JP2018076092A - Lid material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid material for PTP which does not use an aluminum foil, in which a seal can be easily broken, and which can retain a high gas barrier property.SOLUTION: A lid material is heat-sealed with a flat surface other than recess parts so as to cover opening surfaces of the recess parts of a container member including the recess parts for storing contents. It is a plastic resin sheet having a lamination structure including, a base material layer, a vapor deposition barrier layer and a sealant layer in this order from a surface side. The lid material has: recess part lid parts corresponding to the recess parts of the container member; and a flat lid part sealed to the flat surface. It has a weakened line stretching from the recess part lid part to the flat lid part. A starting point of the weakened line is formed in the flat lid part. The weakened line formed in the region of the recess part lid part is formed at least in two different directions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lid member. In particular, the present invention relates to a cover material for a press-through pack (PTP) used for a container member having a recess for storing a tablet such as a medicine or a capsule.

  Conventionally, a lid material used as a lid material for PTP is generally configured by laminating a printing layer and a heat-sealable resin layer on an aluminum foil. The lid is broken by pressing and the contents such as tablets stored in the recess are taken out.

At this time, since the lid member containing the aluminum foil is broken and opened, a piece of the aluminum foil is generated, and there is a possibility that the piece is accidentally swallowed together with a tablet or the like.
Moreover, since the lid material contains an aluminum foil, it takes time and effort to separate it at the time of disposal, and from the viewpoint of protecting the global environment, a change to a recyclable material or a combustible material is desired.

  On the other hand, in recent years, orally disintegrating tablets have also become widespread, and higher moisture resistance has been demanded than before. For this reason, it is difficult to easily change the aluminum foil to another material, and it has been difficult to change to a material suitable for protecting the global environment while having high moisture resistance equivalent to that of the aluminum foil.

  Also, for example, when considering changing the material to plastic film, when the lid material is torn, it can be broken if the lid material is a single aluminum foil, but polyethylene terephthalate, which is commonly used as a plastic film When a biaxially stretched resin film such as the above is laminated, there is a problem that it cannot be pushed with fingers as it is.

Therefore, a lid material as disclosed in Patent Document 1 has been proposed as a lid material for PTP that does not use an aluminum foil.
Patent Document 1 discloses a cover material having a structure in which a large number of fine holes are formed on the entire surface of a plastic film and then the fine holes are closed by extrusion coating a molten resin on the plastic film. Moreover, in patent document 1, since the said plastic film has deteriorated with the said fine hole, while being easily torn by press, since the said fine hole is obstruct | occluded with the said molten resin, the said fine hole is It is described that there is no obstacle to the barrier function (gas barrier property).

However, the lid material as disclosed in Patent Document 1 may cause pinholes and cracks in the lid material by performing microfabrication to form a large number of fine holes in the plastic film.
Even if a plastic film with pinholes or cracks caused by such microfabrication is applied, the gas barrier property is not reduced even if the molten resin is coated by extrusion from the plastic film. It is necessary to take measures to improve As a result, there has been a problem in that an aluminum foil is eventually used or the productivity increases due to an increase in the layer structure.

In addition, a PTP cover material that does not use an aluminum foil using a method different from Patent Document 1 has also been proposed (for example, Patent Document 2).
In patent document 2, the slit by laser processing is formed in the position corresponding to the recessed part of a container member of the cover material made from a plastic film. And it is described that the slit is formed in the cover material of the part that receives the pressing, and therefore the contents can be easily taken out by being broken from the slit part at the time of pressing.

However, laser processing using a carbon dioxide gas laser or the like has a problem that due to the processing characteristics, the laser beam is strongly irradiated at the starting point of the drawn line and pinholes are likely to occur in the workpiece (lid material). For this reason, as in Patent Document 2, when laser processing is performed on the lid member in the region corresponding to the concave portion of the container member, the start point of the laser processing drawing line is also included in the region corresponding to the concave portion. Therefore, there is a possibility that a pinhole is generated in the lid member in the region corresponding to the concave portion.
When a pinhole is generated in the lid member in the region corresponding to the concave portion, the contents stored in the concave portion of the container member come into contact with the outside air at the pinhole portion, and the gas barrier property is significantly impaired. There was a problem of becoming.

Japanese Patent Laid-Open No. 7-41043 JP-A-5-161692

  The present invention has been made in view of the above circumstances, and is a PTP lid material that does not use an aluminum foil, which can be easily broken and has high gas barrier properties. It is an object to provide a possible lid.

  The present invention has been made in view of the problems, and the lid material of the present invention is a container member having a recess for storing contents, and a flat surface other than the recess and heat so as to cover the opening surface of the recess. A sealed lid material, which is a plastic resin sheet having a laminated structure including a base material layer, a vapor deposition barrier layer, and a sealant layer in order from the surface side, and a concave lid portion corresponding to the concave portion of the container member; A flat lid portion that is sealed to a flat surface, and has a weakening line extending between the concave lid portion and the flat lid portion, and a starting point of the weakening line is formed in the flat lid portion. The weakening line formed in the region of the concave cover part is formed in at least two different directions.

  Moreover, the said weak line formed in the area | region of the said recessed part lid part of the cover material of this invention may be formed in two directions which comprise at least substantially right angle.

Moreover, the said weak line of the cover material of this invention may be formed only in the range from the surface of a cover material to the said base material layer.
At this time, the formation depth of the weakening line in the base material layer may be not less than 5% and not more than 80% of the thickness of the base material layer.

  Further, the lid material of the present invention presses the content that fits in the region of the recess lid portion in a substantially vertical direction from the sealant layer side of the recess lid portion, and the content breaks and penetrates the recess lid portion. The maximum breaking strength may be 100 N or less.

  In the lid material of the present invention, a barrier resin layer may be laminated between the vapor deposition barrier layer and the sealant layer.

By having the vapor deposition barrier layer, the lid material of the present invention can be a lid material having sufficient gas barrier properties without using an aluminum foil.
In addition, by forming the starting point of the weak line formed to facilitate the tearing of the lid material on the flat lid portion sealed to the flat surface of the container member, a pinhole or the like occurred at the starting point. Even in this case, it is possible not to affect the gas barrier property of the recessed portion lid. Accordingly, it is possible to provide a lid member that has the convenience of being easily ruptured and that has high gas barrier properties.
In addition, by forming the weakening line formed in the region of the concave lid portion in at least two different directions, it can be more easily broken and the convenience of the user can be improved. Become.

  Further, in the lid material of the present invention, the weakening line formed in the region of the concave lid portion is formed in at least two directions that are substantially perpendicular to each other, so that the concave lid is interposed via the contents in the container member. As a result of the pressing force applied to the part spreading in a substantially right angle direction, it is possible to break the lid material in a region sufficient for taking out the contents.

  Further, the deposition barrier layer and the sealant layer laminated under the base material layer by forming the weakening line of the lid material of the present invention only in the range from the surface of the cover material to the base material layer. Are not affected by the formation of the weakening lines. By adopting such a configuration, even if the weakening line is formed, there is no possibility that the gas barrier properties (oxygen permeability and water vapor permeability) of the vapor deposition barrier layer are lowered.

  Moreover, when the depth of formation of the weakening line in the base material layer at this time is 5% to 80% of the thickness of the base material layer, when pressed from the sealant layer side. It is possible to provide the weakening line deep enough to make it possible to break the lid. Moreover, there is no possibility that the weakening line formation may be affected by making the weakening line formation depth too deep.

  Further, the lid material of the present invention presses the content that fits in the region of the recess lid portion in a substantially vertical direction from the sealant layer side of the recess lid portion, and the content breaks and penetrates the recess lid portion. By setting the breaking strength when the maximum strength at that time is the breaking strength to 100 N or less, the lid can be easily broken by the user's fingers.

  In addition, the lid material of the present invention can further enhance the gas barrier property of the lid material by laminating a barrier resin layer between the vapor deposition barrier layer and the sealant layer, and the ordinary PTP The present invention can be applied to contents that require higher moisture resistance as compared to the contents stored in the container.

It is explanatory drawing which showed typically sectional drawing of embodiment of the PTP container using the cover material of this invention. It is explanatory drawing which showed typically sectional drawing of embodiment of the cover material of this invention. It is explanatory drawing which showed typically the example of the drawing line shape of the weak line formed in a cover material. (A)-(c) shows embodiment of this invention, (d)-(f) has shown the form of the comparative example.

  Embodiments for carrying out the present invention will be described below with reference to the drawings.

The lid material 2 of the present invention is a lid material 2 of a PTP container 1 as shown in FIG. 1, and is a concave portion so as to cover the opening surface of the concave portion 41 of the container member 4 having the concave portion 41 for storing the contents 5. It is distributed and used in a state where it is heat-sealed with a flat surface 42 other than 41. The lid member 2 is a recess 41 of the container member 4.
Is divided into two regions, a concave lid portion 21 corresponding to the above and a flat lid portion 22 sealed by the flat surface 42, and has a weakening line 3 extending over the concave lid portion 21 and the flat lid portion 22. .

  The lid member 2 is a plastic resin sheet having a laminated structure as shown in FIG. 2, and includes at least a base material layer 202, a vapor deposition barrier layer 203, and a sealant layer 206 in order from the surface side.

In general, a description of contents such as the name of the contents 5 is printed on the surface of the lid 2 of the PTP container 1, and in this case, the first pattern is formed on the outer layer side of the base material layer 202 as shown in FIG. A configuration in which the printing layer 201 is laminated is conceivable.
Therefore, considering that the base material layer 202 has a function as a printing base material of the first picture printing layer 201, a polyester film such as polyethylene terephthalate, a polyolefin film such as polypropylene, and the like are preferably used.

The vapor deposition barrier layer 203 is a layer formed by vapor-depositing an inorganic oxide on a vapor deposition base material. Examples of the vapor deposition substrate used here include polyester films such as polyethylene terephthalate and polyethylene naphthalate, polyolefin films such as polyethylene and polypropylene, polystyrene films, polyamide films, polyvinyl chloride films, polycarbonate films, polyacrylonitrile films, A polyimide film or the like is used, which may be stretched or unstretched, and preferably has mechanical strength and dimensional stability. These are processed into a film and used. In particular, polyethylene terephthalate (PET) arbitrarily stretched in the biaxial direction is preferably used. In addition, various known additives and stabilizers such as antistatic agents, ultraviolet inhibitors, plasticizers, lubricants, and the like may be used on the surface of the base material to improve adhesion to the thin film. Therefore, corona treatment, low temperature plasma treatment, ion bombardment treatment may be performed as pretreatment, and chemical treatment, solvent treatment, etc. may be performed.
The inorganic oxide used for the vapor deposition barrier layer 203 is preferably an inorganic oxide such as aluminum oxide, silicon oxide, magnesium oxide, or a mixture thereof, and the inorganic oxide is vapor-deposited on the vapor deposition substrate. To form a deposited thin film layer.
If necessary, a transparent primer layer can be laminated on the vapor deposition substrate, and a gas barrier coating layer can be laminated on the vapor deposition thin film layer made of an inorganic oxide.

  Here, the optimum condition of the thickness of the vapor-deposited thin film layer varies depending on the type and configuration of the inorganic compound used, but generally it is preferably in the range of 5 to 300 nm, and the value is appropriately selected. However, if the film thickness is less than 5 nm, a uniform film may not be obtained or the film thickness may not be sufficient, and the function as a gas barrier material may not be sufficiently achieved. On the other hand, when the film thickness exceeds 300 nm, flexibility cannot be maintained in the thin film, and the thin film may be cracked due to external factors such as bending and pulling after the film formation. The thickness of the deposited thin film layer is more preferably in the range of 10 to 150 nm.

  Further, as shown in FIG. 2, a second pattern printing layer 204 is optionally formed between the vapor deposition barrier layer 203 and the sealant layer 206. Thus, when providing the 2nd pattern printing layer 204 in the inner layer side of the vapor deposition barrier layer 203, it is calculated | required that the vapor deposition barrier layer 203 is transparent.

Further, for the purpose of further improving the gas barrier property of the lid member 2, a barrier resin layer 205 may be laminated between the vapor deposition barrier layer 203 and the sealant layer 206.
The barrier resin layer 205 is used to supplement or reinforce the gas barrier property held by the vapor deposition barrier layer 203. For example, an adhesive layer having a gas barrier property is preferably used.
As such an adhesive layer having a gas barrier property, an adhesive layer having a structure in which the gas barrier property is enhanced by elongating a gas permeation path by, for example, blending a filler in a resin that does not allow gas such as oxygen and water vapor to permeate. For example, an inorganic filler-containing barrier polyurethane resin is preferably used.

  The sealant layer 206 may be any material as long as sufficient adhesion with the flat surface 42 of the container member 4 can be obtained. Specifically, the low-density polyethylene resin, linear low-density polyethylene resin, Polyethylene resin such as high density polyethylene resin, unstretched polypropylene resin, or ethylene copolymer film such as ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, or heat seal A hot melt adhesive made of varnish, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, or the like is preferably used.

The weakening line 3 formed at a position extending over the concave lid portion 21 and the flat lid portion 22 of the lid member 2 is formed to facilitate the breaking of the lid member 2.
The weakening line 3 can be formed by a known method such as half-cut processing using a metal blade or laser processing using a laser such as a carbon dioxide gas laser. However, considering that high processing accuracy such as fine setting of the formation depth is required, it is preferable to perform half-cut processing with a drawn line by laser processing.
Here, in the drawing by laser processing, there is a problem that the laser is irradiated more intensely at the starting point of the drawing than at other portions, and a pinhole is easily generated in the workpiece. Therefore, in order to prevent the gas barrier property from being lowered due to the pinhole, the starting point of the weakening line 3 is formed in the flat lid portion 22 in the present invention.

The shape of the drawn line of the weakening line 3 is not particularly limited, but at least the starting point of the weakening line 3 is formed in the flat lid portion 22 and the weakening line 3 formed in the region of the concave lid portion 21 is at least 2 It is required to be formed in two different directions. The starting point position is determined for the reason described above.
The shape in the area | region of the recessed part lid part 21 is formed in at least two different directions for the following reasons. For example, when the weakening line 3 is formed only in one direction as shown in FIG. 3D, when the lid member 2 is pressed in the substantially vertical direction from the sealant layer 206 side of the concave lid portion 21 through the contents 5. The force for breaking the lid member 2 is transmitted in one direction in which the weakening line 3 is formed (the vertical direction in the example of FIG. 3D), but the force for breaking is not transmitted in the other directions. It is difficult to break the lid 2 to such an extent that the object 5 can be taken out. For this reason, the weakening line 3 is formed in at least two different directions in the region of the recess lid 21.
In FIG. 3, in order to clarify the relationship between the region position of the concave portion lid portion 21 of the lid member 2 and the weakening line 3, the region of the concave portion lid portion 21 is a short broken line, and the weakening line 3 is a long dashed line. Each is illustrated.

Here, as shown in FIG. 3 (e), even if the number of the weakening lines 3 formed only in one direction is increased, the weakening lines 3 in the region of the concave lid portion 21 are formed as in the lid member 2 of the present invention. The effect as when formed in at least two different directions cannot be obtained.
Even if the number of the weakening lines 3 is increased as shown in FIG. 3 (e), if the formation direction is substantially the same direction, it is substantially from the sealant layer 206 side of the recess lid portion 21 via the contents 5. The force that breaks the lid 2 when the lid 2 is pressed in the vertical direction is due to the fact that the weakening line 3 is formed in only one direction. As a result, parallel cuts are formed by the number of the weakening lines 3, and it is still difficult to take out the contents 5.

Therefore, in the lid member 2 of the present invention, as shown in FIGS. 3A, 3B, and 3C, the weakening lines 3 in the region of the recess lid portion 21 are formed in at least two different directions. In the embodiment of the weak line 3 shown in FIGS. 3A, 3B, and 3C, not only the start point of the weak line 3 but also the end point is formed on the flat lid portion 22. At the point, there is no problem of causing a pinhole in the workpiece by irradiating the laser intensely unlike the starting point. Therefore, only the starting point is formed in the flat lid part 22 and the starting point is the concave lid part 21. The shape formed inside may be sufficient.

Moreover, it is preferable that the weakening line 3 in the area | region of the recessed part lid part 21 is formed in two directions which comprise at least substantially right angle. This is because, when the two directions form an acute angle, the effect of the present invention, that is, the ease of breaking by forming the weakening line 3 in the two directions, becomes smaller as the acute angle becomes smaller. This is because, even in the case of two directions, the weakening line 3 formed in the two directions becomes closer to a straight line as the obtuse angle increases, and it is considered that the effect of ease of tearing becomes difficult.
The weakening line 3 in the region of the recess lid portion 21 is formed in at least two substantially perpendicular directions so that the pressing force applied to the recess lid portion 21 via the contents 5 in the container member 4 is substantially reduced. As a result of spreading in the perpendicular direction, it is possible to easily break the lid member 2 in a region sufficient to take out the contents 5.

Moreover, it is preferable that the formation depth of the weakening line 3 is in a range from the surface of the lid member 2 (first picture print layer 201 in FIG. 2) to the base material layer 202. This is because when the weakening line 3 is formed up to the vapor deposition barrier layer 203 formed on the inner surface side of the base material layer 202, a crack or the like is generated in the vapor deposition barrier layer 203 from the portion where the weakening line 3 is formed. This is because the gas barrier property of 2 may be lowered.
In particular, the weakening line 3 is preferably formed to a depth in the range of 5% to 80% of the thickness of the base material layer 202. This is because, when the formation depth of the weakening line 3 is only less than 5% of the base material layer 202, a relatively large force is required when the lid material 2 is broken by pressing from the sealant layer 206 side. This is because there is a possibility of becoming. Further, when the formation depth of the weakening line 3 is set to be deeper than 80% of the base material layer 202, the deposition barrier layer 203 and the weakening line 3 are close to each other, and the weakening line 3 is formed in the deposition barrier layer 203. The gas barrier properties may be reduced.

  The lid member 2 formed with the weakening line 3 presses the content 5 that fits in the region of the recess lid portion 21 in the substantially vertical direction from the sealant layer 206 side of the recess lid portion 21, and the content 5 presses the recess lid portion 21. When the maximum strength at the time of breaking through is defined as the breaking strength, the breaking strength is preferably 100 N or less. The breaking strength of 100N or less is a force that can be easily broken by the user's fingers and is considered to be used by people with weak fingers such as children and the elderly. More preferably, the breaking strength is 50 N or less.

The material of the container member 4 sealed and sealed with the lid member 2 is not particularly limited as long as it has an oxygen barrier property and a water vapor barrier property in order to maintain the gas barrier property of the entire PTP container 1. However, when taking into account the storage of tablets or capsules such as pharmaceuticals as the contents 5, it is preferable that the contents 5 can be identified from the outside of the recess 41 of the container member 4 from the viewpoint of preventing accidental ingestion and confirming the quantity. It is preferable to use a material that can identify the transparent or translucent contents 5 at least in the concave portion 41.
Further, at least the surface of the flat surface 42 is required to be a material having good adhesion to the sealant layer 206 of the lid member 2, and for example, polyethylene, polypropylene, or the like is preferably used.

A user who takes out the contents 5 of the PTP container 1 to which the lid member 2 of the present invention is applied grips the PTP container 1 so that the concave portion 41 of the container member 4 is upward and the lid member 2 is downward. The concave portion 41 in which the object 5 is stored is pressed downward. Then, the contents 5 are pressed against the sealant layer 206 side of the lid member 2 through the recess 41. When the content 5 is pressed against the lid 2, the concave lid 21 of the lid 2 is torn from the portion where the weakening line 3 is formed, whereby the lid 2 is broken and the content 5 is taken out. Is possible.

  Specific examples of the present invention will be described below.

<Example 1>
After the base material layer 202 having the first picture print layer 201 on one surface, the vapor deposition barrier layer 203, and the sealant layer 206 are bonded together, the base material layer is used from the picture print layer 201 side using a carbon dioxide gas laser. The lid member 2 was created by drawing a weakening line 3 having a depth up to the layer 202. At this time, the base material layer 202 is made of polyethylene terephthalate (PET) having a thickness of 12 μm, the vapor deposition barrier layer 203 is formed by using biaxially stretched PET as the vapor deposition base material, and depositing 20 nm of silicon oxide as an inorganic oxide. did. A heat seal varnish was used for the sealant layer 206.
Further, the weakening line 3 is drawn in a cross shape as shown in FIG. At this time, the vertical line and the horizontal line constituting the cross are both drawn at the flat lid portion 22 and the intersection of the cross is located in the concave lid portion 21 so that the concave lid portion 21 has a substantially right angle. A weak line 3 in two directions was formed.
The formation depth of the weakening line 3 was set to be in the range of 5% to 80% of the thickness of the base material layer 202.
The obtained lid member 2 was sealed with the flat surface 42 of the container member 4 containing the contents 5 in the recess 41 to obtain the PTP container 1. The contents 5 were pharmaceutical tablets.

  The obtained PTP container 1 was evaluated for breakability, takeout property, and moisture resistance. The results of these evaluations are shown in Table 1.

The sealability is measured by measuring the maximum strength (seal strength) when the concave portion 41 in which the contents 5 are stored is flat pressed and compressed while the lid material 2 is downward, and the contents 5 penetrate the lid material 2. And evaluated by the magnitude of the breaking strength.
In Table 1, as for the sealability, ◯ indicates that the seal strength is 100 N or less, and ◎ indicates that the seal strength is 50 N or less.

The take-out property was confirmed by pressing the concave portion 41 in which the contents 5 were stored with the thumb in a state where the lid member 2 was placed downward, and confirming the state of taking out the contents 5.
In Table 1, the take-out property was evaluated as “◯” when the contents 5 could be taken out without resistance, and “X” when the contents 5 could not be taken out.

Moisture resistance was measured using the water vapor permeability test method (calcium chloride pocket method) of blister packaging of solid preparations. Specifically, two container members 4 having ten recesses 41 are prepared, and each recess 41 of one container member 4 is uniformly filled with a hygroscopic agent, and the lid member 2 is sealed. A PTP container 1a for a moisture-proof test was obtained. Here, calcium chloride which was allowed to cool in a desiccator (phosphorous oxide (V)) after drying at 110 ° C. for 1 hour was used as the hygroscopic agent. Each concave portion 41 of the other container member 4 was filled with glass beads having a mass similar to that of the hygroscopic agent, and the lid member 2 was sealed to obtain a control PTP container 1b.
5-10 PTP containers 1a for moisture-proof test and PTP container 1b for control are prepared and stored for one week in a storage environment of 40 ° C./75% RH, and then the mass of the PTP container 1a for moisture-proof test And the mass of the PTP container 1b for control was measured, and the average value (mass increase) of the mass difference was calculated to obtain the moisture absorption amount.

  In Table 1, the moisture resistance is ◎ when the moisture absorption is less than 1 mg, ◯ when the moisture absorption is 1 mg or more and less than 2 mg, and × when the moisture absorption is 2 mg or more.

<Example 2>
A lid 2 and a PTP container 1 were obtained in the same manner as in Example 1 except that the shape of the weakening line 3 was changed to a grid pattern as shown in FIG. At this time, both the vertical line and the horizontal line constituting the grid are drawn at the flat lid 22 at the starting point of the drawn line, and the intersection is located in the concave lid 21, so that 2 A direction weakening line 3 was formed.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 3>
A lid 2 and a PTP container 1 were obtained in the same manner as in Example 1 except that the shape of the weakening line 3 was changed to a U-shaped cross as shown in FIG. At this time, the starting point of the U-shape is the flat lid portion 22, and both the vertical U-shape and the lateral U-shape are positioned so as to form a substantially cross as a whole in the concave lid portion 21. In the portion 21, weak lines 3 in two substantially perpendicular directions are formed.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Comparative Example 1>
A lid and a PTP container were obtained in the same manner as in Example 1 except that the shape of the weakening line 3 was changed to one in the vertical direction as shown in FIG.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative example 2>
A lid and a PTP container were obtained in the same manner as in Example 1 except that the shape of the weakening line 3 was changed to that of three parallel lines in the vertical direction as shown in FIG.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 3>
A lid material and a PTP container were obtained in the same manner as in Example 1 except that the shape of the weakening line 3 was changed to a U-shape surrounding the outer periphery of the concave lid portion 21 as shown in FIG.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 4>
A lid and a PTP container were obtained in the same manner as in Example 1 except that the weakening line 3 was not formed.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparison result 1>
The evaluation results of Examples 1 to 3 and Comparative Examples 1 to 4 due to the difference in the shape of the weakening line 3 are compared using Table 1.
In Table 1, the formation depth of the weakening line 3 is expressed as “laser processing strength”, and the case where the depth is set to less than 5% of the thickness of the base material layer 202 is “weak”. When the thickness is set to be in the range of 5% to 80% of the thickness, “medium” is displayed, and when the thickness is set to be 80% or more of the thickness of the base material layer 202, “strong” is displayed. Yes.

First, when comparing the sealability, both the comparative example 4 in which the weakening line 3 is not formed and the comparative example 3 in which the weakening line 3 is formed only in the flat lid part 22 are x, When a lid material that does not form the weakening line 3 is used in the region of the concave lid portion 21, a force greater than 100N is required to break the lid material, and it is difficult for the user to easily break the lid. It turns out that it is a cover material. The breaking strength of Examples 1 to 3 in which the weakening line 3 was formed in the region of the concave lid portion 21 was 50 N or less, and the breaking strength of Comparative Examples 1 and 2 was 100 N or less.
In the first to third embodiments, since the weakening line 3 in two directions is formed in the region of the concave lid portion 21, it can be broken even with a relatively weak force of 50N or less. In Comparative Examples 1 and 2, although the weakening line 3 is formed in the region of the concave lid portion 21 in only one direction, 100N that can be sealed by a general adult. I think that it was able to break with the following power. Further, in Comparative Examples 3 and 4, since the weakening line 3 is not formed in the region of the concave lid portion 21 to which a flat pressing force is applied via the contents 5, the material can be broken even with a force of 100N. I think it was not possible.

Next, take-out properties will be compared. In Examples 1 to 3 in which the weakening lines 3 in the region of the recess lid portion 21 were formed in two substantially perpendicular directions, the contents 5 could be taken out without resistance. On the other hand, in Comparative Examples 1 and 2 in which the weakening line 3 is formed only in one direction, the lid 5 was broken along the weakening line 3, but the contents 5 could not be taken out.
Moreover, the comparative example 3 and 4 whose tearability evaluation was x was also unable to take out the content 5. This is because, in Comparative Examples 1 and 2, the weakening line 3 is formed only in one direction, so the force to break the lid 2 is transmitted in one direction (vertical direction) in which the weakening line 3 is formed. It is considered that the lid member 2 could not be broken to such an extent that the contents 5 could be taken out because the breaking force was not transmitted in the other directions.

Next, the moisture resistance is compared. In Examples 1 and 2 in which the weakening lines 3 are formed in a cross shape (FIG. 3 (a)) and a grid pattern (FIG. 3 (b)), the moisture absorption amount is 1 mg or more and less than 2 mg. The moisture absorption amount of Example 3 with the weak line 3 of c)) was less than 1 mg, and the moisture absorption amounts of Comparative Examples 1 to 4 were less than 1 mg.
This is because, in Examples 1 and 2, the intersection of the longitudinal and lateral weakening lines 3 is present in the region of the recess lid portion 21, whereas in Example 3 and Comparative Examples 1 to 4, the recess lid It is considered that a difference in the amount of moisture absorption between the two due to the absence of the intersection of the weakening lines 3 in the region of the portion 21. However, also in Examples 1 and 2, the moisture absorption amount is less than 2 mg, and it has a sufficient moisture-proof ability as the lid material 2 of the PTP container 1 having the contents 5 as pharmaceutical tablets.

<Example 4>
After the base material layer 202 having the first pattern printing layer 201 on one surface, the vapor deposition barrier layer 203, the barrier resin layer 205, and the sealant layer 206 are bonded together, the pattern is formed using a carbon dioxide gas laser. The lid member 2 was created by drawing a weakening line 3 having a depth from the printed layer 201 side to the base material layer 202. At this time, the base material layer 202 is made of polyethylene terephthalate (PET) having a thickness of 12 μm, the vapor deposition barrier layer 203 is formed by using biaxially stretched PET as the vapor deposition base material, and depositing 20 nm of silicon oxide as an inorganic oxide. did. Further, a gas barrier adhesive PASLIM manufactured by DIC was used for the barrier resin layer 205, and a heat seal varnish was used for the sealant layer 206.
Further, the weakening line 3 is drawn in a cross shape as shown in FIG. At this time, the vertical line and the horizontal line constituting the cross are both drawn at the flat lid portion 22 and the intersection of the cross is located in the concave lid portion 21 so that the concave lid portion 21 has a substantially right angle. A weak line 3 in two directions was formed.
Moreover, the formation depth of the weakening line 3 was set to reach 80% or more of the thickness of the base material layer 202.
The obtained lid member 2 is sealed with the flat surface 42 of the container member 4 containing the contents 5 in the recess 41, and P
A TP container 1 was obtained. The contents 5 were pharmaceutical tablets.

  The obtained PTP container 1 was evaluated for breakability, takeout property, and moisture resistance. The results of these evaluations are shown in Table 1.

<Example 5>
The lid 2 and the PTP container 1 were obtained in the same manner as in Example 4 except that the formation depth of the weakening line 3 was set to be in the range of 5% to 80% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 6>
The lid 2 and the PTP container 1 were obtained in the same manner as in Example 4 except that the formation depth of the weakening line 3 was set to be less than 5% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 7>
A lid 2 and a PTP container 1 were obtained in the same manner as in Example 4 except that the shape of the weakening line 3 was changed to a grid pattern as shown in FIG. At this time, both the vertical line and the horizontal line constituting the grid are drawn at the flat lid 22 at the starting point of the drawn line, and the intersection is located in the concave lid 21, so that 2 A direction weakening line 3 was formed.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 8>
The lid 2 and the PTP container 1 were obtained in the same manner as in Example 7 except that the formation depth of the weakening line 3 was set to be in the range of 5% to 80% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 9>
The lid 2 and the PTP container 1 were obtained in the same manner as in Example 7 except that the formation depth of the weakening line 3 was set to be less than 5% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 10>
A lid 2 and a PTP container 1 were obtained in the same manner as in Example 4 except that the shape of the weakening line 3 was changed to a U-shaped cross as shown in FIG. At this time, the starting point of the U-shape is the flat lid portion 22, and both the vertical U-shape and the lateral U-shape are positioned so as to form a substantially cross as a whole in the concave lid portion 21. In the portion 21, weak lines 3 in two substantially perpendicular directions are formed.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 11>
The lid 2 and the PTP container 1 were obtained in the same manner as in Example 10 except that the formation depth of the weakening line 3 was set to be in the range of 5% to 80% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Example 12>
The lid 2 and the PTP container 1 were obtained in the same manner as in Example 10 except that the formation depth of the weakening line 3 was set to be less than 5% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealing property, the take-out property, and the moisture resistance of the obtained PTP container 1.

<Comparative Example 5>
A lid and a PTP container were obtained in the same manner as in Example 4 except that the shape of the weakening line 3 was changed to a single straight line in the vertical direction as shown in FIG.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 6>
A lid and a PTP container were obtained in the same manner as in Comparative Example 5 except that the formation depth of the weakening line 3 was set to be in the range of 5% to 80% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 7>
A lid and a PTP container were obtained in the same manner as in Comparative Example 5 except that the formation depth of the weakening line 3 was set to be less than 5% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 8>
A lid and a PTP container were obtained in the same manner as in Example 4 except that the shape of the weakening line 3 was changed to that of three parallel lines in the vertical direction as shown in FIG.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 9>
A lid and a PTP container were obtained in the same manner as in Comparative Example 8 except that the formation depth of the weakening line 3 was set to be in the range of 5% to 80% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 10>
A lid and a PTP container were obtained in the same manner as in Comparative Example 8 except that the formation depth of the weakening line 3 was set to be less than 5% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 11>
A lid material and a PTP container were obtained in the same manner as in Example 4 except that the shape of the weakening line 3 was changed to a U-shape surrounding the outer periphery of the concave lid portion 21 as shown in FIG.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 12>
A lid and a PTP container were obtained in the same manner as in Comparative Example 11 except that the formation depth of the weakening line 3 was set to be in the range of 5% to 80% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative Example 13>
A lid and a PTP container were obtained in the same manner as in Comparative Example 11 except that the formation depth of the weakening line 3 was set to be less than 5% of the thickness of the base material layer 202.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparative example 14>
A lid and a PTP container were obtained in the same manner as in Example 4 except that the weakening line 3 was not formed.
Table 1 shows the results of evaluating the sealability, takeout property, and moisture resistance of the obtained PTP container.

<Comparison result 2>
The evaluation results of Examples 4 to 12 and Comparative Examples 5 to 14 due to the difference in the shape of the weakening line 3 and the difference in the formation depth (laser processing strength) of the weakening line 3 are compared using Table 1.
In Table 1, the formation depth of the weakening line 3 is expressed as “laser processing strength”, and the case where the depth is set to less than 5% of the thickness of the base material layer 202 is “weak”. When the thickness is set to be in the range of 5% to 80% of the thickness, “medium” is displayed, and when the thickness is set to be 80% or more of the thickness of the base material layer 202, “strong” is displayed. Yes.

First, when comparing the breaking property, both the comparative example 14 in which the weakening line 3 is not formed and the comparative examples 11 to 13 in which the weakening line 3 is formed only in the flat lid portion 22 are x. Therefore, when a lid material that does not form the weakening line 3 is used in the region of the concave lid portion 21, a force greater than 100N is required to break the lid material, and the user can easily break the lid. It turns out that it is a difficult lid.
Further, even when the weakening line 3 is formed in the region of the concave lid portion 21, the comparative example in which the weakening line 3 is formed only in one direction and the laser processing strength is “weak”. In 7 and 10, the sealability evaluation is x. Looking at the comparative example with the same shape of the 3 weak lines, it can be seen that even if the laser processing strength is “strong”, the evaluation of the breaking property is ○, and the breaking requires a force larger than 50 N (Comparative Example 5). 8).
On the other hand, in Examples 4-12 which have the weakening line 3 of the two directions in the area | region of the recessed part lid part 21, even if a laser processing intensity | strength is "weak", a sealability evaluation is (circle). When the laser processing strength was “medium” or higher, the evaluation of breaking property was “◎”. Thereby, when it has the weakening line 3 of 2 directions in the area | region of the recessed part lid part 21, it turns out that the outstanding tearability is show | played.

Next, take-out properties will be compared. In Examples 4 to 12 in which the weakening lines 3 in the region of the recess lid portion 21 were formed in two substantially perpendicular directions, the contents 5 could be taken out without resistance. On the other hand, in Comparative Examples 5 to 10 in which the weak line 3 is formed only in one direction, the contents 5 can be taken out even if the lid material is broken along the weak line 3. I could not do it.
Moreover, the comparative examples 11-14 whose breakage evaluation was x were also unable to take out the content 5.
This is because, in Comparative Examples 1 and 2, the weakening line 3 is formed only in one direction, so the force to break the lid 2 is transmitted in one direction (vertical direction) in which the weakening line 3 is formed. It is considered that the lid member 2 could not be broken to such an extent that the contents 5 could be taken out because the breaking force was not transmitted in the other directions.

Next, the moisture resistance is compared. In Examples 4 to 9 in which the weakening lines 3 are formed in a cross shape (FIG. 3A) and a grid pattern (FIG. 3B), the moisture absorption amount is obtained when the laser processing strength is “strong” (Example 4). 7) was 1 mg or more and less than 2 mg, and the laser processing strength was “medium” or less, it was less than 1 mg. Moreover, the moisture absorption amount of Examples 10-12 which made the weak line 3 of the cross shape (FIG.3 (c)) by U character was less than 1 mg irrespective of the laser processing intensity | strength. Moreover, the moisture absorption amount of Comparative Examples 5-14 was less than 1 mg.
This is because in Examples 4 and 7, the formation line of the weakening line 3 is large, and the intersection of the longitudinal and lateral weakening lines 3 exists in the region of the recess lid portion 21, so the weakening line 3 It is considered that the moisture-proof property was slightly inferior to that of other examples having the same conditions other than the formation depth. However, in Examples 4 and 7, the moisture absorption amount is less than 2 mg, and it has a sufficient moisture-proof ability as the lid 2 of the PTP container 1 having the contents 5 as pharmaceutical tablets.
Moreover, in Examples 10-12 and Comparative Examples 5-14, since the intersection of the weakening line 3 does not exist in the area | region of the recessed part lid part 21, it thinks that it has the outstanding moisture-proof property.

  From these results, according to the present invention, the starting point of the weakening line 3 is formed in the flat lid portion 22 and the weakening line 3 in the region of the concave lid portion 21 is formed in at least two different directions. It is possible to provide a lid material for PTP that does not use an aluminum foil, which can be easily broken and can maintain a high gas barrier property.

DESCRIPTION OF SYMBOLS 1 ... PTP container 2 ... Lid material 21 ... Concave lid part 22 ... Flat lid part 201 ... 1st pattern printing layer 202 ... Base material layer 203 ... Deposition barrier layer 204 ... 2nd pattern printing layer 205 ... Barrier resin layer 206 ... Sealant layer 3 ... Weak line 4 ... Container member 41 ... Recess 42 ... Flat surface 5 ... ·Contents

Claims (6)

A lid member heat-sealed with a flat surface other than the concave portion so as to cover the opening surface of the concave portion of the container member having the concave portion for storing the contents,
In order from the surface side, it is a plastic resin sheet of a laminated structure including a base material layer, a vapor deposition barrier layer, and a sealant layer,
A concave lid portion corresponding to the concave portion of the container member, and a flat lid portion sealed to the flat surface,
Having a weakening line across the recess lid and the flat lid,
The starting point of the weakening line is formed on the flat lid part,
The lid material formed in the region of the recess lid portion is formed in at least two different directions. The lid according to claim 1,
The said weakening line | wire formed in the area | region of the said recessed part lid part is formed in 2 directions which comprise at least substantially right angle, The lid | cover material characterized by the above-mentioned. The lid according to claim 1 or 2,
The said weak line is formed only in the range from the surface of a cover material to the said base material layer, The cover material characterized by the above-mentioned. The lid material according to claim 3,
The depth of formation of the weakening line in the base material layer is 5% or more and 80% or less of the thickness of the base material layer. The lid material according to any one of claims 1 to 4,
The content that fits in the region of the recess lid portion is pressed in a substantially vertical direction from the sealant layer side of the recess lid portion, and the maximum strength when the content breaks and penetrates the recess lid portion is defined as the breaking strength. if you did this,
The lid material having a breaking strength of 100 N or less. It is a lid material given in any 1 paragraph of Claims 1-5,
A lid material comprising a barrier resin layer laminated between the vapor deposition barrier layer and the sealant layer.