JPH044203B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming tearing means for opening a packaging bag.

Prior Art Conventionally, in order to make it easy to open a pillow-wrapped packaging bag, for example, a V-shape, a U-shape, or
Other proposals have been made to form linear tearing means. However, with conventional opening means, it is difficult to tear the end seal in the intended direction when opening the seal, and there are problems such as the end seal being cut in an unexpected direction, spilling the contents, or causing damage. Ta. Therefore, as a result of repeated trial production in order to obtain a new means for easily and reliably opening the packaging bag, the applicant of the present application has found that at least one end of the pillow packaging bag is pasted with a predetermined size from one outer edge. We came up with the idea that it would be sufficient to integrally form the wide bonded part and the narrow bonded part that follows it, and provide a cut for opening in the wide bonded part, and based on this proposal we proposed a utility model. The registration application has been completed.

For example, FIG. 4 shows an embodiment of a packaging bag provided with the opening means, and FIGS. 5b and a
4 shows a plan view of the packaging bag shown in FIG. 4 as seen in the direction of the X arrow and the direction of the Y arrow, respectively, and FIG. 6 is an enlarged view of the cross section taken along the line -- in FIG. 5b. In the figure, for example, a pillow-wrapped packaging bag 2
, there is a bonding part 13 in which both end edges 12, 12 in the longitudinal direction of a cylindrical packaging material are bonded together in the shape of palms together.
is formed. This joined part 13 in the shape of palms
is formed at a position close to the outer edge 14 of the packaging bag 2 in the longitudinal direction, and the bonded portion 13 is folded back at the bonded base 15 in the direction opposite to the outer edge 14 of the packaging bag 2. It's becoming like that.

On the other hand, at both ends of the packaging bag 2 in the longitudinal direction, end bonding portions 1 are formed by overlapping the palm-shaped bonding portions 13 on the longitudinal ends of the bag body 2 and bonding them together.
6 and 16 are formed respectively. and Figure 5a
As shown in FIG.
A wide laminated portion 17 of a constant dimension extending from 4 to straddle the palm-shaped laminated portion 13 and a narrow laminated portion 18 continuous thereto are integrally formed. A predetermined non-bonded portion 19 is formed within the wide bonded portion 17 and extends obliquely from the outer edge 14 in the longitudinal direction of the packaging bag 2 . At approximately the center of this unattached portion 19, a reference numeral 20a,
Discontinuous linear opening notch 2 indicated by 20b
0 is punctured. That is, as a part of the opening notch 20, a notch 20a is made in the longitudinal outer edge 14 of the packaging bag 2, as shown in FIG.
A notch 20b is made across the. With this configuration, cutting in the lateral direction can be performed reliably and easily.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an apparatus that can suitably apply the above-mentioned opening means to packaging bags such as pillow packaging bags.

Means for Achieving the Object In order to achieve the above object, the present invention provides a cutting blade which is movable forward and backward on one side of a pair of sealing bodies disposed opposite to each other, and a longitudinal bonding portion is provided at the longitudinal edge of the packaging material. In an end sealing device that forms and cuts a transversely laminated portion that intersects the laminated portion in the formed cylindrical bag body, an end sealing device that is formed on opposing surfaces of both seal bodies and that is attached to the packaging bag in its longitudinal direction. a wide seal surface forming a wide bonding surface that extends from the outer edge of the bag across the bonding portion in the vertical direction; a narrow sealing surface that forms a narrow bonding surface that is integrally continuous with the bonding surface; and a narrow sealing surface that is formed on the wide sealing surface so that when the packaging bag is held between both sealing bodies, the outer side in the longitudinal direction of the packaging bag a non-welded region that extends from the edge to at least a length beyond the longitudinally bonded portion of the packaging bag; and a non-welded region that is adjacent to the cutting blade and that moves forward and backward together with the cutting blade, and that when the cutting blade moves forward, the non-welded region and a cutting blade positioned to pass through the packaging bag, and the cutting blade forms a discontinuous linear cut at a position straddling the longitudinal outer edge of the packaging bag and the base of the longitudinally bonded part. It is characterized by being set in a shape that can be obtained.

Embodiments Next, a device for forming an opening tearing means according to the present invention will be described in detail below using preferred embodiments with reference to the accompanying drawings. Fig. 1 is a front view of the device according to the present invention, and Fig. 2 is a - of Fig. 1.
FIG. That is, in the figure, reference numeral 30 indicates an end seal device that applies a weld seal to a predetermined position in the longitudinal direction of the packaging bag, and this device 30 is basically formed of an upper seal body 32 and a lower seal body 34 (end seal The basic structure and operating mechanism of the device itself are known). The lower seal body 34 is attached via a pair of support members 38, 38 to a lower arm 36 extending horizontally from the main body portion of the packaging device (not shown), and has its sealing surface 46 directed upward. As shown in FIG. 2, a heater 40 is embedded in the lower seal body 34 to heat the seal body to a predetermined temperature and thermally weld the ends of the package 70.
Further, on the sealing surface 46, a cutting blade 42, which will be described later, is provided.
A slit groove 44 having a predetermined width is formed to allow insertion and passage of the slit. Furthermore, as shown in FIGS. 3a and 3b, the sealing surface 46 includes a wide sealing surface 46a for forming the wide bonding surface 17 on the packaging bag 2 shown in FIG. , the packaging bag 2 shown in FIG. 5 is provided with a narrow sealing surface 46b for forming a narrow bonding surface 18. A non-welding groove 48 of a predetermined width slightly inclined with respect to the slit groove 44 is bored at a predetermined position of the wide sealing surface 46a, and a cutting blade 50 to be described later is inserted into this groove 48 so as to be freely retractable. It is becoming more and more common. In this embodiment, the non-welding groove 48 is used as a "receiver" for the cutting blade 50, but the first
In the rotary seal mechanism, which will be described later with reference to FIG. ” terms shall be used.

Further, the upper seal body 32 is horizontally attached to the upper arm 52, which also extends horizontally from the packaging machine main body and is located directly above the lower arm 36, via integral buffer members 54, 54 that house spring mechanisms. and has its sealing surface 56 directed downward. A heater 40 is also embedded in this upper seal body 32, and a slit groove 62 is provided in the longitudinal direction of the upper seal body 32.
is drilled through. Further, as shown in FIG. 2, a pneumatic cylinder 58 is pivotally supported on the upper arm 52 via a bracket 57 in a hanging state, and a cutting blade 42 is fixed to the tip of a piston rod 60. The cutting blade 42 is housed in the through slit groove 62 formed in the upper seal body 32 so as to be able to move forward and backward, and by biasing the cylinder 58, cuts the seal surface 5 through the slit groove.
It is designed to be able to extend and retreat from 6.

Note that as shown in FIG. 3a, the upper seal body 32
Similarly to the sealing surface 46 of the lower seal body 34, the sealing surface 56 of the lower sealing body 34 is also integrally formed with a wide sealing surface 56a and a narrow sealing surface 56b.
In addition, the non-welding groove 4 bored in the lower sealing surface 46
Similarly, a non-welding groove 64 is penetrated at a position corresponding to 8.

As shown in FIGS. 1 and 2, a cutting blade 50 is fixed parallel to the cutting blade 42 at a position slightly offset from the center.
operates synchronously with the cutting blade 42 by energizing the cylinder 58 to cut the upper seal body 32.
It is designed to be able to move forward and backward through the non-welding groove 64 that is bored through the. When the upper and lower seal bodies 32 and 34 approach each other and bring the seal surfaces 46 and 56 into contact, the cutting blade 42 enters the slit groove 44 provided in the lower seal body 34, and the cutting blade 50 is adapted to enter into a non-welding groove 48 provided in the lower seal body 34.

As shown in FIG. 7, which is a sectional view taken along the line - in FIG. 1, the cutting blade 42 has a length sufficient to cut the bag 70 at right angles to the flow direction thereof,
The cutting blade 42 is slidably inserted into and held in a pair of U-shaped grooves formed in the movable attachment members 66, 66 of the pair of buffer members 54, 54. Note that the cutting blade 50 is attached to the cutting blade 42 via an intermediate member 68 having a predetermined inclined thickness. This intermediate member 68 has non-welding grooves 48, as shown in FIG.
In correspondence with the fact that the slit grooves 64 are bored at a required angle of inclination relative to the slit grooves 44 and 62, the plate member is made of a plate having an inclination of the same angle. Therefore, when the non-welding groove 48 (64) is bored parallel to the slit groove 44 (62) as shown in FIG. As the intermediate member 68 inserted between the two, a plate material having a parallel thickness and no slope is used.
Note that the tip of the cutting blade 50 cuts into the opening notch 20 as shown in FIG. 5, for example.
0b, the blade shape is made of two chevron-shaped protrusions, and as shown in FIGS. 11 and 12, there are three discontinuous opening notches 20a.
20c, a blade shape consisting of three chevron-shaped protrusions is adopted.

Returning to FIGS. 1 and 2, reference numeral 70 is
A cylindrical bag body with a center seal is shown, and this bag body 70 is adapted to be conveyed horizontally on a conveyor 72 with a packaged item stored inside. Further, the integral upper seal body 32 and lower seal body 34 are moved to a second position by a drive mechanism (not shown).
The end seals are applied to the cylindrical bag body by moving toward and away from each other while drawing trajectories shown by dashed-dotted circular arrows in the figure.

Next, FIGS. 14 and 15 show another embodiment of the end seal device 30,
The upper seal body 32 and the lower seal body 34 are a so-called rotary seal mechanism rotated by a known rotation mechanism. In this case as well, the cutting blade 42 and the cutting blade 50 are spaced apart from each other on the sealing surface of one of the upper sealing bodies 32, for example, in a parallel positional relationship. A blade receiving member 74 for receiving the blade portion of the cutting blade 42 is disposed on the sealing surface of the lower seal body 34, and a non-welding zone is formed at a position corresponding to the cutting blade 50. A blade receiving member 76 is disposed at. Note that the first
Cutting blade 50 and blade receiving member 76 in Figure 4
The external shape is schematically shown in FIG. 15. In this case, a notch 78 is provided at the tip of the cutting blade 50,
Discontinuous opening cuts 20 are formed when the package is sealed.

Note that the upper seal body 32 and the lower seal body 34
Non-welding grooves (non-welding areas) 48 and 6 provided in
4 and the shape of the cutting blade 50, various shapes of opening cuts shown in FIGS. 10 to 13 can be formed.

Functions of the Embodiment Next, the functions and effects of the opening tear-forming device according to the present invention configured as described above will be briefly described. End seal device 30 shown in FIG.
When operated by a known drive mechanism that does not indicate the time, the upper and lower seal bodies 3 move as shown in the trajectory in FIG.
2 and 34 are close to each other and pinch the cylindrical bag 70 that is conveyed on the conveyor 72 from above and below, and end sealing is performed by the thermal welding action of the sealing surfaces 46 and 56. At this time, the lower sealing surface 46 and the upper sealing surface 56 are, for example, as shown in FIG.
Since the bag body 70 has a shape shown in FIG.
are formed correspondingly and integrally. Moreover, the wide bonding portion 17 has the non-welding groove 4.
Under the cooperative action of 8 and 64, an unbonded portion 19 of a predetermined width that is not thermally welded is formed.

Also, capturing this timing, the cylinder 58 is energized, and the cutting blade 42 and the cutting blade 50 synchronously extend from the sealing surface 56 of the upper seal body 32.
They enter the slit groove 44 and the non-welding groove 48 provided in the sealing surface 46 of the lower seal body 34, respectively. That is, when the cutting blade 42 enters the slit groove 44, the cylindrical bag 70 is cut at right angles to its flow direction. At this time, since the cutting blade 50 acts synchronously with the cutting blade 42, the cutting blade 50 cuts through the unbonded portion 19 of a predetermined width shown in FIG. It enters into the non-wearing groove 48. That is, as a result, the unsealing notch 20 is connected to the unbonded part 1.
9 will be formed. Further, as shown in FIGS. 8 and 9, the slit groove 44 and the non-welding groove 48
are also set parallel, and the cutting blade 42 and the cutting blade 50 are
By setting the slits parallel to each other, an opening cut 20 as shown in FIG. 10 can be obtained. Furthermore, by changing the shape of the chevron-shaped portion at the tip of the cutting blade 50, two discontinuous cuts 20a and 20b as shown in FIGS. 5 and 13 can be made, or as shown in FIGS. 11 and 12. It is also possible to form three cuts 20a to 20c at the same time.

Effects of the Invention As explained in detail above, according to the apparatus according to the present invention, the above-mentioned opening means that can reliably and easily cut out the package can be provided at the same time when the end seal is applied to the packaging bag. I can do it. Moreover, since the structure is extremely simple, there are useful advantages such as the ability to reduce the structural cost of the device.

Further, since the incision can be formed at a position spanning the longitudinal outer edge of the packaging bag and the base of the longitudinally bonded part, tearing in the lateral direction can be performed reliably and easily.

[Brief explanation of drawings]

Fig. 1 is a front view of a device forming a tearing means for opening according to the present invention, Fig. 2 is a vertical sectional view taken along the line - - in Fig. 1, and Fig. 3 is a seal surface shape of a seal body used in the device of the present invention. FIG. 4 is a schematic perspective view of a pillow packaging bag, FIG. 5 is a schematic diagram of a packaging bag equipped with an opening means performed by the apparatus of the present invention, and
The figure is a sectional view taken along the - line of Fig. 5b, Fig. 7 is a sectional view taken along the - line of Fig. 1, Fig. 8 is an explanatory view showing the sealing surface of a seal body according to another embodiment, and Fig. 9 is a separate view. FIGS. 10 to 13 are explanatory diagrams showing opening means according to different embodiments, and FIG. FIG. 15, which is a cross-sectional view when the invention is applied, is a schematic perspective view showing the shape of the cutting blade and its blade receiving member used in the mechanism shown in FIG. 14. 30... End seal device, 32, 34... Seal body, 42... Cutting blade, 48... Non-welding groove (non-welding area), 50... Cutting blade, 64... Non-welding groove (non-welding area) .

Claims (1)

[Scope of Claims] 1. A cutting blade is provided on one side of a pair of facing seal bodies so as to be movable back and forth, and the adhesive is attached to a cylindrical bag body in which a longitudinal adhesive part is formed on the longitudinal edge of the packaging material. In an end sealing device that forms and cuts a horizontal pasting part that intersects with the joining part, the end sealing part is formed on the opposing surfaces of both seal bodies, and the vertical pasting part is formed on the packaging bag from the outer edge in the longitudinal direction. a wide sealing surface that forms a wide bonding surface extending across the wide sealing surface; and a narrow sealing surface that is continuous with the wide sealing surface and is formed on the opposing surface of both seal bodies and continues integrally with the wide bonding surface of the packaging bag. a narrow sealing surface that forms a bonding surface of the packaging bag; and a narrow sealing surface that forms a bonding surface of the packaging bag; a non-welded area that extends beyond the bonded portion; and a cutting blade that is adjacent to the cutting blade, moves forward and backward together with the cutting blade, and is positioned so as to pass through the non-welded area when moving forward. The incision blade is characterized by being set in a shape capable of forming a discontinuous linear incision at a position straddling the longitudinal outer edge of the packaging bag and the base of the longitudinally laminated portion. A device that forms tearing means for opening a packaging bag.