JP2004196324A - Zipper, bag with zipper, and manufacture method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a zipper, a bag with the zipper, and a manufacturing method for the same, which improve the manufacturing efficiency of the bag without interposing a heat resistant member between zipper tapes upon fitting the zipper to the bag. <P>SOLUTION: The zipper comprises the heat-weldable first zipper tape 1 having a zipping part 3 formed longitudinally, and the heat-weldable second zipper tape 2 having a zipped part 4 engaged with the zipping part 3 longitudinally. On the counter surfaces of the first zipper tape 1 and the second zipper tape 2, heat resistant layers 5, 6 are formed, respectively, where the heat resistant layers 5, 6 are heat resistant coating agents applied to the first and second zipper tapes, respectively. On the bag with the zipper, the first zipper tape 1 is welded to the interior surface of the opening of a bag body, while the second zipper tape 2 is heat welded to the position that is counter to the first zipper tape 1 at the interior of the opening. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chuck, a bag with a chuck, and a manufacturing method.
[0002]
[Prior art]
The chuck is provided, for example, at the opening of the gusseted bag, and can open and close the opening of the bag.
[0003]
This type of chuck includes a heat-sealable first chuck tape having a chuck portion along a longitudinal direction, and a heat-sealable second chuck tape having a chucked portion meshed with the chuck portion along a longitudinal direction. The chuck portion and the chucked portion are detachably engaged with each other to be connected.
[0004]
[Patent Document]
Japanese Patent Application No. 2001-355684
[0005]
[Problems to be solved by the invention]
When attaching the chuck to the bag, a first method and a second method are conceivable. In the first method, a first zipper tape is heat-welded to one side of the inner surface of the bag opening, and a second zipper tape is heat-welded to a position on the inner surface of the bag opening facing the first zipper tape. Is what you do.
[0006]
In the second method, for example, as shown in FIG. 11, a chuck is interposed between two bag forming sheets 203 and 204 in a state where the chuck portion 200 and the chucked portion 201 are engaged with each other, and a first chuck tape 205 is provided. A heat-resistant member 207 is interposed between the second chuck tape 206 and the second chuck tape 206, avoiding the chuck portion 200 and the chucked portion 201. By holding the second zipper tape 204 and heating at the same time, the zipper tapes 203 and 204 are simultaneously thermally welded to the bag forming sheets 203 and 204. The heat-resistant member 207 is for preventing the first chuck tape 203 and the second chuck tape 204 from being thermally welded to each other.
[0007]
In the second method, since each chuck tape can be thermally welded to the bag forming sheet at a time, the bag manufacturing efficiency is higher than in the first method.
[0008]
However, in the second method, it is necessary to interpose a heat-resistant member between the zipper tape of the bag and the second zipper tape, so that the efficiency of bag production is low, and the heat-resistant member is inserted between the bag forming sheets. Is not easy, and it takes time to adjust.
[0009]
Accordingly, an object of the present invention is to provide a chuck, a bag with a chuck, and a manufacturing method capable of eliminating the need for interposing a heat-resistant member between the chuck tapes at the time of attaching the chuck and improving the manufacturing efficiency of the bag.
[0010]
[Means for Solving the Problems]
The chuck according to claim 1, wherein the heat-sealable first chuck tape having a chuck portion along the longitudinal direction, and the heat-sealable second chuck having a chucked portion meshed with the chuck portion along the longitudinal direction. And a heat-resistant layer formed on the opposing surfaces of the first and second chuck tapes.
[0011]
According to the chuck of the first aspect, the chuck in which the chucked portion and the chuck portion are engaged is interposed between the two sheets, and the sheet and the chuck are heated by sandwiching the outer surface of each sheet with a hot plate. Although the tapes can be heat welded, the chuck tapes do not heat weld because of the heat-resistant layer. Therefore, unlike the conventional case, there is no need to interpose a heat-resistant member at the time of attaching the chuck, so that the bag can be easily manufactured and the manufacturing efficiency can be improved.
[0012]
According to a second aspect of the present invention, in the first aspect, the heat resistant layer is a heat resistant coating agent applied to the first chuck tape and the second chuck tape.
[0013]
According to the chuck of the second aspect, in addition to the same effect as the first aspect, the heat-resistant coating agent can be continuously applied along the long tape by using the application roller. Manufacturing becomes easy.
[0014]
In the bag with a zipper according to a third aspect, the first zipper tape of the zipper according to the first or second aspect is heat-welded to the inner surface of the opening of the bag body, and the second zipper tape is attached to the inner surface of the opening. Is thermally welded to a position facing the first chuck tape.
[0015]
According to the bag with the zipper according to the third aspect, the same effect as that of the first aspect is obtained.
[0016]
In a bag with a zipper according to a fourth aspect, in the third aspect, the bag body has a side seal portion in which side portions of two bag forming sheets are heat-welded to each other, and the first zipper tape and the first zipper tape are provided. The end portion of the zipper tape 2 is crushed and welded between the bag forming sheets at the side seal portion.
[0017]
According to the bag with the zipper according to the fourth aspect, in addition to the same effect as the third aspect, the first zipper tape and the second zipper tape are thermally welded to each other by crushing the zipper and crushing the heat-resistant layer. As a result, the side seal portion can be completely sealed, air leakage can be prevented, and workability is extremely simple.
[0018]
In a bag with a zipper according to a fifth aspect, in the fourth aspect, the bag body has a gusset on a side portion.
[0019]
According to the bag with the zipper according to the fifth aspect, the same effect as that of the fourth aspect is obtained.
[0020]
According to a sixth aspect of the present invention, there is provided a method of manufacturing a chuck, comprising the steps of: preparing each chuck tape of the chuck according to the second embodiment; and applying a pressure roller to the chuck tape and an application roller to which a heat-resistant coating agent is supplied alongside the pressure roller. And applying a heat-resistant coating agent to the surface of the chuck tape by drying the chuck tape, drying the chuck tape, and winding the chuck tape around a winding drum.
[0021]
According to the chuck manufacturing method of the sixth aspect, the same effect as that of the third aspect is obtained.
[0022]
According to a seventh aspect of the present invention, there is provided the bag manufacturing method, wherein the chuck forms the opening of the bag of the two bag forming sheets in a state where the chuck portion and the chucked portion of the chuck according to the first or second aspect are engaged. A step of interposing between the parts to be performed, and sandwiching and heating the chuck with a hot plate from the outside of the bag forming sheet so that the heat-resistant layers of the first chuck tape and the second chuck tape of the chuck come into contact with each other. Heat-welding the first zipper tape and the second zipper tape to the bag forming sheet.
[0023]
According to the bag manufacturing method of the seventh aspect, the same effect as that of the first aspect is obtained.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
A chuck according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a cross-sectional view of the chuck. This chuck has a first chuck tape 1 and a second chuck tape 2. The first zipper tape 1 is formed of a material that can be welded, and has a zipper portion 3 along the longitudinal direction. The chuck portion 3 of the embodiment is a male chuck having a ridge shape, and the first chuck tape 1 serves as a base portion of the male chuck.
[0025]
The second zipper tape 2 is formed of the same material as the first zipper tape 1 which can be thermally welded, and has a chucked portion 4 which is detachably engaged with the chuck portion 3 along the longitudinal direction. The chucked portion of the embodiment is a female chuck having a concave shape, and the second chuck tape 2 is a base portion of the female chuck.
[0026]
Heat resistant layers 5 and 6 are formed on the opposing surfaces of the first chuck tape 1 and the second chuck tape 2. The heat resistant layers 5 and 6 are heat resistant coating agents applied to the first zipper tape 1 and the second zipper tape 2.
[0027]
2 to 4 show process diagrams of a method for manufacturing a chuck. The first step is to prepare the chuck tapes 1 and 2 of the chuck. As shown in FIG. 2, a first chuck tape 1 having a chuck portion 3 is continuously extruded from a die 9 of an extruder 8 using, for example, linear low-density polyethylene as a material. The tape 1 is rotated by a guide roller 11 in a water tank 10 to be water-cooled, guided to a guide roller 12 outside the water tank 10, and water droplets on the first chuck tape 1 are removed by air 13. The same applies to the second zipper tape 2, which is extruded with a die for the second zipper tape.
[0028]
In the second step, the chuck tape 1 (2) manufactured in the first step is passed between the pressure roller 8 and the application roller 9 to which the heat-resistant coating agent 5a is supplied alongside the pressure roller 8. The heat-resistant coating agent 5a is applied to the surface of the chuck tape 1 (2). In FIG. 2, the chuck tape 1 (2) after water droplets are removed by the air 13 is supplied between the pressure roller 8 and the application roller 9 via the guide rollers 14 to 16. As shown in FIGS. 3 and 4, the pressure roller 8 uses, for example, a pressure drum roller, the application roller 9 uses a groove cutting roller, and is in contact with the pressure roller 8 and the mesh roller 17. A part is immersed in the container 20 containing the liquid of the coating agent 5a. When the mesh roller 17 rotates, the heat-resistant coating agent 5 a adheres to the surface mesh and adheres to the peripheral surface of the mesh roller 17, but is regulated by the doctor blade 21 so that a fixed amount adheres. Since the surface of the application roller 9 contacts the mesh roller 17, the heat-resistant coating agent 5a adheres to the surface of the application roller 9, but does not adhere to the groove. The first chuck tape 1 or the second chuck tape 2 passes between the pressure roller 8 and the application roller 9 such that the chucked portion 4 or the chuck portion 3 is located in the groove of the application roller 9. As a result, the heat-resistant coating agent 5 a is applied to the surface of the chuck tape 1 (2), but is not applied to the chuck portion 3 or the chucked portion 4. As the heat-resistant coating agent 5a, for example, a material containing polyamide and nitrified cotton that does not melt at 150 ° C., for example, a “Safel release coating agent” manufactured by T & K TOKA Corporation is used. The processing speed of the chuck tape 1 (2) is, for example, 30 m / min, the concentration of the coating liquid is 3% by weight, the wet coating amount is 0.5 g / m ² , and the solid coating amount (in a state where the solvent is evaporated) is 0.015 g. / M ³ .
[0029]
The third step is a step of drying the chuck tape 1 (2). The chuck tape 1 (2) to which the heat-resistant coating agent 5a has been applied is supplied to the dryer 22 via the guide roller 16, the coating liquid is dried, and the heat-resistant coating agent 5a remains. The drying temperature is, for example, 65 ° C. in hot air drying.
[0030]
The fourth step is a step of winding the chuck tape 1 (2) around the winding drum 23 via the guide rollers 24-26.
[0031]
FIG. 5 shows an attached state of a part of the chuck of the bag with the chuck. The first zipper tape 1 of the zipper is heat-welded to the inner surface of the opening of the bag body 30 composed of the two bag forming sheets 31 and 32, and the second zipper tape 2 is attached to the first zipper tape on the inner surface of the opening. 1 is heat-welded to the position opposite to 1.
[0032]
FIG. 6 shows a method of attaching a chuck in the method of manufacturing a bag with a chuck. In the first step, the chuck is interposed between the portions forming the openings of the bag body 30 of the two bag forming sheets 31 and 32 in a state where the chuck portion 3 and the chucked portion 4 of the chuck are engaged.
[0033]
In the second step, a hot plate having a substantially U-shaped cross section from the outside of the bag forming sheets 31 and 32 so that the heat-resistant layers 5 and 6 of the first zipper tape 1 and the second zipper tape 2 of the zipper abut against each other. The first and second zipper tapes 1 and 2 are thermally welded to the bag forming sheets 31 and 32 by sandwiching and heating the zippers at 35 and 36. When the melting points of the bag forming sheets 31 and 32 and the chuck tapes 1 and 2 are set to, for example, less than 150 ° C. and the melting points of the heat-resistant layers 5 and 6 are set to 150 ° C. or more, the heating plates 35 and 36 heat the heat-resistant layers 5 and 6 to each other. Without the heat welding, the bag forming sheets 31 and 32 and the chuck tapes 1 and 2 can be heat welded. In this case, in the embodiment, the welding is performed at a processing speed of 65 shots / minute and a hot plate temperature of 160 ° C. Note that the chuck portion 3 and the chucked portion 4 are located in the concave portions of the hot plates 35 and 36 and are not pressed and heated like a chuck tape, so that they are not mutually welded.
[0034]
Here, as shown in FIG. 7, before the first step, the second zipper tape 2 is formed wider than the first zipper tape 1, and the chuck portion 3 and the chucked portion 4 are engaged with each other. The portion 2a protruding from the overlapping position of the first zipper tape 1 and the second zipper tape 2 by a wide width is heat-welded to the bag forming sheet 32 first. In this way, when the process shifts to the first step, there is no need to separately interpose a chuck between the two bag forming sheets 31 and 32.
[0035]
Further, when the bag body 30 has a side seal portion in which the side portions of the two bag forming sheets 31 and 32 are heat-sealed to each other, the end portions of the first chuck tape 1 and the second chuck tape 2 Is crushed and welded between the bag forming sheets 31 and 32 at the side seal portion. In this case, as a condition for the layer of the heat-resistant coating agent 5a to be crushed and thermally bonded between the tapes, in the embodiment, if the applied amount of the heat-resistant coating agent 5a is 0.005 to 1.0 g / m ² , the chuck When the tapes 1 and 2 were crushed by the side seal portions, adhesion failure did not occur, and air leakage from the side seal portions could be prevented.
[0036]
FIG. 8 shows a manufacturing sequence of a bag with the above-mentioned zipper, which has a gusset that is folded inward on both sides of the bag. (A)-(c) is a plan view of processing on the workbench as viewed from above, and (d)-(i) is a front view of processing on the workbench as viewed from the front.
In (a), a rectangular film F, which is a bag-forming sheet whose vertical length is cut to a predetermined size, is supplied. In (b), the protruding portion of the chuck tape on the wide side of the chuck 70 in a state where the male and female chuck portions are engaged with each other at a predetermined position of the film F is thermally welded to the film F. In (c), the film F is placed on the folding chuck 70. The side to which the chuck 70 is welded is referred to as an outer film 73, and the folded side is referred to as an outer film 72. (D) is a front view of (c). However, the scale is different between (c) and (d). In (e), the open ends 2x and 3x of the outer film 72 and the outer film 73 are overlapped, and both are sealed as ear pieces. The width Sa of this seal is, for example, 10 mm. The folded portion of the film F is denoted by Ya, and the inner connecting portion of the ear piece is denoted by Yb. In (f), the connecting portions on both sides of the outer film 72 and the outer film 73, that is, the folded portion Ya of the film F and the inner connecting portion Yb of the ear piece are folded inward to form side gussets 74 and 75. In (g), both sides are sealed at the connection between the outer film 73 and the side gussets 74 and 75 on both sides. The widths Sb and Sc of the seal are, for example, 10 mm. (H) shows the relationship between the chuck 70 and the seals 78 and 79 after the seal processing in (f). The seals 78 and 79 on both sides seal both ends of the chuck 70 with the film 73 crushed as described above. For this reason, crushing of the heat-resistant coating agent enables welding of the chuck tapes to each other and the chuck tape to the film 73, thereby enabling sealing. For this reason, air leakage does not occur and sealing is performed satisfactorily.
[0037]
Subsequently, welding of the outer films 72 and 73 and the chuck tapes of the chuck 70 is performed by applying pressure and heating from the outer surfaces of the films 72 and 73 using a hot plate in the manner described above. In this case, the folded portions of the side gussets 74 and 75 can be prevented from being welded by a layer structure of a film described later or by interposing a heat-resistant member in the folded portion.
[0038]
Also, at the connection between the side gussets 74 and 75 on both sides, both sides are sealed. Also, a triangular seal for sealing between the side gussets 74 and 75 at the corner of the bag and the film 72 or the film 73 for reinforcement or the like, and the side gussets 74 and 75 at the corner of the bag are closed so as not to open. Point seal is performed at a predetermined position. After these processes, the ear piece is cut in (i).
[0039]
As shown in FIG. 9, the film F is composed of a base material A (ON, nylon), a base material B (Al-PET, polyester on which aluminum is vapor-deposited), a sealant material (LLDPE, chain low-density polyethylene). ), And each layer is bonded with an adhesive. Then, as shown in FIG. 10, the side gusset 74 is formed such that the base material A (ON, nylon) layer of the film F of FIG. 9 is on the outside and the sealant material (LLDPE, ie, chain low-density polyethylene) layer is on the inside. (75) should be folded. In this manner, when the side gusset 74 is folded and heated and pressed from the surface of the outer film 72 to form the side seal 78 and the triangular seal 110, the inner surface of the outer film 72 and the side gusset 74 are formed. Are heat-welded between the inner surfaces of the LLDPE layers, but the outer surfaces of the side gussets 74 overlap with the ON layers of the base material A and are not heat-welded. The case where the chuck is thermally welded to the films 72 and 73 can be similarly performed.
[0040]
【The invention's effect】
According to the chuck of the first aspect, the chuck in which the chucked portion and the chuck portion are engaged is interposed between the two sheets, and the sheet and the chuck are heated by sandwiching the outer surface of each sheet with a hot plate. Although the tapes can be heat welded, the chuck tapes do not heat weld because of the heat-resistant layer. Therefore, unlike the conventional case, there is no need to interpose a heat-resistant member at the time of attaching the chuck, so that the bag can be easily manufactured and the manufacturing efficiency can be improved.
[0041]
According to the chuck of the second aspect, in addition to the same effect as the first aspect, the heat-resistant coating agent can be continuously applied along the long tape by using the application roller. Manufacturing becomes easy.
[0042]
According to the bag with the zipper according to the third aspect, the same effect as that of the first aspect is obtained.
[0043]
According to the bag with the zipper according to the fourth aspect, in addition to the same effect as the third aspect, the first zipper tape and the second zipper tape are thermally welded to each other by crushing the zipper and crushing the heat-resistant layer. Since it is possible to complete the sealing of the side seal portion, it is possible to prevent air leakage and to reduce the workability, which is an extremely simple operation.
[0044]
According to the bag with the zipper according to the fifth aspect, the same effect as that of the fourth aspect is obtained.
[0045]
According to the chuck manufacturing method of the sixth aspect, the same effect as that of the third aspect is obtained.
[0046]
According to the bag manufacturing method of the seventh aspect, the same effect as that of the first aspect is obtained.
[Brief description of the drawings]
FIG. 1 is a sectional view of a chuck according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing a manufacturing process of the chuck.
FIG. 3 is a detailed view of a part thereof.
FIG. 4 is a perspective view showing a coating step.
FIG. 5 is a partial sectional view showing a state where a chuck is attached to a bag.
FIG. 6 is a partial cross-sectional view illustrating a step of attaching the chuck.
FIG. 7 is a partial cross-sectional view illustrating a step of attaching another type of chuck.
FIG. 8 is an explanatory diagram of a manufacturing process of a bag with a gusset.
FIG. 9 is a sectional view of a film for forming a bag.
FIG. 10 is a partial perspective view showing a configuration of a gusset.
FIG. 11 is a partial sectional view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st zipper tape 2 2nd zipper tape 3 Chuck part 4 Chuck part 5 Heat resistant layer 5a Heat resistant coating agent 6 Heat resistant layer 8 Pressure roller 9 Application roller 30 Bag body 31 Bag forming sheet 32 Bag forming sheet 35 Hot plate 36 Hot plate 74 Side gusset 75 Side gusset

Claims (7)

A heat-sealable first chuck tape having a chuck portion along a longitudinal direction, and a heat-sealable second chuck tape having a chucked portion meshed with the chuck portion along the longitudinal direction; A chuck having a heat-resistant layer formed on opposing surfaces of the first chuck tape and the second chuck tape. The chuck according to claim 1, wherein the heat-resistant layer is a heat-resistant coating agent applied to the first chuck tape and the second chuck tape. The first chuck tape of the chuck according to claim 1 or 2 is thermally welded to the inner surface of the opening of the bag body, and the second chuck tape faces the first chuck tape on the inner surface of the opening. A bag with a chuck that is heat-welded to the position. The bag body has a side seal portion in which side portions of two bag forming sheets are heat-welded to each other, and ends of the first zipper tape and the second zipper tape are formed by the side seal portion. 4. The bag with a zipper according to claim 3, wherein the bag is crushed and welded between formed sheets. The bag with a zipper according to claim 4, wherein the bag body has a gusset on a side portion. 3. A step of preparing each chuck tape of the chuck according to claim 2, and passing the chuck tape between a pressure roller and an application roller to which a heat-resistant coating agent is supplied alongside the pressure roller. A method of manufacturing a chuck, comprising: applying a heat-resistant coating agent to a tape; drying the chuck tape; and winding the chuck tape around a winding drum. 3. A step of interposing the chuck between the portions forming the openings of the bags of the two bag forming sheets in a state where the chuck portion and the chucked portion of the chuck are engaged with each other; So that the heat-resistant layers of the first zipper tape and the second zipper tape come into contact with each other, so that the zipper is sandwiched and heated by a hot plate from the outside of the bag-forming sheet, and the first zipper is attached to the bag-forming sheet. A step of thermally welding the tape and the second zipper tape.

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