JP2023076091A - Packaging bag and packaging device using the packaging bag - Google Patents

Abstract

To provide a packaging bag that can be efficiently sealed and has a good appearance.SOLUTION: A bag body 2, which has a rectangular first face 4 and a rectangular second face 5 overlapped by folding a single sheet, and an insertion opening 6 for a packaged item opened along one side of the rectangle, is provided with a band-shaped adhesive layer 9 formed along the opening of the insertion opening 6 on the opposite side 4a facing the second face 5 in the first face 4, and an ear part 10 connected to the second face 5 and projecting outward from the first face 4, which can be cut off with the insertion opening 6 sealed by the adhesive layer 9.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for packaging items for delivery such as postal mail and home delivery, and a packaging apparatus using the packaging bag.

2. Description of the Related Art As a packaging body for packaging relatively small items for delivery, there is known an envelope-shaped folded cardboard. In such a packaging bag, three sides of a rectangular bag body are closed in advance and only one side is opened, and this opening is provided with a sealing flap. An adhesive tape for sticking to the bag body is attached to the flap together with a release paper.
After the items to be packaged are accommodated in such a packaging bag, the opening is aligned, the release paper is peeled off, and the flap is folded toward the main body to seal the bag.

Registered Utility Model No. 3231379 JP-A-2000-085798

In order to fold and attach the flap to the conventional packaging bag, it is necessary to align the opening with the base of the flap and close it properly. If the flap is attached without properly closing the opening, the opening may partially protrude from the sides of the flap, resulting in a failure to seal.
However, since the center of the bag body containing the items to be packaged is bulging, it is difficult to fit the opening perfectly. In particular, when the shape and size of the items to be packaged are different, the degree of opening of the opening is also different.
As a result, there is a problem that the operation of completely sealing the opening with the flap is poor in workability.

On the other hand, it is conceivable to form a large flap and cover the opening that is about to open with the flap to forcibly seal the opening. However, in such a case, the adhesive positions of the flaps are different for each packaging bag, resulting in a change in the size of the packaged packaging bag, or the flap being distorted, resulting in a poor appearance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a packaging body and a packaging apparatus capable of reliably and easily sealing an insertion opening for an object to be packaged, without impairing its appearance.

A packaging bag according to a first aspect of the present invention includes a rectangular first surface portion and a second surface portion which are formed by folding one sheet and overlapped, and an insertion opening for an object to be packaged opened along one side of the rectangle. A strip-shaped adhesive layer formed along the opening of the insertion port on the bag body facing the second surface portion of the first surface portion, and a band-shaped adhesive layer formed on the bag body along the opening of the insertion port, and the first surface portion continuously connected to the second surface portion. and an ear part that protrudes outward from the edge and can be cut off while the insertion opening is blocked by the adhesive layer.

In a second aspect of the invention, a pair of side edges on the left and right sides of the insertion port are provided with the adhesive layer so that internal stress does not remain in at least one of the first surface portion and the second surface portion when the insertion port is closed by the adhesive layer. A stress relief notch is formed along the side to allow for

In a third aspect of the invention, the adhesive layer is made of an adhesive that exhibits adhesive strength when heated or pressurized.

A packaging device according to a fourth aspect of the invention is a packaging device for packaging an object to be packaged with the packaging bag according to any one of the first to third inventions, comprising: ear pressing means for pressing the ear portions; An opening mechanism that moves away from the second surface to open the insertion opening, and an adhesive layer that seals the insertion opening of the bag body into which the object to be packaged is inserted from the opened insertion opening. A sealing mechanism and a cutting mechanism for cutting off the ear part side from the bag body with the insertion port closed to keep the length along the side edge of the bag body within a specified dimension.

A fifth aspect of the invention is provided with a transport mechanism for transporting the bag body into which the object to be packaged is inserted to the sealing mechanism, and the transport mechanism transports the bag body to the sealing mechanism while holding the vicinity of the pair of sides. A retaining means is provided.

A sixth aspect of the invention provides a pair of clamping members, wherein the sealing mechanism clamps the first surface and the second surface on a plane including the pair of side edges and along the adhesive layer. I have it.

According to the first invention, by pressing the ears of the second surface projecting outside the opening, the insertion port can be easily opened by moving only the first surface. Since the ears of the second surface protrude outward from the first surface, there is no need to insert a holding member or the like into the bag body through the insertion opening to hold the ears, thereby facilitating the opening operation. .
In addition, even if the mating portion of the first surface portion and the second surface portion is displaced or the first surface portion or the second surface portion is loosened when closing the insertion port, the misalignment or loosening can be prevented by cutting the ear portion side. can be made inconspicuous, the outer dimensions of the packaging bag can be adjusted, and the appearance can be adjusted.

According to the second invention, the stress generated when an object to be packaged is inserted and blocks the opening of the bag body can be released by the stress release notch. As a result, when closing the opening, the first surface portion and the second surface portion can be prevented from tearing due to stress.

According to the third invention, the opening can be closed simply by sandwiching the portion corresponding to the adhesive layer without requiring a process such as peeling off the release paper.

According to the fourth invention, the insertion port is easily opened, the bag body into which the object to be packaged is inserted is closed, the ears are cut off, and the length along the side of the bag body is kept within the specified dimension. be able to. The delivery charge can also be saved by matching the specified dimensions with the standard of the delivery charge.
In addition, by cutting off the ear portion side, the outer shape of the packaging bag in which the object to be packaged is packed can be adjusted and the appearance can be maintained.

According to the fifth invention, since the bag body is conveyed to the sealing mechanism while being held in the vicinity of the pair of side edges, the force of clamping the portion corresponding to the adhesive layer acts evenly on the first surface portion and the second surface portion. The first surface part and the second surface part are less likely to be displaced, and the closed packaging bag can be reliably sealed and the appearance of the sealed packaging bag can be made beautiful.

According to the sixth invention, it is possible to further reduce the displacement between the first surface portion and the second surface portion when closing the insertion opening.

FIG. 1 is a plan view of a packaging bag showing one embodiment of the present invention. FIG. 2 is a plan view schematically showing a packaging device using the packaging bag of FIG. 1. FIG. FIG. 3 is a side view of the packaging device of the embodiment. FIG. 4 is a front view of an opening mechanism portion in the packaging device of the embodiment. 5 is a cross-sectional view taken along the line VV of FIG. 3. FIG.

[Embodiment]
Embodiments of the present invention will be described below.
FIG. 1 is a plan view of the packaging bag of the embodiment. 2 to 5 are diagrams showing a packaging apparatus using the packaging bag of FIG. 1. FIG. 2 is a plan view showing an outline of the packaging apparatus, FIG. 3 is a side view of the packaging apparatus, FIG. 4 is a front view of an opening mechanism portion in the packaging apparatus, and FIG. 5 is a cross-sectional view taken along line VV of FIG. be.

A packaging bag 1 shown in FIG. 1 includes a bag body 2 that is formed by folding one cardboard (sheet) into a substantially rectangular shape.
The bag body 2 has a rectangular first surface portion 4 and a rectangular second surface portion 5 separated by a folding line 3, and these first and second surface portions 4 and 5 are overlapped. The side opposite to the folding line 3 is opened as an insertion opening 6 for the article to be packaged, and the left and right sides 7 and 8 of the insertion opening 6 are closed.

In this embodiment, the adhesive strips 5a and 5b continuously formed on the left and right ends of the second surface portion 5 are bent toward the surface side of the first surface portion 4 and covered with the first surface portion 4 to adhere to the side edges. 7 and 8 are blocked. However, the method of blocking the sides 7 and 8 is not limited to this.
In addition, on the sides 7 and 8 on the side of the insertion port 6, notches 7a and 8a for releasing stress, which are continuous with the opening of the insertion port 6, are formed.

A band-shaped adhesive layer 9 along the opening of the insertion port 6 is provided on the surface 4 a of the first surface portion 4 that faces the second surface portion 5 (the back surface of the first surface portion 4 ). The adhesive layer 9 is formed by applying a heat-melt type adhesive that does not exhibit adhesive strength at room temperature and exhibits adhesive strength only when heated.
Further, the second surface portion 5 has an ear portion 10 projecting outward from the edge of the first surface portion 4 along the insertion opening 6 . The ear portion 10 is cut off after the object W is contained in the bag body 2 and the insertion opening 6 is closed.

Next, a packaging device 11 using the packaging bag 1 of FIG. 1 will be described.
The packaging apparatus 11 of the embodiment performs an opening/insertion process A, a sealing/cutting process B, and a discharging process from the upstream side of the conveying direction x along the conveying direction x of the bag body 2 indicated by the arrows in FIGS. C are provided in this order. The dashed-dotted line shown in the drawing is the locus of movement of the center of the bag body 2, and is the conveying path L1 along which the bag body 2 is conveyed. As shown in FIG. 3, the conveying path L1 is arranged with respect to the horizontal plane HP so that the bag body 2 descends from upstream to downstream in the conveying direction x and becomes lower from upstream to downstream in the conveying direction x. is sloping. Here, the center of the bag body 2 lies within a plane including the sides 7 and 8 of the bag body 2 .
2 to 5 are attached to a frame or the like on a base (not shown).

The opening/insertion step A is a step of opening the insertion port 6 of the bag body 2 and inserting the article to be packaged W into the bag body 2 .
In this opening/insertion step A, an ear pressing plate 12 as an ear pressing means is provided on the most upstream side of the conveying path L1. As shown in FIG. 4, the ear pressing plate 12 is formed by bending a rectangular metal plate, and has side portions 12b and 12c that are flipped upward on both sides of a central portion 12a.
The ear pressing plate 12 is fixed below the conveying path L1 as a whole (see FIGS. 3 and 4) so that the central portion 12a is parallel to the conveying path L1.

Further, in the opening/insertion process A, a conveying mechanism is arranged on the downstream side of the conveying path L1 with respect to the ear pressing plate 12. As shown in FIG. The transport mechanism is configured to transport the bag body 2 toward the sealing/cutting process B along the transport path L1. The conveying mechanism comprises a pair of upper rollers 13 and 14 arranged above the conveying path L1 with a gap therebetween in the conveying direction, and a round belt having a circular cross section stretched between the upper rollers 13 and 14. A belt 15 is provided.
The upper rollers 13 and 14 and the upper belt 15 are provided on both left and right sides of the conveying path L1 (see FIG. 4). That is, the upper rollers 13 and 14 and the upper belt 15 are arranged as a pair with the conveying path L1 interposed therebetween.

On the other hand, as a conveying mechanism, lower rollers 18 and 19 and a lower belt 20 stretched between them are provided at a position facing the upper belt 15 below the conveying path L1. The lower belt 20 is a toothed flat belt having a rectangular cross section. These lower rollers 18 and 19 and the lower belt 20 are also provided on both left and right sides of the conveying path L1. That is, the lower rollers 18 and 19 and the lower belt 20 are also arranged as a pair with the conveying path L1 interposed therebetween.

The belts 15 and 20 are driven to convey the bag body 2 while holding the vicinity of the sides 7 and 8 of the bag body 2 between the upper belt 15 and the lower belt 20 . That is, the upper rollers 13, 14 and the upper belt 15, and the lower rollers 18, 19 and the lower belt 20 constitute a conveying mechanism for conveying the bag body 2 into which the article to be packaged W is inserted to the sealing mechanism. Belts 15 and 20 constitute holding means for holding the sides 7 and 8 in the vicinity.

As shown in FIG. 4, the lower rollers 18 and 19 control the support member 41 so that the lower belt 20 and the upper belt 15 move the packaging bag 1 together with the lower belt 20 from the released position indicated by the two-dot chain line. It is made possible to rotate and move to the clamping position indicated by the solid line for clamping.
A compression spring member 17 is attached to the pair of upper rollers 13 and 14 via a support member 16, as shown in FIG. The pair of upper rollers 13 and 14 are configured such that the pressing force of the upper belt 15 acts on the lower belt 20 moved to the nipping position by the compression spring member 17 .

Further, in the opening/insertion process A, a stopper member 25 is provided on the transport path L1 slightly downstream in the transport direction. The stopper member 25 is a member having a length in a direction orthogonal to the conveying path L1, and is driven by a cylinder 26 so as to be able to reciprocate between a position on the conveying path L1 and a retracted position from the conveying path L1. there is

Further, the opening/insertion process A is provided with a support base 21 that allows vertical movement between the pair of left and right lower belts 20 , 20 . A suction cup 22 is provided on the support base 21, and the support base 21 moves upward toward the conveying path L1 while sucking the packaging bag 1 placed thereon.

Further, in the opening/insertion process A, a support member 23 which can move up and down is provided at a position (above) facing the support table 21 with the transport path L1 interposed therebetween. 24, 24 are attached. The support member 23 and the suction cups 24 function as an opening mechanism that sucks and pulls up the first surface portion 4 of the bag body 2 sandwiched between the upper belt 15 and the lower belt 20 to open the insertion opening 6 .
The upper and lower suction cups 22 and 24 are connected to suction means (not shown), respectively, and exert a suction force as necessary.

Next, the sealing/cutting step B will be described.
The sealing/cutting process B is provided with a safety cover 27, a cutting mechanism b1, and a sealing mechanism b2 from the upstream side along the conveying path L1.

The safety cover 27 is a member that has a width in the left-right direction and a length in a direction orthogonal to the conveying path L1, and is movable with respect to the conveying path L1 by an actuator (not shown). In the initial state, the safety cover 27 blocks the conveying path L1 at the cover position indicated by the solid line, and covers the tips of the upper and lower blades 29, 30 of the cutting mechanism b1. The safety cover 27 moves to the retracted position indicated by the two-dot chain line when the bag body 2 is conveyed to the cutting mechanism b1.
An air tube 28 extending in the longitudinal direction (horizontal direction) of the safety cover 27 is fixed to the side of the cutting mechanism b1. The air tube 28 is formed with an injection port (small hole) for injecting air toward the vicinity of the conveying path L1 in the cutting mechanism b1. A plurality of injection ports are formed at regular intervals in the longitudinal direction of the air tube 28 . This air tube 28 is connected to an air source (not shown).

The cutting mechanism b1 is provided with upper and lower blades 29 and 30 facing each other across the conveying path L1 and having a length equal to or greater than the width of the bag body 2 (the sides along the opening of the insertion port 6). Both the upper blade 29 and the lower blade 30 are erected perpendicularly to the conveying path L1 and are vertically movable by an actuator (not shown). The cutting edges of the upper and lower blades 29 and 30 cross each other along the conveying path L1, thereby cutting the bag body 2. As shown in FIG.

A seal mechanism b2 is provided adjacent to the upper and lower blades 29, 30 downstream of the upper and lower blades 29, 30 in the transport path L1. The sealing mechanism b2 includes a heat bar 31 which incorporates a heating wire and is arranged above the conveying path L1 and is vertically movable, and is arranged below the conveying path L1 and faces the heat bar 31 via the conveying path L1. It is composed of a cradle 32 for The heat bar 31 and the cradle 32 have a length equal to or greater than the width of the bag body 2, like the lower blade 30 described above. However, the heat bar 31 only needs to have a length corresponding to the adhesive layer 9 provided on the facing surface 4 a of the first surface portion 4 .
On the other hand, the cradle 32 is held by a holder 33 together with the lower blade 30, and the lower blade 30, the heat bar 31 and the holder 33 are integrally moved up and down by an actuator (not shown).

In the sealing mechanism b2, an upper pressing member 34 is provided above the transport path L1 and adjacent to the heat bar 31 on the downstream side of the transport path L1 with respect to the heat bar 31. As shown in FIG. The cradle 32 is located at a position facing the upper pressing member 34 across the conveying path L1. The upper pressing member 34 is vertically movable by an actuator (not shown), and functions as a clamping member that clamps a position along the adhesive layer 9 together with the cradle 32 . Therefore, the upper pressing member 34 also needs to be longer than the width of the bag body 2 .

Further, the discharge process C provided on the downstream side of the conveying path L1 with respect to the sealing/cutting process B includes upper rollers 35 and 36 and an upper belt 37 provided on both left and right sides of the conveying path L1, and lower rollers. 38, 39 and a lower belt 40 are provided. These are provided on the extension line of the conveying mechanism provided in the opening/insertion process A. The upper belt 37 is a round belt, and the lower belt 40 is a toothed flat belt. That is, the joint portion between the upper belt 15 and the lower belt 20 of the conveying mechanism and the joint portion between the upper belt 37 and the lower belt 40 in the discharge process C are positioned on the same plane, and this same plane is the conveying path. It will contain L1.

The reason why the upper belts 15 and 37 are round belts and the lower belts 20 and 40 are flat belts is to secure the pinching force by the upper and lower belts. As shown in FIG. 5, when the upper belt 15 of the round belt is pressed against the lower belt 20 of the flat belt, the pressing force acts while allowing some deviation of the bag body 2 rather than when the flat surfaces are pressed against each other. because it is easy to

[Action, effect, etc.]
A procedure for packaging the object W to be packaged in the packaging bag 1 by the packaging apparatus 11 will be described.
An unused bag body 2 is conveyed (supplied) onto the support base 21 along the arrow y in FIG. The bag body 2 may be conveyed by any conveying means such as a belt conveyor or hand-held conveyance.
However, the bag body 2 on the support base 21 must be placed on the support base 21 so that only the ear portions 10 are caught by the ear pressing plates 12 when the support base 21 is raised. be.

When the bag body 2 is supplied onto the support base 21, the packaging device 11 starts operating, and each operation described below is controlled by a controller (not shown).
At the timing when the bag body 2 is placed on the support stand 21, the suction means connected to the suction cups 22 is operated to exert the suction force of the suction cups 22.例文帳に追加The support base 21 moves upward toward the conveying path L1 while the position of the bag body 2 is fixed by the suction cups 22 .

When the support base 21 is lifted and the tabs 10 of the bag body 2 are lifted to the position where they abut against the tabs 12, as shown in FIG. move towards During the movement of the lower rollers 18 and 19, the suction force of the suction cups 22 is released, and the support base 21 descends. The bag body 2 released from the support base 21 is pushed up to the position of the conveying path L1 by the lower rollers 18 and 19, and the vicinity of the sides 7 and 8 of the bag body 2 is clamped by the upper and lower belts 15 and 20. As shown in FIG.
When the bag body 2 is conveyed until it coincides with the conveying path L1, the stopper member 25 is moved to the conveying path L1 to support the end portion of the bag body 2. As shown in FIG.

At the same time that the vicinity of the side edges 7 and 8 of the bag body 2 is clamped, the upper suction cup 24 is lowered by the support member 23, is attracted to the first surface portion 4, and the support member 23 is raised and pulled up. By pulling up the first surface portion 4 while the ear portions 10 of the second surface portion 5 are pressed by the ear pressing plate 12, the insertion opening 6 of the bag body 2 is opened. Thus, the ear pressing plate 12 and the suction cups 24 that move up and down constitute an opening mechanism.

After opening the insertion port 6 as described above, an operator or an insertion device inserts the object to be packaged W (see FIG. 2) into the bag body 2 . In this embodiment, since the conveying path L1 is inclined, the insertion port 6 opens upward. Therefore, there is an advantage that the article to be packaged W can be easily inserted into the bag body 2 .

When the object to be packaged W is inserted into the bag body 2, the suction force of the suction cups 22 and 24 is released, the support table 21 is lowered to its original position, and the support member 23 is also raised to its original position. At the same time, the conveying mechanism of the opening/inserting process A is driven to convey the bag body 2 sandwiched between the upper belt 15 and the lower belt 20 to the sealing/cutting process B. As shown in FIG.
In the sealing/cutting process B, when the transport mechanism is driven, the stopper member 25 and the safety cover 27 are retracted from the transport path L1 to the retracted positions. After the bag body 2 has passed, the safety cover 27 is returned to its initial position.

The bag body 2 conveyed to the sealing/cutting process B is clamped by the upper belt 37 and the lower belt 40 driven in the discharging process C at the upstream portions of the sides 7 and 8, and the vicinity of the insertion opening 6 is sealed. It is transported until it reaches mechanism b2. When the bag body 2 is conveyed to the target position, the upper belt 37 and the lower belt 40 are stopped.

When the bag body 2 stops at the target position, the holder 33 is lifted from below the conveying path L1 to align the upper surface of the cradle 32 with the conveying path L1. Substantially simultaneously with this, the upper pressing member 34 descends to press the vicinity of the opening of the bag body 2 . At this time, the portion sandwiched between the upper pressing member 34 and the cradle 32 is the portion of the bag body 2 closer to the main body than the adhesive layer 9 , that is, the portion away from the ear portion 10 .

At this time, the surface sandwiched between the upper pressing member 34 and the cradle 32 is a plane that includes the pair of side edges 7 and 8 of the bag body 2 together with the conveying path L1. Therefore, the upper pressing member 34 and the cradle 32 sandwich the first surface portion 4 and the second surface portion 5 at a position along the adhesive layer 9 on a plane including the pair of side edges 7 and 8 in the sealing mechanism b2. It is a sandwiching member.
When the vicinity of the insertion port 6 is clamped in this manner, the heat bar 31 descends to heat the portion corresponding to the adhesive layer 9 provided on the facing surface 4 a of the first surface portion 4 , so that the heat bar 31 removes the adhesive layer 9 . The opening of the insertion port 6 is closed by melting.

When the opening of the insertion port 6 is blocked, the heat bar 31 returns to the original position shown in the drawing, and air is jetted from the air tube 28 fixed to the safety cover 27 to the vicinity of the blocked opening of the bag body 2 to apply the adhesive. is cured, the upper blade 29 of the cutting mechanism b1 is lowered. The upper blade 29 and the lower blade 30 intersect to cut off the ear part 10 side of the bag body 2.例文帳に追加Although only the ear portion 10 may be cut off in this step, the ear portion 10 and its vicinity may be cut off, and the portion including the adhesive layer 9 and the ends of the first and second surface portions 4 and 5 may also be cut off. By cutting the ear portion 10 in this way, the outer periphery of the bag body 2 can be straightened by removing the portion that is distorted and shifted when the insertion port 6 is closed.

After cutting the ear portion 10 side, the upper blade 29 and the holder 33 are returned to their original positions, and the upper belt 37 and the lower belt 40 in the discharge step C are driven again to convey the bag body 2 with the insertion opening 6 closed. , is discharged out of the device.

In the packaging apparatus 11 as described above, the insertion opening 6 can be opened by pressing the ear portion 10 with the ear pressing plate 12 by lifting the bag body 2 from below. Therefore, it is not necessary to insert a pressing member into the bag body 2 in order to open the insertion port 6 . In this embodiment, since there is no need to insert a member into the insertion opening 6 where the first surface portion 4 and the second surface portion 5 are in contact with each other and overlap each other, the opening operation can be performed efficiently.
Further, since the second surface portion 5 is pressed by the ear pressing plate 12, the insertion opening 6 can be opened only by sucking and moving only the first surface portion 4. - 特許庁

In addition, since the bag body 2 has notches 7a and 8a for releasing stress along the sides 7 and 8, stress is generated when closing the opening of the bag body 2 that has been deformed by inserting the object W to be packaged. The cuts 7a and 8a can release the internal stress of the bag body 2 (especially the vicinity of its sealing portion). As a result, when closing the opening, the first surface portion 4 and the second surface portion 5 can be prevented from being distorted or torn due to stress.
Furthermore, when the insertion port 6 is opened, the stress generated in the vicinity of the insertion port 6 in the bag body 2 can be released by the cuts 7a and 8a, so that the sides 7 and 8 can be prevented from tearing. .

Further, since the adhesive layer 9 is of a heat-melt type that does not exert its adhesive force until it is heated, it is not necessary to provide a release paper or the like on the facing surface 4a. Therefore, there is no need to remove the release paper during packaging. As the adhesive layer that does not require a release paper, a heat-melting adhesive or a pressure-sensitive adhesive that exerts adhesive force under pressure may be used.
Since the adhesive layer 9 is provided on the inner facing surface 4a of the bag body 2, the insertion opening 6 can be closed simply by holding and heating the first and second surface portions 4 and 5, for example, by folding the flap. A process such as blocking by means of a

Furthermore, in this embodiment, the lengths of the sides 7 and 8 can be kept within the specified dimensions by cutting off the ear portion 10 side after the insertion port 6 is closed. You can save on shipping costs by matching the specified dimensions to the shipping rate standards.
Further, by cutting off the ear portion 10 side, the edge on the ear portion 10 side can be kept straight. When the object to be packaged W is inserted between the first surface portion 4 and the second surface portion 5, the respective surface portions 4 and 5 are deformed and the sides along the opening of the insertion port 6 are distorted and blocked. By cutting off the part 10 side and making it straight, the appearance of the packaging bag 1 can be kept beautiful.

In the packaging apparatus of this embodiment, the bag body 2 is conveyed to the sealing mechanism while the vicinity of the sides 7 and 8 of the bag body 2 is sandwiched between the upper belt 15 and the lower belt 20, and the bag body is held by the upper and lower belts 37 and 40. 2. Since the heat bar 31 and the cradle 32 are sandwiched from above and below, the pressing force acting from above and below is made almost uniform, the first and second surfaces 4 and 5 are less likely to shift, and the distortion of the bag body 2 is reduced. can do.
In the above embodiment, since the first surface portion 4 and the second surface portion 5 are sandwiched between the cradle 32 and the upper pressing member 34 before being sandwiched between the cradle 32 and the heat bar 31, the insertion opening 6 is It is possible to make it more difficult for the first and second surface portions 4 and 5 to slip when closed.

In the above-described embodiment, the cradle 32 and the upper pressing member 34 sandwich the first surface portion and the second surface portion at positions along the adhesive layer on a plane including the pair of side sides in the sealing mechanism. However, the heat bar 31 can also serve as the holding member and the upper pressing member 34 can be omitted.
In addition, the lower blade 30 and the cradle 32 are held by the holder 33 so as to move up and down integrally. good too.

In addition, although the transport path L1 is inclined with respect to the horizontal plane in the above-described embodiment, the transport path L1 does not necessarily have to be inclined. As described above, if it is lowered from upstream to downstream, the insertion port 6 is opened upward in the opening/insertion process A, which facilitates manual insertion of the article W to be packaged. When an inserting means for automatically inserting the article to be packaged W is provided, the conveying path L1 may be aligned with the inserting means, and may be horizontal, for example.

It is possible to improve the workability of packaging relatively small objects.

1 Packaging bag 2 Bag main body 4 First surface 4a Opposing surface 5 Second surface 6 Insertion openings 7, 8 Sides 7a, 8a (for stress release) Notch 9 Adhesive layer 10 Ear 11 Packaging device 12 (Opening mechanism) Ear retainer Plates 13, 14 Upper roller 15 (Holding means) Upper belts 18, 19 Lower roller 20 (Holding means) Lower belt 24 (Opening mechanism) Suction cup 29 (Cut mechanism) Upper blade 30 (Cut mechanism) Lower blade 31 (Seal mechanism) Heat bar 32 (Holding member) Receptacle 34 (Holding member) Upper pressing member b1 Cutting mechanism b2 Sealing mechanism L1 Conveyance path A Opening insertion process B Sealing/cutting process C Discharging process HP Horizontal surface

Claims (6)

A bag body provided with a first and second rectangular surface portions that are overlapped by folding one sheet, and an insertion opening for an object to be packaged opened along one side of the rectangular shape,
a band-shaped adhesive layer formed along the opening of the insertion port on the surface of the first surface portion facing the second surface portion;
A packaging bag comprising an ear portion which is connected to the second surface portion, protrudes outward from the edge of the first surface portion, and which can be cut off with the insertion opening closed by the adhesive layer. A pair of side edges on the left and right sides of the insertion opening are provided with stress relief for preventing internal stress from remaining in at least one of the first surface portion and the second surface portion when the insertion opening is closed by the adhesive layer. 2. The packaging bag according to claim 1, wherein a notch for the purpose is formed along said side edge. 3. The packaging bag according to claim 1 or 2, wherein the adhesive layer is made of an adhesive that exhibits adhesive strength when heated or pressed. A packaging device for packaging an object to be packaged with the packaging bag according to any one of claims 1 to 3,
ear pressing means for pressing the ear;
an opening mechanism that moves the first surface portion in a direction away from the second surface portion to open the insertion opening;
a sealing mechanism for sealing the insertion opening of the bag body into which the object to be packaged is inserted from the open insertion opening with the adhesive layer;
a cutting mechanism for cutting off the ear portion side from the bag body with the insertion port closed and keeping the length along the side edge of the bag body within a specified dimension. A conveying mechanism for conveying the bag body into which the object to be packaged is inserted to the sealing mechanism,
5. The packaging apparatus according to claim 4, wherein the conveying mechanism comprises holding means for conveying to the sealing mechanism while holding the vicinity of the pair of side edges. 6. The sealing mechanism according to claim 4 or 5, comprising a pair of clamping members that clamp the first surface portion and the second surface portion on a plane including the pair of side sides and along the adhesive layer. A packaging device as described.

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