・ ・ ・ Partition of fine holes
42... Strip having fine hole array
42 '・ ・ ・ Strip with fine hole rows folded in the longitudinal direction
44 ・ ・ ・ Cylindrical bag
46 ・ ・ ・ Heat seal part in the longitudinal direction
47 ・ ・ ・ Cylindrical bag with heat seal in the longitudinal and transverse directions
48 ・ ・ ・ Heat seal part in the transverse direction
49 ... Transverse heat seal that seals the open end
50 ... Contents of the packaging container
51 ・ ・ ・ Packing bag with contents
P ... Plastic film

Claims (1)

An apparatus for forming a plurality of fine hole arrays extending in a longitudinal direction at a predetermined interval in a lateral direction with respect to a traveling direction of a long plastic film, and extending in a lateral direction with respect to the traveling direction of the plastic film A guide rail and a surface smoothing roll, and a plurality of perforating means movably provided on the guide rail,
Each punching means is fixed to the bracket, a holder movably supported by the guide rail, a bracket pivotally supported by the holder, a punching roll rotatably supported by the bracket, and the bracket. comprising a pressure sensor, and an elastic force adjustment means for holding the elastic means with being supported by the holder,
The elastic force adjusting means includes a support member fixed to the holder, a screw portion screwed into the support member, a cylindrical member fixed to the screw portion to accommodate the elastic means, and the screw portion. And an elastic part of the elastic means that presses the bracket via the pressure sensor by rotating the screw part to move the cylindrical member up and down. The power changes,
The perforated roll is in contact with the surface smoothing roll through the plastic film,
The perforated roll is composed of a metal roll body and a large number of hard particles having a Mohs hardness of 5 or more having sharp corners attached to the outer peripheral surface thereof, and the hard particles have an average particle diameter of 15 to 70 μm. ,
The center of rotation of the perforating roll is deviated from the pivot of the bracket in the direction of travel of the plastic film, so that the holder presses the perforating roll against the plastic film via the elastic means,
The apparatus characterized in that the pressing force exerted on the plastic film by the plurality of perforating rolls is made the same by adjusting the elastic force adjusting means according to the output of the pressure sensor.

Images