JPH07256842A - Cover material with press-through function - Google Patents

Abstract

PURPOSE:To smoothly take out a content by means of press-through by deteriorating a polypropylene resin film by irradiating it with a radiation in a cover formed of the film and a reinforcing resin layer laminated on the film as base materials. CONSTITUTION:A cover material 3 having a press-through function comprises a uniaxially or biaxially oriented polypropylene resin film having a thickness of 10-40mum and a reinforcing resin layer laminated on the film and having a thickness of 6-60mum as base materials. The layer laminated in the film is not deteriorated by irradiating it with a radiation and has tearing properties together with the film after it is irradiated with the radiation. The film is deteriorated to a strength of the degree for performing the press-through function by irradiating it with the radiation before or after the material 3 is adhered to a bottom material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to medical devices such as needle packs, toiletry products such as toothbrushes, button batteries,
The present invention relates to a lid material having a press-through function, which is used for a packaging body such as a blister pack for packaging stationery and the like.

[0002]

2. Description of the Related Art As a package for injection needle packs, toothbrushes, etc., a bottom material made of a molded plastic sheet having a recess for storing contents, and a recess opening for storing contents in the bottom material. A so-called blister pack composed of a paper lid member that closes up the sheet is used.

In a blister pack having an injection needle pack as a content, after the injection needle pack is placed in a recess for storing contents in the bottom material, the opening of the recess is closed by a lid member made of sterilized paper, and further sterilized. Γ for the whole blister pack for
It is obtained by irradiating radiation such as rays with a dose of about 10 to 50 kGy. To take out the contents from the blister pack that contains this needle pack, either tear off the paper lid material from the bottom material or push up the contents from the outside of the bottom material with your fingertips to break through the lid material. It is performed by a method such as so-called press-through.

In a blister pack containing a toothbrush as a content, the toothbrush is placed in a recess for storing the content in the bottom material, and then the opening of the recess is closed by a paper lid member having a slit in one part. ing. The removal of the contents from the blister pack containing the toothbrush is performed by breaking the lid member triggered by the slit formed in the lid member.

As the bottom material of the blister pack,
When using an injection needle pack as the content, a polystyrene sheet or vinyl chloride resin sheet is extruded and coated with polyethylene to form a plastic sheet having a thickness of 0.1 to 0.4 mm as a molding material, and a concave portion for storing the content. In the case of using a molded product having the above and a toothbrush as a content, a thickness of about 0.1 to 0.4 mm made of a low crystalline or amorphous polyethylene terephthalate resin sheet or vinyl chloride resin sheet A molded body having a recess for storing contents, which uses the plastic sheet as a molding material, is used.

[0006]

By the way, the blister pack using the conventional paper lid material is unsanitary because paper dust is generated when the contents are taken out, and when it gets wet. Unable to maintain the sterility of the contents,
Since the lid material is opaque, the contents of the blister pack cannot be automatically detected by light from the lid material side. Since the lid material is made of paper, the moisture resistance and sealing performance are not perfect. There is a defect such as not being present.

Further, the blister pack using the conventional lid material made of paper is not supposed to take out the contents by the method of piercing the lid material by pushing up the contents from the outside of the bottom material with the fingertip, and therefore press-through. The contents cannot be taken out smoothly by.

Further, the blister pack containing the needle pack is expensive because the sterilized paper used for the lid is expensive, and the blister pack containing the toothbrush is 1
Since a lid member having a slit in its part is used, it has a drawback that dust easily enters the blister pack when the product is transported or sold at a store.

On the other hand, the present invention has excellent properties in transparency, sterility maintaining property and sealing property, and the contents can be taken out by press-through.
Moreover, the present invention provides a lid material that can provide a package that does not generate paper powder when the contents are taken out.

[0010]

According to the present invention, a polypropylene resin film irradiated with radiation such as γ-rays and electron beams has a decrease in strength and elongation, so that a press-through function for taking out the contents by pressing occurs. And, even if a reinforcing resin layer is laminated in order to compensate for the decrease in strength of the polypropylene resin film due to irradiation of radiation, the reinforcing resin layer is torn along with the polypropylene resin film, so the polypropylene resin film It has been confirmed that the lid member having the base material composed of the resin and the reinforcing resin layer is particularly suitable as a lid member for a blister pack, and has been completed.

That is, the lid material having the press-through function of the present invention is a lid material comprising a polypropylene resin film and a reinforcing resin layer laminated on the polypropylene resin film as a base material. The film is characterized by being deteriorated by irradiation of radiation.

The lid material having a press-through function of the present invention is a substrate comprising a uniaxially stretched polypropylene resin film or a biaxially stretched polypropylene resin film and a reinforcing resin layer laminated on the polypropylene resin film. The polypropylene resin film is deteriorated by irradiation of radiation.

Further, in the cover material having the press-through function of the present invention, the thickness of the polypropylene resin film is 10 to 10.
It is characterized by being 40 μm.

Furthermore, the cover material having the press-through function of the present invention is characterized in that the reinforcing resin layer has a thickness of 6 to 60 μm.

In the cover material having the press-through function of the present invention having the above structure, the polypropylene resin film has a thickness of 10 to 40 μm, preferably 15 to 35 μm.
The thing of about m is used. The polypropylene resin film can be provided with a printing layer that displays the product name of the contents, the usage method, and the like.

The polypropylene-based resin film in the lid material has a property of being easily broken when a force is applied to the lid material by pushing up the contents of a package such as a blister pack from the outside of the bottom material with a fingertip. It is necessary.

As the polypropylene resin film,
A uniaxially stretched film or a biaxially stretched film in which stretching in one direction is stronger than stretching in the other direction is preferable, and the tensile strength according to JIS K 6734 after irradiation with radiation is in the case of a uniaxially stretched polypropylene resin film. ,
In the case of a biaxially stretched polypropylene-based resin film of 4.0 to 12.0 kgf / mm ^{2 in} the stretched direction, 0.5 to 4.0 kgf / mm ^{2 in} the unstretched direction, and 4.0 to 12. ^{0kgf / mm 2, 0.5~4.0kgf / mm} 2 in the weak stretching direction, JIS K
The tensile elongation at break according to 6734 is 5.0 in the stretching direction in the case of a uniaxially stretched polypropylene resin film.
~ 50.0%, 0.5-5.0% in the unstretched direction,
In the case of a biaxially stretched polypropylene resin film, it is preferably 5.0 to 50.0% in the strong stretching direction and 0.5 to 5.0% in the weak stretching direction.

The reinforcing resin layer laminated on the polypropylene resin film is a resin layer which is not deteriorated by irradiation of radiation and has a property of being torn along with the polypropylene resin film after irradiation of radiation. , For example, radiation resistant polypropylene resin, linear low density polyethylene resin, low density polyethylene resin, medium density polyethylene resin, high density polyethylene resin, ionomer, cyclic polyolefin resin, polyester resin, polycarbonate resin, acrylic resin, polystyrene It is formed of resin or the like.

As the reinforcing resin layer, polyethylene resin is preferable in terms of material cost and manufacturing cost. In addition, linear low-density polyethylene resin, medium-density polyethylene resin, high-density polyethylene resin, ethylene-based ionomer and the like are particularly preferable because no strange odor is generated by irradiation with radiation.

The thickness of the reinforcing resin layer may be any as long as the lid material irradiated with radiation has a property that the reinforcing resin layer is torn by the polypropylene resin film, and the lid material is applied to the blister pack. Depending on the shape of the package and the weight of the contents, etc., about 6 to 60 μm is preferable.

The lamination of the polypropylene resin film and the reinforcing resin layer is carried out by extruding and coating the reinforcing resin layer through an adhesive layer formed on the polypropylene resin film as needed, or a plastic film to be the reinforcing resin layer. Any of the so-called dry laminating method in which is adhered with an adhesive may be used, but in terms of cost, it is preferable to form by the extrusion coating method.

Examples of the adhesive for laminating the polypropylene resin film and the reinforcing resin layer include polyester-based, urethane-modified polyester-based, partially urethane-modified polyester-based, polyether-based, and modified ether-type polyester-based adhesives. Propylene toluylene diisocyanate (TDI) and hexamethylene diisocyanate (HM
It is preferred to use a hardening agent such as DI).

The lid material having the press-through function of the present invention is laminated on a polypropylene resin film and the polypropylene resin film when the packaging material to which the lid material is applied requires oxygen barrier property and water vapor barrier property. In addition to the above-mentioned reinforcing resin layer, a barrier resin layer such as polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH), nylon, silicon oxide (SiO _x ) or An inorganic oxide vapor-deposited plastic film having an inorganic oxide vapor-deposited layer formed of aluminum oxide (Al ₂ O ₃ ) or the like can be laminated.

The lid material having the press-through function of the present invention is a lid material having a press-through function and also having an easy peel property by forming an easy-peel adhesive layer on one side. The easy-peel adhesive layer is determined in consideration of the material forming the bottom material. For example, polyester-based, polyolefin-based, EVA-based, vinyl chloride-vinyl acetate copolymer-based, polyacrylic-based, etc. Formed by the agent.

The radiation applied to the lid material of the present invention is γ-ray,
X-rays, electron rays, etc., but γ rays and electron rays are preferable,
It is also possible to use both in combination. The irradiation of radiation may be performed before or after the lid material is bonded to the bottom material.

The radiation dose depends on the thickness of the polypropylene-based resin film and the reinforcing resin layer forming the lid material, but the radiation-induced radiation deteriorates the strength to the extent that the polypropylene-based resin film performs the press-through function. In the case of electron beam irradiation, about 10 to 200 kGy, γ
In the case of line irradiation, it is preferably about 5 to 100 kGy. Further, if there is a special purpose such as sterilization of the inside of the package and the contents by irradiation with γ-rays, the irradiation amount may be higher than this.

[0027]

According to the lid member having the press-through function of the present invention, the contents can be easily taken out by so-called press-through in which the lid member is pierced by pushing up the contents from the outside of the bottom member of the package. A package is obtained.

Further, according to the lid material having the press-through function of the present invention, the packaging material has excellent properties in transparency, sterility maintaining property and sealing property, and does not generate paper powder when the contents are taken out. The body is obtained.

Further, in the cover material having the press-through function of the present invention, since the reinforcing resin layer is laminated on the polypropylene resin film which is deteriorated by the irradiation of radiation, the package body should be conscious of opening the package body. Unless there is a force to push the contents from the outside of the bottom material with your fingertips, there is no danger of breaking easily, avoiding unexpected situations where the lid material breaks during the distribution process of the package. it can.

[0030]

EXAMPLES The concrete constitution of the cover material having the press-through function of the present invention will be described below based on examples.

Reference Example 1 A raw film made of polypropylene resin as a raw material for film formation was stretched and oriented in a uniaxial direction of the machine direction at a stretching ratio of 3 times,
A uniaxially stretched polypropylene-based resin film having a thickness of 20 μm was obtained.

Reference Example 2 A raw film made of polypropylene resin as a raw material for film formation was stretched and oriented in a uniaxial direction of the machine direction at a stretch ratio of 4 times,
A uniaxially stretched polypropylene-based resin film having a thickness of 40 μm was obtained.

Reference Example 3 A raw film made of polypropylene resin as a raw material for film formation was stretch-oriented in the machine direction at a draw ratio of 3 times, and then stretched in a direction substantially perpendicular to the machine direction at a draw ratio of 1.5 times. Orient,
A biaxially oriented polypropylene resin film having a thickness of 20 μm was obtained.

Reference Example 4 An unstretched film having a thickness of 20 μm was obtained using a polypropylene resin as a raw material for forming a film.

Reference Example 5 A raw film made of polypropylene resin as a raw material for film formation was stretch-oriented in a machine direction and in a direction substantially perpendicular to the machine direction at a draw ratio of 3 times, and a biaxially stretched polypropylene system having a thickness of 20 μm. A resin film was obtained.

Reference Example 6 A raw film using a polyester resin as a raw material for film formation
Stretch orientation in a uniaxial direction of the machine direction at a draw ratio of 3 times,
A 20 μm thick uniaxially stretched polyester resin film was obtained.

[Experiment 1] Each film of Reference Examples 1 to 6 was irradiated with 25 kGy of γ-rays, and then JIS K
The tensile strength and tensile breaking elongation according to 6734 were measured.
The results are shown in [Table 1] and [Table 2].

[0038]

[Table 1]

[0039]

[Table 2]

Example 1 One surface of the uniaxially stretched polypropylene resin film of Reference Example 1 was subjected to corona discharge treatment to make the surface wetting property of the corona discharge treated surface 50 dyn. A liquid-curable polyester adhesive is coated to form a 2 μm-thick adhesive layer, and a reinforcing resin layer made of a linear low-density polyethylene resin layer having a thickness of 20 μm is provided on the adhesive layer surface with a heater temperature. The layers were laminated by an extrusion coating method at 290 ° C. During extrusion coating of the linear low-density polyethylene resin layer, the laminated surface of the linear low-density polyethylene resin layer was treated with ozone.

Thereafter, an 8 μm-thick easy-peel adhesive layer was formed on the surface of the linear low-density polyethylene resin layer with an olefin-based easy-peel heat sealant,
A laminated material for a lid material was obtained.

On the other hand, after coating a two-component curing type polyurethane adhesive to a thickness of 2 μm on one side of a 100 μm-thick sheet made of a γ-ray-resistant polyvinyl chloride resin, the coated surface has a linear shape of 30 μm A low-density polyethylene resin layer was formed by extrusion coating to obtain a laminated material for bottom material.

By vacuum forming using this laminated material for a bottom material as a molding material, a bottom material 2 for an injection needle pack having a concave portion 1 for accommodating contents is obtained in FIGS. 1 and 2. .
The bottom material 2 was formed such that the surface of the linear low-density polyethylene resin layer of the laminated material was the inner peripheral surface layer of the recess 1.

After the injection needle pack M, which is the content, is placed in the recess 1 of the bottom member 2, the surface of the easy-peel adhesive layer of the above-mentioned laminated material for lid member is sealed at a temperature of 150 ° C. and a sealing time of 0 By heat-sealing under a sealing condition of a sealing pressure of 3 kgf / cm ² for 2 seconds and further performing a sterilization treatment by γ-ray irradiation of 25 kGy, the lid material 3 having a press-through function, which is an embodiment of the present invention, Blister pack 4 was obtained.

The lid material laminate was heat-sealed to the bottom material so that the longitudinal direction of the injection needle pack M and the stretching orientation direction of the polypropylene resin film of the lid material laminate material were orthogonal to each other.

Example 2 The reinforcing resin layer in the laminated material for the lid material was formed from the high-density polyethylene resin by the extrusion coating method at a heater temperature of 300 ° C., and other conditions were the same as in Example 1.
A blister pack made of a lid material having a press-through function, which is an example of the present invention, was obtained.

Example 3 The reinforcing resin layer in the laminated material for the lid material was formed of the medium density polyethylene resin by the extrusion coating method at a heater temperature of 300 ° C., and other conditions were the same as in Example 1.
A blister pack made of a lid material having a press-through function, which is an example of the present invention, was obtained.

Example 4 The reinforcing resin layer in the laminated material for the lid material was formed by extrusion coating with an ethylene ionomer at a heater temperature of 300 ° C., and other conditions were the same as in Example 1.
A blister pack made of a lid material having a press-through function, which is an example of the present invention, was obtained.

Example 5 The reinforcing resin layer in the laminated material for the lid material was formed by an extrusion coating layer having a thickness of 40 μm made of a linear low density polyethylene resin, and other conditions were the same as in Example 1 and the present invention was used. A blister pack having a lid material having a press-through function, which is an example product, was obtained.

Example 6 The easy-peel adhesive layer in the laminated material for the lid material was formed with a polyester-based easy-peel heat sealant, and other conditions were the same as in Example 1 except that the example product of the present invention was used. A blister pack having a lid material having a certain press-through function was obtained.

Example 7 The uniaxially stretched polypropylene-based resin film of Reference Example 2 was used as the polypropylene-based resin film in the laminated material for the lid material, and other conditions were the same as in Example 1 and A blister pack made of a lid material having a press-through function was obtained.

Example 8 The biaxially stretched polypropylene resin film of Reference Example 3 was used as the polypropylene resin film in the laminated material for the lid material, and other conditions were the same as in Example 1 A blister pack made of a lid material having a press-through function was obtained.

The lid material laminated material is heated on the bottom material so that the longitudinal direction of the injection needle pack M, which is the content, and the strong stretching orientation direction of the polypropylene resin film of the lid material laminated material are orthogonal to each other. Sealed.

Example 9 One surface of the uniaxially stretched polypropylene resin film of Reference Example 1 was subjected to corona discharge treatment to make the surface wettability of the corona discharge treated surface 50 dyn. Liquid-curable polyester adhesive with a thickness of 2
μm to form an adhesive layer, and a reinforcing resin layer composed of a linear low-density polyethylene resin layer having a thickness of 40 μm is laminated on the surface of the adhesive layer by an extrusion coating method at a heater temperature of 290 ° C. did. During extrusion coating of the linear low-density polyethylene resin layer, the laminated surface of the linear low-density polyethylene resin layer was treated with ozone.

Then, after irradiating 30 kGy of γ-rays to this laminated film, an easy-peel adhesive layer is formed on the surface of the linear low-density polyethylene resin layer with an olefin-based easy-peel heat seal agent to form a lid material. A laminated material for use was obtained.

On the other hand, a bottom material having a concave portion for accommodating a toothbrush was obtained by vacuum forming using a polyester resin sheet having a thickness of 0.25 mm as a forming material.

After the toothbrush which is the content is placed in the concave portion of the bottom material, the surface of the easy peeling adhesive layer of the above-mentioned laminated material for the lid material is heat-sealed, and press-through which is an embodiment of the present invention. A blister pack having a lid material having a function was obtained.

The lid material laminate was heat-sealed to the bottom material so that the longitudinal direction of the toothbrush and the stretching orientation direction of the polypropylene resin film of the lid material laminate material were orthogonal to each other.

Example 10 The reinforcing resin layer in the laminated material for the lid material was formed of an extrusion coating layer of a linear low density polyethylene resin having a thickness of 4 μm, and other conditions were the same as in Example 1 and the present invention was used. A blister pack having a lid material having a press-through function, which is an example product, was obtained.

Example 11 The reinforcing resin layer in the laminated material for the lid material was formed by an extrusion coating layer having a thickness of 80 μm made of a linear low density polyethylene resin, and other conditions were the same as in Example 1 and the present invention was used. A blister pack having a lid material having a press-through function, which is an example product, was obtained.

Example 12 The reinforcing resin layer in the laminated material for the lid material was formed from the low density polyethylene resin by the extrusion coating method at the heater temperature of 300 ° C., and the other conditions were the same as in Example 1.
A blister pack made of a lid material having a press-through function, which is an example of the present invention, was obtained.

Example 13 In Example 1, the unstretched polypropylene resin film film of Reference Example 4 was used in place of the uniaxially stretched polypropylene resin film of the laminated material for the lid material, and other conditions were the same as those of Example 1. In the same manner, a blister pack having a lid material having a press-through function, which is an example product of the present invention, was obtained.

Example 14 In Example 1, the biaxially stretched polypropylene resin film film according to Reference Example 5 was used in place of the uniaxially stretched polypropylene resin film of the laminate material for the lid material, and other conditions were the same as those in Example 1. In the same manner as described above, a blister pack having a lid material having a press-through function, which is an example of the present invention, was obtained.

Example 15 One surface of the uniaxially stretched polypropylene resin film of Reference Example 1 was subjected to corona discharge treatment so that the surface wettability of the corona discharge treated surface was 50 dyn, and then the corona discharge treated surface was subjected to 2 Liquid-curable polyester adhesive with a thickness of 2
μm to form an adhesive layer, and a reinforcing resin layer composed of a linear low-density polyethylene resin layer having a thickness of 40 μm is laminated on the surface of the adhesive layer by an extrusion coating method at a heater temperature of 290 ° C. did. During extrusion coating of the linear low-density polyethylene resin layer, the laminated surface of the linear low-density polyethylene resin layer was treated with ozone.

Next, 100 kGy was added to this laminated film.
After applying the electron beam irradiation of, by forming an easy-peel adhesive layer with an olefin-based easy-peel heat seal agent on the linear low-density polyethylene resin layer surface,
A laminated material for a lid material was obtained.

On the other hand, a bottom material having a recess for accommodating a toothbrush was obtained by vacuum forming using a polyester resin sheet having a thickness of 0.25 mm as a forming material.

After the toothbrush which is the content is placed in the concave portion of the bottom material, the surface of the easy peeling adhesive layer of the above-mentioned laminated material for the lid material is heat-sealed, and press-through which is an embodiment of the present invention. A blister pack having a lid material having a function was obtained.

The lid material laminate was heat-sealed to the bottom material so that the longitudinal direction of the toothbrush and the stretching orientation direction of the polypropylene resin film of the lid material laminate material were orthogonal to each other.

Comparative Example 1 In Example 1, the uniaxially stretched polypropylene resin film of Reference Example 6 was used in place of the uniaxially stretched polypropylene resin film of the laminated material for the lid material, and other conditions were the same as those of Example 1. Similarly, a blister pack having a lid material for comparison was obtained.

Comparative Example 2 A commercially available blister pack using a lid material having an easy-peel adhesive layer formed by a polyester-based easy-peel heat sealing agent on sterilized paper was used as a blister pack with a lid material for comparison. I prepared.

[Experiment 2] Ease of opening each blister pack of Examples 1 to 15 and Comparative Examples 1 to 2 by press-through, and ease of opening by easy peel. I experimented with ease. In addition, the visibility of the contents in each blister pack from the lid material side and the presence or absence of generation of an offensive odor in each blister pack were inspected. The results are shown in [Table 3].

[0072]

[Table 3]

[0073]

According to the lid material having the press-through function of the present invention, due to the characteristics of the polypropylene resin film which is deteriorated by the irradiation of the radiation used for the lid material, A packaging body can be opened accurately by so-called press-through in which the lid material is pierced by pushing up the contents from the outside with a fingertip.

Further, since the lid member having the press-through function of the present invention has excellent transparency, it becomes a package in which the contents can be automatically detected by light or the like from the lid member side.

Further, according to the lid member having the press-through function of the present invention, no paper dust is generated when opening the package for taking out the contents, and moreover, the contents are sterilized even when wet with water. A package that can be held and has excellent properties in terms of hermeticity and moisture resistance is obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a blister pack obtained by using a lid member having a press-through function of the present invention.

FIG. 2 is a vertical sectional view of the blister pack shown in FIG.

[Explanation of symbols]

 1 ... Recess for storing contents 2 ... Bottom material of blister pack 3 ... Lid having press-through function 4 ... Blister pack M ... Contents in blister pack Thing (injection needle pack)

Claims (4)

[Claims] 1. A lid member comprising a polypropylene resin film and a reinforcing resin layer laminated on the polypropylene resin film as a base material, wherein the polypropylene resin film is deteriorated by irradiation of radiation. A lid material having a press-through function characterized by: 2. The polypropylene resin film is a uniaxially stretched film or a biaxially stretched film.
A lid material having the press-through function described in 1. 3. The lid material having a press-through function according to claim 1, wherein the polypropylene resin film has a thickness of 10 to 40 μm. 4. The cover material having a press-through function according to claim 1, wherein the reinforcing resin layer has a thickness of 6 to 60 μm.