WO2016051470A1

WO2016051470A1 - Bag-making device and bag-making method

Info

Publication number: WO2016051470A1
Application number: PCT/JP2014/075918
Authority: WO
Inventors: 英昭和知
Original assignee: キョーラク株式会社
Priority date: 2014-09-29
Filing date: 2014-09-29
Publication date: 2016-04-07
Also published as: CN106715106B; JPWO2016051470A1; CN106715106A; JP5767761B1

Abstract

Provided are a bag-making device and a bag-making method capable of improving the productivity of microwave oven packaging bags. The bag-making device (10) is equipped with: a sheet-cutting and -dividing unit (37) for cutting and dividing a film sheet (31) in the width direction; a first conversion roller (51) and a second conversion roller (52) for respectively converting a first film sheet (41) and a second film sheet (42) from a second orientation in which the width direction is perpendicular to the horizontal direction to a first orientation in which the width direction is horizontal; and a folding unit (53) for forming a pair of flaps, which extend in the running direction, in the first film sheet (41) that has been converted to the first orientation. The first conversion roller (51) and the second conversion roller (52) are disposed so that the first conversion roller (51) extends diagonally upward toward the front of the running direction and the second conversion roller (52) extends diagonally downward toward the front of the running direction, and so that the center position in the width direction of the first film sheet (41) converted to the first orientation matches with the center position in the width direction of the second film sheet (42) converted to the first orientation.

Description

Bag making apparatus and bag making method

The present invention relates to a bag making apparatus and a bag making method.

A packaging bag in which two films are laminated to form a bag is widely used.
Conventionally, in this type of packaging bag, a technique has been proposed in which a flap is formed on one of two films, and a steam vent seal is provided on the flap (see, for example, Patent Document 1).

Patent Document 1 uses a composite film having at least one surface made of a sealant layer, and a lower member having a sealant surface as an upper surface, and an upper member having a wing portion formed at least on a side portion and having the sealant surface as a lower surface. A packaging bag is disclosed which is superposed and sealed by sealing its peripheral edge. In this packaging bag, a point seal portion connected to the folded portion of the wing portion is formed in the central region in the wing portion, and at least one easy-to-steam means is provided in the point seal portion.

According to this packaging bag of Patent Document 1, the seal part of the point seal is peeled and retracted by the heat and pressure of steam generated by microwave heating, without forming a steam escape port in advance during heating, It is dissipated out of the bag through easy-to-steam means.

By the way, while the productivity improvement of the packaging bag for microwave ovens is demanded, a manufacturing technique for continuously and automatically producing the packaging bag provided with the flap is demanded. However, Patent Document 1 does not disclose a specific manufacturing technique for increasing the productivity of a packaging bag for a microwave oven.

In Patent Document 2, a packaging film fed out from a raw fabric roll is cut in half by a cutter, and then the cut bag front side film and bag rear side film are bonded together and aligned in the width direction of the film. A bag making apparatus for producing a self-supporting bag is disclosed, but there is no description about a technique for producing a packaging bag for a microwave oven having a flap.

Furthermore, in recent years, there has been a demand for a technique that can further improve the sealing performance while maintaining the steam discharge function in the packaging bag for the microwave oven having the folding flap. However, in the packaging bag of patent document 1, the whole side part is heat-welded including the both right-and-left both ends of a folding | returning part. In this case, if the left and right ends of the folded portion, which is thicker than the other portions, are heat welded with the seal bar, the seal bar floats at other portions other than the left and right ends of the folded portion, and the wing portion (flap) The side portions of each other are not welded satisfactorily, resulting in a problem that the sealing performance is lowered.

Japanese Patent No. 3908529 JP 2003-33981 A

This invention is made | formed in view of such a situation, The objective is that the packaging bag for microwave ovens which has a flap can be produced continuously and automatically, and the packaging bag for microwave ovens is produced. An object of the present invention is to provide a bag making apparatus and a bag making method capable of improving productivity.

Another object of the present invention is to provide a packaging bag for a microwave oven and a bag making method thereof, which can improve the sealing performance while maintaining the steam discharge function in the folding flap.

In order to achieve such an object, the present invention is grasped by the following configuration.
(1) A first aspect of the present invention is a pair of microwave oven packages arranged in the width direction of the film sheet while feeding the long belt-like film sheet from the raw roll and running the fed film sheet. A bag making apparatus for manufacturing a bag, wherein the film sheet fed from the raw roll in a first direction in which the width direction is horizontal is converted into a second direction in which the width direction is vertical. A cutting line is formed along a running direction on the roller and the film sheet converted into the second direction, and the film sheet is cut in the width direction by the cutting line and the first film sheet on the upper side and the second film on the lower side. A sheet cutting unit for cutting into a film sheet, and each of the first film sheet and the second film sheet is converted from the second direction to the first direction again. For the first conversion roller and the second conversion roller, and the first film sheet converted in the first direction, a flap that is folded in a palm shape and extends along the traveling direction is provided with the pair of packaging bags for microwave ovens. Corresponding to the first film sheet in the width direction center position, a pair of folding portions, a heat welding portion for heat-welding the superimposed first film sheet and the second film sheet, and the heat welding A cutting section that cuts the first film sheet and the second film sheet that are heat-welded by a section into a predetermined length to obtain the pair of packaging bags for microwave ovens. Forming the cutting line at a position where the width of one film sheet is wider than the width of the second film sheet, and cutting the film sheet; The conversion roller is disposed at a predetermined angle, the first conversion roller extends along a diagonally upward direction forward in the traveling direction with respect to the cutting line, and the second conversion roller is in the traveling direction with respect to the cutting line. A center position in the width direction of the first film sheet that extends along the obliquely downward direction to the front and converted into the first direction, and a width direction of the second film sheet that is converted into the first direction It is arranged so that it is aligned with the center position.

(2) A second aspect according to the present invention is a pair of microwave oven packages arranged in the width direction of the film sheet while feeding the long belt-like film sheet from the raw roll and running the fed film sheet. A bag making apparatus for manufacturing a bag, wherein the film sheet fed from the raw roll in a first direction in which the width direction is horizontal is converted into a second direction in which the width direction is vertical. A cutting line is formed along a running direction on the roller and the film sheet converted into the second direction, and the film sheet is cut in the width direction by the cutting line and the first film sheet on the upper side and the second film on the lower side. A sheet cutting unit for cutting into a film sheet, and each of the first film sheet and the second film sheet is converted from the second direction to the first direction again. For the first conversion roller and the second conversion roller, and the first film sheet converted in the first direction, a flap that is folded in a palm shape and extends along the traveling direction is provided with the pair of packaging bags for microwave ovens. Corresponding to the first film sheet in the width direction center position, a pair of folding portions, a heat welding portion for heat-welding the superimposed first film sheet and the second film sheet, and the heat welding A cutting section that cuts the first film sheet and the second film sheet that are heat-welded by a section into a predetermined length to obtain the pair of packaging bags for microwave ovens. The cut line is formed at a position where the width of one film sheet is wider than the width of the second film sheet by an amount corresponding to the folding amount of the pair of flaps, and the film sheet is formed. The first conversion roller and the second conversion roller are arranged at a predetermined angle, and the first conversion roller extends along a diagonally upward direction forward in the running direction with respect to the cutting line, The second conversion roller extends along a diagonally downward direction forward in the running direction with respect to the cutting line, and the second conversion roller is moved toward the first direction of the first film sheet by the first conversion roller. The first film converted into the first direction is arranged so that it can be converted into the first direction by delaying the second film sheet by an amount corresponding to the folding amount of the pair of flaps rather than the conversion. The center position in the width direction of the film sheet is aligned with the center position in the width direction of the second film sheet converted into the first direction.

(3) In the configuration of (1) or (2), the folding portion is positioned above a center plate that presses a center portion in the width direction of the first film sheet, and both end portions in the width direction of the center plate, It is good also as having a pair of side plate which folds a said 1st film sheet above the both ends of the width direction of the said center board, and forms a pair of said flap.

(4) According to a third aspect of the present invention, there is provided a pair of microwave oven packages arranged in a width direction of the film sheet while feeding the long belt-like film sheet from the raw roll and running the fed film sheet. A bag-making method for manufacturing a bag, wherein the film sheet is unwound from the raw roll in a first direction in which the width direction is horizontal, and the width direction of the unrolled film sheet is vertical. A first conversion step for converting the film sheet into the second direction, and forming a cutting line along the traveling direction of the film sheet converted into the second direction, and the first film sheet in the width direction by the cutting line. And a sheet cutting step for cutting into a second film sheet, and each of the first film sheet and the second film sheet in the second direction A second conversion step for converting again into the first direction, and a flap that is folded in a palm shape and extends along the running direction with respect to the first film sheet converted into the first direction. A folding step of forming a pair of the first film sheet across the center position in the width direction corresponding to a packaging bag for a microwave oven, and a thermal welding step of heat-welding the superimposed first film sheet and second film sheet And a cutting step of cutting the first film sheet and the second film sheet that are heat-welded to a predetermined length to obtain the pair of packaging bags for microwave ovens, The film sheet is cut so that the width of one film sheet is wider than the width of the second film sheet by an amount corresponding to the folding amount of the pair of flaps.
In the secondary conversion step, the first film sheet is converted into the first direction by a first conversion roller, and the second film sheet is converted by the second conversion roller to correspond to the folding amount of the pair of flaps. The center position in the width direction of the first film sheet converted into the first direction by converting the first film sheet into the first direction later than the conversion of the first film sheet into the first direction. And the center position in the width direction of the second film sheet converted into the first direction.

(5) A fourth aspect of the present invention is a pair of microwave oven packages in which the traveling first film sheet and the second film sheet are bonded together and aligned in the width direction of the first film sheet and the second film sheet. A bag manufacturing method for manufacturing a bag, wherein a flap that is folded into a palm shape and extends along a running direction is formed in the pair of microwave oven packaging bags in the first film sheet wider than the second film sheet. Correspondingly, a pair of the first film sheet is formed across the center position in the width direction, and the folding step of forming the first film sheet in substantially the same width as the second film sheet, the center position in the width direction and the side edge position. A heat welding step of superposing and heat-welding the first film sheet and the second film sheet that are aligned with each other.

(6) The 5th viewpoint which concerns on this invention is a packaging bag for microwave ovens, Comprising: Two films, The left-and-right side seal part formed by heat-welding the side parts of the said two films, A storage portion formed between the two films and capable of storing contents, wherein one of the two films is formed between the left and right side seal portions. A flap is provided, and the flap is a tongue-like portion obtained by folding the one film into a palm shape, and a pair of plane portions that overlap each other, a folded portion that connects upper sides of the pair of plane portions, A communication part formed on the lower side part of the pair of plane parts and communicating with the housing part; and left and right side seal parts formed by thermally welding the left and right side parts of the pair of plane parts; The folded portion is formed on the left and right end portions of the side. Department each other a unsealed portion not thermally welded, and having the unsealed portions permit vapors to escape from the receiving portion from the inside to the outside of the flap.

(7) In the configuration of (6), a horizontal seal portion further having a steam vent seal portion protruding in a substantially V shape on the communication portion side at a central portion and connecting the left and right side seal portions; The steam vent seal portion is provided between the steam vent seal portion and the folded portion, and releases the steam from the steam vent seal portion from the inside of the flap to the outside when the steam vent seal portion is peeled off by the steam pressure of the housing portion. It is good also as having a notch.

(8) In the configuration of (7), the cut may be formed in a semicircular shape.

(9) A sixth aspect of the present invention is a bag-making method for a microwave packaging bag, in which two traveling films are bonded together to form a bag, and one of the two films is formed. The film is folded into a palm shape and formed into a flap along the running direction, and the side portions of the pair of flat portions constituting the flap are thermally welded to form left and right side seal portions. A thermal welding step, wherein in the thermal welding step, the side portions are thermally welded to avoid the left and right end portions of the folded portion of the flap, whereby the accommodating portions are provided at the left and right end portions of the folded portion. An unsealed portion is formed for releasing steam from the inside of the flap to the outside.

According to the present invention, there are provided a bag making apparatus and a bag making method capable of continuously and automatically producing a microwave packaging bag having a flap and capable of improving the productivity of the microwave oven packaging bag. be able to.

Further, according to the present invention, it is possible to provide a packaging bag for a microwave oven and a bag making method of the packaging bag for a microwave oven that have a steam discharge function and a higher sealing property in a folding flap.

It is a perspective view of the packaging bag for microwave ovens concerning the embodiment of the present invention. It is a top view of the packaging bag for microwave ovens shown by FIG. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is action | operation explanatory drawing of the flap shown by FIG. It is a figure explaining the other example of the packaging bag for microwave ovens which concerns on embodiment, and is the figure drawn corresponding to FIG. It is a figure explaining another example of the packaging bag for microwave ovens which concerns on embodiment, and is the figure drawn corresponding to FIG. It is a top view of the continuum of the packaging bag for microwave ovens concerning an embodiment. It is a perspective view which shows notionally the bag making apparatus which concerns on embodiment. It is a figure explaining the drawing | feeding-out process which concerns on embodiment, and is a perspective view of the film sheet drawn | fed out from a raw fabric roll. It is a top view of the film sheet shown by FIG. It is a figure explaining the sheet | seat cutting process which concerns on embodiment, and is a perspective view of a sheet | seat cutting part, a 1st conversion roller, and a 2nd conversion roller. It is a figure explaining the secondary conversion process which concerns on embodiment, and is the figure which looked at the film sheet from the downstream of the apparatus. It is explanatory drawing of the secondary conversion process which concerns on a comparative example, and is the figure drawn corresponding to FIG. It is a figure explaining the folding process which concerns on embodiment, and is the figure which looked at the 1st film sheet from the upper direction of the apparatus. FIG. 15 is a sectional view taken along line BB in FIG. 14.

(Embodiment)
DESCRIPTION OF EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the accompanying drawings. The same number is attached | subjected to the same element through the whole description of embodiment.

(Microwave packaging bag 10)
First, a microwave oven packaging bag 10 according to an embodiment will be described with reference to FIGS.

As shown in FIG. 1, a microwave packaging bag 10 is a packaging body in which two films including a rectangular first film 11 and a rectangular second film 12 are formed in a bag shape. .

As shown in FIG. 2, the microwave packaging bag 10 includes an end seal portion 13 that becomes a bottom portion when the contents are filled, an opening portion 15 that is not heat-welded toward the upper side when the contents are filled, and a first portion. And left and right side seal portions 16 formed by thermally welding the side portions of the film 11 and the second film 12. The microwave packaging bag 10 is a space formed between the first film 11 and the second film 12 and surrounded by the left and right side seal portions 16 and the end seal portion 13, and can accommodate contents. 17. In the microwave packaging bag 10, the contents are filled from the opening 15 into the accommodating portion 17 with the opening 15 facing upward, and then the opening 15 is thermally welded and sealed.

As shown in FIG. 3, one of the two films (here, the first film 11) has a flap 18 formed between the left and right side seal portions 16 (see FIG. 2).

The flap 18 is a tongue-like portion in which the first film 11 is folded in the shape of a palm, and includes a pair of flat portions 18a that overlap each other, a folded portion 18b that connects upper sides of the pair of flat portions 18a, and a pair of flat surfaces. And a communication portion 18 c formed on the lower side portion of the portion 18 a and communicating with the accommodating portion 17. The length h of the flap 18 (corresponding to the distance from the folded portion 18b to the communication portion 18c) can be set as appropriate.

Return to Figure 2. As shown in FIG. 2, when the flap 18 is heated, the left and right side seal portions 18 d formed by thermally welding the left and right side portions of the pair of flat portions 18 a and the microwave packaging bag 10 are heated. It has a peelable steam release seal 18e at the center and a horizontal seal 18f that connects the left and right side seals 18d. Further, the flap 18 is provided between the steam vent seal portion 18e and the folded portion 18b, and when the steam vent seal portion 18e is peeled off due to the steam pressure of the accommodating portion 17, the steam from the steam vent seal portion 18e is removed from the flap 18. It has a notch 18g that escapes from the inside to the outside. In FIG. 2, a semicircular cut 18g formed along the vapor vent seal portion 18e is shown as an example of the cut 18g. The left and right ends of the folded portion 18b located on the left and right side portions of the flat portion 18a are portions where the side portions of the flat portion 18a are not thermally welded to each other. An unsealed portion 23a that escapes from the inside to the outside is formed.

The steam release seal portion 18e has a shape that is curved and protrudes in a substantially V shape toward the communication portion 18c, and is a communication portion more than a line Q connecting two start points P1 and P2 that start the curved shape. The left and right inclined portions 18e1 are formed on the 18c side and are inclined from the two start points P1 and P2, respectively, and the left and right inclined portions 18e1 intersect with each other. The seal width of the base portion 18f1 of the horizontal seal portion 18f is formed so as to narrow toward the center, and the seal width of the inclined portion 18e1 is further narrower than the seal width of the center portion of the base portion 18f1.

On the first film 11 and the second film 12, various display portions 21 that display images, characters, and the like related to products can be printed. As shown in FIGS. 9 to 13 to be described later, a plurality of display portions 21 are provided on the first film 11 that is the front side of the product and the second film 12 that is the back side.

As shown in FIG. 4, in the microwave packaging bag 10, when the moisture of the contents is heated in the microwave oven and the internal pressure of the storage portion 17 rises, the storage portion 17 expands, and the distal end portion of the steam release seal portion 18 e The force is concentrated on 18e2. As a result, in the steam release seal portion 18e, the two flat portions 18a are peeled off starting from the tip end portion 18e2, and the vapor from the peeled steam release seal portion 18e is flapped via the unsealed portion 23a and the cut 18g. 18 is discharged well from the inside to the outside. At this time, by setting the seal width of the base portion 18f1 of the horizontal seal portion 18f wider than that of the inclined portion 18e1, the base portion 18f1 of the horizontal seal portion 18f is not peeled (remains), and only the vapor release seal portion 18e is peeled off. be able to. Thereby, since the edge part 22 which protruded from the base part 18f1 to the communication part 18c side is formed, when the vapor | steam in the accommodating part 17 discharge | releases outside the flap 18, a part of vapor | steam collides with the edge part 22. FIG. Thereby, the flow of steam fluctuates to generate vortices, and sound can be generated at the steam vent seal portion 18e.

As a constituent material of the 1st film 11 and the 2nd film 12, if the films are materials which can be heat-welded, it is arbitrary, for example, the plastic film which has the heat seal property used for a normal packaging bag is applied. Is possible. Examples of the plastic film include a single-layer film made of a thermoplastic resin having heat-sealability, a multilayer film in which sheets of thermoplastic resin having heat-sealability are laminated with other thermoplastic resins, and the like. . Examples of the material having good heat sealability include known low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer. Olefin resins such as olefin resins graft-modified with an ethylenically unsaturated carboxylic acid or its anhydride, polyamides or copolyamide resins having a relatively low melting point or a low softening point, polyester or copolyester resins, polycarbonate resins, etc. It is done. Moreover, various barrier films can be used as another plastic material to be laminated. In the case where a laminated film is used, it is preferable that the thermoplastic resin layers having a good heat seal property such as a resin having a low melting point be heat-welded with the inner surfaces thereof.

(Another example of the microwave packaging bag 10)
Next, another example of the microwave packaging bag 10 will be described with reference to FIGS.
As shown in FIG. 5, when the pair of flat surface portions 18 a are not heat-welded and when the steam release seal portion 18 e is peeled off due to the vapor pressure of the housing portion 17, the steam from the steam release seal portion 18 e is removed. The unsealed portion 23b that escapes from the inside of the flap 18 to the outside can be provided in the side seal portion 18d separately from the unsealed portion 23a. In this case, the base portion 18f1 of the horizontal seal portion 18f is formed to have substantially the same width, and the entire horizontal seal portion 18f including the substantially V-shaped steam vent seal portion 18e is formed in a substantially M shape. As a result, a steam passage is formed between the base portion 18f1 and the folded portion 18b. The unsealed portion 23b can be provided on at least one of the left and right side seal portions 18d, and the number of unsealed portions 23b is arbitrary.

Further, as shown in FIG. 6, the entire horizontal seal portion 18f having a substantially V-shaped steam vent seal portion 18e is formed in a substantially M shape, and a semicircle is formed between the steam vent seal portion 18e and the folded portion 18b. A shaped cut 18g may be provided.

(Bag making apparatus 30 and bag making method)
Next, the bag making apparatus 30 and the bag making method according to the embodiment will be described with reference to FIGS.

(Configuration of continuous body 10A)
Prior to the description of the bag making apparatus 30 and the bag making method, the continuous body 10A of the microwave packaging bag 10 to be manufactured will be described.

As shown in FIG. 7, the continuous body 10 </ b> A has a configuration in which two microwave oven packaging bags 10 are connected by an end seal portion 13, and the continuous body 10 </ b> A is cut by a center line C of the end seal portion 13. The two microwave oven packaging bags 10 can be separated, and each of the separated two microwave oven packaging bags 10 can be used as one package.

(Configuration of bag making apparatus 30)
As shown in FIG. 8, the bag making apparatus 30 is an apparatus that manufactures a continuous body 10 </ b> A (see FIG. 7) by processing a film sheet 31 while being driven by a plurality of feed rollers 32.

The bag making apparatus 30 includes a feeding unit 35 that feeds the film sheet 31 from the raw roll 33, a direction changing roller 36 that converts the direction of the film sheet 31, and a sheet cutting unit 37 that cuts the film sheet 31. Furthermore, the bag making apparatus 30 includes the first conversion roller 51 and the second conversion roller 52 that convert the directions of the cut upper first film sheet 41 and the lower second film sheet 42 and the flap 18 ( A folding part 53 for forming a sheet), a heat welding part 55 for bonding the first film sheet 41 and the second film sheet 42 by heat welding to form a bag, and a notch 18g (see FIG. 7) are formed. And a cutting portion 57 that cuts the first film sheet 41 and the second film sheet 42 into a continuous body 10A (see FIG. 7).

(Description of bag making method)
The bag making method for manufacturing the continuous body 10A using the bag making apparatus 30 includes a feeding process, a primary conversion process, a sheet cutting process, a secondary conversion process, a folding process, a thermal welding process, a cutting process, and a cutting process. Hereinafter, each process is demonstrated one by one.

(Feeding process)
As shown in FIG. 9, in the feeding process, a feeding unit 35 having a supply shaft 35a is used. The original fabric roll 33 is obtained by winding a long belt-like film sheet 31 on which the display unit 21 is printed, around a winding core 33a, and is rotatably supported by a supply shaft 35a.

As shown in FIG. 10, the film sheet 31 is a first film sheet 41 in which a region on one side in the width direction forms the first film 11 (see FIG. 7) across the planned cutting line 58. The area on the other side is a second film sheet 42 forming the second film 12 (see FIG. 7). In this film sheet 31, since the pair of flaps 18 (see FIG. 7) has not yet been formed, the width (W + α) of the first film sheet 41 is greater than the width W of the second film sheet 42. The position of the planned cutting line 58 is set so as to be wide by an amount corresponding to the folding amount (approximately four times the length h of the flap 18 (see FIG. 3)) (see FIG. 7).

In the unwinding process, the film sheet 31 is unwound from the original roll 33 and is moved downstream by the feed roller 32 in the first direction in which the width direction is horizontal (the first film sheet 41 and the second film sheet 42 are aligned in the horizontal direction). Supply to the side. In the following description, the film sheet 31 is caused to travel such that the width direction is perpendicular to the “first direction” (the first film sheet 41 and the second film sheet 42 are aligned in the vertical direction). This is referred to as “second orientation”.

(Primary conversion process)
In the primary conversion step, the direction conversion roller 36 (see FIG. 8) inclined at an inclination angle of 45 ° with respect to the horizontal direction is used, and the film sheet 31 fed out in the first direction is set to 90 ° in the second direction. Change direction.

(Sheet cutting process)
As shown in FIG. 11, in the sheet separating step, the sheet separating unit 37 causes the film sheet 31 converted into the second direction to travel while meandering by the plurality of feed rollers 32, thereby applying tension to the film sheet 31. While adding, the film sheet 31 is cut | disconnected by the cutting means 37a (for example, cutter) along a running direction (length direction). More specifically, the film sheet 31 converted into the second direction is cut by the cutting means 37a along the planned cutting line 58, and the film sheet 31 is turned into the first film sheet 41 and the second film sheet 42 in the width direction. Carve out.

(Secondary conversion process)
As shown in FIG. 12, in the secondary conversion step, the first conversion roller that converts the cut first film sheet 41 and second film sheet 42 from the second direction to the first direction by 90 ° again. 51 and the second conversion roller 52 are used. The first conversion roller 51 and the second conversion roller 52 are arranged at a predetermined angle. In this example, the first conversion roller 51 and the second conversion roller 52 are arranged in a horizontal V shape at an angle of 90 ° on the same vertical plane.

The first conversion roller 51 has a proximal end portion 51a located on the side of the cutting line 38 formed by the cutting means 37a, and with respect to the cutting line 38 at an inclination angle of 45 ° with respect to the horizontal direction from the proximal end portion 51a. It extends along a diagonally upward direction forward in the running direction. On the other hand, in the second conversion roller 52, the base end portion 52a is located on the cutting line 38 side, and the base end portion 52a moves forward in the traveling direction with respect to the cutting line 38 at an inclination angle of 45 ° with respect to the horizontal direction. It extends along the diagonally downward direction. Then, the first conversion roller 51 and the second conversion roller 51 are arranged such that the end surface 52b of the base end portion 52a of the second conversion roller 52 faces the peripheral surface 51b of the base end portion 51a of the first conversion roller 51 with a gap. The rollers 52 are arranged so as to be shifted in the traveling direction of the film sheet 31. More specifically, the one side edge 41a of the first film sheet 41 and the one side edge 41a of the second film sheet 42 are approximately 2 of the folding amount of one flap 18, that is, the length h (see FIG. 3). The 1st conversion roller 51 and the 2nd conversion roller 52 are arrange | positioned so that it may shift | deviate in the width direction only by the distance L equivalent to double. Thereby, the width direction center position C1 of the first film sheet 41 converted into the first direction and the width direction center position C2 of the second film sheet 42 converted into the first direction are aligned.

The first film sheet 41 converted into the first direction passes through the upper path 61 (see FIG. 8) by the plurality of feed rollers 32 and descends. On the other hand, the second film sheet 42 converted into the first direction passes through the lower path 62 (see FIG. 8) and rises by the plurality of feed rollers 32. And the 1st film sheet 41 and the 2nd film sheet 42 overlap in the state where the width direction center positions C1 and C2 were aligned.

On the other hand, as shown in FIG. 13, if the positions of the base end portion 51 a of the first conversion roller 51 and the base end portion 52 a of the second conversion roller 52 are aligned in the traveling direction of the film sheet 31, One side edge 41a of the first film sheet 41 and one side edge 42a of the second film sheet 42 are aligned. In this case, the width direction center position C1 of the first film sheet 41 and the width direction center position C2 of the second film sheet 42 are shifted by a distance δ (approximately twice the length h (see FIG. 3)). The first film sheet 41 and the second film sheet 42 cannot be stacked one above the other in the width direction center positions C1 and C2.

In this regard, in the present embodiment, as shown in FIG. 12, the base end portion 52 a of the second conversion roller 52 and the base end portion 51 a of the first conversion roller 51 are shifted in the traveling direction of the film sheet 31. Thus, since the second film sheet 42 narrowed by the distance L can be delayed and converted to the horizontal direction with respect to the direction change of the wide first film sheet 41, the width direction center positions C1 and C2 are aligned. The 1st film sheet 41 and the 2nd film sheet 42 can be piled up and down.

(Folding process)
As shown in FIG. 14, the folding portion 53 is used in the folding step. The folding portion 53 includes a central plate 53a that holds the central portion in the width direction of the first film sheet 41, and a pair of side plates 53b that overlap the upper ends of both widthwise end portions of the central plate 53a and correspond to the pair of flaps 18 (see FIG. 7). And composed of The upstream end portions 53a1 and 53b1 of the center plate 53a and the pair of side plates 53b each have a shape that tapers toward the upstream side of the first film sheet 41.

As shown in FIG. 15, in the folding step, one side plate 53 b has a part of the first film sheet 41 on the upper side of the central plate 53 a on one side in the width direction of the first film sheet 41 converted into the first direction. Are folded to form one flap 18. At the same time, on the other side in the width direction of the first film sheet 41, the other side plate 53b folds a part of the first film sheet 41 to the upper side of the central plate 53a to form one flap 18. Thereby, a pair of flap 18 which pinches | interposes the width direction center position C1 of the 1st film sheet 41 is formed corresponding to a pair of packaging bag 10 for microwave ovens (refer FIG. 7). Since the first film sheet 41 in a state where the pair of flaps 18 is formed is reduced in width by an amount α (see FIG. 10) corresponding to the folding amount of the pair of flaps 18, it is substantially the same as the width W of the second film sheet 42. The same width is formed. As a result, the left and right side edge positions of the first film sheet 41 and the left and right side edge positions of the second film sheet 42 are aligned.

(Thermal welding process)
In the heat welding step, a heat welding portion 55 (see FIG. 8) is used. The heat welding part 55 (refer FIG. 8) is the heat seal means 55a (refer FIG. 8) which heat-welds the end seal part 13 (refer FIG. 7) along the running direction of the 1st film sheet 41 and the 2nd film sheet 42. FIG. ), And heat seal means 55b (see FIG. 8) for performing thermal welding of the side seal portion 16 (see FIG. 7) along the width direction of the first film sheet 41 and the second film sheet 42.

Further, in the heat welding step, the flap 18 (see FIG. 7) is also heat-welded, but the lateral seal portion 18f (see FIG. 7) and the side seal portion 18d (see FIG. 7) are heat-sealed

means

55a, 55b (see FIG. 7). You may form using another heat sealing means (illustration omitted) independent of FIG. When forming the lateral seal portion 18f and the side seal portion 18d, a plurality of seal bars arranged so as to sandwich the flap 18 can be used. Further, the side portions of the pair of flat portions 18a (see FIG. 7) constituting the flap 18 are thermally welded to form the left and right side seal portions 18d. At that time, the folded portion 18b (see FIG. 7). The side portions of the flat surface portion 18a are thermally welded while avoiding the left and right end portions, thereby forming unsealed portions 23a (see FIG. 7) at the left and right end portions of the folded portion 18b. Further, when the unsealed portion 23b (see FIG. 5) is provided, in the thermal welding process, in the thermal welding of the side seal portion 18d (see FIG. 5), heat welding is performed on at least a part of the left and right side seal portions 18d. The part which is not done is formed.

(Cutting process)
In the cutting step, a semicircular cut 18g (see FIG. 7) is formed in each of the pair of flaps 18 (see FIG. 7) using the cut portion 56 (see FIG. 7).

(Cutting process)
In the cutting process, the first film sheet 41 and the second film sheet 42 that have been heat-welded are cut into a predetermined length using a cutting portion 57 (see FIG. 7) that is configured by a cutter or the like, and then the microwave packaging. A continuous body 10A (see FIG. 7) in which a pair of bags 10 is formed is obtained.

(Effect of embodiment)
The effects of the embodiment described above will be described.
According to this embodiment, since the first conversion roller 51 and the second conversion roller 52 are arranged so that the center positions C1 and C2 in the width direction of the first film sheet 41 and the second film sheet 42 are aligned, the flap 18 is The pair of microwave packaging bags 10 (continuous body 10A) can be produced continuously and automatically, and the productivity of the microwave packaging bag 10 can be improved. Moreover, the display parts 21 printed on the first film sheet 41 and the second film sheet 42 can be overlapped as desired.

Further, in this embodiment, the unsealed portions 23a that allow the steam from the accommodating portion 17 to escape from the inside of the flap 18 to the left and right ends of the folded portion 18b are formed.

On the other hand, when the entire side part of the flat portion 18a including the left and right ends of the folded portion 18b is heat-welded, the thickness of the left and right end portions of the folded portion 18b is larger than that of the other portions. When the seal bar is applied to the entire side part of the slab, the seal bar floats from other parts other than the left and right end parts of the folded part 18b, resulting in a problem that the side parts are not well welded.

In this respect, in the present embodiment, the side portions are thermally welded to avoid the left and right end portions of the folded portion 18b which is thicker than the other portions, so that the seal bar does not float, and the side seal portion 18d. Can be formed satisfactorily. Therefore, it is possible to provide the microwave oven packaging bag 10 and the bag making method that have improved sealing performance while maintaining the steam discharge function.

In the present embodiment, the folding flap 18 of the microwave packaging bag 10 is provided with a substantially V-shaped steam vent seal portion 18e. As a result, when the moisture in the contents is heated in the microwave oven and the internal pressure of the accommodating portion 17 increases, a force is applied intensively to the tip end portion 18e2 of the steam release seal portion 18e, and two planes are formed in the steam release seal portion 18e. The part 18a is peeled off satisfactorily, and the vapor from the peeled part is discharged well from the inside of the flap 18 through the unsealed part 23a and the cut 18g. As described above, by adopting the substantially V-shaped steam vent seal portion 18e, the steam discharge function can be further enhanced in the microwave packaging bag 10 having the folding flap 18.

As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Microwave oven packaging bag, 10A ... Continuous body, 11 ... 1st film, 12 ... 2nd film, 13 ... End seal part, 15 ... Opening part, 16 ... Side seal part, 17 ... Housing part, 18 ... Flap , 18a ... plane portion, 18b ... folded portion, 18c ... communication portion, 18d ... side seal portion, 18e ... steam release seal portion, 18f ... side seal portion, 18f1 ... base portion, 18g ... notch, 23a ... unsealed portion, DESCRIPTION OF SYMBOLS 30 ... Bag making apparatus, 31 ... Film sheet, 33 ... Original fabric roll, 35 ... Feeding part, 36 ... Direction changing roller, 37 ... Sheet cutting part, 37a ... Cutting means, 38 ... Cutting line, 41 ... 1st film Sheet, 42 ... second film sheet, 51 ... first conversion roller, 51a ... proximal end, 51b ... circumferential surface, 52 ... second conversion roller, 52a ... proximal end, 52b ... end face, 53 ... folding 53a ... center plate, 53a1 ... end, 53b ... side plate, 53b1 ... end, 55 ... heat weld, 56 ... notch, 57 ... cut, W ... width of second film sheet, α ... pair of L: distance corresponding to the amount of folding of one flap, C1: center position in the width direction of the first film sheet, C2: center position in the width direction of the second film sheet, corresponding to the amount of folding of the flap

Claims

A bag making apparatus for producing a pair of microwave oven packaging bags lined up in the width direction of the film sheet while running the fed film sheet from a roll of raw paper and running the fed film sheet,
A direction changing roller for converting the film sheet fed from the raw roll in a first direction in which the width direction is horizontal, into a second direction in which the width direction is vertical;
A cutting line is formed along the running direction on the film sheet converted into the second orientation, and the film sheet is cut by the cutting line in the width direction with an upper first film sheet and a lower second film sheet. A sheet carving part to carve,
A first conversion roller and a second conversion roller for converting each of the first film sheet and the second film sheet from the second direction to the first direction again;
The first film sheet converted into the first direction has a flap that is folded in a palm shape and extends along the running direction, and corresponds to the pair of microwave packaging bags. A pair of folds formed across the center position in the direction;
A heat welding portion for heat-welding the first film sheet and the second film sheet,
A cutting part that cuts the first film sheet and the second film sheet heat-welded by the heat-welding part into a predetermined length to obtain the pair of packaging bags for microwave ovens;
With
The dividing unit forms the cutting line at a position where the width of the first film sheet is wider than the width of the second film sheet, and cuts the film sheet.
The first conversion roller and the second conversion roller are arranged at a predetermined angle, and the first conversion roller extends along a diagonally upward direction forward in the traveling direction with respect to the cutting line, and the second conversion roller A roller extends along a diagonally downward direction forward in the running direction with respect to the cutting line, and is converted into the center position in the width direction of the first film sheet converted into the first direction and the first direction. Further, the bag making apparatus is arranged so that the second film sheet is aligned with the center position in the width direction.
A bag making apparatus for producing a pair of microwave oven packaging bags lined up in the width direction of the film sheet while running the fed film sheet from a roll of raw paper and running the fed film sheet,
A direction changing roller for converting the film sheet fed from the raw roll in a first direction in which the width direction is horizontal, into a second direction in which the width direction is vertical;
A cutting line is formed along the running direction on the film sheet converted into the second orientation, and the film sheet is cut by the cutting line in the width direction with an upper first film sheet and a lower second film sheet. A sheet carving part to carve,
A first conversion roller and a second conversion roller for converting each of the first film sheet and the second film sheet from the second direction to the first direction again;
The first film sheet converted into the first direction has a flap that is folded in a palm shape and extends along the running direction, and corresponds to the pair of microwave packaging bags. A pair of folds formed across the center position in the direction;
A heat welding portion for heat-welding the first film sheet and the second film sheet,
A cutting part that cuts the first film sheet and the second film sheet heat-welded by the heat-welding part into a predetermined length to obtain the pair of packaging bags for microwave ovens;
With
The dividing portion forms the cutting line at a position where the width of the first film sheet is wider than the width of the second film sheet by an amount corresponding to the folding amount of the pair of flaps. Carve
The first conversion roller and the second conversion roller are arranged at a predetermined angle, and the first conversion roller extends along a diagonally upward direction forward in the traveling direction with respect to the cutting line, and the second conversion roller A roller extends along a diagonally downward direction forward of the running direction with respect to the cutting line, and the second conversion roller is more than the conversion of the first film sheet into the first direction by the first conversion roller. The width of the first film sheet converted into the first direction by delaying the second film sheet by an amount corresponding to the folding amount of the pair of flaps and being arranged so as to be convertible into the first direction. A bag making apparatus, wherein a direction center position and a width direction center position of the second film sheet converted into the first direction are aligned.
The folding portion is
A central plate for pressing the widthwise central portion of the first film sheet;
A pair of side plates that are positioned above both widthwise ends of the central plate and that fold the first film sheet above the widthwise opposite ends of the central plate to form the pair of flaps. The bag making apparatus according to claim 1 or 2.
It is a bag making method for producing a pair of packaging bags for microwave ovens arranged in the width direction of the film sheet while running the fed film sheet from a raw roll and running the fed film sheet,
An unwinding step of unwinding the film sheet from the raw roll in a first direction in which the width direction is horizontal;
A primary conversion step of converting the fed film sheet into a second direction in which the width direction is vertical;
Forming a cutting line along the traveling direction of the film sheet converted into the second direction, and separating the film sheet into a first film sheet and a second film sheet in the width direction by the cutting line; and ,
A secondary conversion step of converting each of the first film sheet and the second film sheet from the second direction to the first direction again;
The first film sheet converted into the first direction has a flap that is folded in a palm shape and extends along the running direction, and corresponds to the pair of microwave packaging bags. A folding step of forming a pair with a center position in the direction;
A thermal welding step of thermally welding the first film sheet and the second film sheet,
A cutting step of obtaining the pair of packaging bags for microwave ovens by cutting the first film sheet and the second film sheet that are heat-welded to a predetermined length;
With
In the cutting step, the width of the first film sheet corresponds to the folding amount of the pair of flaps, and the film sheet is cut to be wider than the width of the second film sheet,
In the secondary conversion step, the first film sheet is converted into the first direction by a first conversion roller, and the second film sheet is converted by the second conversion roller to correspond to the folding amount of the pair of flaps. The center position in the width direction of the first film sheet converted into the first direction by converting the first film sheet into the first direction later than the conversion of the first film sheet into the first direction. And a center position in the width direction of the second film sheet converted into the first direction.
Bonding the traveling first film sheet and the second film sheet, a bag making method for manufacturing a pair of microwave packaging bags arranged in the width direction of the first film sheet and the second film sheet,
The first film sheet having a width wider than that of the second film sheet is provided with a flap that is folded in a palm shape and extends in the running direction, and corresponds to the pair of microwave packaging bags in the width direction of the first film sheet. Forming a pair with a center position in between, and forming the first film sheet in substantially the same width as the second film sheet;
And a heat welding step of heat-welding the first film sheet and the second film sheet, the center position of which is aligned in the width direction and the side edge position.