JP5257425B2 - Lid material - Google Patents

Description

  The present invention relates to a container lid such as a fragrance, a moisture absorbent, etc., and in particular when used, the base film can be peeled from the container and the sealant layer side can be left as a container lid. The lid material.

  Conventionally, fragrances used for the purpose of deodorization indoors such as toilets, store contents such as dehumidifiers and fragrances in a plastic molded container with a flange whose innermost layer is made of polyethylene resin, and its opening Cover the part with a breathable lid made of heat-sealable nonwoven fabric, perforated film, or paper treated with heat-seal varnish, so that the contents do not spill and moisture or fragrance components are breathable. It can be passed through the lid. Further, in order to seal the breathability of the breathable lid material until use, this breathable lid material is further added to polyethylene terephthalate (PET) / polyethylene (PE) / aluminum foil (Al) / PE, silicon oxide on PET film , Or a vapor-deposited film (VMPET) / heat seal varnish, a stretched nylon (ONy) / polyvinylidene chloride (PVDC) / ONy / PE having a layer structure formed with a transparent vapor-deposited thin film layer of aluminum oxide Things like covering with materials are being done.

  However, in this method, two types of lid materials, a breathable lid material and a barrier lid material, are hermetically sealed to the container using a sealing method such as heat sealing, and the sealing must be performed in two steps. There are problems such as the high cost of the lid material due to the use of two types of lid materials, which are expensive, and the contents spilling through the inner lid when the contents are liquid if they are overturned.

  The inventors have developed a lid material that can be separated into a ventilation layer and a barrier layer that can be sealed with a one-step seal and that does not spill contents even if it falls, as a method for solving such problems. (For example, refer to Patent Document 1).

  However, in this invention, since a fragrance is easily collected between the ventilation layer and the barrier layer, a new problem has arisen that a peeling phenomenon is likely to occur between the ventilation layer and the barrier layer.

JP 2002-120858 A

  The present invention is an improvement of JP-A No. 2002-120858 made by paying attention to the above-mentioned problems related to the lid material of a flanged fragrance container whose innermost layer is made of PE resin, and is sealed with a one-step seal. It is an object of the present invention to provide a lid material that does not spill out even if it falls, and that can be separated into a ventilation layer and a barrier layer having resistance to content.

The invention of claim 1 of the present invention covers the opening of a plastic molded container with a flange, and a lid member hermetically sealed with a flange portion provided at the periphery of the molded container.
From the outside, it consists of a composite film in which a base film, a barrier layer, a buffer layer, an adhesive layer, and a sealant layer are sequentially laminated. The adhesive layer between the buffer layer and the sealant layer is formed of a polyethylene resin by a melt extrusion method. ,
The buffer layer is a film substrate containing at least one of unstretched polypropylene resin, biaxially stretched polypropylene resin, and polyethylene terephthalate resin,
The sealant layer is made of a polyethylene resin-based unstretched film,
Using a constant speed extension type tensile tester, 300 mm / min. The peel strength when the lid material is peeled between the adhesive layer and the buffer layer under the condition of 90 ° at a speed of 0.2 N / 15 mm to 0.4 N / 15 mm,
When using a fragrance, the base material film, the barrier layer, and the buffer layer are peeled off to leave the adhesive layer and the sealant layer in the container.

  Thus, according to the first aspect of the present invention, the layer structure of the lid material is composed of a composite film in which the base film, the barrier layer, the buffer layer, the adhesive layer, and the sealant layer are sequentially laminated, and the buffer layer and the sealant. Since the adhesive layer between the layers is formed of a polyethylene resin by a melt extrusion method, a perfume attack part consisting of a base film, barrier layer and buffer layer in front of the barrier layer, an adhesive layer, and a release layer consisting of a sealant layer By separating, the content resistance of the lid can be improved.

  The invention according to claim 2 is the film substrate according to the invention according to claim 1, wherein the buffer layer is made of any one of a single-layer or multilayer unstretched polypropylene resin, biaxially-stretched polypropylene resin, and polyethylene terephthalate resin. It is the lid | cover material characterized by this.

  Thus, according to the invention described in claim 2, since the buffer layer is a film substrate made of either a single layer or a multilayer unstretched polypropylene resin, biaxially stretched polypropylene resin, or polyethylene terephthalate resin, The resin layer is hard and has a high melting point, and when sealed with a container, it is possible to avoid polyethylene escape, polyethylene pulling, polyethylene accumulation and the like.

  The invention of claim 3 is the lid material according to claim 1 or 2, wherein the sealant layer is made of a polyethylene resin-based unstretched film.

  Thus, since the sealant layer is made of a polyethylene resin-based unstretched film, the innermost layer has good sealing and sealing properties with the polyethylene resin-based plastic molding resin.

  According to a fourth aspect of the present invention, in the first, second, or third aspect of the invention, the lid member and the molded container are hermetically sealed with a linear seal bar.

  Thus, according to the fourth aspect of the present invention, since the lid member and the molded container are hermetically sealed by the linear seal bar, the lid member and the molded container can be easily peeled off.

  As described above, the lid material of the present invention can improve the content resistance of the lid material by providing a buffer layer between the barrier layer and the sealant layer.

  Further, by placing a stiff and high melting point resin layer such as polypropylene resin or polyethylene terephthalate resin as the buffer layer, it is possible to avoid accumulation of polyethylene, polyethylene pulling, polyethylene escape, and the like.

It is sectional explanatory drawing which shows one Example of the cover material of this invention. It is sectional explanatory drawing which shows one Example of the state which is going to open after the cover material of this invention is covered on a plastic molding container, and is sealed and sealed.

  The lid | cover material of this invention is demonstrated in detail below based on one Embodiment.

  For example, as shown in FIGS. 1 and 2, the lid material of the present invention has a base film (11), a barrier layer (12), a buffer layer (13), an adhesive layer (14), and a sealant layer (15). It has a structure consisting of composite films (10) laminated in sequence.

  The base film (11) is not particularly defined, but a PET film, a biaxially stretched polypropylene (OPP) film, an ONy film and the like can be preferably used.

  Further, the base film may be a single layer or a multilayer structure in which the above-described plastic film, paper, or the like is combined in an appropriate combination.

  Furthermore, you may provide a printing layer (not shown) in a base film (11) as needed.

  For the barrier layer (12), a plastic film or metal foil excellent in gas barrier properties such as Al and VMPET films can be preferably used.

  For the buffer layer (13), a single-layer or multi-layer unstretched polypropylene (CPP) film, OPP film, PET film and the like can be preferably used.

  By providing the buffer layer (13), the fragrance is concentrated and peeled in front of the barrier layer (12) as compared with the configuration in which the barrier layer (12) and an adhesive layer (14) described later are laminated adjacently. This can be avoided, and delamination can be avoided by separating the boundary portion and the peeling portion between the barrier layer and the adhesive layer where the perfume is most likely to accumulate, and the low barrier layer of the sealant layer.

  The adhesive layer (14) between the buffer layer (13) and a sealant layer (15) to be described later is preferably formed of a polyethylene resin by a melt extrusion method, and if necessary, the adhesive layer (14) of the buffer layer. ) Can be subjected to ozone treatment and corona discharge treatment.

  The adhesive layer (14) is formed of a polyethylene resin by a melt extrusion method, and compared with an adhesive method using an adhesive such as a dry laminating method. Deterioration of the layer can be avoided, and stability of adhesive strength and peel strength when storing the fragrance can be obtained.

  Since the sealant layer (15) is hermetically sealed with the flange (21) of the plastic molded container (20), it is preferable to use a resin of the same system as the outermost layer of the molded container, and a polyethylene resin-based unstretched film is preferable. Can be used.

  Methods for laminating the base film (11) and the barrier layer (12) or the barrier layer (12) and the buffer layer (13) are generally known, such as a dry laminating method, a non-sol laminating method, and an extrusion laminating method. Use the laminating method. At that time, an adhesive is used as an adhesive layer (not shown) in the dry laminating method and the nonsol laminating method, and a molten extruded resin is used in the extrusion laminating method.

  The lid material (10) obtained by cutting the composite film (10) thus produced into an appropriate size is a plastic molding containing contents such as a gel-like fragrance as shown in FIG. It is placed in the opening of the container (20) and hermetically sealed by a flange (21) provided on the periphery of the container and a linear seal bar.

  Plastic molded container (20) is, for example, [container outside] PP / ethylene-vinyl acetate copolymer resin (EVA) / PP / PE [container inside], [container outside] unstretched polyethylene terephthalate resin (APET) / linear Low density polyethylene resin (LLDPE) [container inside], [container outside] A composite sheet produced by a dry laminate method composed of APET / ethylene vinyl alcohol copolymer resin (EVOH) / LLDPE [container inside], etc. was formed into a sheet. A molded tray can be preferably used.

  In any case, the innermost surface of the plastic molded container needs to be made of the same material as the sealant layer of the lid.

  The hermetic seal is performed by fusing the sealant layer of the lid material and the innermost surface of the plastic molding container. The hermetic seal method is generally known such as a heat seal method, an impulse seal method, an ultrasonic seal method, etc. A sealing method may be used.

  In addition, it is convenient at the time of use if a tab is provided in advance on the lid.

  Hereinafter, the present invention will be described in detail by way of examples.

<Example 1>
RXC-18 (manufactured by Tosero Corporation), which is a PET film having a thickness of 12 μm as the base film (11), Al having a thickness of 7 μm as the barrier layer (12), and a CPP film having a thickness of 70 μm as the buffer layer (13). ) Were prepared as LLDPE films having a thickness of 70 μm as sealant layers (15), respectively.

  Next, a PET film having a thickness of 12 μm, which is a base film (11), and an Al film having a thickness of 7 μm, which is a barrier layer (12), are bonded together by a dry laminating method to form a PET (12 μm) / Al (7 μm) structure. A composite first film was obtained.

  The Al surface of the composite first film and the 70 μm thick CPP film as the buffer layer (13) are bonded together by a dry laminating method to form a composite second film having a PET (12 μm) / Al (7 μm) / CPP (70 μm) configuration. A film was obtained.

  Finally, an LLDPE film having a thickness of 70 μm as a sealant layer (15) is bonded to the CPP surface of this composite second film through PE (25 μm) as an adhesive layer (14) by an extrusion laminating method. A lid material of Example 1 having a configuration of (12 μm) / Al (7 μm) / CPP (70 μm) / LDPE (25 μm) / LLDPE (70 μm) was produced.

<Example 2>
PET (12 μm) using the same material and method as in Example 1 except that a composite third film obtained by extruding PP (20 μm) onto a CPP film having a thickness of 50 μm as a buffer layer (13) and sticking together by the minate method was used. A lid material of Example 2 having a structure of / Al (7 μm) / CPP (50 μm) / PP (20 μm) / LDPE (25 μm) / LLDPE (70 μm) was produced.

<Example 3>
PET (12 μm) / Al (7 μm) / OPP (25 μm) / LDPE (25 μm) / LLDPE using the same materials and methods as in Example 1 except that an OPP film having a thickness of 25 μm was used as the buffer layer (13). A lid material of Example 3 having a (70 μm) configuration was produced.

<Example 4>
PET (12 μm) / Al (7 μm) / PET (38 μm) / LDPE (25 μm) / LLDPE using the same material and method as in Example 1 except that a 38 μm thick PET film was used as the buffer layer (13). A lid material of Example 4 having a (70 μm) configuration was produced.

<Comparative Example 1>
A composite film having a layer structure in which the buffer layer (13) was removed from the layer structure of Example 1 was produced and used as a lid material of Comparative Example 1.

  That is, it is a cover material composed of PET (12 μm) / Al (7 μm) / LDPE (25 μm) / LLDPE (70 μm).

<Comparative example 2>
A composite film having the same layer structure as Comparative Example 1 was prepared except that a composite layer made of ethylene-methacrylic acid copolymer resin (EMAA) (25 μm) / LDPE (25 μm) was used as the adhesive layer. A lid was used.

  That is, it is a cover material having a PET (12 μm) / Al (7 μm) / EMAA (25 μm) / LDPE (25 μm) / LLDPE (70 μm) structure.

Four types of examples prepared in this way, two types of comparative examples, a total of six types of lid materials, a suitable amount of gel fragrance (30) was added, A; APET (300 μm) / LLDPE (30 μm), B; APET (300 μm) / EVOH (30 μm) Covered on the opening of a flanged plastic molding container made of a composite sheet of two types of material composition, a heat sealer used a line seal bar with a seal width of 1 mm, temperature: 150 ° C. , Pressure: 2 × 10 ⁵ Pa, time: 1.0 sec.

  And the state of the peeling surface at the time of peeling a cover material from A and B type 2 containers, peeling strength, and the preservation | save state were observed and measured by the method of mentioning below. The results are shown in Table 1.

State of release surface: Visual observation of traces of release, polyethylene pool, etc. Peel strength: 300 mm / min. Using a constant speed extension type tensile tester. Measure the peel strength when the cover material is peeled off between the adhesive layer and the buffer layer (in the comparative example, the barrier layer and the adhesive layer) under two conditions of 90 ° and 180 °, in units of N / 15 mm.
Storage evaluation: Sealed and sealed, left in a constant temperature layer at 60 ° C, and visually observed the state of the lid material after 6, 12, 18, and 24 hours.

表１から分かるように、緩衝層を設けることにより、蓋材の耐内容物性が向上する。また、シーラント層とバリア層とは比較的弱い力で分離することができる。

As can be seen from Table 1, by providing the buffer layer, the content resistance of the lid material is improved. Further, the sealant layer and the barrier layer can be separated with a relatively weak force.

DESCRIPTION OF SYMBOLS 10 ... Composite film, cover material 11 ... Base film 12 ... Barrier layer 13 ... Buffer layer 14 ... Adhesive layer 15 ... Sealant layer 20 ... Plastic molding container 21 ... Flange 30 ... Contents

Claims (1)

Covering the opening of a plastic molded container with a flange, and a lid material hermetically sealed with a flange portion provided at the periphery of the molded container,
From the outside, it consists of a composite film in which a base film, a barrier layer, a buffer layer, an adhesive layer, and a sealant layer are sequentially laminated. The adhesive layer between the buffer layer and the sealant layer is formed of a polyethylene resin by a melt extrusion method. ,
The buffer layer is a film substrate containing at least one of unstretched polypropylene resin, biaxially stretched polypropylene resin, and polyethylene terephthalate resin,
The sealant layer is made of a polyethylene resin-based unstretched film,
Using a constant speed extension type tensile tester, 300 mm / min. The peel strength when the lid material is peeled between the adhesive layer and the buffer layer under the condition of 90 ° at a speed of 0.2 N / 15 mm to 0.4 N / 15 mm,
When using a fragrance | flavor, it is possible to peel a base film, a barrier layer, and a buffer layer, and to leave an adhesive layer and a sealant layer in a container.

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