JP6295735B2 - Packaging bag - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a packaging bag, and in particular, in a packaging bag formed by sealing both sides of a soft wrapping material film into a tubular shape by back-sealing in a palm shape and sealing the bottom portion and the top portion, provided on the back-sealed portion. The present invention relates to an easily openable packaging bag that can be easily opened horizontally from an opening position and a method for manufacturing the same.

  Conventionally, a packaging bag formed by sealing a soft packaging material into a bag shape has been used for various applications such as food and toiletries. There are various types of packaging bags, and the most common shape includes a pillow type. These packaging bags are formed in a cylindrical shape by forming a back-sealed seal (back seal) by stacking and sealing both ends of the slit packaging material in the shape of a palm. Seal and complete. To open these packaging bags, open the top seal part with an opening notch so as to tear the bag vertically, or provide a back notch seal part with an opening notch and tear the bag horizontally. Either opening method is generally used.

When trying to open the hat so that it opens horizontally, the right side packaging and the left side packaging are facing in opposite directions with the back sticker seal as the center, so there is a tear that started from the opening notch of the back sticker seal. There is a problem that it stops at the place where it is applied to the bag body from the back-sealed seal portion, and cannot be opened smoothly.
In order to solve this problem, a packaging bag provided with an opening guide line that induces tearing of the packaging bag in the circumferential direction is known.

Japanese Patent No. 4,357,652 Japanese Patent No. 4797217 Japanese Patent No. 3703676 Japanese Patent No. 4697910 Japanese Patent No. 4676611 Japanese Patent No. 5019032

  However, none of these packaging bags are assumed to be very heavy. In addition, the break from the opening notch may come off from the opening guide line, and in particular, a tear may develop along the back-sealed seal, but there is a requirement to open along the opening guide line. was there. In particular, in products that contain multiple contents, if the tear is removed from the opening guide line and it is opened, it is necessary to store the contents after opening. Opening along is preferred.

  In addition, when these packaging bags are opened, the packaging material is torn in a direction substantially perpendicular to the back-sealed seal portion from the opening notch and not to reach beyond the gusset portion of the packaging bag. Since it is not assumed from the beginning, it is difficult to maintain such an open state with these techniques.

The present invention has been made in view of the above circumstances, and intends to achieve the following object.
1. The tear should stop from the opening notch to both sides in the direction intersecting with the back-sealed seal part, and the tear will stop at the gusseted part formed by the folded part, and the opening that can maintain the state in which the contents are stored should be easily performed.
2. Preventing the packaging material from tearing out of the desired open state.
3. Even when the stored contents are heavy, prevent an open state that tears in the vertical direction along the back-sealed seal.
4). Improving reproducibility for the desired opened state.

The packaging bag of the present invention has at least an outermost layer and an innermost layer, and the both end portions of a packaging material made of a laminate in which the innermost layer is a heat-sealable resin layer are bonded in a palm shape and extend in the height direction. Formed back sticker seal part and sealed the bottom and top at both ends of the back sticker seal part, and gussets by inwardly folded parts were formed on both sides parallel to the back sticker seal part A packaging bag having a tubular structure,
An opening notch that is provided between the bottom part in the height direction and the top part in the back-sealed seal part and serves as an opening trigger;
An opening guide line for guiding a tear from the opening notch at the time of opening in a lateral direction intersecting the height direction in the circumferential direction of the packaging bag;
The opening guide line horizontal portion in which the unsealing guide line extends in the lateral direction, and is inclined in the height direction while approaching the back sticking seal portion continuously from the back sticking seal portion side of the unsealing guide wire horizontal portion. It consists of an opening guide line inclined part that
The opening notch is provided in the height direction range where the opening guide line is located,
The back sticking seal part side end of the opening guide line inclined part is provided at a position spaced apart from the back sticking seal part in the lateral direction,
The said subject was solved by the angle which the said unseal | opening guide line inclination part extends to 30 to 60 degree | times with respect to the said horizontal direction.
In the present invention, it is more preferable that the opening guide line horizontal part and the opening guide line inclined part are connected by a curved part.
A final bent portion that is bent in the height direction from the lateral direction may be provided at the end portion on the folding portion side in the horizontal portion of the opening guide line of the present invention.
Further, in the present invention, the opening guide wire horizontal section, Ru can also be employed a means which is provided in the height direction position spread folding unit by the contents.
In the present invention, it is desirable that a bent portion adjacent to the back sticking seal portion is further provided at the end of the opening guide line inclined portion on the back sticking seal portion side.
Furthermore, a re-bending portion that approaches the opening guide line horizontal portion in the height direction can be further provided at the end of the bent portion of the opening guide line inclined portion.
In addition, the opening guide line inclined portion is divided into a plurality of portions in the height direction to form a divided inclined portion, and the opening guide line horizontal portion side end portion in the divided inclined portion approaches the opening guide line horizontal portion. It is disposed so as to be closer to the opening guide line horizontal portion in the height direction and closer to the back sticking seal portion in the lateral direction than the end portion on the back sticking seal portion side in the next divided inclined portion, There may be a portion where the divided inclined portions overlap each other when viewed from the back-sealed seal portion side.

The packaging bag of the present invention has at least an outermost layer and an innermost layer, and the both end portions of a packaging material made of a laminate in which the innermost layer is a heat-sealable resin layer are bonded in a palm shape and extend in the height direction. Formed back sticker seal part and sealed the bottom and top at both ends of the back sticker seal part, and gussets by inwardly folded parts were formed on both sides parallel to the back sticker seal part A packaging bag having a tubular structure,
An opening notch that is provided between the bottom part in the height direction and the top part in the back-sealed seal part and serves as an opening trigger;
An opening guide line for guiding a tear from the opening notch at the time of opening in a lateral direction intersecting the height direction in the circumferential direction of the packaging bag;
The opening guide line horizontal portion in which the unsealing guide line extends in the lateral direction, and is inclined in the height direction while approaching the back sticking seal portion continuously from the back sticking seal portion side of the unsealing guide wire horizontal portion. It consists of an opening guide line inclined part that
The opening notch is provided in the height direction range where the opening guide line is located,
In the opening guide line having the opening guide line inclined portion that is not in this angle range, the extending angle of the opening guide line inclined portion is set to 30 degrees or more and 60 degrees or less with respect to the lateral direction. When the force is applied in the height direction, the opening guide line slope is too large and the opening guide line slope is in the height direction. It extends from the end of the back-sealed seal part side in the height direction and faces downward, or the inclination angle of the opening guide line inclined part is too small, from the opening guide line inclined part to the opening guide line horizontal part It is possible to prevent the tear from progressing in an unexpected direction without the tear from the opening notch reaching the opening guide line inclined portion during the movement. As a result, when the force in the height direction, especially when the contents are heavy, such as miso, only the lower side of the opening notch is moved using the upper side of the opening notch as a fulcrum when opening, and downward when opening Even when an excessive force is applied, the tear from the opening notch is directed downward, and the tear can be prevented from extending along the back-sealed seal.

In the present invention, when the opening guide line horizontal part and the opening guide line inclined part are connected by a curved part, the opening guide line is inclined when the tear is guided and opened along the opening guide line at the time of opening. It is possible to smooth the transmission from the part to the unsealing guide line horizontal part and prevent the tear from progressing in the height direction.
According to the present invention, by dividing the opening guide line inclined portion so as to gently reach the connecting portion with the opening guide line horizontal portion, it is possible to reduce the tearing at the time of opening from deviating from the opening guide line. can do.

  In the horizontal part of the opening guide line of the present invention, the end part on the side of the folded part is provided with a final bent part that is bent from the lateral direction to the height direction, and thus has progressed along the opening guide line. The unsealed state can be controlled so that the tear does not progress in the direction beyond the folding portion. Here, the final bent portion provided at the folding portion side end portion in the opening guide line horizontal portion may be bent toward the opening guide line inclined portion side with respect to the opening guide line horizontal portion, or the opening guide wire It can also be bent toward the opposite side of the inclined portion. Further, the end of the final bent portion can be set in a direction perpendicular to the horizontal portion of the opening guide line, and further formed so as to approach the horizontal portion of the opening guide line while being away from the center folding line of the folding portion. You can also. Further, the end portion on the folding portion side in the horizontal portion of the opening guide line can be set to a position corresponding to the center folding line of the folding portion, so that the opening by the opening guide line is center folded of the folding portion. It is possible to easily control the line up to the line.

  In the present invention, the horizontal portion of the unsealing guide line is provided at the position in the height direction where the folded portion is widened by the contents, so that the width in the front-rear direction of the folded portion is not widened. Sometimes, the back-sealed seal part is difficult to deform because the packaging material is stuck together, and it is difficult to open, so extra force is applied, so the tear is easily separated from the opening guide line, especially in the height direction It is easy to avoid such a problem that the rift progresses. At the same time, since it can be opened in the lateral direction at a position close to the upper end of the contents, the convenience in storing and taking out the contents is not impaired.

  Further, the end portion of the opening guide line inclined portion on the back sticking seal portion side is provided at a position spaced apart from the back sticking seal portion in the lateral direction, thereby affecting the sealing state in the back sticking seal portion. In addition, since the opening guide line due to sealing does not reduce the ability to guide the tear, it prevents tearing in the height direction (longitudinal direction) along the back-sealed seal portion, and the desired opening state is achieved. It can be easily realized.

  In the present invention, a bent portion adjacent to the back-sealed seal portion is further provided at the end portion of the opening guide line inclined portion on the back-sealed seal portion side, so that a tear that has extended from the unsealed notch is opened. Even when the guide line sloped part has reached the side opposite the opening guide line horizontal part after reaching the guide line slope part, it prevents the tear from extending in the height direction as it is from the end of the opening guide line slope part on the back-sealed seal part side. Change the direction to advance toward the back-sealed seal part at the bent part, and prevent the packaging bag from being opened to a state where it can no longer contain the contents because the tear in the height direction extends indefinitely Thus, a desired opened state can be easily realized.

  Furthermore, the end of the bent part of the opening guide line inclined part is further provided with a rebend part that approaches the horizontal part of the opening guide line in the height direction, so that a tear that has extended from the opening notch, Even if it reaches the opening guide line inclined part and extends to the opposite side of the opening guide line horizontal part, it prevents the tear from extending in the height direction as it is from the end of the opening guide line inclined part on the back-sealed seal part side In the bent part and the re-bent part, the direction is changed so as to advance to the back-sealed seal part side and the unsealing guide line horizontal part side, and the tear in the height direction extends indefinitely, and the packaging bag stores the contents. It is possible to easily realize a desired opened state by preventing the opened state from being unaccommodable.

  The opening guide line inclined portion is divided into a plurality of portions in the height direction to form a divided inclined portion, and the opening guide line horizontal portion side end portion of the divided inclined portion approaches the opening guide line horizontal portion. It is disposed so as to be closer to the opening guide line horizontal portion in the height direction and closer to the back sticking seal portion in the lateral direction than the end portion on the back sticking seal portion side in the next divided inclined portion, By having a portion where the divided inclined portions overlap each other when viewed from the back sticking seal portion side, a tear generated from the opening notch at the time of opening is separated from the back sticking seal portion, and the opening guide wire horizontal portion is reached from the opening guide wire inclined portion. In the opening guide line inclined part separated as the divided inclined part when guiding the tear along the opening along the opening, the back sticking seal part extends, so that the force required for opening is large (height direction) Rift to In the extension, the extension of the tear is intermittently progressed in the part separated as the divided inclined part, so that the extension direction of the tear is redirected in the lateral direction, and momentum is applied in the part where the divided inclined part extends. By attaching and extending the tear, the momentum of the force applied to the packaging material at the time of opening is accumulated and released, which is more necessary than simply extending the tear in the height direction (longitudinal direction). Can be reduced, so that it is not necessary to apply excessive force when opening. As a result, in the opening guide line having the opening guide line inclined portion which is not separated, the opening guide line inclined portion requires a larger force for opening compared to the opening guide line horizontal portion, and in some cases an excessive force is applied. In the vicinity of the connecting part with the horizontal part, it is possible to solve the problem of opening and deviating from the opening guide line. By dividing the part into multiple parts, the force required to open each part can be reduced, so that excessive force can be prevented from being applied, and it is possible to prevent deviation from the migration guide line. Thus, opening along the opening guide line can be easily performed.

  According to the present invention, it is possible to smoothly guide the tear from the opening line inclined part that requires the opening force to pick up the tear from the opening notch and to the opening guide line horizontal part, so that excessive force is applied. It can be prevented, and it can be prevented from deviating from the opening guide line, and can be easily opened along the opening guide line, and the force in the height direction, especially the contents are heavy, such as miso In the case of a thing, the upper side of the opening notch is moved as a fulcrum at the time of opening, and only the lower side of the opening notch is moved. Is directed downward, and it is possible to prevent the tear from extending along the back-sticking seal.

It is a perspective view which shows 1st Embodiment of the packaging bag which concerns on this invention. It is a perspective view which shows the contents in 1st Embodiment of the packaging bag which concerns on this invention, and the tear at the time of opening. It is a schematic diagram which shows the opening guide line in 1st Embodiment of the packaging bag which concerns on this invention. It is a schematic diagram which shows the opening guide line in 1st Embodiment of the packaging bag which concerns on this invention. It is a schematic diagram which shows the opening guide line in 2nd Embodiment of the packaging bag which concerns on this invention. It is a schematic diagram which shows the opening guide line in 3rd Embodiment of the packaging bag which concerns on this invention. It is a schematic diagram which shows the opening guide line in 4th Embodiment of the packaging bag which concerns on this invention. It is a schematic diagram which shows the other example of the opening guide line in embodiment of the packaging bag which concerns on this invention. It is a schematic diagram which shows the other example of the opening guide line in embodiment of the packaging bag which concerns on this invention.

Hereinafter, 1st Embodiment of the packaging bag which concerns on this invention is described based on drawing.
1 and 2 are perspective views showing a packaging bag according to this embodiment. In the figure, reference numeral 1 denotes a packaging bag.

  As shown in FIGS. 1 and 2, the packaging bag 1 according to the present embodiment has a height obtained by laminating both side ends of a packaging material 2 made of a laminate having a heat-sealable resin layer as the innermost layer in a palm shape. The back-sealed seal portion 3 extending in the direction Z is formed, the bottom portion and the top portion are sealed to form the bottom seal portion 4 and the top seal portion 5, respectively. This is a packaging bag having a gusset-type tubular structure in which a gusset that extends in the front-rear direction Y by the inwardly folded portion 8 is formed.

The packaging bag 1 has an opening notch 7 that triggers opening at a predetermined portion of the back-sealed seal portion 3, and the packaging bag 2 has a tear α from the opening notch 7 when opened at the center in the width direction of the packaging material 2. The opening guide line 6 guides in the lateral direction X intersecting the height direction Z in the circumferential direction.
The unsealing guide line 6 is continuously high from the unsealing guide line horizontal portion 61 extending in the lateral direction X and the back pasting seal portion 3 side end portion 61a of the unsealing guide wire horizontal portion 61 while approaching the back pasting seal portion 3. The opening guide line inclined portion 62 is inclined in the vertical direction Z. In other words, the unsealing guide line 6 includes an unsealing guide line horizontal portion 61 and an unsealing guide line end inclined portion 62 from the end portion 61a of the unsealing guide line horizontal portion 61 toward the back-sealed seal portion 3 at a predetermined angle θ. .

  As shown in FIG. 1 and FIG. 2, the unsealing guide wire 6 according to the present embodiment is provided on both sides of the back sticking seal portion 3 so as to be substantially line symmetrical with respect to the back sticking seal portion 3. It extends from the seal portion 3 to the center fold line 8 h of the fold portion 8, and the back sticking seal portion 3 side end portion is formed away from the back sticking seal portion 3. In FIG. 3, only the opening guide line 6 on the right side of the back-sealed seal portion 3 is shown.

3A to 3C are schematic diagrams showing the unsealing guide line 6 in the present embodiment, and FIG. 4 is an enlarged schematic diagram showing the vicinity of the unsealing guide line inclined portion 62 in the present embodiment.
As shown in FIG. 3, the opening guide line 6 according to the present embodiment has an angle θ that the direction in which the opening guide line inclined portion 62 extends and the lateral direction X in which the opening guide line horizontal portion 61 extends has an angle θ of 30. More than 60 degrees and less than 60 degrees. A more preferable value of the angle θ can be 40 degrees or more and 50 degrees or less.
As shown in FIG. 2, when the contents M are stored, the unsealing guide line horizontal portion 61 is set to a height direction Z position equal to the upper end position thereof, and is directed downward from the top seal portion 5 to the height direction Z. It is provided at the highest position where the gusset spreads and the folding part 8 is almost open.

  In the opening guide line 6 having the opening guide line inclined portion 62 that is not in the above angle range, when the opening force is applied in the height direction Z, the inclination angle of the opening guide line inclined portion 62 is too large, and the opening guide line 6 When the inclined portion 62 faces the direction close to the height direction Z, the tear α from the unsealing notch 7 is directly below the end portion 62d of the unsealing guide line inclined portion 62 in the height direction Z. It is not preferable because it extends into In addition, since the inclination angle θ of the opening guide line inclined portion 62 is too small, the tears α from the opening notch 7 cannot be picked up by the opening guide line 6, and the tear may progress in an unexpected direction. At the time of movement of the tear α from the inclined portion 62 to the unsealing guide line horizontal portion 61, the tear α is detached from the unsealing guide line 6 and the tear progresses in an unexpected direction.

  In this embodiment, when the inclination angle of the opening guide line inclined portion 62 is reduced and the angle θ formed with the lateral direction X is 30 degrees to 45 degrees, the opening guide line for the tear α from the opening notch 7 In the guidance from the inclined portion 62 to the unsealing guide line horizontal portion 61, the tear is removed from the unsealing guide wire 6, and the tear α is in the height direction Z near the boundary between the unsealing guide wire inclined portion 62 and the unsealing guide line horizontal portion 61. It can prevent progress. Further, when the inclination angle of the opening guide line inclined portion 62 is increased so that the angle θ formed with the lateral direction X is 45 degrees to 60 degrees, the opening guide line inclined section 62 with respect to the tear α from the opening notch 7 is reached. , It is possible to prevent the tear α from moving in the height direction Z before reaching the opening guide line inclined portion 62.

As shown in FIG. 8B, the end 61a of the unsealing guide line horizontal portion 61 on the back sticker 3 side is connected to the unsealing guide line inclined portion 62 via a curved portion 61A. The curved portion 61A is set to bend at a radius of curvature R61a from the lateral direction X in which the unsealing guide line horizontal portion 61 extends to the direction that forms an angle θ with the height direction Z in which the unsealing guide line inclined portion 62 extends. Yes.
The radius of curvature R61a can be set to 3 to 10 mm, preferably about 5 mm. As shown in FIG. 8A, an end 61b of the unsealing guide line horizontal portion 61 on the folding portion 8 side is located at a position corresponding to the center folding line 8h located at the center of the folding portion 8 in the lateral direction X. Accordingly, the unsealed state can be set so that the tear α guided by the unsealing guide line 6 reaches the center fold line 8.

  The leading end 62d of the unsealing guide line inclined portion 62 is 1 mm or more outside from the back-sealed seal portion 3, and the unsealing notch 7 exists in the position range Z6 in the height direction Z of the unsealing guide line 6. The opening notch 7 may be any of I notch, U notch, V notch and the like.

  Since the opening notch 7 exists in the range of the opening guide line height Z6 shown in FIG. 4, the tear α of the packaging material starting from the opening notch 7 at the stage of opening the packaging bag 1 is as shown in FIG. To the end 61a along the opening guide line inclined portion 62, and thereafter, from the curved portion 61A to the end 61b along the opening guide line horizontal portion 61. To open. As a result, the opening operation is smoothly performed, and the cut end of the packaging bag after opening is also clean.

  When the respective positions in the height direction Z of the opening guide line 6 and the like are arranged in order, as shown in FIG. 4, the Z position Z61 of the opening guide line horizontal part 61, the Z position Z7 of the opening notch 7 and the opening guide line inclined part They are arranged in the order of the Z position Z62d of the terminal end 62d of 62.

  When the respective positions in the lateral direction X of the opening guide line 6 and the like are arranged in order, as shown in FIG. 4, the X position X 61 a of the end portion 61 a of the back-sealed seal part 3 side of the opening guide line horizontal part 61, the opening guide line inclination The X position X62d of the end portion 62d of the section 62, the X position X3 of the boundary of the back-sticking seal 3, and the X position X7 of the opening notch 7 are arranged in this order.

According to the present embodiment, the angle θ between the horizontal direction X in which the unsealing guide line horizontal portion 61 extends is 30 degrees or more and 60 degrees or less, so that the force in the height direction Z, in particular, the content M is miso. When it is heavy, such as when the upper notch 7 is moved as a fulcrum at the time of opening, only the lower side of the opening notch 7 is moved, and an excessive force downward is applied at the time of opening. 7 can be prevented from extending along the back-sticking seal 3.
According to the present embodiment, the angle of the opening guide line inclined portion 62 is set so that the tear α from the opening notch 7 gently reaches the opening guide line horizontal portion 61, so that the tear α when opening is opened. Can deviate from the opening guide line 6.

  Furthermore, since the unsealing guide wire horizontal portion 61 and the unsealing guide wire inclined portion 62 are connected by the curved portion 61A, the extension direction of the tear α can be redirected along the unsealing guide line 6 in the lateral direction X. Further, it is possible to prevent the split α from progressing in the longitudinal direction Z and deviating from the opening guide line 6.

  When the unsealing guide line horizontal portion 61 is provided at the upper height direction position Z61w where the width dimension in the front-rear direction Y of the folding portion 8 shown in FIG. 2 is stuck together and it is difficult to deform and it is difficult to open, so there is a possibility that an extra force is applied, and the tear α is easily separated from the opening guide line 6, and in particular, the tear α progresses in the height direction Z It is easy for problems to occur. At the same time, there is a tendency that the tear α that is guided by the opening guide line 6 does not enter the open state where it extends beyond the end portion 61 b and reaches the position of the center folding line 8. On the other hand, in the present embodiment, the unsealing guide line horizontal portion 61 is provided at the position Z61 in the height direction Z where the folding portion 8 is expanded by the contents M. It is easier to avoid unnecessary extension of the rip. At the same time, since it can be opened in the lateral direction at a position close to the upper end of the content M, the convenience in storing and taking out the content is not impaired.

  In the present invention, the film used as the outer layer of the packaging material 2 made of a laminate is a basic material constituting the packaging bag 1, and therefore, for example, a polyester, polyamide, polycarbonate, polyacetal, or other synthetic resin A film can be used. Since the synthetic resin film used as the outer layer is generally often printed on the surface on the inner layer side, printability is required. For this reason, as a synthetic resin film used as an outer layer, the stretched film extended | stretched to the biaxial direction is preferable.

  The thickness of the outer layer film may be a thickness that can be kept to the minimum necessary with respect to strength, rigidity, etc. as a basic material, and about 12 to 25 μm is appropriate. Further, when a film on which an inorganic vapor deposition layer such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide or the like is used is used as the film, it is possible to impart barrier properties to the packaging material. . Furthermore, in order to improve easy cutting property, a cellophane, a polyester film with good hand cutting properties, or the like may be used.

  Next, examples of the resin having heat sealability used as the innermost layer include low density polyethylene resin, medium density polyethylene resin, high density polyethylene resin, linear (linear) low density polyethylene resin, polypropylene resin, and ethylene. -Vinyl acetate copolymer resin, ionomer resin, ethylene-acrylic acid copolymer resin, ethylene-methyl acrylate copolymer resin, ethylene-methacrylic acid copolymer resin, ethylene-propylene copolymer resin, etc. Can be melted and fused to each other. These may be used alone or in combination of two or more, and a resin and a sheet obtained by forming them into a film may be used. As thickness, 15-100 micrometers is desirable and 30-50 micrometers is more preferable.

In the present invention, an intermediate layer may be provided between the outer layer and the inner layer. For example, metal foil such as aluminum, iron, copper, tin, or polyethylene terephthalate resin, polyamide resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-propylene copolymer resin, ethylene -It is possible to use a film such as a saponified vinyl acetate copolymer or a polyvinylidene chloride resin, or a film obtained by depositing an inorganic substance such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide or zirconium oxide. These may be used alone or in combination of two or more.
By providing these films in the intermediate layer, gas barrier properties, water vapor barrier properties, mechanical strength, bending resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, etc. It becomes possible to improve.

Next, a method for forming the opening guide wire 6 will be described.
The opening guide wire 6 is preferably a half-cut wire that cuts at least the outer layer of the laminate constituting the packaging material 2 and leaves the innermost layer. As a method of forming a half cut line, there are a method using a blade and a method using a laser processing machine.
Examples of the laser processing machine include a laser processing machine using a carbon dioxide gas laser having a continuous or pulse oscillation format, a YAG laser, an excimer laser, etc., but when a gas barrier property of contents such as food is required, For example, it is more preferable to use a carbon dioxide laser capable of selective cutting so as to leave only the innermost sealant layer.

  The step of forming the unsealing guide line 6 using a laser processing machine can be performed at the time of slitting the printed wide original fabric into a predetermined packaging material width, or can be performed after the slit processing. Since the packaging material 2 used for the packaging bag according to the present invention has the opening guide line margin described above, the opening guide lines 6 adjacent to each other are separated from each other. The position of the scheduled slit position can be slit in between. Thus, since the opening guide line 6 can be formed before slitting the printed wide original fabric, the opening guide line 6 can be formed efficiently. In forming the opening guide line 6, the register mark formed at the time of printing is read and formed at a predetermined position in accordance with the pattern.

  As a manufacturing process of the packaging bag according to the present invention, a printing process for printing a predetermined pattern on the outer layer film, a process for creating an original packaging material by bonding the intermediate layer and the innermost layer to the outer layer film, and a printed packaging It includes at least a step of forming an opening guide line on the raw material by a laser processing method, a step of slitting a printed raw material of the packaging material to a predetermined width, and a step of forming a back-sealed seal portion and providing an opening notch. As the process for forming the opening guide line, it can be provided immediately before or immediately after the slitting process, immediately before forming the back-sealed seal part in the bag making machine or the filling and packaging machine, etc., but the feature of the present invention is most effective. It is immediately before the slitting process that is exhibited.

  On the other hand, when providing an opening guide line after the slitting process, an opening guide line processing step by a laser processing machine may be provided independently, or a laser processing machine is installed on a bag making machine or a filling and packaging machine, An opening guide line may be formed immediately before the bag making process. In either case, the laser processing machine may be one that can handle the narrow width after the slit, and thus the cost of the laser processing machine is greatly reduced. In recent years, filling and packaging machines that perform filling at the same time as bag making have become commonplace. If a laser processing machine is installed in such a filling and packaging machine, in addition to the formation of opening guide lines and bag making, the filling of contents can also be carried out. Can be carried out consistently in one step. Examples of such a filling and packaging machine include a general horizontal pillow packaging machine, a vertical pillow packaging machine, a bag feeding packaging machine, and the like.

  In any case, positioning of laser processing is performed by reading a register mark provided in the printing process. However, by controlling the laser processing machine in software, the original material of the packaging material is not necessarily at a constant speed. This is not limited to when the air is flowing at the time, and is also possible when accelerating / decelerating or stopping.

In addition, the breaking strength in the vertical direction including the opening guide line of the packaging material can be 5 N / 15 mm or more, so that the strength in the flow direction of the packaging material is maintained, and the packaging material is in the manufacturing process and in use. It can be manufactured and used while maintaining stable physical properties without causing breakage, pinholes, reduced barrier properties, and local elongation starting from the opening line. When the breaking strength is less than 5 N / 15 mm, there arises a problem that suitability for post-processing cannot be obtained, for example, a breakage occurs due to a tension during bag making.
Furthermore, the tear strength along the opening guide line of the packaging material can be set to 0.01 N to 2 N as measured by JIS K-7125 C method. It is possible to perform a beautiful opening along the guide line with an appropriate strength without excessive tearing strength due to the elongation of the layer. When the tear strength exceeds 2N, there arises a problem that the actual opening line cannot be guided to the opening guide line. If it is less than 0.01 N, problems such as post-processing suitability and distribution suitability arise.

Hereinafter, 2nd Embodiment of the packaging bag which concerns on this invention is described based on drawing.
FIG. 5 is a schematic diagram showing an opening guide line of the packaging bag in the present embodiment.
This embodiment is different from the first embodiment described above with respect to the final bent portion 63, and other corresponding components are denoted by the same reference numerals and description thereof is omitted.

In the packaging bag 1 of the present embodiment, as shown in FIG. 5, a final bent portion 63 that is bent from the lateral direction X to the height direction Z at the folding portion 8 side end portion 61 b in the unsealing guide wire horizontal portion 61. Is provided.
The final bent portion 63 of the present embodiment has a type in which the direction toward the end side is on the upper side as shown in FIG. 5A with respect to the lateral direction X in which the unsealing guide wire horizontal portion 61 extends. As shown in FIG. 5B, the lower type can be exemplified. The end portion side of the final bent portion 63 is set to have an orientation having an angle of about 45 to 90 degrees with respect to the lateral direction X.
In FIG. 5, in order to mainly explain the opening guide line horizontal portion 61, the opening guide line inclined portion 62 is not divided.

  In the packaging bag 1 of the present embodiment, by providing the final bent portion 63, the tear α that has progressed along the opening guide line 6 stops at a position corresponding to the center folding line 8h and is folded in the lateral direction X. It is possible to control the unsealed state so that the portion 8 does not progress beyond the center folding line 8h. Here, the final bent portion 63 provided at the folding portion side end portion 61b in the unsealing guide line horizontal portion 61 is bent to the same lower side as the unsealing guide line inclined portion 62 with respect to the unsealing guide line horizontal portion 61. Alternatively, it may be bent toward the upper side opposite to the opening guide line inclined portion 62. Further, the tip (end) of the final bent portion 63 can be in a direction perpendicular to the unsealing guide line horizontal portion 61, and further, approaching the unsealing guide line horizontal portion 61 while moving away from the folding portion 8. It can also be formed. By this final bent portion 63, it is easy to stop the tear [alpha] that has progressed along the opening guide line 6 at a position corresponding to the center fold line 8h and to open from the back-sealed seal portion 3 to the center fold line 8h. Become.

Hereinafter, 3rd Embodiment of the packaging bag based on this invention is described based on drawing.
FIG. 6 is a schematic diagram showing an opening guide line of the packaging bag in the present embodiment.
This embodiment is different from the first and second embodiments described above with respect to the bent portion 64, and other corresponding components are denoted by the same reference numerals and description thereof is omitted.

In the present embodiment, the end portion 62d on the back sticking seal portion 3 side of the opening guide line inclined portion 62 is provided with a bent portion 64 that is further closer to the back sticking seal portion 3 side from the end portion 62d.
As shown in FIG. 6, the distal end 64d of the bent portion 64 is bent so as to be close to the back-sealed seal portion 3 side with respect to the extending direction of the opening guide line inclined portion 62. The direction X is set to be the direction toward the back-sticking seal portion 3.

  As a result, even when the tear α extending from the opening notch 7 reaches the opening guide line inclined portion 62 and then advances to the side opposite to the opening guide line horizontal portion 61, the tear α is formed on the opening guide line inclined portion 62. It is prevented from extending in the longitudinal direction (height direction) Z as it is from the end portion 62d on the back sticking seal portion 3 side, and proceeds to the back sticking seal portion 3 side at the bent portion 64 as shown as a tear α1 in the drawing. By changing the direction as described above, it is possible to prevent the tear in the longitudinal direction (height direction) Z from extending indefinitely and the packaging bag 1 from being opened to a state where it cannot accommodate the contents. In this case, the extension of the slit α1 stops at the boundary of the back-sealed seal portion 3. Thereby, it becomes possible to easily realize a desired opening state.

Hereinafter, 4th Embodiment of the packaging bag which concerns on this invention is described based on drawing.
FIG. 7 is a schematic diagram showing an opening guide line of the packaging bag in the present embodiment.
This embodiment is different from the first and second embodiments described above with respect to the bent portion 64, and other corresponding components are denoted by the same reference numerals and description thereof is omitted.

In the present embodiment, the end portion 64d of the bending portion 64 is provided with a re-bending portion 65 that approaches the unsealing guide line horizontal portion 61 in the height direction Z from the bending portion 64.
As shown in FIG. 7, the tip 65 d of the re-bending portion 65 is bent so as to be closer to the unsealing guide line horizontal portion 61 side in the height direction Z with respect to the extending direction of the bending portion 64. Preferably, it is set to be a direction toward the top top seal 5 which is the upper side in the vertical direction Z.

  As a result, even when the tear α extending from the opening notch 7 reaches the opening guide line inclined portion 62 and then advances to the side opposite to the opening guide line horizontal portion 61, the tear α is formed on the opening guide line inclined portion 62. In the bent portion 64 and the re-bent portion 65, it is prevented from extending in the longitudinal direction (height direction) Z as it is from the end portion 62d on the side of the back-sealed seal portion 3 and further toward the back-sealed seal portion 3. The direction is changed so as to proceed toward the previously formed tear α, and the tear in the longitudinal direction (height direction) Z extends indefinitely, and the tear extends along the back-sealed seal portion 3 indefinitely. Thus, the packaging bag 1 can be prevented from being unsealed to a state where it cannot contain the contents. In this case, the tear α does not reach the back-sealed seal portion 3. Thereby, it becomes possible to easily realize a desired opening state.

Moreover, in each said embodiment, as shown in FIG. 8, the opening guide wire inclination part 62 can be divided | segmented into plurality.
FIG. 8A is a schematic diagram showing the unsealing guide wire 6 in this embodiment, and FIG. 8B is an enlarged schematic diagram showing the vicinity of the unsealing guide wire inclined portion 62 in this embodiment.
As shown in FIG. 8, the opening guide line inclined portion 62 is divided into a plurality of portions in the height direction Z to form divided inclined portions 62A, and the opening guide line horizontal portion 61 side end portion 62a of the divided inclined portion 62A is In the height direction Z, it is closer to the unsealing guide line horizontal portion 61 side than the end portion 62b on the back sticking seal portion 3 side in the next divided inclined portion 62B that is close to the unsealing guide line horizontal portion 61, and is back pasted in the lateral direction X. It is arranged so as to be close to the seal portion 3 side, and has a portion where the divided inclined portion and the divided inclined portion overlap when viewed from the back-attached seal portion 3 side.

That is, as shown in FIG. 8A, the opening guide line inclined portion 62 is divided into a divided inclined portion 62A and a divided inclination from the end portion 61a of the opening guide line horizontal portion 61 toward the back-sealed seal portion 3 at a predetermined angle θ. 62A, and the division | segmentation inclination part 62A has the curved part 62C bent toward the back sticking seal | sticker 3 side rather than the extending direction. An end 62a on the upper side in the height direction Z of the curved portion 62C is located on the upper side in the height direction Z with respect to the end 62b in the divided inclined portion 62B, and on the right side (outer side) near the folding portion 8 in the lateral direction X. positioned. The divided inclined portion 62A is bent from the extending direction at the end 62c and connected to the bent portion 62C.
The curved portion 62C can be set to make an angle of 30 to 60 degrees, preferably 45 degrees with respect to the lateral direction X in which the unsealing guide line horizontal portion 61 extends.

  When the respective positions in the height direction Z of the opening guide line 6 and the like are arranged in order, as shown in FIG. 8B, the Z position Z61 of the opening guide line horizontal part 61 and the Z position of the end part 62a of the curved part 62C Z62a, Z position Z62b of end 62b of divided inclined portion 62B, Z position Z62c of end 62c of divided inclined portion 62A, and Z position Z62d of end portion 62d of divided inclined portion 62A are arranged in this order.

  When the respective positions in the lateral direction X of the unsealing guide line 6 and the like are arranged in order, as shown in FIG. 8B, the X position X61a of the end portion 61a on the back-sealed seal part 3 side of the unsealing guide line horizontal part 61 is divided. X position X62b of end 62b of inclined portion 62B, X position X62c of end 62c of divided inclined portion 62A, X position X62a of end 62a of curved portion 62C, X position X62d of end portion 62d of divided inclined portion 62A, They are arranged in the order of the X position X3 of the back sticker 3 boundary.

As described above, the divided inclined portion 62A (curved portion 62C) and the divided inclined portion 62B have the Z position Z62a to the Z position Z62b, which are overlapping portions when viewed from the back-attached seal portion 3 side.
In the divided inclined portion 62A (curved portion 62C) and the divided inclined portion 62B, it is preferable that both the end portion 62a and the end portion 62b are separated by about 0.5 mm in the X direction and the Z direction.

According to this configuration, the tear α generated from the opening notch 7 at the time of opening reaches the divided inclined portion 62A at a position spaced apart from the back-sealed seal portion 3 in the lateral direction X, and reaches the end portion 62c along the divided inclined portion 62A. And it runs to the edge part 62a along the curved part 62C.
As shown in FIG. 8 (a), the tear α that has reached the end 62a reaches the split inclined portion 62B, reaches the end 61a along the split inclined portion 62B, and thereafter, the unsealing guide line horizontal portion 61. And run to the end 61b. As a result, the opening operation is smoothly performed, and the cut end of the packaging bag after opening is also clean.
At this time, the separated opening guide line inclined portion 62 assists the extension of the tear α in the longitudinal direction (height direction) Z in which the force required for opening is large because the back-sealed seal portion 3 extends. However, at this time, in the portion where the opening guide line 6 from the end portion 62a of the divided inclined portion 62A to the end portion 62b of the divided inclined portion 62B is separated, the degree of extension of the tear progresses intermittently. It will be.

As a result, the split α is guided by the opening guide line 6 in the portion along the divided inclined portion 62A, but the split α 62A and 62B is extended, and momentum is applied to the intermittent portion while the divided inclined portions 62A and 62B extend. As a result, the momentum of the force applied to the packaging material 2 at the time of opening is slightly accumulated and released. This makes it possible to reduce the necessary force as compared to simply extending the tear in the height direction (longitudinal direction), so that it is not necessary to apply an excessive force when opening.
Therefore, it does not require a large force for opening as compared with the case where the opening guide line inclined portion is not separated, and the opening is deviated from the opening guide wire in the vicinity of the connecting portion with the horizontal portion by applying excessive force. It is possible to prevent the occurrence of problems such as

  Here, although the opening guide line inclined portion 62 is divided into two, it can be further divided into a large number. For example, as shown in FIG. 9, a four-part division can be illustrated. In this example, from the unsealing guide line horizontal part 61 side, a divided inclined part 62B, a divided inclined part 62A, a divided inclined part 62D, and a divided inclined part 62F are provided. A curved portion 62E that is provided and corresponds to the relationship of the curved portion 62C between the divided inclined portion 62B and the divided inclined portion 62A so as to have an overlapping portion when viewed from the back sticker 3 side. It is possible to have a curved portion 62G.

  Examples according to the present invention will be described below.

A biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm and a width of 720 mm and a low density polyethylene (LDPE) resin film having a thickness of 30 μm and a width of 720 mm were bonded together by a dry lamination method to obtain a packaging material.
Subsequently, an opening guide wire was formed using a carbon dioxide laser processing machine, and then slit processing was performed so as to have a width of 140 mm. The details of the opening guide line are as shown in FIGS. Next, a gusset pillow packaging bag as shown in FIG. 1 in which the width of the back-sealed seal portion was 20 mm was produced, and an opening notch was provided. Thereby, opening was able to be performed suitably.

1 ... Packaging bag,
2 ... wrapping materials,
3 ... Back-sealed seal part,
6 ... Opening guide wire,
7 ... Opening notch,
8 ... folded part,
61 ... opening guide line horizontal part,
62 ... Opening guide wire inclined part,
θ ... Angle

Claims (7)

A back-sealed seal portion that has at least an outermost layer and an innermost layer, and the both end portions of the packaging material made of a laminate in which the innermost layer is a heat-sealable resin layer are bonded in a palm shape and extend in the height direction. A packaging bag having a cylindrical structure that is formed and seals the bottom and the top at both end positions of the back-sealed seal portion, and has gussets formed by inwardly folded portions on both side portions parallel to the back-sealed seal portion Because
An opening notch that is provided between the bottom part in the height direction and the top part in the back-sealed seal part and serves as an opening trigger;
An opening guide line for guiding a tear from the opening notch at the time of opening in a lateral direction intersecting the height direction in the circumferential direction of the packaging bag;
The opening guide line horizontal portion in which the unsealing guide line extends in the lateral direction, and is inclined in the height direction while approaching the back sticking seal portion continuously from the back sticking seal portion side of the unsealing guide wire horizontal portion. It consists of an opening guide line inclined part that
The opening notch is provided in the height direction range where the opening guide line is located,
The back sticking seal part side end of the opening guide line inclined part is provided at a position spaced apart from the back sticking seal part in the lateral direction,
The packaging bag, wherein an angle at which the opening guide line inclined portion extends is 30 degrees or more and 60 degrees or less with respect to the lateral direction.   The packaging bag according to claim 1, wherein the opening guide line horizontal portion and the opening guide line inclined portion are connected by a curved portion.   The packaging bag according to claim 1, wherein a final bent portion that is bent in the height direction from the lateral direction is provided at an end portion of the folding guide line in the horizontal portion of the opening guide line.   The packaging bag according to any one of claims 1 to 3, wherein the opening guide line horizontal portion is provided at the height direction position where the folded portion is expanded by contents. The packaging bag according to any one of claims 1 to 4, wherein a bent portion adjacent to the back sticking seal portion is further provided at an end of the opening guide line inclined portion on the back sticking seal portion side. The opening in the end portion of the bent portion of the guiding line inclined portion, further claim 5 Symbol mounting packaging bag of the re-bend in the height direction approaching the opening guide line horizontal section and which are located. The opening guide line inclined portion is divided into a plurality of portions in the height direction to form a divided inclined portion, and the opening guide line horizontal portion side end portion in the divided inclined portion is next to the opening guide line horizontal portion. It is arranged so as to be closer to the opening guide line horizontal part in the height direction and closer to the back sticking seal part in the lateral direction than the end part on the back sticking seal part side in the divided inclined part. The packaging bag according to any one of claims 1 to 6, further comprising a portion where the divided inclined portions overlap each other when viewed from the seal portion side.

Images