JP2003312682A - Tubular packaging member, packaging bag, method and apparatus for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high quality and inexpensive tubular packaging member and a packaging bag free from a heat seal failure, a cut seal and breakage or the like. <P>SOLUTION: The tubular packaging member and the packaging bag are molded by heat-sealing using a planar laminate sheet including an inner layer made of a first polyolefin having a first softening point, and an outer layer made of a second polyolefin having a second softening point higher than the first softening point. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag formed by heat sealing, a tubular packaging member for forming the packaging bag, a method for producing the same, and an apparatus for producing the same.

[0002]

2. Description of the Related Art Conventionally, a packaging member made of a resin film such as polyethylene can be easily heat-sealed by heating it to a temperature at which it can be heat-sealed and pressing it. It is widely used for manufacturing the package of the shape. However, since such a resin film does not have good thermal conductivity, a temperature difference is generated between the film surface on the side where the heating member contacts at the time of heat sealing and the film surface on the opposite side where the actual heat fusion occurs. Also, the heating is not uniform. By this, the heat sealing step, for example, the heat sealing step after filling the contents,
Alternatively, heat sealing becomes insufficient in a heat sealing process or the like when the end portion on the package side is subjected to a gusset process, which causes a problem such as leakage of contents.

On the other hand, if the heating temperature is too high,
Since the resin itself is decomposed and heat sealing becomes impossible, it has been usually dealt with by lengthening the heating time. However, if the heating time is lengthened, the production efficiency is lowered and the cost of the package is increased. Further, when the heating time becomes long, the resin film is excessively melted, a seal break occurs during heat sealing, or the toughness of a portion which is excessively melted and solidified is lowered, and the quality thereof is easily damaged. There was a problem that it was not stable. This problem is especially noticeable when gusseting is applied, and if the heating time is extended to match the side edges where the four films overlap, the resin will become excessive in the central area where only the two films overlap. The above-mentioned problems are likely to occur due to excessive melting. Therefore, in the conventional technology,
It was difficult to mass-produce a gusseted package with high quality and low cost.

In recent years, from the viewpoint of environmental problems, various products including resin products have been tried to reduce waste and promote reuse. Reusable resins are classified according to their structure, and it is not necessary to separate resins that belong to the same class, but there is a problem that resins that belong to different classes cannot be reused unless they are sorted.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is a high-quality and low-cost cylinder which does not cause heat seal failure, seal breakage, breakage, or the like. To provide a strip-shaped packaging member.

A second object of the present invention is to provide a high-quality and low-cost packaging bag which does not cause heat seal failure, seal breakage, breakage, or the like.

A third object of the present invention is to provide a method for producing a tubular packaging member, which can obtain a high-quality tubular packaging member at low cost without causing heat seal failure, seal breakage, and breakage. It is in.

A fourth object of the present invention is to provide a method of manufacturing a packaging bag which can obtain a high-quality packaging bag at low cost without causing heat seal failure, seal breakage, breakage and the like.

A fifth object of the present invention is to provide an apparatus for manufacturing a tubular packaging member which can obtain a high-quality tubular packaging member at a low cost without causing heat seal failure, seal breakage, breakage and the like. Especially.

A sixth object of the present invention is to provide a packaging bag manufacturing apparatus which can obtain a high-quality packaging bag at low cost without causing heat seal failure, seal breakage, breakage, and the like.

[0011]

A tubular packaging member according to the present invention has an inner layer made of a first polyolefin having a first softening point and a second softening point higher than the first softening point. It is characterized by being heat-sealed using a flat laminated sheet including an outer layer made of a second polyolefin.

The packaging bag of the present invention comprises an inner layer made of a first polyolefin having a first softening point and an outer layer made of a second polyolefin having a second softening point higher than the first softening point. It is characterized by being molded by heat-sealing using a strip-shaped laminated sheet containing the same.

The method of manufacturing a tubular packaging member according to the present invention is the first
While transporting in the longitudinal direction a strip-shaped laminated sheet including an inner layer made of a first polyolefin having a softening point and an outer layer made of a second polyolefin having a second softening point higher than the first softening point, Introduced on a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet,
Both longitudinal end portions of the strip-shaped laminated sheet are bent along the center seal guide plate, and one longitudinal end portion and the other longitudinal end portion of the folded strip-shaped laminated sheet are aligned and heat-sealed to form a cylinder. It is characterized in that it includes a step of molding a sheet-shaped laminated sheet.

The method for producing a packaging bag according to the present invention comprises an inner layer made of a first polyolefin having a first softening point and a second polyolefin having a second softening point higher than the first softening point. While being conveyed in the longitudinal direction, the strip-shaped laminated sheet including the outer layer is introduced onto a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and both of the strip-shaped laminated sheets are guided along the center seal guide plate. A step of bending the longitudinal end portion, heat-sealing by aligning one longitudinal end portion and the other longitudinal end portion of the folded strip-shaped laminated sheet, and molding the tubular laminated sheet; It is characterized by comprising a step of heat-sealing in the width direction to form the bottom.

The apparatus for manufacturing a tubular packaging member according to the present invention comprises a strip-shaped laminated sheet supply section for feeding the strip-shaped laminated sheet, a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and the center seal guide plate. A center seal heating member for forming a tubular laminated sheet by heat-sealing one longitudinal end and the other longitudinal end of the strip-shaped laminated sheet whose both longitudinal ends are bent along It is characterized by doing.

The packaging bag manufacturing apparatus of the present invention comprises a strip-shaped laminated sheet feeding section for feeding the strip-shaped laminated sheet, a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and a center seal guide plate along the center seal guide plate. A heating portion for a center seal for heat-sealing one longitudinal end portion and the other longitudinal end portion of a strip-shaped laminated sheet having both longitudinal end portions bent to form a tubular laminated sheet; And a bottom seal heating unit for heat-sealing the laminated sheet in the width direction.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a planar laminated sheet containing at least an internally fusible thermoplastic resin as an inner layer is used.

The laminated sheet includes an inner layer made of a first polyolefin having a first softening point and an outer layer made of a second polyolefin having a second softening point higher than the first softening point.

The tubular packaging member and the packaging bag of the present invention are molded by heat sealing using this laminated sheet.

In the tubular packaging member and the packaging bag of the present invention, the inner layer has a lower softening point than the outer layer. For this reason,
The outer layer, which comes into contact with the heating member during heat sealing, has a high softening point and thus is unlikely to melt, and the inner layer, which contributes to heat fusion, can be fused at a relatively low temperature. Thereby, even if there is a difference in heating temperature between the outer layer and the inner layer during heat sealing, or even if the heating is slightly uneven, the inner layers having a low softening point can be sufficiently fused.

Further, since the outer layer has a high softening point, the polyolefin is not excessively melted. As described above, the tubular packaging member and the packaging bag of the present invention can be efficiently and sufficiently heat-sealed, and the heat-sealed portion does not cause heat-sealing failure, seal breakage, breakage, or the like.

Furthermore, according to the present invention, since the inner layer and the outer layer of the laminated sheet used are made of the same polyolefin, the inner layer and the outer layer can be reused without being separated. The used packaging member and the packaging bag including the inner layer and the outer layer can be effectively reused, for example, as a raw material for the intermediate layer between the inner layer and the outer layer used in the present invention. In this case, the laminated sheet used in the present invention can be obtained by, for example, coextruding the raw materials for the inner layer, the intermediate layer, and the outer layer to form a film.

FIG. 1 is a sectional view showing an example of the laminated sheet used in the present invention.

As shown in the figure, the laminated sheet 23 is
A layer 21 made of a first polyolefin having a first softening point and a layer 22 made of a second polyolefin having a second softening point higher than the first softening point.

FIG. 2 is a sectional view showing another example of the laminated sheet used in the present invention.

The laminated sheet 25 shown in FIG. 2 has an intermediate layer 24, which is an extruded laminated layer, between the layer 21 made of the first polyolefin and the layer 22 made of the second polyolefin. It has the same configuration as in FIG.

The difference between the first softening point and the second softening point is preferably 40 to 100 ° C.

The first softening point is preferably 70 to 90 ° C., and the second softening point is 100 to 170.
C. is preferred.

The first polyolefin and the second polyolefin are a combination of polyethylene and polyethylene,
It is preferably selected from a combination of polypropylene and polypropylene, and a combination of polypropylene and polyethylene.

The tubular wrapping member forms a center seal portion by directly heat-sealing the inner layer at one end of the flat laminated sheet having a rectangular or strip shape and the outer layer at the other end opposite to the inner layer to form a tubular seal. Can be molded into. Alternatively, the center-sealed portion may be formed by directly heat-sealing the inner layer at one side end facing the inner layer at the one side end of the rectangular or strip-shaped planar laminated sheet to form a tubular shape. Alternatively, the inner layer at one side end and the inner layer at the other side end can be indirectly heat-sealed via another member capable of heat fusion.

FIGS. 3 and 4 are views showing examples of the tubular packaging member directly heat-sealed, and FIG. 5 is a diagram showing an example of the tubular packaging member indirectly heat-sealed.

The tubular packaging member 1 shown in FIG. 3 is a laminated sheet composed of a polyethylene inner layer having a softening point of 80 ° C. and a polyethylene outer layer having a softening point of 105 ° C. in the center seal portion 2. The inner layer of one side end and the outer layer of the other side end facing each other are directly heat-sealed.

As shown in FIG. 4, in the cylindrical wrapping member 1, the inner layer of one side end of the laminated sheet similar to that of FIG. Have a configuration.

Further, as shown in FIG. 5, the tubular packaging member 3
Is, for example, 95 at the center seal portions 4 and 5.
Heat-sealing tape 6 made of polyethylene having a softening point of ℃
3 has a structure in which the inner layer of one side end and the inner layer of the other side end facing each other are heat-sealed at both longitudinal ends, respectively.

Further, the packaging bag further has a bottom portion obtained by heat-sealing one opening portion in addition to the configuration of the tubular packaging member. The contents can be accommodated by putting the contents through the other opening of the molded packaging bag and heat-sealing the other opening.

6 to 8 show a packaging bag formed by using the tubular packaging members shown in FIGS. 3 to 5, respectively.

As shown in FIG. 6, this packaging bag 7 has the same structure as that of FIG. 3 except that it has a bottom portion 8 formed by heat sealing in a direction perpendicular to the axial direction of the tubular packaging member 1. .

As shown in FIG. 7, this packaging bag 17 has the same structure as that of FIG. 3 except that it has a bottom portion 18 formed by heat sealing in a direction perpendicular to the axial direction of the tubular packaging member 15. .

As shown in FIG. 8, this packaging bag 9 has the same structure as that of FIG. 5 except that it has a bottom portion 10 formed by heat sealing in a direction perpendicular to the axial direction of the tubular packaging member 3. .

The method for producing a tubular packaging member of the present invention is an example of a method for producing the above tubular packaging member, which comprises an inner layer made of a first polyolefin having a first softening point, A center seal guide having a width narrower than the width of the strip-shaped laminated sheet while conveying the strip-shaped laminated sheet including an outer layer made of a second polyolefin having a second softening point higher than the first softening point in the longitudinal direction. Introduced on the plate, bend both longitudinal ends of the strip-shaped laminated sheet along the center seal guide plate, align one longitudinal end of the folded strip-shaped laminated sheet with the other longitudinal end, and perform heat sealing And forming a tubular laminated sheet.

The formed tubular laminated sheet can be wound into a roll if necessary.

The method for producing a packaging bag of the present invention is a method for producing the packaging bag described above, which comprises a step of forming the tubular laminated sheet in the method of producing the tubular packaging member described above, and then a tube. The method further includes the step of heat-sealing the sheet-shaped laminated sheet in the width direction to form the bottom portion.

If necessary, a step of cutting the tubular laminated sheet at the bottom or on the downstream side can be further provided.

The tubular packaging member manufacturing apparatus of the present invention is an apparatus to which the above-described tubular packaging member manufacturing method can be applied, and includes a belt-shaped laminated sheet supply section for feeding the belt-shaped laminated sheet, and a belt-shaped laminated sheet. A center seal guide plate having a width narrower than the width, and one longitudinal end and the other longitudinal end of the strip-shaped laminated sheet whose longitudinal ends are bent along the center seal guide plate are heat-sealed. And a heating member for a center seal for forming a tubular laminated sheet.

If necessary, a tubular packaging member winding portion for winding the formed tubular laminated sheet in a roll shape can be further provided.

Furthermore, the packaging bag manufacturing apparatus of the present invention is an apparatus to which the above-mentioned packaging bag manufacturing method can be applied, and in addition to the above-mentioned tubular packaging member manufacturing apparatus, the tubular laminated sheet is provided in the width direction. It has a bottom-sealing heating part for heat-sealing.

If necessary, a bottom seal portion or a cutting portion for cutting the tubular laminated sheet on the downstream side thereof can be further provided.

The method and apparatus for manufacturing a tubular packaging member for a packaging bag according to the present invention comprises an inner layer made of a first polyolefin having a first softening point and a second softening point higher than the first softening point. Since the band-shaped laminated sheet including the outer layer made of the second polyolefin is applied, the inner layer having a low softening point can be sufficiently heat-sealed without increasing the heating time at the time of heat sealing, and the softening point is high. The outer layer polyolefin is not excessively melted. Therefore, by using the method and apparatus for manufacturing a tubular packaging member of the present invention, efficient and sufficient heat sealing can be performed, and the heat sealing portion causes poor heat sealing, seal breakage, damage, etc. There is nothing to do. Moreover, since the laminated sheet in which the inner layer and the outer layer are made of the same polyolefin is used, the obtained tubular packaging member can be easily reused without sorting.

Further, the tubular packaging member and the packaging bag of the present invention can be gusseted by forming a crease in the axial direction after molding using the above-mentioned laminated sheet.

FIG. 9 shows an example of a tubular packaging member that has been gusseted, and FIG. 10 shows an example of a packaging bag that has been gusseted.

As shown in FIG. 9, this tubular packaging member 11
Has the same configuration as that of FIG. 3 except that it has a gusset portion 12 folded on its side surface in the axial direction.

Further, as shown in FIG. 10, this packaging bag 1
3 has the same configuration as that of FIG. 6 except that it has a bottom portion 14 formed by heat sealing in a direction perpendicular to the axial direction of the tubular packaging member 11.

Although FIGS. 9 and 10 show the structure in which the inner layer at one side end of the laminated sheet and the outer layer at the other side end opposite to each other are directly heat-sealed in the center seal portion, other than the above, A structure in which the inner layer of one side end facing the inner layer of the one side end of the sheet is directly heat-sealed, and a center seal portion is indirectly heat-sealed through another member having heat melting property. Can be used.

Even if the tubular packaging member and the packaging bag of the present invention are gusseted as described above, since the laminated sheet used has a lower softening point in the inner layer than in the outer layer, The lower inner layer can be sufficiently fused. Further, since the outer layer has a high softening point, the polyolefin is not excessively melted. In this way, the gusseted tubular packaging member and the packaging bag according to the present invention are efficient,
Sufficient heat sealing is possible, and the heat sealing portion does not suffer from heat sealing failure, seal breakage, breakage, or the like.

In the above example, the bottom portion of the packaging bag is heat-sealed perpendicularly to the axial direction of the tubular packaging member to form the bottom portion, but the bottom portion may be heat-sealed if necessary.

FIG. 11 is a diagram showing an example of a packaging bag in which a ship bottom type is heat-sealed.

As shown in the figure, this packaging bag 20 has the same construction as that of FIG. 10 except that it has a bottom portion 19 which is heat-sealed in a ship bottom type.

Another example of the packaging bag is a packaging bag provided inside a box-in-box type container.

FIG. 12 is a diagram showing an example of a box-in-box type container. As shown, this container 26 is
For example, an outer box 27 made of paper and having an outlet,
It has a box-shaped packaging bag 30 housed in an outer box 27 and having an opening 29 communicating with the outlet 28.

As a method for producing a gusseted tubular packaging member, for example, an inner layer made of a first polyolefin having a first softening point and a second softening point higher than the first softening point are used. While the belt-shaped laminated sheet including the outer layer made of the second polyolefin is conveyed in the longitudinal direction, it is introduced onto a center seal guide plate having a width narrower than the width of the belt-shaped laminated sheet, and the belt-shaped laminated sheet is formed along the center seal guide plate. A step of bending both longitudinal end portions of the sheet, aligning one longitudinal end portion of the folded strip-shaped laminated sheet with the other longitudinal end portion and performing heat sealing to form a tubular laminated sheet; A pair of gusseting guides having a width smaller than that of the center seal guide plate, facing each other at intervals, and facing each other at intervals. , And in the vicinity of both ends of the gusset machining guide plates, respectively, on the inner side of the side end part thereof,
The other part is introduced to the gusset processing part having a pair of gusset processing plates arranged so as to extend outward from the side end parts, and the pair of gusset guide plates are passed through the inside of the cylinder of the tubular laminated sheet to form a pair of gussets. The processed plate is abutted from the outer surface of the tubular laminated sheet, the abutted portion of the tubular laminated sheet is folded into the gap between the gusset guide plates, and the folded tubular laminated sheet is attached to the gusset guide plate surface. And a step of forming a gusseted tubular laminated sheet by pressing from a vertical direction.

As a method for producing a gusseted packaging bag, in the gusseted tubular packaging member, after the step of forming the gusseted tubular laminated sheet, the tubular laminated sheet is widthwise. The method further includes the step of heat sealing to form the bottom.

The shape of the heat seal in the width direction may be a band shape parallel to the width direction or an arbitrary shape such as a ship bottom type.

As a device for producing a tubular packaging member that has been gusseted, a strip-shaped laminated sheet feeding section for feeding the strip-shaped laminated sheet, a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and a center seal guide A center seal heating member for forming a tubular laminated sheet by heat-sealing one longitudinal end and the other longitudinal end of the strip-shaped laminated sheet whose both longitudinal ends are bent along the plate. A pair of gusseted guide plates that have a width narrower than that of the center seal guide plate and are arranged to face each other at intervals, and a part of each of the gusseted guide plates near the both end portions between the gusseted guide plates. A device having a gusseted portion having a pair of gusseted plates arranged so as to extend inside the end portion and to extend the other portion outside the side end portion can be used.

As an apparatus for producing a gusseted packaging bag, in addition to the above-mentioned apparatus for producing a tubular packaging member,
An apparatus having a bottom-sealing heating unit for heat-sealing the tubular laminated sheet in the width direction can be used.

The shape of the heat seal in the width direction by the bottom-sealing heating portion may be a band shape parallel to the width direction or an arbitrary shape such as a ship bottom type.

FIG. 13 shows a top view of an example of the packaging bag manufacturing apparatus of the present invention.

FIG. 14 shows a side view of FIG. 12 perpendicular to the flow direction.

As shown in the figure, this manufacturing apparatus was fed with an original fabric portion 31 having a strip-shaped laminated sheet wound in a roll shape, a laminated sheet supply portion 32 for delivering the laminated sheet from the original fabric portion 31. A center press part 33 including a center seal guide plate (not shown) and a center seal heating member (not shown) for forming a tubular laminated sheet by bending both longitudinal ends of the laminated sheet and heat sealing, and a center seal for cooling the same. Cooling part 34, a pair of gusset processing guide plates 35a, 35b, and gusset processing plate 39a for applying gusset processing to the obtained tubular laminated sheet
39b and gusset folding auxiliary disks 38a, 38b
A gusseted portion 36, a side seal portion 40 for pressing the gusseted portion, a side cooling portion 41 for cooling the pressed portion thereafter, and a heat seal for transversely sealing the tubular laminated sheet. It has a bottom seal heating section 42, a bottom seal cooling section 43 for cooling the bottom seal section, and a cutter 45 for cutting the bottom seal section or a desired position downstream thereof.

FIG. 15 is a view of the center seal plate viewed from above, and FIG. 16 is a side view of FIG. 15 viewed from a direction perpendicular to the flow direction.

The center seal plate 50 is a flat plate having a substantially uniform thickness, and has a shape in which one end of the flat plate has a uniform width and the other end tapers from the middle. As shown in the drawing, one end having a uniform width on the right side is arranged upstream in the flow direction, and the other tapered end is arranged downstream.

FIG. 17 is a view of the gusseted portion 36 seen from above, and FIG. 18 is a side view seen from a direction perpendicular to the flow direction.
19 is a sectional view taken along line XX ′ of FIG. 18, and FIG. 20 is a view of Y of FIG.
-Y 'sectional drawing is each shown.

The gusset processing portion 36 is arranged to face each other at a predetermined interval, and a pair of gusset processing guide plates 35a and 35b and the end portions in the flow direction of the pair of gusset processing guide plates 35a and 35b. One of the gusset plates 39a, 39b, and the gusset folding auxiliary circles, each part of which is located inside the side end and the other part is located outside the side end. Board 38
a and 38b.

In the apparatus shown in FIGS. 13 and 14, the roll-shaped strip-shaped laminated sheet of the raw material portion 31 is composed of a polyethylene outer layer having a softening point of, for example, 105.degree.
It is composed of a polyethylene inner layer having a softening point of 0 ° C., is sent from the laminated sheet sending-out part 32 to the center press part 33, and is sent out to the center seal plate 50 in the center press part 33 shown in FIGS. 15 and 16. .

The center seal plate 50 has a width narrower than the width of the strip-shaped laminated sheet. The strip-shaped laminated sheet has its inner layer directed toward the center seal plate 50.
0 is passed through the lower surface of the center seal plate 50, and both side ends thereof are pulled up to the upper surface of the center seal plate 50 and bent along the side end portions of the center seal plate 50. The both ends of the strip-shaped laminated sheet are aligned, for example, by superimposing an outer layer at one side end and an inner layer at the other side end on each other, and at the upper surface of the center seal plate 50, for example, at a temperature of 145 ° C. at 145 ° C. by a heating member for a center seal. Heat sealing is performed for 3 seconds to obtain a cylindrical laminated sheet.

The tubular laminated sheet is then processed by the method shown in FIGS.
It is conveyed to the gusset processing part 36 as shown in FIG. Here, the tubular laminated sheet is conveyed such that only the pair of gusseted guide plates 35a and 35b are inserted into the tubular laminated sheet. The gusset processing plates 39a, 39b and the gusset folding auxiliary disks 38a, 38b are respectively brought into contact with the outer surface of the tubular laminated sheet, and the contacted portions are provided in the gap between the gusset processing guide plates 35a, 35b. Be folded.

The folded cylindrical laminated sheet is then
It is sent to the side seal portion 40, and the folded portion is heated and pressed at 55 ° C. for 0.3 seconds. This heating pressure contact is performed to fix the fold line of the folded portion, and is not to perform heat sealing. The heating is performed, for example, at a temperature 20 to 30 ° C. lower than the softening point of the laminated sheet.

Thereafter, the tubular laminated sheet is attached to the side cooling section 4
It is cooled at 1, and sent to the bottom seal part 42. Here, heat sealing is performed at 148 ° C. for 0.3 seconds perpendicular to the flow direction to form a bottom seal. Examples of the shape of the heat seal include a strip shape along the flow direction, a ship bottom type, and the like.

After heat sealing, the tubular laminated sheet is cooled in the bottom cooling section 43 and sent to the cutter 44, the bottom seal or the downstream side thereof is cut, and the packaging bag obtained from the take-out section 45 is recovered. .

An example of an apparatus for manufacturing a tubular packaging member is
Obtained by modifying the above-mentioned packaging bag manufacturing apparatus,
For example, the bottom seal part 42, the bottom cooling part 43, and the cutter 44 in FIGS. 13 and 14 may be omitted, and a take-up part for taking up the tubular laminated sheet may be further provided after the take-out part 45. .

In the packaging bag manufacturing apparatus and the tubular packaging member manufacturing apparatus of the present invention, at least one of the center seal guide plate and the gusseted guide plate may have lubricity on at least a part of its surface. preferable.

As in the present invention, when the outer layer and the inner layer are the same polyolefin, for example, one layer and the other layer are a combination of polyethylene and polyethylene, a combination of polypropylene and polypropylene, a combination of polypropylene and polyethylene, etc., In particular, the slipperiness of the inner layer having a low softening point may be poor, and the center seal guide plate, the gusseted guide plate, or the like may be caught, making the manufacture impossible. However, by imparting lubricity to at least one of the center seal guide plate and the gusseted guide plate, the flow of the laminated sheet in the entire manufacturing process becomes good, and low-cost mass production becomes possible.

It is preferable that the center seal guide plate and the gusseted plate are provided with a member having lubricity with a dynamic friction coefficient of 2 or less on at least a part of their surfaces. As a result, smoother transportation is performed.

The member having lubricity is a member made of a material having a low dynamic friction coefficient and / or a member having a shape having a low dynamic friction coefficient, such as Teflon (registered trademark), silicone, or fluororesin. Examples of the plate include a plate obtained by forming, rolling, or coating a material having a low dynamic friction coefficient, a plate having a corrugated surface, and a member having a convex shape on the surface such as a triangular prism. Such a member can be applied to desired positions on the surfaces of the center seal guide plate and the gusseted plate. The plate obtained by using Teflon, silicon, or fluororesin has a low dynamic friction coefficient,
An appropriate height difference is generated by the thickness of the plate, the contact area with the laminated sheet is reduced, and the friction resistance can be reduced, which promotes smooth conveyance. Further, the member having a convex portion on the surface, with respect to the surface of the center seal guide plate and the gusseted plate, the convex portion mainly contacts to reduce the contact area with the laminated sheet, so that the friction resistance can be reduced, Allows smooth transportation of laminated sheets.

FIG. 21 is a view showing an example of a center seal guide plate provided with a member made of a material having lubricity, FIG.
2 is a view showing an example of a gusseted guide plate provided with a member having lubricity.

The center seal guide plate 50 shown in FIG.
Has the same configuration as that of FIG. 15 except that a plate 51 made of Teflon obtained by forming and rolling Teflon, silicon, or fluororesin is provided. By using a Teflon plate having a low dynamic friction coefficient, the tubular laminated sheet is smoothly conveyed on the center seal guide plate 50. The dynamic friction coefficient at this time is about 1.5.

Gazette processing guide plate 35a shown in FIG.
17 has the same configuration as that of FIG. 17 except that a Teflon plate 52 similar to the Teflon plate 51 of FIG. 21, for example, is provided at the end portion in the longitudinal direction thereof where the laminated sheet is easily caught. A similar Teflon plate 52 can be provided on the gusseted guide plate 35b. As a result, the tubular laminated sheet is attached to the gusset guide plate 35a,
It is transported smoothly on 35b. The dynamic friction coefficient at this time is about 1.5.

FIG. 23 is a top view of an example of the center seal guide plate provided with a member for forming a convex shape on its surface, and FIG. 24 is a sectional view taken along line CC ′ of FIG.

As shown in the figure, in this example, a Teflon member 53 having a corrugated cross section obtained by molding and rolling silicon or Teflon resin having a corrugated surface is formed on the surface of the center seal guide plate 50. It is provided with the axial direction parallel to the flow direction, and a convex shape is formed on the surface of the center seal guide plate 50. Laminated sheet
On the Teflon-made member 53 having such a shape, the contact area mainly between the laminated sheet and the Teflon-made member 53 is smaller than the contact area between the Teflon-made plate having a flat surface. Therefore, the center seal guide plate 50
The frictional resistance with and decreases, and it can be transported smoothly again. The dynamic friction coefficient at this time is about 1.5.

FIG. 25 is a top view of an example of a gazette processing guide plate provided with a member for forming a convex shape, FIG. 26 is a sectional view taken along the line AA ′ of FIG. 25, and FIG. 26 is a sectional view taken along line BB ′ of 26.

As shown in the figure, in this example, a Teflon member 54 having a corrugated surface is provided in the central portion of the surfaces of the gazette processing guide plates 35a and 35b and the side end portions thereof so that the axial direction thereof is parallel to the flow direction. And the convex shape is formed on the gusset processing guide plates 35a and 35b.
The laminated sheet mainly contacts the convex portion on the Teflon member 54, and the contact area between the laminated sheet and the Teflon member 54 becomes very small. Therefore, it is preferable to provide a Teflon plate having a flat surface. Further, the frictional resistance with the Teflon-made member 54 is further reduced, and it can be conveyed smoothly. The dynamic friction coefficient at this time is about 1.5.

[0091]

According to the present invention, it is possible to obtain a high-quality and low-cost tubular packaging member and packaging bag that does not cause heat seal failure, seal breakage, breakage, or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a laminated sheet used in the present invention.

FIG. 2 is a cross-sectional view showing another example of the laminated sheet used in the present invention.

FIG. 3 is a diagram showing an example of a tubular packaging member that is directly heat-sealed.

FIG. 4 is a diagram showing another example of a tubular packaging member that is directly heat-sealed.

FIG. 5 is a diagram showing an example of a tubular packaging member that is indirectly heat-sealed.

FIG. 6 is a packaging bag formed by using each of the tubular packaging members shown in FIG.

7 is a packaging bag formed by using each of the tubular packaging members shown in FIG.

FIG. 8 is a packaging bag formed by using each of the tubular packaging members shown in FIG.

FIG. 9 is a view showing an example of a gusseted tubular packaging member.

FIG. 10 is a diagram showing an example of a gusseted packaging bag.

FIG. 11 is a view showing an example of a packaging bag in which a ship bottom type is heat-sealed.

FIG. 12 is a diagram showing an example of a box-in-box type container.

FIG. 13 is a view of an example of the packaging bag manufacturing apparatus of the present invention viewed from above.

FIG. 14 is a side view of FIG. 12 perpendicular to the flow direction.

FIG. 15 is a view of the center seal plate viewed from above.

16 is a side view of FIG. 15 viewed from a direction perpendicular to the flow direction.

FIG. 17 is a top view of the gusseted part.

FIG. 18 is a side view seen from the direction perpendicular to the flow direction.

19 is a cross-sectional view taken along line X-X ′ of FIG.

20 is a cross-sectional view taken along the line Y-Y ′ of FIG. 18.

FIG. 21 is a diagram showing an example of a center seal guide plate provided with a member having lubricity.

FIG. 22 is a view showing an example of a gusseted guide plate provided with a member having lubricity.

FIG. 23 is a top view of an example of a center seal guide plate provided with a member that forms a convex shape.

FIG. 24 is a cross-sectional view taken along the line C-C ′ of FIG. 23.

FIG. 25 is a view showing an example of a gazette processing guide plate provided with a member forming a convex shape, as seen from above.

26 is a cross-sectional view taken along the line A-A ′ of FIG. 25.

27 is a cross-sectional view taken along the line B-B ′ of FIG. 26.

[Explanation of symbols]

1, 3, 11, 15 ... Cylindrical packaging member, 2, 4, 5, 16
... Heat seal part, 7, 9, 13, 17, 20, 30 ... Packaging bag, 8, 10, 14, 18, 19, 42 ... Bottom seal part, 12 ... Gazette part, 21 ... First polyolefin layer, 22 ... second polyolefin layer, 23 ... laminated sheet, 33 ... center press part, 35a, 35b ... gazette processing guide plate, 36 ... gazette processing part, 38a, 38
b ... Gazette folding auxiliary disk, 39a, 39b ... Gazette processing plate, 42 ... Bottom seal heating part, 44 ... Cutter,
50 ... Center seal guide plate, 51, 52 ... Teflon plate, 53, 54 ... Teflon member forming convex shape

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 30/16 B65D 30/16 F 65/40 65/40 DF term (reference) 3E064 AA06 AA08 AA13 BA26 BA30 BB03 BC18 EA01 EA04 HN05 3E075 AA02 AA08 BA46 BA70 BB02 CA02 DA14 DA32 DB02 DB14 DD13 DD32.

Claims (20)

[Claims] 1. A planar laminated sheet including an inner layer made of a first polyolefin having a first softening point and an outer layer made of a second polyolefin having a second softening point higher than the first softening point. A tubular packaging member molded by heat-sealing. 2. The tubular packaging member according to claim 1, wherein the tubular packaging member is gusseted with a fold line in its axial direction. 3. A strip-shaped laminated sheet comprising an inner layer made of a first polyolefin having a first softening point and an outer layer made of a second polyolefin having a second softening point higher than the first softening point. A packaging bag formed by heat sealing using. 4. The packaging bag according to claim 3, wherein the side end portion is gusseted. 5. A strip-shaped laminated sheet including an inner layer made of a first polyolefin having a first softening point and an outer layer made of a second polyolefin having a second softening point higher than the first softening point. While being conveyed in the longitudinal direction, it is introduced onto a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and both longitudinal end portions of the strip-shaped laminated sheet are bent along the center seal guide plate and bent. A method for manufacturing a tubular packaging member, comprising the step of aligning one longitudinal end and the other longitudinal end of the strip-shaped laminated sheet with each other and performing heat sealing to mold the tubular laminated sheet. 6. The method for manufacturing a tubular packaging member according to claim 5, wherein at least a part of the surface of the center seal guide plate has lubricity. 7. After the step of molding the tubular laminated sheet, the tubular laminated sheet has a width narrower than the width of the center seal guide plate, is opposed to each other at intervals, and is spaced from each other. And a pair of gusseted guide plates arranged to face each other, and in the vicinity of both end portions between the gusseted guide plates,
Each of them is introduced into a gusseted part having a pair of gusseted plates arranged so as to extend partly inside the side end part and the other part outside the side end part. The pair of gusset guide plates are passed through the inside of the tubular laminated sheet, and the pair of gusset processed plates are abutted from the outer surface of the tubular laminated sheet, and the abutted portion of the tubular laminated sheet is attached to the gusset. The method further comprises the step of forming a gusseted tubular laminated sheet by folding the tubular laminated sheet into the gap between the guide plates and pressing the folded tubular laminated sheet against the gusset guide plate surface in a direction perpendicular to the gusset guide plate surface. The method for manufacturing the tubular packaging member according to claim 5 or 6. 8. The method for manufacturing the tubular packaging member according to claim 7, wherein at least a part of the surface of the gusset guide plate has lubricity. 9. A strip-shaped laminated sheet comprising an inner layer made of a first polyolefin having a first softening point and an outer layer made of a second polyolefin having a second softening point higher than the first softening point. While being conveyed in the longitudinal direction, it is introduced onto a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and both longitudinal end portions of the strip-shaped laminated sheet are bent along the center seal guide plate and bent. A process of aligning one longitudinal end of the strip-shaped laminated sheet and the other longitudinal end of the strip-shaped laminated sheet and heat-sealing them to form a tubular laminated sheet, and heat-sealing the tubular laminated sheet in the width direction. A method of manufacturing a packaging bag, comprising a step of molding a bottom portion. 10. The method of manufacturing a packaging bag according to claim 9, wherein the center seal guide plate has lubricity on at least a part of its surface. 11. After the step of molding the tubular laminated sheet, the tubular laminated sheet is provided with a pair of gusseted guide plates arranged to face each other with a gap, and both side ends between the gusseted guide plates. Introduced into a gusseted portion having a pair of gusseted plates arranged so as to extend in the vicinity of the respective portions, one portion being inside the side end portion and the other portion being outwardly extending from the side end portion. Then, the pair of gusset guide plates are passed through the inside of the tubular laminated sheet, and the pair of gusset processed plates are abutted from the outer surface of the tubular laminated sheet, and the tubular laminated sheet of the abutted portion Further comprising a step of forming a gusset-processed tubular laminated sheet by folding the tubular laminated sheet into a gap between the gusset guide plates and pressing the folded tubular laminated sheet from a direction perpendicular to the gusset guide plate surface. Characterized by Method for producing a packaging bag according to claim 9 or 10. 12. The method of manufacturing a packaging bag according to claim 11, wherein the gusset guide plate has lubricity on at least a part of its surface. 13. A strip-shaped laminated sheet supply section for feeding the strip-shaped laminated sheet, a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and both longitudinal ends thereof bent along the center seal guide plate. A tubular packaging member, comprising: a center seal heating member for heat-sealing one longitudinal end portion and the other longitudinal end portion of the strip-shaped laminated sheet formed to form a tubular laminated sheet. Manufacturing equipment. 14. The tubular packaging member manufacturing apparatus according to claim 13, wherein at least a part of the surface of the center seal guide plate has lubricity. 15. A pair of gusseting guide plates, which have a width narrower than that of the center seal guide plate and are arranged to face each other with a gap, in the latter stage of the heating member for center seal, and the gusseting process. A pair of gusseted plates disposed so as to extend in the vicinity of both side end portions between the guide plates, each part extending inward from the side end portion and the other part extending outward from the side end portion. The apparatus for manufacturing a tubular packaging member according to claim 13 or 14, further comprising a gusseted portion having the gusseted portion. 16. The apparatus for manufacturing a tubular packaging member according to claim 15, wherein at least a part of the surface of the gusset guide plate has lubricity. 17. A strip-shaped laminated sheet supply section for feeding the strip-shaped laminated sheet, a center seal guide plate having a width narrower than the width of the strip-shaped laminated sheet, and both longitudinal ends thereof bent along the center seal guide plate. A center-seal heating unit for heat-sealing one longitudinal end and the other longitudinal end of the strip-shaped laminated sheet to form a tubular laminated sheet, and the tubular laminated sheet is heat-sealed in the width direction. An apparatus for manufacturing a packaging bag, comprising: 18. The packaging bag manufacturing apparatus according to claim 17, wherein at least a part of the surface of the center seal guide plate has lubricity. 19. A pair of gazette processings having a width narrower than the width of the center seal guide plate between the center seal heating member and the bottom seal heating portion and being arranged to face each other with a space therebetween. The guide plate and the gusseted guide plate are arranged in the vicinity of both side end portions of the guide plate, with some of the portions extending inward of the side end portions and other portions extending outward of the side end portions. The packaging bag manufacturing apparatus according to claim 17 or 18, further comprising a gusseted portion having a pair of gusseted plates. 20. The packaging bag manufacturing apparatus according to claim 19, wherein the gusseted guide plate has lubricity on at least a part of its surface.