JP2015224049A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag in which, a folding planned part is provided so as to cross a stored object pouring path extending to a bag upper part and a wide surface seal thin plate disposed in parallel to the stored object pouring path and extending to seal parts on bag side parts and the bag upper part, an engagement state in which engaged parts are engaged by folding the packaging bag at the folding planned part is more secured, and even when the folded packaging bag is handled carelessly, closing of the stored object pouring path is maintained in a state that the packaging bag is still folded.SOLUTION: A seal thin plate 13 comprises folding maintenance means 16 for maintaining a folded state of the bag at a folding planned part 14, the folding maintenance means 16 is formed of a pair of engaged parts 17, 18 which faces each other when the bag is folded at the folding planned part 14 and which can engage each other. The respective positions of the engaged parts 17, 18 are on a straight line orthogonal to the folding planned part 14.

Description

  The present invention is a packaging bag for storing liquids such as shampoos, rinses, detergents, and powdered foods such as seasonings and instant coffee, and can be easily resealed after opening the spout. The present invention relates to a packaging bag that can prevent leakage of stored items.

  Conventionally, as a packaging bag using a flexible sheet as a packaging material, pillow packaging with heat-sealed bag top and bottom of the back-bonded trunk, folding the sheet in half and stacking the front sheet and the back sheet In addition to heat-sealing on the opposite side of the sheet folding side, three-side seal packaging with heat-sealing the top and bottom of the bag, and separately formed front and back sheets are placed facing each other, left and right There are various types such as four-side seal packaging in which the four sides of the bag side portion, the bag upper portion, and the bag lower portion are heat sealed.

  Of these packaging forms, liquids such as shampoos, rinses, and detergents, seasonings, and powders such as instant coffee are filled and packaged. When used, the upper corners of the bags are cut and opened. Packaging bags with three-side seals or four-side seals are often used to pour out stored items from the outlets. For a packaging bag with a three-side seal or four-side seal to form a storage portion between the front sheet and the back sheet, the storage portion is not poured out from the spout opening at the top corner of the bag. There was a demand to easily re-seal the stored items so that the stored items do not leak when the stored items are left.

  As a packaging bag which answers such a request, for example, as shown in Patent Document 1, a convex article discharge path is formed with a constant passage width toward the upper part of the bag, and this is formed into a bag side part. The side portion of the storage portion extraction path is biased to the side, and a seal sheet in which the front sheet and the back sheet are heat-sealed and provided with a sheet-like wide seal thin plate, There is a packaging bag in which sheet sheets are arranged in the bag width direction. In this packaging bag, the portion on the tip side where the opening portion of the stored item pouring path is to be separated from the seal thin plate can be separated, and a slit is cut in the seal thin plate near the side of the stored item pouring path. It is included.

  And in order to pour out the stored item, the tip side of the stored item pouring path is cut out to form a spout, and when resealing, the leading end side of the stored item pouring path is separated from the seal thin plate And then re-sealing so that the stored item pouring path is closed at the bent portion by inserting and hooking into the slit while bending the tip end portion (spout outlet side portion). It was. Similarly, Patent Documents 2 and 3 also devise a method of bending the stored item extraction path and passing the leading end portion of the stored item extraction path through the slit or latching it.

  Moreover, in the packaging bag which can be opened widely across the bag width direction at the bag upper part, the bag upper part side so that the stored item does not leak from the opening after opening, rather than the form in which the item pouring path is biased toward the bag side. There has also been proposed a contrivance that bends and maintains the bent state. For example, as disclosed in Patent Documents 4 to 7, a configuration has been proposed in which the bag side seal portions can be engaged with each other at portions facing each other when the bag is folded.

  Furthermore, in order to improve the opening and closing function of the one side open bag body which is a normal form, a wire rod which can be bent and stretched is assembled to a required portion, and the closed state can be easily changed by deformation of the wire rod. Patent document 8 discloses a bag that is maintained so as to facilitate a closing operation and an opening operation.

Microfilm of actual application No.59-193491 (open utility Showa 61-107741) JP 05-178356 A JP 2001-151250 A Utility Model Registration No. 3004090 JP 2006-199334 A JP 2006-240991 A JP 2012-148784 A Utility Model Registration No. 3047802

  In the type of packaging bag that opens by cutting the upper side of the bag in the full width direction in the bag width direction, since the opened portion extends over the full width of the bag, it is difficult to carry out an operation for pouring out a desired amount of stored items. is there. Further, since the wide storage portion is bent over its entire width and resealed, the bent portion becomes long, and the degree of blockage at the bent portion tends to be weakened.

  On the other hand, in the packaging bag having the above-mentioned stored item dispensing path, first of all, the width of the opening through which the stored item is discharged is fixed, and it is easy to stably put out the stored item, and it is easy to take out a desired amount of stored item. There is an advantage, and it is suitable for a packaging bag for the purpose of flowing out a desired amount of stored items. However, when resealing, there is a problem in that the re-sealing operation becomes complicated because the stored part extraction path itself is directly held by a fingertip, bent, inserted into the slit, and engaged.

  Even in the proposal of a bag that can be closed and maintained by assembling a wire material that can be bent and stretched, the member that can be bent and stretched must be fused to the bag body, which makes the manufacturing of the bag complicated. In addition, there is also a problem that the tightening of the closed part becomes uncertain depending on the control.

  In the present inventor, a folding scheduled portion across the bag width direction is set so as to cross a portion of the packaging bag where the stored item extraction path is located, and the packaging bag is bent at the position of the planned folding portion. At times, the opposing heat seal portions are each provided with an engaging portion formed by cutting out or cutting the heat seal portion, and the packaging bag can be folded at the planned folding portion by simply engaging the engaging portions. We focused on the fact that it is possible to close the contained material extraction path by bending, and to remove the engagement state of the locking portion is easy.

  And about the packaging bag with the contents which the latching parts are engaged and folded at the planned folding part, and the stored item extraction path is closed by the folding, there is an inadvertent external force on the storing part at the time of handling. When added, it came to discover that there is a difference in the degree of maintaining the bending depending on the position of both locking portions in the direction along the planned bending portion. In other words, when the function of the planned bending portion is properly exhibited and the bending is maintained (the closure of the stored item extraction path is maintained due to the bending), the function of the planned bending portion is difficult to exhibit and the bending is sharp. If the angle does not become an angle (the closing of the stored item pouring path becomes incomplete), the function of the planned bending portion is not exhibited, and the bent portion is opened by the application of the external force, and the engagement between the locking portions is There was a case where it would come off.

  Therefore, the present invention has a plan to bend so as to cross the stored item pouring path leading to the upper part of the bag and the wide seal thin plate provided in parallel with the upper part of the bag and the sealing part of the side of the bag. In the provided packaging bag, it is an object to make the engagement state in which the folding bag is folded at the planned folding portion and the locking portions are hooked together to make the folded state more reliable. It is an object of the present invention to provide a packaging bag in which the packaging bag remains in a folded state even when it is prepared for handling and the closure of the stored item pouring path is maintained.

(Invention of Claim 1)
The present invention has been made in consideration of the above problems, and is a packaging bag in which a front sheet and a back sheet face each other and a storage section is provided therebetween, at least a bag upper part, a bag lower part, and one bag side part. Is a seal portion formed by heat-sealing the front sheet and the back sheet, and the storage portion is continuously connected to the storage portion pouring path extending from the storage portion toward the upper portion of the bag. In the packaging bag in which the upper end portion of the material pouring path is set as the spout forming portion,
The spout forming part is provided only on the bag upper corner side opposite to the one bag side part,
The stored item extraction path connected to the portion for forming the spout is formed so as to be biased toward the other bag side opposite to the one bag side, and the front sheet and the back sheet are heat sealed. A seal thin plate that is a wide-surface seal portion that reaches the seal portion between the one bag side portion and the bag upper portion is formed, and the stored item pouring path and the seal thin plate are arranged in parallel in the bag width direction. And
The stored item dispensing path is provided so as to be able to be closed by folding the bag at the planned folding portion at a position across the bag width direction across the dispensing path forming portion and the seal thin plate,
The seal thin plate is provided with a folding maintenance means for maintaining the folded state of the bag at the planned folding portion,
The folding maintenance means comprises a pair of locking portions that can be engaged with each other when the bag is folded at the planned folding portion,
Provided is a packaging bag characterized in that the position of each of the locking portions is on the same straight line orthogonal to the planned bending portion, and solves the above problems.

(Invention of Claim 2)
In the present invention, it is preferable that the front sheet and the back sheet are sheets having barrier properties and have a function to prevent deterioration of stored items.

(Invention of Claim 3)
Further, in the present invention, the front sheet and the back sheet are formed on at least one surface of the synthetic resin base material layer, a vapor-deposited thin film layer which is a metal or an inorganic oxide or a mixture thereof, a water-soluble polymer and one or more alkoxides. It is also preferable that the sheet is formed using a coating layer composed of a coating agent mainly composed of an aqueous solution containing at least one of its hydrolyzate or tin chloride, or a water / alcohol mixed solution.

(Invention of Claim 4)
In the present invention, the front sheet and the back sheet are preferably laminated sheets each having an aluminum foil layer in the layer structure.

(Effect of the invention of claim 1)
According to the invention of claim 1, each of the locking portions is provided on the same straight line orthogonal to the planned bending portion, and the actual folding position and the planned bending portion are obtained by engaging the locking portions. Overlap. And the bending plan part in the stored item extraction path of a planned bending part will be folded appropriately, and will be in the state which closes the stored item extraction path. Therefore, careless handling is performed on the storage part with the contents, and external force is applied in the facing direction between the front sheet and the back sheet (not excessive force but force generated by careless handling). Even when the internal pressure increases, the stored item extraction path is folded and closed at the position of the planned bending portion, so that the movement of the stored item can be stopped at the closed portion formed by the folding. Therefore, it does not occur that the latching portions are disengaged and the folded portion is opened at the stored item extraction path so that the stored item leaks from the stored item extraction path.

(Effect of the invention of claim 2)
According to the invention of claim 2, since it is a packaging bag that can be simply opened and closed, it has a function to prevent deterioration of stored items. Products that can be stored in different types of bottles can be stored, and packaging bags with a wide range of use can be obtained.

(Effect of the invention of claim 3)
According to the invention of claim 3, a packaging bag having an excellent gas barrier property and a function of preventing deterioration of stored items can be obtained.

(Effect of the invention of claim 4)
According to the invention of claim 4, a packaging bag having excellent light-shielding properties and having a function of preventing deterioration of stored items, and the shape of the bent portion can be more easily maintained can be obtained.

It is explanatory drawing which shows the example of implementation of the packaging bag which concerns on this invention. It is explanatory drawing which shows the state which opened the bag in the Example, engaged the engaging part, and bent the bag upper part. It is explanatory drawing which shows the position of the upper and lower latching | locking parts in an experiment.

  Next, the present invention will be described in detail based on the embodiment shown in FIGS. In the figure, reference numeral 1 denotes a packaging bag. The packaging bag 1 has a front sheet 2 and a back sheet 3 facing each other, and a storage section 4 is provided between the front sheet 2 and the back sheet 3. And has a rectangular shape. The bag upper portion 5, the bag lower portion 6, and the left bag side portion 7 are provided with a seal portion 9, and the upper and lower left seal portion 9 and the folded portion constituting the right bag side portion 8 constitute the storage portion 4. It is the bag of the three-way seal form enclosed.

  Specifically, in the case of the packaging bag 1 in this embodiment, one sheet is folded in two so that the front sheet 2 and the back sheet 3 face each other, and the two folded sheets are obtained. In the state, the upper bag side, the lower bag side, and the left bag side are heat-sealed to form a three-side seal portion 9, and the overall shape in a front view when the front sheet 2 is viewed from the front is a vertically long rectangle Yes. (Figure 1)

(Manufacture of packaging bags)
When manufacturing the packaging bag 1, for example, a belt-like sheet drawn from a roll body is folded in two and sent vertically downward, and for each bag of the packaging bag in the belt-like sheet, The two parts (for example, the upper part of the bag and the side of the bag opposite to the folded part) are heat-sealed in a state where the part to be left is left. The front sheet 2 and the back sheet 3 are made of a laminate film having at least a base material and a sealant layer so as to be suitable for the heat seal, and the heat seal is performed by overlapping the sealant layers facing each other.

  Then, a nozzle is inserted from above into a filling port for each bag (for example, a portion that becomes the seal portion 9 of the bag lower portion 5) in a continuous body that moves vertically and downward, and the storage portion is filled with liquid or powder, When the filling is completed, the filling port is heat-sealed to close the storage part, and the continuous bag is cut between the bags so that the storage part is filled with a fixed amount of storage. Can be obtained for each bag. By this heat sealing, a storage portion having a pouring path for pouring stored items is formed as will be described later, and the heat sealing portion of the storage bag can be cut or cut off to perform engagement described later. Such a portion can be formed. In addition, manufacture of a packaging bag is not limited to the above-mentioned method, A well-known method can be employ | adopted.

(Containment extraction path)
The packaging bag 1 has a stored item extraction path 10. The stored item extraction path 10 is continuous with the storage portion 4 and extends from the storage portion 4 toward the bag upper portion 5. As shown in the drawing, the stored item extraction path 10 is tapered to have a substantially pointed shape that protrudes upward while extending the upper portion of the storage unit 4 upward, and on the other bag side 8 side. It is biased and formed in a substantially triangular shape when viewed from the front. Further, the upper end portion of the stored item extraction path 10 is a spout formation scheduled portion 11. Thus, the said spout formation part 11 is provided only in the bag upper corner part side which is the other bag side part 8 side.

  The said spout formation part 11 is a part which obtains a spout by removing the front-end | tip part of the stored article extraction path 10 with the seal part 9 which adjoins the front-end | tip part, and the user who opens a packaging bag visually In order to facilitate confirmation of the cutting position, the spout formation scheduled portion 11 is shown as a print instruction line or the like that crosses the leading end portion of the stored item discharge passage 10 in the bag width direction. Moreover, about this spout formation scheduled part 11, the half cut by laser irradiation is given to the surface side of the front sheet | seat 2 and the back sheet | seat 3, or the surface side of one sheet | seat so that it may cut easily by manual operation. Is also possible.

  In the embodiment, the seal boundary portion 12 on the one bag side portion 7 side of the stored item extraction passage 10 is formed into an inclined linear shape. Therefore, the stored item extraction path 10 is formed as a passage having both sides of an inclined seal boundary portion on one bag side portion 7 side and a vertical folding portion on the other bag side portion 8 side. Then, on the side that is the side of one bag side portion 7 of the stored item extraction path 10 with the linear seal boundary portion 12 in between, the seal portion 9 and the bag lower portion 6 on the left side of the storage portion 4 are provided. There is a wide seal portion 9 which is wider than the seal portion 9.

(Seal sheet)
The wide and wide sealing portion 9 is, of course, a portion formed by heat-sealing the front sheet 2 and the back sheet 3, and forms a plate-like sealing thin plate 13 having a spread as a surface. As shown in FIG. 1, the stored item extraction path 10 and the wide and wide plate-like seal thin plate 13 are arranged side by side in the bag width direction. By making the layout into a triangular shape that is reversely oriented, and the portion of the container pouring path 10 that is triangular and has a convex shape that is convex upward, and the portion of this seal thin plate 13 are arranged side by side in the bag width direction. The entire bag 1 is set in a rectangular shape.

(Folding scheduled part)
As described above, the storage portion extraction path 10 and the seal thin plate 13 of the seal portion 9 arranged in the positional relationship in the bag width direction on the bag upper portion 5 side are provided with the planned bending portion 14 extending in the bag width direction. . The said bending plan part 14 is a part which bends the bag upper part 5 toward the downward direction. In this example, the part which crosses the range of the stored article extraction path 10 and the part which crosses the range of the seal thin plate 13 of the seal part 9 Are set at a height position passing through a substantially central portion in the bag height direction of the stored article extraction path 10 so as to have substantially the same length.

  The bent portion 14 is straight, and the bag upper portion 5 is bent at the position of the bent portion 14 so that the inner surfaces of the front sheet 2 and the back sheet 3 in the stored article extraction path 10 are aligned with each other. It is provided so that the folded portion of the bag is in close contact with each other, and the stored item extraction path 10 is closed at the folded portion of the bag. It is possible to provide a print instruction line at the position of the planned bending portion 14, which makes it easy to confirm the position of folding the bag.

  In addition, although the bending plan part 14 is shown as a straight line of a dashed-dotted line in the figure, it is only necessary that the stored item extraction path 10 is closed by folding the bag. If it is bent and folded so that a small arc can be formed with a vertical cross-sectional shape at the position 14, the front sheet 2 and the back sheet 3 will be in relatively close contact with each other, and in the range in which a filled packaging bag is normally handled The stored item does not pass through the bent portion.

  Therefore, it is not particularly necessary for the bent portion 14 to be bent to have a cross-sectional shape in which the cross-section is sharply cut. In this example, folding is performed at the position of the planned folding portion 14 of the bag, so that the cross-section of the folded portion at the planned folding portion 14 in the stored article extraction path 10 is in a state of presenting a small arc. In this state, the stored item extraction path 10 is closed.

(Folding maintenance means)
The seal thin plate 13 is provided with a folding maintaining means 16 for maintaining the folded state of the bag at the planned folding portion 14. The folding maintaining means 16 is provided on the side of one bag side portion 7 on the seal thin plate 13, and a pair of pairs provided at opposite positions when the seal thin plate 13 is bent at the planned folding portion 14 respectively. The locking portions 17 and 18 are provided, and the locking portions 17 and the locking portions 18 are provided so as to be able to engage with each other.

(Locking part)
As shown in FIG. 1, the locking portion 17 is a base end edge of a tongue piece formed by incision by a notch that is inserted so as to reach the outer edge of the bag upper portion 5 (upper edge of the bag). The tip of the notch for forming the locking portion 17 is extended in an arc shape at the base end portion of the locking piece to prevent tearing, but the portion of the locking portion 17 is one bag side portion. This is the position closest to the outer edge of 7 (left bag side). The tip of the notch is extended so as to be directed toward the other bag side 8 (right bag side), so that the tear is prevented. This tear-proofing process is not necessarily required. In addition, the tear-proofing process can be a small hole that penetrates the sheet.

  The other locking portion 18 is a lower portion of the seal thin plate 13 and is a cut recess formed so as to obtain a tongue piece by a cut formed so as to reach the side edge of one bag side portion 7. It is. The tip of the notch for forming the locking part 18 is extended toward the bag upper part 5 side so that the notch recess is arcuate in order to prevent tearing. Is the position farthest from the outer edge of one bag side 7. The tip of the cut is extended and directed toward the upper part of the bag to prevent tearing. The tearing treatment is not necessarily required, and the tearing treatment may be a small hole through the sheet.

  By folding the bag and engaging the locking portions 17 and 18 together, the folded state of the bag is maintained, whereby the closed state of the stored item dispensing path 10 is maintained. Further, when the engagement relationship between the locking portion 17 and the locking portion 18 is released, the bag upper portion 5 comes to rise due to the restoring force generated at the bag folding portion between the front sheet 2 and the back sheet 3, and the stored items. The extraction path 10 is not blocked.

(Open spout)
In the packaging bag 1, the device which makes it easy to form the spout which pours out the stored item from the stored item extraction path 10 is provided. In other words, a device is provided to facilitate cutting along the position of the spout formation scheduled portion 11 at the distal end portion of the stored item pouring path 10 by manual operation. First, in the center of the bag upper portion 5, there is a vertical cut line portion 19 formed of a discontinuous slit that extends downward from the upper edge of the bag upper portion and then bends along the vicinity of the seal boundary portion 12. Further, there is an inclined cut line portion 20 formed of a slit that is continuous with the other end of the vertical cut line portion 19 and is parallel to the seal boundary portion 12 and reaches the end portion of the spout formation portion 11. .

  The other bag in the bag width direction is gripped while holding a tongue-like portion formed by cutting the connecting portion (between the slit and the slit) from the vertical cut line portion 19 to the inclined cut line portion 20. By pulling toward the side portion 8 side, the spout forming portion 11 is torn and the spout 21 is easily formed. (See Figure 2)

  In order to close the stored article extraction path 10 opened as described above, the bag is folded from the position of the planned folding portion 14 as shown in FIG. 18 can be engaged, and the operation of closing the stored item extraction path 10 can be simplified. In particular, the portion of the locking portion 17 of the bending maintaining means 16 is in a positional relationship in which it is spaced from the spout and in the bag width direction, so that bending and latching operations with the portion of the locking portion 17 are performed. The stored items attached as residues around the spout are prevented from soiling the fingertips.

  The packaging bag 1 is devised so that the folding operation can be performed more easily by reducing the resistance to the folding operation.

  Specifically, a bending auxiliary portion 22 is provided at the position of the planned bending portion 14. As shown in the figure, within the range on the seal thin plate 13 and in close proximity without reaching the position of the seal boundary portion 12, discontinuous slits that penetrate the seal thin plate 13, front and back surfaces of the seal thin plate 13 (front sheet and front sheet) At least one of the outer surfaces of the back sheet) is provided with a bending assisting portion 22 made of a half cut inserted by laser irradiation.

  Moreover, about the part of the articles | goods extraction path | route 10, the bending assistance part which consists of the half cut put by embossing and the outer surface of a front sheet | seat and a back sheet | seat by laser irradiation is provided along the position of the bending plan part 14. It is also possible to do so. Both folding assisting portions facilitate the folding of the bag. In addition, what consists of a half cut of laser irradiation can also be formed continuously in the bag width direction.

  As described above, in the packaging bag 1 according to the present embodiment, the folding auxiliary portion 22 is provided in the planned folding portion 14 in the range of the seal thin plate 13, so that the bag is bent at the position of the planned folding portion 14. When the bag is folded, the cross-section of the folded portion of the bag is bent at an acute angle, facilitating the folding operation, and more reliable blockage of the stored item extraction path 10. Although it is preferable to provide the folding assisting part 22 on both the front sheet 2 and the back sheet 3 side, it may be provided on either one of the sheets.

  Further, the seal thin plate 13 is provided with a through-hole 23 in a vertically symmetrical position with the planned bending portion 14 therebetween. That is, the bag upper portion 5 is bent as described above so that the through holes 23 face each other, and a locking tool such as a hook can be passed with the two through holes 23 overlapped. Note that the through hole 23 for locking the latch is not limited to a circular hole.

(Locking position)
In the bending maintaining means 16, the locking portions 17, 18 are in positions symmetrical with respect to the planned bending portion 14 in the seal thin plate 13 on which the linear folding auxiliary portion 22 overlaps, and are illustrated in the figure. The locking portion 17 and the locking portion 18 are provided on the same straight line perpendicular to the planned bending portion 14, and the direction of the straight line where the locking portion 17 and the locking portion 18 are located, that is, The vertical arrangement of the locking part 17 and the locking part 18 is along the height direction of the packaging bag 1. In FIG. 1, a vertical line passing from the planned bending portion 14 to the lower locking portion 18 and an extension line of the vertical line to the upper side of the bag are represented as a straight line a. The locking portion 18 is located.

  By engaging the locking portion 17 and the locking portion 18 so that the seal thin plate 13 bends at the position of the planned folding portion 14, the position of the planned folding portion 14 as shown in FIG. Thus, the folded state of the packaging bag 1 is maintained. In particular, when the locking portion 17 and the locking portion 18 are engaged when the packaging bag 1 is bent at the planned folding portion 14, the folding of the planned folding portion 14 at the seal thin plate 13 is performed as described above. Since the auxiliary portion 22 is present, it bends in a state of being sharply cut. Further, by the function of the folding auxiliary portion 22 in the seal thin plate 13, the stored item in the planned folding portion 14 is appropriately bent so that the bent in the stored item extraction path 10 continues to the bent on the seal thin plate 13 side. It is formed in the part of the pouring path 10, and the bending of the stored article pouring path 10 is maintained by the engagement of the locking portions 17 and 18. Therefore, the stored item extraction path 10 is closed at the bent portion (position of the planned bending portion 14).

  As described above, the folding auxiliary portion 22 formed by processing a weakening line such as a discontinuous slit or a half cut is provided in the portion of the seal thin plate 13 in the planned bending portion 14, and the bending auxiliary portion 22 and the folding auxiliary portion 22 are provided. Since the bent portions 14 of the stored article extraction path 10 are bent with the locking portions 17 and 18 that are positioned on a straight line orthogonal to the auxiliary portion 22, the folding auxiliary portion 22 and the latching | locking parts 17 and 18 become the folding part formation means which bends the stored article extraction path 10 in an appropriate position. Thus, since this packaging bag 1 is provided with the fold part formation means with respect to the stored article extraction path 10, it is supposed that the stored article extraction path 10 can be easily closed as needed. .

(Sheet material)
In the above embodiment, one belt-like sheet is folded and heat-sealed at the other side portion of the bag, and the necessary cutting and cutting processes are performed. 1 is obtained by superposing and heat-sealing two sheets of a belt-like sheet as a front sheet and a belt-like sheet as a back sheet, and performing necessary cutting and cutting processes. is there.

  A sheet having a barrier property can be adopted as the front sheet and the back sheet of the packaging bag, and by doing so, the packaging bag 1 has a function to prevent deterioration of stored items. Further, the front sheet and the back sheet are formed by depositing a thin film layer of metal or inorganic oxide or a mixture thereof on at least one surface of a base layer made of synthetic resin, a water-soluble polymer and one or more alkoxides and / or It is also preferable to make a sheet using a coating layer composed of a coating agent mainly containing an aqueous solution containing at least one of the hydrolyzate or tin chloride, or a water / alcohol mixed solution. If a packaging bag is manufactured by employing such a sheet, a packaging bag having excellent gas barrier properties can be obtained.

  As an example of a specific sheet, there is a laminate of GL-AECF film 12 μm (manufactured by Toppan Printing) / LLDPE 40 μm (manufactured by Mitsui Chemicals, Inc.).

The laminate can be produced as follows. As a base material, a biaxially stretched polyethylene terephthalate (PET) film with a thickness of 12 μm is coated on one side with 2- (epoxycyclohexyl) ethyltrimethylsilane (hereinafter abbreviated as EETMS) and acrylic polyol as a primer layer in a weight ratio to EETMS. In addition, a tin chloride (SnCl ₂ ) / methanol solution (prepared to 0.003 mol / g) was added as a catalyst so that the amount was 1/135 mol with respect to EETMS and stirred. Then, a mixed solution in which triisyl isocyanate (hereinafter abbreviated as TDI) as an isocyanate compound is added so that the NCO group is equivalent to the OH group of the acrylic polyol is dried by a gravure coating method to have a thickness of 0.2 μm. To form.

  Next, the aluminum vapor was evaporated on the primer layer by an electron beam heating vacuum deposition apparatus, oxygen gas was introduced therein, and aluminum oxide having a thickness of 20 nm was deposited to form a deposited thin film layer made of an inorganic oxide. A gas barrier laminated film (GL-AECF film) is produced. A laminate can be completed by laminating a 40 μm thick sealant film made of a linear low density polyethylene (LLDPE) resin layer on the surface of the gas barrier laminate film.

  Moreover, the front sheet and the back sheet of the packaging bag can each adopt a laminated sheet having an aluminum foil layer in the layer structure, and by doing so, the packaging bag 1 becomes a packaging bag with excellent light shielding properties. As a result, it has a function of suppressing light transmission and preventing alteration of stored items.

(Packing bag hook resistance)
Next, as in the above embodiment, the upper and lower locking portions are locked on the packaging bag provided on the straight line perpendicular to the planned folding portion, and the lower locking position from the planned folding portion. In the packaging bag in which the position of the upper locking portion (corresponding to the locking portion 17) is shifted in the bag width direction with respect to the extension of the perpendicular passing through the portion (corresponding to the locking portion 18), The test shown below shows the hooking resistance (degree of engagement) between the locking parts by engaging the stop and closing the stored item extraction path by bending and applying a load to the storage part. And examined.

  The packaging bag of the example in which the present invention for carrying out comparative examination by experiment and the packaging bag of comparative examples 1 to 7 were made in the same manner as the above-described example, and a three-side-sealed packaging bag with a folded sheet was prepared. . The outer dimensions of each packaging bag were 75 mm wide × 150 mm high. In addition, the storage part, the seal part, the stored item pouring path, the spout formation scheduled part, the seal thin plate, the bending planned part, the bending auxiliary part formed by processing the weakening line on the seal thin plate, the through hole are examples, comparative examples 1-7 were the same. The bending part was set at a position of 30 mm from the upper edge of the bag toward the lower part of the bag. Thus, as a form of a packaging bag, only the position in the bag width direction in the upper locking part is different for the examples and comparative examples 1 to 7.

  As the sheets of Examples and Comparative Examples 1 to 7, the above-described laminate of GL-AECF film 12 μm (manufactured by Toppan Printing) / LLDPE 40 μm (manufactured by Mitsui Chemicals Tosero) was used.

  In the experiment method, when determining the hooking resistance between the locking portions, the packaging bag was laid flat on a flat surface so that the bag folded back when the locking portions were engaged with each other. A flat plate of 75mm x 75mm x 21mm is placed flat on the filled storage part, and the center of the flat plate is pushed in the vertical direction with a push-pull gauge. It was set as the value measured with the gauge. As the push-pull gauge, ZTA-DPU (max 5 kgf) manufactured by Imada Co., Ltd. was used. Each packaging bag was measured in an unopened state.

  In each of Examples and Comparative Examples 1 to 7, the number N of test specimens was 3, and each measurement was performed 7 times. As the intended use of this packaging bag, a bag product containing a hair conditioner was assumed, and the stored item was a hair conditioner. Assuming that the average amount of hair conditioner used per hair conditioner by a user of medium hair is 6g (equivalent to the discharge amount for two press-downs in a pump-type storage container), the storage amount of each packaging bag is about 40g. . That is, it was considered that the inner volume of the bag product was about 40 g and was used up in about seven times.

  Table 1 below shows the measured values of the average of three test specimens as the amount of displacement (X (mm) in FIG. 3) of the upper locking portion in Examples and Comparative Examples 1 to 7 and the hooking pressure resistance. . In the embodiment, as shown in FIG. 3, the upper locking portion and the lower locking portion are positioned on the straight line a, and X = 0. The shift amount of the upper locking portion in Comparative Examples 1 to 7 is the shift amount from the straight line a, and represents the difference from the case of the embodiment.

(Summary of experiment)
From the measurement results shown in Table 1, the hooking resistance is the strongest value in the packaging bag (Example) in which the upper locking portion is located on the extension of the perpendicular extending from the planned bending portion to the lower locking portion. I found out. In Comparative Example 7, the upper locking portion is shifted to the other bag side by 26 mm, but the upper locking portion is close to the vertical cut line portion, and after opening, the rigidity of the seal thin plate side is increased. In some cases, it was impossible to win and engage with the lower locking portion. In any of the packaging bags of Examples and Comparative Examples 1 to 7, even when the number of engagements and disengages of the upper and lower engaging portions is repeated, the hooking pressure resistance does not become weak.

  As described above, if the locking position of each locking portion is a packaging bag provided on a straight line orthogonal to the planned bending portion, even if some force is applied to the storage portion where the stored items are stored, It has been found that the engagement between the stop portions is not released, the bent state is reliably maintained, and the closing of the stored item pouring path is properly performed.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Front sheet 3 ... Back sheet 4 ... Storage part 5 ... Bag upper part 6 ... Bag lower part 7 ... One bag side part 8 ... The other bag side part 9 ... Seal part 10 ... Stored material extraction path 13 ... Seal thin plate 14 ... Bending portion 16 ... Bending maintenance means 17 ... Locking portion 18 ... Locking portion 22 ... Bending assisting portion

Claims (4)

It is a packaging bag in which a front sheet and a back sheet face each other and a storage part is provided between them. At least the upper part of the bag, the lower part of the bag, and one bag side part heat-seal the front sheet and the back sheet. The storage portion is continuously connected to the storage portion with a storage portion extraction path extending from the storage portion toward the upper portion of the bag, and an upper end portion of the storage portion extraction path is a spout formation portion. In the packaging bag that
The spout forming part is provided only on the bag upper corner side opposite to the one bag side part,
The stored item extraction path connected to the portion for forming the spout is formed so as to be biased toward the other bag side opposite to the one bag side, and the front sheet and the back sheet are heat sealed. A seal thin plate that is a wide-surface seal portion that reaches the seal portion between the one bag side portion and the bag upper portion is formed, and the stored item pouring path and the seal thin plate are arranged in parallel in the bag width direction. And
The stored item dispensing path is provided so as to be able to be closed by folding the bag at the planned folding portion at a position across the bag width direction across the dispensing path forming portion and the seal thin plate,
The seal thin plate is provided with a folding maintenance means for maintaining the folded state of the bag at the planned folding portion,
The folding maintenance means comprises a pair of locking portions that can be engaged with each other when the bag is folded at the planned folding portion,
The packaging bag characterized in that the positions of the locking portions are on the same straight line orthogonal to the planned bending portion.   The packaging bag according to claim 1, wherein the front sheet and the rear sheet are sheets having a barrier property and have a function of preventing deterioration of stored items.   The front sheet and the back sheet are formed by depositing a thin film layer of metal or inorganic oxide or a mixture thereof, a water-soluble polymer and one or more alkoxides and / or hydrolysis thereof on at least one surface of the base layer made of synthetic resin. The packaging bag according to claim 1 or 2, which is a sheet using a coating layer comprising a coating agent mainly comprising an aqueous solution containing at least one of a product or tin chloride, or a water / alcohol mixed solution.   The packaging bag according to any one of claims 1 to 3, wherein each of the front sheet and the back sheet is a laminated sheet having an aluminum foil layer in a layer structure.

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