JP6888555B2 - 包装袋 - Google Patents
包装袋 Download PDFInfo
- Publication number
- JP6888555B2 JP6888555B2 JP2017558298A JP2017558298A JP6888555B2 JP 6888555 B2 JP6888555 B2 JP 6888555B2 JP 2017558298 A JP2017558298 A JP 2017558298A JP 2017558298 A JP2017558298 A JP 2017558298A JP 6888555 B2 JP6888555 B2 JP 6888555B2
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- JP
- Japan
- Prior art keywords
- packaging bag
- seal portion
- sealant layer
- sheet
- foamed resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004806 packaging method and process Methods 0.000 title claims description 197
- 239000000463 material Substances 0.000 claims description 87
- 239000000565 sealant Substances 0.000 claims description 65
- 229920005989 resin Polymers 0.000 claims description 50
- 239000011347 resin Substances 0.000 claims description 50
- 238000005187 foaming Methods 0.000 claims description 32
- 239000000049 pigment Substances 0.000 claims description 22
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 21
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 18
- 230000003068 static effect Effects 0.000 claims description 11
- 238000009751 slip forming Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 73
- 238000012360 testing method Methods 0.000 description 39
- 239000004698 Polyethylene Substances 0.000 description 31
- 229920000573 polyethylene Polymers 0.000 description 31
- 238000011156 evaluation Methods 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 239000005020 polyethylene terephthalate Substances 0.000 description 12
- 229920000139 polyethylene terephthalate Polymers 0.000 description 12
- 238000012545 processing Methods 0.000 description 11
- 239000012790 adhesive layer Substances 0.000 description 9
- 239000000123 paper Substances 0.000 description 9
- 239000004700 high-density polyethylene Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229920001903 high density polyethylene Polymers 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 238000012856 packing Methods 0.000 description 6
- -1 polyethylene terephthalate Polymers 0.000 description 6
- 238000012669 compression test Methods 0.000 description 4
- 239000002655 kraft paper Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 241000238370 Sepia Species 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229920004889 linear high-density polyethylene Polymers 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Description
図1は、本実施形態に係る包装袋1を形成する積層体10の構造を模式的に示す断面図である。積層体10は、樹脂からなるシート状の基材3と、基材3の一方面側に積層された発泡樹脂シートからなる緩衝材7と、緩衝材7のさらに一方面側に積層されたシート状のシーラント層9と、を有している。本実施形態では、基材3と緩衝材7とは異なる樹脂によって形成されており、基材3と緩衝材7との間には基材3と緩衝材7とを接着させるためのシート状の接着層5が形成されている。積層体10における基材3側の面には、エンボス加工が施されていてもよい。緩衝材7を形成する発泡樹脂シートは、架橋された発泡樹脂シート及び無架橋の発泡樹脂シートのいずれであってもよい。
第2実施形態に係る包装袋101は、図5に示すように、シール部11に代えてシール部111を備える点と、ノッチ17に代えてノッチ117を備える点で第1実施形態の包装袋1と相違している。以下、主として第1実施形態と相違する点について説明し、同一の要素や部材については同一の符号を付して詳しい説明は省略する。
第3実施形態に係る包装袋201は、図6に示すように、シール部11及びシール部13に代えてシール部213及びシール部215を備える点と、ノッチ17に代えてノッチ217を備える点で第1実施形態の包装袋1と相違している。以下、主として第1実施形態と相違する点について説明し、同一の要素や部材については同一の符号を付して詳しい説明は省略する。
第4実施形態に係る包装袋301は、図7に示すように、シール部314をさらに備える点と、ノッチ17に代えてノッチ317を備える点で第1実施形態の包装袋1と相違している。以下、主として第1実施形態と相違する点について説明し、同一の要素や部材については同一の符号を付して詳しい説明は省略する。
厚さ12μmのPETシートを基材として、ルーダー加工によって厚さ15μmのPE層(接着層)を積層した。次いで、熱ラミネート加工によってPE層側に厚さ1.5mmの発泡PEシート(緩衝材)を積層し、この積層された発泡PEシートに対して、熱ラミネート加工によって厚さ30μmのLLDPEシート(シーラント層)を積層した。そして、基材の表面側に5mm間隔の格子状のエンボス加工を施すことによって、積層体を得た。積層体を構成する発泡PEシートの発泡倍率は10倍であった。この積層体を、長辺が340mm、短辺が240mm、厚さが30mmとなるように、LLDPEシートを内側にしてピロー形状にし、内容物を収容した状態で長手方向の両端をヒートシールすると共に、一方のシール部にノッチを形成することによって実施例1の包装袋を得た。また、包装袋の長手方向は、緩衝材のMD方向に一致させた。
実施例2の包装袋は、緩衝材として発泡倍率が20倍の発泡PEシートを用いた点のみ実施例1の包装袋と相違する。すなわち、実施例2の包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率20倍の発泡PEシート、及び、厚さ30μmのLLDPEシートが順次積層された積層体によって形成されていた。
実施例3の包装袋は、緩衝材として発泡倍率が30倍の発泡PEシートを用いた点のみ実施例1の包装袋と相違する。すなわち、実施例3の包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率30倍の発泡PEシート、及び、厚さ30μmのLLDPEシートが順次積層された積層体によって形成されていた。
実施例4の包装袋は、緩衝材として発泡倍率が40倍の発泡PEシートを用いた点のみ実施例1の包装袋と相違する。すなわち、実施例4の包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率40倍の発泡PEシート、及び、厚さ30μmのLLDPEシートが順次積層された積層体によって形成されていた。
実施例5の包装袋は、緩衝材として発泡倍率が50倍の発泡PEシートを用いた点のみ実施例1の包装袋と相違する。すなわち、実施例5の包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率50倍の発泡PEシート、及び、厚さ30μmのLLDPEシートが順次積層された積層体によって形成されていた。
実施例6の包装袋は、シーラント層であるLLDPEシートに凹凸を設けて、その摩擦係数が高められている点で実施例3の包装袋と相違する。すなわち、実施例6の包装袋は、その内層側の静止摩擦係数が0.26であり、その動摩擦係数が0.25であった。また、この包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率30倍の発泡PEシート、及び、厚さ30μmのLLDPEシートが順次積層された積層体によって形成されていた。なお、実施例3の包装袋では、その内層側の静止摩擦係数は0.19であり、その動摩擦係数は0.18であった(表3参照)。
実施例7の包装袋は、シーラント層であるLLDPEシートに凹凸を設けて、その摩擦係数が高められている点で実施例3の包装袋と相違する。すなわち、実施例7の包装袋は、その内層側の静止摩擦係数が0.33であり、その動摩擦係数が0.32であった。また、この包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率30倍の発泡PEシート、及び、厚さ30μmのLLDPEシートが順次積層された積層体によって形成されていた。なお、実施例6及び7に示す凹凸のあるシートは、所定の摩擦係数となるように凹凸が付与されたシートを入手して用いてもよいし、平坦なシートに対して、公知の方法で凹凸を付与してもよい。
実施例8の包装袋は、シーラント層がHDPEシートであった点のみ実施例3の包装袋と相違する。このHDPEシートの厚みは30μmであった。すなわち、実施例8の包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率30倍の発泡PEシート、及び、厚さ30μmのHDPEシートが順次積層された積層体によって形成されていた。なお、この包装袋では、内層がHDPEシートからなるため、その静止摩擦係数が0.14であり、その動摩擦係数が0.11であった。
比較例1の包装袋は、内側にPEを材料とした気泡緩衝材が配置され、外側がクラフト紙によって形成されたものであり、気泡緩衝材とクラフト紙とが接着剤によって貼着されたものである。この包装袋では、一方の長辺側に封緘片が設けられており、この封緘片には粘着テープが貼着されていた。
比較例2の包装袋は、包装袋の長手方向が発泡PEシートのTD方向に一致していた点のみ実施例2の包装袋と相違する。すなわち、比較例2の包装袋では、ノッチによる開封方向が発泡PEシートのMD方向ではなく、TD方向に一致していた。
実施例9の包装袋は、シーラント層として厚さ30μmの着色LLDPEシートを用いた点のみ実施例3と相違する。すなわち、実施例9の包装袋は、厚さ12μmのPETシート、厚さ15μmのPE層、厚さ1.5mmで発泡倍率30倍の発泡PEシート、及び、厚さ30μmのLLDPEシートが順次積層された積層体によって形成されていた。なお、実施例9の包装袋は、振動試験、圧縮試験、耐水性試験、耐湿性試験、耐熱性試験、耐衝撃性試験の何れも実用上、問題がないものであった。
Claims (12)
- 樹脂からなるシート状の基材と、前記基材よりも内側に積層された発泡樹脂シートからなる緩衝材と、前記緩衝材よりも内側に積層されたシーラント層とを備えた積層体が、平面視矩形の袋形状に形成される包装袋であって、
前記包装袋は、少なくとも前記発泡樹脂シートの流れ方向における一方の端縁に、前記シーラント層同士がシールされ、且つ、前記流れ方向に直交する方向に延びる第1シール部を備えており、当該第1シール部に前記発泡樹脂シートの流れ方向における他方の端縁に向かう切込起点部が形成されており、
前記シーラント層の静止摩擦係数及び動摩擦係数が0.18〜0.5の範囲である、
包装袋。 - 樹脂からなるシート状の基材と、前記基材よりも内側に積層された発泡樹脂シートからなる緩衝材と、前記緩衝材よりも内側に積層されたシーラント層とを備えた積層体が、平面視矩形の袋形状に形成される包装袋であって、
前記包装袋は、少なくとも前記発泡樹脂シートの流れ方向における一方の端縁に、前記シーラント層同士がシールされ、且つ、前記流れ方向に直交する方向に延びる第1シール部を備えており、当該第1シール部に前記発泡樹脂シートの流れ方向における他方の端縁に向かう切込起点部が形成されており、
前記シーラント層は実質的にLLDPEから成る、包装袋。 - 前記シーラント層は実質的にLLDPEから成る、請求項1に記載の包装袋。
- 前記発泡樹脂シートの発泡倍率が18〜50倍である、請求項1〜3の何れか一項に記載の包装袋。
- 前記発泡樹脂シートの発泡倍率が18〜32倍である、請求項1〜3の何れか一項に記載の包装袋。
- 前記シーラント層が有色顔料を含む、請求項1〜5の何れか一項に記載の包装袋。
- 前記シーラント層には前記有色顔料が1〜10重量%含まれている、請求項6に記載の包装袋。
- 前記シーラント層には前記有色顔料が3〜5重量%含まれている、請求項6に記載の包装袋。
- 前記緩衝材の厚みが1〜5mmである、請求項1〜8の何れか一項に記載の包装袋。
- 前記包装袋の側縁において前記シーラント層同士がシールされ、且つ、前記発泡樹脂シートの前記流れ方向に沿って前記第1シール部と一部が重複するように延びる第2シール部をさらに備え、
前記切込起点部は、前記第1シール部と前記第2シール部との当該重複部分に形成されている、請求項1〜9の何れか一項に記載の包装袋。 - 前記第1シール部に形成されている前記切込起点部は、連続して波形形状に形成されている複数のノッチを含む、請求項1〜9の何れか一項に記載の包装袋。
- 前記第1シール部に部分的に重複するように形成された第3シール部をさらに備え、
前記第3シール部は、前記第1シール部における前記発泡樹脂シートの流れ方向に直交する方向の一方の側縁を含んで、平面視で直角三角形状に形成されており、
前記切込起点部は、前記第1シール部と前記第3シール部との当該重複部分に形成されている、請求項1〜9の何れか一項に記載の包装袋。
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