JP6312892B1 - Envelope with buffer function and envelope packaging sheet - Google Patents
Envelope with buffer function and envelope packaging sheet Download PDFInfo
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- JP6312892B1 JP6312892B1 JP2017072294A JP2017072294A JP6312892B1 JP 6312892 B1 JP6312892 B1 JP 6312892B1 JP 2017072294 A JP2017072294 A JP 2017072294A JP 2017072294 A JP2017072294 A JP 2017072294A JP 6312892 B1 JP6312892 B1 JP 6312892B1
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 34
- 229920005989 resin Polymers 0.000 claims abstract description 91
- 239000011347 resin Substances 0.000 claims abstract description 91
- 230000006835 compression Effects 0.000 claims description 20
- 238000007906 compression Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 abstract description 32
- 230000037303 wrinkles Effects 0.000 abstract description 12
- 230000003139 buffering effect Effects 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 98
- 239000000123 paper Substances 0.000 description 72
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000758 substrate Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229920001903 high density polyethylene Polymers 0.000 description 7
- 239000004700 high-density polyethylene Substances 0.000 description 7
- 239000002655 kraft paper Substances 0.000 description 7
- 229920001684 low density polyethylene Polymers 0.000 description 7
- 239000004702 low-density polyethylene Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Landscapes
- Buffer Packaging (AREA)
Abstract
【課題】 内容物を搬送時の衝撃等から保護することができ、更に荷物の発送作業も効率良く行え、また搬送中に湿度変化に晒された場合でも、表面に大きなシワや折れ目、湾曲が生じて外観が悪化する心配もない緩衝機能付き封筒、及びそれに用いる封筒用包装シートを提供すること。【解決手段】 紙基材層１の内側に緩衝シート層２が積層一体化されて成る緩衝機能付き封筒において、前記緩衝シート層２に、発泡倍率20倍以上の柔軟な発泡樹脂シートを使用すると共に、当該発泡樹脂シートを面方向(面内方向)に圧縮させた状態で紙基材層１に貼り付ける構成を採用した。【選択図】 図１PROBLEM TO BE SOLVED: To protect contents from an impact at the time of transportation, and also to efficiently deliver a package, and even when exposed to a change in humidity during transportation, the surface has large wrinkles, creases, curves, etc. To provide an envelope with a buffering function and a packaging sheet for an envelope used therefor, in which there is no concern that the appearance will be deteriorated due to the occurrence of the problem. SOLUTION: In an envelope with a buffer function in which a buffer sheet layer 2 is laminated and integrated inside a paper base layer 1, a flexible foamed resin sheet having an expansion ratio of 20 times or more is used for the buffer sheet layer 2. In addition, a configuration was adopted in which the foamed resin sheet was affixed to the paper base material layer 1 while being compressed in the surface direction (in-plane direction). [Selection] Figure 1
Description
本発明は、緩衝機能付き封筒の改良、詳しくは、搬送時において内容物を衝撃等から保護することができ、また搬送中に湿度変化に晒された場合でも、表面に大きなシワや折れ目、湾曲が生じて外観が悪化することのない緩衝機能付き封筒、及びそれに用いる封筒用包装シートに関するものである。 The present invention is an improvement of an envelope with a buffer function, specifically, the contents can be protected from impact during transportation, and even when exposed to humidity changes during transportation, large wrinkles and creases on the surface, The present invention relates to an envelope with a buffering function that does not deteriorate in appearance due to bending, and an envelope packaging sheet used therefor.
周知のとおり、書類や小さい荷物などを送る際には封筒に入れて送るのが一般的であるが、通常使用される紙から成る封筒は、搬送中の衝撃によって内容物が破損するリスクがあるため、比較的破損し易い荷物(例えばガラス製のアクセサリー等)を送る際には、荷物を発砲樹脂シート等でラッピングしてから封筒に入れる必要がある。 As is well known, when sending documents or small parcels, it is common to send them in envelopes. However, envelopes made of paper that are normally used have a risk of damage to the contents due to impact during transportation. Therefore, when sending a package that is relatively easily damaged (for example, a glass accessory), it is necessary to wrap the package with a foamed resin sheet or the like and then put it in an envelope.
しかしながら、多くの荷物を個別に包装して送る必要があるネット販売等のビジネスにおいては、上記のように荷物を一つ一つラッピングして封筒に入れていると、荷物の発送作業を迅速に行うことができないという問題があるだけでなく、ラッピング材(発泡樹脂シート)の無駄も生じ易いため、コスト面でも不利になり易い。 However, in businesses such as online sales where many packages need to be individually wrapped and sent, if the packages are wrapped one by one in the envelope as described above, the shipment of the packages can be carried out quickly. Not only is there a problem that it cannot be performed, but also the wrapping material (foamed resin sheet) is likely to be wasted, which is disadvantageous in terms of cost.
そこで、従来においては、封筒の紙基材の内側に発泡樹脂シートを貼り合わせた緩衝機能付きの封筒も開発されているが(例えば、特許文献１参照)、この種の封筒に関しては、製造時に発泡樹脂シートが引き伸ばされた状態で紙基材に貼り付けられていたため、封筒が湿度変化に晒された際に封筒の表面に大きなシワや折れ目、湾曲が生じ易かった。 Therefore, conventionally, an envelope with a buffer function in which a foamed resin sheet is bonded to the inside of the paper substrate of the envelope has been developed (see, for example, Patent Document 1). Since the foamed resin sheet was affixed to the paper substrate in a stretched state, large wrinkles, creases, and curves were likely to occur on the envelope surface when the envelope was exposed to changes in humidity.
これは、封筒の構成する紙基材が高湿度の環境下で伸張(膨張)した際、引き伸ばされた状態で貼り付けられた発泡樹脂シートが紙基材の伸張に追従できずに紙基材を変形させてしまうことが大きな要因であったが、この搬送時の湿度変化による外観悪化の問題を解決した緩衝機能付き封筒は従来知られていなかった。 This is because the foamed resin sheet attached in the stretched state cannot follow the expansion of the paper base when the paper base constituting the envelope is stretched (expanded) in a high humidity environment. However, an envelope with a buffer function that has solved the problem of deterioration in appearance due to a change in humidity during conveyance has not been known.
本発明は、上記の如き問題に鑑みて為されたものであり、その目的とするところは、内容物を搬送時の衝撃等から保護することができ、更に荷物の発送作業も効率良く行え、また搬送中に湿度変化に晒された場合でも、表面に大きなシワや折れ目、湾曲が生じて外観が悪化する心配もない緩衝機能付き封筒、及びそれに用いる封筒用包装シートを提供することにある。 The present invention has been made in view of the problems as described above, and the object of the present invention is to protect the contents from impacts during transportation and the like, and to efficiently carry out the shipment work of the luggage, Another object of the present invention is to provide an envelope with a buffering function and a packaging sheet for an envelope used therefor, in which even when exposed to a change in humidity during transportation, the surface does not have a large wrinkle, a crease, or a curvature and the appearance is not deteriorated. .
本発明者が上記課題を解決するために採用した手段を説明すれば次のとおりである。 Means adopted by the present inventor for solving the above-described problems will be described as follows.
即ち、本発明は、紙基材層１の内側に緩衝シート層２が積層一体化されて成る緩衝機能付き封筒において、前記緩衝シート層２に、発泡倍率20倍以上の柔軟な発泡樹脂シートを使用すると共に、当該発泡樹脂シートを面方向(面内方向)に圧縮させた状態で紙基材層１に貼り付けた点に特徴がある。 That is, according to the present invention, in the envelope with a buffer function in which the buffer sheet layer 2 is laminated and integrated inside the paper base material layer 1, a flexible foamed resin sheet having an expansion ratio of 20 times or more is provided on the buffer sheet layer 2. It is characterized in that the foamed resin sheet is attached to the paper base material layer 1 while being used and compressed in the surface direction (in-plane direction).
また上記緩衝シート層２を構成する発泡樹脂シートについては、低湿度の状態で紙基材層１に過大な負荷がかからないように圧縮率を95％〜99.5％とするのが好ましい。なお「圧縮率」については、圧縮率＝圧縮後の面積／圧縮前の面積×１００の計算式で算出するものとする。 Moreover, about the foamed resin sheet which comprises the said buffer sheet layer 2, it is preferable that a compression rate shall be 95%-99.5% so that an excessive load may not be applied to the paper base material layer 1 in a low humidity state. The “compression ratio” is calculated by the following formula: compression ratio = area after compression / area before compression × 100.
また上記緩衝シート層２を構成する発泡樹脂シートに関しては、紙基材層１のＣＤ方向(抄紙機の進行方向に直角な方向、横目)に圧縮された状態とするのが好ましい。これは紙基材層１が、湿度変化によりＣＤ方向に伸縮し易いためである。 Further, the foamed resin sheet constituting the buffer sheet layer 2 is preferably compressed in the CD direction of the paper base layer 1 (direction perpendicular to the traveling direction of the paper machine, horizontal direction). This is because the paper base material layer 1 easily expands and contracts in the CD direction due to a change in humidity.
また更に上記緩衝シート層２を構成する発泡樹脂シートについては、封筒の幅方向に圧縮された状態とするのが好ましい。これは封筒の幅方向に紙が伸縮することにより封筒表面に折れ目や撓みが発生し易いためである。 Furthermore, the foamed resin sheet constituting the buffer sheet layer 2 is preferably compressed in the width direction of the envelope. This is because folds and deflection are likely to occur on the envelope surface as the paper expands and contracts in the width direction of the envelope.
一方、本発明では、上記緩衝シート層２の内側に樹脂フィルム層３を形成することもでき、その場合には、当該樹脂フィルム層３を、緩衝シート層２を構成する発泡樹脂シートの圧縮によりシワが入った状態、或いは撓んだ状態とすることで、緩衝シート層２と一緒に紙の伸縮に追従させることができる。 On the other hand, in this invention, the resin film layer 3 can also be formed inside the said buffer sheet layer 2, In that case, the said resin film layer 3 is compressed by the foamed resin sheet which comprises the buffer sheet layer 2. By making the wrinkled state or the bent state, it is possible to follow the expansion and contraction of the paper together with the buffer sheet layer 2.
また本発明においては、上記緩衝機能付き封筒に使用される封筒用包装シートＳであって、紙基材層１の片面に緩衝シート層２が積層一体化されて成る包装シートＳを、緩衝シート層２に、発泡倍率20倍以上の柔軟な発泡樹脂シートを使用すると共に、当該発泡樹脂シートが面方向に圧縮された状態で紙基材層１に貼り付けて構成することができる。 Moreover, in this invention, it is the packaging sheet S for envelopes used for the said envelope with a buffer function, Comprising: The packaging sheet S by which the buffer sheet layer 2 is laminated | stacked and integrated on the single side | surface of the paper base material layer 1 is used. A flexible foamed resin sheet having an expansion ratio of 20 times or more can be used for the layer 2 and the foamed resin sheet can be applied to the paper base material layer 1 in a compressed state in the surface direction.
本発明では、封筒を構成する紙基材層の内側に、発泡倍率20倍以上の柔軟な発泡樹脂シートを積層一体化すると共に、この発泡樹脂シートを紙基材の面方向に圧縮させた状態で貼り付けて緩衝シート層を形成しているため、高湿度下で紙基材が伸張した場合でも発砲樹脂シートを追従させることが可能となる。 In the present invention, a flexible foamed resin sheet having an expansion ratio of 20 times or more is laminated and integrated inside the paper base material layer constituting the envelope, and the foamed resin sheet is compressed in the surface direction of the paper base material. Thus, the foamed resin sheet can be made to follow even when the paper substrate is stretched under high humidity.
そのため、本発明では、搬送時に封筒が湿度変化に晒された場合でも、封筒の表面に大きな折れ目やシワ、湾曲等が生じないため、封筒の外観悪化を防止できる。加えて、本発明では、緩衝シート層により内容物を搬送時の衝撃から保護できるだけでなく、ラッピング作業も不要となるため荷物の発送作業も効率的に行える。 Therefore, in the present invention, even when the envelope is exposed to a change in humidity during conveyance, large folds, wrinkles, curvature, and the like do not occur on the surface of the envelope, so that deterioration of the appearance of the envelope can be prevented. In addition, according to the present invention, not only can the contents be protected by the shock-absorbing sheet layer, but also the wrapping operation is not required, so that the package can be shipped efficiently.
したがって、本発明により、包装資材として荷物の保護を充分に行えるだけでなく、荷物到着時の外観の印象も良好な緩衝機能付き封筒、及びそれに用いる封筒用包装シートを提供できることから、本発明の実用的利用価値は頗る高い。 Therefore, according to the present invention, it is possible not only to sufficiently protect the package as a packaging material, but also to provide an envelope with a buffering function with an excellent appearance impression upon arrival of the package, and an envelope packaging sheet used for the envelope. The practical utility value is very high.
『第一実施形態』
次に、本発明の第一実施形態について図１に基づいて説明する。なお図中、符号Ｓで指示するのものは、包装シートであり、符号１で指示するものは、紙基材層である。また符号２で指示するものは、緩衝シート層であり、符号３で指示するものは、樹脂フィルム層である。
"First embodiment"
Next, a first embodiment of the present invention will be described with reference to FIG. In the figure, what is indicated by reference numeral S is a packaging sheet, and what is indicated by reference numeral 1 is a paper base layer. What is indicated by reference numeral 2 is a buffer sheet layer, and what is indicated by reference numeral 3 is a resin film layer.
「包装シート及び封筒の構成」
[１]封筒用包装シートの基本構成について
まず包装シートＳの基本構成について説明する。本実施形態では、図１に示すように、紙基材層１の片面に緩衝シート層２及び樹脂フィルム層３を順に積層一体化して包装シートＳを構成している。また緩衝シート層２には、発泡倍率20倍以上の柔軟な発泡樹脂シートを使用すると共に、この発泡樹脂シートを面方向(面内方向)に圧縮させた状態で紙基材層１に貼り付けている。また樹脂フィルム層３は、緩衝シート層２を構成する発泡樹脂シートの圧縮によりシワが入った状態、或いは撓んだ状態となっている。
“Composition of packaging sheet and envelope”
[1] Basic configuration of envelope packaging sheet First, the basic configuration of the packaging sheet S will be described. In the present embodiment, as shown in FIG. 1, a buffer sheet layer 2 and a resin film layer 3 are sequentially laminated and integrated on one side of a paper base material layer 1 to constitute a packaging sheet S. For the buffer sheet layer 2, a flexible foamed resin sheet having an expansion ratio of 20 times or more is used, and the foamed resin sheet is applied to the paper base material layer 1 in a compressed state in the surface direction (in-plane direction). ing. The resin film layer 3 is wrinkled or bent due to compression of the foamed resin sheet constituting the buffer sheet layer 2.
[２]緩衝機能付き封筒の構成について
次に上記包装シートＳから成る緩衝機能付き封筒について説明する。本実施形態では、上記包装シートＳの紙基材層１を外側、緩衝シート層２及び樹脂フィルム層３を内側に配置して封筒を構成している(図示せず)。また本実施形態では、封筒の幅方向(開口部を有する一辺に並行な方向)と紙基材１のＣＤ方向(抄紙機の進行方向に直角な方向、横目)が揃うように封筒を構成している。
[2] Configuration of Envelope with Buffer Function Next, an envelope with a buffer function composed of the packaging sheet S will be described. In the present embodiment, an envelope is formed by disposing the paper base layer 1 of the packaging sheet S on the outside and the buffer sheet layer 2 and the resin film layer 3 on the inside (not shown). Further, in the present embodiment, the envelope is configured so that the width direction of the envelope (direction parallel to one side having the opening) and the CD direction of the paper substrate 1 (direction perpendicular to the advancing direction of the paper machine, horizontal line) are aligned. ing.
[３]封筒の湿度変化に対する耐性について
そして上記のように緩衝機能付き封筒を構成したことにより、紙基材層１の面方向の伸縮に対し緩衝シート層２や樹脂フィルム層３を追従させることが可能となるため、使用時に封筒が湿度変化に晒された場合でも封筒の表面(紙基材層１)に大きな折り目やシワ、撓み等が生じ難くなり、外観の悪化を抑制することができる。
[3] Resistance to the humidity change of the envelope And by configuring the envelope with a buffer function as described above, the buffer sheet layer 2 and the resin film layer 3 are made to follow the expansion and contraction in the surface direction of the paper base material layer 1. Therefore, even when the envelope is exposed to changes in humidity during use, large folds, wrinkles, bending, etc. are unlikely to occur on the envelope surface (paper base material layer 1), and deterioration of the appearance can be suppressed. .
[４]紙基材層について
次に上記包装シートＳの構成要素について説明する。まず上記紙基材層１の材料については、封筒に一般的に使用されている紙材を使用することができ、具体的にはクラフト紙や和紙、上質紙、コート紙、レイド紙等を使用することができる。また紙材の目付量(または厚さ)については、封筒の用途に適した範囲内で適宜選択することができる。
[4] Paper Base Layer Next, the components of the packaging sheet S will be described. First, for the material of the paper base layer 1, paper materials generally used for envelopes can be used, and specifically, kraft paper, Japanese paper, fine paper, coated paper, raid paper, etc. are used. can do. Further, the basis weight (or thickness) of the paper material can be appropriately selected within a range suitable for the use of the envelope.
[５]緩衝シート層について
一方、上記緩衝シート層２の材料については、機能性及びコスト面を考慮して低密度ポリエチレンから成る発泡樹脂シートを使用することが好ましいが、それ以外のポリオレフィン系樹脂やポリスチレン等から成る発泡樹脂シートを使用することもできる。また発泡樹脂シートの発泡倍率に関しては、柔軟性を付与できる範囲で適宜選択することができるが、特に発泡倍率25倍〜40倍の発泡樹脂シートの使用が好ましい。また発泡樹脂シートの厚さに関しても、緩衝性が得られる範囲内で適宜選択することができるが、特に厚さ0.5mm〜2.0mmの発泡樹脂シートの使用が好ましい。
[5] Buffer sheet layer On the other hand, as the material of the buffer sheet layer 2, it is preferable to use a foamed resin sheet made of low-density polyethylene in consideration of functionality and cost, but other polyolefin resins are used. Alternatively, a foamed resin sheet made of polystyrene or the like can be used. Further, the expansion ratio of the foamed resin sheet can be appropriately selected within a range where flexibility can be imparted, and the use of a foamed resin sheet having an expansion ratio of 25 to 40 times is particularly preferable. Further, the thickness of the foamed resin sheet can be appropriately selected within a range in which buffering properties can be obtained, but it is particularly preferable to use a foamed resin sheet having a thickness of 0.5 mm to 2.0 mm.
また上記緩衝シート層２に使用する発泡樹脂シートの圧縮率に関しては、圧縮率を95％〜99.9％(より好ましくは96.5〜99.5％)の範囲とするのが好ましい。なお圧縮率が95％を大きく下回ると紙基材層１にかかる負荷が過大になり、また圧縮率が99.9％よりも大きくなると紙基材層１に対する充分な追従効果が得られなくなる。 The compression rate of the foamed resin sheet used for the buffer sheet layer 2 is preferably in the range of 95% to 99.9% (more preferably 96.5 to 99.5%). If the compression rate is much lower than 95%, the load applied to the paper base material layer 1 becomes excessive, and if the compression rate is higher than 99.9%, a sufficient follow-up effect for the paper base material layer 1 cannot be obtained.
また上記緩衝シート層２を構成する発泡樹脂シートに関しては、湿度変化により伸縮が起き易い紙基材層１のＣＤ方向(抄紙機の進行方向に直角な方向、横目)に圧縮させるのが好ましい。また更に発泡樹脂シートは、紙の伸縮によって折れ目等が生じ易い封筒の幅方向に圧縮させるのが好ましい。 Further, the foamed resin sheet constituting the buffer sheet layer 2 is preferably compressed in the CD direction (direction perpendicular to the advancing direction of the paper machine, horizontal direction) of the paper base material layer 1 that tends to expand and contract due to a change in humidity. Furthermore, it is preferable that the foamed resin sheet is compressed in the width direction of the envelope, where folds or the like are likely to occur due to expansion and contraction of paper.
[６]紙基材層と緩衝シート層の貼合せについて
また上記紙基材層１と緩衝シート層２の貼合せに関しては、本実施形態では紙基材層１の接合面に厚さ15μｍ程度のポリエチレンコーティング層を形成して、このコーティング層と緩衝シート層２を構成する発泡樹脂シートとを熱により貼り合わせているが、貼合せ方法としては、これ以外の方法、例えば、接着剤や粘着剤による貼合せや熱接着シートによる貼合せ等を採用することもできる。
[6] Regarding the bonding of the paper base layer and the buffer sheet layer Further, regarding the bonding of the paper base layer 1 and the buffer sheet layer 2, in this embodiment, the thickness of the bonding surface of the paper base layer 1 is about 15 μm. The polyethylene coating layer is formed, and this coating layer and the foamed resin sheet constituting the buffer sheet layer 2 are bonded together by heat. As a bonding method, for example, an adhesive or an adhesive is used. Bonding with an agent or bonding with a thermal adhesive sheet can also be employed.
[７]樹脂フィルム層について
また上記樹脂フィルム層３の材料については、密閉機能や防水機能が得られる樹脂材料であれば、高密度ポリエチレンやその他のポリオレフィン系樹脂、ポリスチレンなどを使用することができる。また上記樹脂フィルム層３の厚さに関しては、発泡樹脂シートの圧縮によりシワが入った状態、または撓んだ状態となる範囲で適宜選択することができ、特に厚さ10〜30μｍの樹脂フィルムの使用が好ましい。
[7] Resin film layer As for the material of the resin film layer 3, high-density polyethylene, other polyolefin-based resins, polystyrene, and the like can be used as long as the sealing material and the waterproof function are obtained. . In addition, the thickness of the resin film layer 3 can be appropriately selected within a range where wrinkles are caused by compression of the foamed resin sheet, or in a bent state. Use is preferred.
[８]緩衝シート層と樹脂フィルム層の貼合せについて
また上記緩衝シート層２と樹脂フィルム層の貼合せに関しては、本実施形態では緩衝シート層２と樹脂フィルム層３とを直接熱で貼り合わせているが、貼合せ方法としては、これ以外の方法、例えば、接着剤や粘着剤による貼合せや熱接着シートによる貼合せ等を採用することもできる。
[8] Bonding of buffer sheet layer and resin film layer In addition, regarding the bonding of the buffer sheet layer 2 and the resin film layer, in this embodiment, the buffer sheet layer 2 and the resin film layer 3 are bonded directly by heat. However, as a laminating method, other methods such as laminating with an adhesive or a pressure-sensitive adhesive or laminating with a thermal adhesive sheet can also be employed.
「包装シートの製造方法(１)」
次に上記包装シートの製造方法について説明する。まず図２に示すようにポリエチレンコーティング層が形成された紙基材と、樹脂フィルム付きの発泡樹脂シートをそれぞれ熱風で加熱した状態で圧着ローラＲ・Ｒに引き込む。そして、圧着ローラＲ・Ｒにより発泡樹脂シートを面方向に圧縮させながら紙基材に貼り付ける。具体的には、圧着ローラＲ・Ｒ同士の隙間や配置を工夫する(例えばニップ圧を低くする)ことにより発泡樹脂シートを圧縮させた状態で貼り付けることが可能となる。
"Method for manufacturing packaging sheet (1)"
Next, the manufacturing method of the said packaging sheet is demonstrated. First, as shown in FIG. 2, the paper base material on which the polyethylene coating layer is formed and the foamed resin sheet with the resin film are drawn into the pressure rollers R and R while being heated with hot air. Then, the foamed resin sheet is affixed to the paper substrate while being compressed in the surface direction by the pressure rollers R and R. Specifically, it is possible to apply the foamed resin sheet in a compressed state by devising the gap or arrangement between the pressure-bonding rollers R and R (for example, lowering the nip pressure).
また上記紙基材と発泡樹脂シートとを熱圧着により貼り付ける方法としては、高温の圧着ローラで挟み込む方法を採用することもでき、その場合には、発泡樹脂シートや樹脂フィルム層が熱による悪影響を受けないように紙基材側の圧着ローラのみを加熱して熱圧着を行うのが好ましい。 In addition, as a method of attaching the paper base material and the foamed resin sheet by thermocompression bonding, a method of sandwiching with a high-temperature pressure-bonding roller can be adopted. In that case, the foamed resin sheet or the resin film layer is adversely affected by heat. It is preferable to carry out thermocompression bonding by heating only the pressure roller on the paper substrate side so as not to receive heat.
「包装シートの製造方法(２)」
また包装シートの製造方法としては、上記圧着ローラによる貼り合わせ以外の方法を採用することもでき、具体的には、発泡樹脂シートを冷却により収縮させた状態で紙基材に貼り付け、その後、発泡樹脂シートを常温に戻すことで、発泡樹脂シートを面方向に圧縮させた状態で紙基材に貼り合わせることもできる。
"Method for manufacturing packaging sheet (2)"
Moreover, as a manufacturing method of a packaging sheet, it is also possible to adopt a method other than pasting by the above-mentioned pressure roller, specifically, pasting the foamed resin sheet to a paper substrate in a contracted state by cooling, By returning the foamed resin sheet to room temperature, the foamed resin sheet can be bonded to the paper substrate in a compressed state in the surface direction.
『第二実施形態』
「包装シート及び封筒の構成」
[１]封筒用包装シート及び封筒の基本構成について
次に本発明の第二実施形態について図３に基づいて以下に説明する。本実施形態では、紙基材層１の片面に緩衝シート層２を積層一体化して包装シートＳを構成すると共に、この包装シートＳの紙基材層１を外側、緩衝シート層２を内側に向けて緩衝機能付き封筒を構成している(図示せず)。これにより第一実施形態と同様、紙基材層１に対して緩衝シート層２を追従させることができるため、湿度変化のある環境で使用された場合でも封筒の外観の悪化を抑制できる。なお紙基材層１や緩衝シート層２の条件及び製造方法については、第一実施形態と同様である。
“Second Embodiment”
“Composition of packaging sheet and envelope”
[1] Basic Configuration of Envelope Packaging Sheet and Envelope Next, a second embodiment of the present invention will be described below with reference to FIG. In this embodiment, the buffer sheet layer 2 is laminated and integrated on one side of the paper base layer 1 to form the packaging sheet S, and the paper base layer 1 of the packaging sheet S is on the outside and the buffer sheet layer 2 is on the inside. An envelope with a shock absorbing function is formed (not shown). Thereby, since the buffer sheet layer 2 can be made to follow the paper base material layer 1 as in the first embodiment, deterioration of the envelope appearance can be suppressed even when used in an environment with a change in humidity. In addition, about the conditions and manufacturing method of the paper base material layer 1 and the buffer sheet layer 2, it is the same as that of 1st embodiment.
[効果の実証試験]
次に本発明の効果の実証試験について説明する。まず本試験では、製造条件(発泡樹脂シートの圧縮率)の異なる複数のサンプル(下記実施例１〜３並びに比較例１〜３)を作製し、これらの各サンプルについて、湿度変化のある環境に放置した上でサンプルの外観がどのように変化するかを観察した。以下に実施例１〜３並びに比較例１〜３の各サンプルの製造条件について記載する。
[Effectiveness test]
Next, a verification test of the effect of the present invention will be described. First, in this test, a plurality of samples (Examples 1 to 3 and Comparative Examples 1 to 3 below) having different production conditions (compression ratio of the foamed resin sheet) are prepared, and each of these samples is placed in an environment with a change in humidity. It was observed how the appearance of the sample changed after standing. Below, it describes about the manufacturing conditions of each sample of Examples 1-3 and Comparative Examples 1-3.
「実施例１」
この実施例１では、紙基材層に目付量75g/m2のクラフト紙を使用し、緩衝シート層に厚さ1mm、発泡倍率30倍の低密度ポリエチレンから成る発泡樹脂シートを使用して、発泡樹脂フィルム(厚さ15μｍ、高密度ポリエチレン製)付きの発泡樹脂シートを面方向に圧縮させた状態で紙基材層に貼り付けて包装シートを作製した。なお緩衝シート層を構成する発泡樹脂シートの圧縮率は96.7％であった。
"Example 1"
In Example 1, kraft paper having a basis weight of 75 g / m 2 is used for the paper base layer, and a foamed resin sheet made of low-density polyethylene having a thickness of 1 mm and a foaming ratio of 30 times is used for the buffer sheet layer. A foamed resin sheet with a foamed resin film (thickness 15 μm, made of high-density polyethylene) was applied to the paper base material layer in a state of being compressed in the surface direction to prepare a packaging sheet. The compression ratio of the foamed resin sheet constituting the buffer sheet layer was 96.7%.
「実施例２」
この実施例２では、紙基材層に目付量75g/m2のクラフト紙を使用し、緩衝シート層に厚さ1mm、発泡倍率30倍の低密度ポリエチレンから成る発泡樹脂シートを使用して、発泡樹脂フィルム(厚さ15μｍ、高密度ポリエチレン製)付きの発泡樹脂シートを面方向に圧縮させた状態で紙基材層に貼り付けて包装シートを作製した。なお緩衝シート層を構成する発泡樹脂シートの圧縮率は98.5％であった。
"Example 2"
In Example 2, kraft paper having a basis weight of 75 g / m 2 is used for the paper base layer, and a foamed resin sheet made of low-density polyethylene having a thickness of 1 mm and a foaming ratio of 30 times is used for the buffer sheet layer. A foamed resin sheet with a foamed resin film (thickness 15 μm, made of high-density polyethylene) was applied to the paper base material layer in a state of being compressed in the surface direction to prepare a packaging sheet. The compression ratio of the foamed resin sheet constituting the buffer sheet layer was 98.5%.
「実施例３」
この実施例３では、紙基材層に目付量75g/m2のクラフト紙を使用し、緩衝シート層に厚さ1mm、発泡倍率30倍の低密度ポリエチレンから成る発泡樹脂シートを使用して、発泡樹脂フィルム(厚さ15μｍ、高密度ポリエチレン製)付きの発泡樹脂シートを面方向に圧縮させた状態で紙基材層に貼り付けて包装シートを作製した。なお緩衝シート層を構成する発泡樹脂シートの圧縮率は99.4％であった。
"Example 3"
In Example 3, a kraft paper having a basis weight of 75 g / m 2 is used for the paper base layer, and a foamed resin sheet made of low-density polyethylene having a thickness of 1 mm and an expansion ratio of 30 times is used for the buffer sheet layer. A foamed resin sheet with a foamed resin film (thickness 15 μm, made of high-density polyethylene) was applied to the paper base material layer in a state of being compressed in the surface direction to prepare a packaging sheet. The compression ratio of the foamed resin sheet constituting the buffer sheet layer was 99.4%.
「比較例１」
この比較例１では、紙基材層に目付量75g/m2のクラフト紙を使用し、緩衝シート層に厚さ1mm、発泡倍率30倍の低密度ポリエチレンから成る発泡樹脂シートを使用して、発泡樹脂フィルム(厚さ15μｍ、高密度ポリエチレン製)付きの発泡樹脂シートを圧縮せずに紙基材層に貼り付けて包装シートを作製した。なお緩衝シート層を構成する発泡樹脂シートの圧縮率は100％であった。
"Comparative Example 1"
In Comparative Example 1, kraft paper with a basis weight of 75 g / m 2 is used for the paper base layer, and a foamed resin sheet made of low-density polyethylene with a thickness of 1 mm and a foaming ratio of 30 times is used for the buffer sheet layer. A foamed resin sheet with a foamed resin film (thickness 15 μm, made of high-density polyethylene) was attached to the paper base layer without compression to produce a packaging sheet. The compression ratio of the foamed resin sheet constituting the buffer sheet layer was 100%.
「比較例２」
この比較例２では、紙基材層に目付量75g/m2のクラフト紙を使用し、緩衝シート層に厚さ1mm、発泡倍率30倍の低密度ポリエチレンから成る発泡樹脂シートを使用して、発泡樹脂フィルム(厚さ15μｍ、高密度ポリエチレン製)付きの発泡樹脂シートを伸張させた状態で紙基材層に貼り付けて包装シートを作製した。なお緩衝シート層を構成する発泡樹脂シートの圧縮率は100.5％であった。
“Comparative Example 2”
In Comparative Example 2, kraft paper with a basis weight of 75 g / m 2 is used for the paper base layer, and a foamed resin sheet made of low-density polyethylene with a thickness of 1 mm and an expansion ratio of 30 times is used for the buffer sheet layer. A foamed resin sheet with a foamed resin film (thickness 15 μm, made of high-density polyethylene) was attached to the paper base layer in a stretched state to produce a packaging sheet. The compression rate of the foamed resin sheet constituting the buffer sheet layer was 100.5%.
「比較例３」
この比較例３においては、紙基材層に目付量75g/m2のクラフト紙を使用し、緩衝シート層に厚さ1mm、発泡倍率30倍の低密度ポリエチレンから成る発泡樹脂シートを使用して、発泡樹脂フィルム(厚さ15μｍ、高密度ポリエチレン製)付きの発泡樹脂シートを伸張させた状態で紙基材層に貼り付けて包装シートを作製した。なお緩衝シート層を構成する発泡樹脂シートの圧縮率は102.1％であった。
“Comparative Example 3”
In Comparative Example 3, kraft paper having a basis weight of 75 g / m 2 is used for the paper base layer, and a foamed resin sheet made of low-density polyethylene having a thickness of 1 mm and an expansion ratio of 30 times is used for the buffer sheet layer. Then, a foamed resin sheet with a foamed resin film (thickness 15 μm, made of high-density polyethylene) was stretched and attached to the paper substrate layer to produce a packaging sheet. The compression ratio of the foamed resin sheet constituting the buffer sheet layer was 102.1%.
＜試験方法について＞
次に本試験の試験方法について説明する。本試験では、上記実施例１〜３及び比較例１〜３の各サンプルから作製した幅350mm(うち左右のシール幅10mm×2)、高さ305mm(うちフラップの高さ50mm)の封筒を、高湿度試験機を用いて温度25℃、湿度90％の環境に48時間晒した後、室温、湿度50％の環境に戻して封筒の外観の変化を観察した。
<About the test method>
Next, the test method of this test will be described. In this test, an envelope having a width of 350 mm (of which the left and right seal widths are 10 mm × 2) and a height of 305 mm (of which the height of the flap is 50 mm) prepared from the samples of Examples 1 to 3 and Comparative Examples 1 to 3, Using a high-humidity tester, the test piece was exposed to an environment of temperature 25 ° C. and humidity 90% for 48 hours, and then returned to the environment of room temperature 50% humidity to observe changes in the envelope appearance.
＜試験結果について＞
上記試験の結果、比較例２及び３のサンプルから作製した封筒の紙基材表面には大きなシワが生じ、また比較例１のサンプルから作製した封筒の紙基材表面には細かなシワが生じた。それに対し、実施例１〜３のサンプルから作製した封筒の紙基材表面にはシワが生じなかった。以下に、試験結果をまとめた表を記載する。
As a result of the above test, large wrinkles are generated on the surface of the envelope paper base made from the samples of Comparative Examples 2 and 3, and fine wrinkles are generated on the surface of the paper base of the envelope prepared from the sample of Comparative Example 1. It was. On the other hand, wrinkles did not occur on the paper substrate surface of the envelopes produced from the samples of Examples 1 to 3. Below is a table summarizing the test results.
１ 紙基材層
２ 緩衝シート層
３ 樹脂フィルム層
Ｓ 発泡樹脂シート
Ｒ 圧着ローラ
1 Paper base layer 2 Buffer sheet layer 3 Resin film layer S Foamed resin sheet R Pressure roller
Claims (5)
前記緩衝シート層(２)に、発泡倍率20倍以上の柔軟な発泡樹脂シートを使用すると共に、当該発泡樹脂シートが面方向に圧縮された状態で紙基材層(１)に貼り付けられていることを特徴とする緩衝機能付き封筒。 In the envelope with a buffer function, in which the buffer sheet layer (2) is laminated and integrated inside the paper base layer (1),
For the buffer sheet layer (2), a flexible foamed resin sheet having an expansion ratio of 20 times or more is used , and the foamed resin sheet is applied to the paper base layer (1) in a compressed state in the surface direction. An envelope with a buffer function,
前記緩衝シート層(２)に、発泡倍率20倍以上の柔軟な発泡樹脂シートを使用すると共に、当該発泡樹脂シートが面方向に圧縮された状態で紙基材層(１)に貼り付けられていることを特徴とする封筒用包装シート。 In the envelope packaging sheet in which the buffer sheet layer (2) is laminated and integrated on one side of the paper base layer (1),
For the buffer sheet layer (2), a flexible foamed resin sheet having an expansion ratio of 20 times or more is used , and the foamed resin sheet is applied to the paper base layer (1) in a compressed state in the surface direction. A packaging sheet for envelopes.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01199876A (en) * | 1988-01-20 | 1989-08-11 | Susumu Morita | Manufacture of cushioning sheet |
| JP2009161217A (en) * | 2007-12-29 | 2009-07-23 | Sakai Kagaku Kogyo Kk | Resin envelope, and its manufacturing method |
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2017
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01199876A (en) * | 1988-01-20 | 1989-08-11 | Susumu Morita | Manufacture of cushioning sheet |
| JP2009161217A (en) * | 2007-12-29 | 2009-07-23 | Sakai Kagaku Kogyo Kk | Resin envelope, and its manufacturing method |
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