JP2606009B2 - Bag making method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a corner-cut paper or plastic bag having a corner cut, wherein each corner of the bag is provided with an obtuse or circular corner cut. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a rectangular bag which is finally sealed in a four-sided seal is shipped when a right angle portion of each corner hits another bag during transportation of the bag. Can occur,
Alternatively, an obtuse or circular corner cut is made at the right angle portion so as not to hurt the fingers of the consumer after the product is made. As the prior art relating to the corner cut, Japanese Patent Application Laid-Open Nos. Sho 57-194954, 59-187550, and 61-169236 are disclosed.

[0005] In the case where the above-mentioned corner cutting is performed in-line in the bag making process, for example, FIG. 5, one long sheet or two long sheets (paper, plastic film, a composite film thereof) are used. The vertically stacked long sheet (a) is conveyed in the direction of the arrow, and a vertical seal portion (1) is formed in a plurality of rows at intervals of width D in the conveying direction of the sheet (a) by a heat sealing mechanism, and the sheet is perpendicular to the conveying direction. After forming a continuous rectangular bag body A by applying a horizontal sealing portion (2) at every predetermined pitch P, a diamond-shaped cutting blade (3) is formed.
By means of the corner punching cutting means (3) provided with a), the both ends of the sheet (a) of the continuous bag A and the respective corner corresponding portions of the bag A in the middle of the sheet A as shown in FIG. Punching and cutting are performed at the same phase as the seal portion (2) at every pitch P / 2 to form a cut portion (4) for corner cutting.

Subsequently, the sheet (a) is longitudinally cut in a row direction along a middle of the vertical seal (1) by a slitter (5) such as a rotary cutter, a knife cutter, etc. At right angles to the straight cutting blade (6a) of the line cutting mechanism (6).
By performing horizontal cutting in the same phase and the same pitch (P / 2) as the cut portion (4) in a split state, a corner cutting portion (8) is provided at a corner portion, and an opening (7) is provided at one end portion. ) Is manufactured as shown in FIG.

In the conventional corner cutting method, as shown in FIG. 5, a diamond-shaped cut portion is formed on the sheet (a).
After forming (4), perform vertical cutting (1) and horizontal cutting (2).
(3a), the vertical and horizontal line cutting blades (5), (6a) are not properly adjusted with respect to each other, the positioning of the sheet (a) is insufficient, or the cut ( 4) The acute angle portion of 4) is not aligned with the vertical cutting line (9) or the horizontal cutting line (10), so that misalignment is likely to occur.

As shown in FIG. 7, which is an enlarged view of a portion B of FIG. 4, a notch in the longitudinal direction of a rhombic notch (4) having four sides each having a curvature curved inside the radius R. Sharp corners (4
(a), (4a) and the vertical cutting line (9) formed by the slitter are not completely aligned, or the cutting edges (4b), (4b) ) And the horizontal cutting line (10) are not aligned, the sheet (a) is cut by the cutting lines (9) and (10) as shown in FIG. Is not split at the cut corner (4a), and the protruding part (11) due to the sharp part (4a) occurs at the edge near the corner cutting part (8) of the bag A after cutting. Is what you do.

[0007]

SUMMARY OF THE INVENTION According to the present invention, after forming a punch cut section for forming a corner cutting section on a long sheet, vertical and horizontal cutting lines are formed on the punch cut section. It is an object of the present invention to prevent a protrusion from being generated at an edge portion near a corner cutting portion of a bag even when cutting is performed in a misaligned state with a slight deviation.

[0008]

Means for Solving the Problems A first invention of the present invention is:
The inner surface of the long sheet that can be sent is sealed.Several rows of vertical seals are applied along the transport direction, and horizontal seals are applied at predetermined pitch intervals in the width direction. The vertical and horizontal seal area is punched at a half pitch interval of the horizontal seal by a punching blade surrounded by, and then the vertical slit is cut in the vertical seal area along the long sheet feeding direction, and then the same pitch as the punching is performed. A bag-shaped body provided with a corner cutting portion, wherein a bag-shaped body provided with a corner cutting portion is manufactured by performing horizontal cutting in a direction perpendicular to a transport direction at intervals. Further, the second invention of the present invention provides a vertical seal of several rows along the feeding direction of the superposed long sheet capable of being sealed on the inner surface to be fed, and a horizontal seal at predetermined pitch intervals in the width direction, at a crossing intersection. A vertical and horizontal seal area is punched out at the same pitch interval as the horizontal seal by a punching blade having a rounded shape of a predetermined curvature and enclosing in a substantially cross-shaped plane, and then in the vertical seal area and the vertical seal along the long sheet feeding direction. It is characterized in that a bag-like body provided with a corner cutting portion is manufactured by cutting the intermediate portion between the slits in a vertical slit, and then performing horizontal cutting in a direction perpendicular to the feeding direction at the same pitch interval as the punching. It is a manufacturing method of a bag-like body provided with a corner cutting part.

[0009]

The bag making method of the present invention does not use a diamond-shaped punching blade as a conventional cutting blade for corner cutting.
Corner cutting is performed by a punching blade that surrounds a cross shape at a predetermined curvature R in a substantially cross-shaped plane with a predetermined curvature R, and like a diamond-shaped punching blade whose opposite sides are convexly curved inward to each other, at a quadrangle. Since a punching blade having no sharp edge is used, a clean corner cutting portion can be obtained without worrying that a projection is generated in the conventional corner cutting portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first invention of the present invention will be described in detail according to an embodiment. FIGS. 1 and 2 show a state in which a long sheet (a) capable of being folded in two or two sheets or having a cylindrical inner surface is fed. , Several rows of vertical seals (1) in the sheet feeding direction by a heat sealing means, and horizontal seals (2) at predetermined pitch intervals P in the width direction.
With a punching blade (14a) having a cross section with a predetermined curvature R with a roundness and a substantially cross-shaped plane, at a half pitch interval (1 / 2P) of the horizontal seal (2). Vertical seal
(1) and a horizontal seal (2) are punched in the area corresponding to the intersection of the seal and the vertical seal (1), and then the long sheet
(a) After cutting the slit in the vertical seal (1) area along the feeding direction, cutting is performed in the direction perpendicular to the feeding direction of the long sheet at the punching pitch interval (1 / 2P), so that the corner is cut. A bag-like body provided with a cutting portion is manufactured.

In the method of the present invention, FIG. 1, a long sheet (a) as a material for bag making is fed in the direction of the arrow, and the longitudinal sealing means (12) and the horizontal sealing means (13) are sequentially arranged from the upstream side of the feeding. ,
It comprises a corner punching means (14), a vertical slit means (15), and a horizontal cutting means (16).

The long sheet (a) is supplied as a folded sheet, two superposed sheets, or a cylindrical flat sheet at the stage of being introduced below the vertical sealing means (12). On the inner surface of the sheet (a) to be overlapped, only the regions which are heated to each other by a material which is heated and melted on the inner surface of the sheet main body or by a sealant layer applied in advance can be sealed (heat-fused).

Materials used for the long sheet (a) include:
Thermoplastic films such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, etc., or their copolymer films or composite films, thermosetting plastic films such as polyester films or films coated with a thermoplastic resin on one side of paper, etc. .

Vertical sealing means according to the first aspect of the present invention
As shown in FIGS. 1 and 2, (12) is provided in three rows in the feeding direction at both ends in the width direction of the long sheet (a) and the center of the long sheet (a). A heating block (12a) having a straight seal shape is provided above the long sheet (a).
The lower side is equipped with a seal platen (12b), and the heating block (12a)
And the sealing platen (12b) are moved up and down relatively to each other at both ends and the center of the width of the long sheet (a) introduced therebetween, and the predetermined feeding length of the long sheet (a) (for example, The vertical seal (1) is applied by repeatedly pressing from above and below at every pitch interval P, or 2P, or 3P in the feeding direction. The vertical sealing means (12) may be of a rotary type in which a heating block is provided in a seal shape on the outer peripheral surface of the rotary cylinder in addition to the reciprocating operation as described above.

In the present invention, the horizontal sealing means (13)
In one embodiment of FIGS. 1 and 2, the long sheet (a) is provided in one line in the width direction perpendicular to the feeding direction. In FIG. 2, a straight sheet is provided on the upper side of the long sheet (a). A heating block (13a) having a seal shape and a seal platen (13b) on the lower side are provided, and a fixed pitch interval (in the feeding direction of the long sheet (a)) is provided.
For example, a horizontal seal (2) for each row while maintaining the pitch interval P)
Is applied.

The number of columns of the vertical sealing means (12) and the number of rows of the horizontal sealing means (13) are not necessarily limited to the above. The vertical sealing means is set correspondingly.

The corner punching means (14) according to the present invention comprises:
A punching blade (14a) that surrounds the surface in a substantially cross shape,
(14a) A punching platen (14b) is provided facing the lower side and has a constant pitch interval (1/1 with respect to the pitch interval P of the horizontal seal (2)).
2) The vertical seal of the long sheet (a) moves up and down every time
(1) A punching portion (17) is formed in the region and in the intersection region between the vertical seal (1) and the horizontal seal (2).

The vertical slit means (15) in the first invention of the present invention is provided substantially at the center of the width of the long sheet (a), and is provided in the area of the vertical seal (1) formed by the vertical seal means (12). Is slit along the sheet feeding direction. In one embodiment, the vertical seal (1) and the horizontal seal (2) are applied by the vertical and horizontal seals (12) and (13), respectively, and then the center vertical seal (1) area is slit and cut into a long shape. 2 length sheets (a)
It is divided into rows, and blade materials such as cutter knives or rotary cutters can be used. If necessary, both ends of the long sheet (a) may be slit.

The horizontal cutting means (16) in the present invention
Introduces a long sheet (a) slit vertically along the long sheet feeding direction between the upper cutting blade (16a) and the lower cutting blade (16b), and the upper cutting blade
(16a) is moved up and down to cut the long sheet (a) at a constant pitch interval (the same pitch interval as the punching means (14)) in a horizontal direction perpendicular to the sheet feeding direction, In the seal area of the horizontal seal (2) formed in the previous stage, and the next horizontal seal (2) which is one pitch away from the horizontal seal (2)
Linearly in the direction perpendicular to the sheet feeding direction,
The sheet is cut horizontally.

In FIG. 2, (17) is a predetermined infeed roller means for conveying the long sheet (a), and (18) is a long sheet (a), (a) divided into two by longitudinal cutting. Each of the predetermined outfeed roller means, (19), (2
0) is a guide roller.

In the present invention, the longitudinal sealing means (12), the horizontal sealing means (13) and the corner punching means (14) are used for feeding the long sheet (a) during the sealing operation and the punching operation. It is possible to reciprocate in the transport direction of the long sheet (a) so that it moves forward at the same speed as the moving speed, and after the pressing operation is released, it moves backward by the amount advanced and returns to the original position. The long sheet (a) is intermittently or continuously fed for each length in the feeding direction of the bag-shaped body (A) depending on whether the above-mentioned units are not reciprocated or reciprocated. is there.

One embodiment of the first invention of the present invention is as follows.
This will be described in detail with reference to a plan view of the bag making process shown in FIG. 1A and a side view of FIG. First, Figure 2, Folding,
Alternatively, a long sheet (a) of two sheets or a flat cylindrical shape is fed forward by an in-feed roller (17). The fed long sheet (a) is heated by the heating seal block (12a) of the vertical sealing means (12) and the sealing platen (12).
b) and the specified length of long sheet (a)
The vertical sealing means (12) is moved up and down at every (feed pitch interval P or 2P), and the longitudinal seal (1) is sequentially placed along the feeding direction at the center and both ends in the width direction of the long sheet (a). ).

The long sheet (a) containing the vertical seal (1)
The next horizontal sealing means (13) seals the long sheet (a) at a predetermined feed pitch interval P in the horizontal direction perpendicular to the feed direction.
(2) is applied.

Subsequently, as shown in FIG.
(a) a longitudinal seal (1) along the feeding direction (arrow direction) at the center and both ends, and a horizontal seal (2) at a pitch interval P perpendicular to the feeding direction of the long sheet (a). Long sheet with
(a) is formed by a corner punching means (14) provided with a punching blade (14a) enclosing in a substantially cross-sectional shape at a pitch of 1/2 P with respect to the pitch of the horizontal seal (2). And long sheet (a)
In the area corresponding to the intersection of the vertical seal (1) and the horizontal seal (2), and in the area of the vertical seal (1), the punching part (2
1) stamping and forming. In addition, the installation posture of the punching blade (14a) is as follows: Among the cross patterns, one vertical character pattern is in the same direction as the vertical seal (1), and one horizontal character pattern is the horizontal seal (2).
It is installed so that it faces in the same direction as.

Next, the longitudinal sheet (a) is divided into two rows by longitudinally slitting the area of the central longitudinal seal (1) along the longitudinal cutting line (22) by the longitudinal slit means (15). I do.

Subsequently, the two rows of long sheets (a) are introduced into the horizontal cutting means (16) via the outfeed roller (18) and fed to the horizontal cutting means (16). Horizontal cutting along the horizontal cutting line (23) in the direction perpendicular to the feeding direction of the long sheet (a) at the pitch interval 1 / 2P (the same phase as the punching pitch interval of the punching section (21)) Is carried out to produce a bag-like body (A), and the bag-like body (A) is accumulated as a product in a predetermined delivery means and discharged.

FIG. 3 is a plan view for explaining the details of the corner cutting by the corner punching blade (14a) in the method of the present invention. As shown in FIG. (14a) is a cross-shaped pattern (
In the cross hatched area, the outer periphery of the pattern corresponding to the intersection of one vertical character and one horizontal character has a circular portion such as a circle with a radius of curvature R and an elliptical shape. The crosswise pattern of the punching blade (14a) is provided with flat portions (14c) each having a width W with respect to the direction of the vertical seal (1) and the horizontal seal (2).

The thickness of the cross pattern of the punching blade (14a) must be smaller than the width of each of the vertical and horizontal seals (1) and (2). Further, each length between vertical and horizontal character across L _1, L ₂
May be smaller or larger than the width of the horizontal seal (2) and the width of the vertical seal (1), respectively. In addition, as a material of the punching blade (14a) formed so as to be surrounded in a cross shape, a punching cutting blade as used for ordinary blanking of a paper container blank can be used.

As shown in FIG. 3A, the punching blade (14)
According to a), a punching cutting line having a roundness with a radius of curvature R on the outer periphery of the intersection (a line along the outer periphery of the cross hatched portion) and both ends of each vertical and horizontal one-character pattern by the flat portion (14c) of the punching blade (14a). A cross-section punching portion (21) having a flat punching cutting line is formed.

Subsequently, the long sheet (a) is placed on the flat portion (1).
4c) is vertically cut along the vertical cutting line (22) by the vertical slitting means (15) at right angles to the flat punching cutting lines at both ends of each vertical and horizontal one-character pattern corresponding to the horizontal cutting means ( A horizontal cutting is performed along a horizontal cutting line (23) according to (16), and a roundness (24) having a radius of curvature R is formed at each corner (8) as shown in FIG. Is cut along the horizontal cutting line at a pitch interval 1/2 P with respect to the forming pitch interval P, and an opening is formed at one end.
A bag-like body (A) provided with (7) is formed.

In addition, as shown in FIG.
4a), a flat punching cutting line formed by flat portions (14c) at both ends of each vertical and horizontal one-character pattern has a width W (for example, 1.5 mm).
(Around 2.5 mm), so even if the position of the vertical cutting line (22) is slightly shifted in the width direction of the long sheet (a), the position of the horizontal cutting line (23) is long. Even if the sheet (a) is slightly shifted in the feeding direction, an allowable width W can be obtained.

Further, as shown in FIG.
A single bag-shaped body made by the punching cutting line by (14a), the vertical cutting line (22) by the vertical slitting means (15), and the horizontal cutting line (23) by the horizontal cutting means (16) At the edge near each corner (8) of (A), the roundness (24) of the bag-like body (A) is formed by the flat punching cutting line by the flat portion (14c) of the punching blade (14a). Right angles (25), (25) are formed on both sides, but the tip angles of the right angles (25) do not directly contact other products or fingers or cause snagging. In order to achieve this, in the method of the present invention, the roundness (24) formed at each corner (8) of the bag-shaped body (A) is preferably formed at a right angle (25), (25). It is desirable to project outwardly from a straight line connecting the distal ends. Next, the second invention of the present invention will be described in detail according to an embodiment. FIG. 4, a long sheet (a)
And several rows of longitudinal seals (1) (in FIG. 4, one row at each end of the long sheet (a)) applied by the vertical sealing means (12) along the feeding direction of the long sheet (a). A long sheet provided with a horizontal seal (2) provided at a predetermined pitch interval (for example, a pitch interval P) along a horizontal direction orthogonal to the feeding direction of
The long sheet (a) in the area of the horizontal seal (2) of (a) is punched and cut by the corner cut punching means (14), and the punching section ( After the formation of (21), the intermediate part between the longitudinal seals (1), (1) at both ends of the long sheet (a) is longitudinally cut by the longitudinal slit means (15) in the longitudinal direction along the transport direction (cutting). (Line (22)), and then horizontally cutting (horizontal cutting line (23)) the area inside the horizontal seal (2) area with the horizontal cutting means (16) to remove the bag-like body (A). It is to make bags. In the second invention method, the opening (7) of the bag-shaped body (A) is formed by a vertical cutting line (22). Further, the number of the vertical slit means (15) in the second invention is appropriately set according to the number of rows of the vertical seal (1).

[0033]

According to the method of the present invention, vertical and horizontal sealing is performed using a superposed long sheet, corner punching cutting is performed, and finally vertical and horizontal cutting is performed to produce a bag-like body having a corner cutting portion. When bagging,
Even if the position of the vertical cutting line and the horizontal cutting line is slightly deviated from the corner punching cutting line in the width direction or the feeding direction of the long sheet, a corner is formed at the edge of the bag-shaped body made. A bag-like body with a good corner cutting part can be made without appearance of sharp projections due to mismatch between the punching cutting line and the vertical and horizontal cutting lines, and a bag with a corner cutting part It has a remarkable effect on bag making of the body.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a bag making process according to an embodiment of the first invention.

FIG. 2 is a side view of a bag making process illustrating an embodiment of the method of the present invention.

FIG. 3 (a) is a plan view illustrating the relationship between corner punching cutting and a vertical cutting line and a horizontal cutting line in the method of the present invention. (B) It is a top view of the bag-like body provided with the corner cutting manufactured by the method of this invention.

FIG. 4 is a plan view for explaining a bag making step in one embodiment of the second invention.

FIG. 5 is a plan view showing a state of corner cutting in a conventional bag making process.

FIG. 6 is a plan view illustrating a general bag-like body provided with a corner cutting portion.

FIG. 7 is a partially enlarged plan view illustrating a conventional corner cutting method.

FIG. 8 is a plan view illustrating a corner cutting portion of a bag-like body obtained by a conventional corner cutting method.

[Explanation of symbols]

1… Vertical seal part 2… Horizontal seal part 3… Corner punching cutting means 3a… Rhombus punching cutting blade 4… Punching part 4a, 4b… Punching tip part 5… Vertical slitting means 6… Horizontal cutting means 7… Bag Shape opening 8… Corner cutting part 9… Vertical cutting line 10…
Horizontal cutting line 11 ... Projection 12 ... Vertical sealing means
13 ... horizontal sealing means 14 ... corner punching cutting means 14a ... punching blade 14c ... flat part 15 ... vertical slit means 16 ... horizontal cutting means 17 ... infeed roller 18 ... outfeed roller 19,20 ... guide roller 21 ... corner punch section 22 ... vertical cutting line 23 ... transverse cutting line 24 ... round 25 ... right angle portion a ... long sheet A ... bag-like member B ... enlarged portion W ... flat portion width L ₁ ... single vertical pattern length L ₂
… Horizontal character pattern length R… Curvature radius

Claims (2)

(57) [Claims] 1. A longitudinal seal of several rows is provided along a transport direction of a superposed long sheet capable of being sealed on an inner surface to be transported, and a horizontal seal is provided at predetermined pitch intervals in a width direction, and a cross-shaped intersection is rounded with a predetermined curvature. After punching out the vertical and horizontal seal area at a half pitch interval of the horizontal seal by a punching blade that surrounds the plane in a cross shape, and subsequently cutting the vertical slit area in the vertical seal area along the long sheet feeding direction, Manufacturing a bag-like body provided with a corner cutting part by transversely cutting in a direction perpendicular to the feeding direction at the same pitch interval as the punching, thereby manufacturing a bag-like body provided with a corner cutting part. Method. 2. A plurality of longitudinal seals are provided along the feeding direction of the superposed long sheet which can be sealed on the inner surface to be fed, and horizontal seals are provided at predetermined pitch intervals in the width direction, so that the crossing portion is rounded at a predetermined curvature. The vertical and horizontal seal areas are punched at the same pitch interval as the horizontal seal by a punching blade that surrounds the cross section in a substantially cross-sectional shape, and then the longitudinal seal area and the intermediate portion between the vertical seals are vertically aligned along the long sheet feeding direction. After cutting the slit, by performing horizontal cutting in a direction perpendicular to the transport direction at the same pitch interval as the punching, a bag-shaped body having a corner cutting portion was manufactured, and a corner cutting portion was provided. A method for producing a bag.