JP2005200036A - Paper bag with valve opening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging paper bag which can easily and firmly close a valve opening after filling content with no loss in advantages of known packaging paper bags, and which can be manufactured by forming the valve opening without folding a paper piece for the valve opening in a cylindrical shape, and by reducing the use of thermoplastic resin for manufacture such as hot melt. <P>SOLUTION: The packaging paper bag 10 has a valve opening side bottom face 11 to fill content by using a filling nozzle 15 and an unsealing side bottom face 13 having an unsealing means, and a part in which the filling nozzle 15 is inserted is formed by arranging one valve sheet on a development surface of a manufacturing step. By pulling the valve sheet upwardly with respect to the paper bag 10, the part is opened as the valve opening in which the filling nozzle 15 is inserted. The filling nozzle 15 is inserted in the valve opening 14, the content such as powder can be filled inside from outside, and the valve opening 14 can be sealed inside after the content is filled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a paper bag for packaging. More specifically, the present invention relates to a paper bag for packaging powder and granules, and more particularly to a paper bag having a valve port for injecting the powder and granules at one end.

Patent 3360800 JP2003-160144

  Conventionally, as a paper bag for packaging having a valve opening, a so-called double-bottom glue pasting bag or the like is used in which the end of a paper tube is folded to form the bottom or both bottoms. The present applicant has disclosed such a double-sided bag for packaging that reliably prevents leakage of such a paper bag, even when fine powder is packaged, and that is less expensive than conventional ones. Yes. For example, a paper bag 110 as shown in FIG. The bottom surface of the paper bag 110 having the valve is formed as follows. First, one side 102 near the opening of the folded paper tube 101 is valley-folded along a first fold line a parallel to the edge while forming triangular development surfaces 103 and 103 at both corners. And develop into a hexagonal shape so as to form a rectangular opening 104 at the center. Subsequently, the valve paper 107 formed in a cylindrical shape in advance is attached to one of the folding portions 103. Then, the first folding line a is placed on the left and right development surfaces 103 and 103 so that the first folding line a is centered on the closing paper piece 106 having a width wider than the interval between the second folding lines b parallel to the edge 105 of the opening 104. Paste parallel to At this time, the end of the valve paper 107 protrudes from the closing paper piece 106. After that, the edge 105 is folded in a mountain along the second fold line b, and is overlapped. Further, it is formed by sticking a rectangular decorative paper 109 (bottom force paper) having a slightly smaller area than the bottom end portion to the obtained bottom end portion 108.

In such a paper bag, a thermoplastic adhesive such as hot melt is applied to the entire inner surface of the tubular valve paper 107, and after filling the contents, heat sealing is performed from above the tubular valve paper 107. The valve mouth was closed. However, in this case, the surfaces to which the hot melt is applied must be bonded to each other, and a poorly bonded portion is likely to occur due to insufficient cooling.
In order to solve such a problem, the present applicant has disclosed in Patent Document 2 that the upper surface on the outer side of the opening end of the valve port protrudes from the lower surface to be a protruding piece, and a hot melt or the like is formed on the inward side of the protruding piece. It proposes a paper bag provided with a thermoplastic adhesive.

  The present invention can easily and firmly close the valve port after filling the contents without losing the advantages of the conventional packaging paper bag, and forms the valve port without folding the paper piece for the valve port into a cylindrical shape. Providing a paper bag for packaging is a technical issue, and it is a method that replaces the conventional way of thinking.

The wrapping paper bag of the present invention (Claim 1) is configured to fold the upper end of a flat folded paper tube along a first fold line parallel to the upper end to form an upper surface and a lower surface of the open end, The upper surface of the opening end is expanded so as to form a development surface having a triangular folded portion formed at both corners around the first folding line and a rectangular opening formed at the center, The bottom surface is on one folding part on the development surface, so that one end extends beyond the inner edge of the folding part to the opening, and the other end is on both side edges. After the valve seat is placed so as to protrude from the intersection of the side edges of the trapezoid formed by folding the mountain, the sides of the both sides are folded to form a communication between the outside and inside of the paper bag. Means for sealing between the valve seat and one of the folding parts is provided. It is characterized in Rukoto.
In such a paper bag, it is preferable that the means for sealing between the valve sheet and the one folded portion is thermocompression bonding of a thermoplastic adhesive provided between the valve sheet and the folded portion ( Claim 2). Furthermore, it is preferable that the other end portion of the valve seat protrudes from the bottom surface, and the width thereof is cut to be the same as or slightly larger than that between the second folding lines. Further, after the valve seat is placed on the development surface, a closing paper piece is placed on the valve seat so as to cover the boundary line between the one folded portion and the opening between the second folding lines. Is preferably pasted (claim 4). Further, it is preferable that the other end portion of the valve seat protrudes from the bottom surface, and a decorative paper having a slightly smaller area than the bottom surface is pasted on the bottom surface.

In the paper bag for packaging according to the present invention (Claim 1), the valve seat is disposed on one of the triangular folded portions so as to extend to the opening beyond the inner edge of the folded portion. Further, when both sides of the development surface are folded and glued from the second folding line to form the bottom of the bag, the inside of the bag communicates with the outside between the valve seat and the triangular folded portion. . That is, the space between the valve seat and the triangular folded portion functions as a conventional valve. Therefore, it is not necessary to make the valve paper for the valve opening into a cylindrical shape unlike the conventional case. As a result, it is possible to reduce the amount of thermoplastic adhesives such as paper and hot melt that are used as compared with conventional ones. Furthermore, the bulk of the bottom surface can be kept low. Thereby, it is a leak path of the contents, such as powder, and the part of the 2nd broken line which tends to produce poor adhesion can be adhered firmly. Moreover, since it is only necessary to mount the valve seat on the development surface, the production process can be reduced as compared with the conventional case, and the manufacture is easy.
In addition, when filling the contents such as powder from the outside using a filling nozzle or the like, the user of the paper bag protrudes from the intersection of the side edges of the trapezoid formed by folding the both side edges of the development surface. The valve seat can be opened easily (valve port) just by grabbing the end of the valve seat and pulling it lightly upward against the bottom surface. high. Further, even if the end portion of the valve seat is not pinched, the filling nozzle is placed between the sides of the trapezoid formed by folding the development surface in a mountain and inserted between the valve seat and the folding portion. be able to. Furthermore, since it has a means for sealing between the valve seat and the folded-in portion, the paper bag can be sealed after filling the contents, and leakage of the contents from the valve port is prevented.

  In such a paper bag, when a thermoplastic adhesive such as hot melt is provided between the valve sheet and one of the folded portions, after the contents are filled, thermocompression bonding is performed from above the valve sheet ( The valve seat and the one folded portion can be bonded together by simply performing heat sealing. In this case, the area between the valve seat and one of the folded portions can be increased, and the sealing performance is high.

Moreover, when the said valve | bulb sheet | seat protrudes from the bottom face, it is easy to grasp the protrusion part and is easy to insert the nozzle for filling. Furthermore, when the width of the protrusion is cut to be the same as or slightly larger than the second folding line, the diameter of the valve port for filling the contents can be maximized, and the filling efficiency of the contents is high ( Claim 3).
After placing the valve seat on the development surface, a closing paper piece is pasted on the valve seat so as to cover the boundary line between the one folded portion between the second folding lines and the opening. When attached, the site on the second fold line where adhesion failure is likely to occur can be firmly adhered (Claim 4).
Moreover, when the end of the valve seat protrudes from the bottom surface and a decorative paper having a slightly smaller area than the bottom surface is pasted on the bottom surface, the effect of preventing leakage is further improved. At this time, since the valve sheet protrudes from the bottom surface, the space between the valve sheet communicating with the inside and the outside of the paper bag and the folding portion is not closed by the decorative paper.

  Next, embodiments of the paper bag for packaging according to the present invention will be described with reference to the drawings. 1a is a perspective view showing a paper bag of the present invention, FIG. 1b is a partially enlarged view showing when the valve port of FIG. 1a is opened, and FIG. 2 is a process diagram showing a manufacturing procedure of the bottom surface of the paper bag of FIG. 3 is a process diagram showing the manufacturing procedure of the bottom side of the unsealed side of the paper bag of FIG. 1, FIG. 4a is a bottom view showing another form of the closing paper piece used in the paper bag of the present invention, and FIG. FIG. 5a is a bottom view showing still another form of the closing paper piece used in the paper bag of the present invention, and FIG. 5b is a view when the closing paper piece is attached to the development surface. FIG. 6A is a bottom view showing still another form of the closing paper piece used in the paper bag of the present invention, and FIG. 6B is a plan view when the closing paper piece is attached to the development surface.

  A packaging paper bag 10 shown in FIG. 1a is a rectangular parallelepiped, and includes a valve mouth side bottom surface 11 having a protruding portion 12 at one end and an opening side bottom surface 13 provided with an opening means. Further, the paper bag 10 can be pulled upward with respect to the paper bag 10 to open the bottom of the projecting portion 12 to obtain a valve port 14 that communicates the inside and the outside of the paper bag 10. By inserting the filling nozzle 15 into the valve port 14, the contents such as powder can be filled from the outside to the inside (see FIG. 1b).

A process of manufacturing the valve port side bottom surface 11 of the paper bag 10 is shown in FIG. First, as in the prior art, the upper end of the flat folded paper tube is valley-folded along a first fold line a parallel to the upper end to form the upper and lower surfaces of the open end, and then the upper surface of the open end Are expanded so that triangular folds 21a and 21b formed at both corners around the first fold line and a rectangular opening 22 formed at the center are formed. Next, hot melt is applied to the entire lower surface, and a rectangular valve seat 16 having a width substantially the same as that between the pair of second folding lines b is prepared. The valve seat 16 is disposed so as to extend to the opening 22 beyond the inner edge of one folding part 21 b of the development surface 20. That is, one end portion 16a of the valve seat 16 closes a boundary line 26b between one fold portion 21b and the opening portion 22 between the second fold lines, and the other end portion 16b protrudes from the fold portion 21b (S1). . The other end 16b of the protruding valve seat is the protruding portion 12, and the valve opening 14 is between the valve seat 16 and the folding portion 21b.
Thus, by arranging the valve seat 16 so that the protruding portion 12 protrudes from the folding portion 21b, the protruding portion 12 protrudes from the bottom surface of the paper bag, and is easily grasped after manufacturing the paper bag. Therefore, the valve port 14 can be easily opened, and the filling nozzle 15 can be easily inserted into the valve port 14.
The width of the valve seat 16 may be slightly larger than the interval between the second folding lines b. Also in this case, the diameter of the valve port is substantially the same as that between the second bent lines b.

On this, the closing paper piece 25 is pasted around the first folding line a, parallel to the first folding line a, and so as to block both boundary lines 26a and 26b surrounded by the second folding line b (S3). At this time, the closing paper piece 25 is also attached to the upper surface of the valve seat 16. Here, the valve seat 16 is held by the closing paper piece 25. Before the closing paper piece 25 is pasted, paste is applied to the hatched portion 23 on the development surface corresponding to the closing paper piece 25 and other than the rectangular portion surrounded by the second folding line b and the boundary line 26. (S2). Conversely, glue may be applied to a region corresponding to the hatched portion 23 of the closing paper piece 25.
Thereafter, both side edges 20a and 20b of the development surface 20 are formed along the second folding line b so that trapezoids formed by the both side edges 20a and 20b and the second folding line b are formed. The bottom end 27 is formed by stacking together so as to overlap each other. Finally, a decorative sheet 28 having a size slightly smaller than the bottom end is pasted on the bottom end 27 to obtain the valve port side bottom 11 (S4).
In this embodiment, the valve seat 16 is placed so that one end of the valve seat 16 protrudes from the folding portion 21b to become the protruding portion 12. However, like the protruding portion 12b indicated by an imaginary line in step S4, the trapezoidal intersection point is formed. If it protrudes from 20c, it does not necessarily have to protrude from the valve port side bottom surface 11.

  The valve port side bottom surface 11 thus obtained can open the valve port 14 (between the valve seat 16 and the folding portion 21b) by pulling the protruding portion 12 upward with respect to the paper bag 10. Normally, the filling nozzle 15 is inserted into the valve port 14 that is somewhat open (the opening between the valve seat 16 and the folding portion 21b). After filling the valve port 14 with powder or the like, the valve-side bottom surface 11 of the paper bag 10 is thermocompression bonded so that the hot melt applied to the valve seat 16 seals between the valve seat 16 and the folding portion 21b. To do. That is, the valve port 14 can be closed and the paper bag 10 can be sealed. As described above, the valve port of the paper bag of the present invention has high sealing performance because the surfaces to which hot melt is applied are not thermocompression-bonded like the conventional cylindrical valve port. Furthermore, the bulk of the valve port side bottom surface can be kept low.

Further, the protrusion 12 may be thermocompression bonded after being folded into the valve port 14. In this case, the hot melt is applied to the upper surface of the valve seat 16. Thereby, since the protrusion part 12 does not protrude from the paper bag, it does not get in the way after filling the contents, which is preferable.
Further, the protruding portion 12 protruding from the bottom surface of the paper bag may be thermocompression bonded to the side surface 17 of the paper bag. By sticking the valve seat 16 to the folding portion 21b and the side surface 17 of the paper bag in this way, it does not get in the way of being caught during handling such as transportation after filling.

  In the present embodiment, thermocompression bonding by hot melt is disclosed as a sealing means for the valve seat 16 and the folding portion 21b (valve port). However, normal glue may be injected between the valve seat 12 and one of the folded portions 21b without using hot melt and bonded.

Next, a process of manufacturing the unsealed bottom surface 13 of the paper bag 10 is shown in FIG. The unsealed bottom surface 13 is formed by a conventional method. First, the development surface 20 shown in FIG. 2 is formed from the end 10a of the paper tube folded flat, and both sides of the end of the opening 41 are mountain-folded along a second fold line b parallel to the edge, Overlay and paste (S5) Furthermore, it is configured by pasting rectangular decorative paper 42 (bottom strength paper) somewhat narrower than the bottom end to the bottom end obtained (S7). The decorative paper 42 is preferably provided with a conventionally known opening tape. Further, in order to prevent leakage of those powders, a closing paper piece 43 having a width larger than the width between the second folding lines b is disposed before folding both sides of the end of the opening 41 (S6), and thereafter the opening 41 The both sides of the end portion may be overlapped and glued, and a decorative paper 42 having an opening tape may be further adhered thereon.
Thereby, the opening side bottom face 13 can open the paper bag 10 filled with powder or the like by breaking the opening tape.
The paper bag 10 thus manufactured has a valve port side bottom surface 11 on which a valve port for filling the contents is formed, and an opening side bottom surface 13 that can be opened, and after filling the contents, The valve port can be closed.

  In FIG. 4, the manufacturing process of other embodiment of the valve side bottom face is shown. In the manufacturing process of the valve mouth side bottom surface 11 shown in FIG. 2, the valve seat 16 and the closing paper piece 25 are separately attached to the development surface, but as shown in FIG. You may use the sheet | seat 30 which served as the valve | bulb sheet | seat and the closing paper piece. This sheet 30 may be prepared by adhering the valve sheet 16 and the closing paper piece 25 of FIG. 2 together before being attached to the development surface 20, or may be integrally cut off from a paper roll. When such a sheet 30 is used, a paper bag can be manufactured by performing the S′1 step and the S′3 step of FIG. 4B instead of the S1, S2 and S3 steps of FIG. As shown in FIG. 4a, when the sheet 30 is affixed to the development surface, hot melt is applied to the portion 30a of the sheet 30 corresponding to the portion surrounded by the second fold line (the portion serving as a valve) of the one folding portion 21b. Is applied. In the step S′1 in FIG. 4B, a portion other than the rectangular portion of the second fold line b and the boundary line 26 and the second fold line of the folding portion 21b corresponding to the sheet 30 on the developing surface 20 where the upper end of the paper tube is developed. Apply glue. Thereby, the channel | path which should become the valve port 14 is securable. Also, as in step S′3, the sheet 30 is pasted so that the protruding portion 31 protrudes from the bottom surface 11 of the paper bag and covers the boundary lines 26a and 26b surrounded by the second folding line b. Thus, the valve port side bottom surface 11 having the same effect as the paper bag 10 can be formed.

Further, as shown in FIG. 5a, a different embodiment of the valve port bottom may be manufactured using the seat 35. This sheet 35 is substantially the same as the sheet 30 shown in FIG. 3 divided into left and right, and includes a first sheet 35a having a protrusion 31 and preventing leakage from one folding part 21b, and the other. It consists of the rectangular 2nd sheet | seat 35b which prevents the leakage from the folding part 21a. Hot melt is applied to the part 36a serving as a valve of the first sheet 35a, and paste is applied to the other folding part 21b corresponding to the other part. And the 1st sheet | seat 35a is affixed so that the protrusion part 31 may protrude from the bottom face of a paper bag, and so that the boundary line 26a enclosed by the 2nd folding line b may be covered. Further, paste is applied to the other corresponding cut portion 21a of the second sheet 35b, and is pasted so as not to protrude from the fold portion 21a and to cover the boundary line 26b surrounded by the second fold line b. The other structure is substantially the same as the manufacturing process of the bottom face on the valve mouth side in FIG. 2, whereby the same effect as that of the paper bag shown in FIG. 1 is obtained and the paper used for the valve seat and the closing paper piece is made. The amount can be reduced.
Here, although the integral thing was disclosed as the 1st sheet | seat 35a, it may divide | segment into a sheet | seat for valve | bulbs and a closing paper piece, and you may affix on a development surface in order. In this case, it can be manufactured by placing the valve seat on the development surface and sticking the left and right closing paper pieces on it as in step S2 of FIG.

  Further, as shown in FIG. 6a, a valve port bottom surface in another form may be manufactured using a rectangular sheet 40 that serves as both a valve sheet and a closing paper piece. In this case, hot melt is applied to the portion (shaded portion 40a) to be the valve opening 14 on the sheet 40, and the sheet 40 is pasted so that the portion protrudes from the bottom of the paper bag. Thereby, the sheet | seat 40 can be affixed like FIG. 5b.

  Until now, although the paper bag using a closing paper piece was described, the paper bag of this invention does not need to use a closing paper piece. In this case, the step S3 of FIG. 2 may be skipped, and both side edges of the development surface 20 that are the steps S2 to S4 may be folded along the second folding line b to form the valve mouth bottom surface.

FIG. 1a is a perspective view showing a paper bag of the present invention, and FIG. 1b is a partially enlarged view showing the valve opening of FIG. 1a. It is process drawing which shows the manufacture procedure of the valve mouth side bottom face of the paper bag of FIG. It is process drawing which shows the manufacture procedure of the opening side bottom face of the paper bag of FIG. FIG. 4A is a bottom view showing another form of the closing paper piece used in the paper bag of the present invention, and FIG. 4B is a process diagram of the manufacturing procedure of the valve mouth side bottom face and the valve mouth side bottom face when the closing paper piece is used. is there. FIG. 5a is a bottom view showing still another form of the closing paper piece used in the paper bag of the present invention, and FIG. 5b is a plan view when the closing paper piece is attached to the development surface. FIG. 6A is a bottom view showing still another form of the closing paper piece used in the paper bag of the present invention, and FIG. 6B is a plan view when the closing paper piece is attached to the development surface. It is process drawing which shows the manufacture procedure of the bottom face which has the valve opening of the conventional paper bag.

Explanation of symbols

a first folding line b second folding line 10 paper bag 10a end 11 valve opening side bottom surface 12 protruding part 12b protruding part 13 opening side bottom face 14 valve opening 15 filling nozzle 16 valve seat 16a one end part 16b other end part 20 development Surface 20a, 20b Side edge 20c Intersection 21a, 21b Folding portion 22 Opening portion 23 Shaded portion 25 Closing paper piece 26, 26a, 26b Boundary line 27 Bottom end portion 28 Cosmetic paper 30 Sheet 31 Protruding portion 35 Sheet 35a First sheet 35b Second sheet Sheet 36a Part serving as a valve 40 Sheet 40a Diagonal line part 41 Opening part 42 Decorative paper 43 Closing paper piece 110 Paper bag 101 Paper tube 102 Single side 103 Triangular development surface 104 Opening part 105 Edge 106 Closing paper piece 107 Valve paper 108 Bottom end part 109 Decorative paper

Claims (5)

The upper end of the flat folded paper tube is valley-folded along a first fold line parallel to the upper end to form the upper and lower surfaces of the open end,
The upper surface of the opening end is expanded so as to form a development surface having a triangular folded portion formed at both corners around the first folding line and a rectangular opening formed at the center,
Both side edges of the development surface overlap each other so that a trapezoid whose bottom edge is the side edge and the second folding line is formed on both side edges of the development surface along a pair of second folding lines parallel to the both side edges. A wrapping paper bag having a bottom surface formed by folding and bonding together,
A valve seat is provided between one of the folding portions on the development surface and both side edges of the development surface formed in a trapezoidal shape;
A trapezoidal shape formed by extending one end of the valve seat over the inner edge of the folded portion to the opening and folding the both side edges at the other end. It is placed so that it protrudes from the intersection of the sides,
A packaging paper bag provided with means for sealing between the valve seat communicating with the outside and the inside of the paper bag and one of the folded portions. The paper bag according to claim 1, wherein the means for sealing between the valve seat and the one folded portion is a thermoplastic adhesive provided between the valve seat and the one folded portion. The paper bag according to claim 1, wherein the other end portion of the valve seat protrudes from the bottom surface, and the width thereof is cut to be the same as or slightly larger than that between the second folding lines. After placing the valve seat on the development surface, a closing paper piece is pasted on the valve seat so as to cover the boundary line between the one folded portion between the second folding lines and the opening. The paper bag according to claim 1 attached. The paper bag according to claim 1, wherein the other end of the valve seat protrudes from the bottom surface, and a decorative paper having a slightly smaller area than the bottom surface is pasted on the bottom surface.