JP2012051632A - Separable transparent lid member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent lid member employing a composite film formed of an upper layer with barrier properties and a permeable lower layer, which seals the opening of a molded container with a flange containing a volatile or evaporating liquid or a solid, has only the upper layer peeled off when in use and has the lower layer kept sealed with the flange of the container with permeability maintained, and a container using the lid member.SOLUTION: The lid member covers the opening of the molded container with the flange, is hermetically sealed with a flange portion along the molded container, and has a pull-tab formed along the circumference. The separable transparent lid member is made of the composite film including the upper layer with barrier properties made of a transparent barrier film and a sealant in the order named from the outer side, and the permeable lower layer formed by melt extrusion and made of polyethylene and a sealant, wherein the layers are sequentially laminated.

Description

  The present invention is a transparent lid material using a composite film composed of an upper layer having barrier properties and a lower layer having air permeability, sealing the opening of a container containing a liquid or solid that evaporates or evaporates, and the upper layer during use. The lid is made of a lid material and a container using the same, which are sealed with a flange of the container and prevent liquid and solid in the container from coming out.

  Conventionally, containers for deodorants, fragrances, dehumidifiers, insect repellents, fragrances, etc., contain the contents in flanged paper cups or plastic molded containers, and the openings are heat-sealable nonwoven fabrics, perforated films, Alternatively, by covering with a breathable lid made of heat-treated varnished paper or the like, the contents do not drop when the container falls, and the solvent or fragrance component of the contents covers the breathable lid. It can be passed.

  Further, in order to seal the breathability of the breathable lid material until use, this breathable lid material is further laminated with a polyethylene terephthalate (PET) film / aluminum foil / easy peel sealant, and PET film with silicon oxide or aluminum Barrier property consisting of laminated structure of vapor-deposited film (VMPET) / heat sealable varnish provided with transparent oxide thin film layer of oxide, stretched polyethylene terephthalate (OPET) film / stretched nylon (ONy) film, polyethylene (PE), etc. Such as covering with the outer lid of.

  However, in such a conventional method, each of the two types of lid materials, the breathable lid material and the barrier lid material, is hermetically sealed to the container using a sealing method such as heat sealing, and the sealing is performed in two steps. There is a problem that not only the processing cost is high but the cost of the lid material is high due to the use of two types of lid materials.

Many researches and developments have been made by paying attention to the above problems concerning the lid material of the flanged container whose innermost layer is made of PE resin (for example, see Patent Document 1).
According to the invention proposed in Patent Document 1, a lid that can be sealed with a one-step seal and that can be separated into an air-permeable layer and a barrier layer that does not spill contents even if it falls over. It is said that can be provided. However, there are restrictions on the configuration of the container as the adherend, and in particular, when the solvent component of the contents is a component such as water that is difficult to scatter at room temperature, the amount of solvent / fragrance scattering is also limited.

  Further, in Patent Document 2, in order to solve this problem, in a laminated structure composed of a barrier layer / separation layer / sealant layer, a half-cut process penetrating the sealant layer is performed, so that the container after peeling the barrier layer is used as a permeable membrane. The remaining sealant layer can be provided with holes for adjusting the content solvent scattering amount. Moreover, in order to prevent the content leaching from the half cut hole, an easy peel sealant layer is used as the separation layer, and the easy peel sealant layer is agglomerated and peeled at the time of peeling.

  However, in the above invention, the material structure of the easy peel sealant layer is not particularly specified, and when the melting point of the base polymer constituting the easy peel sealant layer is low with respect to the sealant, the easy peel layer is not sealed at the seal to the container. Problems such as collapse and failure to exhibit good peeling may occur. Also, the half-cut line of the sealant layer is used as a trigger for peeling, but re-bonding of the half-cut part may occur during container sealing, so it may be difficult to use this peeling trigger method with this configuration. all right.

In Patent Document 3, the opening of a plastic molded container with a flange is covered, and the lid can be sealed with a flange portion and a one-step seal on the periphery of the molded container. A lid material that can be easily peeled off from a plastic container by being peeled off from a pull tab and separated into a base material and a permeable layer has been proposed.
This lid material is a lid material composed of a composite film in which a base material, a separation layer, and a transmission layer are sequentially laminated from the outside, and the separation layer is composed of a polymer alloy single layer, and is a separable lid material It is.

  Further, in Patent Document 4, in a lid formed by laminating an inner layer and an outer layer, the outer layer and the inner layer can be easily and stably maintained without requiring a complicated process such as controlling the adhesive strength with an adhesive. As a cover material that can be laminated in a peelable manner, the outer layer is composed of a base material layer and a polyethylene-based resin layer, and the inner layer is composed of a base material layer composed of a stretched polypropylene film and a sealing layer composed of a thermoadhesive resin, and the outer layer There has been proposed a cover material in which a polyethylene resin layer and an inner base material layer are laminated so as to be capable of interfacial peeling.

  In this lid material, since the outer layer and the inner layer are directly laminated, it is not necessary to use a separate adhesive, and it can be easily and stably peeled. In addition, even if the lid made by punching the lid material is heat-sealed to the flange of the container at a high temperature, the adhesive strength is not used at the interface between the outer layer and the inner layer. It can be easily peeled off.

  However, in the separable lid material proposed in Patent Document 3, the pull tab base portion serving as a separation boundary is a separation trigger, and a half-cut line penetrating only the transmission layer is interposed between the seal outer periphery and the flange outer periphery. This process must be provided and is troublesome.

  As well as a problem common to the lid material proposed in Patent Document 4, it is difficult to confirm the sealing state when heat-sealing the flange of the container. It has been pointed out that it is easy to overlook defects such as when sealing in a mixed state (interference seal).

JP 2002-128127 A. Japanese Patent Application Laid-Open No. 2003-237811. JP 2006-131233 A. Japanese Patent Application Laid-Open No. 2008-44657.

  An object of the present invention is a lid member using a composite film comprising an upper layer having barrier properties and a lower layer having air permeability, and seals the opening of a flanged molded container containing a liquid or solid that evaporates or evaporates. In addition, only the upper layer was peeled off during use, and the lower layer was sealed with a flange of the container while maintaining the air permeability, and the transparent lid material for preventing the liquid and solid in the container from coming out was used. Is to provide a container.

According to the first aspect of the present invention, there is provided a transparent barrier film from the outside in a cover material which covers an opening of a molded container with a flange and is hermetically sealed with a flange portion at the peripheral edge of the molded container and has a pull tab formed on the outer peripheral edge. It is a separable transparent lid made of a composite film in which an upper layer having a barrier property made of a sealant, a polyethylene formed by a melt extrusion method, and a lower layer having a breathability made of a sealant are sequentially laminated.

  According to the first aspect of the present invention, from the outside, the cover material has an upper layer having a barrier property made of a transparent barrier film and a sealant, and a lower layer having a breathability made of polyethylene and a sealant formed by a melt extrusion method. By comprising the composite film laminated | stacked one by one, it is possible to isolate | separate an upper layer and a lower layer easily at the time of use.

  By using a transparent barrier film as the upper layer, it is possible to construct a lid that allows the contents to be seen while having almost the same barrier properties as when aluminum foil is used to ensure barrier properties. It became easier to detect abnormalities in the state of heat-sealing, and it became easier to remove defective products.

By providing a sealant layer on the lower side of the upper layer and a polyethylene layer formed by melt extrusion on the upper side of the lower layer, the lower layer is cut in the thickness direction by the seal edge during heat sealing to the flange of the container. Owing to this, a part of the upper layer and the lower layer of the composite film outside the flange can be peeled off, and the upper layer and the lower layer can be peeled at the interface by lifting the edge.
As a result, it is no longer necessary to provide a separate incision process for starting peeling when peeling at the interface between the upper layer and the lower layer.

The invention according to claim 2 is the separable transparent lid material according to claim 1, wherein the upper layer sealant is an unstretched polypropylene resin.
According to the invention described in claim 2, since the upper sealant is an unstretched polypropylene resin, it is less susceptible to heat than the polyethylene resin, and the upper sealant layer is crushed in the heat seal portion to the molded product flange. Problems such as inadequate peeling can be avoided.

  Further, in the invention of claim 3, the lower layer has a multilayer structure, a polyethylene resin layer formed by a melt extrusion method is disposed on the upper layer side, and a resin layer similar to the container is provided on the adherend side which is the container side. It is arrange | positioned, It is the separable transparent lid | cover material of any one of Claim 1 or 2.

  According to the invention described in claim 3, the lower layer has a multilayer structure, a polyethylene resin layer formed by a melt extrusion method is disposed on the upper layer side, and a resin layer similar to the container is formed on the adherend side which is the container side. Since the lid is hermetically sealed with the flange of the adherend, which is a container, when the lid is peeled off, the lower layer is firmly welded to the adherend, so only the upper layer is separated and removed. I can do it.

The invention according to claim 4 is the separable transparent lid according to claim 3, characterized in that an intermediate layer is disposed inside the polyethylene resin layer formed by the melt extrusion method of the lower layer. It is.
According to invention of Claim 4, since an intermediate | middle layer can be arrange | positioned inside the PE resin layer formed by the melt extrusion method of the said lower layer, For example, in the separable transparent lid | cover material excellent in gas barrier property can do.

The invention according to claim 5 is characterized in that an easily peelable coating layer is provided on the upper layer side of the lower layer of the pull tab base, and is separable according to any one of claims 1 to 4. Transparent cover material.
According to the invention described in claim 5, since the easy-peeling coating layer is provided on the upper layer side of the lower layer of the pull tab base, it is possible to selectively reduce the peel strength of only that portion when peeling from the pull tab. it can.

The invention according to claim 6 is the separable transparent lid material according to any one of claims 1 to 5, wherein a vent hole is formed in the lower layer.
As described above, according to the sixth aspect of the present invention, since the vent hole is formed in the lower layer, the content solvent scattering amount can be adjusted.

Moreover, invention of Claim 7 is a separable transparent cover material of any one of Claims 1-6 by which the printing layer is provided in the surface or the back surface of the said composite film. is there.
As described above, according to the invention described in claim 7, in the separable transparent lid material of the present invention, the surface or the back surface of the composite film is decorated or explanation of contents as long as it does not overlap with the necessary transparency range. Since a printing layer can be provided, information about the contents and a design for appeal can be displayed.

The invention of claim 8 is a flanged plastic molded container or paper container using the separable transparent lid member according to any one of claims 1 to 7.
Thus, according to the eighth aspect of the present invention, the plastic molded container with a flange using a separable transparent lid material that not only makes it easy to confirm the contents but also does not cause abnormal heat sealing to the flange, or It can be a paper container.

As described above, the separable transparent lid material of the present invention can reduce the cost as compared with the conventional double lid configuration. That is, since a single lid can be used, the production cost can be reduced and the filling line can be simplified.
Moreover, since it is transparent, not only can the contents be easily confirmed, but also an abnormality in heat sealing to the container flange can be easily found. Therefore, it is possible to reliably remove foreign matters and contents mixed in the seal portion as interstitial materials or defective seal portions.

  In addition, by changing the size of the slit hole provided in the lower layer, the opening area of the lower layer after the upper layer peeling can be adjusted, so it is more effective to adjust the volatilization amount of the medicinal ingredients from the contents and the amount of solvent scatter during use Can be used.

In addition, by using an upper layer sealant based on a polypropylene resin and an extruded polyethylene on the upper surface of the lower layer, the lower layer is cut at the seal edge portion during heat sealing.
As a result, the end of the composite film on the outside of the flange can be peeled off without making a mechanical cut such as a half cut in the lower layer, and the upper layer and the lower layer are peeled at the interface by lifting the end. It can be made.

  Since this seal is applied to the upper surface of the flange in a ring shape surrounding the opening of the container, at the start of use of the container in which the contents are enclosed, only the lower surface with air permeability is left in the opening and the medicinal components, etc. It is easy to make it possible to release.

An example of the separable transparent lid | cover material of this invention. (A) is a cross section of the layer structure, (b) is a cross section at the time of sealing, and (c) is a cross section at the time of peeling. An example of the container using the separable transparent lid | cover material of this invention. (A) is a cross section of the layer structure of the lid member, (b) is a plan view when sealed from the top, and (c) is a cross section when sealed.

Embodiments of the separable transparent lid material of the present invention will be described below with reference to the drawings as necessary.
For example, as shown in FIG. 1, the separable transparent lid material of the present invention covers the opening of a flanged molded container (7), and in the flange part (6) and the heat seal part (5) at the periphery of the molded container. It is a cover material that is hermetically sealed and has a pull tab formed on the outer periphery, and is composed of a composite film (1) in which an upper layer (2) and a lower layer (3) are sequentially laminated from the outside.
The upper layer (2) of the composite film (1) includes a transparent barrier film (2a) and an upper sealant (2b) from the outside, and the lower layer (3) is a polyethylene layer (3a) formed by a melt extrusion method from the outside. And a layer containing a lower sealant (3b).

  The transparent barrier film (2a) is a base material for the cover material, and typically a transparent stretched polyethylene terephthalate film single layer is used. However, when gas barrier properties similar to those of aluminum foil are required, it is oxidized on one side. Transparent film layer having a high barrier property such as an inorganic compound-deposited polyethylene terephthalate film (GL film) in which a thin film of an inorganic compound such as aluminum or silicon oxide is provided to a thickness of about 20 to 100 nm by a vapor deposition method such as physical vapor deposition or chemical vapor deposition These can be used alone or in layers.

  The thickness of the transparent barrier film (2a) is not particularly limited as long as it has the necessary physical properties as a base material for the lid. However, the stretched polyethylene terephthalate film has a single layer and a barrier property of about 12 μm from the viewpoint of ease of handling and cost. Laminated films are often used.

Moreover, a printing layer (refer FIG. 3) can also be formed in a back surface or the surface in a transparent barrier film. In this case, the printing area needs to be provided at a position where it does not hinder the visual recognition of the contents or the abnormality detection of the heat seal portion.
By providing the printed layer, it is possible to give a beautiful pattern or design to the lid and to decorate it.

The upper sealant (2b) is a layer that adheres the transparent barrier film (2a) and the polyethylene layer (3a) formed by the melt extrusion method to such an extent that it can be easily and easily peeled off. Used.
The resin used for the upper sealant must have a higher melting point than the polyethylene layer formed by melt extrusion of the lower layer to be heat-sealed with this, and a copolymer or the like containing a polypropylene resin as a main component may also be used. I can do it. The upper layer sealant (2b) may be an easy peel sealant layer having a multilayer structure.
The upper sealant (2b) can be laminated with the transparent barrier film (2a) by a known method such as a melt extrusion method or a dry lamination method, and the thickness is not particularly limited, but about 70 μm is appropriate.

  The lower layer (3) consists of a layer comprising a polyethylene layer (3a) and a lower layer sealant (3b) formed by melt extrusion. The polyethylene layer (3a) needs to have a lower melting point than the resin used for the upper sealant (2b) in order to melt and break at the seal edge during sealing, and the polyethylene resin used for the melt extrusion method is optimal. The thickness of the polyethylene layer (3a) is preferably in the range of 5 μm to 30 μm.

Since the lower layer sealant (3b) needs to be heat-sealed with the flange (6) of the molded container (7), it is desirable to use a resin layer similar to the upper surface of the flange part of the container to be the adherend.
By doing this, after sealing the lid material with the flange of the adherend that is the container and then removing the lid material, the lower layer is firmly welded to the adherend, so only the upper layer is separated and removed I can do it. When the surface of the molded container (7) is a polyethylene resin, a polyethylene resin such as linear low density polyethylene (LLDPE) can be preferably used.

  The lower layer sealant (3b) can be prepared by a known method, and the thickness is preferably in the range of 20 μm to 130 μm.

In the lower layer (3), a small-diameter air hole can be formed for adjusting the amount of scattering of the contents stored in the molded container (7). This vent has a bonding strength such that a small-diameter hole is removed from the lower layer when the cover material is separated into an upper layer and a lower layer by half-cutting through only the lower layer.
As a drilling method, there are half cut with a Thomson blade, porous machining, hot needle machining, and the like.

  It is good also as a structure by which the intermediate | middle layer (9) is arrange | positioned as needed inside the polyethylene resin (3a) formed of the lower layer (3) by the melt extrusion method. As the intermediate layer (9) for reinforcing the mechanical strength, a stretched film such as a stretched polyethylene terephthalate film or a stretched nylon film can be used. The material and dimensions of the intermediate layer (9) can be appropriately selected depending on the purpose.

  Also, the intermediate layer can be formed by a known method such as a printing method or a partly method, but this intermediate layer (9) does not affect the melt fracture of the lower layer (3) at the seal edge (4). It is necessary to arrange only in the area | region inside a seal | sticker part (5). (See Figure 4)

  By providing an easily peelable coating layer (11) mainly composed of polyamide, nitrified cotton, etc. on the upper layer side of the lower layer (3) of the pull tab portion (8) base, the lid material (1) is removed from the flange (6). When peeling, the peel strength can be partially reduced, and the peel interface can be further easily opened (see FIG. 5).

Hereinafter, the present invention will be described in detail by way of examples.
In this example, a composite film composed of an upper layer and a lower layer was produced. In all the composite films, a transparent vapor-deposited PET film (GX-PF) having a thickness of 12 μm was used as the upper transparent barrier film (2a), and the transparent barrier film (2a) and the upper sealant (2b) were A laminated container of polyethylene terephthalate film and polyethylene film was used as a molded container (7) which was bonded by dry lamination with a polyurethane resin adhesive and was an adherend.

<Example 1>
A transparent vapor-deposited PET film (GX-PF) having a thickness of 12 μm is used as an upper transparent barrier film (2a), an unstretched polypropylene film for retort having a thickness of 70 μm is used as an upper sealant (2b), and both are made of polyurethane resin. The laminated film of the upper layer (2) was prepared by laminating by dry lamination using an adhesive.

  Separately, a linear low density polyethylene film having a thickness of 100 μm was used as the lower layer sealant (3b), and the upper layer sealant surface of the laminated film of the upper layer (2) was formed into a 15 μm thick extrusion grade polyethylene resin by a melt extrusion method. The composite film (1) was prepared by laminating (3a) and bonding.

  The layer structure of the composite film thus prepared is as follows: transparent vapor-deposited PET film 12 μm (2a) / unstretched polypropylene film for retort 70 μm (2b) / polyethylene resin 15 μm (3a) by melt extrusion / linear low The density polyethylene film is in the order of 100 μm (3b). (See FIG. 2).

<Example 2>
An easy peel sealant layer in which an unstretched polypropylene resin layer having a thickness of 12 μm and a resin layer having a composition of polypropylene / polyethylene / ethylene-propylene rubber = 70/25/5 having a thickness of 6 μm were laminated was prepared as an upper sealant layer (2b). .
Then, the transparent vapor-deposited PET film (GX-PF) having a thickness of 12 μm is used as the upper transparent barrier film (2a), and the unstretched polypropylene resin layer side of the easy peel sealant layer is opposed to the upper layer (2 ) Was prepared.
Separately, a laminated film (3) in which a polyethylene terephthalate film having a thickness of 12 μm as an intermediate layer (9) and a linear low-density polyethylene film having a thickness of 100 μm as a sealant layer (3b) are bonded together by a part lamination method; The upper layer (2) laminated film prepared above is opposed to the upper layer sealant (2b) surface, and an extrusion grade polyethylene resin is laminated (3a) to a thickness of 15 μm by a melt extrusion method and bonded to form a composite. Film (1) was prepared.

  The layer structure of the composite film thus prepared is as follows: transparent vapor-deposited PET film 12 μm (2a) / upper layer sealant film 18 μm (2b) / polyethylene resin 15 μm (3a) by melt extrusion method / linear low density polyethylene film The order is 100 μm (3b). (See FIG. 2).

  The composite film of Example 1 to Example 2 produced in this manner was punched out with a half-cut line through which the lower layer (3b) penetrates a pull tab base for peeling trigger and a small diameter vent hole. Then, the gel container is filled with an appropriate amount of gel-like aromatic deodorant (PH; 2), and the lower layer side of each lid is heat sealed to the upper surface of the container flange. The effect of sex was evaluated visually.

In the container using the transparent lid material of Example 1 to Example 2, the pull tab portion of the transparent lid material is lifted upward, and layers other than the lower layer can be peeled with an appropriate peeling strength, and the plastic molded container opening The lower layer with a vent hole remained.
Further, in the container of the example, since the adhesion state of the flange seal portion can be visually confirmed through the transparent lid member, seal defects such as a foreign matter and a mixed seal of contents are obvious at a glance.

DESCRIPTION OF SYMBOLS 1 ... Composite film 2 ... Upper layer 2a ... Transparent barrier film 2b ... Upper layer sealant 3 ... Lower layer 3a ... Polyethylene resin layer 3b formed by melt extrusion method ... Lower layer sealant 4 ... Seal edge 5 ... Heat seal part 6 ... Flange 7 ... Molded container 8 ... pull tab portion 9 ... intermediate layer 10 ... printing layer 11 ... easily peelable coating layer 12 ... flange cut 13 ... air vent

Claims (8)

  An upper layer covering the opening of the flanged molded container and hermetically sealed with the flange portion at the periphery of the molded container and having a pull tab on the outer periphery, and having a barrier property comprising a transparent barrier film and a sealant from the outside A separable transparent lid made of a composite film in which polyethylene formed by melt extrusion and an air-permeable lower layer made of a sealant are sequentially laminated.   The separable transparent lid according to claim 1, wherein the upper layer sealant is an unstretched polypropylene resin.   The lower layer has a multilayer structure, a polyethylene resin layer formed by a melt extrusion method is disposed on the upper layer side, and a resin layer similar to the container is disposed on the adherend side which is the container side. The separable transparent lid | cover material of any one of Claim 1 or 2.   The separable transparent lid according to claim 3, wherein an intermediate layer is disposed inside a polyethylene resin layer formed by a melt extrusion method of the lower layer.   The separable transparent lid | cover material of any one of Claims 1-4 by which the easily peelable coating layer is provided in the upper layer side of the lower layer of the said pull tab base.   The separable transparent lid member according to any one of claims 1 to 5, wherein a vent hole is formed in the lower layer.   The separable transparent lid | cover material of any one of Claims 1-6 by which the printing layer is provided in the surface or the back surface of the said composite film.   A plastic molded container or paper container with a flange using the separable transparent lid member according to any one of claims 1 to 7.

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