WO2000026003A1 - Pochette et feuille detachable ameliorees et combinees ainsi que leur procede de production - Google Patents

Pochette et feuille detachable ameliorees et combinees ainsi que leur procede de production Download PDF

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Publication number
WO2000026003A1
WO2000026003A1 PCT/US1998/023453 US9823453W WO0026003A1 WO 2000026003 A1 WO2000026003 A1 WO 2000026003A1 US 9823453 W US9823453 W US 9823453W WO 0026003 A1 WO0026003 A1 WO 0026003A1
Authority
WO
WIPO (PCT)
Prior art keywords
release
film
release sheet
improved
layer
Prior art date
Application number
PCT/US1998/023453
Other languages
English (en)
Inventor
Darrel Loel Wilhoit
James D. Tribble
Original Assignee
Tredegar Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tredegar Corporation filed Critical Tredegar Corporation
Priority to AU13048/99A priority Critical patent/AU1304899A/en
Priority to PCT/US1998/023453 priority patent/WO2000026003A1/fr
Publication of WO2000026003A1 publication Critical patent/WO2000026003A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
    • B29C33/64—Silicone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/68—Release sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/14—Corona, ionisation, electrical discharge, plasma treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state

Definitions

  • the present invention relates to release films and, more specifically, to an improved combination pouch and release film for use in connection with personal hygiene articles, and a method for producing same.
  • Polyolefins and particularly polyethylenes are good base materials for films, coatings and release films. Such materials are easily formulated into films which exhibit desired slip, release, peelability and related characteristics. These films are known in the form of release films applied to adhesive materials, such as removable protective layers for adhesive strips and the like. The protective layer prevents premature adhesion from the strip and protects the covered area from dust, contamination, etc.
  • Polymer blends containing silicone are advantageous in the production of release films.
  • films containing silicone have traditionally suffered from movement of the silicone within the film layers or across layers, also known as "migration".
  • polyolefinic films containing silicone suffer from the tendency for the silicone to migrate from the surface of the film. Since it is the presence of silicone at the surface of the film which imparts desired physical characteristics (e.g. , slip, release) to the film, any movement of the silicone away from the surface diminishes, if not completely removes, such advantageous characteristics.
  • an improved combination pouch and release sheet composed of a silicone-containing embossed polyolefinic material.
  • the film is corona treated to prevent migration of the silicone material within the film. Since the invention avoids the traditional need for a separate release paper and is produced using an in-line process, the combination pouch and release sheet of the present invention exhibits superior performance while being less expensive than such traditional release sheets.
  • the improved combination pouch and release film of the present invention comprises a single- or multiple-layer film.
  • a polyolefinic material containing a silicone component is used as a release material.
  • the release material is extruded or coextruded with at least a polyolefinic film not containing silicone using traditional methods.
  • the film is embossed to impart superior physical and aesthetic characteristics to the film.
  • the release layer is then corona treated to prevent migration of the silicone in release layer.
  • Corona treating the film either prior to or following embossing is contemplated by the combination pouch and release sheet of the present invention.
  • the film is embossed first and then corona treated; however, as previously mentioned, the film can be corona treated at any point, and even at multiple points, of the process. Embossing is accomplished via traditional embossing methods.
  • the improved combination pouch and release film of the present invention is produced by extruding a thin layer of a polyolefinic release material containing a silicone component.
  • the polyolefinic material containing silicone is coextruded onto a base film (preferably of non-silicone-containing polyolefin) to form a film and subsequently treated with a corona discharge. Corona treatment prevents the silicone material from migrating within the film.
  • the film is embossed to enhance the release, tactile and aesthetic characteristics of the resultant film.
  • the corona treatment step can even occur at multiple steps within the process either before and/or after embossing.
  • a release material containing silicone and a base material not containing silicone are coextruded with a base film (also not containing silicone) to form an upper layer (release material), a core layer (base film) and a lower layer (base material).
  • the multilayered film is then preferably embossed.
  • the release material layer is subjected to corona treatment to fix the silicone within the release material.
  • the release material layer can be corona treated to prevent migration of the silicone prior to embossing, and can even be corona treated both prior to and following embossing.
  • the present method features in-line recycling of the process remnants from the film into the core layer, thus providing yet additional cost savings. Remnants from the film of a two layer coextrusion are recycled into the base film.
  • FIGURE 1 is an unembossed, corona treated silicone-containing flat release film; and FIGURE 2 illustrates a two-layer embodiment of the improved combination pouch and release sheet of the present invention.
  • FIGURE 3 illustrates a three-layer embodiment of the improved combination pouch and release sheet of the present invention.
  • a combination pouch and release sheet which exhibits superior physical characteristics, such as low gloss and low noise and improved release, drape and bulk. These superior physical characteristics are due to the unique combination of corona treatment of a silicone-containing film together with embossing of the film before and/or after such corona treatment.
  • the improved combination pouch and release sheet 40 of the present invention is of a two layer construction having a relatively thick (approximately 90% of the total thickness of the film) base film layer 50 and a relatively thin (the remaining approximately 10% of the total thickness) release layer 60.
  • the relatively thick base film layer 50 is preferably constructed of a silicone-free polyolefin polymer, such as a ethylenic homopolmer or copolymer. Mixtures and blends of the foregoing materials may also be used, if desired. Such materials are preferred because they exhibit desired embossing characteristics. These materials are not intended as an exhaustive list of acceptable materials.
  • the silicone present in the relatively thin release layer 60 can be locked into place using corona treatment.
  • An example of a preferred silicone-containing thin release layer 60 material for the improved combination pouch and release sheet 40 of the present invention is a silicone-containing polyethylene known as Bynel 534, available from Dupont Canada.
  • additives such as stabilizers, anti-block and slip agents may be added to the material comprising the base film layer 50.
  • Fillers such as titanium dioxide, mica, calcium, talc and the like, and pigments or dyes may also be added, as desired.
  • the improved combination pouch and release sheet 40 is composed of two or more layers coextruded using traditional methods known in the art. Coextrusion of the two or more layers cojoins the layers by forming a strong bond between the individual layers. Although a multilayered embodiment is preferred, it is noted that a monolayer embodiment extruded using techniques known in the art is also contemplated by the present invention.
  • the coextruded film is subjected to corona treatment to prevent the migration of the silicone material from the polyolefinic material of the thin release layer 60.
  • Corona treatment chemically locks the silicone into the relatively thin release layer 60 through ionic attraction such that migration of the silicone is thereafter prevented. Since it is the presence of the silicone material in the surface of the relatively thin release layer 60 of the film which provides many of the superior physical properties of the improved release sheet, it is important the silicone material remain fixed in the surface and does not travel or otherwise migrate during or after production of the film.
  • the stationary silicone material also provides the resultant release sheet with superior release properties unaffected by time in contact with a pressure sensitive adhesive.
  • Corona treatment may be accomplished using techniques known in the art, such as by passing the film between a grounded cylindrical electrode and an overlying high potential electrode which form an arch over the grounded roll. Embossing of the coextruded multilayered film can be carried out to affect varying degrees of embossing.
  • the resultant improved combination pouch and release sheet 40 exhibits up to 85% less peel force than traditional release sheets, 30-100% more bulk than nonembossed release sheets and superior noise and drape characteristics, both highly important in the personal hygiene product applications, such as pouches for sanitary napkins.
  • another embodiment of the improved combination pouch and release sheet 70 of the present invention comprises three layers.
  • a relatively thin release material layer 80, a relatively thick base film 90 and a relatively thin base material layer 100 comprise this embodiment.
  • the base film layer 90 is analogous to the base film layer 50 of the preferred embodiment described above and is constructed of a silicone-free polyolefin polymer, such as a ethylenic homopolmer or copolymer.
  • the thin release layer 80 is preferably constructed of a material containing silicone. The silicone present in the relatively thin release layer 80 can be locked into place using corona treatment.
  • the silicone-containing polyethylene known as Bynel 534 is a preferred material for the thin release layer 80.
  • embossing technique, additives, extrusion/coextrusion techniques for the three layered embodiment are as described above for the preferred two-layer embodiment.
  • in-line recycling of the process remnants into the core layer of the combination pouch and release sheet (rather than the base film) is accomplished. This feature provides added cost reduction to the resulting combination pouch and release sheet.
  • the above-identified improved combination pouch and release sheet is produced by employing the steps of: preselecting a release material, preferably a polyethylenic material containing silicone which can be locked into place within the surface of the material; preselecting a base film for use with the release material, preferably a polyethylenic material not containing silicone; coextruding a thin layer of the release material containing silicone with a layer of the base film; and subjecting the top layer (release material) to corona treatment to prevent migration of the silicone material either before or after or both before and after embossing the resultant multilayered film to impart superior physical characteristics.
  • a release material preferably a polyethylenic material containing silicone which can be locked into place within the surface of the material
  • preselecting a base film for use with the release material preferably a polyethylenic material not containing silicone
  • coextruding a thin layer of the release material containing silicone with a layer of the base film and subjecting the top layer (release material)
  • a different embodiment of the method of the present invention includes the following steps; preselecting a release material containing silicone; preselecting a base material not containing silicone; preselecting a base film not containing silicone; coextruding the base film between an upper layer of the release material and a lower layer of the base material such that the base film, or core layer, is sandwiched between the upper layer (release layer) and the lower layer (base material); subjecting the upper layer (release material) to corona treatment to prevent migration of the silicone material either before, after or both prior to and following embossing the resultant multilayered film to impart superior physical characteristics.
  • An ideal product category for use of the improved release sheet of the present invention is the personal hygiene industry, including sanitary catamenial pads and the like.
  • the increased bulk, low noise, low gloss and superior drape make the improved release sheet ideal for use as a combination pouch and release sheet for such products.
  • film Samples Nos. 3 and 11 are the same film, prepared using the same production process, except that Sample 3 was left unembossed and Sample 11 was embossed.
  • film Samples Nos. 5 and 13 are identical films, prepared according to the same production process, except that Sample No. 5 was left unembossed and Sample No. 13 was embossed.
  • the samples were then subject to peel strength testing at 180 degrees in accordance with Tribble Release Test Standard. The amount of force necessary to peel the samples was then measured and recorded in grams. Sixteen measurements for each film was recorded.
  • Sample Nos. 11 and 13 demonstrated superior peel strength numbers in that less force was required to peel the embossed film samples, Sample Nos. 11 and 13, than was required with the unembossed samples, Sample Nos. 3 and 5.
  • release values noted above are for films prepared according to the present invention method, except for Sample Nos. 3 and 5, which were not embossed.
  • Traditional films not prepared according to the method of the present invention exhibit peel strength values of approximately 60 grams/in., or approximately three-four times that exhibited by the improved combination pouch and release sheet of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une feuille détachable améliorée (10) combinée à une serviette cataméniale hygiénique. Cette feuille présente des caractéristiques de bruit, d'adaptation à la forme du corps, de volume et d'uniformité supérieures grâce au procédé de production mis en oeuvre. Une matière détachable polyéthylène (20) renfermant de la silicone pouvant être fixée dans la surface de la matière détachable est coextrudée avec au moins un film de base (30) de manière à obtenir un film gaufré afin de produire une pochette et une feuille détachable combinées présentant des caractéristiques physiques supérieures. Le traitement corona de la couche de matière détachable (20) est effectué, de préférence, après le gaufrage, avant le gaufrage ou avant et après le gaufrage dans le but de fixer la silicone dans la surface de la matière détachable. Le recyclage en ligne des matières apporte des avantages supplémentaires liés aux coûts.
PCT/US1998/023453 1998-11-04 1998-11-04 Pochette et feuille detachable ameliorees et combinees ainsi que leur procede de production WO2000026003A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU13048/99A AU1304899A (en) 1998-11-04 1998-11-04 Improved combination pouch and release sheet and method for producing same
PCT/US1998/023453 WO2000026003A1 (fr) 1998-11-04 1998-11-04 Pochette et feuille detachable ameliorees et combinees ainsi que leur procede de production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1998/023453 WO2000026003A1 (fr) 1998-11-04 1998-11-04 Pochette et feuille detachable ameliorees et combinees ainsi que leur procede de production

Publications (1)

Publication Number Publication Date
WO2000026003A1 true WO2000026003A1 (fr) 2000-05-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/023453 WO2000026003A1 (fr) 1998-11-04 1998-11-04 Pochette et feuille detachable ameliorees et combinees ainsi que leur procede de production

Country Status (2)

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AU (1) AU1304899A (fr)
WO (1) WO2000026003A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007117208A1 (fr) * 2006-04-11 2007-10-18 Mölnlycke Health Care Ab Article ou composant de nature médicale et technique pour apposer un article médical ou une partie de celui-ci à la peau, contenant une couche de protection libérable
EP3178653A1 (fr) * 2015-12-10 2017-06-14 S.D. Warren Company D/B/A Sappi North America Produits texturés

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632386A (en) * 1968-10-31 1972-01-04 Arbco Inc Treated silicone surface
US3936582A (en) * 1974-06-03 1976-02-03 Phillips Petroleum Company Differential release coated articles
US4569712A (en) * 1982-11-12 1986-02-11 Sanyo Kokusaku Pulp Co., Ltd. Process for producing support for use in formation of polyurethan films
JPS62209183A (ja) * 1986-03-10 1987-09-14 Nippon Kako Seishi Kk 部分粘着シ−ト
JPS6395285A (ja) * 1986-10-13 1988-04-26 Honshu Paper Co Ltd 離型シ−トの製造方法
JPH0543847A (ja) * 1991-08-13 1993-02-23 Sekisui Chem Co Ltd 両面粘着テープの製造方法
US5302427A (en) * 1990-10-08 1994-04-12 Hoechst Aktiengesellschaft Printable, biaxially oriented polyolefin multilayer film

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632386A (en) * 1968-10-31 1972-01-04 Arbco Inc Treated silicone surface
US3936582A (en) * 1974-06-03 1976-02-03 Phillips Petroleum Company Differential release coated articles
US4569712A (en) * 1982-11-12 1986-02-11 Sanyo Kokusaku Pulp Co., Ltd. Process for producing support for use in formation of polyurethan films
JPS62209183A (ja) * 1986-03-10 1987-09-14 Nippon Kako Seishi Kk 部分粘着シ−ト
JPS6395285A (ja) * 1986-10-13 1988-04-26 Honshu Paper Co Ltd 離型シ−トの製造方法
US5302427A (en) * 1990-10-08 1994-04-12 Hoechst Aktiengesellschaft Printable, biaxially oriented polyolefin multilayer film
JPH0543847A (ja) * 1991-08-13 1993-02-23 Sekisui Chem Co Ltd 両面粘着テープの製造方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8743, Derwent World Patents Index; Class A18, AN 87-301559, XP002106475 *
DATABASE WPI Section Ch Week 8831, Derwent World Patents Index; Class A35, AN 88-215198, XP002106476 *
DATABASE WPI Section Ch Week 9313, Derwent World Patents Index; Class A26, AN 93-104501, XP002106474 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007117208A1 (fr) * 2006-04-11 2007-10-18 Mölnlycke Health Care Ab Article ou composant de nature médicale et technique pour apposer un article médical ou une partie de celui-ci à la peau, contenant une couche de protection libérable
AU2007235708B2 (en) * 2006-04-11 2012-05-24 Molnlycke Health Care Ab Article or component of a medical and technical nature for affixing a medical article or part thereof to skin, provided with a releasable protection layer
US8530022B2 (en) 2006-04-11 2013-09-10 Molnlycke Health Care Ab Article or component of a medical and technical nature for affixing a medical article or part thereof to skin, provided with a releasable protection layer
EP3178653A1 (fr) * 2015-12-10 2017-06-14 S.D. Warren Company D/B/A Sappi North America Produits texturés
WO2017100123A1 (fr) * 2015-12-10 2017-06-15 S.D. Warren Company D/B/A Sappi North America Bandes décollables et produits texturés
US9844906B2 (en) 2015-12-10 2017-12-19 S.D. Warren Company Release webs and textured products
US10350819B2 (en) 2015-12-10 2019-07-16 Sappi North America, Inc. Release webs and textured products

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