JP2001213442A - Non-tray packaging bag and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-tray packaging bag and its industrial manufacturing method, capable of achieving such purposes that (a) no tray is used, thereby making the incineration of a packaging bag easier when it is made to waste, the weight and capacity of a packaging material are reduced, and the inclusion of the different kinds of plastics materials is avoided as much as possible, (b) bulky contents are prevented from being irregularly positioned in the bag, and (c) a package is prevented from buckling when displayed. SOLUTION: The non-tray packaging bag (1) packages contents without using a tray. The bag (1) is formed of front and rear sheets (S), (S) and has a basic structure in which one side of the bag forms an opening side (11) while the other sides thereof form sealed sides (12), respectively. Rib-like sealing belts (2) for welding both the front and the rear sheets (S), (S) to each other are so formed as to project in the form of the teeth of a comb toward the central region of the bag from at least one side among the sealed sides (12).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-tray packaging bag suitable for packaging contents (for example, bulky and lightweight ones such as dry matter) without a tray, and an industrial production method thereof. It is.

[0002]

2. Description of the Related Art Dried shiitake mushrooms, dried seafood, dried seaweeds, and other light and dry foods with a certain bulk are filled in ordinary bags in a tray and packed. It is usually distributed and displayed at stores.

[0003] Recently, there has been an attempt to eliminate the tray for the purpose of reducing the amount of waste packaging material. For example, packaging of fruits and vegetables is becoming a non-tray as a three-dimensional package by devising a seal of a packaging film. At this time, the bottom of the bag has a boat shape or a circular bottom.

[0004]

The packaging using the tray is costly for the amount of the tray, is disadvantageous in weight, and burdens the disposal process such as incineration. In addition, the material of the bag and the material of the tray are generally different from each other. However, considering the incineration treatment, there is a situation that the bag and the tray should be made of different materials as much as possible.

At present, it is essential to reduce the weight of the packaging material and to select a material which can be easily incinerated as the packaging material. Therefore, it is strongly desired to use a packaging bag without a tray.

However, in the case of a package without trays, if the contents are bulky and light, such as dry matter, the contents may be biased in the bag or the bag may break at the time of display, so that it may be used in stores. It is inevitable that the display will be inferior.

Under such a background, the present invention provides:
(a) Avoiding the use of trays to facilitate incineration at the time of disposal, reducing the weight and volume of packaging materials, minimizing the mixing of different types of plastics, and (b) bulky contents To provide a non-tray packaging bag which solves the problems such as preventing objects from being unevenly distributed in the bag, (c) preventing the package from breaking at the time of display, and the like. It is an object of the present invention to provide an industrial production method of non-tray packaging bags.

[0008]

A non-tray packaging bag according to the present invention is a non-tray packaging bag (1) for packing contents without a tray, and the bag (1) has front and back sides. Sheet of
(S), having a basic structure in which one side becomes an opening side (11) and the other side becomes a sealing side (12), and the sealing side (12) A rib-shaped sealing band (2) for fusing the front and back sheets (S), (S) so as to protrude in a comb shape from at least one side of It is characterized by having.

In the method of manufacturing a non-tray packaging bag according to the present invention, the raw sheet (S ') unwound from the raw material supply roll is cut in half, and each of the cut sheets (S), (S) is sent downstream. Step A, with the upper and lower half-sheets (S), (S) overlapped, heat-seal in the sheet advancing direction in the center line area and the both ear end side areas, and the center line heat seal band (3) B, forming heat-seal strips (4), (4) on both ends, and heat-sealing in the sheet width direction to form a heat-seal strip (5) in the width direction. From the heat seal band (3), the ear end side heat seal band (4) or the width direction heat seal band (5), face the front and back so that they protrude in a comb shape toward the area surrounded by these heat seal bands. Sheet of
Step D of forming a rib-shaped sealing band (2) for fusing (S), (S) by heat sealing, cutting along the center line of the band of the center line heat sealing band (3), Step E of separating into rows, cutting in the sheet width direction along a line slightly deviating from the width direction heat sealing band (5), Step F forming individual bags, downstream of the bags separated in the previous step F The process of deriving the process G is performed in this order or in any order of the processes B, C, and D.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

<< Non-tray packaging bag >>
The tray packaging bag consists of a non-tray packaging bag (1) that packs the contents without a tray.

<Basic structure> This bag (1) is
It has a basic structure formed of (S) and (S), one side being an open side (11) and the other side being a sealed side (12). bag
The shape of (1) is usually a rectangle, but a shape in which a corner of the bag is cut or sealed diagonally can also be used. The sealing side (12) is often formed by heat sealing, but for some of the sealing sides (12), the folded side of the sheet (S) can be used as it is. The contents are filled from the open side (11) of the bag (1), and the open side (11)
Is sealed to form a package. The bag (1) may be of a structure which can be suspended depending on the case.

<Sheet (S)> As the sheet (S), typically, a laminated film composed of a base film / sealant layer is suitably used. In addition, ethylene content is 20 ~
60 mol% ethylene-vinyl alcohol copolymer, acrylonitrile-based acrylonitrile-based polymer,
A layer having gas barrier properties such as a metal vapor deposition layer may be included, and a layer of metal foil, paper, nonwoven fabric, or the like may be included instead of or together with the base film. However, in general, it is often sufficient to have a moisture-proof property, and thus a laminated film composed of a base film and a sealant layer is often used.

The base film in the laminated film composed of the base film / sealant layer includes a biaxially oriented polypropylene film (OPP), a biaxially oriented nylon film (ONy), and a biaxially oriented polyester film (PE
T), a non-stretched polypropylene film, a non-stretched nylon film, and the like. As the sealant layer, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDP)
E), high-density polyethylene (HDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylate copolymer, ionomer, polyethylene-based resin such as ethylene-propylene copolymer, and polypropylene called CPP Examples of the layer include various resin layers having heat sealing properties, such as a base resin. Among these, considering incineration treatment after disposal, it is particularly important that the base film is a biaxially oriented polypropylene film and the sealant layer is a polyolefin such as CPP.

The lamination of the base film and the sealant layer is as follows:
Dry lamination, wet lamination, co-extrusion, extrusion coating, etc.,
In particular, a dry lamination method is often used. On the inner surface side and / or the outer surface side (particularly the inner surface side) of the base film, pattern printing and / or solid printing can be performed in advance.

<Rib seal band (2)> As described above, the bag
(1) has a basic structure in which front and back sheets (S) and (S) are formed and one side is an opening side (11) and the remaining side is a sealing side (12). A rib-like shape for fusing the front and back sheets (S), (S) such that at least one of the sealing sides (12) protrudes in a comb shape toward the central region of the bag. A sealing band (2) is formed. This is a characteristic feature of the present invention.

A rib-shaped sealing band protruding from the sealing side (12)
The length L of (2) is 3 to 30%, preferably 5 to 30%, and more preferably 10 to 2% of the length Lo between the sealing side (12) and the opposite side.
It is desirable to set it to 5%. In the case of a bag of a very standard size having a Lo of about 200 mm, the length L of the rib-shaped sealing band (2) is often, for example, about 15 to 50 mm, especially about 20 to 45 mm. If the length is too short, the effect of the partition wall installation is poor, while if the length is too long, the space for accommodating the contents is reduced.

A rib-shaped seal band protruding from the sealing side (12)
The width and number of (2) depends on the size of the bag (1), but the width is about 2 to 20 mm (particularly about 3 to 15 mm), and the number is 1 per side of the sealing side (12). It is often about 5 to 5 (especially about 2 to 4). However, when forming a thin intermittent line like a perforation, the width can be reduced to about 1 mm, or the number can be much larger than the above.

When the number of the rib-shaped seal strips (2) is plural, the size and the contents of the bag (1) are set, although the interval between the adjacent rib-shaped seal strips (2), (2) is appropriately determined. Although it depends on the size of the object, it is about 15 to 100 mm (particularly, 20 to 70 mm
Degree).

A plurality of rib-shaped sealing strips from the sealing side (12)
When (2) is made to project, the length, shape, interval, etc. of each rib-shaped sealing strip (2) may be different.

The shape of the rib-shaped seal band (2) is usually a straight line, an intermittent line, or a deformed shape thereof. FIGS. 5A to 5G show some examples of the shape of the rib-shaped sealing band (2) in the case where the number of the rib-shaped sealing bands is two per bag.

The rib-shaped sealing strips (2) are often formed so as to project at right angles from the sealing side (12). It can be tilted.

<Ingenuity on Opening Side at the Time of Use> On the side serving as the opening of the bag (not necessarily the side of the opening side (11)), the opening during use at the stage of reaching consumers. Notches, perforations, tapes, etc. can be provided to facilitate Further, a fitting-type zipper can be provided so that resealing after opening is possible.

<Contents> Dried shiitake mushroom, dried jellyfish,
Dried gourds, dried seafood, dried shrimp, dried seaweeds, grilled laver, Takano tofu, delicacies, instant foods (noodles, solid ingredients, solid porridge, solid soups, etc.), bread, snacks, dried radish and other foods And medicines such as Chinese herbal medicines, but various non-foods such as dried water moss, insect specimens, and miscellaneous goods may be used. The contents are often, but not limited to, dried or lightweight, and a wide variety of contents can be packaged.

<< Production Method of Non-Tray Packaging Bag >> The non-tray packaging bag of the present invention can be produced by any method as long as it has the above specific structure. However, in view of the industrial continuous bag-making process, it is particularly desirable to produce the resin by the method described below. The packaging bag manufactured by the following process is an example of a case where two bags are taken on the left and right in the sheet width direction (in the case of two catches).

<Step A> Step A is a step in which the raw sheet (S ') fed from the raw sheet supply roll is cut in half, and each of the cut sheets (S), (S) is sent downstream. Raw sheet (S ')
Is supplied at a constant speed in this step A in order to keep the tension constant, but is buffered in the step A, and after the next step B, the half-cut sheets (S) and (S) are typically separated into individual bags. The intermittent running is performed with one pitch for one bag as one pitch.

<Step B> Step B consists of upper and lower half-cut sheets
In the state where (S) and (S) are superimposed, heat seal is performed in the sheet advancing direction on the center line area and the binaural end side area, and the center line heat sealing band (3) and the binaural end side heat seal are performed. This is a step of forming bands (4) and (4). Since the center line heat seal band (3) is cut along the center line in the subsequent step E, the width is twice as large as the peripheral seal band when it is made into individual bags.

<Step C> Step C is a step in which heat sealing is performed in the sheet width direction to form a width-direction heat seal band (5). In order to complete the seal, the heat melting operation by the sealer can be performed in multiple stages.

<Step D> In the step D, the center line heat seal band (3), the ear end side heat seal band (4) or the widthwise heat seal band (5) is surrounded by these heat seal bands. This is a step of forming a rib-shaped seal band (2) for fusing the front and back sheets (S), (S) by heat sealing so as to protrude in a comb-like shape toward the set area. At this time, the rib-shaped sealing band (2) may extend from the widthwise heat sealing band (5) in one of the front and rear directions in the sheet traveling direction as shown in a step D in FIG. In many cases, as in step D, the center line heat seal band (3) is extended in both directions in the sheet width direction.
(4) Overhang or heat-seal strip in the width direction
It is also possible to project from (5) in two directions before and after the seat running direction, or to project from two or more of the seal strips (2), (3) and (4).

<Step E> Step E is a step of cutting along the center line of the band of the center line heat sealing band (3) and cutting it into left and right bag rows. This step E is performed, for example, by applying a cutter blade from above the running sheet. In this step E, the left and right bag rows are separated, but the left and right bag rows are still in a state where bags are continuously provided in the front-rear direction (the sheet traveling direction). In this step E, trimming of both ears of the sheet can be performed at the same time as in step E of FIG. 2 described later.

<Step F> Step F is a step in which the sheet is cut in the sheet width direction along a line slightly deviating from the width direction heat seal band (5) to form individual bags. The cutting at this time is performed by, for example, a guillotine type cutter.

<Step G> Step G is a step in which the bags separated in the previous step F are led out downstream. The derived bag is
It is counted and stored in a case or the like.

<Modification of Step> As described above, the method of the above-described steps A to G is merely an example of a practical method, and various other modifications are possible. For example, in the process A, a half-folded sheet that is not cut in half is used as it is,
It is also possible to use two independent original sheets. The formation of the sealing strips (3), (4), (5) and (2) in the steps B, C and D (especially the formation of the sealing strips (5) and (2) in the steps C and D) may be performed in any order. Or the formation of two or more types of seal strips can be performed simultaneously. The cut in the step E can be performed along a line slightly deviated from the center line heat seal band (3), and the cut in the step F can be performed along the center line of the widthwise heat seal band (5). The widthwise heat-sealing band (5) in the step C may be formed in a deformed shape without forming a straight line, and a shape in which corners of the bag are cut or sealed diagonally when individual bags are formed. . Alternatively, instead of taking two bags in the width direction of the sheet as described above, taking one, three,
It is also possible to use four-claw. If necessary, a cosmetic cutting for adjusting the shape of the bag can be performed using a punching blade before or after the step E or F.

[0034]

The present invention will be further described with reference to the following examples.

Embodiment 1 FIG. 1 is a front view showing an example of a non-tray packaging bag of the present invention. FIG. 2 is an explanatory view showing an example of a method of manufacturing the non-tray packaging bag of FIG.

A thickness of 40 μm as an example of the base film
Long OPP (biaxially oriented polypropylene film)
And a long CPP (polypropylene resin film) having a thickness of 20 μm as an example of the sealant layer. Printing was performed on the inner surface side of the base film in advance. The base film was dry-laminated with a sealant layer to obtain a raw sheet (S ′). The reason for using a thicker OPP is to get a firmer back. As the CPP, an antistatic grade or the like can be used as necessary.

Using the raw sheet (S '), bag making was performed according to the following steps.

First, in step A, the raw sheet
The sheet (S ′) was set on a sheet supply roll, and the sheet (S ′) fed out therefrom was cut in half (cut into half widths), and the cut sheets (S) and (S) were sent downstream. The raw sheet
(S ') is supplied at a constant speed in this step A in order to keep the tension constant, but is buffered in the step A, and after the next step B, one sheet of the individual bag is used as one sheet. The pitch was intermittently run. (See (A) in Fig. 2)

In step B, the upper and lower half sheets (S),
With the (S) superimposed, heat seal is performed in the sheet advancing direction on the center line area and both ear end areas using a sealer, and the center line heat seal band (3) and both ear end heat seals are applied. Bands (4) and (4) were formed into three seal bands. The width of the center line heat seal band (3) is 14 mm, and the width of both ear end side heat seal bands (4) and (4) is 10 mm and 10 mm, respectively.
It was made to become. (See (b) in Fig. 2)

In step C, the sheet was heat-sealed in the sheet width direction using a sealer to form a width-direction heat seal band (5). The width of the width direction heat seal zone (5) is
It was set to 7 mm . (See (c) in FIG. 2)

In the step D, the center line heat seal band (3), the ear end side heat seal band (4) and the width direction heat seal band are removed from the width direction heat seal band (5).
(5) The front and back sheets (S), (S) are fused so that they protrude in a comb-teeth shape toward the area surrounded by (in this example, the front of the front and back of the sheet traveling direction). Rib-shaped seal strip
(2) was formed by heat sealing. (See (d) in Fig. 2)

In the process E, a cutter blade is applied from above the running sheet to cut along the center line of the center line heat seal band (3), and cut into left and right bag rows (these are cut off). After that, the bags are continuously provided before and after in the sheet advancing direction). At this time, trimming of 3 mm width at both ends of the sheet was also performed. (See (e) in FIG. 2)

In step F, using a guillotine-type cutter, along a line slightly deviating from the widthwise heat seal band (5) (in this example, the rear side in the sheet advancing direction as viewed from the seal band (5)). The sheet was cut in the width direction (along the line slightly deviated from the above) to form individual bags. (See (f) in FIG. 2)

In the process G, the bags separated in the preceding process F were led out downstream, and the drawn-out bags were counted manually and stored in a case. (See (g) in Fig. 2)

As a result, a non-tray packaging bag composed of the bag (1) shown in FIG. 1 was obtained. The dimensions of each part are shown in FIG.

In this bag (1), one side (upper side in FIG. 1) is an opening side (11), and the other side is a sealing side (12). The bottom side in FIG. 1 of the sealing side (12) is constituted by a widthwise heat seal band (5) at the time of bag making. One of the side edges in FIG. 1 is constituted by half of the center line heat seal band (3) at the time of bag making, and the other is constituted by the ear end side heat seal band (4) at the time of bag manufacture.

Then, the front and back sheets (the back and forth sheets (12) are protruded from the sealing side (widthwise heat sealing band (5)) which is the bottom side in FIG. S), (S)
Are formed, two linear rib-shaped seal strips (2) for fusing are formed.

After filling the bag (1) shown in FIG. 1 with 15 to 30 g of dried shiitake mushrooms as an example of the contents, the bag (1) was opened.
1) Heat sealed the side to make a package, subjected to a process that simulates distribution, and performed a display test. Despite the packaging without a tray, bulky and lightweight contents (dried shiitake mushrooms)
And the package is prevented from breaking at the time of display.

Embodiment 2 FIG. 3 is a front view showing another example of the non-tray packaging bag of the present invention. FIG. 4 is an explanatory view showing an example of a method of manufacturing the non-tray packaging bag of FIG.

In the second embodiment, the process D in the first embodiment is changed as follows. That is, in the process D, the region surrounded by the center line heat seal band (3), the center line heat seal band (3), the ear end side heat seal band (4) and the width direction heat seal band (5) is formed. Rib-shaped sealing strips that fuse the front and back sheets (S), (S) so that they protrude in a comb-like shape (toward both sides in the sheet width direction in this example)
(2) was formed by heat sealing. (See (d) in FIG. 4)

Thus, a non-tray packaging bag composed of the bag (1) shown in FIG. 3 was obtained. The dimensions of each part are shown in FIG.

In this bag (1), one side (the right side in FIG. 3) is an opening side (11), and the other side is a sealing side (12). The bottom side of FIG. 3 of the sealing side (12) is constituted by half of the center line heat sealing band (3) at the time of bag making. One side of FIG. 3 is composed of a width-wise heat seal band (5) during bag making, and the upper side of FIG. 3 is an ear end side heat seal band (4) during bag making.
It is composed of

Then, of the sealing side (12), the sealing side (half of the center line heat seal band (3)) which is the bottom side of FIG. Sheet
(S), two straight rib-shaped sealing strips (2) for fusing (S)
The book is formed.

After filling 15 to 20 g of dried shiitake mushrooms as an example of the contents in the bag (1) shown in FIG.
1) Heat sealed the side to make a package, subjected to a process that simulates distribution, and performed a display test. Despite the packaging without a tray, bulky and lightweight contents (dried shiitake mushrooms)
And the package is prevented from breaking at the time of display.

[0055]

According to the present invention, the following excellent effects can be obtained. (a) Since no tray is used, the only packaging material is bags. Therefore, incineration at the time of disposal becomes easy, the weight and volume of the packaging material can be reduced, and the mixing of plastics of different materials can be avoided as much as possible. (b) Uneven distribution of bulky contents in a bag can be effectively prevented. (c) Since the rigidity is increased by the rib-shaped seal band (2), it is possible to prevent the package from breaking at the time of display. (d) The packaging bag can be obtained by devising only the heat seal, which is advantageous in terms of manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a non-tray packaging bag of the present invention.

FIG. 2 is an explanatory view showing an example of a method of manufacturing the non-tray packaging bag of FIG.

FIG. 3 is a front view showing another example of the non-tray packaging bag of the present invention.

FIG. 4 is an explanatory view showing an example of a method of manufacturing the non-tray packaging bag of FIG.

FIG. 5 is an explanatory view showing an example of the shape of a rib-shaped seal band (2).

[Explanation of symbols]

(S '): raw sheet, (S): sheet, half-cut sheet, (1) ...
Bag, (11) ... open side, (12) ... sealing side, (2) ... rib-shaped seal band, (3) ... center line heat seal band, (4) ... ear end side heat seal band, (5) … Width direction heat seal zone

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E064 AA05 BC18 EA07 EA30 HF09 HG03 3E075 AA12 BA42 BB08 BB21 CA02 DB13 DB14 DD11 DD45 DD46 DE21 GA04 GA05

Claims (3)

[Claims] 1. A non-tray packaging bag (1) for packaging contents without a tray, wherein the bag (1) is formed from front and back sheets (S), (S).
That the side has the basic structure in which the side is the opening side (11) and the remaining side is the sealing side (12); from at least one side of the sealing side (12),
Non-tray packaging characterized by forming a rib-shaped sealing band (2) for fusing the front and back sheets (S), (S) so as to protrude in a comb shape toward the central region of the bag. For bags. 2. The length L of the rib-shaped sealing strip (2) extending from the sealing side (12) is 3 to 3 times the length Lo between the sealing side (12) and the opposing side. The non-tray packaging bag according to claim 1, which is 30%. 3. An original sheet unwound from an original supply roll.
(S ') is cut in half, and the half cut sheets (S) and (S) are sent downstream in step A. In the state where the upper and lower half sheets (S) and (S) are superimposed,
Step B of performing heat sealing in the sheet advancing direction on the center line region and the binaural end side region to form a center line heat seal band (3) and binaural end side heat seal bands (4) and (4). Heat sealing in the sheet width direction to form a width direction heat seal band (5), the center line heat seal band (3), the edge end side heat seal band (4) or the width direction heat seal band From (5), heat the rib-shaped seal strip (2) for fusing the front and back sheets (S), (S) so that they protrude in a comb shape toward the area surrounded by these heat seal strips. Step D of forming a seal, cutting along the center line of the center line heat-seal band (3), and cutting into left and right bag rows E, a line slightly deviated from the widthwise heat-seal band (5) Cut in the sheet width direction along the way to make individual bags, Step F A method for producing a non-tray packaging bag, wherein each step of the step G to be introduced into a flow is performed in this order or in any order for the steps B, C and D.