JPH04179545A - Preparation of heat-sealable air permeable packing material - Google Patents
Preparation of heat-sealable air permeable packing materialInfo
- Publication number
- JPH04179545A JPH04179545A JP2309934A JP30993490A JPH04179545A JP H04179545 A JPH04179545 A JP H04179545A JP 2309934 A JP2309934 A JP 2309934A JP 30993490 A JP30993490 A JP 30993490A JP H04179545 A JPH04179545 A JP H04179545A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- base material
- resin powder
- roll
- heat
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 46
- 238000012856 packing Methods 0.000 title 1
- 239000000057 synthetic resin Substances 0.000 claims abstract description 49
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 48
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000005022 packaging material Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000035699 permeability Effects 0.000 abstract description 24
- -1 polyethylene Polymers 0.000 abstract description 11
- 239000004698 Polyethylene Substances 0.000 abstract description 5
- 229920000573 polyethylene Polymers 0.000 abstract description 5
- 229920002379 silicone rubber Polymers 0.000 abstract description 3
- 239000004945 silicone rubber Substances 0.000 abstract description 3
- 239000000123 paper Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000004745 nonwoven fabric Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ヒートシール性及び通気性が要求される包装
材料の製造方法に関するものである。通気性を要求され
る包装材料とは、例えば乾燥剤、脱臭剤、芳香剤、各種
ガスの吸収剤の袋素材等に供するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing packaging materials that require heat-sealability and air permeability. Packaging materials that require air permeability include, for example, those used as bag materials for desiccants, deodorizers, fragrances, and absorbents for various gases.
（従来の技術）
従来、ヒートシール性及び通気性を有した包装材料を製
造するには、以下のような方法が用いられてきた。(Prior Art) Conventionally, the following methods have been used to produce packaging materials with heat sealability and air permeability.
例えば耐熱性、通気性を有する紙、不織布等の基材にポ
リエチレン等のヒートシール性を有する合成樹脂を積層
した後、針又はピン状の突起を表面に有した加熱ロール
を用いて基材上の合成樹脂を部分的に溶融して通気孔を
穿設する方法（特公昭４６−３１４７６号公報）、又あ
らかじめ針又はピン状の突起を表面に有する加熱ロール
を用いて有孔合成樹脂フィルムを製造し、これを前記紙
、不織布等の基材に熱圧着して積層する方法（特公昭４
７−６５１８号公報）がある。For example, after laminating a heat-sealable synthetic resin such as polyethylene on a heat-resistant, breathable base material such as paper or non-woven fabric, a heating roll with needle or pin-like protrusions on the surface is used to coat the base material. There is also a method of forming ventilation holes by partially melting a synthetic resin (Japanese Patent Publication No. 46-31476), and a method of forming a perforated synthetic resin film using a heated roll having needle or pin-like protrusions on the surface in advance. A method of manufacturing and laminating it by thermocompression bonding to the base material such as paper or non-woven fabric (Special Publication Publication No. 4)
7-6518).
（発明が解決しようとする課題）
しかしながらこれらの製造方法においては、フィルムの
積層と通気孔の穿設という２つの工程を必要とするだけ
でなく、包装材料の透気度を調整する場合には、前記加
熱ロール表面上の突起の大きさ又は数を変えて、合成樹
脂フィルムに穿設された通気孔の面積又は数を変えてい
たため、包装材料の用途によって各種の加熱ロールを所
持する必要があるので無駄が生じるという問題があった
。(Problems to be Solved by the Invention) However, these manufacturing methods not only require two steps: laminating films and drilling ventilation holes, but also require two steps to adjust the air permeability of the packaging material. , the area or number of ventilation holes formed in the synthetic resin film was changed by changing the size or number of protrusions on the surface of the heating roll, so it was necessary to have various heating rolls depending on the use of the packaging material. There was a problem that there was a waste of money.
（課題を解決するための手段）
本発明は上記課題を解決するため、散布される合成樹脂
粉末の融点以上の耐熱性を有し、気体透過性の良好なる
通気性基材、例えば紙、不織布等の上に、粒度が２０〜
２００メツシュの合成樹脂粉末を散布量調整可能な散布
装置を用いて散布し、表面の剥離性が良好で表面温度が
合成樹脂粉末の融点以上に加熱されたヒートロールに、
前記通気性基材の合成樹脂粉末散布面を接するようにし
てこのヒートロールを通過させ、合成樹脂粉末を通気性
基材に溶融、圧着させた後、冷却部に前記通気性基材を
通過させることを特徴とする。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention uses a breathable substrate that has heat resistance higher than the melting point of the synthetic resin powder to be sprayed and has good gas permeability, such as paper or nonwoven fabric. etc., the particle size is 20~
200 mesh synthetic resin powder was sprayed using a spraying device with adjustable spraying amount, and the heat roll was heated to a surface temperature higher than the melting point of the synthetic resin powder with good surface releasability.
The synthetic resin powder sprayed surface of the breathable base material is passed through this heat roll so as to be in contact with the synthetic resin powder, and the synthetic resin powder is melted and pressed onto the breathable base material, and then the breathable base material is passed through the cooling section. It is characterized by
二二で気体透過性の良好なる紙、不織布等の通気性基材
とは、ＪＩＳ Ｐ ８１１７ （紙及び板紙の透気度試
験法）にて規定される透気度が１００秒／１００ ｃｃ
以下であり、パルプ、レーヨン、ポリエチレンテレフタ
レート、ポリアミド、ポリプロピレン、ポリエチレン等
から選ばれた１種または２種以上の材質で構成されてい
るものである。基材の上に散布される合成樹脂粉末はポ
リエチレン、ポリプロピレン、エチレン酢酸ビニール共
重合体等のヒートシール性を有する合成樹脂で、その粒
度は２０〜２００メツシュの範囲から選ばれる。樹脂粉
末の粒度が２０メツシュ以上の大きさであれば、樹脂と
ヒートロールと接触する表面積が小さいため接触時間内
に完全に溶融ができず、基材に固着しないだけでなく弾
性ロールを用いてプレスする場合に基材に傷を付けやす
い。又樹脂粉末が２００メツシュ以下の小さい粒度のも
のであれば、粉末粒子の重量が軽いために、散布時に発
生する静電気の影響を受け、樹脂粉末が舞い上がって粉
末粒子が互いに結合してしまうので、散布を均一に行う
ことができないだけでなく、基材が薄い場合には基材の
細孔を粉末粒子が通過してしまうため、均一に散布する
ことができない。Air permeable substrates such as paper and nonwoven fabrics that have good gas permeability in 22 are those with an air permeability of 100 seconds/100 cc as defined in JIS P 8117 (Air permeability test method for paper and paperboard).
It is made of one or more materials selected from pulp, rayon, polyethylene terephthalate, polyamide, polypropylene, polyethylene, etc. The synthetic resin powder sprinkled on the substrate is a synthetic resin having heat-sealing properties such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc., and its particle size is selected from the range of 20 to 200 mesh. If the particle size of the resin powder is 20 mesh or more, the surface area of contact between the resin and the heat roll is small, so it cannot be completely melted within the contact time, and it will not only not stick to the base material but also be difficult to melt using the elastic roll. It is easy to damage the base material when pressing. Also, if the resin powder has a small particle size of 200 mesh or less, the weight of the powder particles is light, so the resin powder will fly up due to the influence of static electricity generated during spraying, and the powder particles will bond with each other. Not only is it not possible to spread the powder uniformly, but also if the base material is thin, the powder particles will pass through the pores of the base material, making it impossible to spread the powder uniformly.
又ヒートロールの表面には剥離性のあることが必要であ
るが、このために剥離性のある樹脂を被覆すると好適で
ある。そして剥離性のある樹脂とは、凝集エネルギーが
、５０ ｃａｌ／ｃＴＩ以下のものが好ましく、代表的
材質としてシリコン、ポリ四フッ化エチレンがある。Furthermore, the surface of the heat roll must have releasability, and for this purpose it is preferable to coat it with a resin that has releasability. The removable resin preferably has a cohesive energy of 50 cal/cTI or less, and representative materials include silicon and polytetrafluoroethylene.
（作用）
合成樹脂粉末は、散布量調整可能な散布装置によって通
気性基材上に散布され、合成樹脂の融点以上に加熱され
たヒートロールと接触することにより通気性基材の上で
溶融する。溶融した合成樹脂粉末は通気性基材に圧着さ
れるが、ヒートロール表面は剥離性を有するため、溶融
した合成樹脂が通気性基材からヒートロール表面に転移
することはない。合成樹脂粉末の圧着後、通気性基材が
冷却部を通過すると、合成樹脂粉末が通気性基材上で斑
状に均一分布されて固化し、ヒートシール性を持った通
気包装材料が完成する。合成樹脂が固着した部分は通気
性がなく、合成樹脂が固着していない部分は通気性が確
保されることになり、又散布装置の合成樹脂粉末散布量
を調整することにより、任意の透気度を有したヒートシ
ール性通気包装材料を得ることができる。(Function) The synthetic resin powder is spread onto the breathable base material using a spraying device that can adjust the amount of spraying, and is melted on the breathable base material when it comes into contact with a heat roll heated above the melting point of the synthetic resin. . The molten synthetic resin powder is pressed onto the air-permeable base material, but since the heat roll surface has releasable properties, the molten synthetic resin does not transfer from the air-permeable base material to the heat roll surface. After the synthetic resin powder is crimped, when the air-permeable base material passes through the cooling section, the synthetic resin powder is uniformly distributed in patches on the air-permeable base material and solidified, completing a breathable packaging material with heat-sealability. The parts to which the synthetic resin has adhered have no air permeability, while the parts to which the synthetic resin has not adhered have air permeability.Also, by adjusting the amount of synthetic resin powder sprayed by the spraying device, any air permeability can be achieved. It is possible to obtain a heat-sealable breathable packaging material with a high degree of heat sealability.
（実施例） 図は本発明の一実施例の工程を示している。(Example) The figure shows the steps of an embodiment of the invention.
通気性基材１は繰出しロール１１から繰り出される。合
成樹脂粉末５を散布する散布装置２は直径１２０ｍｍの
回転ロール４をホッパー３の下に設けており、回転制御
装置６によって回転ロール４の回転数を制御している。The breathable base material 1 is fed out from a feeding roll 11. A spreading device 2 for spreading synthetic resin powder 5 has a rotating roll 4 with a diameter of 120 mm provided below a hopper 3, and the rotation speed of the rotating roll 4 is controlled by a rotation control device 6.
温度１８０°Ｃ２直径８００ｍｍのヒートロール７はポ
リ四フフ化エチレン層８を表面に被覆しており、剥離性
を有している。９は溶融した合成樹脂粉末５を通気性基
材１上に圧着する直径１５０＋ａｍのシリコンゴム製の
弾性ロールである。１４は前記溶融した合成樹脂粉末５
を固化させる冷却ロール１０．１０を備えた冷却部であ
り、合成樹脂粉末５固着後の通気性基材１は、ガイドロ
ール１２．１２に導かれ巻取りロール１３に巻き取られ
る。The heat roll 7, which has a temperature of 180°C and a diameter of 800 mm, has a polytetrafluoroethylene layer 8 coated on its surface and has removability. Reference numeral 9 denotes an elastic roll made of silicone rubber and having a diameter of 150+ am, which presses the molten synthetic resin powder 5 onto the air-permeable base material 1. 14 is the molten synthetic resin powder 5
The air-permeable base material 1 with the synthetic resin powder 5 fixed thereon is guided to a guide roll 12.12 and wound up on a winding roll 13.
上記装置において、目付４３ｇ／ｒｒｆ、、透気度１５
秒／１００ｃｃのパルプ質からなる紙基材１は、繰出し
ロール１１より加工速度４０ｍ／分にて繰り出される。In the above device, the basis weight is 43 g/rrf, the air permeability is 15
A paper base material 1 made of pulp material with a speed of 40 m/min is fed out from a feeding roll 11 at a processing speed of 40 m/min.
一方回転ロール４の回転数が１５回／分に調節された散
布装置２からは、融点１１０″Ｃ１粒度６０〜８０メツ
シュのポリエチレンの合成樹脂粉末５が散布量Ｌｏｇ／
ｒｒｆで均一に紙基材１上に散布される。合成樹脂粉末
５はヒートロール７と接触して溶融し、同時にシリコン
ゴム製の弾性ロール８によってプレスさ、れ、紙基材１
上に圧着されるが、前記ヒートロール７は表面が剥離性
を有するため溶融した合成樹脂粉末５がヒートロール７
表面に転移することはない。合成樹脂粉末５の圧着終了
後、前記紙基材１が冷却部１４を通過すると、溶融合成
樹脂粉末５は速やかに冷却されて紙基材１上で固化する
。合成樹脂粉末５が固着した前記紙基材１は、ガイドロ
ール１２．１２を経て巻取りロール１３に巻き取られる
。On the other hand, a polyethylene synthetic resin powder 5 with a melting point of 110"C1 and a particle size of 60 to 80 mesh is sprayed from the spraying device 2 in which the rotation speed of the rotary roll 4 is adjusted to 15 times/min.
It is uniformly scattered on the paper base material 1 by rrf. The synthetic resin powder 5 comes into contact with the heat roll 7 and melts, and is simultaneously pressed by an elastic roll 8 made of silicone rubber to form the paper base material 1.
However, since the heat roll 7 has a peelable surface, the molten synthetic resin powder 5 is pressed onto the heat roll 7.
It does not metastasize to surfaces. When the paper base material 1 passes through the cooling section 14 after the synthetic resin powder 5 is compressed, the molten synthetic resin powder 5 is rapidly cooled and solidified on the paper base material 1. The paper base material 1 to which the synthetic resin powder 5 is fixed is wound onto a winding roll 13 via guide rolls 12,12.
紙基材１上で合成樹脂が固着した部分は通気性がなく、
固着していない部分は通気性が確保される。この場合は
、透気度２４秒／１００ｃｃの製品が得られ、合成樹脂
粉末５の散布量を変えることによって任意の透気度を有
した包装材料が得られる。例えばここで同じ紙基材、合
成樹脂粉末を用い、散布量を２０ｇ／ボに調整すると通
気度７９秒／１００ｃｃの製品、散布量を３０ｇ／ボに
調整すると透気度２４５秒／１００ｃｃの製品が得られ
た。The part of the paper base material 1 where the synthetic resin is fixed has no air permeability.
Air permeability is ensured in the unattached portions. In this case, a product with an air permeability of 24 seconds/100 cc is obtained, and by changing the amount of synthetic resin powder 5 to be sprayed, a packaging material having an arbitrary air permeability can be obtained. For example, if the same paper base material and synthetic resin powder are used here, and the spray amount is adjusted to 20 g/bo, the product has an air permeability of 79 seconds/100 cc, and if the spray amount is adjusted to 30 g/bo, the air permeability is 245 seconds/100 cc. was gotten.
この他通気性基材に目付５０ｇ／ｒ＋（のパルプ５０％
レーヨン５０％からなる不織布、合成樹脂粉末に融点１
２５°Ｃ１粒度６０〜８０メツシュの高密度ポリエチレ
ンを用いるなど、用途に合わせて様々な材料を用いるこ
とができる。In addition, the air permeable base material has a basis weight of 50 g/r+ (50% pulp)
Non-woven fabric made of 50% rayon, synthetic resin powder with melting point of 1
Various materials can be used depending on the purpose, such as using high-density polyethylene with a particle size of 60 to 80 mesh at 25°C.
上記実施例では、合成樹脂粉末の散布装置として合成樹
脂粉末を充填したホッパーの下に回転ロール設置したも
のを用いたが、回転ロールの他にも振動篩、又はそれら
を組み合わせた装置を用いることもできる。In the above example, a rotating roll installed under a hopper filled with synthetic resin powder was used as the synthetic resin powder dispersion device, but in addition to the rotating roll, a vibrating sieve or a device combining these may also be used. You can also do it.
又製品の透気度の調整は合成樹脂粉末の散布量を変える
だけでなく、基材の加工速度を変えることによっても調
整可能である。Furthermore, the air permeability of the product can be adjusted not only by changing the amount of synthetic resin powder sprayed, but also by changing the processing speed of the base material.
（発明の効果）
本発明は上記構成を有するので、包装材料の透過度を調
整するための各種の針又はピン状の突起を有する加熱ロ
ールを複数もつことなく、用途に合わせて任意に透過度
を調整したヒートシール性通気包装材料を、−工程で簡
便に製造することができる。(Effects of the Invention) Since the present invention has the above configuration, it is not necessary to have a plurality of heating rolls having various needle or pin-like protrusions for adjusting the permeability of the packaging material, and the permeability can be adjusted arbitrarily according to the application. A heat-sealable breathable packaging material having an adjusted temperature can be easily produced in a -step.
【図面の簡単な説明】
第１図は本発明の一実施例の工程を示す概略図である。
１−−−−−一・・・−・・・−通気性基材２−−−−
・・−−−−一散布装置
５ ・−−一−−−−−−合成樹脂粉末７− ・−・−
−−−−−−−ヒートロール１０−・−−−・−−−−
−−一一一冷却部代理人 弁理士 石 原 勝BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing the steps of an embodiment of the present invention. 1------1...----Breathable base material 2----
·················································································.
−−−−−−Heat roll 10−・−−−・−−−
−− Masaru Ishihara, Patent Attorney, 111 Cooling Department
Claims (1)
し、気体透過性の良好なる通気性基材の上に、粒度が２
０〜２００メッシュの合成樹脂粉末を散布量調整可能な
散布装置を用いて散布し、表面の剥離性が良好で表面温
度が合成樹脂粉末の融点以上に加熱されたヒートロール
に前記通気性基材の合成樹脂粉末散布面を接するように
してこのヒートロールを通過させ、合成樹脂粉末を通気
性基材に溶融、圧着させた後、冷却部に前記通気性基材
を通過させることを特徴としたヒートシール性通気包装
材料の製造方法。(1) Particle size
A synthetic resin powder of 0 to 200 mesh is sprayed using a spraying device with adjustable spraying amount, and the air-permeable base material is placed on a heat roll with good surface releasability and whose surface temperature is heated to a temperature higher than the melting point of the synthetic resin powder. The synthetic resin powder is passed through the heat roll so that the synthetic resin powder sprayed surfaces are in contact with each other, and the synthetic resin powder is melted and pressed onto the breathable base material, and then the breathable base material is passed through the cooling section. A method for producing a heat-sealable breathable packaging material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2309934A JP2559902B2 (en) | 1990-11-14 | 1990-11-14 | Method for producing heat-sealable breathable packaging material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2309934A JP2559902B2 (en) | 1990-11-14 | 1990-11-14 | Method for producing heat-sealable breathable packaging material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04179545A true JPH04179545A (en) | 1992-06-26 |
| JP2559902B2 JP2559902B2 (en) | 1996-12-04 |
Family
ID=17999110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2309934A Expired - Fee Related JP2559902B2 (en) | 1990-11-14 | 1990-11-14 | Method for producing heat-sealable breathable packaging material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2559902B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5612081A (en) * | 1994-11-25 | 1997-03-18 | Netlon Limited | Applying grit particles to a continuous web |
| US5827608A (en) * | 1996-10-28 | 1998-10-27 | Minnesota Mining And Manufacturing Company | Method of forming a thermoplastic layer on a flexible two-dimensional substrate and powder for preparing same |
| US6355309B1 (en) | 1998-03-11 | 2002-03-12 | 3M Innovative Properties Company | Method of forming a thermoplastic layer on a layer of adhesive |
| US6355135B1 (en) | 1993-01-25 | 2002-03-12 | Daikin Industries, Ltd. | Method of laminating gas permeable sheet material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919153A (en) * | 1982-06-30 | 1984-01-31 | シンタ−・リミテツド | Method and device for manufacturing web-shaped lining cloth coated with plastic |
| JPS6025263A (en) * | 1983-07-21 | 1985-02-08 | Nec Corp | Lead frame |
-
1990
- 1990-11-14 JP JP2309934A patent/JP2559902B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919153A (en) * | 1982-06-30 | 1984-01-31 | シンタ−・リミテツド | Method and device for manufacturing web-shaped lining cloth coated with plastic |
| JPS6025263A (en) * | 1983-07-21 | 1985-02-08 | Nec Corp | Lead frame |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6355135B1 (en) | 1993-01-25 | 2002-03-12 | Daikin Industries, Ltd. | Method of laminating gas permeable sheet material |
| US5612081A (en) * | 1994-11-25 | 1997-03-18 | Netlon Limited | Applying grit particles to a continuous web |
| US5827608A (en) * | 1996-10-28 | 1998-10-27 | Minnesota Mining And Manufacturing Company | Method of forming a thermoplastic layer on a flexible two-dimensional substrate and powder for preparing same |
| US6355309B1 (en) | 1998-03-11 | 2002-03-12 | 3M Innovative Properties Company | Method of forming a thermoplastic layer on a layer of adhesive |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2559902B2 (en) | 1996-12-04 |
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