Packaging manufacturing apparatus and packaging manufacturing method

Abstract

To provide a package manufacturing apparatus capable of avoiding a sealing defect when manufacturing a package, especially the same using a thick and hard packaging material.SOLUTION: A package manufacturing apparatus for continuously manufacturing packages filled with contents comprises vertical sealing means 7 for welding a pair of packaging materials 20 and 30 in the longitudinal direction while conveying the packaging materials, filling means 8 that fills the contents, and horizontal sealing means 9 that welds the packaging materials in the width direction. As a pre-process of welding by the vertical sealing means 7, preheating means 100 is provided for preheating, from the inside, a portion where one packaging material of the packaging materials 20 and 30 and the other packaging material are overlapped with each other, and a vertical sealing position by the vertical sealing means in the longitudinal direction as a preheating point P.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a packaging body manufacturing apparatus that continuously produces packages filled with contents, and more particularly to a packaging body manufacturing apparatus and method for manufacturing packages using packaging materials with thickness and hardness, the apparatus comprising: a vertical sealing means for overlapping and feeding a pair of packaging materials while welding them in the longitudinal direction; a filling means for filling a filling section formed between the pair of packaging materials with contents; and a horizontal sealing means for intermittently welding the pair of packaging materials in the width direction. [Background technology]

[0002] Conventionally, a packaging manufacturing device has been widely used that joins the longitudinal ends of a long strip of material to form a cylindrical shape (vertical sealing), and then fills the contents into a bag-like interior and seals it (horizontal sealing).

[0003] In such packaging manufacturing equipment, it is known that sealing can be performed reliably and neatly by using a preheating device that uses hot air, as in the conventional inventions shown in, for example, JP 2009-149364 A (Patent Document 1), JP 2008-127031 A (Patent Document 2), and JP 2003-11230 A (Patent Document 3).

[0004] On the other hand, packaging that packages small amounts of food, medicine, or other contents that require hygiene control in one-time servings and that also have an attractive appearance are in widespread use, and in order to make the contents easier to remove in a more hygienic manner, a fold-open package is known in which a filling section is formed between a flat, strip-shaped packaging material (sheet material) and a flexible packaging material (sheet material) affixed to one side of the flat, strip-shaped packaging material, and an opening section that can be opened by breaking the flat, strip-shaped packaging material, as described in JP-B-55-36552 (Patent Document 4), is provided, which can be opened simply by folding the package and allows the contents to be dispensed by the pressure caused by the folding.

[0005] In addition, JP 2015-101370 A (Patent Document 5) presents a tear-open structure for a tear-open package having a thick portion having a hardness allowing it to be folded in half, a pair of thin bodies which are thinner and more flexible than the thick portion, a storage portion formed between the opposing surfaces of the pair of thin bodies for storing the contents, and a foil-like sealing material which is broken when the thick portion is folded, and which allows the contents to be removed from the package by tearing and opening a portion of the package in which the contents are enclosed. It is described that the sealing material is made of a thin foil such as aluminum foil, stainless steel foil, copper foil, iron foil, or a resin film made of polyvinylidene chloride.

[0006] It is desirable to perform preheating in order to improve sealing properties and production speed when continuously mass-producing each of the packages described in Patent Documents 4 and 5. However, each of the packages described in Patent Documents 4 and 5 is formed by combining a thick packaging material with a thin packaging body.

[0007] For this reason, the preheating devices described in Patent Documents 1, 2, and 3 are only intended for packages that use thin, film-like packaging materials, and even if the preheating devices described in Patent Documents 1, 2, and 3 are applied to packages that are thick or hard, more heat will be required during sealing depending on the thickness and hardness, and there is a risk of poor sealing due to insufficient heating.

[0008] More specifically, since the above-mentioned preheating device is based on the premise of joining the longitudinal ends of a long strip material to form a cylindrical shape, it is difficult to properly heat the area to be preheated, and even if preheated, there is a distance to the sealing position, so there is a possibility that insufficient heating will occur during sealing. In the first place, it is difficult to apply a preheating device that sandwiches a nozzle or plate material between two packaging materials that are thick and hard, especially when the sealing position is not limited to the ends but also includes the middle part.

[0009] Therefore, there has been a demand for a packaging manufacturing apparatus and a packaging manufacturing method that can avoid sealing defects, particularly when manufacturing a package using a packaging material that is thick and hard. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2009-14936 A [Patent Document 2] JP 2008-127031 A [Patent Document 3] JP 2003-11230 A [Patent Document 4] Special Publication No. 55-36552 [Patent Document 5] JP 2015-101370 A Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention is intended to solve the above-mentioned problems, and has an objective of providing a packaging body manufacturing device that can avoid poor sealing when manufacturing a package using a pair of packaging materials, particularly a package using a packaging material that is thick and hard. [Means for solving the problem]

[0012] The present invention has been made to solve the above problems, and provides a packaging manufacturing apparatus that includes a vertical sealing means for overlapping and feeding a pair of packaging materials while welding them in the longitudinal direction, a filling means for filling a filling portion formed between the pair of packaging materials with contents, and a horizontal sealing means for intermittently welding the pair of packaging materials in the width direction, and the packaging manufacturing apparatus continuously manufactures packaging materials filled with contents, As a preliminary process to welding by the vertical sealing means, a preheating means is provided which preheats from the inside the portion where one packaging material of the pair of packaging materials is overlapped with the other packaging material and the vertical sealing position by the vertical sealing means in the longitudinal direction as a preheating point.

[0013] In this way, by setting the preheating point by the preheating means to the portion where one packaging material of the pair of packaging materials is overlapped with the other packaging material and the vertical sealing position by the vertical sealing means in the longitudinal direction, the portion to be welded can be preheated directly. Therefore, even if the pair of packaging materials differ in at least one of thickness, hardness or material, sufficient preheating is possible, thereby achieving improved sealing performance and improved sealing speed.

[0014] Furthermore, when the preheating means is disposed between the one packaging material and the other packaging material, this is particularly desirable since it facilitates arrangement for preheating the preheating spot from the inside.

[0015] Furthermore, when multiple preheating means are provided in parallel, it is possible to preheat all necessary preheat points even if there are many residual heat points, not only in packaging body manufacturing equipment that manufactures packaging bodies in a single row in the width direction, but also in packaging body manufacturing equipment that simultaneously manufactures multiple rows of packaging bodies in the width direction.

[0016] The preheating means comprises an air supply pipe, a heater, and an outlet, When air supplied through the air supply pipe is heated by the heater and the hot air is sprayed toward the inside of the pair of packaging materials from the nozzle at the tip of the air supply pipe, thereby preheating both of the pair of packaging materials simultaneously from the inside, a preheating means can be constructed with a relatively simple and reliable structure using hot air.

[0017] Furthermore, if the preheating means has a heat detection means and a control means, and the heat detection means detects the temperature of the hot air heated by the heater and emits a signal, and the control means receives the signal and is able to adjust at least one of the temperature of the heater or the amount of air ejected per unit time from the nozzle, it becomes possible to perform appropriate preheating according to parameters such as the thickness, hardness, and material of the packaging material.

[0018] Furthermore, if a pair of rollers forming the vertical sealing means that vertically welds the pair of packaging materials are each provided with an individual driving means, and the drive and rotation speed of each roller can be adjusted individually, not only synchronous rotation but also asynchronous rotation becomes possible, and the feed speed and feed amount of the pair of packaging materials can be adjusted, allowing for welding with fine adjustments.

[0019] Furthermore, if at least one of the rollers that feed the pair of packaging materials is a heating roller equipped with a heating means, and at least one of the pair of packaging materials is preheated by the heating roller as a preliminary step to preheating by the preheating means, it is possible to preheat the packaging material during transport in addition to the preheating means, thereby further increasing the amount of preheating, thereby achieving improved sealing performance and sealing speed.

[0020] The method for producing a package according to the present invention, which has been made to solve the above problems, includes a vertical sealing process in which a pair of packaging materials, which differ in at least one of thickness, hardness, and material, are stacked and fed in the longitudinal direction, and the pair of packaging materials are welded in the longitudinal direction, a filling process in which contents are filled into a filling portion formed between the pair of packaging materials, and a horizontal sealing process in which the pair of packaging materials are intermittently welded in the width direction, and the method for producing a package filled with contents is continuous, The present invention is characterized in that a preheating step is included as a step preceding the vertical sealing step, and the preheating step preheats the pair of packaging materials by blowing hot air onto a preheating point where one packaging material and the other packaging material of the pair of packaging materials are superimposed and which is on an extension of a sealing position by the vertical sealing means in the longitudinal direction, using a preheating means that blows hot air, In this way, the preheating point by the preheating means is the part where one packaging material of the pair of packaging materials is overlapped with the other packaging material and is on an extension of the sealing position by the vertical sealing means in the longitudinal direction, and hot air is used as the heating method.As a result, even if a pair of packaging materials differ in at least one of thickness, hardness or material, sufficient preheating is possible with a relatively simple and reliable structure, and improved sealing performance and sealing speed can be achieved. Effect of the Invention

[0021] According to the present invention, the preheating means preheats the preheating area from the inside, which is the area where one packaging material of the pair of packaging materials is overlapped with the other packaging material and which is the vertical sealing position in the longitudinal direction by the vertical sealing means.Since the area to be welded can be preheated directly, it is possible to achieve improved sealing ability and sealing speed even if the packaging material used is a thick and hard material. [Brief description of the drawings]

[0022] [Figure 1] 1 is a vertical cross-sectional view showing an overall configuration of a packaging body manufacturing apparatus according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a simplified configuration diagram showing characteristic parts of the packaging body manufacturing apparatus of FIG. 1. [Diagram 3] 2A and 2B are diagrams showing sheet materials used in the packaging body manufacturing apparatus of FIG. 1, where (a) is a plan view showing the sheet material, and (b) is a plan view showing a narrow sheet material. [Figure 4] 2A and 2B are a perspective view and an enlarged cross-sectional view, respectively, showing a package manufactured by the package manufacturing apparatus of FIG. 1. [Diagram 5]2A, 2B, and 2C are a plan view, a front view, and a side view, respectively, showing a preheating means in the packaging body manufacturing apparatus of FIG. 1. [Figure 6] FIG. 6 is a simplified explanatory diagram illustrating a part of the mechanism, showing a state in which the preheating means in FIG. 5 is used. [Figure 7] 2A and 2B are a plan view and a perspective view showing a bending means in the packaging body manufacturing apparatus of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] Fig. 1 shows a vertical cross-sectional view of the configuration of a packaging manufacturing apparatus 1 according to the present embodiment, and Fig. 2 shows extracted characteristic parts of the packaging manufacturing apparatus 1. This packaging manufacturing apparatus 1 is an apparatus suitable for continuously manufacturing packaging bodies in which a filling portion is formed by overlapping the back faces of a pair of packaging materials 20, 30, each of which is made of a packaging material 30 made of a thick, flat resin sheet material 31 having thermoplasticity and a packaging material 20 made of a thin, strip-shaped film material 21, and thermally welding the back faces of the pair of packaging materials 20, 30 so as to surround the periphery, and filling the filling portion with contents. In this embodiment, a case of manufacturing a packaging body 4 having an opening portion 310 will be described.

[0025] The packaging body 4 is a conventionally well-known product formed by heat-welding a thinner and more flexible strip-shaped packaging material 20 to a flat, thick strip-shaped packaging material 30 having a perforation 311 (see FIG. 3(a)) that serves as an opening portion 310, and filling and sealing the contents 43 in a filling portion 42 formed therebetween (see FIG. 4).

[0026] In this embodiment, the width of the sheet material 31 constituting the packaging material 30 (and the film material 21 constituting the packaging material 20) is formed to a width sufficient to simultaneously produce two rows of packages in the width direction, but it may also be a narrower sheet material 32 sufficient to produce one row of packages in the width direction (see Figure 3(b)).

[0027] In addition, the dotted line in Figures 3(a) and (b) indicates the cut-out position when cutting the packaging body 5 from the packaging body in which the contents are sealed, and the symbol 33 (polka dot pattern mesh portion) indicates the preheating position of the packaging material 30 by the preheating means 100 (the vertical sealing position by the vertical sealing means 4).

[0028] Incidentally, other than the packaging body 4 having the aforementioned opening portion 310, the present invention can also be implemented in a packaging body manufacturing apparatus that manufactures packaging bodies from which the contents can be removed by opening means such as breaking, cutting or peeling.

[0029] The film material 21 constituting the packaging material 20 is a thin and flexible material, and therefore can be used as a raw material roll pre-wound around the drum 200. As for the packaging material 30, the sheet material 31 has a certain degree of flexibility and can be rolled up, and therefore can be used as a raw material roll pre-wound around the drum 300 in the same manner as the thinner packaging material 20.

[0030] The material constituting the sheet materials 31 and 32 is preferably a thermoplastic resin having a certain degree of thickness and hardness, such as polyethylene terephthalate.

[0031] In the packaging manufacturing apparatus 1 of this embodiment, two guide rollers 202, 203 are provided between the drum 200 and a feed roller 201 that pays out the packaging material 20 from the drum 200, and three guide rollers 204, 205, 206 are provided behind the feed roller 201.

[0032] Between the drum 300 and a feed roller 301 that feeds the packaging material 30 from the drum 300, three guide rollers 302, 303, and 304 are provided.

[0033] By arranging the feed rollers 201, 301 and the guide rollers 202, 203, 204, 205, 206, 302, 303, 304 in this manner, the packaging material 30 is less likely to be subjected to stress, particularly during feeding of the packaging material 30, and can be fed stably.

[0034] The unwound packaging materials 20, 30 are then overlapped by a pair of pulleys 5a, 5b and fed in the longitudinal direction.

[0035] Furthermore, the drums 200, 300 themselves may be rotated to unwind the packaging materials 20, 30 wound around the drums 200, 300, and the rotation speed may be adjustable.

[0036] The manufacturing process of the packaging body manufacturing apparatus 1 will be described with reference to Fig. 2. The packaging body manufacturing apparatus 1 of this embodiment includes vertical seal rollers 7a, 7b as vertical seal means 7 that welds both widthwise ends of a pair of packaging materials 20, 30 that are overlapped by a pair of pulleys 5a, 5b and fed in the longitudinal direction (feeds vertically downward as shown in the figure), a nozzle 8 as filling means that fills the space between the pair of packaging materials 20, 30 that have been welded at both ends to form a cylinder, horizontal seal rollers 9a, 9b as horizontal seal means 9 that intermittently welds the pair of cylindrical packaging materials 20, 30 in the width direction at a predetermined interval in the longitudinal direction, cooling rollers 10a, 10b as cooling means 10 that cools the horizontal seal position by the horizontal seal means 9 below, and roll cutters 11a, 11b as cutting means 11 that cuts the pair of packaging materials at the horizontal seal position.

[0037] In addition, in this embodiment, of the above-mentioned vertical sealing rollers and horizontal sealing rollers, only the vertical sealing roller 7a and horizontal sealing roller 9a on the packaging material 20 side are equipped with heaters as heating means, and a method is adopted in which welding is performed by heating from the packaging material 20 side.

[0038] This is because the inventors of the present application have found through experiments that the sealing work can be completed more efficiently in a shorter time by heating the packaging material 20 and fusing it to the packaging material 30. Of course, if both the vertical sealing rollers 7a, 7b and / or the horizontal sealing rollers 9a, 9b are provided with heaters whose drive and heat amount are variable, the versatility of the materials for the packages to be manufactured will be expanded.

[0039] As for the welding method, not only heat sealing but also various other welding methods such as impulse sealing and ultrasonic sealing can be used.

[0040] In addition, in this embodiment, the pair of vertical sealing rollers 7a, 7b that form the vertical sealing means 7 are each provided with a drive source (such as an electric motor, not shown) whose drive and rotation speed can be individually changed, making it possible to adjust the rotation speed of each of the vertical sealing rollers 7a, 7b individually and adjusting the feed speed and feed amount of the packaging materials 20, 30, thereby enabling welding with even more detailed adjustments.

[0041] In this embodiment, the vertical sealing rollers 7a, 7b each have three sealing portions in the axial direction and are used to vertically seal both ends and the center of a pair of packaging materials 20, 30 to produce two rows of packages in the width direction; however, for example, the vertical sealing rollers 7a, 7b each may have two sealing portions in the axial direction and be used to produce one row of packages in the width direction (not shown).

[0042] In order to adjust the rotation speed of the pair of vertical seal rollers 7a, 7b, it is preferable to adjust the feed speed and feed amount of the packaging materials 20, 30 by using a registration mark sensor or image processing (not shown).

[0043] Incidentally, reference numeral 41 denotes a continuous package which is a series of packages sealed lengthwise and widthwise before being cut and in which the contents are sealed.

[0044] In this embodiment, as shown in FIG. 2, a preheating process by preheating means 100, a bending process by bending means 6, a vertical sealing process by vertical sealing means 7, a filling process by filling means (nozzle 8), a horizontal sealing process by horizontal sealing means 9 and cooling means 10, and a cutting process by cutting means 11 are performed in that order.

[0045] The cooling rollers 10a, 10b are not essential, and the cooling rollers 10a, 10b may be omitted. The cutting process by the cutting means 11 does not have to be a series of processes in one manufacturing machine, and the continuous package 41 may be made into a completed product at one time, and then the cutting process may be performed by any cutting means such as a punch and die type punching machine.

[0046] The preheating means 100 comprises an air supply pipe 101, a heater 102, and an outlet 103. Air supplied through the air supply pipe 101 is heated by the heater 102, and the hot air is sprayed from the outlet 103 provided at the tip of the air supply pipe 101 toward the pair of packaging materials 20, 30 (see FIG. 5).

[0047] In this way, by using hot air as the preheating means 100, it is possible to easily preheat a pair of packaging materials 20, 30 simultaneously from the inside, and it is not dependent on the feed speed as in the case of conventional heating rollers. It is easy to adjust the amount of preheat, and it is possible to quickly preheat pinpoint areas, making it a relatively simple and reliable preheating means.

[0048] The preheating means 100 can be controlled by a control means provided in the packaging manufacturing apparatus 1, and in this embodiment, a control board (not shown) is used as the control means, and preheating can be adjusted according to the material and thickness of the packaging materials 20, 30 used.

[0049] The air supplied to the air supply pipe 101 can be air supplied from a pressurized gas source such as a compressor provided in the packaging manufacturing apparatus 1 or compressed air piping provided in the facility in which the packaging manufacturing apparatus 1 is installed.

[0050] In this embodiment, the heater 102 uses an electric heating wire as a heat source, which generates heat when electricity is applied. However, other conventionally known heat sources may also be used.

[0051] The air outlet 103 is provided in a direction to inject hot air onto a preheating spot P, which is a portion where the pair of packaging materials 20, 30 are overlapped and a vertical sealing position in the longitudinal direction by the vertical sealing means 4. The adjustment of the direction of the air outlet 103 is not limited to the above, and the aperture of the air outlet 103 may be made smaller than that of the air supply pipe 101 to adjust the flow rate.

[0052] In addition, the preheating means 100 has a heat detection means 104 which is a temperature sensor, and the heat detection means 104 detects the temperature of the hot air heated by the heater 102 and emits a signal, and the control means which receives the signal can adjust at least one of the temperature of the heater 102 or the amount of air ejected per unit time from the nozzle 103.

[0053] 6 is a simplified explanatory diagram of a part of the mechanism showing the use state of the preheating means 100. As shown in this figure, three preheating means 100 are provided in parallel, and each preheating means 100 blows hot air onto a preheating spot P, which is a portion where the pair of packaging materials 20, 30 are overlapped and a vertical sealing position in the longitudinal direction by the vertical sealing means 7, to simultaneously preheat the pair of packaging materials 20, 30 from the inside, making it possible to directly apply sufficient heat to the welding points of the pair of packaging materials for welding in a subsequent welding process, and thus making it possible to improve the sealing property and the sealing speed even if the packaging materials used are made of a material with a certain thickness or hardness.

[0054] Incidentally, reference numeral 23 (dot pattern mesh portion) indicates a preheating position of the packaging material 20 by the preheating means 100 (a vertical sealing position by the vertical sealing means 4).

[0055] Thereafter, the pair of packaging materials 20, 30 preheated by the preheating means 100 are transferred to the bending means 6 provided downstream of the preheating means 100.

[0056] FIG. 8 shows the bending means 6 of the present invention. The bending means 6 is configured by arranging opposite each other at a predetermined interval a heat-conductive, hard, block-shaped front member 61 having two recesses 62a, 62b extending longitudinally in the width direction on its inner surface and a heat-conductive, hard, block-shaped back member 63 having two protrusions 64a, 64b extending longitudinally in the width direction on its inner surface.

[0057] In addition, in this embodiment, heating means 65, which heats by passing hot air through it, is built into each of the front member 61 and the back member 63, and at least the recessed portions 62a, 62b of the front member 61 or the protruding portions 64a, 64b of the back member 63 are heated to a predetermined temperature. This makes it possible to heat without providing a separate heating roller, thereby saving space, and also makes it possible to perform heating and pressurization simultaneously by integrating the heating means and the forming means, thereby making it possible to more stably bend the material into a gutter shape.

[0058] The pair of packaging materials 20, 30 are passed through the gap between a front member 61 and a back member 63 arranged opposite each other at a specified distance while being heated by a heating means 65, so that the packaging materials protrude outward and are bent into a corrugated shape having multiple trough-shaped portions.

[0059] In this way, by bending a pair of packaging materials 20, 30 into a corrugated shape having multiple trough-shaped portions that convex in the surface direction, it is possible to form multiple filling sections, which has the advantage of easily realizing the simultaneous production of multiple rows of packaging bodies in the width direction and the manufacturing of packaging bodies filled with multiple types of contents.

[0060] Although the heating means 65 in this embodiment uses hot air, it may also use other heat sources such as Joule heat, steam, gas, and other heat sources.

[0061] One or both of the feed rollers 201, 301 may be provided with a heating means and used as a heating roller. The heating means may be one that uses hot air or Joule heat from an electric heating wire, but may also be one that uses various other heat sources including steam and gas.

[0062] Alternatively, a heated roller may be provided that is separate from the feed rollers and guide rollers.

[0063] By providing a heating roller in this manner, in addition to the preheating means 100, it is possible to preheat the packaging materials 20, 30 while they are being transported, thereby increasing the amount of preheating and further improving the sealing performance and sealing speed.

[0064] In each embodiment of the present invention, the pair of packaging materials constituting the package are described as being different in thickness, hardness and material, but it is also possible to use packaging materials of the same thickness, hardness or material. Also, while in this embodiment, bending is performed on one of the packaging materials 30, it goes without saying that bending may be performed on the other packaging material 20 or on both packaging materials 20, 30.

[0065] As described above, according to the present invention, by setting the preheating point by the preheating means to be the part where one packaging material of the pair of packaging materials is joined to the other packaging material for the first time and to be the vertical sealing position by the vertical sealing means in the longitudinal direction, poor sealing can be avoided even if the packaging material used is a material with thickness and hardness. [Explanation of symbols]

[0066] 1 packaging body manufacturing apparatus, 4 packaging body, 5a, 5b pulley, 6 bending means, 7 vertical sealing means, 7a, 7b vertical sealing roller, 8 nozzle, 9 horizontal sealing means, 9a, 9b horizontal sealing roller, 10 cooling means, 10a, 10b cooling roller, 11 cutting means, 11a, 11b roll cutter, 20 packaging material, 21 film material, 23 preheating position, 30 packaging material, 31, 32 sheet material, 33 preheating position, 41 continuous packaging body, 42 filling section, 43 contents, 61 front side member, 62a, 62b recessed portion, 63 back side member, 64a, 64b protruding portion, 65 heating means, 100 preheating means, 101 air supply pipe, 102 heater, 103 nozzle, 104 heat detection means, 200 drum, 201 Feed roller, 202, 203, 204, 205, 206 guide roller, 300 drum, 301 feed roller, 302, 303, 304, 305 guide roller, 310 opening part, 311 perforation, P preheating part

Claims

1. A packaging body manufacturing apparatus for continuously manufacturing packaging bodies filled with contents, comprising: vertical sealing means for overlapping and feeding a pair of packaging materials while welding them in a longitudinal direction; filling means for filling a filling portion formed between the pair of packaging materials with contents; and horizontal sealing means for intermittently welding the pair of packaging materials in a width direction, a preheating means for preheating a portion where one packaging material and the other packaging material of the pair of packaging materials are overlapped and a vertical seal position by the vertical seal means in the longitudinal direction as a preheating area from the inside as a preheating step before the welding by the vertical seal means; The preheating means has an air supply pipe, a heater, and an outlet, A plurality of the preheating means are arranged in parallel between the one packaging material and the other packaging material, The air supplied through the air supply pipe is heated by the heater, and the hot air is sprayed toward the inside of the pair of packaging materials from the nozzle provided at the tip of the air supply pipe, thereby preheating both of the pair of packaging materials from the inside simultaneously.

2. 2. The packaging material manufacturing apparatus according to claim 1, wherein the pair of packaging materials differ from each other in at least one of thickness, hardness, and material.

3. 3. The packaging material manufacturing apparatus according to claim 1, wherein three or more of said preheating means are provided in parallel.

4. 4. The packaging manufacturing apparatus according to claim 1, 2 or 3, characterized in that the preheating means has a heat detection means and a control means, the heat detection means detects the temperature of the hot air heated by the heater and issues a signal, and the control means receiving the signal is capable of adjusting at least one of the temperature of the heater or the amount of air ejected per unit time from the nozzle.

5. A packaging manufacturing apparatus as described in claim 1, 2, 3 or 4, characterized in that a pair of rollers which form the vertical sealing means for welding the pair of packaging materials vertically are each provided with an individual driving means, and the driving and rotation speed of each roller can be adjusted individually.

6. The packaging body manufacturing apparatus according to claim 1, 2, 3, 4 or 5, characterized in that at least one of the rollers that feed the pair of packaging materials is a heating roller having a heating means, and at least one of the pair of packaging materials is preheated by the heating roller as a preliminary process to preheating by the preheating means.

7. A method for continuously producing packages filled with contents, the method comprising: a vertical sealing process for overlapping a pair of packaging materials, which are different in at least one of thickness, hardness, and material, feeding the pair of packaging materials in a longitudinal direction, and welding the pair of packaging materials in the longitudinal direction; a filling process for filling a filling portion formed between the pair of packaging materials with contents; and a horizontal sealing process for intermittently welding the pair of packaging materials in a width direction, A preheating step is provided as a step preceding the vertical sealing step, and the preheating step uses a preheating means for blowing hot air to preheat a preheating point where one packaging material and the other packaging material of the pair of packaging materials are superimposed and which is a vertical sealing position in the longitudinal direction, and The preheating means has an air supply pipe, a heater, and an outlet, A plurality of the preheating means are arranged in parallel between the one packaging material and the other packaging material, A method for manufacturing a packaging body, characterized in that air supplied through the air supply pipe is heated by the heater, and the hot air is sprayed toward the inside of the pair of packaging materials from the nozzle provided at the tip of the air supply pipe, thereby preheating both of the pair of packaging materials from the inside simultaneously.

8. 8. The method for producing a package according to claim 7, wherein three or more of the preheating means are provided in parallel.

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