JP2011245734A - Sterilization paper, packaging material for sterilization, bag for sterilization and lid material for sterilization - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sterilization paper, a packaging material for sterilization, a bag for sterilization and a lid material for sterilization exhibiting sufficient air permeability, having no physical structure change in a seal edge of the sterilization paper, having physical strength hard to be broken even by rapid decomposition operation in sterilization, capable of forming a firm heat seal part, capable of suppressing paper dust in tearing, and excellent in mechanical properties, sanitary properties and working efficiency.SOLUTION: The sterilization paper 1 includes: a sterilization paper base material 2 through which microorganisms cannot pass but gas can pass; and a nonwoven fabric 3 laminated on one surface of the sterilization paper base material 2 via a thermoplastic resin 4. The thermoplastic resin 4 includes a plurality of linear thermoplastic resins 4.

Description

  The present invention relates to sterilized paper, sterilization packaging materials, sterilization bags, and sterilization lids.

  More specifically, the present invention has sufficient air permeability, is not easily broken even by a rapid decompression operation at the time of gas sterilization, can form a strong heat-sealed portion that does not peel off, and is difficult to tear by sterilizing paper. The present invention relates to a sterilized paper, a sterilization packaging material, a sterilization bag, and a sterilization lid that are excellent in mechanical suitability, hygiene, and workability, and that can suppress paper dust generated when the sterilized paper is torn.

  In the present invention, gas sterilization refers to both ethylene oxide gas (hereinafter referred to as EOG) sterilization and steam sterilization.

  Conventionally, one surface of a bag body formed by heat-sealing the edge of a film having heat sealability, or a bag body partially using sterilized paper is known (see, for example, Patent Document 1). . Alternatively, sterilized paper is used as a lid for heat-sealing and sealing the opening, or the contents are stored in a molded container made of a heat-sealable film packaging material partially using sterilized paper, and EOG sterilization, or In addition, packages and the like subjected to steam sterilization are distributed (for example, see Patent Document 2).

  Here, the sterilized paper is a general term for paper or non-woven fabric having gas permeability and microbial impermeability.

  As the paper-based sterilized paper, paper made from pulp dissolved in water, for example, paper made of uncoated paper, non-woven fabric, Japanese paper or the like can be used. Since the contents of a package that uses sterilized paper generally respects hygiene such as medical equipment, usually 100% pulp paper is used, but if necessary, thermoplastic resin fibers other than pulp may be used. It may be used or mixed with pulp. In addition, a sizing agent for bonding fibers and a water repellent agent for avoiding a change in pore size due to water absorption during steam sterilization or a decrease in physical strength may be mixed during papermaking.

  Non-woven fabric-based sterilized paper is a flash spinning / thermal bond type nonwoven fabric in which molten thermoplastic resin is ejected into fibers from nozzles to form network fibrils, and then the fibers are thermally fused together. Yes. And as such a nonwoven fabric, Tyvek (made by DuPont Japan Limited), Luxer (made by Asahi Kasei Kogyo Co., Ltd.), etc. can be used, for example.

  High density polyethylene or the like is used as the thermoplastic resin. Non-woven fabric-based sterilized paper made of high-density polyethylene can be heat-sealed with polyethylene film, and the heat-sealed part is made into a film by heat and pressure, so it can obtain strong heat-sealing strength and tear by hand It is a sterilized paper with excellent physical strength that is impossible. However, when nonwoven fabric-based sterilized paper made of high-density polyethylene is heat-sealed, the heat-sealed portion loses the voids of the nonwoven fabric due to heat and pressure, and almost forms a film. There is a slight portion that contacts the side surface of the seal bar along the seal bar that has digged into the object to be sealed, and heat may be applied to that portion, and pressure may not be applied. For this reason, the physical structure of the nonwoven fabric by high temperature changes, and there exists a possibility that microorganisms impermeability cannot be guaranteed. Furthermore, if an excessive tension is applied immediately after heat sealing, the heat sealing portion is extended, and microorganisms can permeate and become a problem. However, there is no inspection method for the permeation of microorganisms, and the actual situation is that they are used in an uncertain situation.

  Non-woven fabric-based sterilized paper has the above-mentioned serious problems, but there is no solution to it, and the product quality is managed by managing the mechanical conditions of the heat-sealing device and sampling the heat-sealed material. The current situation is that it has only been implemented. In addition, since the material is high-density polyethylene, it is impossible to obtain a heat-resistant polypropylene and a stable and strong heat-seal strength, so a film or container for steam sterilization having a heat-seal layer made of polypropylene and sterilized paper In the case of heat sealing, it is necessary to apply a heat sealing agent for polypropylene to the nonwoven fabric-based sterilized paper over the entire surface. However, even if a heat sealant is applied to sterilized paper in this way, sufficient heat seal strength may not be obtained. Particularly, in order to impair the air permeability, the container becomes violent due to a rapid decompression operation during sterilization. There exists a problem which expand | swells and a heat seal part peels or a bag breaks.

  By the way, since the paper-based sterilized paper has high heat resistance of the pulp, the physical structure of the sterilized paper is not changed at the seal edge. Although the heat-sealability of 100% pulp sterilized paper does not have heat-sealability, the heat-sealable film resin melted and entangled with the heat-sealable film by applying heat and pressure on the heat-sealable film. For this reason, the apparent heat seal strength can be obtained to such an extent that the sterilized paper cohesively breaks when the heat seal portion is peeled off. In addition, even in a sterilized paper mixed with a thermoplastic resin fiber having heat sealability, when the heat seal portion is peeled off, the sterilized paper is coherently broken, so that a strong heat seal strength cannot be obtained anyway. Furthermore, since paper-based sterilized paper has low physical strength and can be torn by hand, when opening a package using paper-based sterilized paper, the paper dust is scattered by accidentally tearing the sterilized paper. Therefore, there are hygiene problems when used for packaging medical devices.

  Further, even if a water repellent is applied or impregnated on sterilized paper, the pulp absorbs water vapor during steam sterilization, and the physical strength of the sterilized paper is further reduced than when dried. For this reason, there is a possibility that the sterilized paper may be torn and the heat seal portion may be coherently broken due to inability to withstand sudden pressure reduction in the sterilization pot during sterilization. For this reason, the decompression operation at the time of sterilization must be performed gradually, which contributes to a decrease in the efficiency of the sterilization work. The problem that the pulp of the sterilized paper absorbs moisture and the physical strength is lowered occurs not only with steam sterilization but also with EOG sterilization because water vapor is introduced before the introduction of EOG. Further, if the contents inside the sterilized paper have protrusions, the sterilized paper may be broken through in the worst case, so it is necessary to limit the contents.

  Although the sterilized paper currently distributed has the above-mentioned problems, no solution has been proposed.

  In order to solve the above-mentioned problems related to sterilized paper, a paper-based sterilized paper that does not have a physical structural change of the seal edge is used, and a reinforcing material having heat sealability is bonded while maintaining air permeability. good. Conventionally, as a method capable of bonding paper or non-woven fabrics while maintaining air permeability, a method of joining a base having water absorption and a surface material through a linear adhesive resin layer (for example, Patent Document 3), or a method of attaching paper or a nonwoven fabric through an adhesive layer in which the adhesive is applied in a scattered manner rather than the entire surface (for example, see Patent Document 4).

  However, in the conventional device for bonding paper or nonwoven fabric, the composite sheet after lamination is not breathable. In addition, when pasting paper or non-woven fabric through an adhesive layer with scattered adhesive, since the adhesive has no heat sealability, when such paper is overlaid with a film and heat sealed, An unsealed part is formed by the gap between the nonwoven fabric and the adhesive-attached portion, and the impermeability of the bacteria cannot be guaranteed. Accordingly, the problems inherent to sterilized paper described above have not been solved, and the present situation has been reached.

JP 2001-286538 A JP2003-221074A Japanese Patent Laid-Open No. 10-129739 Japanese Patent Laid-Open No. 5-220880

  The present invention has been made in consideration of such points, has a sufficient air permeability, does not change the physical structure of the seal edge of the sterilized paper, and is not easily broken even by a rapid decompression operation during sterilization. Sterilized paper and packaging material for sterilization that have excellent mechanical suitability, hygiene, and workability, have strength, can form a strong heat seal part, and can suppress paper dust generated during tearing An object of the present invention is to provide a sterilization bag and a sterilization lid.

  The present invention comprises a sterilized paper base that is permeable to microorganisms but is gas permeable, and a non-woven fabric that is laminated on at least one surface of the sterilized paper base via a large number of linear thermoplastic resins. This is a sterilized paper.

  The present invention is a sterilized paper characterized in that the nonwoven fabric is laminated on both surfaces of a sterilized paper base via a large number of linear thermoplastic resins.

  The present invention is a sterilized paper characterized in that the nonwoven fabric is made of a material having heat sealability.

  The present invention is a sterilized paper characterized in that the nonwoven fabric has a polypropylene layer on the surface of the thermoplastic resin, and each linear thermoplastic resin is made of a melt-extruded polypropylene resin that is welded to the polypropylene layer of the nonwoven fabric.

  The present invention comprises the above-described sterilized paper and a synthetic resin base film, wherein the peripheral edge of the sterilized paper and the peripheral edge of the base film are joined by heat sealing. It is a packaging material.

  The present invention comprises the above-described sterilized paper and a synthetic resin base film, wherein the peripheral edge of the sterilized paper and the peripheral edge of the base film are joined by heat sealing, and has a storage space inside. The sterilization bag is characterized.

  The present invention comprises the above-described sterilized paper and a synthetic resin base film, wherein the peripheral edge of the sterilized paper and the peripheral edge of the base film are joined by heat sealing, and has a storage space inside. The sterilization container is characterized.

  The present invention provides a lid for sterilization comprising the above-described sterilized paper, wherein the lid is attached to an opening provided in a container made of a synthetic resin that forms a storage space therein. It is.

  According to the present invention, gas permeability is maintained between a large number of linear thermoplastic resins, so that the gas permeability of sterilized paper can be maintained. In addition, since paper-based sterilized paper has a surface made of a heat-sealable nonwoven fabric, the material, basis weight, and physical strength of the nonwoven fabric are selected to be applied to the sterilized paper and the packaging material for sterilization. The physical strength can also be adjusted. Therefore, it is possible to provide sterilized paper and sterilization packaging material having gas permeability and heat seal strength according to the pressure reduction rate during gas sterilization, and physical strength according to the contents and transportation conditions.

  As a result, the gas sterilization cycle can be accelerated, and the productivity, quality stability, and cost of the gas sterilization process can be improved. In addition, paper-based sterilized paper cannot be used due to a lack of physical strength, and the sterilized paper of the present invention is used in place of the non-woven fabric-based sterilized paper that has been endured even when gas permeability and heat seal strength are low. Can be used.

  In addition, since the sterilized paper has a sterilized paper base material and a nonwoven fabric laminated on the sterilized paper base material, the sterilized paper and the packaging material for sterilization are difficult to tear. Paper dust to be reduced can be reduced. Furthermore, in the sterilized paper processing process, since at least one surface that contacts the processing machine is a non-woven fabric surface, the amount of paper dust generated during the processing process can be reduced, reducing the possibility of paper dust adhering to the contents. It is also excellent in hygiene.

  Furthermore, since the packaging material for sterilization is excellent in tensile strength, a larger tension can be applied in the processing step, and the slipperiness of the nonwoven fabric surface is good, so that it is excellent in mechanical suitability.

FIG. 1 is an external view conceptually showing an outline of sterilized paper according to the present invention. FIG. 2 is a schematic view showing the AA cross section in FIG. 1 showing sterilized paper in which a nonwoven fabric is laminated on one side of a sterilized paper substrate. FIG. 3 is a schematic view showing the AA cross section in FIG. 1 showing sterilized paper in which a nonwoven fabric is laminated on both surfaces of a sterilized paper base. FIG. 4 is an explanatory view showing an example of the manufacturing process of the sterilized paper of the present invention. FIG. 5 is an external view showing an outline of a wound body of sterilized paper obtained by printing on sterilized paper. FIG. 6 is a schematic external view showing sterilized paper obtained by cutting and winding the wound body of FIG. 5 at a cutting position. FIG. 7 is a schematic external view showing an example of the sterilization bag of the present invention. FIG. 8 is a schematic view showing a BB cross section in the sterilization bag of FIG. FIG. 9 is a schematic external view showing another example of the sterilization bag of the present invention. FIG. 10 is a schematic view showing a CC cross section of the sterilization bag of FIG. FIG. 11 is a schematic external view showing still another example of the sterilization bag of the present invention. 12 is a schematic view showing a DD cross section of the sterilization bag of FIG. FIG. 13 is a schematic external view showing a package body filled with contents from the opening using the sterilization bag shown in FIG. 11 and sealed by applying heat sealing to the opening. FIG. 14 is a schematic external view showing still another example of the sterilization bag of the present invention. 15 is a schematic view showing an EE cross section in the sterilization bag of FIG. FIG. 16 is a schematic cross-sectional view of a blister pack in which an opening of a container filled with contents using the sterilization lid of the present invention is sealed by heat sealing. FIG. 17 is a schematic plan view of a blister pack. FIG. 18 is a schematic plan view of a blister pack in which an opening of a container made of the sterilization packaging material of the present invention and filled with contents is sealed using the sterilization lid of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an external view conceptually showing an outline of sterilized paper according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 showing sterilized paper in which a nonwoven fabric is laminated on one side of a sterilized paper base material. FIG. 3 is a schematic view, FIG. 3 is a schematic view showing the AA cross section in FIG. 1 showing a sterilized paper in which a nonwoven fabric is laminated on both sides of a sterilized paper base, and FIG. 4 is a process for producing the sterilized paper of the present invention. FIG. 5 is an external view showing an outline of a sterilized paper winding body printed on sterilized paper, and FIG. 6 is a diagram illustrating the cutting of the winding body in FIG. 5 at a cutting position. FIG. 7 is a schematic external view showing a sterilized paper wound and wound, FIG. 7 is a schematic external view showing an example of the sterilization bag of the present invention, and FIG. 8 is a BB cross section of the sterilization bag of FIG. FIG. 9 is a schematic external view showing another example of the sterilization bag of the present invention, and FIG. 10 is a schematic view of C in the sterilization bag of FIG. FIG. 11 is a schematic external view showing still another example of the sterilization bag of the present invention, and FIG. 12 is a schematic view showing a DD cross section in the sterilization bag of FIG. FIG. 13 is a schematic external view showing a package that is filled with contents from the opening using the sterilization bag shown in FIG. 11 and sealed by applying heat sealing to the opening. FIG. 15 is a schematic external view showing still another example of the sterilization bag of the present invention, FIG. 15 is a schematic view showing an EE cross section of the sterilization bag of FIG. 14, and FIG. FIG. 17 is a schematic cross-sectional view of a blister pack in which an opening of a container filled with contents using a lid material is sealed by heat sealing, FIG. 17 is a schematic plan view of the blister pack, and FIG. An opening of a container filled with contents made of sterilization packaging material is provided in the present invention. It is a schematic plan view of a blister pack and sealed with sterile lid member.

  As shown in FIGS. 1 and 2, the sterilized paper 1 according to the present invention is a sterilized paper base 2 that is permeable to microorganisms but has gas permeability (breathability), and a number of linear shapes on the lower surface of the sterilized paper base 2. The nonwoven fabric 3 laminated | stacked through the thermoplastic resin 4 is provided.

  As shown in FIG. 3, the sterilized paper 1 is laminated with a sterilized paper base 2 that is permeable to microorganisms but has gas permeability, and a large number of linear thermoplastic resins 4 on the upper surface of the sterilized paper base 2. The non-woven fabric 3 may be provided, and the non-woven fabric 3 laminated on the lower surface of the sterilized paper substrate 2 with a large number of linear thermoplastic resins 4 interposed therebetween.

  As described above, the sterilized paper 1 includes the sterilized paper base 2 and the non-woven fabric 3 laminated on the sterilized paper base 2 with a large number of linear thermoplastic resins 4. It has sufficient gas permeability.

  Further, a sterilization packaging material 1 </ b> A is composed of the sterilized paper 1 having such a configuration and the synthetic resin base film 10. In this case, the peripheral edge 1a of the sterilized paper 1 and the peripheral edge 10a of the base film 10 are joined to form the heat seal portion 8 (see FIGS. 7, 8, 11, and 12).

  Further, the packaging material for sterilization 1A composed of the sterilized paper 1 and the base film 10 is bent into a cylindrical shape, and one end side is heat-sealed to form the heat-seal portion 8, thereby having a bag shape having a storage space inside. A sterilization bag 6 is constructed (see FIGS. 7 and 8).

  Further, the lid member 7 may be formed from the sterilized paper 1, and the lid member 7 may be attached to the opening 16 a of the container 16.

(Sterile paper base 2 based on paper)
Next, the sterilized paper 1 will be described in detail with reference to FIGS. As shown in FIGS. 1 to 3, the sterilized paper 1 has a paper-based sterilized paper base 2, which is a paper made of pulp dissolved in water. Although 100% pulp paper is used, thermoplastic resin fibers other than pulp may be mixed as needed. In addition, a sizing agent for bonding fibers and a water repellent agent for avoiding a change in pore size due to water absorption during steam sterilization or a decrease in physical strength may be mixed during papermaking.

Regarding the basis weight of the paper-based sterilized paper base material 2 used in the present invention, the bacteria impermeability cannot be expressed by basis weight, and there is no particular limitation, but generally 50 to 100 g / m ^2. Things are used. The smaller the basis weight, the more cost-effective, but if it is too small, microorganisms will permeate. On the other hand, if the basis weight is too large, the cost will be disadvantageous.

  The effects produced by the present invention are relative and not absolute, and are intended to broaden the range of sterilization conditions that can be performed over the prior art. For this reason, the gas permeability of the paper-based sterilized paper base material 2 used in the present invention cannot be specifically limited. Even a paper-based sterilized paper base material that peels off or has low air permeability can be used due to the reinforcing effect. The gas permeability of the sterilized paper base material 2 is preferably 10 seconds / 100 ml or more by JIS-P-8117 Gurley method, and more preferably 20 seconds / 100 ml or more.

(Linear thermoplastic resin 4)
Many linear thermoplastic resins 4 have a heat seal property that can be melted by heating and fused to the paper-based sterilized paper base material 2 and the non-woven fabric 3 having heat sealability. Any resin that can be melt extruded by an extruder or the like may be used. Examples of the thermoplastic resin 4 include polypropylene resin, low-density polyethylene resin, medium-density polyethylene resin, high-density polyethylene resin, linear low-density polyethylene resin, and ethylene / α-olefin polymerized using a metallocene catalyst. Polymer resin, ethylene / polypropylene copolymer resin, ethylene / vinyl acetate copolymer resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / methacrylic acid copolymer resin, ethylene -Graft polymerization of unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, ester monomer on methyl methacrylate copolymer resin, ethylene / maleic acid copolymer resin, ionomer resin, polyolefin resin, or , Copolymerized resin, maleic anhydride and polyolefin Fat in the graft-modified resin or the like by combining one or more may be used.

(Nonwoven fabric 3)
As the non-woven fabric 3, it is difficult to cause fiber debris, and a non-woven fabric in which fibers are bonded by a thermal bond method or a chemical bond method can be suitably used regardless of wet type, dry type, or direct type. The fiber length of the nonwoven fabric 3 may be either a short fiber or a long fiber. In particular, the thermal bond method of the long fiber is less likely to generate fiber debris at the cutting portion and less thread loss, so that it is more preferably used. Can do. However, since there is more paper dust generated from the paper-based sterilized paper base material 2 than fiber dust generated from the nonwoven fabric in general, as long as a thermal bond type or chemical bond type nonwoven fabric is used, the nonwoven fabric 3 Textile residue is not a problem. As a raw material of the fiber forming the nonwoven fabric 3, general polyethylene, polypropylene, polyethylene terephthalate, polyamide and the like can be used, and furthermore, fibers obtained by co-extrusion of these thermoplastic resins into a core-sheath structure can also be used. it can. For example, a thermal bond continuous fiber non-woven fabric (trade name: Elves) manufactured by Unitika Co., Ltd. using coextruded fibers having polyethylene terephthalate as a core and the periphery thereof coated with polyethylene can be used. Moreover, you may use the nonwoven fabric which joined the fiber of a different material as the nonwoven fabric 3. FIG.

In the case where the fiber surface constituting the nonwoven fabric 3 does not have heat sealability, a heat sealant is previously applied to the nonwoven fabric by a known coating method such as gravure coating or dip coating. In addition, the general nonwoven fabric 3 is joined by randomly entangled fibers, but is a nonwoven fabric in which thick fibers are regularly overlapped and joined in a mesh shape (for example, product name “Warif”, Nippon Oil Plastics) Etc.) can also be used. The basis weight of the nonwoven fabric 3 does not need to be particularly limited, and it is generally appropriate to use one having a basis weight of about 5 to 100 g / m ² depending on the required specifications. If the basis weight of the nonwoven fabric 3 is less than 5 g / m ² , the strength is insufficient. On the other hand, those exceeding 100 g / m ² can be used for sterilizing heavy items such as metal tanks and belt conveyors used in production lines, but are disadvantageous in terms of cost. Further, the air flow rate of the nonwoven fabric 3 only needs to be larger than the air flow rate of the sterilized paper base material 2. Generally, the air flow rate of the nonwoven fabric 3 is sufficiently larger than the air flow rate of the sterilized paper base material 2. Any gas permeability that is equal to or higher than the gas permeability of the base sterilized paper substrate 2 may be used. For example, a nonwoven fabric-based sterilized paper having a gas permeability comparable to or higher than the gas permeability of the paper-based sterilized paper substrate 2 to be used can be used as the nonwoven fabric according to the present invention.

  Moreover, when laminating the nonwoven fabric 3 on both surfaces of the paper-based sterilized paper base material 2 (see FIG. 3), the nonwoven fabric 3 having the same both surfaces may be used, or different nonwoven fabrics 3 may be used on each side.

  When the above-described sterilization packaging material 1A is used for steam sterilization, the nonwoven fabric 3 having a fiber surface material of polyethylene resin is insufficient in heat resistance and cannot be used. On the other hand, for steam sterilization, a polypropylene heat sealant was applied to a nonwoven fabric 3 made of polypropylene resin and a nonwoven fabric 3 made of a resin capable of withstanding steam heating at 121 ° C., such as a polyethylene terephthalate fiber surface material. The nonwoven fabric 3 or the nonwoven fabric 3 having a core-sheath structure and a fiber surface material of polypropylene resin can be used.

  As shown in FIG. 2, printing 11 such as letters, designs, and barcodes can be performed on the sterilized paper base 2 of the sterilized paper 1. The printing method may be a known technique, but since the surface of the sterilized paper base 2 serving as the printing surface is rough compared to a film or printing paper, it is particularly preferable to use gravure printing, letterpress printing, or flexographic printing. it can.

  The linear thermoplastic resin 4 is formed by being extruded linearly, and the width and interval of one thermoplastic resin 4 vary depending on the air permeability and physical strength required for the sterilization packaging material 1A. When the width of the thermoplastic resin 4 is narrow and the interval between the thermoplastic resins 4 is large, the gas permeability of the sterilized paper 1 is hardly decreased, which is preferable. However, in this case, if the width of the thermoplastic resin 4 is too narrow and the distance between the thermoplastic resins 4 is too wide, the adhesive strength between the sterilized paper base 2 and the nonwoven fabric 3 is lowered, and therefore the thermoplastic resin 4 The width is 0.5 mm to 3 mm, preferably 0.5 mm to 2 mm. Further, the interval between the thermoplastic resins 4 extruded linearly, that is, the exposed distance of the sterilized paper base 2 is 0.3 mm to 10 mm, preferably 0.5 mm to 8 mm.

  The coverage of the surface of the sterilized paper base 2 with the thermoplastic resin 4 extruded in a straight line directly affects the gas permeability (gas permeability) of the sterilized paper according to the present invention. That is, the gas permeability (gas permeability) of the sterilized paper 1 is reduced in proportion to the coverage of the thermoplastic resin 4, but the sterilized paper 1 and the sterilization packaging are high even if the coverage is high and the gas permeability is reduced. In some cases, the physical strength of the material 1A may be emphasized, and the coverage cannot be generally defined. In other words, the coverage of the thermoplastic resin 4 is generally about 80% to 10%, preferably about 60% to 30%.

  As described above, FIG. 3 shows the sterilized paper 1 having the sterilized paper base 2 and the nonwoven fabric 3 laminated on both surfaces of the sterilized paper base 2. If it is necessary to print on the nonwoven fabric 3, it is better to use the nonwoven fabric 3 with the highest surface smoothness as possible on the printing surface, and even when printing on the paper-based sterilized paper substrate 2, a highly transparent nonwoven fabric is laminated. Then, it is possible to confirm the print contents from the outside. The laminate of the nonwoven fabric 3 on both sides of the paper-based sterilized paper base 2 not only improves the physical strength but also the sterilization packaging material 1A than the laminate of the nonwoven fabric 3 only on one side of the sterilized paper base 2. When heat-sealing, a strong heat-sealing strength can be obtained on both sides, which is convenient. In addition, when the nonwoven fabric 3 is laminated | stacked on both surfaces of the paper-based sterilized paper base material 2, the thermoplastic resin 4 extruded in many straight lines in parallel on both sides of the sterilized paper base material 2 exists. For this reason, if the coverage of the thermoplastic resin 4 on both sides of the sterilized paper base 2 is high, the gas permeability of the sterilized paper 1 and the sterilization packaging material 1A is significantly reduced. The coverage of the thermoplastic resin 4 on the surface of the material 2 may be lowered.

  Next, the manufacturing process of the sterilized paper 1 will be described with reference to FIG.

  Here, FIG. 4 is explanatory drawing which shows an example of the extrusion laminator for manufacturing the sterilized paper of this invention. In the extrusion laminator shown in FIG. 4, the resin melted by an extruder (not shown) is sent to the die 101. The molten resin 4 is continuously extruded in a rod shape between the paper-based sterilized paper base material 2 on the cooling roll 102 and the non-woven fabric 3 on the pressing roll 103 from a large number of nozzles 101 a provided in the width direction at the tip of the die 101. It is. As a result, the sterilized paper base material 2 and the nonwoven fabric 3 are laminated via the thermoplastic resin 4 melted and extruded linearly in parallel.

  When the non-woven fabric 3 is laminated on both surfaces of the paper-based sterilized paper base material 2, the non-woven fabric 3 is again laminated on the paper-based sterilized paper base material 2 in the same manner. Or if the tandem extrusion laminator which has the two dice | dies 101 is used, the nonwoven fabric 3 can be laminated | stacked on both surfaces of the paper-based sterilization paper base material 2 at once. When a tandem extrusion laminator is used, the order in which the paper-based sterilized paper base material 2 and the nonwoven fabric 3 are supplied differs depending on whether or not the tandem extrusion laminator reversing device is provided.

  Further, when producing the sterilized paper 1 of the present invention, the paper-based sterilized paper base 2 or the nonwoven fabric 3 may be subjected to corona discharge treatment or ozone treatment with high-concentration ozone gas as necessary.

  Moreover, an anchor coat agent may be applied to the paper-based sterilized paper base 2 and the nonwoven fabric 3 as necessary. When applying the anchor coating agent to the sterilized paper base material 2, the gas permeability of the sterilized paper base material 2 may be lowered, and therefore management of the gas permeability is important.

  In addition, without using the extrusion laminator 100, it is also possible to use a method in which a large number of hot melt applicators are arranged and laminated while the thermoplastic resin is continuously poured out.

  By the way, once the thermoplastic resin 4 is melt-extruded in a straight line in parallel on the paper-based sterilized paper base material 2, the nonwoven fabric 3 may be overlapped and passed through a hot roll to be heat-laminated. The extrusion laminator 100 takes time to start up, it is difficult to process a narrow film, and there is a lot of loss of the thermoplastic resin 4. For this reason, when an expensive thermoplastic resin 4 is used or when a small amount is produced, the thermoplastic resin 4 is melt-extruded in a straight line in parallel to a paper-based sterilized paper base 2 in advance, and a separate process is performed. It is convenient to heat laminate.

  FIG. 5 is an external view schematically showing a wound body of the sterilized paper 1 printed on the sterilized paper 1. FIG. 6 is an external view showing an outline of the sterilized paper 1 obtained by cutting and winding the wound body at the cutting position.

  When the sterilized paper 1 according to the present invention is used as the lid member 7, only the cutting positions at both ends of the winding body in FIG. 5 are cut and set in a packaging machine as a single-row or multi-row winding, and the container 16 opening 16 a After the container 16 is sealed by heat sealing, horizontal cutting and vertical cutting can be performed. Moreover, when using the sterilized paper 1 on one side of the sterilization bag 6 or a part of one side, the rolls of 2-3 rows are set in the bag making machine and used. Further, the sterilized paper 1 is cut into a strip of several tens mm width, and is attached to a part of the sterilization bag 6 by heat sealing continuously in the vertical direction, or pulled out in a circle and attached to a part of the sterilization bag 6 by heat sealing. Can be.

  As shown in FIG. 7, the sterilized paper 1 of the present invention cut into a circle is applied to a part of a bag 6 made of a base film 10 in a circular shape, and a heat seal 8 is formed by heat sealing. The sterilization packaging material 1A may be configured, and the sterilization bag 6 having the opening 15 may be produced from the sterilization packaging material 1A. FIG. 8 is a diagram showing an outline of a cross section of the heat seal portion of FIG. 7B-B.

  9 is an external view showing a sterilization bag 6 made of sterilization packaging material 1A including one side made of base film 10 and the other side made of sterilized paper 1. FIG. 10 is a cross-sectional view of FIG. 9C-C. FIG. In FIG. 9, an easy peel sealant is used on the heat seal surface on the base film 10 side, and one side of the side seal is formed into a "<"-shaped seal shape, thereby forming a peeling opening and easily opening by hand. A sterilization bag 6 can be produced.

  As shown in FIG. 11, a bag is formed from a base film 10 rolled into a “C” shape, and the sterilized paper 1 of the present invention cut into a belt-like shape at the back seal portion of the bag is heat-sealed. The heat seal part 8 is formed. In this way, the sterilization bag 6 having the opening 15 made of the sterilization packaging material 1 </ b> A having the base film 10 and the sterilized paper 1 is produced. FIG. 12 is a diagram schematically showing the cross section of FIGS. 11D-D. When the contents 9 are packaged in the sterilization bag 6 illustrated here and the package 9 in which the opening 15 is sealed by heat sealing is subjected to gas sterilization, the bag is most easily broken in parallel with both ends of the sterilized paper 1. It is the heat seal part 8 which was made. In addition, the heat seal portion 8b that intersects the top and bottom seal portion 8a and the sterilized paper 1 also easily breaks the bag. In this case, the sterilized paper 1 in which the nonwoven fabric 3 having heat sealability is laminated on both surfaces of the sterilized paper base 2 may be used, and when the heat seal strength is not so high, such as a low pressure reduction rate during the sterilization operation. Does not have to laminate the nonwoven fabric 3 on the content side of the sterilized paper base 2.

  Here, when the sterilization packaging material 1A of the present invention is heat-sealed, the vertical seal can be reliably sealed if the heat-sealing width is set to be equal to or greater than the interval of the thermoplastic resin 4 extruded in a straight line. Even if the covering ratio of the thermoplastic resin 4 is low, the horizontal seal is crushed and spread laterally by the thermoplastic resin 4 sandwiched between the seal bars, and the nonwoven fabric 3 having heat sealability is also sandwiched between the seal bars. Since it is heat-sealed to the sterilized paper substrate 2, it can be sealed without problems.

  FIG. 13 is a schematic plan view showing the sterilized package 9 in which the contents M are stored in the sterilization bag 6 shown in FIG. 11, the opening 15 is sealed by heat sealing, and gas sterilization is performed.

  Further, as shown in FIG. 14, the base film 10 is folded in half, and the pores 17 are continuously provided in the vertical direction in the vicinity of the overlapped vertical ends. After covering the pores 17 with the sterilized paper 1 of the present invention cut into a strip shape, both ends of the sterilized paper 1 are continuously heat-sealed in the vertical direction, and then the peripheral edge of the base film 10 leaving the opening 15 Heat seal the part. In this way, the sterilization bag 6 is obtained.

  Although the pores 17 are provided by perforations, the pores 17 may be formed by other means such as punching with a hot needle or punch holes.

  When the sterilized paper 1 is heat-sealed along the peripheral edge of the bag-like sterilized packaging material 1A in this way, it is the vertical seal provided on the peripheral edge that requires stronger heat seal strength. For this reason, when the sterilized paper 1 is the one in which the nonwoven fabric 3 is laminated only on one side of the sterilized paper base 2, the heat seal strength with the opposing base film 10 is further strengthened by arranging the nonwoven fabric 3 side on the inside. Can be. When the sterilized paper 1 cut into a strip shape has the nonwoven fabric 3 on both surfaces of the sterilized paper substrate 2, the surface of the nonwoven fabric 3 that provides a stronger heat seal strength with the base film 10 is disposed on the inner side. FIG. 15 is a schematic view of the cross section of FIGS. 14E-E, in which the non-woven fabric 3 is laminated only on one side of the sterilized paper base 2 and the surface of the non-woven fabric 3 side of the sterilized paper 1 cut into a strip shape faces inward.

  The above illustration is an example of the sterilization bag 6 having the sterilized paper 1 and the base film 10 according to the present invention, and the present invention is not limited thereby.

  For example, the sterilization bag 6 may be a four-side seal type, a side seal type, a two-side seal type, a three-side seal type, an envelope-attached seal type, or a central palm-seal type in addition to the tape-attached bag. Peel type (pillow seal type), back-stick tape type, pleated seal type, flat bottom seal type, gusset bag type, single gusset bag type, standing pouch type, tube bag type, or square bottom The bag may be any seal shape such as a seal shape. Alternatively, the base film 10 may be hollowed out, or the sterilized paper 1 may be applied to the perforated portion, or a four-sided seal type, a standing pouch type, or a gusset bag type with a pillar seal, etc. If the bag body has two or more surfaces surrounded by the heat seal portion, the sterilized paper 1 can be used on at least one surface, and a bag having a folded portion such as a gusset bag shape or a standing pouch shape. The sterilized paper 1 can be used for the folding part of the body.

  Further, instead of the sterilization bag 6, a sterilization container may be produced using a sterilization packaging material 1 </ b> A having the sterilized paper 1 and the base film 10.

  FIG. 16 is a schematic cross-sectional view of a blister pack using the sterilization lid of the present invention, and FIG. 17 is a schematic plan view. The sterilization lid 7 is made of the sterilized paper 1 having the above-described structure, and is used as a heat-sealable lid for the molded container 16 to form the package 9 by filling the molded container 16 with the contents M. it can. Furthermore, if an easy peel sealant for the sterilization lid 7 is used as the heat-sealable layer of the molded container 16, it is preferable because easy-openability can be imparted.

  As shown in FIG. 18, the blister pack is obtained by sealing the opening 16a of the molded container 16 filled with the contents M by heat sealing using the sterilization lid 7 partially using the sterilized paper 1. It is done.

  The molding container 16 can be produced by any molding method such as injection molding, sheet molding, blow molding, and the like, and the lid material 7 is heat sealed using a resin having heat sealing properties. Thus, the container 16 can be sealed.

  Next, the present invention will be described in more detail with reference to examples and comparative examples.

(Manufacture of sterilized paper 1)
As the paper-based sterilized paper base ^2, a sterilized paper base (product name “TAP70”, manufactured by Tokushu Paper Co., Ltd.) having a basis weight of 70 g / m ² was used. Using a polyethylene resin (product name “LC604”, manufactured by Nippon Polyethylene Co., Ltd.) as a thermoplastic resin on one side, a large number of straight lines having a thickness of 50 μm and a width of 1 mm from a large number of nozzles of a T die. A spunbonded non-woven fabric (product name “Product name”) is formed by extruding a linear thermoplastic resin 4 in parallel at intervals of 2.3 mm and simultaneously forming linear thermoplastic resin 4 on a linear thermoplastic resin 4 and having a basis weight of 20 g / m ^2. "Elves S0203WDO", manufactured by Unitika Ltd.) was bonded. In this manner, the sterilized paper 1 of the present invention having a layer structure of sterilized paper base material 2 (70 g / m ² ) / linear polyethylene 4 / spunbond nonwoven fabric 3 (20 g) and a width of 580 mm was produced.

  Thereafter, the sterilized paper 1 was slit and wound up to a width of 30 mm to produce a wound body of the sterilized paper 1.

  In addition, the used spunbond nonwoven fabric 3 has a core-sheath structure in which a core made of polyethylene terephthalate is covered with polyethylene, and is composed of a spunbond-type thermal bond long fiber nonwoven fabric.

(Manufacture of base film 10)
After printing on the back of a 12 μm thick biaxially stretched polyethylene terephthalate film, the printed biaxially stretched polyethylene terephthalate film with a thickness of 12 μm, a biaxially stretched polyamide film with a thickness of 15 μm, and a heat seal layer are sequentially formed from the outside. A 60 μm linear low-density polyethylene film was laminated via an adhesive (two-component curable urethane-based adhesive layer), then cut and wound. Thus, a base film 10 having a width of 220 mm having a layer structure of biaxially stretched polyethylene terephthalate film (12 μm) / adhesive layer / biaxially stretched polyamide film (15 μm) / adhesive layer / unstretched polyethylene film (60 μm). Manufactured.

(Manufacture of sterilization bag 6)
The sterilized paper 1 and the base film 10 obtained above were put on a center press seal type bag making machine. Next, the both ends of the base film 10 with the heat seal surface facing inward and folded in a “C” shape are superimposed on 5 mm of both ends of the nonwoven fabric 3 having heat sealability of the sterilized paper 1 having a width of 30 mm. A parallel vertical seal with a width of 5 mm was applied so that the inner distance was 20 mm, and a horizontal seal with a width of 10 mm was applied at intervals of 250 mm. Next, the notch 14 was put in the position of 15 mm from the bending end of the base film 10, and it cut in the horizontal direction vicinity in the horizontal direction. In this way, a sterilization bag 6 made of a back-attached tape-shaped bag body having a width of 120 mm, a length of 250 mm, and an exposed width of 20 mm of the sterilized paper 1 was produced.

(Manufacture of sterilized bag 9)
As the contents, five sheets of 300 mm × 300 mm gauze folded into 150 mm × 100 mm were stored in the sterilization bag 6, and the opening 15 was sealed by heat sealing with a width of 5 mm to produce 100 packaging bodies 9.

  The package 9 obtained above is sterilized under sterilization conditions, temperature 40 ° C., relative humidity 40%, pressure 0.1 MPa, sterilization time 6 hours, and then vacuum dried at 80 ° C. for 2 hours. As a result, a sterilized package 9 was obtained.

  As a result of observing the parallel heat-sealed portion 8 between the packaging material 1 for gas sterilization and the base film 10 and the top-and-bottom heat-sealed portion 8a, the sterilized package 9 is opened from the notch 14 portion to remove the contents. Alternatively, there was no paper peeling, and no appearance defects such as biting of the heat seal portion 8 were observed. Further, when the package 9 was opened from the notch 14, even if the tear line of the base film 10 reached the sterilized paper 1, the sterilized paper 1 was not cut, and at least no visible paper dust was generated.

[Comparative Example 1]
All examples except that instead of the sterilized paper 1 of Example 1, a sterilized paper base (product name “TAP70”, manufactured by Tokushu Paper Co., Ltd.) having a basis weight of 70 g / m ² was slit to a width of 30 mm. A sterilization bag of a comparative example was manufactured using the same base film, process, dimensions, and form as in Example 1.

  Thereafter, the same contents as in Example 1 were packaged, EOG sterilization was performed together with the EOG sterilization performed in Example 1, and 100 sterilized packaging bodies of Comparative Examples were produced.

  The above sterilized package is cut from the notch to remove the contents, and as a result of observing the parallel heat seal part of the sterilized paper and the base film and the top and bottom heat seal part, the parallel seal part inside the bag body near the center. There were two bags in which the seal part peeled off with a width of about 1 mm at the seal edge of the sterilized paper.

  Further, when the package body was cut open from the notch, the tear line of the base film reached the sterilized paper, and one bag body in which the sterilized paper was cut and three bag bodies in which the seal part was peeled were generated.

(Manufacture of sterilized paper 1)
As the paper-based sterilized paper base ^2, a sterilized paper base (product name “MEP-70P”, manufactured by Kojin Co., Ltd.) having a basis weight of 70 g / m ² was used. The surface of characters and designs is printed on one side, and a polypropylene resin (product name “FL02A”, manufactured by Nippon Polypro Co., Ltd.) is used as the thermoplastic resin on the non-printed side of the sterilized paper. A large number of linear thermoplastic resins 4 having a thickness of 40 μm and a width of 1.2 mm are linearly extruded from the nozzle in parallel at intervals of 3.2 mm, and at the same time, the linear thermoplastic resin 4 is formed on the linear thermoplastic resin 4. A 25 g / m ² polypropylene fiber spunbond thermal bond non-woven fabric (product name “PS-105”, manufactured by Mitsui Chemicals, Inc.) was bonded. In this way, the sterilized paper 1 of the present invention having a layer structure of sterilized paper base material 2 (70 g / m ² ) / linear polypropylene 4 / spunbond nonwoven fabric 3 (25 g) and having a width of 600 mm was produced. Thereafter, the sterilized paper 1 was cut and wound up to produce a wound body of the sterilized paper 1 having a width of 580 mm.

(Manufacture of base film 10)
In order from the outside, a biaxially stretched polyethylene terephthalate film with a thickness of 12 μm, a biaxially stretched polyamide film with a thickness of 15 μm, and an easy peel sealant for a polypropylene film with a thickness of 50 μm as a heat seal layer are bonded to an adhesive (two-component curable urethane system After laminating via the adhesive layer), it was cut and wound up. In this way, a base film 10 having a width of 580 mm having a layer structure of biaxially stretched polyethylene terephthalate film (12 μm) / adhesive layer / biaxially stretched polyamide film (15 μm) / adhesive layer / easy peel sealant (50 μm). Manufactured.

(Manufacture of sterilization bag 6)
Using the two-axis supply type three-side seal type bag making machine, the base film 10 is set on the upper shaft and the sterile paper 1 is set on the lower shaft to carry out side-by-side bag making. did. At this time, one surface is made of the base film 10 and the other surface is made of the sterilized paper 1, and the surface of the non-woven fabric 3 having heat sealability of the sterilized paper 1 and the easy peel sealant surface of the base film 10 are heat sealed. A three-side sealed sterilization bag 6 having a length of 280 mm, a side seal width of 10 mm, and a bottom seal width of 10 mm was manufactured. The bottom seal was shifted 20 mm from the normal position toward the opening 15 to provide a 20 mm × 120 mm unsealed portion outside the bottom seal, which was used as a peeling opening when the package was manually opened.

(Manufacture of sterilized bag 9)
As the contents, five sheets of 300 mm × 300 mm gauze folded into 150 mm × 100 mm were stored in the sterilization bag 6, and the opening 15 was sealed by heat sealing with a width of 5 mm to produce 100 packaging bodies 9.

  The package 9 obtained above was sterilized under sterilization conditions, a temperature of 121 ° C. and a sterilization time of 30 minutes, and then steam sterilized by drying at 100 ° C. for 1 hour to obtain a sterilized package 9.

  As a result of the appearance inspection of the heat seal portion 8 of the sterilized package 9, no appearance defects of the seal portion such as paper peeling, peeling, and tearing occurred.

  In addition, a clean peel surface free from fuzz, paper dust residue, and fiber residue was obtained on the heat seal portion peel surface opened by hand from the peeling opening.

[Comparative Example 2]
Example 2 except that a sterilized paper base (product name “MEP-70P”, manufactured by Kojin Co., Ltd.) having a width of 580 mm and a basis weight of 70 g / m ² was used in place of the sterilized paper 1 of Example 2. A sterilization bag of a comparative example was manufactured using the same base film, process, dimensions, and form. As a result of observing the inner surface of the bag body from the base film side of the bag body, a large number of bag bodies having fine paper powder adhered to the inner surface, which were not recognized in Example 2, were found.

  Thereafter, the same contents as in Example 2 were packaged and steam sterilized together with the steam sterilization performed in Example 2 to produce 100 sterilized packaging bodies of Comparative Examples.

  As a result of carrying out the appearance inspection of the heat-sealed portion 8 of the sterilized package of the comparative example, no appearance of the seal portion such as paper peeling, peeling, and tearing occurred, but the sterilized package of the comparative example was peeled off. As a result of observing the heat seal part of the base film after peeling from the mouth by hand, adhesion of paper powder was observed in all the bags.

(Manufacture of sterilized paper 1)
As the paper-based sterilized paper base ² , sterilized paper (product name “TAP70”, manufactured by Tokushu Paper Industries Co., Ltd.) having a basis weight of 70 g / m ² was used. Using a polyethylene resin (product name “LC604”, manufactured by Nippon Polyethylene Co., Ltd.) as a thermoplastic resin on one side, a large number of straight lines having a thickness of 50 μm and a width of 1 mm from a large number of nozzles of a T die. A linear non-woven fabric (product name “Warif LX24”, Shinichi) is formed by extruding linear thermoplastic resin 4 in parallel at intervals of 3.2 mm and simultaneously forming linear thermoplastic resin 4 on linear thermoplastic resin 4 with a basis weight of 38 g / m ^2. Stone Plast Co., Ltd.) was pasted together. Similarly, on the other surface of the sterilized paper base 2, a large number of linear thermoplastic resins 4 having a thickness of 50 μm and a width of 1 mm are linearly extruded in parallel at intervals of 3.2 mm. At the same time, a spunbonded nonwoven fabric (product name “Elves S0303WDO”, manufactured by Unitika Co., Ltd.) having heat sealing properties with a basis weight of 30 g / m ² was bonded onto the linear thermoplastic resin 4. Thus, a spunbond nonwoven fabric 3 (30 g) / linear polyethylene 4 / sterile paper base material 2 (70 g / m ² ) / linear polyethylene 4 / mesh nonwoven fabric 3 (38 g) having a layer structure of 500 mm in width. Sterile paper 1 was produced. The sterilized paper 1 was cut and wound to produce a wound body of sterilized paper 1 having a width of 480 mm.

(Manufacture of base film 10)
In order from the outside, a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm, a biaxially stretched polyamide film having a thickness of 15 μm, and a linear low density polyethylene film having a thickness of 80 μm as a heat seal layer are bonded to an adhesive (two-component curable urethane). After being laminated via a system adhesive layer), it was cut and wound up. Thus, a base having a width of 580 mm having a layer structure of biaxially stretched polyethylene terephthalate film (12 μm) / adhesive layer / biaxial stretched polyamide film (15 μm) / adhesive layer / linear low density polyethylene film (80 μm) Film 10 was produced.

(Manufacture of sterilization bag 6)
The sterilized paper 1 and the base film 10 obtained above are vertically collected using a four-axis supply type three-side seal type bag making machine with the base film 10 on the vertical axis and the packaging material 1 for gas sterilization on the left and right axes. Bag making was carried out. At this time, a sterilization bag 6 was obtained in which the front and rear surfaces were made of the base film 10 and the both folded portions were made of sterilized paper 1. The folding portion of the sterilization bag 6 has a mesh-like heat sealability of the sterilized paper 1, and the surface of the nonwoven fabric 3 of the sterilized paper 1 and the surface of the linear low density polyethylene film of the base film 10 are heat sealed. The sterilization bag 6 has an opening 15 and a notch 14 at the center of the bottom seal portion, and has a four-pillar seal gusset bag shape having a width of 570 mm, a length of 800 mm, a folding portion width of 230 mm, a side seal width of 10 mm, and a bottom seal width of 10 mm. A sterilization bag 6 is provided. Since the outer surface of the folded portion is made of the surface of the nonwoven fabric 3 having heat sealing properties, the outer surfaces of the folded portion of the bottom seal portion are heat sealed, and the folded portion of the bottom seal portion does not open even if the contents are stored. Not only was the top clean, but the strength of the bottom of the bag body was improved, which was convenient.

(Manufacture of sterilized bag 9)
A package 9 in which a stainless steel pressure vessel (manufactured by SUS306, diameter 220 mm, height 480 mm, weight 12 Kg) having a capacity of 10 liters was stored as the contents and the opening 15 was sealed by heat sealing with a width of 5 mm was manufactured.

  The package 9 obtained above is sterilized under sterilization conditions, temperature 40 ° C., relative humidity 40%, pressure 0.1 MPa, sterilization time 6 hours, and then vacuum dried at 80 ° C. for 2 hours. As a result, a sterilized package 9 was obtained.

  Even if the upper part of the sterilized package 9 is grasped and lifted by hand, the bag is not damaged. Further, the contents were removed by opening from the notch 14 part, and as a result of observing the parallel seal part 8 of the gas sterilization packaging material 1 and the base film 10 and the top and bottom heat seal part 8a, there was no bag breakage or paper peeling. Appearance defects such as biting of the heat seal portion 8 were not recognized at all. Further, when the package 9 was opened from the notch 14, even if the tear line of the base film 10 reached the sterilized paper 1, the sterilized paper 1 was not cut, and therefore at least visible paper dust was not generated.

[Comparative Example 3]
The same as Example 3 except that instead of the sterilized paper 1 of Example 3, a 480 mm wide sterilized paper base material having a basis weight of 90 g / m ² (product name “TAP90”, manufactured by Tokushu Paper Co., Ltd.) was used. A gas sterilization bag of a comparative example was manufactured according to the base film, process, dimensions, and form. As a result of observing the inner surface of the sterilization bag through the base film, a large number of bags having fine paper powder adhered to the inner surface, which were not recognized in Example 3, were found.

  Thereafter, the same contents as in Example 3 were packaged in a sterilization bag and steam sterilized under the same conditions as in Example 3 to obtain a sterilized package of a comparative example.

  When the upper part of the bag of the sterilized package was grasped by hand and lifted, the paper was peeled off at the heat seal part of the sterilized paper folded into the base film and the base film, and the bag was broken.

(Manufacture of sterilization lid 7)
The sterilized paper 1 having the same configuration as that of Example 2 except for the printing contents was manufactured, and then slit and wound up to a width of 423 mm to manufacture a sterilization lid 7.

(Manufacture of blister packs)
A prefilled syringe dummy was prepared by filling 40 ml of water into a polypropylene syringe having a nominal capacity of 50 ml as the contents and capping the tip.

  A 600 μm thick polypropylene sheet (product name “Pure Thermo”, manufactured by Idemitsu Unitech Co., Ltd.) is set in a plug-assist vacuum / pneumatic molding and filling machine (multi-back R530, manufactured by multi-back) and matched to the shape of the dummy. The container was molded. Thereafter, the dummy is housed in the molded part, and the surface of the nonwoven fabric 3 having heat sealability of the sterilization lid 7 and the flange of the opening 16a of the container 16 are sealed by heat sealing, and are shown in FIGS. 50 blister packs were made.

  In addition, the heat seal surface has the easy peel property with respect to a polypropylene film among the polypropylene sheets used by the present Example.

  The blister pack was sterilized under sterilization conditions, a temperature of 121 ° C. and a sterilization time of 20 minutes, and then steam sterilized by drying at 80 ° C. for 30 minutes to obtain a sterilized package 9.

  As a result of the appearance inspection of the heat seal portion 8 of the sterilized package 9, no appearance defects of the seal portion such as paper peeling, peeling, and tearing occurred. Moreover, as a result of peeling off the cover material by hand and observing the peeled surfaces of both the molded container 13 and the cover material, there was no appearance defect such as paper peeling and fiber dropping.

[Comparative Example 4]
Instead of the gas sterilization lid 7 of Example 4, a sterilized paper base (product name “MEP-70P”, manufactured by Kojin Co., Ltd.) having a width of 423 mm and a basis weight of 70 g / m ² was used as a gas sterilization of a comparative example. The blister pack of the comparative example was manufactured by using the same polypropylene sheet, molded container, syringe, contents, and filling amount as in Example 4 except that the lid was used as a cover material, and steam sterilization together with the steam sterilization performed in Example 4 As a result, 50 sterilized packaging bodies of comparative examples were produced.

  As a result of carrying out the appearance inspection of the heat seal part of the sterilized package of the above comparative example, the seal part appearance defects such as paper peeling, peeling, and tearing did not occur, but the cover material was peeled off by hand, and molding after peeling As a result of observing the heat seal part of the container flange, adhesion of paper dust was recognized in all the molded containers. When the lid was peeled off, the sterilized paper was torn, the paper powder was scattered, and three pieces of sterilized paper left on the flange of the molded container were generated.

[Measurement of heat seal strength]
Using the sterilized paper 1 and the base film 10 manufactured in Example 1, (1) the surface of the non-woven fabric 3 having heat sealability of the sterilized paper 1 and (2) the surface of the sterilized paper base 2 of the sterilized paper 1 On the other hand, the heat seal surface of the base film 10 was heat sealed. At this time, in both cases (1) and (2), heat sealing was performed by applying a hot plate from the base film 10 side under heat sealing conditions of 160 ° C., 0.1 MPa, 2.0 seconds, and a heat sealing width of 10 mm.

Using the sterilized paper 1 and the base film 10 manufactured in Example 2, (3) the surface of the non-woven fabric 3 having heat sealability of the sterilized paper 1, and (4) the surface of the sterilized paper base 2 of the sterilized paper 1 On the other hand, the heat seal surface of the base film 10 was heat sealed. At this time, in both cases (3) and (4), heat sealing was performed by applying a hot plate from the base film 10 side under heat sealing conditions of 180 ° C., 0.1 MPa, 2.0 seconds, and a heat sealing width of 10 mm. The heat seal strength in the cases (1) to (4) at this time was measured. The results are shown in the following table.

  As shown in the table, the sterilized paper according to the present invention is superior in having a strong heat seal strength that was not obtained with conventional paper-based sterilized paper.

DESCRIPTION OF SYMBOLS 1 Sterilization paper 1A Sterilization packaging material 2 Paper-based sterilization paper base material 3 Non-woven fabric having heat sealability 4 Thermoplastic resin 6 Sterilization bag 7 Sterilization cover material 8 Heat seal part 9 Sterilized package 10 Base film 11 Printing Layer 14 Notch 15 Opening 16 Molding container 16a Opening M Contents

Claims (8)

A sterile paper substrate that is permeable to microorganisms but gas permeable,
A sterilized paper comprising a non-woven fabric laminated with a large number of linear thermoplastic resins on at least one surface of a sterilized paper substrate.   2. The sterilized paper according to claim 1, wherein the non-woven fabric is laminated on both surfaces of the sterilized paper base via a large number of linear thermoplastic resins.   2. The sterilized paper according to claim 1, wherein the nonwoven fabric is made of a material having heat sealability.   4. The sterilized paper according to claim 3, wherein the nonwoven fabric has a polypropylene layer on the surface of the thermoplastic resin, and each linear thermoplastic resin comprises a melt-extruded polypropylene resin that is welded to the polypropylene layer of the nonwoven fabric. The sterilized paper according to claim 1,
With a synthetic resin base film,
A sterilization packaging material, wherein a peripheral edge of sterilized paper and a peripheral edge of a base film are joined by heat sealing. The sterilized paper according to claim 1,
With a synthetic resin base film,
A sterilization bag characterized in that a peripheral edge portion of a sterilized paper and a peripheral edge portion of a base film are joined by heat sealing and has a storage space therein. The sterilized paper according to claim 1,
With a synthetic resin base film,
A sterilization container characterized in that a peripheral edge of a sterilized paper and a peripheral edge of a base film are joined by heat sealing and has a storage space inside. The lid member made of sterilized paper according to claim 1,
A lid for sterilization, wherein the lid is attached to an opening provided in a container made of a synthetic resin that forms a storage space inside.

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