JP6040164B2 - Easy-cleavage forming device - Google Patents

Description

  The present invention relates to an apparatus for periodically and efficiently forming a plurality of oblique easy-cleavage portions on a long plastic film.

  Plastic packaging containers that require high airtightness, heat resistance, and strength, such as retort pouches, are films of high heat resistance and high strength resin such as polyethylene terephthalate, a highly airtight layer such as aluminum foil, and unstretched polyethylene. Or it consists of sealant layers, such as a polypropylene. In the case of a retort pouch, after heating with hot water or a microwave oven, it is opened and the contents are taken out. However, since the pouch has high strength, it is opened by hand even if a notch is formed on the side of the pouch. Is often difficult. In particular, the number of people with inadequate grip strength has increased due to aging, so it is often impossible to open with a notch alone, and scissors must be used.

  As a method for producing an easily cut laminated film packaging material, Japanese Patent Application Laid-Open No. 11-77872 discloses a sealant for a laminated film comprising a base film layer and a sealant layer having a thickness of 1/2 or more of the total thickness. A method of thinning a sealant layer by irradiating a laser beam from the layer side to form a continuous or intermittent half-cut separation line is disclosed. When an oblique half-cut separation line is formed on a retort pouch by this method, an oblique half-cut separation line must be formed after each retort pouch is manufactured, and there is a problem that efficiency is poor.

  Since stretched film is easy to avoid in the stretching direction, if the bag is formed so that the opening is parallel to the stretching direction and a notch is formed on one side adjacent to the opening, the film near the opening can be easily torn. Can do. However, such a method can be opened only in parallel with the opening. In beverages, liquid foods, and the like, a small opening is often preferable, so a container (bag) having an oblique opening is desired. In order to obtain a bag having an oblique opening portion, it is necessary to manufacture a long plastic film in which inclined easy-cleavage portions are periodically formed.

  Accordingly, an object of the present invention is to provide an apparatus for periodically and efficiently forming a plurality of oblique easy-cleavage portions on a long plastic film.

  As a result of diligent research in view of the above object, the present inventors have determined that (a) a plurality of marking members that move in the lateral direction and the vertical direction with respect to a plastic film that travels at a constant speed in a certain direction, the traveling direction of the plastic film (B) When both sets of engraved members are brought into sliding contact with the plastic film at a predetermined timing, multiple pairs of easy-cleavage portions, each pair of which are arranged in a C shape, are periodically formed. It was discovered that it was formed and the present invention was conceived.

That is, the apparatus of the present invention has a plurality of pairs of oblique easy-cleavage portions (each pair is composed of first and second oblique easy-cleavage portions arranged in a letter C shape) on a long plastic film. It is formed periodically,
(a) a guide roll that advances the plastic film at a constant speed;
(b) a plurality of first marking members slidably contacting the plastic film to form the first oblique easy-cleavage portion;
(c) a plurality of second marking members disposed on the downstream side of the first marking member and forming the second oblique easy-cleavage portion in sliding contact with the plastic film;
(d) a first linear motion guide device that supports the plurality of first marking members at regular intervals and reciprocates in the lateral direction of the plastic film;
(e) a second linear motion guide device that supports the plurality of second marking members at regular intervals and reciprocates in the transverse direction of the plastic film;
(f) a third linear motion guide device for moving the first linear motion guide device in a direction perpendicular to the plastic film;
(g) a fourth linear motion guide device for moving the second linear motion guide device in a direction perpendicular to the plastic film;
(h) (1) Only the first marking member moves in the lateral direction in contact with the plastic film, thereby forming the first easy-cleavage portion, and (2) Progress of the plastic film When the first easy-cleavage portion reaches the position of the second stamping member with respect to the direction, the second stamping member starts to slidably contact the plastic film, and (3) the first easy-cleavage portion is When the predetermined size is reached, the first marking member is separated from the plastic film, and (4) when the second easy-cleavage part is the same size as the first easy-cleavage part. Further, the second marking member is separated from the plastic film, and (5) the apparatus repeats a cycle consisting of separating the first and second marking members from the plastic film for a predetermined time. .

  The first example of the marking member is composed of a large number of hard particles having a sharp corner and a Mohs hardness of 5 or more.

  The 2nd example of the said marking member is comprised by the some parallel edge formed in the outer peripheral surface of a roll. You may provide a notch part periodically in the said edge.

  A platen member is disposed behind the plastic film, and the first and second marking members are pressed against the plastic film on the platen member, thereby forming the first and second easy-cleavage portions. It is preferable.

  The plurality of first marking members are fixed at equal intervals to one slide member that moves along the first linear motion guide device, and the plurality of second marking members are the second linear motion. It is preferable that they are fixed at equal intervals on one slide member that moves along the guide device.

  The longitudinal distance between the first marking member and the second marking member is preferably half the longitudinal length of the first and second easy-cleavage portions.

  It is preferable that a lateral direction interval between the adjacent first and second marking members is equal to a narrower interval between the first easy-cleavage part and the second easy-cleavage part.

  The apparatus of the present invention that periodically forms a plurality of pairs of diagonally easy-cleavage portions, each pair of which is arranged in a U-shape on a long plastic film, is (a) a plastic film that travels in a constant direction at a constant speed And (b) two sets of marking members that are separated in the direction of travel of the plastic film and move in the lateral direction and the vertical direction with respect to the plastic film, and (c) both sets of marking members at a predetermined timing. Since it has a structure that is slidably contacted with a plastic film, it is possible to accurately form a plurality of pairs of easy-cleavage portions having any inclination angle, size, and interval.

It is a perspective view which shows the easy-cleavage part forming apparatus of this invention. It is a side view which shows the easy-cleavage part forming apparatus of this invention. It is a top view which shows the easy-cleavage part forming apparatus of this invention. FIG. 3 is a sectional view taken along line AA in FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3 (a). FIG. 4 is an enlarged sectional view showing a part B of FIG. 3 (c). It is the schematic which shows the relationship between arrangement | positioning of a 1st and 2nd marking member, and an easy-cleavage part. It is a figure which shows an example of arrangement | positioning of an easy-cleavage part. It is a figure which shows another example of arrangement | positioning of an easy-cleavage part. It is the schematic which shows the principle of formation of an easy-cleavage part. It is the schematic which shows the relationship between the 1st arrangement state of a 1st and 2nd marking member, and an easy-cleavage part. It is the schematic which shows the relationship between the 2nd arrangement state of a 1st and 2nd marking member, and an easy-cleavage part. It is the schematic which shows the relationship between the 3rd arrangement state of the 1st and 2nd marking member, and an easy-cleavage part. It is the schematic which shows the relationship between the 4th arrangement state of a 1st and 2nd marking member, and an easy-cleavage part. It is the schematic which shows the relationship between the 5th arrangement state of a 1st and 2nd marking member, and an easy-cleavage part. FIG. 8 is a cross-sectional view showing an arrangement state of first and second marking members corresponding to FIG. 7 (a). FIG. 8 is a cross-sectional view showing an arrangement state of first and second marking members corresponding to FIG. 7 (b) and FIG. 7 (c). FIG. 8 is a cross-sectional view showing an arrangement state of first and second marking members corresponding to FIG. 7 (d). It is sectional drawing which shows the state which both the 1st and 2nd marking members separated from the plastic film. It is a top view which shows the detail of the 1st example of a marking member. FIG. 10 is a cross-sectional view taken along the line CC of FIG. It is sectional drawing which shows another example of the projection part used for the 1st example of a marking member. It is a top view which shows the detail of the 2nd example of a marking member. FIG. 13 is a sectional view taken along the line DD of FIG. It is sectional drawing which shows the detail of the edge used for the 2nd example of a marking member. It is a top view which shows in detail another example of the edge used for the 2nd example of a marking member. It is sectional drawing which shows in detail another example of the edge used for the 2nd example of a marking member. It is the schematic which shows another example of the 1st and 2nd linear motion guide used for the easy-cleavage part forming apparatus of this invention. It is a figure which shows the process of forming a packaging bag from the plastic film in which the easy-cleavage part was formed.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, the present invention is not limited thereto, and various modifications may be made within the scope of the technical idea of the present invention. Although the distance between the first and second marking members in the longitudinal direction and the movement distance of the third and fourth linear motion guide devices are small, they are greatly illustrated for explanation.

  1 to 3 show an example of the easy-cleavage part forming apparatus of the present invention. This easy-cleavage part forming device includes (a) upper and lower guide rolls 11 and 12 wound so that a long plastic film 1 travels in a constant direction at a constant speed, and (b) is in sliding contact with the plastic film 1. A plurality of (four in the illustrated example) first marking members 21 forming the first oblique easy-cleavage portion 100a, and (c) on the downstream side (upward in the illustrated example) of the first marking member 21 A plurality of (four in the illustrated example) second marking members 22 arranged and slidably contacting the plastic film 1 to form a second oblique easy-cleavage portion 100b, and (d) a plurality of first marking members A first linear motion guide device 31 that supports 21 at a constant interval and moves in the transverse direction with respect to the plastic film 1, and (e) a plastic that supports a plurality of second marking members 22 at a constant interval. A second linear motion guide device 32 that moves in the transverse direction relative to the film 1, and (f) a first A third linear motion guide device 41 for moving the linear motion guide device 31 in the vertical direction relative to the plastic film 1, and (g) a second linear motion guide device 32 for moving in the vertical direction relative to the plastic film 1. And a fourth linear motion guide device. The easy-cleavage part forming apparatus further includes (h) a platen member 5 having a flat surface at a position behind the plastic film 1 and corresponding to the first and second marking members 21 and 22, and (i) the first and second And two linear motion guide devices 41 and 42 and a frame 6 for supporting the platen member 5.

  Each of the guide rolls 11 and 12 is a drive roll for controlling the traveling speed of the long plastic film 1, and is combined with another guide roll 11 'and 12' as shown in FIG. It is preferable to do this. The plastic film 1 is held by each pair of guide rolls 11, 11 ', and 12, 12'. It is preferable to adjust the tension applied to the plastic film 1 by controlling the rotation speed of the guide rolls 11 and 12. Further, since the flat front surface 5a of the platen member 5 is positioned slightly forward (so as to press the plastic film 1) from the straight line (tangent line) in contact with the pair of guide rolls 11 and 12, the plastic film 1 is always the platen member 5 It makes perfect contact with the front surface 5a. Thereby, the depth of the easy-cleavage part 100 of the plastic film 1 formed on the platen member 5 can be accurately controlled. Since the platen member 5 is always in contact with the plastic film 1, it is preferably formed of a low friction material such as Teflon (registered trademark).

  As shown in FIGS. 1 and 3 (c), the frame 6 includes a pair of horizontal frame portions 6a to which a table 7a is fixed, a pair of horizontal frame portions 6b to which a table 7b is fixed, a horizontal frame portion 6a, A plurality of vertical frame portions 6c for supporting 6b, and horizontal frame portions 6a and 6b and a frame portion 6d fixed to the vertical frame portion 6c so as to support the platen member 5 are provided. The third linear motion guide device 41 is supported by the table 7a, and the fourth linear motion guide device 42 is supported by the table 7b.

  In order to adjust the position of the platen member 5, the platen member 5 is fixed to a rectangular box-shaped frame body 5b. The horizontal frame portions 6a and 6b function as a guide for moving the frame body 5b horizontally. The screw member 16 to be screwed into the female screw portion (not shown) of the frame portion 6d has a round bar shape and is not threaded, and the tip portion of the screw member 16 passes through the opening of the frame body 5b. Yes. Since the stopper is fixed to the tip of the screw member 16, and the coil spring 17 is provided between the frame body 5b and the frame part 6d, the frame body 5b is always pressed forward and the screw It moves in the horizontal direction by the rotation of the handle 16a fixed to the rear end of the member 16. Therefore, the platen member 5 fixed to the frame body 5b moves in the direction perpendicular to the plastic film 1, and the plastic film 1 is in close contact with the flat front surface 5a of the platen member 5.

As shown in FIGS. 3 and 4, a plurality (four in the illustrated example) of first and second marking members 21 (21a) that form a plurality of pairs of oblique easy-cleavage portions 100a, 100b on the plastic film 1 , 21b, 21c, 21d), 22 (22a, 22b, 22c, 22d) are provided at regular intervals in the first and second linear motion guide devices 31, 32, respectively. As shown in FIGS. 3 (a) and 3 (b), the third linear motion guide device 41 includes a pair of guides 41a and 41a fixed to the upper surface of the table 7a fixed to the horizontal frame portion 6a. A table 41b provided on the table 7a so as to be able to move along the pair of guides 41a, 41a, a screw member 41c provided at the center of the table 7a so as to drive the table 41b, and a screw member 41c. consisting of the motor M ₁ Metropolitan. The fourth linear motion guide device 42 includes a pair of guides 42a and 42a fixed to the upper surface of the table 7b fixed to the horizontal frame portion 6b, and a table that can move along the pair of guides 42a and 42a. a table 42b provided on the 7b, the screw member 42c provided at the center of the table 7b to drive the table 42b, and a motor M ₂ Metropolitan coupled to the screw member 42c. The first and second linear motion guide devices 31 and 32 are driven by motors M ₃ and M ₄ .

When the screw member 41c by the driving of the motor M ₁ rotates, the table 41b guide 41a, (the direction perpendicular to the plastic film 1) to move horizontally along the 41a, is secured to the third linear motion guide device 41 The first linear motion guide device 31 also moves in the direction perpendicular to the plastic film 1. Also when the screw member 42c by the motor M ₂ rotates, the table 42b guide 42a, (in a direction perpendicular to the plastic film 1) horizontally along 42a moves, fixed to the fourth linear motion guide device 42 The second linear motion guide device 32 thus moved also moves in the vertical direction with respect to the plastic film 1. Thus, the first and third linear motion guide devices 31 and 41 and the second and fourth linear motion guide devices 32 and 42 function as so-called XY stages, respectively.

  A feature of the present invention is that the first and second linear motion guide devices 31 and 32 periodically approach the plastic film 1 at timing, and the marking members 21 and 22 that are in contact with the plastic film 1 are linear. By moving in the lateral direction along the motion guide devices 31 and 32, a plurality of pairs of easy-cleavage portions 100a and 100b inclined in a square shape are formed. Here, the “C shape” means that the pair of easy-cleavage portions 100a and 100b inclined in the opposite direction is a line object with respect to the central axis C between them. In the example shown in FIG. 4, since four pairs of easy-cleavage portions 100a and 100b are formed, the plastic film 1 is slit along three straight lines F, and the central axis C of each strip 101 becomes a fold.

In the strip 101 shown in FIG. 5 (a), the end of the narrower gap between the pair of easy-cleavage portions 100a and 100b is in the forward direction of the plastic film 1, and is folded along the central axis C to form a cylindrical shape. A strip 105 is obtained, but in the strip 101 ′ shown in FIG. 5 (b), the end of the narrower distance between the pair of easy-cleavage portions 100a and 100b is behind the plastic film 1 in the traveling direction, and the central axis Folded along C, a cylindrical strip 105 ′ is obtained. When cut in the vicinity of the overlapped easy-cleavage portions 100a and 100b, substantially the same bag is obtained from the tubular strip 105 and the tubular strip 105 ′. Thus, the term "form of the slanted roof", not necessarily a pair of easy cleavage 100a, narrower spacing G ₂ of the 100b in the forward traveling direction.

FIG. 6 shows the principle that the marking member 21 moving in the lateral direction while contacting the linearly progressing plastic film 1 forms an oblique easy-cleavage portion 100. When the plastic film 1 advances to y _{2 in the} longitudinal direction while the marking member 21 located at the position A of (x ₁ , y ₁ ) moves in the transverse direction to the position C of (x ₂ , y ₁ ), the marking member 21 The cut formed at (x ₁ , y ₁ ) at position A moves to position (x ₁ , y ₂ ) at position B. Therefore, the easy-cleavage part 100 is formed along the line segment BC. For example, if the marking member 21 is inclined by 45 ° and the lateral direction moving speed of the marking member 21 and the traveling speed of the plastic film 1 are the same, as shown in FIG. 100 is obtained.

The principle of forming the easy-cleavage portions 100a, 100b inclined in the shape of a letter C using the first and second marking members 21, 22 is shown in FIGS. 7 (a) to 7 (e) and FIG. 8 (a). Details will be described below with reference to FIG. As shown in FIG. 7 (a), the adjacent first marking members 21 are separated by G _{1 in the} lateral direction (the direction along the first linear motion guide device 31), and the adjacent second marking member 21 The marking member 22 is also separated by G _{1 in the} lateral direction (direction along the second linear motion guide device 32). Moreover, (the direction of the spacing along the first and second linear motion guide unit 31, 32) a first stamping member 21 and a second transverse distance of the stamping member 22 adjacent is G _2. The first and second marking members 21 and 22 move at the same speed in the opposite directions. 7 (a) to 7 (e), ● indicates that the marking members 21 and 22 are in contact with the plastic film 1, and ○ indicates that the marking members 21 and 22 are not in contact with the plastic film 1. Indicates the state.

First, in the first arrangement state shown in FIGS. 7 (a) and 8 (a), the lower first linear motion guide device 31 approaches the plastic film 1, and the first marking member 21 is attached to the plastic film 1. Although in contact, the upper second linear motion guide device 32 is separated from the plastic film 1, and the second marking member 22 is not in contact with the plastic film 1. As shown in FIG. 7 (b) and 8 (b), the first stamped member 21 is moved by a distance X ₁ while moving the plastic film 1 by a distance Y _1, formed by the first stamped member 21 end of the easy-cleavage, which is moves by a distance Y _1, easy-cleavage 100a which is inclined in the half of the length 'is obtained. At this point, the second linear motion guide device 32 approaches the plastic film 1, and the second marking member 22 contacts the plastic film 1.

As shown in FIG. 7 (c) and 8 (b), while moving further by a distance Y ₁ is a plastic film 1, first and second stamping members 21 and 22 by a distance X ₁ in opposite directions Moving. The length of the first easy-cleavage end that is further formed by stamping member 21 is moved by a distance Y _1, easy-cleavage 100a inclined length of half the resulting 'half is previously formed The inclined easy-cleavage portion 100a ′ that is linearly continuous and has an oblique easy-cleavage portion 100a having a predetermined length is obtained. At the same time, the ends of the easy-cleavage, which is formed by the second stamping member 22 also moves a distance Y _1, easy-cleavage 100b inclined half length 'is obtained. Since the oblique easy-cleavage portion 100a has reached a predetermined length, the first linear motion guide device 31 is separated from the plastic film 1, and the first marking member 21 does not contact the plastic film 1.

As shown in FIG. 7 (d) and FIG. 8 (c), while moving further by a distance Y ₁ is a plastic film 1, with a second stamping member 22 is moved by a distance X _1, newly formed end of the easy-cleavage is also moved by the distance Y _1, easy-cleavage 100b diagonal half length 'is obtained. The newly formed half-length oblique easy-cleavage portion 100b ′ is linearly connected to the previously formed half-length oblique easy-cleavage portion 100b ′. An easy-cleavage portion 100b is obtained. In this state, both the easy-cleavage parts 100a and 100b reach a predetermined length. Because easy-cleavage 100b is formed with a delay of longitudinal distance Y _1, the moving distance of the plastic film 1 in the formation is the case as well as 2Y ₁ YasuHiraki cleft 100a, the length of the easy-cleavage 100b And the position is always the same as the length and position of the easy-cleavage part 100a. As apparent from FIG. 7 (d), the longitudinal length of the first stamped member 21 longitudinal spacing Y ₁ between the second stamping member 22, the first and second easy-cleavage 100a, 100b Half of 2Y ₁ . When the inclination angle θ of the first and second easy-cleavage portions 100a and 100b is 45 °, X ₁ = Y ₁ .

Next, as shown in FIG. 8 (d), the second linear motion guide device 32 is also separated from the plastic film 1. In a state of being separated from the plastic film 1, the marking members 21 and 22 are in the initial positions shown in FIG. 7A in any of the linear motion guide devices 31 and 32 (however, the marking member 21 is not in contact with the plastic film 1). Return to. When the plastic film 1 is moved by a predetermined distance Y _2, as shown in FIG. 7 (e), the first linear motion guide device 31 is close to the plastic film 1 again, the first stamped member 21 is a plastic film 1 To come into contact. Thus, the first and second linear motion guide devices 31 and 32 repeat the approach and separation from the plastic film 1, and the first and second marking members 21 and 22 move in the lateral direction to cause the plastic film. By attaching recesses (scratches) to 1, it is possible to form a plurality of pairs of easy-cleavage portions 100 a and 100 b inclined in a letter C shape on the plastic film 1. Each easy-cleavage 100a, the longitudinal length of 100b is twice the longitudinal spacing Y ₁ of the first stamped member 21 and the second stamping member 22, the longitudinal pitch is Y _2.

Taking the first marking member 21 as an example, the structure of each marking member will be described. As shown in FIGS. 9 and 10, the first example of the marking member 21 is a support body fixed to a slide member 21a that is movable along a linear motion guide device 31 including a screw member 31a and a guide portion 31b. 21b, a protrusion 21c integrally formed at the center of the support 21b, a scratch 121 provided at the center of the upper surface of the protrusion 21c, and a groove 122 provided on both sides of the scratch 121. . The screw member 31a is driven by a motor M _3. Due to the grooves 122 on both sides of the scratch part 121, the outline of the scratch part 121 becomes sharp, and a beautiful easy-cleavage part 100 is obtained.

  The scratch part 121 is composed of a large number of hard particles having a Mohs hardness of 5 or more, for example, having sharp corners. As the hard particles, diamond fine particles are preferable. The diamond fine particles are attached to the surface of the metal protrusion 21c by nickel plating or the like. The average particle size of the hard particles is appropriately determined according to the thickness and layer configuration of the plastic film 1. For example, if the plastic film 1 is composed of a 15 μm thick polyethylene terephthalate (PET) layer, a 20 μm thick nylon layer, an aluminum foil, and a 40 μm thick polyethylene (sealant) layer, the PET layer and the nylon layer Since it is necessary to form sufficient cuts, it is preferable to determine the average particle size of the hard particles within a range of 30 to 200 μm so that scratches (recesses) can be formed to a depth close to 15 μm + 20 μm = 35 μm. The ratio (area ratio) of hard particles in the scratch part 121 is generally 10 to 50%, preferably 15 to 30%.

  The protrusion 21c is preferably inclined with respect to the axial direction of the linear motion guide device 31. The inclination angle θ is determined by the ratio of the traveling speed of the plastic film 1 and the lateral direction moving speed of the marking member 21, but the easy-cleavage portion 100 preferably extends at an angle of 45 ° to the corner of the packaging bag. The inclination angle θ is also preferably 45 °. The scratch part 121 is formed in a direction perpendicular to the inclination direction DD of the inclined protrusion 21c. Thereby, the width W of the scratch part 121 becomes the width of the easy-cleavage part 100. An elastic material (not shown) such as a rubber plate is interposed between the slide member 21a and the support 21b in order to prevent the pressure at which the scratch portion 121 contacts the plastic film 1 from becoming excessive. Is preferred.

  FIG. 11 shows an example in which the width of the groove 122 provided on both sides of the scratch part 121 is increased. By increasing the width of the groove part 122, the width W of the scratch part 121 (and hence the width of the easy-cleavage part 100) can be adjusted as appropriate.

  12 to 14 show a second example of the marking member 21. FIG. The marking member 21 includes a support 21b fixed to a slide member 21a that is movable along the linear motion guide device 31, a pair of struts 131 and 131 that integrally project from the center of the support 21b, A shaft 132 rotatably supported by the support columns 131, 131, a roll 133 fixed to the shaft 132, a ridge 134 provided at the center of the outer peripheral surface of the roll 133, and an upper surface of the ridge 134. A plurality of parallel edges 135. In order to make it easy for the edge 135 to bite into the plastic film 1, as shown in FIG. The edge 135 of the marking member 21 is obtained by first forming the ridge 134 on the surface (roll surface) of the metal roll 133 by grinding, and then forming a plurality of parallel grooves 137 on the upper surface of the ridge 134 by a grinder. . In the above example, the height of the edge 135 must be sufficient to make a cut to a depth of about 35 μm, and specifically, about 100 to 300 μm is preferable. In order for the edge 135 to have sufficient strength and hardness, the metal roll forming the marking member 21 is preferably formed of high-speed steel, tool steel, cemented carbide or the like.

FIG. 16 shows a third example of the marking member 21. This example is a modification of the second example. In this example, there is no protrusion 134, and the first groove 137 on both sides and the second groove 138 between the edges 135 are formed deeply. Since the depth D ₁ of the first groove 137 is greater than the depth D ₂ of the second groove 138, the height H of the edge 135 is D ₁ −D ₂ . Since the height H of the edge 135 corresponds to the depth of the easy-cleavage part 100 to be formed, it is determined according to the depth of the easy-cleavage part 100. For example, in the above example, the height H of the edge 135 is about 35 μm. Since the edge 135 bites into the plastic film 1 only to a depth of H due to the roll surface, the depth of the easy-cleavage portion 100 can be accurately controlled by using this marking member 21. It should be noted that an elastic material (not shown) such as a rubber plate is interposed between the slide member 21a and the support 21b in order to prevent the pressure at which the roll 133 contacts the plastic film 1 from being excessive. preferable.

As shown in FIG. 4, since the first and second stamped members 21, 22 each of the plurality of first and second linear motion guide devices 31 and 32 are arranged at equal intervals G _1, adjacent The same applies to the lateral direction spacing of one end of the easy-cleavage portions 100a, 100a formed by the first marking member 21 and the lateral spacing of one end of the easy-cleavage portions 100b, 100b formed by the adjacent second marking member 22. G ₁ . Moreover, transverse spacing G ₂ between the adjacent easy cleavage site 100a and YasuHiraki cleft 100b is the same as the transverse direction spacing between the first engraved member 21 and the second stamping member 22. Therefore, any distance can be easily set by appropriately setting the distance between the first marking members 21, the distance between the second marking members 22, and the distance between the first marking member 21 and the second marking member 22. It can also be formed at the cleavage portion 100. On the other hand, the amount of movement of the third and fourth linear motion guide devices 41 and 42 for moving the first and second linear motion guide devices 31 and 32 in the direction perpendicular to the plastic film 1 is that of the easy-cleavage portion 100. Since the depth is about several tens of μm, it may be about 1 mm at most, but of course not limited. As described above, since the movement amount of the first to fourth linear motion guide devices 31, 32, 41, and 42 can be arbitrarily set, the device of the present invention can be formed with easy-cleavage portions of any shape, size, and interval. It is extremely versatile.

As described above, the amount of movement of the marking members 21a, 21b, 21c, 21d along the first linear motion guide device 31 and the amount of movement of the marking members 22a, 22b, 22c, 22d along the second linear motion guide device 32 Therefore, all the marking members 21a to 21d and 22a to 22d may be fixed to one slide member 31 and 32, respectively. Figure 17 includes a first sliding member 23 in which four stamped member 21a~21d is fixed at a predetermined transverse spacing G _1, four marking member 22a~22d is fixed at a predetermined transverse spacing G ₁ The second slide member 24 is shown. Both sliding members 23 and 24, adjacent stamping member 21a, since transverse spacing 22a is arranged so that G _2, easy-cleavage 100a are disposed in the form of the slanted roof, 100b transverse spacing Will also be G ₂ . Since all engraved member 21a~21d and 22a~22d are fixed to one slide members 31 and 32, respectively, can be kept always constant transverse spacing G ₁ and G _2, easy-cleavage 100a, 100b The advantage of being able to accurately control the placement of the

  Since one side of the packaging bag is usually a fold, a pair of easy-cleavage portions 100a and 100b are provided on the side facing the fold. In the spread, the pair of easy-cleavage portions 100a and 100b are arranged in a square shape as shown in FIG. Therefore, the first marking members 21a to 21d on the first linear motion guide device 31 are arranged at a position corresponding to one end (the right end in FIG. 4) of the easy-cleavage portion 100a, and the second linear motion guide device 32 The second marking members 22a to 22d are arranged at a position corresponding to the other end (left end in FIG. 4) of the easy-cleavage portion 100b.

  When the long plastic film 1 is wound around the pair of guide rolls 11 and 12 so that the sealant layer is on the platen member 5 side, the front surface 5a of the platen member 5 slightly presses the plastic film 1 as shown in FIG. Therefore, the plastic film 1 is in perfect sliding contact with the front surface 5a of the platen member 5. In this state, the first and second marking members 21 and 22 are moved as shown in FIGS. 7 and 8 to form each pair of easy-cleavage portions 100a and 100b arranged in a square shape.

  When the plastic film 1 in which a plurality of pairs of easy-cleavage parts 100a and 100b are formed is slit along the straight line F and each obtained strip 101 is folded along the central axis C as shown in FIG. The easy-cleavage parts 100a and 100b completely overlap (step A). Next, heat sealing is performed in the longitudinal direction along the outer end 102 of the easy-cleavage part 100, and the side end part is cut off along the obtained heat sealing part 103 to form a flat cylindrical strip 105 (process B) ). Furthermore, the heat seal part 107 is formed along the transverse direction line 101a close to each easy-cleavage part 100, and the tubular strip 105 is cut into individual bags 109 (step C). After filling each bag 109 with the contents, the inlet is heat-sealed (the heat-seal part 111 is formed) to form a bag 113 containing the contents (step D). When the notch 115 is provided at a position in contact with the easy-cleavage part 100 of the heat seal part 111, the bag 113 can be easily opened along the easy-cleavage part 100.

Claims (8)

It is an apparatus that periodically forms a plurality of pairs of oblique easy-cleavage parts (each pair is composed of first and second oblique easy-cleavage parts arranged in a square shape) on a long plastic film. And
(a) a guide roll that advances the plastic film at a constant speed;
(b) a plurality of first marking members slidably contacting the plastic film to form the first oblique easy-cleavage portion;
(c) a plurality of second marking members disposed on the downstream side of the first marking member and forming the second oblique easy-cleavage portion in sliding contact with the plastic film;
(d) a first linear motion guide device that supports the plurality of first marking members at regular intervals and reciprocates in the lateral direction of the plastic film;
(e) a second linear motion guide device that supports the plurality of second marking members at regular intervals and reciprocates in the transverse direction of the plastic film;
(f) a third linear motion guide device for moving the first linear motion guide device in a direction perpendicular to the plastic film;
(g) a fourth linear motion guide device for moving the second linear motion guide device in a direction perpendicular to the plastic film;
(h) (1) Only the first marking member moves in the lateral direction in contact with the plastic film, thereby forming the first easy-cleavage portion, and (2) Progress of the plastic film When the first easy-cleavage portion reaches the position of the second stamping member with respect to the direction, the second stamping member starts to slidably contact the plastic film, and (3) the first easy-cleavage portion is When the predetermined size is reached, the first marking member is separated from the plastic film, and (4) when the second easy-cleavage part is the same size as the first easy-cleavage part. Further, the second marking member is separated from the plastic film, and (5) the apparatus repeats a cycle consisting of separating the first and second marking members from the plastic film for a predetermined time. . 2. The apparatus according to claim 1, wherein the marking member is composed of a large number of hard particles having a Mohs hardness of 5 or more having sharp corners. 2. The apparatus according to claim 1, wherein the marking member is constituted by a plurality of parallel edges formed on an outer peripheral surface of the roll. 4. The apparatus according to claim 3, wherein the edge is periodically provided with a notch. The apparatus according to any one of claims 1 to 4, wherein a platen member is disposed behind the plastic film, and the first and second marking members are pressed against the plastic film on the platen member, Thus, the first and second easy-cleavage portions are formed. The apparatus according to any one of claims 1 to 5, wherein the plurality of first marking members are fixed at equal intervals to one slide member that moves along the first linear motion guide device. The second marking member is fixed at an equal interval to one slide member that moves along the second linear motion guide device. The apparatus according to any one of claims 1 to 6, wherein a longitudinal distance between the first marking member and the second marking member is half of a longitudinal length of the first and second easy-cleavage portions. A device characterized by being. The apparatus according to any one of claims 1 to 7, wherein an interval between the adjacent first and second marking members in a transverse direction is a smaller interval between the first easy-cleavage part and the second easy-cleavage part. A device characterized by being equal to.

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