JP6496114B2 - Bag with bottom - Google Patents

Description

The present invention relates to a bag body with a bottom surface, particularly a bag body made of synthetic resin, which is improved to improve the sealing strength of the bottom surface portion.

Today, a bag body having a bottom sheet such as a standing pouch, more specifically, a front sheet, a back sheet, and a bottom sheet disposed between both the front and back sheets, the bottom sheet Is divided into a front bottom portion and a rear bottom portion by being folded in half along a crease line, and the front side seat and the front bottom portion are sealed by a side seal, and the back side seat and the rear bottom portion are sealed. A bag having a sealed bottom is known. In this type of bag body, the front side seat and the front bottom portion are sealed by the bottom seal extending generally obliquely upward toward the side seal, and the back side seat and the rear bottom portion are sealed. Is sealed so that the shape of the bag when the stored item is stored is adjusted.

In general, the bottom seal is inclined in a straight line shape or an arc shape so that a bottom line defining the inside thereof reaches an intersection of the crease line and the side line.
On the other hand, in patent documents 1 and 2, the bottom line is made to reach the position below the intersection of the crease line and the side line. In particular, in Patent Document 1, a concave portion is provided on the side seal from the inside of the bag body in order to prevent the bag body from being torn or avoided from the portion where the bottom sheet is joined to the side seal. Proposes a bag body that has a bottom line that extends toward

However, in Patent Document 1, although the concentration of force between the crease line and the front and back sheets is alleviated, the force concentrates on the upper corner of the recess. A new problem arises that a bag breakage occurs from the upper corner of the.
Moreover, in Patent Documents 1 and 2, the bottom line is inclined in a straight line or arc with a specific and relatively steep slope in the region inside the side seal or its extension line. Therefore, the bottom seal with a relatively steep bottom line is connected to the side seal when the vertical positional relationship deviates from the design value between the front and rear seats and the bottom seat. Will be done. As a result, there is a problem in that the bag body is likely to vary in its resistance to breakage.

Japanese Patent Laid-Open No. 11-227790 JP 2003-128082 A

An object of the present invention is to provide a bag body that is provided with a bottom sheet and that suppresses bag breakage from the bottom sheet, the side seal, and the joint portion.
Moreover, this invention makes it a subject to provide the bag body which suppressed the dispersion | variation in the bag-proof performance of a bag body.

The present invention includes a front side sheet and a back side sheet as a body sheet of a bag, and has a bottom sheet disposed between the front side sheet and the back side sheet, The front side seat and the front bottom portion are sealed by a side seal by being folded in half at the crease line, and the back side seat and the rear bottom portion are sealed by a side seal. The front side seat and the front bottom portion are sealed by the bottom seal extending generally obliquely upward toward the side seal, and the back side seat and the rear bottom portion are sealed. Concerning body improvement.

In the bag of the present invention, the bottom line that defines the inside of the bottom seal is, in the lateral direction, a regular edge located in a region far from the side seal and an adjustment edge located in a region close to the side seal. A part. The regular edge and the adjustment edge are located inside the bag body from the side line that defines the inside of the side seal. The adjustment edge portion is connected to the side seal at a lower connection point having a smaller angle of inclination than the regular edge portion and spaced below the crease line. Thereby, a pocket part is formed in the front and back across the crease line. The front and rear pockets are formed along the side seal between the front side seat and the front bottom, and along the side seal between the back side seat and the rear bottom. The gap is formed.

In the present invention, the pocket portion is formed in a region below the crease fold line and inside the side seal. The pocket portion is in a state in which the stored item is put in a bag body and the bottom sheet is opened (that is, the bottom sheet is opened from the crease line and the bottom sheet is folded from the bottom line). Even if it is in a bent state), the opening is creased by the regular crease line, so that it does not bend from the adjustment edge, but along the extension line of the regular edge above it or this extension. It is formed by bending slightly below the line. As a result, in the pocket portion, even when the bottom sheet is opened, the front side sheet and the front bottom portion are kept in contact with or in a state close to the contact state. Similarly, the contact state or the state close to the contact state is also maintained between the back side sheet and the rear bottom portion.

In this state, if a more sudden force is momentarily applied to the bottom sheet due to the bag body falling or the like, this pocket portion is also slightly opened. Is relaxed by opening. Further, the relaxed force is distributed to the entire pocket portion (particularly, the seal portion around the pocket portion such as the side seal and the adjustment edge). As a result, bag breakage from the intersection of conventional general standing pouches etc. (specifically, a momentary large force due to the fall is concentrated on the intersection of the crease line and the side line. As a result, the occurrence of bag breakage due to tears and tears from the vicinity of the crossing point is suppressed.

In the present invention, the bottom and sides of the front and rear pocket portions are defined by the adjustment edge and the side seal, but the adjustment edge that is the bottom of the pocket portion is the regular edge. Since it has a gentler slope than the portion, even when a large force is applied to the bottom sheet, the concentration of force can be effectively relieved and bag breakage can be suppressed.

In addition, even when the vertical position of the front bottom sheet relative to the front sheet and the back sheet is shifted, not only the regular edge but also the adjustment edge is a side that defines the inside of the side seal. Since it is located inside the bag body with respect to the line, the above-described effect of suppressing bag breakage can be maintained.
The normal edge portion is such that an upper imaginary point that is an intersection point between the extension line and the side line is located on or above the intersection point that is the intersection point between the crease line and the side seal. It is desirable to be prescribed in

In the present invention, the adjustment edge is not provided, or the adjustment edge is not directly connected to the regular edge or the side seal, and is broken or broken. However, it is possible to achieve the effect of suppressing the occurrence of broken bags as in the case described above. However, in this bag body, the regular edge of the bottom line that defines the inside of the bottom seal must end before the side line that defines the inside of the side seal. In this case, the uppermost end of the regular edge portion is positioned on the inner side of the bag body with respect to the side line in the horizontal direction and positioned below the crease line in the vertical direction. The normal edge portion has an upper imaginary point that is an intersection point between the extension line and the side line, located above or above the intersection point that is an intersection point between the crease line and the side seal. To be prescribed. Thereby, a pocket part is formed in the front and back across the crease line. The front and rear pockets are formed along the side seal between the front side seat and the front bottom, and along the side seal between the back side seat and the rear bottom. It is a formed gap. And this pocket part can suppress that instantaneous force concentrates on a specific seal | sticker part instantaneously, and can exhibit the effect | action of bag-breaking prevention.

Either the left or right side of the front and rear pockets is defined by the side line, and the other side can be formed along an extension line of the regular edge formed when the bottom sheet is opened, or This is defined by a fold that is slightly below the extension line. Of course, even in this bag, the bottom line can be implemented as having an adjustment edge formed between the uppermost end of the regular edge and the side seal. In this case as well, as in the previous case, it is desirable that the adjustment edge has a smaller angle of gradient than the regular edge.

In the present invention, the form of the adjustment edge can be variously changed, and the normal edge is an upward slope toward the side line with the crease line as a horizontal line, and the adjustment By making the edge part downwardly inclined, it is advantageous because the width that can cope with the shift of the front and rear position of the bottom sheet can be increased.

Further, with the crease line as the horizontal line, the angle of the gradient of the adjustment edge with respect to the horizontal line can be variously changed in consideration of the relationship of the regular edge, etc. Setting within the range is preferable from the viewpoint of avoiding connection with a steep side seal.
The side seal located on the bottom sheet includes a front and rear joint that seals at least two sheets of the front sheet and the back sheet, and at least a part of the front and rear joint is the pocket part. It is also desirable to be located at the same height as from the viewpoint of preventing bag breakage.

The front-rear connecting portion may seal four sheets of the front side sheet, the back side sheet, and the front bottom part and the rear bottom part of the bottom sheet, Only the two sheets of the back side sheet may be sealed. In this case, the side seal located on the bottom sheet can seal the two sheets of the front side sheet and the back side sheet by cutting out the front bottom part and the rear bottom part.

In addition, the said side seal can be implemented as what is sealing the said front side sheet | seat and the said back side sheet | seat directly above the said bottom face sheet | seat.
Furthermore, this invention can be variously changed about the structure of trunk | drum sheets, such as the said front side sheet | seat and the said back side sheet | seat. For example, the shape of the opening is not particularly limited, and can be applied to an apparatus having an opening / closing fastener on both the front side sheet and the back side sheet, and an opening / closing fastener only on one side. The present invention can also be applied to a bag body without a fastener.

The following can be mentioned as an example of the bag body provided with the fastener for opening and closing only on one side. That is, a bag body including a body seat and an opening and closing fastener provided on the seat, the fastener including one and the other fastener halves that can be opened and closed, and the two fastener halves are And a male / female fitting part that is detachably fitted to each other, and a fixing part for the seat, both the male / female fitting part and the fixing part being formed along the longitudinal direction of the fastener. Each of the fastener halves is fixed to the same sheet of the bag that is not separated by the fixing part, and is opened between the fastener halves of the same sheet. It is applicable to a bag body with a fastener that is provided with a portion and the opening portion is cut open so that the bag body is opened.

In the bag body with fasteners, the one fastener half includes a base portion having the lower fixing portion on the front surface and the male and female fitting portions provided on the back surface of the base portion. The other fastener half includes a base having the upper fixing portion on the front and the male and female fittings provided on the front of the base. The base portion of the other fastener half is provided with an intermediate portion, and the intermediate portion has a vertical distance between the male and female fitting portion and the upper fixing portion of the other fastener half. It is the part provided between the said male-female fitting part and the said fixing | fixed part by arrange | positioning apart.

The two fastener halves are fixed to the coplanar sheet by the fixing portions so that the back surface of the one fastener half faces the front surface of the other fastener half. And, in the vertical direction, the opening portion is arranged at a portion including the same position as the intermediate portion, and opens the opening portion and opens the fitting between the male and female fitting portions of the two fastener halves, The bag is opened.

The unsealed portion may include an unsealed portion where at least a range where a fingertip can be inserted is unsealed by cutting a part of the same surface sheet in advance.

The unsealed portion includes a cut portion having a length of 0.7 to 4 cm in the longitudinal direction of the fastener, a cut line having a length exceeding 4 cm in the longitudinal direction of the fastener, and a longitudinal direction and a width direction of the fastener. The present invention can be implemented as at least one of an opening portion having an area opened on the surface.

At least a part of the unsealed part is arranged at a position close to the fixed part on the lower side of the one fastener half, making it easier to insert a user's fingertip from the unsealed part, This is desirable from the viewpoint of promptly performing the initial opening operation.

Specifically, in the state where the upper fixing portion of the other fastener half is pressed from the front side to the back side of the bag body, from the back side of the bag body, in the vicinity of the male and female fitting portions. By pushing the position toward the front side of the bag body, the lower base portion of the one fastener half is opened toward the front side, and the opening of the opened portion is increased, so that the user's fingertip is It can be easily inserted.

The close position is not particularly limited, but the vertical distance between at least a part of the cut portion and the fixed portion on the lower side is preferably 0 to 5 mm, more preferably 0 to 2 mm. It is. In addition, it is preferable that the vertical distance between at least a part of the cut portion and the upper fixing portion is small, but the cut portion is located on the lower fixing portion rather than the upper fixing portion. It is desirable to provide it at a close position. Note that the distance between the upper fixing portion and the lower fixing portion is preferably 6 mm or less.

Moreover, the said opening part can also be implemented as what was provided with the unopened part from which the range which can insert a fingertip will be in an open state by cut | disconnecting a part of said same surface sheet at the time of opening. This unopened portion can be a perforation or a half cut line formed in the same sheet. Further, the same sheet is provided with a directional stretched film, and the same cut sheet is formed so that the easy cut direction showing the straight cut property of the same sheet is a direction along the longitudinal direction of the fastener. By arranging the face sheet, the unopened portion can be formed.

In addition, the opening portion cuts a part of the same surface sheet in advance by cutting a part of the same surface sheet in advance, and at least a portion where the fingertip can be inserted is opened, and a part of the same surface sheet is cut at the time of opening. Therefore, it can be implemented as having both an unopened portion where at least a range in which a fingertip can be inserted is in an opened state. And by forming both continuously, first, a fingertip is inserted into the opened portion, and the unopened portion continuous to this can be easily opened by largely opening the opened portion.

Moreover, the opening seal which closes at least one part of the said opening part can also be provided in the surface side of the said same sheet. With this opening seal, the opening portion, in particular, the opened portion can be closed to improve the sealing performance of the bag body or to exhibit a function of preventing tampering.

In order to enhance the sealing performance of the bag and prevent the fastener halves from being inadvertently released from each other, the other fastener half is provided with a temporary bonding portion. The temporary adhesion portion can be made to have both airtightness and opening by making the adhesion portion weaker than the adhesion between the fixing portion and the same surface sheet.

Moreover, the said opening part shall be provided with the unopened part or the already-opened part, and it can also be made to open by pushing in the said same surface sheet. In that case, the opening may be performed by inserting a finger from the unopened part or the opened part into the same sheet and tearing it. Thus, in response to the operation of pushing the finger into the same sheet and opening it, the base portion of the other fastener half is provided with a convex portion projecting to the front side from the intermediate portion, and the front surface of the convex portion. It is also appropriate to use the upper fixed portion. As a result, the intermediate portion becomes a recessed portion that is recessed to the back side from both the male and female fitting portion and the fixed portion. In the case of performing an initial opening operation by pushing, this concave portion functions as a pushing space. That is, according to the present invention, each of the fastener halves is fixed by the fixing portion to the non-separated coplanar sheet of the bag body, whereby the coplanar sheet and the intermediate portion are fixed. An indentation space is formed between them. And the opening part extended along the longitudinal direction of the said fastener is formed in the said same sheet in the front side of the said intermediate part, and pushes the said same sheet into the said pushing space from at least one part of the said opening part. The present invention also provides a device for opening the opening portion.

Therefore, the initial opening operation in the present invention can be performed as an operation performed on an unsealed portion such as a cut portion formed in advance on the same surface sheet, and the unopened operation that is opened by pushing the same surface sheet. It can also be implemented as being performed at the opening portion.

The coplanar sheet may be formed as one surface of the bag, and may be configured by joining the coplanar sheet itself or a plurality of sheets. It can also be implemented as a single sheet.

In the present invention, in the bag body provided with the bottom sheet, the bag breakage from the bottom sheet, the side seal, and the joining portion can be suppressed.
Moreover, this invention has provided the bag body which suppressed the dispersion | variation in the bag-proof performance of a bag body.

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a front view of a bag body, FIG. 1B is an enlarged cross-sectional view of an essential part of the bag body, and FIG. The principal part expanded sectional view in the position of an opening part, (D) is a principal part expanded sectional view in the position of the opened part of the bag body. (A) is a principal part expanded sectional view which shows the example of a change of the fastener concerning this invention, (B) is a principal part expanded sectional view which shows the other example of a change of the fastener concerning this invention, (C) is this invention. It is a principal part expanded sectional view which shows the other modification of the fastener which concerns on. (A) is a front view of the bag body which concerns on the 2nd Embodiment of this invention, (B)-(F) is a front view of the bag body which concerns on another modification, respectively. It is a front view of the continuous sheet for manufacturing the bag which concerns on the 1st Embodiment of this invention. It is an Example which shows an example of an initial opening operation | movement, (A) is principal part sectional drawing before opening, (B) is principal part sectional drawing during an initial opening operation | movement, (C) is principal part sectional view at the time of completion of initial opening. (D) is explanatory drawing which shows the positional relationship of the opening part and fixing | fixed part seen from the same front, (E)-(G) is explanatory drawing which shows the other positional relationship of an opening part and fixing | fixed part, respectively. is there. (A)-(E) are explanatory drawings which respectively show the form of an opening part. (A)-(D) are explanatory drawings of the combination pattern of the unopened part and opened part in an opening part, respectively. (A)-(C) are explanatory drawings of the combination pattern of the unopened part and opened part in an opening part, respectively. (A)-(G) are explanatory drawings of the form of the unopened part or the opened part in an opening part, respectively. (A)-(D) are explanatory drawings of the form of the unopened part or the unsealed part in an opening part, respectively. (A)-(D) is explanatory drawing of the form of the unopened part or opened part in an opening part, respectively, (E) is explanatory drawing of the form which provided the seal | sticker in the opening part. (A)-(C) are explanatory drawings which show the position which each provides a temporary junction part. (A) is a principal part front view of the bottom part of the bag which concerns on embodiment of this invention, (B) (C) is sectional drawing which shows the sheet | seat structure of a bottom part, respectively. (A) is a principal part enlarged front view of the bottom part of the bag body, (B) is explanatory drawing of the internal structure of the bag body. (A)-(E) are the principal part front views which show the positional relationship of the crease crease line and bottom line in a bag, respectively. (A) And (B) is a principal part front view of the bottom part of the bag body which concerns on other embodiment, respectively. (A) And (B) is a principal part front view of the bottom part of the bag body which concerns on other embodiment, respectively. It is a principal part front view of an Example and a comparative example, (A) is Example 1, (B) is Example 2, (C) is Comparative Example 1, (D) is Comparative Example 2, (E) is a comparison. FIG. 10 is a front view of main parts according to Example 3.

(Overview)
FIG. 1 shows a bag body 31 according to an embodiment of the present invention. This bag body 31 is heat-sealed around two body sheets (a front side sheet 32 and a back side sheet 33). It is a bag body bonded with.

As the front side sheet 32 and the back side sheet 33, a sheet mainly composed of a synthetic resin provided with a single layer or a plurality of layers can be preferably used, and a composite material including a metal layer and a paper layer as necessary. The sheet | seat made from may be sufficient.
The front side sheet 32 and the back side sheet 33 are provided with side seals 61 on both the left and right sides, whereby both sides are joined, but the shape of the bag 31 can be variously changed. For example, it may have a flange on the left and right, and may be a part formed of a highly rigid molded product. The front side sheet 32 may be formed of a separate sheet body from the back side sheet 33, or may be a back-fitted type in which one sheet is folded at two left and right sides and sealed at the center. Good.

A bottom sheet 51 is disposed at the bottom of the trunk sheet (the front sheet 32 and the back sheet 33). This bottom sheet 51 is a sheet folded in half by a crease fold line 52 disposed on the upper side, and a bottom seal 71 that is inclined linearly or arcuately is applied. The most important point of the present invention is the joining structure of the bottom sheet 51 and the trunk sheet (the front side sheet 32 and the back side sheet 33). First, the specific structure of the bag body excluding the bottom sheet 51 is described. An example is demonstrated with reference to FIGS. 1-12, and the description regarding the bottom sheet | seat 51 is given with reference to FIG.

(About fastener 10)
In the bag body 31 according to this embodiment, at least one of the front-side sheet 32 and the back-side sheet 33 (in this example, the front-side sheet 32) among the same-face sheets constituting one surface thereof. ) Is formed with an opening 34. The fixing portion 14 of the first fastener half 11 and the fixing portion 24 of the second fastener half 21 are bonded to the front side sheet 32 by thermal welding or the like on both the upper and lower sides with the opening 34 interposed therebetween. Yes. The first fastener half 11 and the second fastener half 21 constitute a fastener 10 that can be opened and closed by detachably fitting a male and female fitting portion 13 and a male and female fitting portion 23.

Hereinafter, the longitudinal direction of the 1st fastener half part 11 and the 2nd fastener half part 21 which comprise the fastener 10 is called a horizontal direction (or horizontal direction), and the width direction of the 1st fastener half part 11 and the 2nd fastener half part 21 is shown. Are referred to as the vertical direction (or vertical direction), but these only indicate a relative positional relationship and do not specify an absolute position.

(About the second fastener half 21)
First, the second fastener half 21 will be described. The second fastener half 21 is the same as that used for an ordinary synthetic resin fastener, and includes a base 22 and a male / female fitting 23 provided on the back side of the base 22. The entire front surface side or a part in the width direction of the male / female fitting portion 23 constitutes a fixing portion 24, and the fixing portion 24 and the back side of the front side sheet 32 are fixed by adhesion such as heat welding.
In this example, the second fastener half 21 is disposed below the opening 34, but may be disposed above.

(About the first fastener half 11)
Next, the first fastener half 11 is a synthetic resin fastener half that fits into the second fastener half 21, and includes a base 12 and a male-female fitting 13 provided on the front side of the base 12. Is provided. The male / female fitting part 13 is detachably fitted to the male / female fitting part 23 of the second fastener half 21 and is substantially at the same position in the vertical direction as the male / female fitting part 23 of the second fastener half 21. Provided at the bottom of the opening 34. In addition, when the 2nd fastener half part 21 is arrange | positioned above the opening part 34, the male-female fitting part 13 of the 1st fastener half part 11 is also arrange | positioned above. In the example of FIG. 1, the male and female fitting portion 23 of the second fastener half 21 is implemented as a male fitting portion of a ridge, and the male and female fitting portion 13 of the first fastener half 11 is implemented as a female fitting portion. As shown in FIG. 2 (A), the male and female can be reversed, and the male and female fitting portions of the fastener can be changed variously, such as a shape in which a plurality of ridges and grooves are fitted together. Can be implemented. Moreover, you may make it fit several male-female fitting parts so-called a so-called double chuck.

The base portion 12 of the first fastener half 11 is formed over the opening portion 34 in the vertical direction, and the fixing portion 24 is formed above the opening portion 34. The fixing portion 14 of the first fastener half 11 is formed on the front end surface of the convex portion 15 protruding to the front side, and is fixed to the back side of the front side sheet 32 by adhesion such as heat welding. . In this example, in a state where the male / female fitting portion 13 of the first fastener half 11 and the male / female fitting portion 23 of the second fastener half 21 are fitted, the fixing portion 14 of the first fastener half 11 and the second The convex part 15 protrudes in the front side so that the fixing part 24 of the fastener half part 21 becomes substantially the same height. As a result, as will be described later, the opening operation can be performed very smoothly, and thermal welding to the front side sheet 32 can also be reliably performed.

The base portion 12 of the first fastener half 11 includes an intermediate portion 16 between the male and female fitting portion 13 and the fixing portion 14. The intermediate portion 16 is a concave portion recessed on the back side as compared with the male-female fitting portion 13 and the fixing portion 14 (convex portion 15). As a result, a pushing space 39 is formed between the male and female fitting portion 13 and the fixing portion 14 (convex portion 15) between the intermediate portion 16 and the front side sheet 32. An unsealed portion 34 is formed on the front side sheet 32 that is located on the front side of the intermediate portion 16 and the pushing space 39.

(About the opening part 34)
The unsealing part 34 is formed on the front sheet 32 and is sandwiched between the fixing part 14 of the first fastener half 11 and the fixing part 24 of the second fastener half 21 in the vertical direction. Is formed. The unsealed portion 34 includes an unopened portion 35 extending in the lateral direction and an unsealed portion 36 formed at an appropriate position (in this example, the center). In this example, the unopened portion 35 is a perforation formed on the front side sheet 32, and the opened portion 36 is a cut portion formed on the front side sheet 32. It is appropriate that the cut portion has a right and left length of about 7 mm or more, preferably about 10 to 40 mm, with a size that allows a fingertip to enter. The cut portion only needs to be cut in a linear shape, and its vertical width is 0 mm. However, it can be implemented as a vertical width of about several mm to 10 mm.

(About opening operation)
When opening, first, the finger f is pushed from the opened portion 36 into the space 39. In this example, the unsealed part 36 is a cut part that has been cut in advance, and the intermediate part 16 is a concave part as described above, so that the finger f can be pushed into the back side without difficulty. And the unopened part 35 of a perforation can be easily torn by moving the inserted finger f to right and left. Of course, the unopened portion 35 may be broken in a manner of pulling up and down by, for example, picking the front side sheet 32 with a finger inserted into the opened portion 36. In any case, the unsealed portion 36 can be opened very easily by pushing the unsealed portion 36 into the pushing space 39.

(About manufacturing method)
The bag body 31 can be manufactured very easily. Conventionally, this type of fastener 10 includes a first fastener half 11 and a second fastener half 21 fitted to a front side sheet 32 continuously fed in a web shape. The fixing part 14 of the half part 11 and the fixing part 24 of the second fastener half part 21 are bonded and fixed by heat welding or the like. In the embodiment of the present invention, it is only necessary to form the opening part 34 (the unopened part 35 and the opened part 36) on the front side sheet 32 with a push-off device or the like prior to this adhesive fixing. In this way, bonding is performed such that the fixing portion 14 of the first fastener half 11 and the fixing portion 24 of the second fastener half 21 are positioned on both the upper and lower sides of the opening portion 34 formed in advance. Therefore, it is possible to manufacture at low cost without increasing the number of manufacturing steps.

(Other embodiments)
FIG. 3A shows another embodiment. In the previous embodiment, the unopened portion 35 of the unsealed portion 34 was perforated, but in this example, the unopened portion 35 has a straight cut property utilizing the properties of the sheet. In other respects, the description of the previous embodiment can be applied to other points.

In this embodiment, among the sheets constituting the bag body 31, at least the front side sheet 32 includes a stretched film having directionality. In this type of sheet, the straight cut property is exhibited in one direction which is the longitudinal direction of stretching, and the easy cut direction 40 indicating the straight cut property is a direction along the longitudinal direction of the fastener (bag body). The unopened portion 35 is formed by arranging the front side sheet 32 so as to be in the horizontal direction. Therefore, unlike the previous example, in this embodiment, the unopened portion 35 has a configuration indistinguishable from other portions of the front sheet 32, but the opened portion 36 is formed by a cut portion or the like, By pushing the finger f from the opened portion 36 into the space 39 and moving the inserted finger f to the left and right as described above, the unopened portion 35 can be easily broken in the easy-cut direction 40 indicating straight cut performance. Can do.

Although not shown, the unopened portion 35 may be a half cut that is a concave groove formed from the surface of the front side sheet 32 to the middle in the thickness direction. Further, when the front side sheet 32 is a sheet obtained by laminating a plurality of films, as a sheet provided with a weak line in which a film on the surface or inside thereof is cut in advance or a perforation is formed on the film. The unopened portion 35 may be formed by the weak line.
Thus, the unopened part 35 can be implemented by changing to various means that can be easily cut in the direction along the longitudinal direction of the fastener 10.

(Modification example of the opening part 34)
FIG. 3B shows a modification example of the opening part 34. In the previous two embodiments, the opened portion 36 by the cut portion is provided. However, in this example, the opened portion 36 is not provided. The description regarding any embodiment is applicable. In the example of FIG. 3B, the unopened portion 35 is perforated, but the weakest opened portion 37 that can be opened with a force smaller than the perforated portion is provided instead of the opened portion 36.

The weakest opening part 37 is implemented by increasing the number of perforations or increasing the width so that it can be opened with a force smaller than the perforation of the unopened part 35.
Thus, by providing the unopened part 35 and the opened part 36 or the weakest opened part 37 continuously in the longitudinal direction of the fastener 10, easy opening and unnecessary opening of the front side sheet 32 are achieved. It is preferable in terms of prevention. However, on the condition that it can be torn with the finger f, it is configured only by the unopened portion 35 without providing the opened portion 36 or the weakest opened portion 37 (for example, the whole is constituted by uniform perforations). Is also possible (see FIG. 3C). In that case, it can be opened from any part of the opening part 34, but the opening position can also be indicated by an arrow or the like so that the user does not get lost. It is desirable to provide such an indication of the opening position even in other examples.

FIG. 3D shows an example of the second embodiment in which a perforation is adopted for the weakest opening portion 37 and the easy-cut direction 40 showing straight cut property for the unopened portion 35 is the longitudinal direction of the fastener 10. Adopted. FIG. 3E shows an example in which the opened portion 36 (or the weakest opened portion 37) is arranged not at the center of the bag body 31 but at the left and right ends of the front side sheet 32, and FIG. This is an example in which the unsealed portions 36 are arranged at a plurality of locations (both left and right ends).
Thus, about the structure of the opening part 34, the structure, number, size, etc. can be changed variously, and it can implement in various combinations.

(Modification example of the first fastener half 11)
As described above, the convex portion 15 of the first fastener half 11 is projected to a height substantially equal to the thickness of the male / female fitting portion 13 and the male / female fitting portion 23 in the fitted state, Although it is most desirable that the fixing portion 14 and the fixing portion 24 of the second fastener half 21 have substantially the same height, as shown in FIG. It can also be provided. In the example of FIG. 2 (B), the height of the convex portion 15 is set to about one half of the thickness of the male and female fitting portion 13 and the male and female fitting portion 23 in the fitted state. The degree is acceptable. Moreover, it is not impossible to carry out the fixing portion 14 and the intermediate portion 16 at the same height without providing the convex portion 15 at all. However, it is possible to improve the pushing of the opening portion 34, and to the front side sheet 32. From the viewpoint of achieving good adhesion such as heat welding, it is desirable to provide the convex portion 15 for implementation.

(About Figure 2 (C))
Further, in the above-described embodiments, the lengths of the bases 12 and 22 of the fastener halves 11 and 21 to the lower side of the lower end in the figure are substantially the same length. Good. In particular, as shown in FIG. 2C, it is also preferable that the base 12 of the first fastener half 11 extends longer than the base 22 of the second fastener half 21. In this way, in the width direction of the fastener 10 (vertical direction in FIG. 2), the extension portion 17 is provided at the end portion of the base portion 12 of the first fastener half portion 11, and this extension portion 17 is connected to the second fastener half portion 21. The base portion 22 protrudes in the width direction. Thus, when the base portions 12 and 22 of the fastener halves 11 and 21 are thermally welded to the front side sheet 32 at the fixing portions 14 and 12, the extension portion 17 is also lightly heat welded to the front side sheet 32. A temporary joint 18 is formed. In the figure, although the thickness of the temporary joining portion 18 is drawn large, actually, the front side sheet 32, the extension portion 17 and the like naturally bend in the thickness direction. It may be the same as the parts 14 and 24. However, the thickness of the extension portion 17 is different from that of the other fixed portions 14 and 24 (for example, the thickness is increased to ensure that the temporary joining is performed, or the thickness is reduced to adjust the strength of the temporary joining. As well).

As described above, by providing the temporary joining portion 18 by the extension portion 17, even if the male and female fitting portions 13, 23 may come off during storage or transfer of the bag body 31 storing the articles to be stored, There is a high possibility that communication between the inside and outside of the bag body 31 can be prevented by the joint portion 18.

On the other hand, when opening, when the male and female fitting portions 13, 23 are removed from the opening portion 34, the base 12 of the first fastener half 11, the extension portion 17, and the front side sheet 32 are Since it is pulled strongly left and right in the figure so as to be separated from each other, the temporary joining portion 18 of the extension portion 17 is detached, and the inside and outside of the bag body 31 can be communicated.

Accordingly, it is desirable that the temporary joint portion 18 of the extension portion 17 has an appropriate area so as not to be inadvertently removed but to be removed when intentionally opened. Specifically, the extension portion 17 may have a length in the width direction (up and down direction in the drawing) of about 3 to 10 mm, but the present invention should not be understood to be limited to this numerical value.

Further, the material may be devised so that the fixing strength to the front side sheet 32 is made stronger and the fixing portions 14 and 24 are made stronger and the extension portion 17 is made weaker. For example, the entire fastener halves 11 and 12 including the extension 17 are formed of a material having a high welding temperature such as polypropylene, and a material having a low welding temperature such as polyethylene is formed on the front surface of the both fixing portions 14 and 24. Arrange them by laminating films. Then, at least the back side of the front side sheet 32 may be made of a material having a low heat welding temperature, and may be weakly bonded by thermocompression bonding at a temperature that is a polyethylene welding temperature and lower than the polypropylene welding temperature.

(About Figure 4)
When the bag body 31 according to the present invention is industrially mass-produced, a bag having the form of the continuous sheet 51 shown in FIG. Each bag 31 can be manufactured while storing or without storing. This continuous sheet 51 is a front side sheet 32 that can constitute the bag body 31 (or two sheets that are formed into a cylindrical shape by arranging a back side sheet on the back side of the front side sheet 32 and applying left and right side seals as necessary. A plurality of sheets may be continuously arranged in the longitudinal direction (vertical direction in FIG. 4). In this example, the bag body 31 of FIG. 1 can be continuously produced. However, the bag body 31 according to another embodiment may be used. In the continuous sheet 51, the above-mentioned fasteners for opening and closing are arranged at equal intervals for each bag 31 and fixed by fixing portions 14 and 24. Further, unsealed portions 34 (unopened portion 35 and unsealed portion 36, or the weakest unsealed portion 37 (not shown)) are formed on the front side sheet 32 at regular intervals between the fixing portions 14 and 24. The continuous sheet 51 is usually wound and transferred in a roll shape, and in the step of completing the bag body 31, the boundary portion 91 between the bag body 31 and the bag body 31 has a seal on the top of the bag. A bottom seal is applied and the bag body 31 is cut to complete one bag 31 at a time. In general, the boundary portion 91 of the continuous sheet 51 in a continuous state is not preliminarily provided with a top seal and a bottom seal of the bag, but only the bottom seal or both seals are provided. Can be implemented with various modifications.

(About Figure 5)
FIG. 5 shows an example of the opening operation. FIG. 5 shows an example in which the opening from the opening 34 can be easily performed even when the convex portion 15 is not provided.

FIG. 5A shows a state similar to that shown in FIG. In this example, all or a part of the opening part 34 (particularly the opened part 36) is arranged at a position close to the fixing part 24 of the second fastener half 21 (specifically, a position of about 0 to 4 mm). ing. More desirably, the unsealed part 36 is provided closer to the fixing part 24 of the second fastener half 21 than to the fixing part 14 of the first fastener half 11 (see FIG. 5D). When the opened portion 36 is a straight cut portion and is provided in parallel with the fixed portion 24, the entire opened portion 34 (particularly the opened portion 36) is provided at a position close to the above. . When the unsealed portion 36 is formed in a wavy shape (see FIG. 5E), or when it is provided with an inclination although not shown, a part thereof is close to the above. What is necessary is just to arrange | position to a position. In addition, as shown in FIG. 5F, when the opened portion 36 is an opening 41 which will be described in detail later, a part of the opened portion 36 (opening 41) is from the upper end of the fixing portion 24. May be arranged at a lower position, but this case is also included in the position of 0 mm. Even if a part of the unsealed part 36 (opening 41) is located below the upper end of the fixing part 24, the fixing part 24 has the base 22 of the second fastener half 21 in the fixing part 24. Since the size of the opening is defined by the upper side of the fastener base 22 from the upper side of the unsealed portion 36, it is reasonable that the size of the opening is included in the position of 0 mm. Similarly, as shown in FIG. 5G, when a part of the unsealed portion 36 (opening portion 41) is present above the fixing portion 14 of the first fastener half 11, the substantial amount The upper side of the opening is defined by the lower end side of the base 12 of the fastener half 11, and both the upper and lower sides are defined by the bases 12, 22 of the fastener halves 11, 21 in the example of FIG. Will be.
It is also desirable that the positions of the fixing portions 14 and 24 of both fastener halves 11 and 21 be close to each other, specifically, about 6 mm or less.

To open the bag in this state, first, the bag body is pinched from the front and back with the thumb f1 and the index finger f2 of one hand (for example, the right hand). More specifically, the fixing portion 14 is pressed from the front side to the back side of the bag body with the thumb f1, and the vicinity of the male and female fitting portions 13 and 23 is formed from the back side of the bag body with the index finger f2 lying sideways. Pinch by pushing to the front side of the bag. In this state, the index finger f2 is pushed out, the thumb f1 is turned to the back side, and the opening part 34 is opened so that it can be opened. At that time, since the opening portion 34 (particularly, the opened portion 36) is disposed at a position close to the base portion 22, the front side sheet 32 is backed by the base portion 22, so that the waist becomes strong. 22 and the front side sheet | seat 32 open toward the front. Thereby, the opening of the opening part 34 (particularly the opened part 36) is increased, and the thumb f3 of the other hand (for example, the left hand) can be easily inserted. Therefore, the unsealing operation of the unsealing part 34, in particular, the initial unsealing operation can be performed easily and quickly so as not to be compared with a conventional bag with a fastener.

(About FIGS. 6 to 11)
6 to 11 are arrangements of the various configurations described above, and will be described in order for each type.

(About Figure 6)
6 (A) to 6 (E) illustrate the opening portion 34, respectively.

In FIG. 6A, the unsealed portion 34 is configured by only the unsealed portion 36. The unsealed part 36 is constituted by a long cut as a whole. For convenience, a short cut of 4 cm or less is referred to as a cut portion, and a long cut exceeding 4 cm is referred to as a cut line. This cut line may constitute the entire length of the opening portion 34, and as shown in FIG. 6 (B), is constituted by a plurality of cut lines that are portions 38 that are connected without being cut. May be. If the cut line of the opened portion 36 becomes too long, the opened portion 36 may be greatly opened at the time of transfer or the like, and the male / female fitting portion may be opened. Therefore, the connected portions 38 are provided at appropriate intervals. It is also preferable. Moreover, although it is preferable that the opening part 34 reaches the both right and left sides of the bag body 31, the formation position can be changed and implemented suitably, such as providing only in the center of the bag body 31, for example.

FIG. 6C is an example in which the unsealed portion 34 is composed of only unopened portions 35 such as perforations, as in FIG. 3C described above. As shown in FIG. 6D, a plurality of perforations (two in this example) may be provided in parallel. In addition, as shown in FIG. 6E, it is also desirable to arrange the perforations in a staggered manner when a plurality (two in this example) are provided in parallel.
In this way, the unsealed portion 34 can be configured entirely by the same type of the unopened portion 35 and the unsealed portion 36. As described above, the unopened portion 35 and the unsealed portion 36 It can also be configured to be continuously opened in combination.

(About FIGS. 7 and 8)
7 and 8 show patterns in the case where the unsealed portion 34 is configured to include the unopened portion 35, the unsealed portion 36, and the like.

FIG. 7A shows an example in which an opening 41 is provided continuously with respect to an unopened portion 35 such as a linear perforation (or an opened portion 36 such as a cut line). In the description so far, an example in which the opened portion 36 is configured by a linear opening like a cut (a cut portion or a cut line) is shown. However, in this example, the opened portion 36 is formed in the lateral direction (of the fastener 10). This is implemented as an opening 41 that is open not only in the longitudinal direction) but also in the longitudinal direction (width direction of the fastener 10). The opening 41 is formed by punching the front side sheet 32 (same surface sheet) with a mold or the like, and on both the upper and lower sides with respect to the straight unopened part 35 (or the opened part 36). An opening 41 is provided.

In FIG. 7B, an opening 41 is provided so as to protrude upward or downward with respect to an unsealed portion 36 such as one linear cut line. When two straight opened parts 36 are provided in parallel, an opening 41 is provided so as to protrude upward with respect to the upper straight opened part 36, and the lower straight opened part 36 is opened. Although it is natural to provide the opening 41 so as to protrude downward with respect to the finished portion 36, the opening 41 may protrude in any direction.

FIG. 7C shows an example in which the opened portion 36 (cut portion) is provided so as to protrude upward or downward with respect to the opened portion 36 such as one linear cut line. It is. Also in this case, as in the case of FIG. 7B, the opened portion 36 (cut portion) can be provided on either one of the upper and lower sides, or when two straight opened portions 36 are provided in parallel. Can also be applied.

FIG. 7D shows an example in which an unopened portion 35 (perforation) is provided to be curved so as to protrude upward or downward with respect to one linear opened portion 36 (cut line). It is. Also in this case, as in FIG. 7B, the unopened portion 35 (perforation) can be provided on either the upper or lower side with respect to one linear opened portion 36 (cut line). The present invention can also be applied to a case where two straight opened portions 36 (cut lines) are provided in parallel.

Next, FIGS. 8A to 8C are also the same as FIGS. 7B to 7D, and it is possible to adopt one by one. You can also
In FIG. 8A, an opening 41 that has been punched into a semicircular shape is provided continuously with respect to the unopened portion 35 (perforation). FIG. 8B shows a case where an opened portion 36 (cut) curved in a semicircular shape is provided continuously with respect to an unopened portion 35 (perforation). FIG. 8C shows an unopened portion 35 (perforated line) curved in a semicircular shape, which is continuously provided with respect to the straight unopened portion 35 (perforated line). In this case, the curved unopened part 35 (perforation) can be implemented as the above-mentioned weakest unsealed part 37.

(About FIGS. 9 to 11)
When the opening 41, the unopened portion 35, and the opened portion 36 are provided for the unopened portion 35 (or the opened portion 36) on a straight line, these can be implemented as various shapes. Yes, examples are shown in FIGS. 9A is a circle, FIGS. 9B and 9C are semicircular, FIG. 9D is a cross, FIG. 9E is a rectangle, and FIGS. 9F and G are trapezoids. is there. 10A is an example of a polygon such as a hexagon, FIG. 10B is an example of a drum shape, and FIGS. 10C and 10D are examples of a parallelogram. 11A, 11B, and 11C are examples of a triangle, and FIG. 11D is an example of an arrow.

These various shapes are examples for easily performing an initial opening operation such as inserting a fingertip when the deformed portion starts opening, and can be variously changed. It can also function as a tab that serves as a knob after opening. However, when the portion is implemented as the unsealed portion 36 or the opening portion 41 of the unsealed portion 36, it may be unintentionally opened at the time of transfer or the like, as shown in FIG. The seal 42 for hiding the portion can be attached so as to be peelable from the outside of the same sheet (front sheet 32). Thereby, while being able to improve sealing property, the effect of preventing mischief can also be exhibited. The seal 42 may be provided over the entire length of the opening 34 in addition to being provided at the opening start position.

(About Figure 12)
FIG. 12 shows a position where the temporary joint 18 is provided.
FIG. 12 (A) is similar to FIG. 2 (C), in which a temporary joint 18 is provided at the lower end of the base 12, and an unsealed part 34, male and female fitting parts 13, 23, and a temporary joint 18 In this order, they are arranged so as to approach the back of the storage part of the bag. In this example, after opening the opening portion 34, the male / female fitting portion 13 and the male / female fitting portion 23 are disengaged, so that the temporary joint portion 18 can be greatly opened and pulled back and forth of the bag. Even when temporary bonding of the joint 18 is strong, there is an advantage that opening is facilitated.

In FIG. 12B, the temporary joining portion 18 is provided between the opening portion 34 and the male and female fitting portions 13 and 23. In this example, since the temporary joining part 18 is provided in the position close | similar to the opening part 34, there exists an advantage that the force from the outside does not act on the male-female fitting parts 13 and 23 directly.

In FIG. 12C, the temporary joint 18 is provided above and below the male / female fitting part 13 and the male / female fitting part 23. In this example, the male-female fitting parts 13 and 23 can be protected more firmly. As described above, the present invention can be implemented in various combinations of the above-described specific examples, and of course, structures other than the above-described specific examples (for example, fasteners fitted to the front side sheet 32 and the back side sheet 33, respectively). It can be implemented with various modifications, such as those provided, those in which the entire circumference of the bag is closed by heat sealing without providing a fastener, and those in which a discharge port is provided on the joint between sheets or on the sheet surface Is.

(About the bottom sheet 51)
Next, the joining structure of the bottom sheet 51 which is the most important point of the present invention will be described.

The bottom sheet 51 is divided into a front bottom portion 53 and a rear bottom portion 54 by being folded in half at the upper crease line 52. The bottom sheet 51 may be a separate sheet from the front side sheet 32 and the back side sheet 33 as shown in FIG. 13 (B), and as shown in FIG. 32 and the sheet | seat integral with the back side sheet | seat 33 may be formed by bend | folding along a crease line.

(About side seal 61)
The bottom sheet 51 is joined to the front side sheet 32 and the back side sheet 33 by side seals 61. The side seal 61 is a body side seal 62 that joins the front side sheet 32 and the back side sheet 33 at the upper part of the bag body where the bottom sheet 51 does not exist, and the bottom sheet 51 is fixed at the lower part of the bag body. The bottom side seal 63 is joined to another sheet. More specifically, the bottom side seal 63 joins the front side sheet 32 and the front bottom part 53, and joins the back side sheet 33 and the rear bottom part 54 separately.

In general, the front side sheet 32, the back side sheet 33, and the bottom sheet 51 are provided with a film having a high heat melting temperature such as PET or polyamide on the surface side of the bag body 31, and PE or PP on the inner surface side of the bag body 31. It is comprised with the laminated body which has arrange | positioned the film with a low heat melting temperature. Then, the side seal 61 is formed by bonding a film having a low heat melting temperature and heating the mold to a temperature at which the film having a high heat melting temperature is not bonded or by setting the conditions of the ultrasonic horn. Thereby, in the trunk | drum side seal | sticker 62, two films with the low thermal melting temperature of the inner surface side of the front side sheet | seat 32 and the back side sheet | seat 33 are joined. On the other hand, in the bottom side seal 63, the two sheets having a low heat melting temperature on the inner surface side of the front side sheet 32 and the front bottom part 53 are joined together. Two films having a low heat melting temperature are bonded to each other on the inner surface side, but the front bottom portion 53 and the rear bottom portion 54 are in a state where they are not bonded because the films having a high heat melting temperature face each other. In the case where such a laminated sheet is not adopted, a similar joining structure can be obtained by heat-sealing with a heat-resistant plate or the like sandwiched between the front bottom portion 53 and the rear bottom portion 54.

In this way, a finished product can be obtained in a state where the front bottom portion 53 and the rear bottom portion 54 are not joined, but a finished product is obtained in a state where a part of the front bottom portion 53 and the rear bottom portion 54 are joined. This is also common in bags such as standing pouches. Specifically, the bottom sheet 51 is provided with a cut portion at least at a part of the position of the bottom side seal 63 so that the bottom sheet 51 does not exist. Since the bottom sheet 51 (the front bottom portion 53 and the rear bottom portion 54) does not exist at the position of the cut portion, the inner side films of the front side sheet 32 and the back side sheet 33 directly face each other by heat sealing. The joined front and rear joined portions 65 are formed. Thereby, it becomes easy to stand with the bottom part grounded in a stable state with the bag 31 in a state in which the stored item is put.
The present invention can be carried out regardless of the presence or absence of the front-rear joint portion 65, and the following description includes any case unless otherwise specified.

(About bottom seal 71)
The bottom seal 71 is provided in order to define the bottom sheet 51 in a predetermined form. Like the bottom side seal 63, the front side sheet 32 and the front bottom 53 are joined together, and separately from the rear side. The sheet 33 and the rear bottom 54 are joined. In general, as it approaches the side seal 61 in the left-right direction, the whole ascends substantially obliquely upward. The left and right inclined portions may be directly connected to each other at the approximate center of the bag 31 or may be connected via a horizontal portion provided at the approximate center.
The bottom seal 71 may be linearly inclined or may be inclined in an arc shape.

(For side line 64 and bottom line 72: see FIG. 14)
In the present invention, the relationship among the bottom sheet 51, the side seal 61, and the bottom seal 71 is important. Hereinafter, a line defining the inner edge of the side seal 61 will be described as a side line 64, and a line defining the inner edge of the bottom seal 71 will be described as a bottom line 72. The side line 64 is normally a straight line, but when a small concave portion is provided in a part of the straight line, the extended line of the straight line that occupies most of the side seal 61 is the side line 64.

(Regular edge 74 and adjustment edge 75)
As best shown in FIG. 14A , the bottom line 72 according to the present invention includes a straight regular edge 74 and an adjustment edge 75 that is bent with respect to the straight line of the regular edge 74. Is provided. The regular edge 74 specifies the main shape of the side seal 61. In the lateral direction, the regular edge 74 is formed in a region far from the side seal 61, and the adjustment edge 75 is formed in a region near the side seal 61. Is done. In other words, the adjustment edge 75 adjusts the angle at which the regular edge 74 is connected to the side seal 61, and the regular edge 74 is connected to the side line 64 via the adjustment edge 75. Since the regular edge portion 74 is set mainly for adjusting the shape of the bottom of the bag, it often has a relatively steep gradient of about 30 to 60 degrees. When this steep regular edge 74 intersects the side line 64 directly, stress tends to concentrate at the intersection. Therefore, the adjustment edge 75 is assumed to have a smaller angle of gradient than the regular edge 74 so as to alleviate stress concentration. The inclination angle can be variously changed. However, it is preferable that the crease line 52 is a horizontal line, and the inclination angle of the adjustment edge 75 with respect to the horizontal line is within a range of ± 24 degrees.

(Example of FIG. 14)
As shown in FIG. 14, the angle of the gradient of the adjustment edge 75 shows a negative value (specifically, shown as 10 degrees). In other words, the bottom line 72 includes a top portion 73 between the regular edge portion 74 and the adjustment edge portion 75, and the top portion 73 is located at the uppermost position in the bottom line 72. Therefore, the regular edge 74 has an upward slope and the adjustment edge 75 has a downward slope toward the side line 64 with the crease line 52 as a horizontal line.

In this example, since the adjustment edge portion 75 is located below the fold crease line 52, pocket portions 81 are formed on the front and rear sides of the fold crease line 52. More specifically, the pocket portion 81 has a gap formed between the front side sheet 32 and the front bottom portion 53 of the bottom sheet 51, and between the back side sheet 33 and the rear bottom portion 54 of the bottom sheet 51. It is a formed gap. The bottom 82 of the front and rear pockets 81 is defined by being closed by an adjustment edge 75, and the side 83 of the pocket 81 is defined by being closed by a side line 64.

In this state, when the stored item is stored in the bag body 31, as shown in FIG. 14B, the fold crease line 52 of the bottom sheet 51 is opened in an extended state. The crease 78 is attached under the influence of the regular edge 74 occupying most of the area. The crease 78 is along the extension line of the regular edge 74 or between the extension line and the crease crease line 52, but in the pocket portion 81, which is a part below the crease 78, the bottom sheet 51. Is not opened greatly, and the front side sheet 32 and the front bottom 53 of the bottom sheet 51 are in contact with each other or close to contact, and similarly, the back side sheet 33 and the rear bottom 54 of the bottom sheet 51 are in contact with each other. Maintain state or close to contact.

Further, when the bag body 31 falls or the internal pressure of the bag body 31 rises and a force larger than the stationary state is suddenly applied to the bottom sheet 51, this force causes the pocket portion 81 to be slightly opened. It is absorbed and relaxed. Further, the relaxed force is dispersed in the side line 64, the adjustment edge 75, and the like in the pocket portion 81, and is concentrated on one point. Therefore, the occurrence of bag breakage due to tears or tears from the joint between the bottom sheet 51 and the side seal 61 in the vicinity of the crease line 52 is suppressed.

(Relationship between three points)
Here, in order to show the relationship among the crease crease line 52 of the crease crease line 52, the side seal 61, and the bottom seal 71, three points are defined.

First, a point where the crease line 52 intersects with the side line 64 of the side seal 61 is defined as a fold intersection 55.
Second, the upper virtual point 76 is a point where the extension line of the normal edge 74 intersects the side line 64 of the side seal 61.
Third, a point where the adjustment edge 75 intersects the side line 64 of the side seal 61 is a lower connection point 77.

As described above, as a result of the inclination angle of the adjustment edge portion 75 being smaller than that of the regular edge portion 74, the upper virtual point 76 is always positioned above the lower connection point 77.
When the position of the crossing point 55 is examined under this condition, it can be roughly divided into five modes shown in FIGS.

(A) is a mode in which the crossing point 55 is located below the upper virtual point 76 and the lower connection point 77.
(B) is an aspect in which the crossing point 55 is at the same position as the lower connection point 77.
(C) is a mode in which the crossing point 55 is located between the upper virtual point 76 and the lower connection point 77.
(E) is an aspect in which the crossing point 55 is at the same position as the upper virtual point 76.
(F) is a mode in which the crossing point 55 is located above the upper virtual point 76 and the lower connection point 77.

As described above, the inclination angle of the adjustment edge 75 with respect to the crease line 52 is preferably within a range of, for example, ± 24 degrees. Therefore, in the example of FIG. Although the case where the adjustment edge 75 is parallel) is shown, the same can be considered when the slope is either positive or negative.

As a result of many trials and errors and inferences, the present inventor has reached the following conclusion.
In (A), the pocket portion 81 is not formed, and the force concentrates on the intersection of the crease fold line 52 and the bottom line 72 of the bottom sheet 51, and therefore, bag breakage is likely to occur.
In (B), the pocket portion 81 is not formed, and the crease crease line 52 of the bottom sheet 51 and the lower connection point 77 coincide with each other, and force is concentrated on this point.
In (C), since the pocket part 81 is formed, a broken bag can be suppressed.
In (E), since the pocket part 81 is formed, a broken bag can be suppressed.
In (F), the pocket portion 81 is formed. However, since the intersection point 55 is located above the pocket portion 81, the force concentrates on the intersection point 55, and as a result, bag breakage is likely to occur.

Further, the bottom of the pocket portion 81 does not necessarily have to be entirely closed by the seal of the adjustment edge 75. Even if a part or the front portion of the adjustment edge 75 does not exist, the bag breaks. It was confirmed that the effect of suppressing the above is obtained. This is formed between the pocket portion 81 (a gap formed between the front side sheet 32 and the front bottom 53 of the bottom sheet 51 and a rear bottom 54 of the back side sheet 33 and the bottom sheet 51. As described above, even if a large force is applied, the pocket portion 81 is opened to relax the force, and the relaxed force is the intersection of the crease fold line 52 and the side line 64. The inventor believes that the force is distributed to the side seal 61 in the region between the crossing point and the lower connection point 77. Therefore, even if it exists in the form shown in FIG.16 and FIG.17, the effect which suppresses bag breakage can be acquired. However, it is not preferable to form an acute-angle seal portion as shown in FIG. 17A, and it is preferable to apply a process such as rounding as shown in 17B. Further, in the case of FIGS. 16B, 17A, and 17B where the seal is not applied to the bottom end, a hole is opened in the bag, but particles larger than this hole are accommodated. For such applications, it can be used as an air vent hole, and it may be sealed so as to close the hole at an appropriate position as shown in FIG.

(Regarding the slope of the adjustment edge 75)
The slope of the adjustment edge 75 has a horizontal crease line 52 as a horizontal line, an upward slope (the slope angle is positive) as it approaches the side line 64, a horizontal slope (the slope angle is 0 degrees), and a downward slope. It can be assumed that the gradient (gradient angle is negative). In any of these aspects, the force can be distributed according to the above-described three-point relationship. However, the vertical positional relationship of the bottom sheet 51 with respect to the front sheet 32 and the back sheet 33 is often not stable regardless of the manufacturing method. On the other hand, the fusion mold for performing each seal is made in a fixed shape, or even if fine adjustment is possible, it is necessary to stop the production line one by one to change this.

Therefore, there is a slight deviation between the design value and the actual product, and there is a deviation between the products due to the meandering of the sheet.
In consideration of this point, it is preferable that the distance between the upper virtual point 76 and the lower connection point 77 is large. However, in order to increase the distance, the angle of the regular edge 74 is extremely steep, or the adjustment edge is adjusted. Increasing the length of the portion 75 causes adverse effects such as adversely affecting the degree of opening of the bottom sheet 51.

Therefore, in order to increase the distance between the upper virtual point 76 and the lower connection point 77, it is most desirable that the slope of the adjustment edge 75 is a downward slope (negative slope angle) as it approaches the side line 64. Next, it is desirable to set it horizontal (gradient angle 0 degree). However, it is preferable that the regular edge portion 74 and the adjustment edge portion 75 be continuously continuous from the viewpoint of dispersion of force, and it is also desirable to provide a round at the connection portion between the regular edge portion 74 and the adjustment edge portion 75. It is also possible to carry out as climbing gradient (positive gradient angle).

(About the front and rear joint 65)
As described above, in order to realize easiness of standing a general standing pouch or the like, it is often performed by forming the front and rear joint portions 65. The front / rear joint 65 for this purpose is generally provided in the vicinity of the bottom end of the bag. However, the inventor does not use the front / rear joint 65 to prevent the opening, but instead uses the front / rear joint 65. It has also been found that the bag-breaking prevention effect can be improved depending on the formation position. Specifically, at least a part of the front / rear joint portion 65 provided on the bottom side seal 63 is set to the same height as the pocket portion 81. The front / rear joint portion 65 is provided near the upper portion of the bottom sheet 51 and is located relatively far from the bottom end of the bag. Therefore, the front / rear joint portion 65 plays a major role in realizing easiness of standing pouches and the like. Although it is not a thing, it is effective in stabilizing the form of the pocket part 81, and it is thought that the bag-breaking prevention effect improves as a result.

Hereinafter, in order to enhance the understanding of the present invention, two examples are shown together with three comparative examples, but the present invention should not be understood to be limited to these examples.

(Basic form of bag)
The basic form of the bag body is a rectangular shape with the length x width = 29 cm x 22 cm when viewed from the front, and the bottom sheet (length x width = 10 cm x 22 cm) is folded in two at the bottom, 4 cm from the top. It is a bag body which provided the fastener for opening and closing in the position.

The front side sheet, back side sheet, and bottom sheet are used as a laminate sheet of PET film (12 μm thick) and LLDPE film (70 μm thick), and the PET film is placed on the front side of the bag to form a bag. did. The side seal 61 has a left and right width of 7 mm.

(Example 1: see FIG. 18A)
In the first embodiment, the bottom seal 71 is formed in the same form as that of FIG. 15C described above, the crease line 52 is a horizontal line, the inclination angle of the regular edge portion 74 is 45 degrees, and the adjustment edge portion. The inclination angle of 75 is 0 degree (horizontal), and a slight radius is added to the intersection of the regular edge portion 74 and the adjustment edge portion 75. The lower connection point 77 of the adjustment edge portion 75 is positioned at a position 4 mm below the position of the crease line 52 in the side line 64. The front / rear joint portion 65 is provided with a width of 4 mm in the vicinity of the bottom of the bag body in accordance with a conventional method, and is provided at the same vertical position as the pocket portion 81 with the same width.

(Example 2: See FIG. 18B)
Although it is the same form as Example 1, the front-rear joint part 65 was only provided in the vicinity of the bottom part of the bag body in accordance with a conventional method, and was not provided in the same vertical position as the pocket part 81 thereabove.

(Comparative example 1: see FIG. 18C)
Comparative Example 1 is substantially the same as the bottom seal 71 employed in the most common standing pouch, and is provided with only the regular edge 74 with the crease line 52 as a horizontal line and an inclination angle of 45 degrees. The regular edge 74 intersects the intersection of the crease line 52 and the side line 64. The front / rear joint 65 was provided only near the bottom of the bag according to a conventional method.

(Comparative example 2: see FIG. 18D)
Comparative Example 2 is the same as Patent Document 1 presented above, and is formed with a concave portion 101 having a substantially semicircular shape with a radius of 3 mm that is recessed outward from the side line 64. A normal edge portion 74 having an inclination angle of 45 degrees with respect to the crease crease line 52 as a horizontal line was formed, and its tip reached the recess 101 and was connected to the side seal 61. The front / rear joint 65 was provided only near the bottom of the bag according to a conventional method.

(Comparative example 3: see FIG. 18E)
In Comparative Example 3, the bottom seal 71 has the same form as that of FIG. 15B described above, and the inclination angle of the regular edge portion 74 is 45 degrees with respect to the crease line 52 as a horizontal line, and the adjustment edge portion. The inclination angle of 75 is 0 degree (horizontal), and a slight radius is added to the intersection of the regular edge portion 74 and the adjustment edge portion 75. The lower connection point 77 of the adjustment edge portion 75 is positioned at the same position as the position of the crease line 52 in the side line 64. The front / rear joint 65 was provided only near the bottom of the bag according to a conventional method.

(Bag drop test)
Prepare four bags for each of the examples and comparative examples, each containing 2.0 kg of rice grains and with the fasteners closed, with the bottom facing down and the natural floor from a height of 1.7 m. I dropped it.

The drop test was repeated for each bag, and the drop test was continued until a broken bag was visually confirmed. Table 1 shows the results.

In Table 1, for each of the examples and comparative examples, the average value of the number of drops in which broken bags were not visually confirmed, the maximum number of drops in which broken bags were not visually confirmed, and broken bags were not visually confirmed. The minimum number of drops. However, the maximum number of drops was 12 and no further drop test was performed. Therefore, in Examples 1 and 2 including those in which no broken bag was visually confirmed even after dropping 12 times, the average value and the maximum value were displayed as “more than”.
In Examples 1 and 2, excellent resistance to bag breakage was confirmed as compared with Comparative Examples 1 to 3, and in comparison with Examples 1 and 2, in Examples 1 and 2, the front and rear joints 65 were pocketed. It was confirmed that a more advantageous result can be obtained by providing the same at the same vertical position as the portion 81. In Comparative Example 2, it was confirmed that not the bag breakage from the bottom seal 71 but the bag breakage from the upper corner 102 of the recess 101 occurred.

DESCRIPTION OF SYMBOLS 10 Fastener 11 1st fastener half part 21 2nd fastener half part 13, 23 Male and female fitting part 31 Bag body 32 Front side sheet 33 Rear side sheet 34 Opening part 35 Unopened part 36 Opened part 37 Weakest opened part 51 Bottom Seat 52 crease line 53 front bottom 54 rear bottom 55 crossing point 61 side seal 62 trunk side seal 63 bottom side seal 64 side line 65 front and rear joint 66 cutting part 71 bottom seal 72 bottom line 73 top part 74 regular edge Part 75 Adjustment edge 76 Upper virtual point 77 Lower connection point 81 Pocket part 82 Base 83 Side

Claims (6)

While having a front side sheet and a back side sheet as the body part sheet of the bag, and having a bottom sheet disposed between the front side sheet and the back side sheet,
The bottom sheet is divided into a front bottom part and a rear bottom part by being folded in half at the crease line,
With the side seal, the front side seat and the front bottom are sealed and the back side seat and the rear bottom are sealed,
In the bag body in which the front side seat and the front bottom portion are sealed and the back side seat and the rear bottom portion are sealed by a bottom seal extending substantially obliquely upward toward the side seal as a whole.
The bottom line that defines the inside of the bottom seal is, in the lateral direction, a straight regular edge located in a region far from the straight side seal, and an adjustment edge located in a region near the straight side seal. With
The adjustment edge includes a portion bent with respect to the straight line of the regular edge, thereby adjusting the angle of the bottom line with respect to the linear side seal,
The regular edge and the adjustment edge are located on the inner side of the bag body than the linear side line that defines the inner side of the linear side seal,
The adjustment edge is connected to the linear side seal at a lower connection point having a smaller angle of inclination than the regular edge and spaced below the crease line,
Pocket portions are formed on the front and rear sides of the crease line, and the front and rear pocket portions are formed along the straight side seals between the front seat and the front bottom portion. And a gap formed along the side seal that is linear between the back-side seat and the rear bottom portion, and the bottom sides of the front and rear pocket portions are defined by the adjustment edges, The side of the pocket portion is defined by the straight side line,
It said normal edge, upper virtual point is an intersection of the extension line thereof of the straight line and the straight the sideline, the gore gore intersection or on the an intersection of the fold line and the straight of the side seals It is specified to be located above the intersection of
The linear side seal located on the bottom sheet includes a front and rear joint that seals at least two sheets of the front sheet and the back sheet, and at least a part of the front and rear joint is the pocket. A bag with a bottom surface, which is located at the same height as the portion. While having a front side sheet and a back side sheet as the body part sheet of the bag, and having a bottom sheet disposed between the front side sheet and the back side sheet,
The bottom sheet is divided into a front bottom part and a rear bottom part by being folded in half at the crease line,
With the side seal, the front side seat and the front bottom are sealed and the back side seat and the rear bottom are sealed,
In the bag body in which the front side seat and the front bottom portion are sealed and the back side seat and the rear bottom portion are sealed by a bottom seal extending substantially obliquely upward toward the side seal as a whole.
The bottom line defining the inside of the bottom seal is a straight regular edge ending before the straight side line defining the inside of the side seal, and the regular edge and the linear side seal. An adjustment edge formed in between, and a top portion located at the uppermost position of the bottom line ,
The adjustment edge includes a portion bent with respect to the straight line of the regular edge, thereby adjusting the angle of the bottom line with respect to the linear side seal,
The adjustment edge has a smaller angle of gradient than the regular edge,
The top portion is located on the inner side of the bag body than the side line that is linear in the lateral direction, and is located below the crease line in the longitudinal direction,
It said normal edge, upper virtual point is an intersection of the extension line thereof of the straight line and the straight the sideline, the gore gore intersection or on the an intersection of the fold line and the straight of the side seals It is specified to be located above the intersection of
Pocket portions are formed on the front and rear sides of the crease line, and the front and rear pocket portions are formed along the straight side seals between the front seat and the front bottom portion. And a gap formed along the linear side seal between the back side seat and the rear bottom,
The bottom side bag body characterized in that the bottom sides of the front and rear pocket portions are defined by the adjustment edge portions, and the side sides of the front and rear pocket portions are defined by the straight side lines. The bag with a bottom according to claim 1 or 2, wherein the regular edge portion is an ascending slope and the adjustment edge portion is a descending slope toward the side line with the crease line as a horizontal line. body. The bag body with a bottom according to any one of claims 1 to 3, wherein an angle of a gradient with respect to the horizontal line is within a range of ± 24 degrees with the crease line as a horizontal line. The bag with a bottom surface according to any one of claims 1 to 4, wherein the side seal directly seals the front side sheet and the back side sheet above the bottom sheet. A fastener for opening and closing is provided on one of the front side seat and the back side seat,
The fastener includes an openable and closable half and the other fastener half.
The fastener halves include a male / female fitting part that is detachably fitted to each other, and a fixing part for the seat,
The male-female fitting part and the fixing part are both formed along the longitudinal direction of the fastener,
The one fastener half includes a lower fixing portion, and the other fastener half includes an upper fixing portion located above the lower fixing portion,
Both fastener halves are fixed to the same sheet of the bag body that is not separated by the fixing portions.
An opening is provided between the two fixed parts of the two fastener halves in the same sheet, and the bag is opened by opening the opening.
The one fastener half includes a base portion having the lower fixing portion on the front surface, and the male and female fitting portions provided on the back surface of the base portion,
The other fastener half includes a base portion having the upper fixing portion on the front surface, and the male and female fitting portions provided on the front surface of the base portion,
The base of the other fastener half comprises an intermediate portion;
The intermediate portion is configured such that the male and female fitting portions of the other fastener half and the upper fixing portion are spaced apart from each other in the vertical direction. It is a part provided between,
The two fastener halves are fixed to the coplanar sheet by the fixing portions so that the back surface of the one fastener half and the front surface of the other fastener half face each other.
In the vertical direction, the opening portion is arranged in a portion including the same position as the intermediate portion,
The bag body is opened by opening the opening portion and opening the fitting between the male and female fitting portions of both fastener halves. The bag body with a bottom face of description.