EP1010636A1 - Packaging material having mold release function - Google Patents

Packaging material having mold release function Download PDF

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Publication number
EP1010636A1
EP1010636A1 EP98902223A EP98902223A EP1010636A1 EP 1010636 A1 EP1010636 A1 EP 1010636A1 EP 98902223 A EP98902223 A EP 98902223A EP 98902223 A EP98902223 A EP 98902223A EP 1010636 A1 EP1010636 A1 EP 1010636A1
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EP
European Patent Office
Prior art keywords
releasing agent
packaging material
agent layer
releasing
base material
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.)
Withdrawn
Application number
EP98902223A
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German (de)
English (en)
French (fr)
Inventor
Takio Nitto Denko Corporation ITO
Tsuyoshi Nitto Denko Corporation HIRAMATSU
Makoto Nitto Denko Corporation TAKAHASHI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
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Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Publication of EP1010636A1 publication Critical patent/EP1010636A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials

Definitions

  • the present invention relates to a packaging material having a release function which material permits direct packaging of various pressure-sensitive adhesive goods under the state peelable from the goods. More specifically, this invention pertains to a packaging material having a release function which material permits sealing processing (adhesion processing) on the surface of the releasing agent layer.
  • a sanitary napkin (which will hereinafter be called “napkin”) has a pressure-sensitive adhesive layer formed on its surface in order to prevent the slip of it at the time of application.
  • a napkin generally, its pressure-sensitive adhesive layer is protected with a release paper and then the whole napkin is hermetically sealed and individually wrapped with a packaging material such as a plastic film.
  • the opening portion of the packaging material, after the napkin is wrapped, is hermetically sealed by any one of various sealing manners such as heat sealing and press sealing.
  • a pressure-sensitive-adhesive-applied napkin with a packaging material having on the surface thereof a release function, without protecting the pressure-sensitive adhesive layer of the napkin with a release paper.
  • a packaging material having a release function that comprising a base material such as plastic film and a release agent such as silicone type applied to the base material is usually employed.
  • a packaging material in which a releasing agent has been applied not to a portion of a base material to be sealed but only to a portion of the base material in contact with a pressure-sensitive adhesive layer has been proposed.
  • Such a packaging material is however accompanied with the problems that it needs patterned application of the releasing agent, which makes the production process of it more complex and raises the production cost in view of the yield of the product, compared with a packaging material which does not require patterned application of the releasing agent.
  • An object of the present invention is to provide a packaging material having a releasing agent layer formed on the surface of the base material and therefore having a release function, said packaging material having a release function permitting sealing having sufficient adhesive strength even if sealing is carried out on the surface of the releasing agent layer.
  • the present inventors have carried out an extensive investigation. As a result, it has been found that the above-described problems can be solved by producing a packaging material by forming a releasing agent layer on the surface of a stretchable base material, the releasing agent layer being one which forms cracks when the packaging material is stretched; and adjusting, within a predetermined range, the area ratio of crack portions per unit surface area of the releasing agent layer after the packaging material is stretched, leading to the completion of the present invention.
  • the present invention provides a packaging material having a releasing agent layer formed on a stretchable base material, said releasing agent layer forming cracks when the packaging material is stretched and the area ratio of crack portions per unit surface of said releasing agent layer being 10 to 80% after the packaging material is stretched (1st embodiment).
  • the present invention provides the packaging material wherein the area ratio of crack portions per unit surface area of the releasing agent layer at a portion to be sealed is at least 10% (2nd embodiment).
  • the present invention relates to the use of the packaging material having a release function as described in the first embodiment or second embodiment for individual packaging materials for pressure-sensitive adhesive goods (3rd embodiment).
  • FIG. 1 is a cross-sectional view illustrating the state of the packaging material of the present invention having a release function (which will hereinafter be called merely "packaging material") before stretching.
  • the packaging material comprises a base material 1 and a releasing agent layer 2 formed on the entire one side of the base material.
  • the releasing agent layer on the surface of the base material forms a continuous film substantially all over the surface of the base material, as illustrated in FIG. 1, rightly after the releasing agent applied to the surface of the base material is subjected to curing or drying treatment.
  • the subsequent stretching of the packaging material having the above-described constitution cracks appear in the releasing agent layer and the continuity of the film is broken.
  • cracks which appear in the releasing agent layer by the stretching of the packaging material means those minute enough to be recognizable by the observation through a scanning electron microscope (SEM) at x100 to x1000 magnification on the surface of the releasing agent layer of the stretched packaging material, for example, cracks having a diameter of about 10,000 A to 6,500,000 A (angstrom) in the direction vertical to the stretching direction.
  • SEM scanning electron microscope
  • the crack appearing portion (crack portion) of the releasing agent layer On the crack appearing portion (crack portion) of the releasing agent layer, the surface of the base material below the releasing agent layer is exposed or the amount of the releasing agent applied becomes less than that on the other portion of the releasing agent layer.
  • the crack portions appeared in the releasing agent layer make it possible to use the surface of the releasing agent layer as a sealing surface.
  • FIG. 2 is an electron microphotograph (at x300 magnification) of the surface of the releasing agent layer after the stretching of the packaging material of the present invention (draw ratio: 100%), which was observed by SEM.
  • the packaging material of the present invention form cracks in the releasing agent layer when the packaging material is stretched.
  • the area ratio of the crack portions per unit surface area of the releasing agent layer is 10 to 80%, preferably 30 to 70% after the packaging material is stretched.
  • the sealing strength adheresive strength
  • the release function lowers, which makes it impossible to peel the pressure-sensitive adhesive good from the packaging material smoothly.
  • the area ratio of crack portions per unit surface area of the releasing agent layer is determined by analyzing the surface of the releasing agent after stretching of the packaging material by an electron probe microanalyzer, obtaining a color mapping image and subjecting it to image analysis processing.
  • the releasing agent layer is formed of a silicone type releasing agent, fluorine type releasing agent or a long-chain alkyl type releasing agent, Si-K ⁇ beam, F-K ⁇ beam or O-K ⁇ beam strength is measured by an electron beam microanalyzer, respectively and the resulting color mapping image is subjected to image analysis processing.
  • the measuring method of the area ratio of the crack portions per unit surface of the releasing agent layer will next be described more specifically by using a releasing agent layer formed of a silicone type releasing agent as an example.
  • the base material itself is required to be formed of a stretchable material, because, after the formation of the releasing agent layer on the surface of the base material, the packaging material is stretched to form crack portions in the releasing agent layer.
  • the stretchable base material insofar as it has enough stretchability when stretched, as described above, for the formation of crack portions in the releasing agent layer and furthermore, has sufficient mechanical strength as a packaging material even after stretching.
  • the base material itself is required to have sealing properties in heat sealing, press sealing or the like because the packaging material is sealed after the formation of crack portions in the releasing agent layer.
  • the base material comprising a plastic film composed mainly of a polyolefin type thermoplastic film is, for example, preferred.
  • polyethylene polyethylene, polybutene, polyhexene and polyoctene can be used either singly or in combination.
  • polyethylene is particularly preferred.
  • the polyethylene either a single product or blended product of ultra low-density, low-density, linear low-density, medium-density and high-density ones can be used, of which particularly preferred are a blend containing at least 15 wt.% of a linear low-density polyethylene and/or low-density polyethylene or a blend containing 80 wt.% or less of a high-density polyethylene.
  • a material having a higher melting point than a ultra low-density or low-density polyethylene has a melting point of 185°C or less, preferably 110 to 180°C.
  • an elastomer component such as styrene, polyolefin or polyester type preferably in an amount of 40 wt.% or less.
  • ultra low-density, low-density, linear low-density, medium-density or high-density polyethylene polypropylene, ethylene-vinyl acetate copolymer, ethylene-(meth)acrylic acid copolymer, ethylene-methyl (meth)acrylate copolymer, ethylene-ethyl (meth)acrylate copolymer, polyethylene-propylene copolymer, olefin elastomer, styrene elastomer, polyisobutylene and butyl rubber can be used either singly or in combination as a composite resin.
  • olefin elastomer examples include ethylene-propylene rubber (EPT), ethylene-propylene-diene rubber (EPDM), ethylene-propylene elastomer and ethylene-butene elastomer, while those of the styrene elastomer include styrene-isoprene-styrene block copolymer (SIS) and styrene-butadiene-styrene block copolymer (SBS), and hydrogenated products thereof.
  • EPT ethylene-propylene rubber
  • EPDM ethylene-propylene-diene rubber
  • SBS styrene-butadiene-styrene block copolymer
  • the base material may have a single layer structure as described above, but that composed of at least two layers and having, on one side or both sides of one of said layers, a heat sealing layer having a melting point lower by at least 5°C than said layer is preferred because in the latter case, heat sealing can be carried out conveniently and securely.
  • the base material composed of a single layer is presumably perforated by strong heat and it is difficult to control the strength of the heat.
  • the base material composed of at least two layers has an advantage that it is easy to find heat sealing conditions, as a heat sealing layer is present exclusively for heat seal.
  • Examples of such a base material include multi-layered base materials comprising a heat-sealing layer composed of a low-density polyethylene (melting point: 100°C) and a layer composed of high-density polyethylene (melting point: 120°C).
  • the releasing agent layer is disposed on the side of the low-density polyethylene layer serving as a heat sealing layer.
  • a laminate of a non-woven cloth or woven-cloth with a thermoplastic film is also preferred.
  • the packaging material can be provided with high-class feeling by blending with the above-described polymer, thereby roughening the surface of the base material into a pear-skin surface, embossed surface or the like and removing the gloss on the appearance.
  • the blending with the polymer can reduce the dynamic coefficient of friction and is therefore effective for improving the running property in the line.
  • the surface is presumed to become pear-skin or embossed, because when the polymers inferior in compatibility are blended, they are mixed in the separated form owing to the difference in surface tension at the melting time so that uniform mixing cannot be attained at the surface and the surface does not become flat but roughened.
  • the surface roughness is usually 0.2 to 30 ⁇ m, preferably 2 to 5 ⁇ m.
  • the surface roughness is preferably adjusted within the half of the film thickness when the embossed or pear-skin surface is formed by a roll or the like which will be described later.
  • the blending of two polymers different in properties makes it possible to prepare a polymer having only merits of both polymers and therefore is effective for preparing a polymer having a new function, for example, having both functions of flexibility and good nerve.
  • blending with a relatively soft polymer or elastomer lowers the peeling sound upon peeling of the packaging material from the pressure-sensitive adhesive good wrapped therewith, which is effective for preventing others from paying attention to the use of it.
  • the pear-skin or embossed surface can also be formed, for example, by using the roll surface which is in contact with a T-die extruder upon formation of a film.
  • the latter method is more preferred in the case of the formation of the embossed surface.
  • the base material of the present invention it is possible to form at least one side of the multi-layered thermoplastic film to be a pear-skin or embossed surface composed of the above-described polymer blend. Formation of the base material from at least two layers as described above is accompanied with the advantage that properties of the plural polymer films can be combined, leading to the addition of a new function, for example, improvement in the above-described heat sealing property or tear strength and good touch feeling.
  • the base material of the present invention it is possible, for example, to form at least one side of the thermoplastic film to be a pear-skin or embossed surface having surface roughness (Ra) not greater than about the half of the film thickness and to dispose a releasing agent layer on the other side.
  • Ra surface roughness
  • Such a structure is effective for imparting the material with soft touch feeling or high class appearance or improving the running property in the line (decrease in the dynamic coefficient of friction).
  • thermoplastic film As a further embodiment of the base material, it is possible to form at least one side of the thermoplastic film to be a pear-skin or embossed surface having surface roughness (Ra) not greater than about the half of the film thickness and to dispose the releasing agent layer on this side.
  • Ra surface roughness
  • the static coefficient of friction of the pear-skin or embossed surface having the releasing agent layer formed thereon is less than 1.5, preferably 0.2 to 1.0, while its dynamic coefficient of friction is less than 1.2, preferably 0.1 to 1.0.
  • these coefficients satisfy the above ranges, respectively, the running property in the line can be improved and wrinkles, zigzag, breakage and the like are not generated easily upon contact with a roll.
  • the thickness of the base material it is usually not greater than 1 mm, of which 10 to 50 ⁇ m, particularly 20 to 40 ⁇ m, is preferred from the viewpoints of softness and flexibility.
  • the base material needs some extent of strength in view of the transport of it on the line. It is usually preferred that the tensile strength (as measured at 23°C) of the base material in the MD direction is 300 gf/10 mm or greater, particularly 300 to 1000 gf /10 mm and that in the TD direction is 200 gf/10 mm or greater, particularly 300 to 1000 gf/10 mm.
  • the material constituting the releasing agent layer insofar as it permits the formation of cracks in the releasing agent layer when the packaging material is stretched, thereby controlling the area ratio of crack portions within a specific range. From the materials satisfying such properties and having a release function, a proper one can be selected and provided for use.
  • a proper one which can satisfy the above-described properties is selected for use from known releasing agents such as thermosetting, ultraviolet curable and electron beam curable silicone releasing agents, fluorine releasing agents and long-chain alkyl releasing agents (which generally indicate polymers of a long-chain alkyl acrylate having at least 12 carbon atoms, copolymers of a long-chain alkyl acrylate and another vinyl monomer and reaction products available by the reaction between polyvinyl alcohol with a long-chain alkyl component such as long-chain alkyl isocyanate).
  • known releasing agents such as thermosetting, ultraviolet curable and electron beam curable silicone releasing agents, fluorine releasing agents and long-chain alkyl releasing agents (which generally indicate polymers of a long-chain alkyl acrylate having at least 12 carbon atoms, copolymers of a long-chain alkyl acrylate and another vinyl monomer and reaction products available by the reaction between polyvinyl alcohol with a long-chain alkyl component such as long
  • the base material is composed of a thermoplastic film
  • a ultraviolet curable or electron beam curable silicone releasing agent which does not need heating for the formation of the releasing agent layer is preferred.
  • a cation polymerization type ultraviolet curable silicone releasing agent is preferred.
  • the thickness of the releasing agent layer to be formed on the surface of the base material it is usually 0.05 to 4.0 ⁇ m, with 0.1 to 4.0 ⁇ m being preferred and 0.3 to 1.5 ⁇ m being more preferred.
  • the releasing agent can be applied to either one side or both sides of the base material.
  • the releasing agent can be applied to either the entire or partial surface of the base material.
  • crack portions are formed in the releasing agent layer by applying the releasing agent to the surface of the base material, forming the releasing agent layer by drying or subjecting the resulting base material to any one of various curing treatments (for example, ultraviolet ray irradiation or electron beam irradiation) and then stretching the packaging material.
  • various curing treatments for example, ultraviolet ray irradiation or electron beam irradiation
  • stretching method a method selected as needed from known stretching methods ordinarily employed for the stretching of a plastic film such as tentering and rolling can be used.
  • Stretching conditions are not limited particularly. They can be determined so that the area ratio of crack portions of the releasing agent layer formed by the stretching treatment will satisfy a particular range defined by the present invention, though depending on the kind of the base material.
  • the packaging material of the present invention can be stretched prior to sealing.
  • pressure-sensitive adhesive goods are wrapped with the unstretched packaging material, only the portion to be sealed is stretched and crack portions are formed in this portion of the releasing agent layer.
  • the area ratio of the crack portions per unit surface area of the releasing agent layer at the portion to be sealed is at least 10%, preferably 15 to 95%.
  • area ratio per unit surface area of the releasing agent layer at the portion to be sealed means the value obtained by measuring, under the conditions similar to the above, the Si-K ⁇ beam strength on the surface of the releasing agent layer at the portion to be sealed and subjecting the resulting color mapping image to image analysis processing under the conditions similar to the above.
  • stretching and sealing of the packaging material can be carried out simultaneously by passing the portion of the packaging materials to be sealed (the stacked portion of the packaging materials) between two rolls (at least one of these rolls is a heating roll for heat sealing) which are in contact each other while differing in a rotational speed.
  • the shear stress between rolls cracks can be formed in the releasing agent layer of the packaging material.
  • the stretching and sealing of the packaging material can be carried out simultaneously by using a heat sealer having a heat sealing bar having a concave portion (protrusion) formed on its surface.
  • the packaging material is stretched at the concave portion of the heat sealing bar at the time of heat sealing, whereby cracks can be formed in the releasing agent layer of the packaging material.
  • FIGS. 3a and 3b are electron microphotographs (FIG. 3a: x 100 magnification, FIG. 3b: x 300 magnification) of the surface of the releasing agent layer after the packaging material of the present invention was heat sealed and then the sealed portion was peeled off, which was observed be SEM.
  • the packaging material of the present invention can be provided after stretched in advance, that is, after formation of cracks in the releasing agent layer and ready for sealing.
  • the packaging material can also be provided without stretching and after pressure-sensitive adhesive goods are wrapped with such packaging material, stretching is carried out upon sealing to form crack portions in the releasing agent layer.
  • FIG. 4 is an enlarged schematic cross-sectional view of the packaging material of the present invention used as an individual packaging material (packaged sheet) of a napkin with a pressure-sensitive adhesive.
  • the napkin B is wrapped with the unstretched packaging material A. Only the portion C to be sealed which is composed of the releasing agent surfaces of the packaging materials is stretched to form crack portions in the releasing agent layers and then sealed.
  • indicated at 1 is a base material, 2 a releasing agent layer and 3 a pressure-sensitive adhesive layer.
  • the sealing method of the stretched packaging material heat sealing (heat bonding) or press sealing method can be employed for example.
  • the surface of the releasing agent layer having crack portions formed therein is a surface to be sealed.
  • the base material layer below the releasing agent layer has been exposed or an amount of the releasing agent applied has been decreased so that practically sufficient sealing strength (adhesive strength) is available even if the surface of the releasing agent layer is sealed.
  • the surfaces of the packaging material to be sealed may be formed of surfaces of the releasing agent layer of the packaging material or may be formed of the surface of the releasing agent layer and the surface of the base material (for example, a surface opposite to the surface having the releasing agent layer formed thereon).
  • the sealing strength (as measured at 23°C) indicating the adhesive force at the sealed portion is at least 2 g/25 mm but not greater than the breaking strength of the base material, preferably 5 g/25 mm to 1000 g/25 mm.
  • breaking strength of the base material means the strength at which the base material does not peel from the sealed portion but is broken upon measurement of the sealing strength. It suggests that the adhesive strength at the sealed portion is markedly strong. When the sealing strength is less than 2 g/25 mm, peeling of the sealed portion occurs easily, indicating the deteriorating tendency of the seal retention.
  • the packaging material of the present invention can be used not only as an individual packaging material for a pressure-sensitive-adhesive-applied sanitary napkin, as illustrated in FIG. 4, but also a material for wrapping various pressure-sensitive adhesive goods such as pressure-sensitive-adhesive-applied pocket heater without using a release paper.
  • a releasing agent prepared from 100 parts by weight of a cation polymerization type ultraviolet curable silicone releasing agent ("TPR6500”, produced by Toshiba Silicone Co., Ltd.) and 2 parts by weight of a photo initiator ("UV-9310C", produced by Toshiba Silicone Co., Ltd.) was applied to give a thickness of 0.7 ⁇ m.
  • the resulting film was exposed to UV rays to form a releasing agent layer, whereby a packaging material before stretching was prepared.
  • a releasing agent prepared from 100 parts by weight of an addition reaction type thermosetting silicone releasing agent and 2 parts by weight of a platinum curing catalyst was applied to give a thickness of 0.3 ⁇ m.
  • a releasing agent layer was formed in a hot-air drier, whereby a packaging material before stretching was formed.
  • the packaging material before stretching (25 mm wide x 100 mm length), which had been prepared in Referential Example 1, was stretched at a draw ratio of 100% in the direction of the flow of the base material (MD direction). At that time, stretching was carried out at a tensile rate of 50 mm/min by using a tensile tester.
  • the surface of the releasing agent layer was observed by SEM (x 300 magnification). As a result, generation of cracks in the releasing agent layer was observed. It was also found that the area ratio of crack portions per unit surface area of the releasing agent layer was 15% after stretching.
  • Example 2 In a similar manner to Example 1, the packaging material before stretching (25 mm wide x 100 mm length), which had been prepared in Referential Example 1, was stretched at a draw ratio of 150% in the direction of the flow of the base material (MD direction).
  • the surface of the releasing agent layer was observed by SEM (x 300 magnification). As a result, generation of cracks in the releasing agent layer was observed. It was also found that the area ratio of crack portions per unit surface area of the releasing agent layer was 50% after stretching.
  • Example 2 In a similar manner to Example 1, the packaging material before stretching (25 mm wide x 100 mm length), which had been prepared in Referential Example 1, was stretched at a draw ratio of 200% in the direction of the flow of the base material (MD direction).
  • the surface of the releasing agent layer was observed by SEM (x 300 magnification). As a result, generation of cracks in the releasing agent layer was observed. It was also found that the area ratio of crack portions per unit surface area of the releasing agent layer was 75% after stretching.
  • the unstretched packaging materials obtained in Referential Example 1 were stacked such that their surfaces of the releasing agent layers faced each other and then heat sealed by a heat sealer equipped with a heat sealing bar having on the surface thereof convex portions formed.
  • each of the packaging materials was stretched at the convex portions of the heat sealing bar and cracks were formed in the releasing agent layer corresponding to the convex portions, whereby heating sealing providing sufficient sealing strength for practical use was carried out.
  • the sealed portion of one of the packaging materials was peeled and the area ratio of the crack portions per unit surface area of the releasing agent layer at the sealed portion was measured, resulting in 53%.
  • the unstretched packaging material obtained in Referential Example 1 was used as was without stretching. At that time, the area ratio of crack portions per surface unit area of the releasing agent layer was 0%.
  • the unstretched packaging material (25 mm wide x 100 mm length) prepared in Referential Example 1 was stretched at a draw ratio of 50% in the direction of the flow of the base material (MD direction).
  • the surface of the releasing agent layer was observed by SEM (x 300 magnification). As a result, generation of cracks in the releasing agent layer was observed. It was also found that the area ratio of crack portions per unit surface area of the releasing agent layer was 5% after stretching.
  • the unstretched packaging material (25 mm wide x 100 mm length) prepared in Referential Example 1 was stretched at a draw ratio of 300% in the direction of the flow of the base material (MD direction).
  • the surface of the releasing agent layer was observed by SEM (x 300 magnification). As a result, generation of cracks in the releasing agent layer was observed. It was also found that the area ratio of crack portions per unit surface area of the releasing agent layer was 85% after stretching.
  • the unstretched packaging material (25 mm wide x 100 mm length) prepared in Referential Example 1 was stretched at a draw ratio of 100% in the direction of the flow of the base material (MD direction).
  • the packaging materials of each sample were stacked such that their surfaces of the releasing agent layers faced each other and then heat sealed by a heat sealer ("TP-701S HEAT SEAL TESTER, TESTER SANGYO CO. LTD) under the below-described conditions. After heat sealing, heat sealing strength was measured at a tensile rate of 300 mm/min (T type peeling test) by making use of a tensile tester.
  • the heat sealing bar of the heat sealer employed in the above evaluation had a flat shape.
  • a pressure-sensitive adhesive tape (trade name: "F-140BK", produced by NITTO DENKO CORPORATION) was adhered onto the surface of the releasing agent layer of each sample (10 mm wide) by the reciprocation of a 2 kg roller and it was allowed to stand for 30 minutes at room temperature.
  • the area ratio of crack portions exceeds 80%, that is, higher than the value defined in this invention, so that the releasing agent layer has lowered peeling property from the pressure-sensitive adhesive tape.
  • the above-described structure of the packaging material of the present invention having a release function makes it possible to carry out sealing with sufficient adhesive strength even if the surfaces of the releasing agent layers are sealed each other, and at the same time to maintain sufficient peeling property from various pressure-sensitive adhesive goods.
  • a packaging material according to the present invention By using a packaging material according to the present invention, it becomes possible to produce a packaging material having a release function without a conventionally-employed complex production step of applying a releasing agent to the portions other than the portion to be sealed.
  • the step for forming crack portions in the releasing agent layer can be carried out simultaneously with sealing so that it is not necessary to stretch the packaging material in advance and working efficiency of sealing can be improved further.
EP98902223A 1997-02-18 1998-02-13 Packaging material having mold release function Withdrawn EP1010636A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3352697 1997-02-18
JP03352697A JP3836558B2 (ja) 1997-02-18 1997-02-18 離型機能を有する包装材料
PCT/JP1998/000604 WO1998035884A1 (fr) 1997-02-18 1998-02-13 Materiau d'emballage a fonction de demoulage

Publications (1)

Publication Number Publication Date
EP1010636A1 true EP1010636A1 (en) 2000-06-21

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EP98902223A Withdrawn EP1010636A1 (en) 1997-02-18 1998-02-13 Packaging material having mold release function

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EP (1) EP1010636A1 (ja)
JP (1) JP3836558B2 (ja)
KR (1) KR20000071143A (ja)
CN (1) CN1252771A (ja)
TW (1) TW382611B (ja)
WO (1) WO1998035884A1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000079963A (ja) * 1998-09-03 2000-03-21 Shiseido Co Ltd 吸収性物品の個別包装
DE10007942A1 (de) * 2000-02-22 2001-09-06 Lohmann Therapie Syst Lts Verpackung für wirkstoffhaltige Pflaster
JP4736164B2 (ja) * 2000-08-10 2011-07-27 大日本印刷株式会社 電池用積層フィルムおよびそれを用いた電池用容器
JP3668439B2 (ja) * 2001-06-14 2005-07-06 ソニーケミカル株式会社 接着フィルム
KR200455349Y1 (ko) * 2009-09-11 2011-08-31 우진프라콤(주) 쌀겨를 함유한 시트 및 이를 이용한 선물세트용 트레이

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Publication number Priority date Publication date Assignee Title
JPH0324949A (ja) * 1989-06-23 1991-02-01 Dainippon Printing Co Ltd 剥離テープおよび該剥離テープが貼着されている生理用ナプキン
JPH04284237A (ja) * 1991-03-12 1992-10-08 Dainippon Printing Co Ltd 生理用ナプキンの個別包装体用包装材料およびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9835884A1 *

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Publication number Publication date
JPH10230964A (ja) 1998-09-02
JP3836558B2 (ja) 2006-10-25
WO1998035884A1 (fr) 1998-08-20
TW382611B (en) 2000-02-21
KR20000071143A (ko) 2000-11-25
CN1252771A (zh) 2000-05-10

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