JP2004182267A - Packaging bag for business use and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for forming an easily unsealable portion on a packaging bag for business use with a large capacity (1 to 10 kg), in particular a heat-shrinkable pillow-packaging bag for use of flower paste, jam and bean jam products; a method for easily unsealing the bag without using an unsealing tool such as scissors; and the means inexpensively produced by using an existing filling machine. <P>SOLUTION: The heat-shrinkable pillow package 100 is made by an existing continuously pillow-filling machine for example. After the packaging bag is filled with viscous food, an upper lateral seal 10a is heat-sealed for hermetically sealing. A notch 10d for easily unsealing is cut by a cutter at the same time as separating. The packaging bag is exposed to a heat source such as steam in a subsequent process to have a heat-shrinkable plastic film shrunk to be completed. By limiting the shape of the packaging bag, the width of the lateral seal 10a, and a position and the cut depth of the notch 10d, the viscous food in a large capacity for business use can be easily and completely unsealed without using the unsealing tool such as scissors. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

＊ １；シュリンク処理後の長辺長／シュリンク処理前の長辺長×１００で計算されたフィルム変化率（％）
＊ ２；＊１同様で短辺長の変化率（％）
＊ ３；包装袋１０本を地上１ｍの位置から５回自然落下させ、破袋した包装袋の本数
＊ ４；１０本の包装袋を開封する時、内容物が付着し、フィルムをもつ手がすべる為、手指の洗浄を行った回数。回数が少ないことは連続して開封できたこと、即ち開封し易さを意味する。
＊ ５；１０本の包装袋の内、完全に下まで開裂が進行した数／全処理本数×１００（％）
＊ ６；茨城−大阪間を宅配便で往復した時の、内容物の状態（流通試験）
○は流通前と遜色ない、△は流通前と変化あるも品質に異常なく、製品として販売できる、×は流通前と外観に著しく変化（離水）があり、製品として販売できない。
【００４０】
表１の結果から明らかなように、実施例１、２の完全開封率は比較例に比べ顕著に良好で、実施例３についても良いことが判る。これは二軸延伸ナイロンフィルムが、収縮率の相違により長辺（縦）方向に引裂きが定まったことを表している。又、比較例３で判るように縦横の長さの比率が１．５倍以下である時はシュリンクが縦横同様に起こり、結果的に引裂き方向が定まらず完全開封がなされない。更に、比較例２から判るようにシュリンクフィルムであってもシュリンク工程を除くと引裂き方向が定まらない。つまり二軸延伸シュリンクフィルムを縦横に収縮率を違えてシュリンクさせることで、初めて引裂き方向が定まったことが明らかになった。
【００４１】
【実施例４】
実施例１の作成工程の内、横シール幅のみ１０ｍｍに変更した。
【００４２】
【実施例５】
実施例２の作成工程の内、シール幅を１５ｍｍに変更した。
【００４３】
【比較例４】
実施例１の作成工程の内、シール幅を５ｍｍのみ変更した。
【００４４】
【表２】シール幅の検討

【００４５】
表２、比較例４の結果から明らかなように、シール幅が５ｍｍであると、包材、シュリンクの有無に関らず完全開封率が著しく低下することが判り、本発明では横シール幅は１０ｍｍ以上必要であり、望ましくは１５ｍｍ以上であることが明白である。これは、シール幅が狭すぎると、ノッチが設けられているにも関らず、内容物が付着した手ではシール部を持ち引裂く力が上手く伝達されない為である。結果的に何度も手を拭く作業も加わり、作業性は逆に低下した。
【００４６】
【実施例６】
実施例１の作成工程の内ノッチ切れ込み深さのみ３ｍｍに変更した。
【００４７】
【実施例７】
実施例１の作成工程の内ノッチ切れ込み深さのみ５ｍｍに変更した。
【００４８】
【比較例５】
実施例１の作成工程の内ノッチ切れ込み深さを１ｍｍに変更した。
【表３】ノッチ深さの検討

【００４９】
表３、比較例５の結果から明らかなように、ノッチの切り込み深さが１ｍｍであると実施例６、７の範囲３ｍｍ以上に比べ完全開封率が著しく低下した。これは図６のノッチ形成刃が短すぎると、きれいにノッチが切り込めないことも有り開封率低下の一因となった。更に切り込みが上手く形成されても、引裂き応力が上手く伝達されない為、横方向にスタートから引裂きが起こってしまったことによる。さらに、必要以上に開封に力を要し、作業性改善を充分満たしていない。
【００５０】
【実施例８】
実施例１のノッチ位置のみ中心（縦シール部）から２０ｍｍに変更した。
【００５１】
【実施例９】
実施例２の作成工程の内、ノッチ位置のみ中心（縦シール部）から位置を７０ｍｍに変更した。
【００５２】
【比較例６】
実施例１の作成工程の内、ノッチ位置のみ中心（縦シール部）から位置を７５ｍｍに変更した。
【００５３】
【比較例７】
実施例１の作成工程の内、ノッチ位置のみ中心（縦シール部）から位置を１０ｍｍに変更した。
【００５４】
【表４】ノッチ位置の検討

【００５５】
表４の結果から明らかなように、ノッチ形成位置が、中心（縦シール部）から比較例６、７にあるよう７５ｍｍ、１０ｍｍである場合は完全開封率が著しく実施例に比べ低下している。これは１０ｍｍの場合は内部製品により引裂きが中断し、更に力を加えると、横方向に開裂する傾向が強かった。また、７５ｍｍと遠い位置にあると、横に近い為、引裂き直後のブレで横方向に引裂きが進む為、完全開裂が起こらないことが多く見られた。
【００５６】
【発明の効果】
本発明によれば、二軸延伸ポリアミドを最外層に配置し、内容物の内層がポリオレフィン系、ポリエステル系、ポリアミドからなる群より選ばれる少なくとも１種以上である積層シュリンクフィルムに特定の形状（比率）で充填、加熱収縮工程を受けた業務用粘稠性食品の開封が、特定位置に特定形状のノッチを設けることで、ナイフやカッター、鋏等の開封器具を使用することなく、完全に開封することを可能にし、その結果内容物を簡単に取り出す為のより広い開封口を確保することができる。既存の充填機のカッター及びその押さえ板を変更するだけで良く、別装置、別制御を伴わない為、安価に生産性良く提供することができ、無論流通時に破袋することなく、取引先である製パン業界の開封作業性改善に大きく貢献できる。
【図面の簡単な説明】
【図１】は本発明に係る包装袋の平面図。
【図２】は熱収縮性プラスチックフィルムの積層の拡大断面図。
【図３】は縦シール部の一部拡大断面図。
【図４】は本発明に係るノッチの形状及びその位置を示した拡大図。
【図５】は本発明に係るノッチの形成方法の一例を示す一部拡大図。
【図６】は本発明に係る包装袋を製造する工程を示す一部拡大図。
【符号の説明】
１００・包装袋
１０ａ・横シール部
１０ｂ・横シール部
１０ｃ・縦シール部
１０ｄ・ノッチ
１０ｅ・ノッチ
Ｌ１・・長辺
Ｌ２・・短辺
Ｌ３・・横シールの長さ
Ｌ４・・ノッチの深さ
Ｌ５・・ノッチの先端から内容物までの距離
Ｌ６・・切断前の横シールの長さ
Ｌ７・・切断後の横シールの長さ
Ｌ８・・切断後の横シールの長さ
Ｌ９・・カッター収納部及びスリットの長さ
Ｌ１０・ノッチ刃収納部及びスリットの幅
Ｌ１１・ノッチ形成刃の長さ
Ｌ１２・ノッチ深さ
２００・熱収縮性プラスチックフィルムの積層断面
２０・・基材の二軸延伸ポリアミド
２０ａ・基材部
２０ｂ・シーラント層の断面
２０ｃ・ヒートシールした縦シール断面
２０ｄ・縦シール接着面
２１・・接着剤層
２２・・無延伸ポリエチレン
２３・・シーラントの直鎖状低密度ポリエチレン
３００・熱収縮性プラスチックフィルムの縦シール接着断面
３０・・連続充填機で製袋された袋の横及び縦シール
３０ａ・縦シール部
３０ｂ・切断前の横シール部
４００・ノッチの形状及びその位置を示した拡大図
４０・・押さえ板
４０ａ・押さえ板上部
４０ｂ・押さえ板下部
４０ｃ・カッター収納部及び可動用スリット
４０ｄ・ノッチ形成刃収納及び可動用スリット
４０ｅ・ノッチ形成刃収納及び可動用スリット
４０Ｘ・ノッチ形成刃移動方向
５００・ノッチの形成方法の一例を示す一部拡大図
５０・・横シール部切断用カッター及びノッチ形成刃
５０ａ・カッター刃先
５０ｂ・ノッチ形成刃先
５０ｃ・ノッチ形成刃
６００・包装袋を製造する工程の概略図
６０・・押さえ板
６０ａ・ノッチ形成刃収納及び可動用スリット
６０ｂ・ノッチ形成刃収納及び可動用スリット
６０Ｘ・ノッチ形成刃移動方向
７０・・本発明により連続して製造された一方の包装袋の一部
７０ａ・横シール部
７０ｂ・ノッチ
７０ｃ・縦シール部
８０・・本発明により連続して製造された他方の包装袋の一部
８０ａ・横シール部
８０ｂ・ノッチ
８０ｃ・縦シール部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bag for packaging a food such as a flower paste, jam, bean jam or the like, which is a viscous material, using a heat-shrinkable plastic film (hereinafter, referred to as a shrink film), and a method for producing the same. The present invention relates to a business-use packaging bag, characterized in that a notch for facilitating opening of a bag is provided at a specific location in a horizontal seal portion at a specific depth.
[0002]
[Prior art]
Conventionally, packing bags for flower paste, jam, bean jam and the like, which are particularly viscous foods used in large volumes for business use, are manufactured by a three-way sealing method as shown in FIG. 1 (horizontal seals 10a and 10b, vertical seals). In the shape of 10c), it was sealed with a large capacity such as 1 kg to 10 kg. These packaging bags have to be made thicker so that they do not break due to external pressure such as dropping or vibration during storage and distribution. Furthermore, the contents to be packaged are subjected to storage work, external pressure such as dropping or vibration during distribution, the composition network of the contents collapses, and moisture from inside agglomerates on the surface of the packaging bag, resulting in poor quality and impaired appearance. It was recognized that. In recent years, foods such as ham and sausage have been filled into shrink films used for vacuum packaging and heated, so that the films shrink to the extent that they prevent mutual movement of the contents. Was being planned.
[0003]
In addition, in a commercial large-capacity food package, the opening is usually performed by piercing the knife directly into the product from above the film and tearing, or forming the initial opening starting point with scissors, from the thickness of the packaging bag. However, in a normal pillow packaging bag, the tearing direction was not determined, and the tearing was interrupted on the way, or proceeded in the lateral direction, resulting in insufficient opening. In addition, in the case of a pillow packaging bag in which a viscous food is packaged, it is impossible to remove the pillow packaging bag by hand, and as a result, it is necessary to reopen the bag in the vertical direction with an opening device again. Therefore, without reopening, a large amount of the food in the packaging bag remains in the packaging bag and is discarded as industrial waste, which places a greater burden on the environment and may pose a problem for the social responsibility of the trader. Furthermore, from the hygiene point of view, opening instruments such as knives, cutters and scissors can be a source of food poisoning if they come into direct contact with the product, which is expected to be unsanitary.
In addition, as consumers are becoming more concerned about food safety, major bakery makers, which are the main customers of the business-use packaging bags, are also working to prevent food-related accidents such as employee safety and contamination of products with foreign substances. From the viewpoint of prevention, there is a tendency to be tired of using sharp opening devices such as knives, cutters and scissors in the vicinity where food is handled.
[0004]
Thus, means for solving the problem of easy opening of a bag by using a uniaxially stretched film in the same direction as the tearing direction has been disclosed. However, this technology is mainly for retort foods, and is made of a plastic film that does not shrink (hereinafter, referred to as shrink). In many cases, it caused a decrease. In addition, uniaxially stretched film is excellent in various properties such as strength in place of it, and it is difficult to obtain it today because the demand is small compared to biaxially stretched film which is consumed in large quantities and inexpensive and distributed. However, it becomes an expensive product in terms of economy. Therefore, it cannot respond to packaging and maintaining quality of viscous foods that require shrink. Means for providing a notch in the back (vertical) seal portion when opening the packaging bag has also been disclosed. However, when forming a notch in the back seal part, especially in the continuous filling manufacturing and packaging process of viscous food for business, it is necessary to separately install a notch forming device in an existing filling machine, and The control requires separate control from the filling machine and must be tuned to the filling pattern of the filling machine. In addition, since the setting (cut timing) of the notch forming device must be changed every time the filling amount is changed, the operation involves complicated work. In addition, even if the back seal can be completely opened from the notch, the opening is narrow and it has been necessary to handle it again by hand to take out the contents. However, it is impossible to completely remove the contents by hand with viscous foods with high viscosity, and in order to prevent the product yield from lowering, it is necessary to open the product in the vertical direction with an opening device as well. Did not get. Thus, in the related art, it has been desired to open in the vertical direction so that the opening for taking out the contents easily can be made large.However, in the conventional notch forming apparatus, the notch formation in the horizontal seal portion is performed on the structure of the notch forming apparatus. Incorporation into the continuous filling process was impossible due to the packaging form of the continuous filling machine, and a notch had to be formed in the back seal.
[0005]
[Problems to be solved by the invention]
As described above, packaging commercial foods, especially viscous foods, with shrink films is a large-capacity package, and involves conditions that must enhance the heat-sealing strength, especially for impact resistance. Then, in the use of the general distribution packaging material, the thickness of the packaging material must be increased. As a result, there has been a problem that the packaging material is thick and further denatured hard by heat sealing, so that it is impossible to open it neatly with bare hands. Further, in the continuous filling machine for viscous foods for business use, in forming the notch in the packaging bag, the notch forming device in the conventional back seal portion has a notch formed in the horizontal seal portion due to the characteristics of the continuous filling machine. This could not be done in a series of filling steps. It is possible to form the notch manually or mechanically after each cutting of the packaging bag in the manufacturing process.However, to form the notch mechanically requires a large-scale device and a large installation space. It has been found that this has an effect on the economic efficiency in the manufacturing process.
[0006]
In addition, as consumers are becoming more concerned about food safety and hygiene, major business customers use sharp openers such as knives, cutters, and scissors from the perspective of preventing food-related accidents and managing hygiene. There is a tendency to get tired of using it in food manufacturing processes such as around filling machines.
[0007]
[Means for Solving the Problems]
In view of the above problems, the inventors of the present invention have conducted intensive studies to open a large-capacity commercial viscous food packaging bag without intentionally using a knife, cutter, scissors, or other opening device. It has been found that a method that can facilitate the above can be provided economically and with high productivity. That is, a biaxially stretched plastic film is used as a laminating material as a raw material of a packaging bag, a packaging bag is formed using a continuous filling machine, and a notch is set at a specific location at the same time.
[0008]
Therefore, the shrink film is, as shown in FIG. 2, a biaxially stretched polyamide base material (20) disposed on the outermost layer, and a heat-sealable sealant (23b) disposed on the inner layer with a polyolefin-based or polyester-based sealant. And a heat-sealable laminated plastic film in which at least one selected from the group consisting of polyamides was laminated.
[0009]
When the biaxially oriented polyamide of the outermost layer is exposed to a hot environment such as hot water or steam, it shrinks by 3 to 10% and compresses the contents so that they cannot move with each other. It has a function to adhere to.
[0010]
3 and 300 are enlarged views of a cross section of the vertical seal portion. 20c is a heat-sealed vertical seal portion, and 20d is an adhesive surface.
[0011]
The polyamide in the present invention refers to a resin having a main chain mainly composed of amide bonds, and contains aliphatic nylons such as nylon 6, nylon 66, nylon 12, and nylon 46, and aromatics such as MX-nylon. Aliphatic nylon, aromatic nylon or the like, or a copolymerized nylon thereof, or a mixture of these resins.
[0012]
In addition, a method for producing a biaxially stretched polyamide is produced by a generally performed infusion method or cast method, and is stretched by simultaneous biaxial stretching and sequential biaxial stretching. A biaxially stretched film may be prepared by a tubular method. The stretching ratio of the biaxial stretching is 2 to 6 times, preferably 3 to 5 times for each axis method. If the stretching ratio is less than 2 times, the effects of stretching, such as heat shrinkage and rupture resistance, will not be sufficiently exhibited. If the ratio exceeds 6 times, the film may break during stretching, and it is said that the film strength is remarkably reduced.
[0013]
The lamination method of the film used in the present invention can be produced by a commonly used dry lamination method, extrusion lamination method, hot lamination method or the like, or by laminating the respective layers by combining these. As the adhesive, a commonly used adhesive can be used.
[0014]
The thickness of the biaxially stretched polyamide film used in the present invention is 10 to 25 μm, and 15 μm is standard as a general commercial product. It is important that the thickness of the inner layer is such that the total of the laminated films is in the range of 50 μm to 80 μm, and the total sum of the base material and the sealant is appropriately selected from 60 μm to 105 μm depending on the content. When the total total is 60 μm or less, the strength as a commercial large-capacity package is insufficient. On the other hand, when the total total thickness is 105 μm or more, the film becomes hard, and when formed into a cylindrical shape by a continuous filling machine, a scratch is generated. It is generally said that cuts and the like occur, causing pinholes, ruptures, etc., and impairing the suitability of the filling machine.
[0015]
Next, a method of forming the shrink film used in the present invention into a pillow shape will be described. The method may be a known method, and a three-way sealing method is generally used from the viewpoint of productivity. However, using two sheets of films, heat-sealing is performed in advance except for the filling opening, and after filling, the opening is heat-sealed. The present invention can also be applied to a four-side seal type bag making method.
[0016]
Next, the setting position of the notch having the easy-open structure will be described. Commercial large-capacity packaging bags cannot be installed in any place like the notch of small-sized small-sized bag packaging that is commonly used, and the load force during loading, storage work, dropping during distribution, and vibration In some cases, the bag may be broken at the distribution stage due to the external pressure, and the setting position and the like must be sufficiently considered. In addition, the present invention is made with the most emphasis on the workability of users such as major bread makers, which are the main customers of commercial packaging bags, that is, the cleanliness and comfort of opening, and as a result, the notch serving as a starting point of opening. Identification of the position, seal width and notch depth was essential.
[0017]
For the easy-opening structure, a notch shape that is usually used can be used. As the shape, notches such as I-shaped (10d) and V-shaped (10e) illustrated in FIGS. 4 (enlarged view of the horizontal seal portion) and FIG. 5 can be used, but the shape is not particularly limited, and the shape is not limited to the tearing direction. Any pointed shape can be used.
[0018]
Any number of positions may be provided as long as at least one or more locations are provided on the upper and lower horizontal seals within a range of 20 to 70 mm, desirably 40 to 60 mm, with the vertical seal (10c) at the center therebetween. Desirably, each one is provided at a position facing the center of the packaging bag of the upper and lower horizontal seal portions. In general, since a label indicating the product content is attached to the surface of the packaging bag, the tearing in the vertical direction is interrupted or the direction is changed in the horizontal direction, and the packaging bag cannot be completely opened depending on the label type and position. This is because it is possible.
The complete unsealing referred to in the present invention means that tearing proceeds from the notch as a starting point in a direction perpendicular to the lateral seal to the other lateral seal portion without interruption and in a direction parallel to the lateral seal. .
[0019]
In FIG. 4, L3 is the length of the horizontal seal, which is 10 mm or more, preferably 15 mm or more in the present invention. L4 is the notch cut depth, which is 3 mm or more, preferably 5 mm or more in the present invention, and L5 is the distance from the notch tip to the contents. Opening property is not sufficiently satisfied. The upper limit of the length of L3 and L5 is not particularly limited. However, if L3 is too long, the holding plate (die) for forming the notch becomes unnecessarily large. Since a problem is caused in the formation, the upper limit of L3 is generally considered to be 20 to 30 mm from the appearance.
[0020]
The notch of the package will be described. In the present invention, when the biaxially stretched plastic film is filled with the contents in which the long side L1 / short side L2 of FIG. 1 is in the range of 1.5 to 6.0, desirably 1.8 to 3.5, It was confirmed that complete opening could be achieved only when at least one notch 10d for opening was provided in the horizontal seal portion.
[0021]
Although the tearing direction of a biaxially stretched plastic film is not fixed to a certain direction, the present invention does not allow the tearing in the long side (longitudinal) direction to be constant until a large volume of content is filled vertically and shrunk. I found that.
[0022]
This is because a biaxially stretched plastic film that originally shrinks uniformly cannot shrink uniformly due to the vertical and horizontal deviation of the contents, and the molecules that make up the film are subjected to shrinkage, resulting in a long side (vertical). This is due to rearrangement so that the tear is constant in the direction.
[0023]
The present invention pays attention to the fact that the biaxially stretched film is vertically filled with the contents and the shrinkage of the biaxially stretched film causes a difference in shrinkage rate, whereby a tear is determined in a long side (longitudinal) direction. In addition, by providing a notch for easy opening, using a knife, a cutter, scissors, or other unsealing equipment to open a large-capacity package of a business food, particularly a viscous food, which was impossible at all. It has been found that it can be easily performed without any problem.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Further, an embodiment of the commercial large-capacity packaging bag and the method for producing the same according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings.
[0025]
The packaging bag 100 shown in FIG. 1 is a commercial large-capacity packaging bag. After one sheet film is continuously formed into a tubular shape (vertical seal portion 10c), and then the horizontal seal portion 10b is heat-sealed. A predetermined amount of the content is filled from the opening 10a, and the opening 10a is horizontally sealed. Finally, the continuous packaging bags are sequentially cut off at the horizontal seal portion and sent to the shrink process. The separating step can be performed simultaneously with the horizontal sealing.
[0026]
FIG. 6 shows an example of the notch forming method. The packaging bag 30 before cutting is filled with the contents by performing the vertical sealing 30a and the horizontal sealing 30b, and the cooling and cutting pressing plates 40 and 60 are used for two bags. The cutting blade 50 is moved by the piston movement (open arrow 40X → 60X → 40X) from the slit 40c of the holding plate 40 with the horizontal sealing portion 30b being interposed therebetween, and cut by the cutting blade 50a at the center of the horizontal sealing portion 30b. And divided into 70a and 80a (L6 = L7 + L8). As a result, individually divided business-use packaging bags 70 and 80 are formed. The slit 40c needs an interval L9 such that the cutting blade does not touch it. If the slit is too wide, film holding becomes insufficient and cutting cannot be performed well. The pressing plate needs a slit width L10 so that the notch forming blades 50b, 50c for forming the notches 70b, 80b do not touch, and may be processed into a shape having 40d, 40e, 60a, 60b. If the slit is too wide, the film is not sufficiently pressed and notch formation cannot be performed well. L11 is the length of the notch forming blade and determines the notch cutting depth. If a notch is formed by this method, no chips will adhere to the packaging bag.
[0027]
Since it is only necessary to prepare a cutter for cutting the horizontal seal part with a notch forming blade as a cutter for cutting the horizontal seal part and replace it with a holding plate that has a structure that can use the cutter, when using an existing filling machine, The present invention is excellent in that the filling machine can be used under the same conditions as before without changing any settings. Therefore, since a separate device such as a conventional method for forming a notch in the back seal portion is not required, and a complicated operation by a separate control is not involved, a large-capacity packaging bag for business use can be easily opened at a low cost. And a method of forming the notch.
[0028]
Further, an example of the embodiment of the structure of the laminated film used in the commercial large-capacity packaging bag according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings.
[0029]
The laminated film 200 shown in FIG. 2 is a cross-sectional view of the shrink film used in the present invention.
[0030]
The shrink film 200 is configured by laminating a base material 20a that is responsible for a printed portion, pinhole resistance, and the like, and a sealant 20b that enables heat sealing with an adhesive 21. 20 is the outermost layer and is biaxially stretched nylon 6. Reference numeral 22 denotes a polyethylene used for buffering the separation between 20 and 23 due to shrink, and reference numeral 23 denotes a linear low-density polyethylene capable of performing good low-temperature heat sealing.
[0031]
Next, specific embodiments will be described in detail, and Examples 1 to 8 and Comparative Examples 1 to 7 are summarized in Tables 1 to 4.
[0032]
Embodiment 1
A laminated film (biaxially stretched nylon 6 (15 μm) / adhesive / unstretched polyethylene (20 μm) / linear low-density polyethylene (60 μm) wound into a roll having a width of 410 mm; total film manufactured by San-A Kaken Co., Ltd. Is applied to a continuous vertical filling machine (manufactured by ORIHIRO ENGINEERING CO., LTD.), And the bag is formed into a cylindrical shape by applying a vertical seal with a 180 ° C sealing plate. Subsequently, the lower horizontal seal was heat-sealed with a 180 ° C seal plate at a width of 40 mm (for two bags), and then 5 kg of 80 ° C flower paste as a content was filled. A horizontal seal for sealing the upper opening portion was heat-sealed to a width of 40 mm (for two bags). Finally, the package was cut at the center of the lower horizontal seal portion to prepare a packaging bag having a horizontal seal width of 20 mm. At this time, a notch having a cutting depth of 8 mm was simultaneously formed with the cutting cutter illustrated in FIG.
[0033]
The structure of the cutter is the structure shown in FIG. 6, and is provided with a notch forming blade (made of metal) having a length of 8 mm.
[0034]
The dimensions of the pillows thus separated were 180 mm in short side length, 550 mm in long side length, 20 mm in horizontal seal width and 25 mm in vertical seal width. The position of the notch was 50 mm from the center (the vertical seal portion), the cut depth was 8 mm, and the distance from the tip of the notch to the contents was 12 mm. Subsequently, a shrinking step of leaving the substrate in hot water of 92 ° C. for 1 minute is performed. The hot water temperature and time at this time are lower than this, and if it is short, the shrink film does not sufficiently shrink and does not exhibit its original function. Further, if the substrate is exposed to a high-temperature atmosphere for a longer period of time, the base material and the sealant layer are peeled off. As a result, the film strength and the seal strength are reduced, and the seal part is hardened, so that stress for opening is required more than necessary. The shrinking step is not limited to the above-mentioned numbers depending on the content volume and the temperature as long as the original shrinkage ratio is satisfied and the seal strength and the tearing stress are not required more than necessary. Furthermore, after cooling in running water for 1 hour and storing at room temperature for 24 hours, the evaluation shown in Table 1 was performed.
[0035]
Embodiment 2
In the preparation work of Example 1, only the filling amount of the contents was changed to 2.5 kg. As a result, the short side length was 180 mm and the long side length was 330 mm.
[0036]
Embodiment 3
In the preparation work of Example 1, only the filling amount of the contents was changed to 1.0 kg. As a result, the short side length was 180 mm and the long side length was 270 mm.
[0037]
[Comparative Example 1]
In the production work of Example 1, the following was used as the laminated film. Non-heat-shrinkable vinylidene chloride coated biaxially stretched nylon 6 (15 µm) / adhesive / unstretched low density polyethylene (20 µm) / linear low density polyethylene (50 µm); manufactured by Asahi Kasei Polyflex (total film thickness 85 µm) It was used.
[0038]
[Comparative Example 2]
Only the shrink process was omitted from the production process of the first embodiment.
[0039]
[Comparative Example 3]
In the production process of Example 1, only the filling amount was changed to 0.8 kg. As a result, the short side length was 180 mm and the long side length was 220 mm.
[Table 1] Examination of packaging material, shrink, aspect ratio (weight)

* 1: film change rate (%) calculated by long side length after shrink processing / long side length before shrink processing × 100
* 2; Same as * 1, the change rate of the short side length (%)
* 3: Number of packaging bags broken by dropping 10 packaging bags 5 times naturally from the position 1m above the ground.
* 4: The number of times the fingers were washed because the contents adhered and the hand with the film slipped when the 10 packaging bags were opened. A small number of times means that the container can be opened continuously, that is, it is easy to open.
* 5: Number of cleavages that progressed completely to the bottom of 10 packaging bags / Total number of processed bags × 100 (%)
* 6: The state of the contents when going back and forth between Ibaraki and Osaka by courier (distribution test)
○ is comparable to that before distribution, Δ is changeable before distribution but not abnormal in quality, and can be sold as a product. × indicates significant change in appearance (water separation) before distribution and cannot be sold as a product.
[0040]
As is clear from the results in Table 1, the complete opening rates of Examples 1 and 2 are remarkably better than those of Comparative Example, and it is also clear that Example 3 is good. This indicates that the biaxially stretched nylon film was determined to be torn in the long side (longitudinal) direction due to the difference in shrinkage. Also, as can be seen in Comparative Example 3, when the ratio of the length and width is 1.5 times or less, shrinkage occurs in the same manner as the length and width, and as a result, the tearing direction is not determined and complete opening is not performed. Furthermore, as can be seen from Comparative Example 2, even in the case of a shrink film, the tear direction is not determined unless the shrink process is performed. In other words, it was clarified that the tearing direction was determined for the first time by shrinking the biaxially stretched shrink film vertically and horizontally with different shrinkage rates.
[0041]
Embodiment 4
In the production process of Example 1, only the width of the horizontal seal was changed to 10 mm.
[0042]
Embodiment 5
In the production process of Example 2, the seal width was changed to 15 mm.
[0043]
[Comparative Example 4]
In the production process of Example 1, only the seal width was changed by 5 mm.
[0044]
[Table 2] Examination of seal width

[0045]
As is clear from the results of Table 2 and Comparative Example 4, when the seal width was 5 mm, it was found that the complete unsealing rate was significantly reduced regardless of the presence of the packaging material and the shrinkage. It is clear that it is necessary to be 10 mm or more, and desirably 15 mm or more. This is because, if the seal width is too narrow, the force of tearing is not transmitted well with the hand to which the content is attached, even though the notch is provided. As a result, the work of wiping hands many times was added, and workability was degraded.
[0046]
Embodiment 6
Only the notch cut depth in the preparation process of Example 1 was changed to 3 mm.
[0047]
Embodiment 7
Only the notch cut depth in the production process of Example 1 was changed to 5 mm.
[0048]
[Comparative Example 5]
The notch cut depth in the production process of Example 1 was changed to 1 mm.
[Table 3] Examination of notch depth

[0049]
As is clear from the results of Table 3 and Comparative Example 5, when the cut depth of the notch was 1 mm, the complete opening ratio was significantly reduced as compared with the range of Examples 6 and 7 of 3 mm or more. If the notch forming blade in FIG. 6 was too short, the notch could not be cut cleanly, which caused a decrease in the opening rate. Further, even if the cut is formed well, the tearing stress is not transmitted well, so that the tearing has occurred from the start in the lateral direction. Furthermore, it takes more force to open than necessary, and does not sufficiently satisfy the improvement of workability.
[0050]
Embodiment 8
Only the notch position in Example 1 was changed from the center (vertical seal portion) to 20 mm.
[0051]
Embodiment 9
In the production process of Example 2, only the notch position was changed to 70 mm from the center (vertical seal portion).
[0052]
[Comparative Example 6]
In the production process of Example 1, only the notch position was changed to 75 mm from the center (vertical seal portion).
[0053]
[Comparative Example 7]
In the production process of Example 1, only the notch position was changed to 10 mm from the center (vertical seal portion).
[0054]
[Table 4] Examination of notch position

[0055]
As is clear from the results in Table 4, when the notch forming position is 75 mm and 10 mm from the center (vertical seal portion) as in Comparative Examples 6 and 7, the complete unsealing rate is significantly lower than that of the example. . In the case of 10 mm, tearing was interrupted by an internal product, and when further force was applied, there was a strong tendency to tear in the lateral direction. In addition, if it is located as far as 75 mm, since tearing proceeds immediately after tearing because it is close to the side, tearing progresses in the horizontal direction, so that complete tearing often did not occur.
[0056]
【The invention's effect】
According to the present invention, the biaxially stretched polyamide is disposed on the outermost layer, and the specific shape (ratio) of the laminated shrink film in which the inner layer of the content is at least one or more selected from the group consisting of polyolefin, polyester, and polyamide ), The viscous food for business that has undergone the filling and heat shrinking steps is completely opened without using a knife, cutter, scissors, or other opening device by providing a notch with a specific shape at a specific position. And thus a wider opening for easy removal of the contents can be ensured. It is only necessary to change the cutter of the existing filling machine and its holding plate, and it does not involve separate equipment and separate control, so it can be provided inexpensively and with good productivity. This can greatly contribute to improving the opening workability of a certain bakery industry.
[Brief description of the drawings]
FIG. 1 is a plan view of a packaging bag according to the present invention.
FIG. 2 is an enlarged sectional view of lamination of a heat-shrinkable plastic film.
FIG. 3 is a partially enlarged cross-sectional view of a vertical seal portion.
FIG. 4 is an enlarged view showing a shape and a position of a notch according to the present invention.
FIG. 5 is a partially enlarged view showing an example of a method for forming a notch according to the present invention.
FIG. 6 is a partially enlarged view showing a step of manufacturing a packaging bag according to the present invention.
[Explanation of symbols]
100 packaging bag
10a, horizontal seal
10b, horizontal seal
10c, vertical seal
10d notch
10e notch
L1 ... long side
L2-short side
L3 ... Length of horizontal seal
L4-Notch depth
L5: Distance from tip of notch to contents
L6 ··· Length of horizontal seal before cutting
L7 ··· Length of horizontal seal after cutting
L8: Length of horizontal seal after cutting
L9 ··· Cutter storage section and slit length
L10, notch blade storage section and slit width
L11 ・ Notch forming blade length
L12 Notch depth
200 ・ Laminated cross section of heat shrinkable plastic film
20 .. Biaxially oriented polyamide of base material
20a / base material
Cross section of 20b sealant layer
20c heat seal vertical seal cross section
20d, vertical seal adhesive surface
21 ・ ・ Adhesive layer
22 ・ ・ Unstretched polyethylene
23. ・ Sealant linear low density polyethylene
300 ・ Seal cross section of heat-shrinkable plastic film
30. Horizontal and vertical sealing of bags made by continuous filling machine
30a, vertical seal
30b-Horizontal seal before cutting
Enlarged view showing the shape and position of the 400-notch
40 ... holding plate
40a, upper part of holding plate
40b, lower part of holding plate
40c cutter storage section and movable slit
40d, notch forming blade storage and movable slit
40e, notch forming blade storage and movable slit
40X, Notch forming blade moving direction
Partially enlarged view showing an example of a method of forming a 500 notch
50..Cutter for cutting horizontal seal part and blade for forming notch
50a, cutter tip
50b, notch forming edge
50c, notch forming blade
600: Schematic diagram of the process for manufacturing packaging bags
60 ... holding plate
60a, notch forming blade storage and movable slit
60b, notch forming blade storage and movable slit
60X Notch forming blade moving direction
Part of one of the packaging bags continuously manufactured according to the present invention
70a horizontal seal
70b notch
70c, vertical seal
80 Part of the other packaging bag manufactured continuously according to the present invention
80a, horizontal seal
80b notch
80c, vertical seal

Claims (4)

A bag for packing viscous foods such as flower paste, jam, bean paste, etc., in a business-use packaging bag having a content of 1 kg to 10 kg, forming a laminate with a heat-shrinkable plastic film and forming a thickness of 60 μm to A commercial packaging bag having a width of 105 μm, a notch provided in a horizontal seal portion, and a ratio of short side to long side of the packaging bag in a range of 1: 1.5 to 6.0. The heat-shrinkable plastic film is a laminated film, wherein the outermost layer is a biaxially stretched polyamide, and the inner layer is at least one selected from the group consisting of polyolefins, polyesters, and polyamides. Item 4. A commercial packaging bag according to Item 1. The width of the horizontal seal is 10 mm or more, the cut depth of the notch is 3 mm or more, and the position of the notch is provided in the range of 20 to 70 mm from the center of the packaging bag (vertical seal portion). Commercial packaging bags. The heat-shrinkable plastic film wound into a roll is made into a laminated film with the outermost layer made of biaxially-rolled polyamide and the inner layer made of polyethylene, and is applied to a continuous vertical filling machine. After the bag is sealed, the lower horizontal seal is heat-sealed with a seal plate at a width of 20 mm or more, and the other horizontal seal for sealing is heat-sealed at a width of 20 mm or more, and finally cut at the center of the lower horizontal seal portion. A method for manufacturing a business-use packaging bag obtained by preparing a packaging bag having a width of 10 mm or more in horizontal seal and forming a notch having a depth of 3 mm or more in a position 20 mm to 70 mm from the center (vertical seal portion) with a cutting cutter. .

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