JP2006315688A - Lid for fragrance-resistant container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid for a fragrance-resistant container for a bathing agent containing a fragrance component or the like by which a sealant layer of the lid is prevented from brittling, and which is free from delamination when the lid is opened, reduction in unsealing strength, or defective appearance which is partly left in a linear shape on a container body. <P>SOLUTION: The lid (A) for the fragrance-resistant container covers an opening part of a container body (B) having a flange part (3) and consisting of a laminate body consisting of a base material layer (1) formed of a single or multi layer film and a seal layer (2) formed of an ionomer on an inner face of the base material layer (1), and is hermetically sealed at the flange part (3). The lid (A) includes at least a laminate of a base material layer (10) consisting of a single or multi layer film and a sealant layer (20) with easy peelability. A polyethylene resin (PE) is used for the sealant layer (20). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lid for a fragrance-resistant container such as a bath agent containing a large amount of fragrance components, and more specifically, in a lid for a fragrance-resistant container such as a bath agent containing a large amount of fragrance components such as linemon and menthol, The adhesive layer or sealant layer of the composite material used for the lid material does not become brittle, the lid material causes delamination at the time of opening, the opening strength decreases due to the brittleness of the sealant layer, and the sealant layer is the container body In particular, the present invention relates to a lid for a fragrance-resistant container that does not have any appearance defects such as being partially left in a string.

  Conventionally, fragrance components such as linemon and menthol contained in bathing agents are rich in volatility, so that the fragrance resistant container is required to have a high barrier property so that the fragrance does not fly, and the material used is not a composite material. However, in the case of a composite material, there is a problem that the fragrance component is adsorbed on an adhesive layer or a sealant layer constituting the composite material and embrittles the material.

  Therefore, for the perfume-resistant container that requires hermetic sealing and peel-opening properties, the lid material causes delamination at the time of opening, the opening strength decreases due to the embrittlement of the sealant layer, and the sealant layer is the container body at the time of peel-opening. There is a problem that a defective appearance such as partly remaining in the shape of a thread occurs.

  Specifically, for example, as shown in FIG. 2, a fragrance container for bathing agents has a container body (B) having a base material layer (1) and a seal made of an ionomer on the inner surface of the base material layer (1). Formed of a laminate provided with a layer (2), the lid (A) is constituted by a laminate comprising a base material layer (10) and a sealant layer (20) having an easy peel property, For the sealant layer (20), an easy peel material of a polymer alloy (a general term for polymer systems in which two or more kinds of polymer chains having different characteristics coexist in one material) is used. The polymer alloy type easy peel material is a normal cohesive fracture type peeling part in which the easy peel material remains thin on the flange (3) by forming a sea-island structure in the polymer and reducing the cohesive force of the polymer. (4) is expressed. For this reason, the polymer film is also brittle and easy to tear.

  However, if the contents containing a large amount of volatile fragrance components such as bathing agents are stored for a long time in the container as described above, the fragrance components are adsorbed on the sealant layer (20), and the sealant layer (20) becomes brittle. End up. In particular, for polymer alloy type easy peel materials, the material design is inherently susceptible to cohesive failure, so that the cohesive force is further reduced due to the adsorption of the fragrance components, and the opening strength is deteriorated. In the case of severe cohesive failure, as shown in FIG. 3, the peeling portion (4) has a double lid shape.

  In addition to the polymer alloy type, there are also easy peel materials to which an adhesive component is added, but the adhesive components are often low molecular weight components, and when packed with perfume ingredients, the low molecular weight components become sticky. The phenomenon will occur.

  Then, there exists a proposal of the delamination type easy peel material (for example, refer patent document 1) using the multilayer EVOH which controlled the ethylene content of ethylene-vinyl alcohol copolymer (EVOH).

Prior art documents are shown below.
Japanese Patent Laid-Open No. 11-5277

  However, such a delamination type requires a contrivance such as scratching the easy peel material or intentionally causing an edge break between the target layers with a ring seal or the like, which takes time and effort in material processing. Moreover, if such a device is not performed, it may not be possible to peel between layers well, and there are many problems such as leading to poor peeling appearance such as stringing, which is incomplete and impractical.

  The present invention is to solve such problems of the prior art, and is used for a lid for a fragrance-resistant container such as a bath agent containing a large amount of fragrance components such as linemon and menthol. The adhesive layer or sealant layer of the composite material does not become brittle, the lid material causes delamination when opened, the opening strength is reduced due to the brittleness of the sealant layer, and a part of the sealant layer remains in the container body as a thread An object of the present invention is to provide a lid member for a fragrance-resistant container that does not cause appearance defects such as.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 of the present invention has a flange portion (3) and is made of at least a single layer or a multilayer film. Covering the opening of the container body (B) made of a laminate in which a layer (1) and a sealing layer (2) made of ionomer are provided on the inner surface of the base layer (1), and sealingly sealing the flange (3) A cover material for a perfume container (A), wherein the cover material (A) includes at least a base material layer (10) made of a single layer or a multilayer film, and a sealant layer (20) having an easy peel property. A lid for a fragrance-resistant container, characterized in that a polyethylene resin (PE) is used for the sealant layer (20).

  The invention according to claim 2 of the present invention is the lid material for a fragrance resistant container according to claim 1, wherein the polyethylene resin (PE) is a linear low density polyethylene resin (L-LDPE) having a density of 0.910 or more. There is a lid material for a fragrance resistant container.

  The invention according to claim 3 of the present invention is the lid for a fragrance-resistant container according to claim 1 or 2, wherein the base material layer (1, 10) is a barrier film. It is a material.

  The lid for a fragrance-resistant container according to the present invention comprises a laminate having a flange portion and at least a base material layer made of a single layer or a multi-layer film and a seal layer made of an ionomer on the inner surface of the base material layer. A lid for a fragrance-resistant container that covers an opening of a container main body and is hermetically sealed to the flange, wherein the lid is at least a base layer made of a single layer or a multilayer film and has an easy peel property By using a linear low density polyethylene resin (L-LDPE) having a density of 0.910 or more for the sealant layer, a fragrance component such as linemon or menthol is used for the lid material. The adhesive layer and sealant layer of the composite material are not embrittled, the lid material causes delamination at the time of opening, the opening strength decreases due to the embrittlement of the sealant layer, and the sealant Layer does not occur like appearance failure such as remaining part thread on the container body.

  An embodiment of the present invention will be described in detail with reference to FIG.

  FIG. 1 is a partial cross-sectional side view of one embodiment for explaining the state of a peeling portion (4) when opening a fragrance-resistant container lid according to the present invention and a container body from the sealed state.

  As shown in FIG. 1, the lid for a fragrance-resistant container according to the present invention (A) has a flange portion (3) and at least a base material layer (1) composed of a single layer or a multilayer film, and the base. A lid for a fragrance-resistant container that covers the opening of a container body (B) made of a laminate having an ionomer sealing layer (2) provided on the inner surface of the material layer (1) and is hermetically sealed to the flange (3) (A) The cover material (A) is composed of a laminate of at least a base material layer (10) made of a single layer or a multilayer film and a sealant layer (20) having an easy peel property.

  The perfume-resistant container lid (A) is required to have heat-sealing properties that completely seal the container body (B), and conversely, easy-peel properties that can be easily opened when opened.

  First, there are various methods of heat sealing techniques for completely sealing and sealing the container main body (B), but the hot plate sealing (bar sealing) method is the most common method. Three conditions of temperature, time, and pressure are fundamental as sealing conditions when performing bar sealing. When heat sealing is performed by the bar seal method, the heat sealing condition corresponding to the heat sealing material (sealant) is selected, and the heat sealing suitability of the sealant is evaluated by the following characteristics.

  First, the seal start temperature is the lowest temperature at which heat sealing is possible, but when the sealant is a single layer film, it is directly related to the softening point and melting point of the sealant. In the case of a multilayer film, the seal initiation temperature is related not only to the melting point of the sealant but also to the thermal conductivity of the other layers. The seal start temperature is determined by increasing the seal temperature according to the reference seal time and pressure and finding a temperature at which sealing is possible. The seal start temperature determined in this way is used for setting the conditions of the packaging machine.

  Next, there are a seal temperature range and a seal time range. The seal temperature range is a temperature range in which heat sealing can be performed with a constant seal time and pressure. The seal start temperature is the lower limit, and the upper limit is the highest temperature at which satisfactory sealing can be performed without deteriorating the quality of the seal part or material. The upper limit of the seal temperature range is related to the melting point of the sealant. The sealing time range is a time range in which heat sealing can be performed at a constant sealing temperature and pressure, and the lower the sealing temperature, the wider. The upper limit of the sealing time is also related to the molecular orientation of the sealant. The thermal stability of the sealant is a factor that determines the upper limit of the sealing time. That is, it is difficult to heat seal a film such as a polymer whose sealing temperature and thermal decomposition temperature are close to each other.

  Next, the hot tack property is called a hot seal property, and is a characteristic representing resistance to peeling of the seal portion immediately after the heat seal bar is removed. If there is no hot tack, the seal part will come off, which may cause a complete uniform seal.

  As described above, the governing factors of the heat seal characteristics of the sealant such as the seal start temperature, the seal temperature range, the hot tack property, and the seal strength are the melting point (in the case of an amorphous polymer, the glass transition point), and the thermal stability. (Heat shrinkage resistance, heat decomposition resistance), thermal fluidity (temperature dependence of melt viscosity and melt viscosity), crystallization rate, and the like.

  The melting point of the polymer is determined by the primary structure of the polymer, and the C—C bond of the molecular chain of the polyethylene resin (PE) is very easy to rotate freely in the dissolved state, so that the heat sealability is good. Thermal stability such as heat shrinkability and heat decomposability is an important factor for widening the heat seal range.

  In heat sealing, the polymer is softened by heat and is compressed in a state where the fluidity is increased, and the polymer molecules are diffused and fused to each other's regions, so that the fluidity of the polymer is given to the heat seal. The impact is great. The fluidity of the molten polymer is related to the molecular weight and crystallinity of the polymer. In the case of the same kind of polymer, when a molecular weight increases, that is, when a polymer having a low melt index (MI) is used, the sealing temperature needs to be increased because the temperature at which the melt viscosity is suitable for sealing increases with the molecular weight. It is. In addition, a polymer having a high degree of crystallinity is softened in the vicinity of the melting point, so that the temperature range in which fluidity suitable for heat sealing is obtained is narrow.

  Other factors that affect the heat sealability include various additives contained in the sealing material. Polymer antioxidants, lubricants and antistatic agents added to improve the slipperiness and chargeability of the film adversely affect the heat sealability. Since these additives have different degrees of influence on the sealing performance depending on the type, it is necessary to select appropriate additives when added to the sealing material. In addition, since corona discharge treatment performed to improve laminating suitability and printability also adversely affects heat sealability, care must be taken so that the corona treatment surface does not become a heat seal surface.

  By the way, since the heat seal characteristic of polyolefin is generally excellent, it is frequently used as a sealant. In the lid for a fragrance-resistant container (A) of the present invention, since an ionomer is used for the seal layer (2) on the inner surface of the container body (B), the easy peel property with the ionomer is taken into consideration. It is preferable to use polyethylene resin (PE) for the sealant layer (20) of the lid material (A).

  The polyethylene resin (PE) is produced by polymerizing ethylene gas obtained by distilling petroleum, and polyethylene (PE) resins having different properties can be obtained depending on the production method. There are low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), high-density polyethylene resin (HDPE), linear low-density polyethylene resin (L-LDPE), etc., all of which are used as sealants.

When classified according to the density (g / cm ³ ) of polyethylene (PE) resin, generally, low density polyethylene resin (LDPE) is 0.910 to 0.929, and medium density polyethylene resin (MDPE) is 0.930 to 0. 0.941, high density polyethylene resin (HDPE) is 0.942 to 0.965, and linear low density polyethylene resin (L-LDPE) is 0.918 to 0.940.

  If classified according to the manufacturing method, it is classified into the high pressure method and the medium / low pressure method. In the high-pressure method, a low-density polyethylene resin (LDPE) is usually produced using a radical polymerization method under a high pressure of 1000 atm or more. On the other hand, the medium / low pressure method produces medium density polyethylene resin (MDPE) and high density polyethylene resin (HDPE) under medium and low pressures of several tens of atmospheres or less. Furthermore, a linear low density polyethylene resin (L-LDPE) is produced by an ion polymerization method.

  Factors governing the properties of these various polyethylene (PE) resins include molecular weight (MI), density (crystallinity), molecular weight distribution, molecular structure and the like. The molecular structure, that is, the difference between the number of branches and the structure affects various physical properties.

  The low density polyethylene resin (LDPE) can be branched in some parts of the main chain, which prevents the regular arrangement of the molecules, and the degree of crystallinity (the polyethylene resin is usually a crystalline part and an amorphous part). The degree of crystallinity) is small (about 60%), so that it has flexibility and good heat sealability, but has a high degree of adsorption of fragrance components and the like.

  Next, as compared with the low density polyethylene resin (LDPE), the medium density polyethylene resin (MDPE) having a small number of branches and a high degree of crystallinity has a low degree of adsorption of fragrance components and the like, but the sealant layer (20). The heat-sealability required for this will deteriorate.

  Next, since the high density polyethylene resin (HDPE) is linear, has few branches, and has a short chain, the degree of crystallinity is considerably large (about 90%), so the degree of adsorption of the fragrance component is very small. However, the heat sealability becomes very poor.

  Next, a linear low density polyethylene resin (L-LDPE) is produced by copolymerization with an α-olefin, and there are branches having a controlled length and number due to the α-olefin. Although it has an intermediate structure between polyethylene resin (LDPE) and high-density polyethylene resin (HDPE), the size of branching differs depending on the type of copolymerization component, so the relationship between density and number of branches is not simple, Since the molecular weight distribution is narrow and the low density component is small, it is less affected by the fragrance component than the low density polyethylene resin (LDPE), and is excellent in heat seal strength, hot tackiness and the like.

  In this way, by using a polyethylene resin (PE) having a relatively high density for the sealant layer (20), a fragrance component such as linemon or menthol is added to the adhesive layer of the composite material used in the lid material (A). The sealant layer does not become brittle, and the lid material causes delamination at the time of opening, the opening strength is reduced due to the brittleness of the sealant layer, and appearance defects such as part of the sealant layer remaining in the form of threads are generated. However, in consideration of heat sealability, it is preferable to use a linear low density polyethylene resin (L-LDPE).

  In particular, a metallocene-based linear low-density polyethylene resin (L-LDPE) polymerized using a metallocene catalyst and having a density of 0.910 or more is more preferable. The linear low density polyethylene resin (L-LDPE) is a polymer having a low low molecular weight, has a low density, and a low heat seal starting temperature.

  By the way, the ionomer is a thermoplastic resin obtained by partially crosslinking a copolymer of ethylene and methacrylic acid with metal ions (sodium, zinc, etc.). The ionomer is excellent in processability because the ionic cross-linking force between molecules loosens and flows easily when heated, and due to the ionic cross-linking structure, various heat sealability, deep drawability, toughness, oil resistance, pinhole resistance, It has excellent characteristics such as transparency.

  In particular, the greatest feature of the ionomer is that it has good heat sealability. That is, when the maximum seal strength, the low temperature seal property, the hot seal property, the foreign matter seal property, the suitable seal temperature range, and the like are evaluated, a high evaluation can be obtained for any item. Among them, the hot sealing property (hot tack property) is good, the melting point is about 20 ° C. lower than that of low density polyethylene resin (LDPE), and the melt viscosity at 200 ° C. or lower is high due to the ionic cross-linking structure. Shows very good hot tack.

  In addition, the ionomer has a hot tack strength of 5 times or more compared to the low density polyethylene resin (LDPE), so it can be said that it is suitable for automatic filling packaging having a peeling force immediately after sealing.

The sealant layer (20) of the lid for a fragrance-resistant container (A) of the present invention is required to have performances in which sealing properties and easy peel properties conflict with each other. In order to facilitate the opening of the lid (A), various easy-open heat-sealing techniques can be applied. The most practical one is a technique using a lid having a peelable sealant. It is. The peelable lid material is based on the peeling mechanism at the time of opening: 1) Interfacial peeling type of the container body-lid material 2) Base material of the lid material-sealant delamination type 3) Cohesive failure type of the sealant of the lid material 3 Can be classified into types.

  The sealant layer (20) of the lid for a fragrance-resistant container of the present invention (A) does not use an easy peel material to which a technique such as a polymer alloy is applied as in the prior art. As shown in FIG. 1, an ionomer is used for the seal layer (2) on the inner surface of B), and a polyethylene resin (PE) is used for the sealant layer (20) of the lid material (A). Since the peeling part (4) between the ionomer and the polyethylene resin (PE) uses the easy peel property due to the interfacial peeling, the adhesive layer of the composite material in which the fragrance component such as linemon or menthol is used for the lid (A) And the sealant layer (20) is not embrittled, the lid material (A) is delaminated at the time of opening, the opening strength is reduced due to the embrittlement of the sealant layer (20), and the sealant layer (20) is a container. Body ( ) Filamentous does not occur like appearance failure such as remaining part, also a simple technique, it spreads the width of such processing.

  Next, since the polyethylene resin (PE) and ionomer described above are easily permeable to gases such as oxygen, carbon dioxide, water vapor, and flavor, they are used for fragrance-resistant containers such as bathing agents that contain a large amount of fragrance components such as linemon and menthol. In the lid (A) and the container body (B), a barrier film should be used for the base layer (1, 10) composed of a single layer or a multilayer film so that the active ingredient is not volatilized outside. Is preferred.

  The barrier film is roughly classified into a barrier resin film, a vapor deposition film, and a metal foil. As the barrier resin film, polyvinyl alcohol (PVA) film, ethylene-vinyl alcohol copolymer (EVOH) film, cellophane, nylon, polyvinylidene chloride (PVDC) film, K coat film (PVDC coated on various base films) KOP, KPET, KNy, etc.). Examples of the deposited film include an aluminum deposited film obtained by vacuum-depositing aluminum on various substrate films and a ceramic deposited film obtained by vacuum-depositing inorganic oxides such as silicon oxide and aluminum oxide. Furthermore, as metal foil, there is an aluminum foil laminated film using an aluminum foil and laminated with various substrate films.

  The polyvinyl alcohol (PVA) film, ethylene-vinyl alcohol copolymer (EVOH) film, cellophane, and nylon have a drawback that the oxygen permeability is small in the dry state but the permeability increases as it absorbs moisture. In addition, polyvinylidene chloride film is taken up as one of the environmental problems because it generates harmful dioxins at the time of incineration and is desired to be replaced.

  Moreover, in the case of the aluminum vapor-deposited film or the aluminum foil laminated film, it is excellent in moisture resistance, oxygen gas barrier property, water vapor barrier property, aroma retaining property, light shielding property, etc., but in recent years, it has been incinerated in disposal after use. If you do, there is a problem with so-called disposal, such as the problem that the aluminum remains as a residue and damage to the incinerator, so there are physical properties next to aluminum foil, silicon oxide, aluminum oxide, etc. Ceramic vapor deposition films obtained by vacuum deposition of inorganic oxides are increasingly used.

  The various base films are not particularly limited, but single films and various laminated films can be used in consideration of processability and the like.

For example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyolefins such as polypropylene (PP) and polystyrene (PS), polyamides such as nylon-6 and nylon-66 Non-stretched or stretched films such as (PA), polycarbonate (PC), polyacrylonitrile (PAN), and polyimide (PI).

  Usually, these are used after being processed into a film shape, and it is particularly preferable to use a polyethylene terephthalate film (PET) arbitrarily stretched in the biaxial direction from the viewpoints of strength and cost.

  Next, as the deposited layer of the inorganic oxide, it is basically possible to use a metal oxide, for example, aluminum, silicon, magnesium, calcium, potassium, tin, sodium, boron, titanium, lead. , Oxides such as zirconium and yttrium, or a mixture thereof.

  In general, silicon oxide, aluminum oxide, and magnesium oxide are preferably used from the viewpoint of transparency, physical properties, and productivity.

  As a method for forming such an inorganic oxide vapor deposition layer, a vacuum vapor deposition method, a sputtering method, or the like can be used. However, in view of productivity, production cost, etc., the vacuum vapor deposition method is preferable.

  The vacuum deposition method is roughly classified into three types according to the form of the body to be vapor-deposited. 1) Batch method: vapor deposition method of molded product, 2) take-up type semi-continuous method: roll film (web) After unwinding, vapor deposition, and winding in a vacuum system, return to the air system again and take out the vapor deposition product. 3) Unwinder (unwinding device) for roll film (web) ) And a rewinder (winding device) are arranged in the atmospheric system, and a vapor deposition drum and an evaporation source are arranged in a vacuum system to deposit an evaporating substance on a roll film (web). This is a completely continuous method called -air method and has a feature of high productivity.

  When evaporating a vaporized material on a roll film (web), a take-up semi-continuous method is particularly widespread. Describe the structure.

  First, the constituent elements are a roll film (web), an evaporation source, an evaporation substance, a vapor deposition drum, a vacuum system, an unwinder (unwinding device), a rewinder (winding device), a guide roll, and the like.

  Next, the outline of the work process will be described. First, as a preparatory step, the door of the vacuum vapor deposition device is opened, the roll film (web) is set in the unwinder (unwinding device), and it is arranged between the unwinder and the vapor deposition drum. The roll-shaped film (web) travels to the vapor deposition drum through the guide roll that is being wound, and is further wound around the rewinder (winding device) via the guide roll disposed between the rewinder (winding device). And the preparation for vapor deposition of the evaporating substance on the roll film (web) is completed.

  Next, the door of the vacuum vapor deposition apparatus is closed, and the vacuum vapor deposition chamber divided by the vacuum suction constant pressure chamber and the partition wall in the vacuum vapor deposition apparatus is set to a predetermined vacuum environment by a vacuum pump. The roll-like film (web) is fed out and evaporated to the roll-like film (web) traveled through a guide roll by heating and evaporating an evaporation substance from an evaporation source disposed at the lower part of the vapor deposition drum. Vapor deposition (web).

Since the vapor deposition drum is cooled, the evaporated film is recrystallized and fixed to the roll film (web), and the roll film (web) deposited via the guide roll on the rewinder side is attached to the rewinder. It is wound up.

  The internal structure of the vacuum deposition apparatus is divided into a vacuum suction constant pressure chamber and a vacuum deposition chamber by partition walls. The vacuum suction constant pressure chamber is composed of an unwinder, guide roll, tension control device, speed control device, position control device, and vapor deposition drum. Some rewinders are arranged.

In the vacuum deposition chamber, a part of the deposition drum, the evaporation source, its heating device, and the like are arranged, and the vacuum suction constant pressure chamber has a degree of vacuum of 1 by a vacuum pump attached to the periphery of the vacuum deposition apparatus main body. × 10 ⁰ MPa about, the vacuum deposition chamber provided via the partition wall is set to a degree 1 × 10 ^-2 MPa (SI units).

  Since the chamber is divided into two partitions, impurities (dust) such as gas generated from the roll-shaped film (web) in the vacuum suction constant pressure chamber have a bad influence on the deposition in the vacuum deposition chamber. Few.

  On the contrary, the radiant heat from the evaporation source arranged in the vacuum deposition chamber has little influence on the vacuum suction constant pressure chamber, so that the influence on the roll film (web) is small.

  The vacuum deposition method is also a heating method: 1) Indirect resistance method, 2) Direct resistance heating method (wire feed method), 3) High frequency induction heating method, 4) Electron beam method (Electoron Beam, EB method for short) 4 There are two methods, but when the evaporated substance uses an insulating metal oxide such as silicon oxide or aluminum oxide, the electron beam method with high energy conversion efficiency is optimal.

  The winding type electron beam vacuum deposition method is a method in which an evaporating substance such as silicon oxide or aluminum oxide is directly irradiated with an electron beam, and the surface of the evaporating substance is scanned to heat the evaporating substance surface. In this method, energy is converted at a portion where the beam hits to evaporate the evaporated substance.

  Although the thickness of this vapor deposition layer is suitably selected by the end use of a vapor deposition film, it is preferable to exist in the range of 5-400 nm.

  If the film thickness of the vapor deposition layer is less than 5 nm, a uniform film cannot be provided, so that sufficient oxygen gas barrier properties, water vapor barrier properties, aroma retention properties, etc. cannot be obtained, and if the film thickness exceeds 400 nm, flexibility is lost. It is not preferable because the deposited film is liable to crack or peel off due to external factors such as bending and tension.

  Next, the character and the pattern by printing ink are normally provided on the barrier film which consists of a single layer or a multilayer film. In the case of a single-layer barrier film, printing can be performed on either the front surface of the barrier film or the back surface of the barrier film. In general, however, considering the friction resistance, weather resistance, etc. of the ink. It is preferable to provide printing ink on the back surface. Moreover, also in the case of the barrier film of a multilayer film, providing on the back surface of an outermost layer film is common.

  As the printing ink, a colorant composed of a pigment or a dye that gives color to the ink, a resin that adheres to the printed material, and the resin are stably dissolved while the colorant is dispersed and held in fine particles. A vehicle composed of a solvent that retains the dispersibility of the pigments and dyes, the fluidity of the ink, and can transfer the appropriate amount of ink from the printing plate, and further improves the dispersibility of the colorant, develops color, and precipitates. For the purpose of prevention and improvement of fluidity, it is formed from an auxiliary agent such as a surfactant. In particular, the colorant is preferably a pigment having good weather resistance.

As the printing method for providing the printing ink, for example, a known printing method such as a gravure printing method, a silk screen printing method, or a flexographic printing method can be used, but a base is formed by applying copper plating on the surface of an iron cylinder (cylinder). Then, a release layer is provided on the copper-plated surface, further copper-plated, and a concave surface (cell) is created by engraving or corrosion on the copper surface whose surface is mirror-polished. A gravure printing method is preferred, in which printing ink is transferred to enable colorful printing even with a tone, and has a high appealing effect.

  Next, as shown in FIG. 1, a method of laminating a base layer (10) of a barrier film composed of a single layer or a multilayer film and a sealant layer (20) having an easy peel property, and an adhesive used for the lamination, In particular, the dry lamination adhesive will be described in detail below.

  First, as a lamination method, for example, a known method such as a dry lamination method, a non-solvent dry lamination method, a hot melt lamination method, or an extrusion lamination method can be used.

  The dry lamination method includes three sections, a coating unit for applying an adhesive on a film, a drying device, and a nip roller unit, and an unwinding, winding, and tension control system.

  The coating portion generally employs a gravure roll coating method or a reverse roll coating method.

  As the dry lamination adhesive, a solvent type adhesive or a solventless type adhesive is used. However, when a solventless type adhesive is used, a drying device is not necessary, and this is called a non-solvent dry lamination method. It is out.

  The hot melt lamination method is a method in which a hot melt adhesive such as a heat-melted ethylene-vinyl acetate copolymer (EVA) is applied onto a film, and another film is immediately laminated.

  The extrusion lamination method involves heating a thermoplastic resin such as polyethylene or polypropylene, melting it in a cylinder called a cylinder, extruding it by applying pressure with a screw, and forming a narrow slit called a T die at the tip of the cylinder. The thermoplastic resin dissolved in a curtain shape is extruded and laminated into a film shape.

  As described above, the method for laminating the base material layer (10) and the sealant layer (20) includes a dry lamination method, a non-solvent dry lamination method, a hot melt lamination method, a sandwich lamination method using an extrusion lamination method, and the like. However, the dry lamination method is preferable in view of adhesiveness, productivity, cost and the like.

  Next, as the adhesive used in the dry lamination method, polyurethane, polyester, epoxy, polyacrylic, polyvinyl acetate, cellulose, and other laminating adhesives can be used.

As mentioned above, the lid | cover material (A) for a fragrance | flavor container which concerns on this invention has a flange part (3), and is a base material layer (1) which consists of a single layer or a multilayer film at least, and this base material layer (1) A cover material for a fragrance-resistant container (A) covering an opening of a container body (B) made of a laminate provided with a seal layer (2) made of ionomer on the inner surface and hermetically sealed to the flange (3) ) And the lid (
A) comprises at least a laminate of a base layer (10) composed of a single layer or a multilayer film and a sealant layer (20) having easy peel properties, and the sealant layer (20) has a density of 0.910 or more. By using a linear low-density polyethylene resin (L-LDPE), the perfume ingredients such as linemon and menthol do not embrittle the adhesive layer or sealant layer of the composite material used for the lid, and the lid is opened when opened. It is a lid material that does not cause delamination of the material, lowering of the opening strength due to embrittlement of the sealant layer, and occurrence of defective appearance such as a part of the sealant layer remaining in a thread form on the container body.

  In the following, the lid for a fragrance-resistant container (A) of the present invention will be described in more detail with specific examples, but is not limited to these and is applied to a wider range.

<Example 1>
First, as a lid for a fragrance resistant container (A), a base layer (10) has a biaxially stretched polyethylene terephthalate (OPET) film / polyurethane adhesive / aluminum (Al) having a thickness of 15 μm. A barrier film made of a multilayer structure of foil / polyurethane adhesive / biaxially stretched polyethylene terephthalate (OPET) film having a thickness of 12 μm was prepared by a dry lamination method. Next, a linear low density polyethylene resin (L-LDPE) having a thickness of 40 μm and a density of 0.917 is used for the sealant layer (20), and the base material layer (10) and the polyurethane adhesive are used. Using this, lamination was performed by a dry lamination method to obtain a cover material (A) for a fragrance resistant container.

  Next, as an assumed constituent material of the container body (B), the base material layer (1) has a biaxially stretched polyethylene terephthalate (OPET) film / polyurethane-based adhesive / aluminum (Al) with a thickness of 15 μm. A barrier film made of a multilayer structure of foil / polyurethane adhesive / biaxially stretched polyethylene terephthalate (OPET) film having a thickness of 12 μm was prepared by a dry lamination method. Next, for the sealing layer (2) on the inner surface of the base material layer (1), a zinc (Zn) ionomer having a thickness of 40 μm is used, and the base material layer (1) and a polyurethane adhesive are used. Then, lamination was performed by a dry lamination method to obtain a container body (B) assumed constituent material.

  Next, the lid material (A) and the container body (B) assumed constituent material are heat-sealed to prepare a 10 cm × 10 cm pouch, filled with 10 g of a bath agent, and heat-sealed after 40 ° C. × 2 weeks The strength was measured. The measurement results are as shown in Table 1. The sealing strength measurement method is a peeling speed of 300 mm / min and a peeling angle of 90 ° C.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
In Example 1, the lid material (A) was produced in the same manner as in Example 1 except that a polymer alloy easy peel material having a thickness of 40 μm was used as the sealant layer (20) of the lid material (A). The heat seal strength was measured. The measurement results are as shown in Table 1.

<Comparative Example 2>
In Example 1, as the sealant layer (20) of the lid material (A), a linear low density polyethylene resin (L-LDPE) having a density of 0.904 having a thickness of 40 μm was used, and the same as in Example 1. Then, a lid material (A) was produced, and the heat seal strength was measured. The measurement results are as shown in Table 1.

表１は、本発明に係る耐香料容器用蓋材（Ａ）の実施例１と比較例１〜２のヒートシール強度（初期、１ヶ月後）の測定値と評価結果を示した表である。

Table 1 is a table showing measured values and evaluation results of heat seal strength (initial, after one month) of Example 1 and Comparative Examples 1 and 2 of the lid material (A) for the fragrance resistant container according to the present invention. .

<Comparison result>
As shown in Table 1, in comparison with Comparative Examples 1 and 2, Example 1 of the product of the present invention clearly has a high heat seal strength both at the beginning and after one month, and the peeling trace portion is clean. It was. In Comparative Example 1, due to the fragrance component, the sealant became brittle with time and the heat seal strength deteriorated. Moreover, the easy peel material remained in the peeling trace part, and the external appearance was also dirty. In Comparative Example 2, the sealant became brittle, the heat seal strength deteriorated, and the sealant surface began to stick.

It is a fragmentary sectional side view of 1 Example explaining the state of a peeling part, when opening from the state which sealed the cover material for fragrance | flavor containers and the container main body which concern on this invention. It is a fragmentary sectional side view of 1 Example explaining the state of a peeling part, when opening from the state which sealed the conventional lid | cover for fragrance | flavor container and the container main body. It is a fragmentary sectional side view of the other Example explaining the state of a peeling part, when opening from the state which sealed the cover material for conventional fragrance | flavor containers and the container main body.

Explanation of symbols

A: Lid for fragrance resistant container B ... Container body 10 ... Base material layer 20 ... Sealant layer 1 ... Base material layer 2 ... Seal layer 3 ... Flange part 4. ..Peeling part

Claims (3)

  Covering at least the base layer made of a single layer or a multilayer film and the opening of the container body made of a laminate in which a seal layer made of ionomer is provided on the inner surface of the base layer, and having a flange, A lid for a fragrance-resistant container to be hermetically sealed, wherein the lid is composed of a laminate of at least a base layer made of a single layer or a multilayer film and a sealant layer having an easy peel property. A lid for a fragrance resistant container, wherein a polyethylene resin (PE) is used.   The said polyethylene resin (PE) is a linear low density polyethylene resin (L-LDPE) with a density of 0.910 or more, The lid | cover material for perfume-proof containers of Claim 1 characterized by the above-mentioned.   The said base material layer is a barrier film, The lid | cover material for perfume-proof containers of Claim 1 or 2 characterized by the above-mentioned.

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