HK1146587B - Process for producing a package bag with a liquid pouring nozzle - Google Patents
Process for producing a package bag with a liquid pouring nozzle Download PDFInfo
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- HK1146587B HK1146587B HK11100730.2A HK11100730A HK1146587B HK 1146587 B HK1146587 B HK 1146587B HK 11100730 A HK11100730 A HK 11100730A HK 1146587 B HK1146587 B HK 1146587B
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Description
Technical Field
The present invention relates to an end face structure of a laminated film and an end face processing method of the laminated film, wherein the laminated film has a uniaxially or biaxially stretched base film layer and seal layers laminated at least on one surface of the base film layer or laminated on both surfaces of the base film layer with the base film layer interposed therebetween. The present invention also relates to a liquid discharge nozzle formed of a laminated film subjected to such an end surface treatment, and a method for manufacturing the same. In particular, the present invention proposes a technique for preventing an adhesive, a primer, an ink, or the like used between the base film layer and the sealant layer from coming into contact with an object to be packed in a flexible packaging bag to which a liquid discharge nozzle formed of the laminated film is attached.
Background
As a liquid discharge nozzle and a flexible packaging bag using the same, for example, japanese patent application laid-open No. 2005-59958 discloses a related product. The liquid discharge nozzle is formed by opposing inner material seal layers of a laminate film and welding peripheral portions of the laminate film except for a base end side of the discharge nozzle to each other. The laminated film is composed of a uniaxially or biaxially stretched base film layer and sealant layers laminated on both the front and back surfaces of the base film layer. In addition, an adhesive layer, a primer layer, or an ink layer for printing on the base film layer is usually provided between the base film layer and the sealant layer of the laminate film.
The packaging bag to which the liquid discharge nozzle made of the laminate film is attached is manufactured by welding the outer surface of the base end portion of the liquid discharge nozzle to the inner surface of the welded portion of the side portion or the top portion of the inner surface of the soft packaging bag main body. Therefore, the cut end surface of the liquid discharge nozzle is exposed to the inside of the packaging bag for filling the object to be packaged.
However, in the packaging bag with the liquid discharge nozzle of the related art, when the liquid discharge nozzle is welded to the packaging bag main body in a usual manner, the adhesive layer, the primer layer, and the like are exposed from the base end edge of the liquid discharge nozzle formed of the laminated film to the end face. That is, the end face of the laminated film is attached so as to be flush with the inner edge of the welded portion of the package bag body, or the end face of the laminated film is protruded inward of the inner edge, that is, toward the filling space of the object to be packed. Therefore, the object to be packed, for example, a liquid seasoning such as soy sauce, a liquid viscous material such as a beverage, or the like, filled in the soft package bag comes into contact with the proximal end edge of the liquid discharge nozzle at least at the time of discharge. In this case, the packaged article as a liquid may come into contact with the adhesive layer or primer layer exposed on the end face of the laminated film at the base end edge of the liquid discharge nozzle, or may come into contact with the ink layer.
Disclosure of Invention
Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art. The present invention provides an end face structure and a method of treating such an end face, which can completely prevent an adhesive layer, a primer layer, an ink layer, and the like from being exposed on an end face of a laminated film comprising a biaxially stretched base film layer and sealant layers laminated on or sandwiching at least one surface of the base film layer, and also provides a liquid discharge nozzle and a method of manufacturing the same. The liquid discharge nozzle can reliably prevent the contact between the object to be packed in the soft packaging bag and the adhesive layer and the like by utilizing the end surface treatment.
That is, the present invention provides an end face structure of a laminated film comprising two or more layers of a uniaxially or biaxially stretched base film layer and sealant layers laminated on or sandwiching at least one surface of the base film layer, wherein at least one of the sealant layers is fused to the base film layer by being protruded from an end edge of the base film layer, thereby covering an end face including a joint portion between the sealant layer and the base film layer.
In addition to the above, the end face structure of the laminated film comprising the uniaxially or biaxially stretched base film layer and the sealant layers laminated with the base film layer interposed therebetween is preferable, wherein the sealant layers on both sides of the base film layer are protruded from the end edge of the base film layer and welded to each other to cover the end face of the base film layer.
The present invention also provides a method for treating an end face of a laminated film comprising two or more layers, each of which is composed of a uniaxially or biaxially stretched base film layer and sealant layers laminated on or sandwiching at least one surface of the base film layer, wherein an end portion of the laminated film is sandwiched between upper and lower sides of the base film layer by a heat sealing device, and the end portion is heated and pressurized to cause the sealant layers to protrude from an end edge of the base film layer and to be welded thereto, thereby covering an end face including a joint portion between the sealant layers and the base film layer.
In addition to the above-described aspect, a method for processing an end face of a laminated film including a base film layer and sealant layers laminated with the base film layer interposed therebetween is preferable, in which an end portion of the laminated film is sandwiched vertically by a heat sealing device, and the end portion is heated and pressurized to cause the sealant layers to protrude from an end edge of the base film layer and to be welded to each other, thereby covering the end face of the base film layer.
Next, the present invention provides a liquid discharge nozzle in which a peripheral edge portion of two opposite side laminated films or one laminated film folded in two from the center is welded except for a portion to be a base end edge of the discharge nozzle, and a discharge flow path is defined inside, the laminated film including a uniaxially or biaxially stretched base film layer and seal layers laminated on or sandwiching at least one of the base film layers, wherein in the base end edge of the discharge nozzle, the seal layers of both front and back seal films, at which at least one of the base film layers is laminated, are welded to and protruded from an end edge of the base film layer, so as to cover the end face including a joint portion between the seal layers and the base film layer.
In addition to the above, it is preferable that the liquid discharge nozzle is formed by welding the peripheral edge portions of two laminated films on the front and back sides or one laminated film folded in two from the center, excluding the portion to be the base end edge of the discharge nozzle, and dividing the discharge flow path in the center portion to be the inner side, the laminated film being composed of a uniaxially or biaxially stretched base film layer and sealant layers laminated with the base film layer interposed therebetween, wherein the liquid discharge nozzle is characterized in that the liquid discharge nozzle is formed by welding the sealant layers laminated with the base film layer interposed therebetween while being protruded from the end edge of the base film layer at the base end edge of the discharge nozzle of the front and back films so as to cover the end face of the base film layer by the laminated film end face treatment method.
Further, the present invention provides a method of manufacturing a liquid discharge nozzle in which two laminated films on opposite sides or one laminated film folded in two from the center are welded at peripheral portions except for portions to be the base end edges of the discharge nozzle, and a discharge flow path is defined inside, the laminated film is composed of a uniaxially or biaxially stretched base film layer and sealant layers laminated on or sandwiching at least one surface of the base film layer, characterized in that, by the above-mentioned method for treating the end face of the laminated film, the sealant layer laminated on at least one of the base film layers is caused to overflow from the edge of the base film layer and welded thereto at the side portion to be the base end side of the discharge nozzle of the two laminated films on the front and back sides or the one laminated film folded in two from the center, then, the front and back two laminated films or the one laminated film folded in two from the center are welded to each other at peripheral edges except for a portion to be the base end edge of the discharge nozzle.
In addition to the above, it is preferable that the liquid discharge nozzle is formed by fusing the peripheral edge portions of the front and back two laminated films or the center-folded one laminated film except for the portion to be the base end edge of the discharge nozzle and defining the discharge flow path inside, the laminated film is composed of a uniaxially or biaxially stretched base film layer and sealant layers laminated with the base film layer interposed therebetween, characterized in that, by the above-mentioned method for treating the end face of a laminate film, the sealant layers laminated with the base film layer sandwiched therebetween are fused to each other while being protruded from the edge of the base film layer at the side portions to be the base end edges of the discharge nozzle of two laminate films on the front and back sides or one laminate film folded in two from the center, then, the peripheral edges of the three sides of the two front and back laminated films or the one laminated film folded in two from the center are welded to each other except for the portion to be the base end edge of the discharge nozzle.
Further, the present invention is a method for manufacturing a liquid discharge nozzle comprising welding the peripheral edge portions of two front and back side laminated films or one laminated film folded in two from the center except for the portion forming the base end edge of the discharge nozzle, and defining a discharge flow path inside, the laminated film comprising a uniaxially or biaxially stretched base film layer and each seal layer laminated on or sandwiching at least one surface of the base film layer, characterized in that the discharge nozzle film, on which a plurality of discharge nozzles having a shape and a size substantially corresponding to the liquid discharge nozzle are formed in advance, is discharged and moved with respect to a continuously moving film for a flexible packaging bag main body, the discharge nozzle being formed by welding the peripheral edge portions of the two front and back side laminated films or one laminated film folded in two from the center except for the side portion forming the base end edge of the discharge nozzle, the present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing a laminated film for a flexible packaging bag, which comprises the steps of heat-sealing base end edges of respective discharge nozzles to one side portion of an inner surface of a film for a flexible packaging bag body on one outer surface of the respective discharge nozzles, welding the discharge nozzles to the film for a flexible packaging bag body, then separating and removing unnecessary portions of the film for the discharge nozzles from the discharge nozzles, heating and pressurizing the film portions on the front surface side and the film portions on the back surface side integrally by the above-mentioned laminated film end face treatment method in a state where a mold release material is interposed between the film portions on the front surface side and the film portions on the back surface side, and at the base end edges of the discharge nozzles for the respective front and back surfaces, causing a sealing layer laminated on at least one of the base film layers to overflow from edges of the base film layers and weld.
In addition to the above-described aspects, a method for manufacturing a liquid discharge nozzle is preferable in which two opposite side laminate films or one laminate film folded in two from the center are welded at their peripheral edge portions except for the edge portions to be the base end edges of the discharge nozzle, and a discharge flow path is defined inside the liquid discharge nozzle, the laminate film including a uniaxially or biaxially stretched base film layer and sealant layers laminated with the base film layer interposed therebetween, wherein the discharge nozzle film is moved while being discharged from a continuously moving film for a flexible bag body, and a large number of discharge nozzles having shapes and sizes substantially corresponding to those of the liquid discharge nozzle are formed in advance in the discharge nozzle film, and the discharge nozzle is formed by welding the peripheral edge portions of three sides of the two opposite side laminate films or one laminate film folded in two from the center except for the edge portions to be the base end edges of the discharge nozzle, the base end edge of each discharge nozzle is heat-sealed to one side portion of the inner surface of the film for the main body of the flexible packaging bag on one outer surface of each discharge nozzle, the discharge nozzle is welded to the film for the main body of the flexible packaging bag, thereafter, the unnecessary portion of the film for the discharge nozzle is cut and removed from the discharge nozzle, and the film portion on the front surface side and the film portion on the reverse surface side are integrally heated and pressurized by the above-mentioned laminate film end face processing method in a state where a mold release material is interposed between the film portions on the front surface side and the film portions on the reverse surface side of each discharge nozzle, and the seal layers laminated with the base film layer interposed therebetween are welded to each other in a state of being protruded from the edge of the base film layer at the base end edge of the discharge nozzle of each of the front and reverse films to cover the end face of the base film layer.
Further, the present invention provides a method of manufacturing a liquid discharge nozzle comprising welding the peripheral edge portions of two front and back side laminated films or one laminated film folded in two from the center except for the side portions to be the base end edges of the discharge nozzle, and defining a discharge flow path inside, the laminated film comprising a uniaxially or biaxially stretched base film layer and sealant layers laminated on or sandwiching at least one of the base film layers, characterized in that the base end edge of the discharge nozzle having a shape and a size substantially corresponding to the liquid discharge nozzle and formed by welding the peripheral edge portions of the two front and back side laminated films or one laminated film folded in two from the center except for the side portions to be the base end edges of the discharge nozzle is positioned in a region corresponding to the welded portion of the side portion or the top portion of the soft packaging bag main body, and in a state that a mold release material is interposed between the front and back film portions of the discharge nozzle, the film for the flexible package bag main body is heated and pressurized from the outer surface side thereof by a heat sealing device, so that the outer surface of the discharge nozzle is welded to the inner surface of the package bag main body within the welding range of the formed flexible package bag main body, and the sealing layer laminated on at least the front surface of the base film layer is caused to overflow from the end edge of the base film layer and welded thereto to cover the end surface of the base film layer at the base end edge of the discharge nozzle of each of the front and back films by the above-mentioned laminated film end surface treatment method.
In addition to the above-described aspects, it is preferable that the method of manufacturing a liquid discharge nozzle includes welding the peripheral edge portions of two opposite side laminated films or one laminated film folded in two from the center, excluding the side portions to be the base end edges of the discharge nozzle, and defining a discharge flow path inside the liquid discharge nozzle, the laminated films including a uniaxially or biaxially stretched base film layer and sealant layers laminated with the base film layer interposed therebetween, wherein the base end edge of the discharge nozzle having a shape and a size substantially corresponding to the liquid discharge nozzle, which is formed by welding the peripheral edge portions of the two opposite side laminated films or the one laminated film folded in two from the center, excluding the side portions to be the base end edges of the discharge nozzle, is positioned in a region corresponding to the welded portion of the side portion or the top portion of the soft packaging bag main body, and a mold release material is interposed between the opposite side film portions of the discharge nozzle, the film for the flexible package bag main body is heated and pressurized from the outer surface side thereof by a heat sealing device, so that the outer surface of the discharge nozzle is welded to the inner surface of the package bag main body within the welding range of the formed flexible package bag main body, and the sealing layers laminated with the base film layer interposed therebetween are caused to overflow from the end edge of the base film layer and welded to each other at the base end edges of the discharge nozzles of the front and back films by the above-mentioned laminated film end face treatment method, thereby covering the end face of the base film layer.
In the present invention, the adhesive layer, the primer layer, and the like on the entire end surface including the joint portion of the laminated film can be prevented from being exposed by causing the sealant layers on the front side or both the front and back sides laminated on at least one of the surfaces of the base film layer at the base end edge of the discharge nozzle by the action of the adhesive layer, the primer layer, and the like on the uniaxially or biaxially stretched base film layer to protrude from the base film layer and weld.
The following description is given assuming a three-layer structure in which the sealing layer is disposed on both surfaces of the base film layer, and this can achieve exactly the same effect as in the case where two layers of the sealing layer are provided only on one surface of the base film layer, or in the case of a multilayer of three or more layers.
In particular, in the present invention, the end face treatment of the laminate film is used for the treatment of the base end edge of the liquid discharge nozzle, and the sealant layers laminated on both the front and back surfaces sandwiching the base film layer are welded to each other in a state of being protruded from the edge of the base film layer, so that the possibility of the contact of the adhesive layer, the primer layer, and the like of the liquid discharge nozzle, which are welded integrally with the soft package bag main body to become a part of the soft package bag, with the bag package can be reliably prevented regardless of when the welding is performed, and therefore, sufficient safety, sanitation, and the like can be always ensured even if the bag package is a beverage or a food.
Here, when the base end portion of the liquid discharge nozzle is welded to the packaging bag main body in a state of protruding into the packaging object accommodating space of the packaging bag main body, it is preferable that not only the seal layers of the base end edge of the discharge nozzle but also the seal layers laminated via the base film layer in the entirety of the protruding portion are welded to each other similarly to the seal layers of the base end edge.
When the end face treatment of the laminate film of the present invention is performed, for example, when a desired treatment is performed in advance on two laminate films on the front and back sides or one laminate film folded in two from the central portion itself at the time of manufacturing the liquid discharge nozzle, the adhesive layer of the liquid discharge nozzle can be reliably prevented from being exposed to the outside by completely covering the adhesive layer, the primer layer, and the like with the two sealant layers by welding the adhesive layer, the primer layer, and the like in the side portion of the film which will be the base end edge of the liquid discharge nozzle later in a state of being protruded from the edge of the base film layer by using, for example, a heat seal plate, a heat seal roller, or the like subjected to a mold release treatment with silicone, polytetrafluoroethylene, or the like, and then the desired liquid discharge nozzle is formed by welding, and when the manufactured liquid discharge nozzle is joined to the packaging bag main body to form a soft packaging bag, the adhesive layer of the liquid discharge nozzle can be reliably prevented from being exposed to the adhesive layer of, The base layer, etc. may come into contact with the contents of the bag.
In this connection, as described above, the discharge nozzle film in which a large number of discharge nozzles having shapes and sizes corresponding to the liquid discharge nozzles are formed in advance is discharged and moved with respect to the continuously moving film for the flexible package bag body, the base end portion of each discharge nozzle is heat-sealed to one side portion of the inner surface of the film for the flexible package bag body on one outer surface of the film for one side constituted by the seal layer having a lower melting point than the seal layer on the inner surface of the discharge nozzle, the discharge nozzle is welded to the film for the package bag body, thereafter, the unnecessary portion of the discharge nozzle film is cut and removed from the one-way discharge nozzle, and the film portion on the front surface side and the film portion on the reverse surface side of each discharge nozzle are heated and pressurized integrally by, for example, the heat sealing device, with the mold release material interposed between the film portions on the front surface side and the film portion on the reverse surface side of each discharge nozzle, the same applies to the case of manufacturing a liquid discharge nozzle by welding the sealing layers laminated on the base film layer between the front and back film portions in a state of protruding from the edge of the base film layer at the base end side of the nozzle.
In this case, when the film for the bag body in the filling and packaging machine is sequentially fed and moved to automatically fill and package the object to be packaged, the discharge nozzle manufactured in advance is attached to the bag body to form a predetermined liquid discharge nozzle, so that the liquid discharge nozzle can be manufactured more efficiently than in the case where the sealing layers are welded to each other with the base film layer interposed therebetween in a separate independent process.
In this regard, as described above, the base end edge of the spout having a shape and a size corresponding to the liquid spout is positioned in the region corresponding to the welded portion of the side portion or the top portion of the flexible package bag main body, and the film for the package bag main body is heated and pressurized from the outer surface side thereof by the heat sealing device in a state where the mold release material is interposed between the front and back film portions of the spout, so that the outer surface of the spout is welded to the inner surface of the package bag main body while ensuring the discharge flow path within the range of the welded portion of the formed flexible package bag main body. The same applies to the case where the liquid discharge nozzle is constructed by welding the sealing layers laminated on the front and back film portions with the base film layer interposed therebetween in a state of protruding from the edge of the base film layer at the base end side of the discharge nozzle.
Drawings
Fig. 1 is a view showing an embodiment of a liquid discharge nozzle of the present invention.
Fig. 2 is a sectional view illustrating a manufacturing process of the liquid discharge nozzle.
Fig. 3 is a schematic perspective view illustrating a main part of a method of manufacturing the liquid discharge nozzle.
Fig. 4 is a cross-sectional view illustrating a next step of the content shown in fig. 3.
Fig. 5 is a sectional view illustrating another manufacturing process of the liquid discharge nozzle.
Fig. 6 is a photograph showing a cross section of the liquid discharge nozzle welded to the soft packaging bag main body according to the process of fig. 5.
Detailed Description
Hereinafter, an embodiment of the present invention will be described by taking as an example a liquid discharge nozzle formed by using a laminated film having a three-layer structure in which sealing layers are disposed on both surfaces of a base film layer.
Fig. 1 is a view showing an embodiment of a liquid discharge nozzle of the present invention, and fig. 1(b) is an enlarged sectional view taken along line b-b of a side view of the discharge nozzle shown in fig. 1 (a).
The part indicated by oblique lines in the drawing shows a welded part 1 provided at the peripheral edge part except for the part to be the base end edge of the discharge nozzle of the two laminated films on the front and back sides or the one laminated film folded in two from the central part, and the welded part 1 can form a discharge port at the tip of a discharge flow path 3 formed inside the welded part 1 by breaking or cutting the tip welded part 2.
The base end of the liquid discharge nozzle 4 is welded to, for example, the side of the upper end of the soft packaging bag main body 5 shown by a two-dot chain line in fig. 1(a), and constitutes a part of the soft packaging bag 13.
As shown in fig. 1(b), the film portion 6 on the front surface side of the liquid discharge nozzle 4 is composed of a uniaxially or biaxially stretched base film layer 8 and seal layers 10a and 10b, and the film portion 7 on the reverse surface side is composed of a uniaxially or biaxially stretched base film layer 9 and seal layers 11a and 11b, and the seal layers 10a, 10b and 11a and 11b sandwich the base film layers 8 and 9, and are laminated on both surfaces of the base film layers 8 and 9 via adhesive layers 10 and 11 having a thickness of about 3 to 8 μm, or a primer layer having a thickness of about 0.1 to 0.5 μm, or via a print layer provided on one surface of the base film layers 8 and 9 in some cases. And the liquid discharge nozzle 4 itself is constituted by: in the proximal end edge 4a portion of the liquid discharge nozzle 4, the sealant layers 10a, 10b and 11a, 11b laminated on the base film layers 8, 9 of the front and back film portions 6, 7 with the base film layers 8, 9 interposed therebetween are welded to each other in a state of being protruded from the edge positions of the base film layers 8, 9 indicated by the chain lines in the figure, and the adhesive layers 10, 11 and the like are completely covered with the sealant layers 10a, 10b and 11a, 11 b.
Reference numeral 12 in the figure denotes a liquid flow cutting protrusion formed at a welded portion on the lower side of the liquid discharge nozzle 4. The projection is used for preventing the packaged material from flowing down to the packaging bag main body 5 side by flowing to the welded portion 1 of the liquid discharge nozzle 4 when the packaging bag 13 is re-erected after the liquid as the packaged material is discharged from the soft packaging bag 13.
In the liquid discharge nozzle 4 thus configured, in the state of being welded to the packaging bag main body 5 as shown in fig. 1(a), any one of the adhesive layers 10, 11 and the like of the front and back film portions 6, 7 is covered with the seal layers 10a, 10b and 11a, 11b at the base end edge 4a of the liquid discharge nozzle 4, so even if the base end edge 4a of the liquid discharge nozzle 4 comes into contact with the packaged object in the soft packaging bag 13 in the state of being welded to the packaging bag main body 5, the seal layers 10a, 10b and 11a, 11b can sufficiently prevent the adhesive layers 10, 11 and the like from coming into contact with the liquid or the like as the packaged object in the bag, regardless of the posture of the soft packaging bag 13 being erected or the inclined posture of pouring the liquid or the like.
Here, when the liquid discharge nozzle 4 is joined to the packaging bag main body 5 in a posture in which a part of the base end portion thereof slightly protrudes into the space for storing the object in the packaging bag main body 5, it is preferable to have the following configuration: not only the base end edge 4a of the liquid discharge nozzle 4 but also the sealing layers 10a, 10b, 11a, and 11b laminated with the base film layers 8 and 9 interposed therebetween are welded together in a state of protruding from the base film layers 8 and 9 in the portions of the welded portion 1 adjacent to the base end edge 4a and protruding into the package-receiving space, and the adhesive layers 10 and 11 and the like are covered with the sealing layers 10a, 10b, 11a, and 11b, whereby the contact of the package-receiving material in the bag with the adhesive layers 10 and 11 and the like can be prevented more sufficiently.
FIG. 2 is a cross-sectional view showing an example of a step to be performed on the front and back film portions 6, 7 for manufacturing the liquid discharge nozzle 4 as described above, in which the side portions to be the base end side 4a later of each of the front and back two laminated films or the side portions to be the base end side 4a later of the liquid discharge nozzle 4 later of each of the one laminated film folded in two from the center are shown, and in the drawing, the side portions to be the base end side 4a later of one of the film portions 6, 7 are formed by a pair of heat seal plates 21 subjected to a mold release treatment, for example, with silicone, polytetrafluoroethylene or the like, and in the drawing, the seal layers 10a, 10b and 11a, 11b are heated and pressurized from the upper and lower directions to melt and flow together the seal layers 10a, 10b and 11a, 11b laminated with the base film layers 8, 9 interposed therebetween, and the seal layers 10a, 10b and 11a, 11b are melted and flowed together from the base film layers 8, 8, The layer edges 8a and 9a of the front and back film portions 9 are welded to each other in a state of being protruded, and the welded portion 14 formed in this way completely covers the adhesive layers 10 and 11 exposed from the end faces of the front and back film portions 6 and 7.
Although the case where the fusion-bonded portions 14 covering the adhesive layers 10, 11 and the like are formed by the pair of heat seal plates 21 has been described above, the same fusion-bonded portions 14 may be formed by using a pair of heat seal rollers 22 subjected to the same mold release treatment instead of the heat seal plates 21 as shown by the two-dot chain lines in the drawing, sandwiching the edge portions of the film portions 6, 7 by the heat seal rollers 22, and heating and pressing the seal layers 10a, 10b and 11a, 11b by the relative movement of the heat seal rollers 22 in the direction perpendicular to the paper surface along the edge portions of the heat seal rollers 22. In this way, there is an advantage that the desired welded portion 14 can be formed continuously and at high speed as compared with the case of using the heat seal plate 21.
In this way, after the welded portion 14 covering the adhesive layers 10 and 11 and the like is formed, the front and back film portions 6 and 7 each composed of two laminated films on the front and back sides or one laminated film folded in two from the center are welded at the peripheral edge portions other than the edge 14a of the welded portion 14 which becomes the base end edge 4a of the liquid discharge nozzle 4 by the heat sealing device as described above, and the seal layers 10b and 11b at the positions facing each other are welded, thereby constituting the liquid discharge nozzle 4 in which the desired discharge flow path 3 is defined on the inner side.
Fig. 3 is a schematic perspective view illustrating a main part of another manufacturing method of the liquid discharge nozzle 4, which shows: the spout film 16 is continuously fed and moved at a predetermined speed with respect to a film 23 for a flexible package bag body continuously moving at a constant speed, wherein a large number of spouts 15 having a shape and a size substantially corresponding to the liquid spout 4 are formed in advance in the spout film 16, and the spouts 15 are formed by welding mutually opposing seal layers 10b, 11b of the front side film portion 6 and the back side film portion 7 of the front and back side two laminated films or one laminated film folded in two from the center, respectively, at peripheral portions other than a side portion to be a base end edge 4a of the spout by a suitable heat sealing device or the like. The time taken for each discharge nozzle 15 to reach the press roller 25 located opposite the heat roller 24 is calculated, the press rollers 25 are advanced and displaced relative to the heat roller 24, the base end side of the discharge nozzle 15 is heat-sealed to the seal layer on the inner surface of the film 23 at one side portion of the film 23 for the flexible bag body by, for example, the seal layer 11a on the outer surface of the film portion 7 on the reverse side in a state where both films 16, 23 are moving at the same speed, the discharge nozzle 15 is welded to the film 23 for the bag body, and then the unnecessary portion of the discharge nozzle film 16 is cut and removed along the easy tear mark formed on the periphery of the discharge nozzle 15 by the separation film 26.
In this connection, for example, after separating and removing the unnecessary part of the spout film 16 from the spout 15 welded to the film 23 for the flexible package bag body, in the case where a mold release material 27 such as silicone rubber or polytetrafluoroethylene is interposed between the film portion 6 on the front surface side and the film portion 7 on the back surface side of the spout 15 as illustrated in an enlarged cross-sectional view in fig. 4, the film portion 6 on the front surface side and the film portion 7 on the back surface side of the spout 15 including the film 23 for the flexible package bag body are rapidly and integrally heated and pressurized by a heat seal device such as a heat seal plate 21 and a heat seal roller 22, and as illustrated in fig. 4(b), the seal layers 10a, 10b and 11a, 11b laminated with the base film layers 8, 9 of the front and back film portions 6, 7 sandwiched therebetween are welded to each other in a state of being overflowed from the base film layer end edges 8a, 9a at the base end edge 15a of the spout 15, the pressure-sensitive adhesive layers 10 and 11 and the like are completely covered with the welded portion 14, thereby forming a predetermined liquid discharge nozzle 4.
In the liquid discharge nozzle 4 thus manufactured, the film 23 for the main body of the flexible packaging bag is folded in two at the center in the width direction in a state where the mold release material 27 is pulled out, the inner surface seal layer of the other side portion thereof is welded to the outer surface seal layer 10a of the film portion 6 on the front surface side of the manufactured liquid discharge nozzle 4, which is relatively low in melting point, and the welded portion constituting the bottom or top of the packaging bag is formed on the film 23 itself for the main body of the packaging bag, whereby the desired flexible packaging bag 13 can be manufactured.
Fig. 5 is a side view illustrating another manufacturing process of the liquid discharge nozzle, in which the base end edge 15a of the discharge nozzle 15 is positioned at the welded portion of the side portion or the top portion of the soft bag main body 17 in the range corresponding to the welded portion 17a shown by the two-dot chain line at the upper end portion of the side portion, and the release material 27 is interposed between the front and back film portions 6 and 7 of the discharge nozzle 15 as described above, regardless of whether the front and back film portions 6 and 7 composed of two front and back laminated films or one laminated film folded in two from the center are welded to the peripheral edge portions other than the side portion which becomes the base end edge 4a of the liquid discharge nozzle 4 as described above and the discharge nozzle 15 having a shape and a size substantially corresponding to the liquid discharge nozzle 4 is welded to the inner surface of one side portion of the soft bag main body film 23 as described above with reference to fig. 3, the flexible package bag main body film 23 sandwiching the discharge nozzle 15 is heated and pressurized from the outer surface side of the package bag main body film 23 by a heat sealing device not shown, whereby the seal layers 10a, 11a on the outer surface of the discharge nozzle 15 are welded to the seal layer on the inner surface of the package bag main body 17 in the formed welded part 17a of the flexible package bag main body 17, and the seal layers 10a, 10b and 11a, 11b laminated with the base film layers 8, 9 on the front and back film portions 6, 7 are fused to each other in a state of protruding from the base film layer edges 8a, 9a on the base end edge 15a of the discharge nozzle 15, as described in connection with fig. 1, 2 and 4, thereby forming the welded part 14 completely covering the adhesive layers 10, 11 and the like. This enables the manufacture of the liquid discharge nozzle 4 to be completed simultaneously with the manufacture of the soft packaging bag 13.
As shown in the cross-sectional photograph of fig. 6, the liquid discharge nozzle 4 manufactured in this manner is completely covered with the sealing layers 10a, 10b, 11a, 11b, and the like, and therefore, even if the inner package of the soft packaging bag 13 comes into contact with the base end edge 4a of the liquid discharge nozzle 4, the contact between the adhesive layers 10, 11, and the like and the inner package of the bag is reliably prevented by the welding portion 14, and therefore, sufficient safety and hygiene can be always ensured.
The end face treatment structure and the end face treatment method of the laminated film of the present invention can be widely used in fields where high safety and sanitation are required. The liquid discharge nozzle using the end surface treatment and the method for manufacturing the same can be effectively used for a soft packaging bag for liquid or viscous drinks including powder and particles, food, cosmetics, pharmaceuticals, etc., such as soy sauce, various seasonings, soup, fruit juice, or a packaging bag heated at a high temperature, such as sterilized packaged food.
Claims (2)
1. A method for manufacturing a packaging bag with a liquid discharge nozzle used for a packaging bag for foods, drinks, cosmetics, or pharmaceuticals, the liquid discharge nozzle being formed by welding a peripheral edge portion of two laminated films on front and back sides or one laminated film folded in two from the center, excluding a portion to be a base end edge of the discharge nozzle, and defining a discharge flow path in a central portion to be an inner side of the peripheral edge portion, the laminated films being composed of a uniaxially or biaxially stretched base film layer and sealant layers laminated with the base film layer interposed therebetween, and the base end edge of the discharge nozzle being welded to a packaging bag main body in a state of protruding into a packaging object storage space of the packaging bag main body, the method comprising:
a first step of feeding and moving a spout film, on which a plurality of spouts having shapes and sizes substantially corresponding to those of the liquid spouts are formed, with respect to a continuously moving film for a flexible package bag main body;
a second step of heat-sealing a base end portion of each discharge nozzle to one side portion of an inner surface of the film for the main body of the flexible package bag on one outer surface of each discharge nozzle, and welding the discharge nozzle to the film for the main body of the flexible package bag;
a third step of cutting off and removing a useless portion of the nozzle film from the nozzle; and
and a fourth step of heating and pressurizing the front-side film portion and the back-side film portion integrally by sandwiching the front-side film portion and the back-side film portion between both film portions of the front-side film portion and the back-side film portion of each discharge nozzle with a release material interposed therebetween, thereby welding the sealant layers sandwiched therebetween to each other in a state of protruding from an edge of the base film layer to cover an end face of the base film layer at a base end edge of the discharge nozzle protruding into the main body of the package bag and contacting the material to be packaged, of the front-side and back-side laminate films constituting the discharge nozzle.
2. A method for manufacturing a packaging bag with a liquid discharge nozzle used for a packaging bag for foods, drinks, cosmetics, or pharmaceuticals, the liquid discharge nozzle being formed by welding two front and back laminated films or one laminated film folded in two from the center, the laminated film being composed of a uniaxially or biaxially stretched base film layer and sealant layers laminated thereon with the base film layer interposed therebetween, the base end edge of the discharge nozzle being welded to a packaging bag main body in a state of protruding into a packaging object accommodating space of the packaging bag main body, the peripheral edge of the laminated film except for a side portion to be a base end edge of the discharge nozzle, and a discharge flow path being defined inside the peripheral edge portion, the method comprising:
a first step of positioning a base end edge of a discharge nozzle having a shape and a size substantially corresponding to the liquid discharge nozzle in a region corresponding to a weld at a side portion or a top portion of a soft packaging bag main body;
a second step of sandwiching the film for the flexible package bag main body from the outer surface side thereof with a mold release material interposed between the film portions of the discharge nozzle on the front and back sides thereof, and heating and pressurizing the film for the flexible package bag main body by using a heat sealing device, thereby welding the outer surface of the discharge nozzle to the inner surface of the package bag main body within the range of welding the formed flexible package bag main body; and
and a third step of, in front and back laminated films constituting the discharge nozzle, projecting to a base end edge of the discharge nozzle in the main body of the packaging bag, which is in contact with the packaged food or drink material, and covering an end face of the base film layer by causing the sealant layers laminated with the base film layer interposed therebetween to project from an end edge of the base film layer and to be welded to each other.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007309749A JP4545187B2 (en) | 2007-11-30 | 2007-11-30 | Method for producing liquid dispensing nozzle for food and beverage packaging bag |
| JP2007-309749 | 2007-11-30 | ||
| PCT/JP2008/070964 WO2009069514A1 (en) | 2007-11-30 | 2008-11-12 | Edge face structure of laminated film, method of processing edge face, liquid ejection nozzle with processed edge face, and process for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| HK1146587A1 HK1146587A1 (en) | 2011-06-24 |
| HK1146587B true HK1146587B (en) | 2013-11-08 |
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