JPWO2006013919A1 - Packaging container and medical packaging sheet - Google Patents

Abstract

A laminate comprising a base material layer and a surface layer formed of a thermoplastic resin having a melting point of 130 ° C. or higher, or a resin composition containing 50% by weight or more of the thermoplastic resin, the surface layer is located on the inner surface side of the container Thus, the lid material having air permeability and bacteria barrier property is heat-sealed along the peripheral edge of the container body formed into a predetermined shape.

Description

  The present invention is excellent in heat resistance at the time of thermoforming and the like, can effectively avoid sticking between the inner surface of the container and the contents, and further suitable for use as a medical packaging container having easy peelability of the lid. The present invention relates to a container and a medical packaging sheet suitable for use in such a packaging container.

  For example, a medical packaging container is known in which a container body is heat-sealed with a lid made of sterilized paper having air permeability and bacteria barrier properties. As an example of such a medical packaging container, Patent Document 1 discloses a structure in which an adhesive is laminated on the entire surface of the container main body which is the inner surface of the container, and a lid material is heat sealed. Japanese Patent Laid-Open No. 2004-133867 discloses that the sealing material can be completely sealed without impairing the air permeability of the lid material by providing the adhesive material conventionally provided on the lid material side on the container body side.

JP 2001-31146 A

  However, there is a known method of forming a desired container shape by heating a thermoplastic resin sheet between hot plates and forming it by plug-assisted pressure forming, but the applicant has conducted extensive research. As a result, when such a molding method is applied to the one disclosed in Patent Document 1 (paragraph numbers [0020] and [0021]), the adhesive may adhere to the hot plate when heated by the hot plate. The problem was found. If the heating temperature is lowered, such a problem can be avoided, but in this case, the sheet will be formed into a container shape with the internal distortion remaining in the sheet, and the container will be deformed due to heating during sterilization. New problems will arise.

  Further, in Patent Document 1, even if an adhesive is provided on the inner surface side of the container, the adhesive does not give any trouble to the contents (paragraph number [0021]). However, as in Patent Document 1, In the case where an adhesive is provided on the entire inner surface of the container, there has also been a problem that sticking (sticking) between the adhesive and the contents occurs. In particular, in the case of medical packaging materials that contain medical devices such as syringes, it is necessary to perform sterilization at a high temperature exceeding 100 ° C., so that the adhesive exposed to a high temperature environment melts or softens. In some cases, the contents adhere to the contents.

  Furthermore, sterilized paper used as a lid for this type of packaging container must ensure air permeability, and it is difficult to perform a treatment for easy peeling, and the lid is broken when opened. There were also problems such as paper dust mixing into the contents. For this type of packaging container, which is made by heat-sealing the lid on the container body, it is required that the lid can be easily peeled when the container is opened and the contents are taken out in addition to the tightness of the contents. Has been.

  The present invention has been proposed in order to solve the problems of the conventional techniques as described above, and is excellent in heat resistance at the time of thermoforming, and can effectively avoid sticking between the inner surface of the container and the contents. Furthermore, it aims at providing the packaging container suitable as a medical packaging container provided also with the sealing performance and easy peelability of a lid | cover material, and a medical packaging sheet suitable for using for such a packaging container. .

  The packaging container according to the present invention, which has been made to solve the above problems, is a packaging container formed by heat-sealing a lid material having air permeability and bacterial barrier properties along the periphery of the container body, The said container main body consists of a laminated body provided with a base material layer and the surface layer located in the container inner surface side, The said surface layer contains thermoplastic resin with melting | fusing point 130 degreeC or more, or the said thermoplastic resin 50weight% or more. It is set as the structure formed with the resin composition.

  By adopting such a configuration, the heat resistance of the surface layer at the time of heat forming can be improved, and there will be no hindrance to the forming. In addition, the surface layer functions as an adhesive layer in the heat-sealed part, and is exposed to the inner surface side of the container main body other than the heat-sealed part and is in contact with the contents. Thus, even when exposed to a high temperature environment such as sterilization, sticking between the surface layer and the contents can be effectively avoided.

  Further, in the packaging container according to the present invention, the lid material is any one of a porous film, a nonwoven fabric, a woven cloth, and sterilized paper, and the base material layer in the container body is made of a polypropylene resin or a polypropylene resin. It is formed by a resin composition containing at least wt%, and the surface layer in the container body is formed by a resin composition comprising 50 to 95 wt% polypropylene resin and 5 to 50 wt% polyethylene resin. Is preferred.

  By adopting such a configuration, it is possible to improve the heat resistance of the surface layer at the time of thermoforming and to ensure the easy peelability of the lid material at the time of opening the container. At this time, when the porous film, non-woven fabric or woven fabric used as the cover material is made of a polyethylene resin, the melting point of the polypropylene resin blended in the resin composition forming the surface layer is 130 ° C. or higher. It is preferable to use random polypropylene. Thereby, moderate adhesion | attachment of resin is obtained between the polyethylene-type resin components of a surface layer, without destroying the cover material which consists of a polyethylene-type resin with low melting | fusing point.

  Moreover, when using highly heat-resistant sterilized paper for a lid | cover material, it is preferable that the polypropylene resin mix | blended with the resin composition which forms the said surface layer is a homo polypropylene. Thereby, the heat resistance of the surface layer is further improved, and sticking between the contents and the surface layer can be more effectively avoided.

Furthermore, it is preferable that the polyethylene resin blended in the resin composition forming the surface layer is either linear low density polyethylene (LLDPE) or low density polyethylene (LDPE). The density of such a low-density polyethylene resin approximates the density (0.9 g / cm ³ ) of the polypropylene resin. Thereby, the uniformity of the density distribution of the resin composition which forms a surface layer is maintained, and the visibility of the content can be ensured in the packaging container in which transparency is required.
The low-density polyethylene resin to be blended in the resin composition forming the surface layer has a ^density, is preferably ^{0.89g / cm 3 ~0.92g / cm 3} .

  Such a packaging container according to the present invention contains a medical instrument such as a syringe, a medicine-filled syringe, gauze, tweezers, or a scalpel as contents, and heat-sealing the lid, and then 110 ° C. or higher, preferably 120 It can be suitably used as a packaging container that is sterilized at a temperature of ℃ or higher.

  Further, the medical packaging sheet according to the present invention is a medical packaging sheet used for heat-sealing a lid material having air permeability and bacteria barrier properties and containing a medical device as a content. It is provided with a laminated structure in which a surface layer is laminated on the surface side in contact with the contents of the material layer, and the surface layer is formed of a thermoplastic resin having a melting point of 130 ° C. or higher, or a resin composition containing 50% by weight or more of the thermoplastic resin. The configuration is as follows.

  The medical packaging sheet according to the present invention having such a configuration is suitably used as a laminate for forming the container body in the packaging container according to the present invention, and has excellent heat resistance of the surface layer at the time of thermoforming, and a lid material. When heat sealed and used as a container, sticking between the surface layer and the contents can be effectively avoided.

  According to this invention, the packaging container excellent in heat resistance at the time of thermoforming etc. can be obtained. Furthermore, the sticking between the inner surface of the container and the contents can be effectively avoided, and the lid material, the resin for forming the base material layer, and the resin for forming the surface layer can be made into a specific combination to facilitate the lid material. It can be set as the packaging container provided also with peelability.

  Hereinafter, preferred embodiments of the present invention will be described. In the present invention, the laminate forming the container body may be, for example, extruding each of the resin forming the base layer and the resin forming the surface layer from an extruder and laminating them while adhering them with a die or the like. A sheet formed by a co-extrusion method or the like can be used.

  In addition, the packaging container according to the present invention is obtained by heat-sealing the lid material along the periphery of the container body, and the form of the container body appropriately adopts various forms according to the shape of the contents. Can do. For example, when the content is thin such as gauze, the content is sandwiched between the surface layer side of the laminate formed in a sheet shape and the lid, and the periphery of the content is heat sealed, You may make it cut an unnecessary part, and the lid | cover material should just be heat-sealed along the periphery of a container main body (laminated body) as a result.

  In addition, when the contents have a three-dimensional shape such as a syringe, for example, a laminate formed in a sheet shape is sandwiched between heating plates and heated to a molding temperature, and the surface layer is positioned on the inner surface of the container. In this way, the container body is made into a form that can accommodate the contents by an appropriate molding means such as molding by plug-assisted pressure forming, and the lid member is formed along the periphery of the opening of the container body. What is necessary is just to form the flange part for heat-sealing.

  The base material layer provided in the laminate forming the container body is usually formed of a thermoplastic resin that can be molded into a desired container shape, and at least has a bacteria barrier property that blocks the permeation of bacteria. In view of heat resistance and transparency of the container body, it is preferable to form a polypropylene resin or a resin composition containing polypropylene resin at 50% by weight or more, preferably 70% by weight or more. Polypropylene and / or random polypropylene are particularly preferred. In addition, the base material layer can also be made into the multilayer structure which laminated | stacked the resin layer for adding or supplementing the air non-permeability which blocks | prevents permeation | transmission of air, water vapor | steam barrier property, etc. as needed.

  The surface layer is formed of a thermoplastic resin having a melting point of 130 ° C. or higher, or a resin composition containing 50% by weight or more, preferably 60% by weight or more of the thermoplastic resin. Thereby, the heat resistance of the surface layer at the time of thermoforming as described above can be improved, and the molding is not hindered. Further, the surface layer functions as an adhesive layer in the heat-sealed part, but it is exposed on the inner surface side of the container body outside the heat-sealed part and is in contact with the contents. By using the above resin, sticking between the surface layer and the contents can be effectively avoided even when exposed to a high temperature environment such as sterilization treatment. The thickness of the surface layer is usually 1-100 μm, preferably 10-50 μm, considering the heat sealability with the lid.

  Such a surface layer is made of, for example, a resin composition comprising 50 to 95% by weight of polypropylene resin, preferably 60 to 80% by weight, and 5 to 50% by weight of polyethylene resin, preferably 20 to 40% by weight. Preferably formed. In this case, if the ratio of blending polypropylene is less than the above range, the heat resistance of the surface layer becomes insufficient, and if the ratio of blending polypropylene exceeds the above range and the ratio of polyethylene resin decreases, heat sealing It becomes inadequate.

  In the case where sterilized paper is used for the lid, and the resin composition comprising a polypropylene resin and a polyethylene resin is used as the resin forming the surface layer, the polypropylene resin is a homopolypropylene. The polyethylene resin is preferably either a linear low density polyethylene (LLDPE) or a low density polyethylene (LDPE).

  Thus, the heat resistance of a surface layer can be improved by mix | blending a polypropylene-type resin with the resin which forms a surface layer in a comparatively high ratio. As a result, the heat resistance of the container itself is improved, and it is needless to say that the hermeticity of the container can be maintained even when exposed to a high temperature environment. When performing heat molding, the resin forming the surface layer adheres to the hot plate even if the molding is performed at a high temperature by heating to the molding temperature of the polypropylene resin forming the base material layer. The appearance quality of the resulting packaging container is not impaired by the surface shape being transferred to the surface layer. Furthermore, by increasing the molding temperature, the internal distortion of the laminate can be removed, and the deformation of the container after molding, in particular, the deformation of the container due to heating such as sterilization treatment can be prevented. It is also possible to prevent the cover material from peeling off due to the deformation.

Moreover, if homopolypropylene is used for the polypropylene resin blended in the resin composition forming the surface layer, the heat resistance of the surface layer can be further improved, and the sticking between the contents and the surface layer can be made more effective. It can be avoided. Furthermore, as the polyethylene resin to be blended in the resin composition for forming the surface layer, for example, LLDPE, LDPE, etc., the density of which approximates the density (0.9 g / cm ³ ) of the polypropylene resin (preferably is the use of the low-density polyethylene) of density ^{0.89g / cm 3 ~0.92g / cm 3} , it is possible to maintain uniformity of the density distribution of the resin composition forming the surface layer. Thereby, the visibility of the contents can be ensured without impairing the transparency of the container body. In particular, metallocene LLDPE polymerized using a metallocene catalyst exhibits a density close to that of homopolypropylene and approximates the refractive index, so that homopolypropylene and / or polypropylene resin blended into the base material layer and the surface layer is used. Alternatively, an embodiment in which random polypropylene is used and the polyethylene resin blended in the surface layer is a metallocene LLDPE is particularly suitable for ensuring the transparency of the container body.

  On the other hand, the lid material has a bacteria barrier property and allows sterilization gas to permeate during sterilization of the contents, and after air sterilization to allow air replacement of the sterilization gas, can be heat sealed to the container body. Although it will not specifically limit if it is a thing, It is preferable to use either a porous film, a nonwoven fabric, a woven fabric, or a sterilized paper. If these materials are used as a cover material, a resin that forms a surface layer melted at the time of heat sealing enters a large number of holes opened on the surface and gaps between fibers, and mechanical bonding and / or a cover by the anchor effect. Due to the chemical compatibility between the cover material and the surface layer, it is possible to exert an appropriate adhesiveness between the cover material and the surface layer. Adhesiveness contributes to the easy release of the lid. At this time, if a porous film, a nonwoven fabric or a woven fabric made of polyethylene resin is used, the lid material and the surface layer are also affected by the chemical compatibility with the polyethylene resin blended in the surface layer of the container body. Appropriate adhesiveness can be obtained, which is preferable in that the easy-peeling property of the lid material is appropriately exhibited.

  Furthermore, in the present invention, as the lid material, any one of a porous film, a nonwoven fabric, a woven fabric, and sterilized paper is used, and the base material layer in the container body is made of the above-described polypropylene resin or polypropylene resin. Preferably, the surface layer in the container body is formed of a resin composition comprising a polypropylene resin and a polyethylene resin as described above.

  In the present invention, the heat resistance at the time of molding of the packaging container according to the present invention is improved by using such a combination of the material for the lid, the resin for forming the base layer, and the resin for forming the surface layer. At the same time, the easy peelability of the lid material when the container is opened can be exhibited.

  That is, the compatibility of the surface layer and the base material layer is improved by blending the same type of polypropylene resin as the resin forming the base material layer with the resin that forms the surface layer. The adhesiveness can be made strong. On the other hand, as described above, the porous film, nonwoven fabric, woven fabric, or sterilized paper can exhibit appropriate adhesiveness between the lid member and the surface layer. For this reason, the balance of the interlayer adhesive strength between the base material layer and the surface layer and between the lid material and the surface layer can exhibit the easy peelability of the lid material while ensuring the sealing performance of the container. it is conceivable that. At this time, if a porous film, a nonwoven fabric, or a woven fabric is made of a polyethylene resin, an appropriate adhesion between the resins can be obtained with the polyethylene resin component of the surface layer. It becomes easy to adjust the balance. An easy peeling structure such as “Magic Top” manufactured by Idemitsu Unitech Co., Ltd. may be used to exhibit the easy peeling property of the lid.

  The packaging container according to the present invention as described above contains a medical instrument such as a syringe, a medicine-filled syringe, gauze, tweezers, or a scalpel as contents, and after heat-sealing the lid, is preferably 110 ° C. or higher. Can be suitably used as a packaging container that is sterilized at a temperature of 120 ° C. or higher, but is also used as a medical packaging container that is subjected to sterilization that does not require high-temperature heat treatment such as EGO sterilization. Needless to say, you can.

  Hereinafter, the present invention will be described in more detail with reference to specific examples.

[Example 1]
(1) Using the following materials for the surface layer and the base material layer, a laminated sheet was produced by a coextrusion method so that the surface layer was 15 μm and the base material layer was 400 μm.
(I) Surface layer Homopolypropylene (made by Idemitsu Petrochemical: E-304GP) 60% by weight and metallocene LLDPE (made by Nippon Polyethylene: Kernel KF370) 40% by weight Resin composition (ii) Base material layer Homopolypropylene ( (Idemitsu Petrochemical: E-304GP)
(2) The laminated sheet obtained in (1) above is sandwiched between hot plates and heated to 155 ° C. so that the surface layer is positioned on the inner surface of the container, and the peripheral edge of the opening is formed by plug-assisted pressure forming. Ten container bodies having a predetermined shape with a flange portion formed thereon were obtained. The same syringe is put in all of the container main bodies, and about five of the ten containers obtained, a cover body (made by DuPont: Tyvek) made of HDPE (high density polyethylene) nonwoven fabric is used. The opening was covered and heat sealed to the flange at a temperature of 150 ° C. and a heating time of 2.5 seconds. About the remaining 5 containers, the opening part of the container main body was covered using the sterilized paper (Dai Nippon Printing), and it heat-sealed to the flange part at the temperature of 190 degreeC and the heating time for 2.5 seconds.

[Example 2]
(1) A laminated sheet was obtained in the same manner as in Example 1 except that the following materials were used for the surface layer and the base material layer.
(I) Surface layer A composition comprising 70% by weight of homopolypropylene (Idemitsu Petrochemicals: E-304GP) and 30% by weight of metallocene LLDPE (manufactured by Nippon Polyethylene: Kernel KF370) (ii) Base layer Homopolypropylene (Idemitsu) (Petrochemical: E-304GP)
(2) Except for using the laminated sheet obtained in (1) above, in the same manner as in Example 1, 5 containers each having two types of lids heat-sealed on the container body containing the syringe, A total of 10 were obtained.

[Example 3]
(1) A laminated sheet was obtained in the same manner as in Example 1 except that the following materials were used for the surface layer and the base material layer.
(I) Surface layer A composition comprising 70% by weight of random polypropylene (Idemitsu Petrochemicals: F744NP) and 30% by weight of metallocene LLDPE (Nippon Polyethylene: Kernel KF370) (ii) Base layer Homopolypropylene (Idemitsu Petrochemical) (Made by: E-304GP)
(2) Except for using the laminated sheet obtained in (1) above, in the same manner as in Example 1, 5 containers each having two types of lids heat-sealed on the container body containing the syringe, A total of 10 were obtained.

[Example 4]
(1) A laminated sheet was obtained in the same manner as in Example 1 except that the following materials were used for the surface layer and the base material layer.
(I) Surface layer Resin composition comprising 70% by weight of homopolypropylene (Idemitsu Petrochemical: E-304GP) and 30% by weight of LDPE (Tosoh: Petrocene 203) (ii) Base material layer Homopolypropylene (Idemitsu Petrochemical) (Made by: E-304GP)
(2) Except for using the laminated sheet obtained in (1) above, in the same manner as in Example 1, 5 containers each having two types of lids heat-sealed on the container body containing the syringe, A total of 10 were obtained.

[Example 5]
(1) A laminated sheet was obtained in the same manner as in Example 1 except that the following materials were used for the surface layer and the base material layer.
(I) Surface layer A resin composition comprising 60% by weight of homopolypropylene (Idemitsu Petrochemical: E-304GP) and 40% by weight of LDPE (Tosoh: Petrocene 203) (ii) Base material layer Homopolypropylene (Idemitsu Petrochemical) (Made by: E-304GP)
(2) Except for using the laminated sheet obtained in (1) above, in the same manner as in Example 1, 5 containers each having two types of lids heat-sealed on the container body containing the syringe, A total of 10 were obtained.

[Example 6]
(1) A laminated sheet was obtained in the same manner as in Example 1 except that the following materials were used for the surface layer and the base material layer.
(I) Surface layer Resin composition comprising 70% by weight of random polypropylene (made by Idemitsu Petrochemical: F744NP) and 30% by weight of LDPE (made by Tosoh: Petrocene 203) (ii) Base material layer Homopolypropylene (made by Idemitsu Petrochemical: E-304GP)
(2) Except for using the laminated sheet obtained in (1) above, in the same manner as in Example 1, 5 containers each having two types of lids heat-sealed on the container body containing the syringe, A total of 10 were obtained.

[Comparative Example 1]
(1) Using the following materials for the surface layer and the base material layer, a laminated sheet was produced by a coextrusion method so that the surface layer was 15 μm and the base material layer was 400 μm.
(I) Surface layer Ethylene vinyl acetate (Mitsui DuPont Polychemicals: Everflex P2505G)
(Ii) Substrate layer Homopolypropylene (Idemitsu Petrochemical: E-304GP)
(2) Although the laminated sheet obtained in (1) was sandwiched between hot plates and heated to 155 ° C., the sheets adhered to the hot plate and could not be molded.

[Comparative Example 2]
The same laminated sheet as in Comparative Example 1 was heated by being sandwiched between hot plates so that the surface layer side was 100 ° C. and the substrate layer side was 140 ° C., and the surface layer was positioned on the inner surface side of the container. 10 container bodies having a predetermined shape in which a flange portion was formed on the periphery of the opening were obtained. The obtained container main body was not good in mold reproducibility. Moreover, the same syringe is put into all of the obtained container main bodies, and the cover material (made by DuPont: Tyvek) made of a nonwoven fabric made of HDPE (high density polyethylene) is used for five of the obtained ten containers. Then, the opening of the container main body was covered and heat sealed to the flange portion at a temperature of 150 ° C. and a heating time of 2.5 seconds. About the remaining 5 containers, the opening part of the container main body was covered using the sterilized paper (Dai Nippon Printing), and it heat-sealed to the flange part at the temperature of 190 degreeC and the heating time for 2.5 seconds.

  In addition, the melting point of the homopolypropylene (made by Idemitsu Petrochemical: E-304GP) used for the surface layer in Examples 1, 2, 4, and 5 is 161 ° C., and the random polypropylene used for the surface layer in Examples 3 and 6 The melting point of polypropylene (Idemitsu Petrochemical: F744NP) was 132 ° C. In addition, the melting point of ethylene vinyl acetate (Mitsui DuPont Polychemicals: Everflex P2505G) used in Comparative Examples 1 and 2 was 80 ° C.

[Evaluation criteria]
Each container obtained in Examples 1 to 6 and Comparative Examples 1 and 2 was sterilized by an autoclave at 121 ° C., and then evaluated for the following (a) to (f). The results are shown in Table 1.

(A) Easy peelability of the lid material After the sterilization treatment, after the container returns to room temperature, there is no container each using a Tyvek as the lid material and a container using sterilized paper as the lid material. The lid was peeled off from the container body. The resistance felt when the lid was peeled off by hand was evaluated (sensory evaluation), and the peeled state of the lid and the presence or absence of tearing were visually observed. However, when the lid of the taken-out container had peeled even part from the flange, the container was replaced with a container from which the lid was not peeled.

  Here, among the containers of Comparative Example 2, the one using sterilized paper for the lid has a large resistance when the lid is peeled off by hand, and if it is forcibly removed, a part of the lid on the bonding surface side is thin. It peeled off and stuck to the container flange, or the lid material was torn. In addition, in the case of using Tyvek as the lid material, the lid material was not torn, but the resistance when peeled by hand was large and difficult to remove. The evaluation of Comparative Example 2 was evaluated as x, and when the lid material was not torn and the resistance when peeling the lid material was weaker than Comparative Example 2, the evaluation was rated as ◯ because the lid material was excellent in easy peelability.

(B) Sticking property In the case where at least one of the obtained 10 containers was in contact with the inner surface of the container main body, the evaluation was x. Moreover, about the obtained 10 containers, when the part which contact | connects the container inner surface of a syringe is not sticking with the inner surface of a container main body, the evaluation was set as (circle).

(C) Appearance evaluation Among the obtained 10 containers, any one of which the plug line is clearly visible, the surface of the hot plate is transferred to the container surface, and the container has dents and distortions. In the case where such a phenomenon can be confirmed, the evaluation is x. In addition, if any defect phenomenon cannot be confirmed for all 10 containers, the evaluation is ○, and the plug line is slightly visible, but the other two defect phenomena are not visible for all containers. The evaluation was △.

(D) Presence / absence of bag breakage Even if one of the 10 containers obtained had a lid peeled from the flange of the container, the evaluation was x. In addition, in the obtained 10 containers, when none of the lid members were peeled off from the flanges of the containers, the evaluation was evaluated as “good”.

(E) Hot plate adhesion In the heating step before thermoforming, whether or not the sheet heated between the hot plates adheres to the hot plate when leaving the hot plate was visually observed. The evaluation that the sheet did not adhere to the hot plate was evaluated as “good”. Although some sheets adhere to the hot plate, the evaluation is Δ for those that do not hinder molding. Moreover, the evaluation was set as x about the thing which the sheet adhered to the hot plate and could not be molded. The temperature of the hot plate was such that the mold reproducibility was good (155 ° C.), but only in Comparative Example 2, the temperature on the surface layer side was 100 ° C., and the temperature on the base material layer side was 140. C.

(F) Transparency In the container obtained in Comparative Example 1, the side surface of the container became cloudy, and it was difficult to see the syringe (cylinder part) as the contents. The evaluation is x based on this transparency. On the other hand, although the syringe (cylinder part) which is a content can be visually recognized from the side surface of a container, when it is not clear, the evaluation was set to (triangle | delta). Moreover, when the syringe (cylinder part) which is a content can be visually recognized clearly from the side of a container, the evaluation was set as (circle). The cylinder part of the syringe is made of PP and has a whitish appearance like ground glass, so it is very difficult to see if the transparency of the container side is poor.

  As described above, the packaging container according to the present invention can be widely used for applications such as medical packaging containers.

Claims (7)

  A packaging container formed by heat-sealing a lid having air permeability and bacteria barrier properties along the periphery of the container body, the container body having a base material layer and a surface layer located on the container inner surface side; A packaging container, wherein the surface layer is formed of a thermoplastic resin having a melting point of 130 ° C. or higher, or a resin composition containing 50% by weight or more of the thermoplastic resin. The lid material is any one of a porous film, a nonwoven fabric, a woven fabric, and sterilized paper, and the base material layer in the container body is formed of a polypropylene resin or a resin composition containing 50% by weight or more of a polypropylene resin. The packaging container according to claim 1, wherein the surface layer of the container body is formed of a resin composition comprising 50 to 95% by weight of a polypropylene resin and 5 to 50% by weight of a polyethylene resin.   The packaging container according to claim 2, wherein the porous film, the nonwoven fabric, or the woven fabric is made of a polyethylene resin.   The packaging container according to claim 2 or 3, wherein the polypropylene resin blended in the resin composition forming the surface layer is homopolypropylene and / or random polypropylene.   The packaging container according to claim 2, 3 or 4, wherein the polyethylene resin blended in the resin composition forming the surface layer is either linear low density polyethylene or low density polyethylene.   The packaging container according to any one of claims 1 to 5, wherein a sterilization treatment is performed at a temperature of 110 ° C or higher after housing a medical instrument as contents and heat-sealing the lid.   A medical packaging sheet for heat-sealing a lid material having air permeability and bacteria barrier properties and containing a medical device as a content, and a surface layer on a surface side in contact with the content of a base material layer A medical packaging sheet, characterized in that the surface layer is formed of a thermoplastic resin having a melting point of 130 ° C. or higher, or a resin composition containing 50% by weight or more of the thermoplastic resin. .