Nonwoven sheets, sterile packaging materials, and sterile lid materials

Abstract

[Problem] When opening sterilization packaging materials, the fibers of the nonwoven sheet are not exposed to the outside. [Solution] The nonwoven sheet 10 has a nonwoven sheet body 11, a sealing layer 12 that partially penetrates into the nonwoven sheet body 11, and a heat-seal layer 13 provided on the sealing layer 12. The nonwoven sheet 10 is breathable.

Description

[Technical Field]

[0001] The present invention relates to a nonwoven sheet, a sterilization packaging material, and a sterilization lid material. [Background technology]

[0002] Conventionally, sterile packaging materials that house medical instruments while being breathable, or breathable sterile lids that can be attached to containers for storing medical instruments, are known. Such sterile packaging materials or sterile lids are made of nonwoven fabric, and this nonwoven fabric is heat-sealed to a mating material, such as a synthetic resin film substrate or a synthetic resin container.

[0003] Medical instruments are stored in sterile packaging materials or in containers made of synthetic resin. After the medical instruments have been sterilized, when using them, the sterile packaging materials are opened or the sterile lid is removed from the container.

[0004] However, when opening sterilization packaging materials or peeling sterilization lids from containers, some nonwoven fabric fibers may remain on the other material and become exposed.

[0005] If some fibers of the nonwoven fabric remain on the other material and are exposed to the outside, these fibers could potentially become foreign objects in medical devices. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2007-1584 [Patent Document 2] Japanese Patent Publication No. 2007-331781 [Patent Document 3] Japanese Patent Publication No. 2011-245734 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] This disclosure has been made with these points in mind, and aims to provide a nonwoven sheet, a sterile packaging material, and a sterile lid material that prevent fibers from being exposed to the outside and contaminating medical devices as foreign matter when opening sterile packaging materials or peeling sterile lid materials from containers. [Means for solving the problem]

[0008] A first embodiment of the present disclosure is a nonwoven sheet that is breathable, comprising a nonwoven sheet body, a sealing layer provided on the nonwoven sheet body and partially penetrating into the nonwoven sheet body, and a heat-seal layer provided on the sealing layer.

[0009] A second embodiment of the present disclosure is a nonwoven sheet in which the sealing layer contains a styrene-acrylic resin, in the first embodiment.

[0010] A third embodiment of the present disclosure is a nonwoven sheet in which the heat seal layer comprises a polyolefin resin, in either the first or second embodiment.

[0011] A fourth embodiment of the present disclosure is a nonwoven sheet in any of the first to third embodiments, wherein the nonwoven sheet body comprises a high-density polyethylene spunbond nonwoven fabric, sterile paper, kraft paper, pure white paper, fine paper, coated paper, or art paper.

[0012] A fifth embodiment of the present disclosure is a nonwoven sheet in any of the first to fourth embodiments, wherein the air permeability of the nonwoven sheet is 20 to 1500 s / 100 ml.

[0013] The sixth embodiment of this disclosure is a nonwoven sheet in any of the first to fifth embodiments, wherein the sealing layer has a thickness of 0.5 μm or more and 15 μm or less.

[0014] According to the seventh aspect of the present disclosure, in any one of the first to sixth aspects, the heat-sealing layer is a non-woven sheet having a thickness of 2 μm or more and 30 μm or less.

[0015] According to the eighth aspect of the present disclosure, a sterilization packaging material includes a non-woven sheet in any one of the first to seventh aspects, and a base material film made of synthetic resin laminated on the heat-sealing layer of the non-woven sheet, and is a sterilization packaging material obtained by adhering the peripheries of the non-woven sheet and the base material film with an opening left.

[0016] According to the ninth aspect of the present disclosure, a sterilization lid material adhered to the flange portion of a synthetic resin container having a container body and a flange portion includes a non-woven sheet in any one of the first to seventh aspects.

Advantages of the Invention

[0017] According to the present disclosure, when opening the sterilization packaging material or peeling the sterilization lid material from the container, fibers are not exposed outward, and fibers do not mix into the medical device as foreign matters.

Brief Description of the Drawings

[0018] [Figure 1] FIG. 1 is a side sectional view showing a sterilization packaging material including a non-woven sheet according to the first embodiment of the present disclosure. [Figure 2] FIG. 2 is a side sectional view showing a non-woven sheet. [Figure 3] FIG. 3 is a view showing a state where both side edges of a non-woven sheet and a base material film are heat-sealed. [Figure 4] FIG. 4 is a view showing a state where a medical device is stored in a bag body made of a sterilization packaging material. [Figure 5] FIG. 5 is a view showing a process of manufacturing a non-woven sheet. [Figure 6] FIG. 6 is a view showing a process of cutting a web-shaped non-woven sheet to produce an elongated non-woven sheet. [Figure 7A]Figure 7A shows the heat-sealed side edge and the "inverted V" shaped heat-sealed portion of a sterilization packaging material. [Figure 7B] Figure 7B shows a modified example of the sterilization packaging material shown in Figure 7A. [Figure 7C] Figure 7C shows a modified example of the sterilization packaging material shown in Figure 7A. [Figure 7D] Figure 7D shows a modified version of the sterilization packaging material shown in Figure 7A. [Figure 8] Figure 8 shows a cross-sectional image of a nonwoven sheet. [Figure 9] Figures 9(A),(B), and(C) show images of the heat-sealed layer of sterile packaging material after opening. [Figure 10] Figures 10(A), (B), and (C) show images of the heat-sealed layer of sterile packaging material after opening. [Figure 11] Figure 11 shows a specific embodiment of the present disclosure. [Figure 12] Figure 12 shows a sterilization lid material including a nonwoven sheet according to a second embodiment of the present disclosure. [Modes for carrying out the invention]

[0019] <First Embodiment> Next, a first embodiment of this disclosure will be described with reference to the drawings.

[0020] Figures 1 to 11 show one embodiment of the present disclosure.

[0021] First, the sterilization packaging material 1 for storing medical instruments will be explained with reference to Figures 1 to 4 and Figure 7A. As shown in Figures 1 to 4 and Figure 7A, the sterilization packaging material 1 is breathable. An internal space 1a is formed inside the sterilization packaging material 1, and the medical instruments 5 are stored within this internal space 1a.

[0022] Such a sterilization packaging material 1 comprises a nonwoven sheet 10 that is impermeable to microorganisms but breathable, and a synthetic resin base film 2 laminated on the nonwoven sheet 10. By heat-sealing the periphery of the nonwoven sheet 10 and the base film 2, a heat-sealed portion 3 is formed at the periphery, and in this way a sterilization packaging material 1 having an internal space 1a is obtained.

[0023] Here, Figure 1 is a side cross-sectional view showing the sterilization packaging material 1, and Figures 3 and 7A are views of the sterilization packaging material 1 from the base film 2 side.

[0024] As described above, the sterilization packaging material 1 is manufactured by layering a base film 2 on a nonwoven sheet 10 and heat-sealing both sides of the nonwoven sheet 10 and the base film 2 parallel to the longitudinal direction L. In this case, the heat-sealed side edge portion 3a is formed by heat-sealing both sides of the nonwoven sheet 10 and the base film 2. In addition, a heat-sealed portion 3b in the shape of an "inverted V" in plan view is formed so as to overlap with the heat-sealed side edge portion 3a of both sides of the nonwoven sheet 10 and the base film 2, and the heat-sealed portion 3 is formed by these heat-sealed side edge portion 3a of the nonwoven sheet 10 and the base film 2 and the heat-sealed portion 3b in the shape of an "inverted V" in plan view. Furthermore, the sterilization packaging material 1 having an internal space 1a is formed by the nonwoven sheet 10 and the base film 2, and an opening 7 is formed on the opposite side of the "inverted V" shaped heat-sealed portion 3b of the internal space 1a by cutting the sterilization packaging material 1 in a direction perpendicular to the longitudinal direction L (see Figure 7A).

[0025] In this embodiment, a sterilization packaging material 1 having an internal space 1a is formed by a nonwoven sheet 10 and a base film 2. By providing an opening 7 in the sterilization packaging material 1, a bag body 1A for storing medical instruments 5 is constructed. Furthermore, after storing the medical instruments 5 in the internal space 1a through the opening 7, the opening 7 can be heat-sealed to close it, thereby allowing the medical instruments 5 to be stored in a breathable bag body 1A.

[0026] Of the heat-sealed portions 3, the heat-sealed portion 3b, which overlaps with the side edge heat-sealed portion 3a on the side edge and has an inverted V-shape in plan view, protrudes outward in the longitudinal direction L. When removing the medical instrument 5 from the internal space 1a of the bag body 1A, the base film 2 can be easily peeled from the nonwoven sheet 10 inward in the longitudinal direction L from the tip of the inverted V-shaped heat-sealed portion 3b. In this way, the bag body 1B can be opened from the heat-sealed portion 3b and the medical instrument 5 in the internal space 1a can be removed.

[0027] Next, the nonwoven sheet 10 will be explained below.

[0028] As shown in Figures 1 and 2, the nonwoven sheet 10 comprises a nonwoven sheet body 11, a sealing layer 12 provided on the nonwoven sheet body 11 and partially extending into the nonwoven sheet body 11, and a heat-seal layer 13 provided on the sealing layer 12.

[0029] In this embodiment, the nonwoven sheet body 11 is made of a fabric-like sheet that does not have woven fibers.

[0030] In this embodiment, the nonwoven sheet body 11 is impermeable to microorganisms but breathable, and includes "paper" and "nonwoven fabric". Of these, "paper" is a sheet-like material formed by intertwining plant fibers and shaping them into a thin, flat sheet. "Nonwoven fabric" is a sheet-like material formed by accumulating fibers in a certain direction or randomly and bonding them with adhesive resin, mechanically intertwining them, or fusing the fibers together. The materials of the nonwoven sheet body 11 will be described later.

[0031] Next, we will describe each component that makes up the nonwoven sheet 10.

[0032] As described above, the nonwoven sheet 10 comprises a nonwoven sheet body 11, a sealing layer 12, and a heat-seal layer 13.

[0033] Of these, the nonwoven sheet body 11 has a basis weight of 20 g / m². 2 ~90g / m 2Paper or nonwoven fabric can be used. For example, a basis weight of 75 g / m². 2 High-density polyethylene spunbond nonwoven fabric can be used. Here, spunbond nonwoven fabric refers to a nonwoven fabric of the direct-spun type.

[0034] Furthermore, a styrene-acrylic resin or an ethylene-vinyl acetate copolymer resin (EVA-based resin) can be used as the sealing layer 12.

[0035] Furthermore, the heat seal layer 13 can be made of a polyolefin-based material, such as polyethylene or polypropylene.

[0036] In this embodiment, a portion of the sealing layer 12 provided on the nonwoven sheet body 11 penetrates into the fibers of the nonwoven sheet body 11. The nonwoven sheet body 11 contains multiple fibers, and the fibers lack uniformity. In this embodiment, a portion of the sealing layer 12 penetrates into the fibers of the nonwoven sheet body 11 and adheres to it, thereby exhibiting an anchoring effect. Therefore, when the sterilization packaging material 1 is opened, the nonwoven sheet 10 and the base film 2 are separated, but no delamination occurs between the nonwoven sheet body 11 and the sealing layer 12. When the nonwoven sheet 10 and the base film 2 are separated, delamination occurs between the sealing layer 12 and the heat seal layer 13, or cohesive delamination occurs within the heat seal layer 13, causing the heat seal layer 13 to migrate toward the base film 2. In this way, the nonwoven sheet 10 and the base film 2 are separated.

[0037] Therefore, when opening the sterilization packaging material 1, some of the fibers of the nonwoven sheet body 11 do not migrate to the base film 2 side together with the heat seal layer 13 and become exposed to the outside, and some of the fibers of the nonwoven sheet body 11 that are exposed to the outside do not become mixed into the medical instrument 5 as foreign matter.

[0038] In other words, if a heat-seal layer is directly applied to the nonwoven sheet without providing a sealing layer, when the sterilization packaging material is opened, some of the fibers of the nonwoven sheet may migrate to the base film side along with the heat-seal layer and be exposed to the outside.

[0039] According to this embodiment, when the sterilization packaging material 1 is opened as described above, interlayer delamination occurs between the sealing layer 12 and the heat seal layer 13, or cohesive delamination occurs within the heat seal layer 13, and the heat seal layer 13 migrates toward the base film 2 side.

[0040] Therefore, when opening the sterilization packaging material 1, some of the fibers of the nonwoven sheet body 11 do not migrate to the base film 2 side together with the heat seal layer 13, and some of the fibers of the nonwoven sheet body 11 do not get mixed into the medical instrument 5.

[0041] In this embodiment, the base film 2 can be a multilayer or single-layer film. Furthermore, each layer of film can be made of a polyethylene-based resin, a polyethylene terephthalate-based resin, or a mixture thereof. For example, the base film 2 can be a polyethylene / polyethylene terephthalate film, a polyethylene film, or a polyethylene terephthalate film.

[0042] Next, the operation of this embodiment, which has the above configuration, will be described.

[0043] First, the manufacturing method of the nonwoven sheet 10 will be explained with reference to Figure 5. As shown in Figure 5, the web-shaped nonwoven sheet body 11 is fed from the paper feeding unit 30, and the nonwoven sheet body 11 is supplied between the gravure cylinder 31 and the impression cylinder 32. In this case, the nonwoven sheet body 11 may have a basis weight of, for example, 20 g / m2 to 90 g / m2, preferably 75 g / m2. 2 High-density polyethylene spunbond nonwoven fabric is used.

[0044] Next, a coating liquid that will form the sealing layer 12 inside the ink pan 41 is supplied from the furnisher roll 42 onto the gravure cylinder 31. The coating liquid on the gravure cylinder 31 is scraped off by the doctor blade 43 and then applied to the surface of the nonwoven sheet body 11 supplied between the gravure cylinder 31 and the impression cylinder 32.

[0045] The nonwoven sheet body 11, with the coating liquid applied to its surface, is then sent to the drying hood 33.

[0046] The coating liquid for the sealing layer 12 stored in the ink pan 41 contains a styrene-acrylic resin and water as a diluent. The water-containing diluent is then removed from the coating liquid applied to the surface of the nonwoven sheet body 11, which is sent to the drying hood 33, leaving a solid content of 1 to 10 g / m² on the surface of the nonwoven sheet body 11. 2 A styrene-acrylic resin remains. In this embodiment, the coating liquid for the sealing layer 12 contains a styrene-acrylic resin component (approximately 39% by weight), a water component (approximately 60% by weight), and an additive component. In this case, the sealing layer 12 has a thickness of 0.5 μm or more and 15 μm or less, preferably 1.0 μm or more and 4.0 μm or less, and a portion of the sealing layer 12 penetrates the nonwoven sheet body 11.

[0047] Next, the web-shaped nonwoven sheet body 11 is supplied between the gravure printing cylinder 35 and the impression cylinder 36.

[0048] During this time, the coating liquid that will become the heat seal layer 13 inside the ink pan 45 is supplied from the furnisher roll 46 onto the gravure cylinder 35. The coating liquid on the gravure cylinder 35 is scraped off by the doctor blade 47 and then applied to the surface of the nonwoven sheet body 11 that is supplied between the gravure cylinder 35 and the impression cylinder 36.

[0049] Subsequently, the nonwoven sheet body 11, with the coating liquid applied to its surface, is sent to the drying hood 37.

[0050] The coating liquid for the heat seal layer 13 stored in the ink pan 45 contains a polyolefin resin and water as a diluent. The water-containing diluent is then removed from the coating liquid applied to the surface of the nonwoven sheet body 11, which is sent to the drying hood 37, leaving a solid content of 2-15 g / m² on the surface of the nonwoven sheet body 11. 2 The polyolefin resin remains. In this embodiment, the coating liquid for the heat seal layer 13 contains a polyolefin resin component (approximately 26% by weight), a water component (approximately 73% by weight), and an additive component. In this case, the heat seal layer 13 has a thickness of 2 μm or more and 30 μm or less, preferably 5 μm or more and 15 μm or less. Specifically, polyethylene aqueous dispersion resin can also be used as the coating liquid for the heat seal layer 13.

[0051] In this way, a sealing layer 12 and a heat-seal layer 13 are sequentially formed on the surface of the nonwoven sheet body 11 to obtain a nonwoven sheet 10. The nonwoven sheet 10 thus formed is wound up in the winding section 40.

[0052] The nonwoven sheet 10 wound in the winding section 40 has an air permeability of 20 s / 100 ml or more and 1500 s / 100 ml or less. Here, the air permeability is a value conforming to the Wang Ren method of JIS P8117:2009.

[0053] In this embodiment, the high-density polyethylene spunbond nonwoven fabric that forms the nonwoven sheet body 11 has an air permeability of 8s / 100ml to 36s / 100ml. The nonwoven sheet 10 obtained by coating the nonwoven sheet body 11 with a sealing layer 12 and a heat-seal layer 13 has a higher air permeability value (worse air permeability) compared to the nonwoven sheet body 11, but still has an air permeability of 20s / 100ml or more and 1500s / 100ml or less, as described above, and has sufficient air permeability for the sterilization process described later. Here, the air permeability is a value in accordance with the Guarley air permeability TAPPI T460.

[0054] Next, the web-shaped nonwoven sheet 10 is cut along a cutting line 10a extending in the longitudinal direction L to obtain multiple elongated nonwoven sheets 10 (see Figure 6).

[0055] Next, the base film 2 is placed on top of the elongated nonwoven sheet 10 obtained in this way, and the nonwoven sheet 10 and the base film 2 are heat-sealed using a heat sealing machine (not shown).

[0056] In this case, the nonwoven sheet 10 is superimposed on the base film 2 with the heat-seal layer 13 facing the base film 2 side.

[0057] By heat sealing using such a heat sealing machine, side edge heat-sealed portions 3a are first formed on both side edges of the nonwoven sheet 10 and the base film 2 (see Figures 1 and 3). Next, a heat-sealed portion 3b, which is in the shape of an "inverted V" in plan view, is formed so as to intersect with the side edge heat-sealed portions 3a. Then, the side edge heat-sealed portions 3a provided on both side edges of the nonwoven sheet 10 and the base film 2, and the heat-sealed portion 3b, which is in the shape of an "inverted V" in plan view, form a heat-sealed portion 3 that joins the nonwoven sheet 10 and the base film 2 (see Figure 7A).

[0058] By heat-sealing the nonwoven sheet 10 and the base film 2 in this manner, a heat-sealed side edge portion 3a and a heat-sealed portion 3b shaped like an "inverted V" in plan view are formed, thereby obtaining a sterilization packaging material 1 for storing medical instruments 5.

[0059] Subsequently, as shown in Figure 7A, the sterilization packaging material 1 is cut at the front (upper in Figure 7) and rear (lower in Figure 7A) along the longitudinal direction L.

[0060] At this time, an opening 7 is formed below the sterilization packaging material 1, and in this way, a bag 1A having an internal space 1a is obtained from the sterilization packaging material 1.

[0061] In Figure 7A, the "inverted V" shaped heat seal portion 3b of the heat seal portion 3 has a tip portion 3c that protrudes outward in the longitudinal direction L. The overlapping portion of the side edge heat seal portion 3a and the "inverted V" shaped heat seal portion 3b becomes an overlapping portion 3d where heat sealing is applied twice. Next, we will further describe the overlapping portion 3d consisting of the overlapping portion of the side edge heat seal portion 3a and the "inverted V" shaped heat seal portion 3b in Figure 7A. As shown in Figure 7A, if the "inverted V" shaped seal bar 50 that forms the "inverted V" shaped heat seal portion 3b consists only of the mountain-shaped portion 51, the overlapping portion 3d is the portion where the side edge heat seal portion 3a and the "inverted V" shaped heat seal portion 3b formed by the mountain-shaped portion 51 of the seal bar 50 overlap. On the other hand, as shown in Figure 7D, if the inverted V-shaped seal bar 50 that forms the inverted V-shaped heat seal portion 3b has a V-shaped portion 51 and a pair of straight portions 52, 52 extending linearly from both ends of the V-shaped portion 51, the overlapping portion 3d is the portion where the side edge heat seal portion 3a and the portion of the seal bar 50 corresponding to the V-shaped portion 51 and the portion corresponding to the straight portions 52 overlap. In this way, by having the inverted V-shaped seal bar 50 have a V-shaped portion 51 and a pair of straight portions 52, 52 extending linearly from both ends of the V-shaped portion 51, the overlapping portion 3d can be reliably formed even if the side edge heat seal portion 3a and the portion corresponding to the seal bar 50 are slightly misaligned.

[0062] Next, the medical instrument 5 is placed in the internal space 1a through the opening 7, and the opening 7 of the bag 1A is heat-sealed, closing the entire circumference of the bag 1A (see Figure 4).

[0063] Subsequently, the bag 1A, in which the medical instruments 5 are stored within the internal space 1a and the entire circumference is sealed, is placed in a gas sterilization chamber (not shown), where the bag 1A is subjected to gas sterilization.

[0064] In this embodiment, since the nonwoven sheet 10 of the bag 1A is breathable, the medical instruments 5 inside the bag 1A can be reliably sterilized by gas sterilization of the bag 1A in a gas sterilization chamber.

[0065] When using a medical instrument 5 in a medical setting, the user first opens the bag 1A made of sterilization packaging material 1. At this time, the user breaks the "inverted V" shaped heat-seal portion 3b of the heat-seal portion 3 from the tip 3c that protrudes outward in the longitudinal direction L.

[0066] In this case, the "inverted V" shaped heat-sealed portion 3b is easily broken off from the tip portion 3c that protrudes outward in the longitudinal direction L, and in this way the bag 1A made of the sterilization packaging material 1 is opened.

[0067] Subsequently, the medical instrument 5 is removed from the internal space 1a of the bag 1A and used.

[0068] In this embodiment, a portion of the sealing layer 12 provided on the nonwoven sheet body 11 penetrates into the fibers of the nonwoven sheet body 11. Generally, the nonwoven sheet body 11 contains multiple fibers, and the fiber weave lacks uniformity.

[0069] According to this embodiment, the sealing layer 12 provided on the nonwoven sheet body 11 exhibits an anchoring effect by partially penetrating into the weave of the nonwoven sheet body 11 and adhering to it. Therefore, when opening the bag 1A made of the sterilization packaging material 1, the nonwoven sheet 10 and the base film 2 are separated. At this time, delamination does not occur between the nonwoven sheet body 11 and the sealing layer 12, but delamination occurs between the sealing layer 12 and the heat seal layer 13. Alternatively, cohesive delamination occurs within the heat seal layer 13, causing the heat seal layer 13 to migrate toward the base film 2. Therefore, when opening the bag 1A made of the sterilization packaging material 1, some of the fibers of the nonwoven sheet body 11 do not migrate toward the base film 2 along with the heat seal layer 13 and become exposed to the outside. Therefore, some of the fibers of the nonwoven sheet body 11 that are exposed to the outside do not become mixed into the medical instrument 5 as foreign matter. [Examples]

[0070] Next, specific embodiments of this disclosure will be described with reference to Figures 8 to 11.

[0071] This embodiment corresponds to the first embodiment shown in Figures 1 to 7A.

[0072] In this embodiment, first, the nonwoven sheet body 11 has a basis weight of 75 g / m². 2 A high-density polyethylene spunbond nonwoven fabric was prepared. This nonwoven fabric has good bacterial barrier properties, and no corona treatment was applied in order to maintain these properties.

[0073] Next, a coating liquid that will form the sealing layer 12 inside the ink pan 41 is supplied from the furnisher roll 42 onto the gravure cylinder 31. The coating liquid on the gravure cylinder 31 is scraped off by the doctor blade 43 and then applied to the surface of the nonwoven sheet body 11 supplied between the gravure cylinder 31 and the impression cylinder 32.

[0074] The nonwoven sheet body 11, with the coating liquid applied to its surface, is then sent to the drying hood 33.

[0075] The coating liquid for the sealing layer 12 stored in the ink pan 41 contains a styrene-acrylic resin and water as a diluent. The water-containing diluent is then removed from the coating liquid applied to the surface of the nonwoven sheet body 11, which is sent to the drying hood 33, leaving a solid content of 1 to 10 g / m² on the surface of the nonwoven sheet body 11. 2 A styrene-acrylic resin remains. In this embodiment, the coating liquid for the sealing layer 12 contains a styrene-acrylic resin component (approximately 39% by weight), a water component (approximately 60% by weight), and an additive component. In this case, the sealing layer 12 has a thickness of 0.5 μm or more and 15 μm or less, preferably 1.0 μm or more and 4.0 μm or less, and a portion of the sealing layer 12 penetrates the nonwoven sheet body 11.

[0076] Next, the web-shaped nonwoven sheet body 11 is supplied between the gravure printing cylinder 35 and the impression cylinder 36.

[0077] Meanwhile, the coating liquid that becomes the heat-sealing layer 13 in the ink pan 45 is supplied from the finisher roll 46 onto the gravure plate cylinder 35. After the coating liquid on the gravure plate cylinder 35 is scraped off by the doctor blade 47, it is applied to the surface of the non-woven sheet body 11 supplied between the gravure plate cylinder 35 and the pressure cylinder 36.

[0078] After that, the non-woven sheet body 11 with the coating liquid applied to its surface is sent to the drying hood 37.

[0079] The coating liquid for the heat-sealing layer 13 stored in the ink pan 45 contains a polyolefin-based resin and water as a diluting component. Then, the diluting component containing water is removed from the coating liquid applied to the surface of the non-woven sheet body 11 sent to the drying hood 37, and 2 to 15 g / m of the polyolefin-based resin remains on the surface of the non-woven sheet body 11 as a solid content. 2 In the present embodiment, the coating liquid for the heat-sealing layer 13 contains a polyolefin-based resin component (weight ratio of about 26%), a water component (weight ratio of about 73%), and an additive component. In this case, the heat-sealing layer 13 has a thickness of 2 μm or more and 30 μm or less, preferably 5 μm or more and 15 μm or less. Specifically, a polyethylene aqueous dispersion resin can also be used as the coating liquid for the heat-sealing layer 13.

[0080] In this way, the blocking layer 12 and the heat-sealing layer 13 are sequentially formed on the surface of the non-woven sheet body 11 to obtain the non-woven sheet 10. The non-woven sheet 10 formed in this way is wound up at the winding section 40.

[0081] On the other hand, the base material film 2 was prepared from a film having the following configuration. A polyethylene / polyethylene terephthalate film, or a polyethylene film, or a polyethylene terephthalate film.

[0082] Subsequently, the wound nonwoven sheet 10 was cut along its longitudinal direction L to produce an elongated nonwoven sheet 10. Next, the elongated nonwoven sheet 10 having the above-described configuration and the base film 2 were overlapped and heat-sealed to form a heat-sealed portion 3. In this case, the nonwoven sheet 10 is overlapped with the base film 2 such that the heat-sealed layer 13 faces the base film 2. In addition, a polyethylene layer is provided on at least the side of the base film 2 that faces the nonwoven sheet 10.

[0083] In this way, a sterilization packaging material 1 is obtained, comprising a nonwoven sheet 10 and a base film 2, with the nonwoven sheet 10 and the base film 2 joined by a heat seal portion 3.

[0084] In this embodiment, as shown in Figure 11, the solid content in the coating layer for sealing is 1.2 to 5.2 g / m². 2 The solid content in the coating layer for the heat seal layer is 2.0 to 5.0 g / m². 2 That was the case.

[0085] Furthermore, the air permeability of sterilization packaging material 1 was 83-952 (s / 100ml). Since the general required air permeability for sterilization packaging materials is 1000 (s / 100ml), sterilization packaging material 1 maintained sufficient air permeability.

[0086] Furthermore, the heat seal strength (HS strength) of the heat seal portion 3 that joins the nonwoven sheet 10 and the base film 2 was 1.2 to 4.2 (N / 15mm width), ensuring sufficient heat seal strength.

[0087] Next, the details of the nonwoven sheet according to this embodiment will be described with reference to Figures 8 to 10(A),(B), and(C).

[0088] Here, Figure 8 shows an image of a cross-section of a nonwoven sheet, and Figures 9(A)(B)(C) and 10(A)(B)(C) show images of the heat-sealed layer of the sterilization packaging material after opening.

[0089] As shown in Figures 8 and 11, in the nonwoven sheet 10, the sealing layer 12 provided on the nonwoven sheet body 11 had a thickness of 1.93 μm or more and 3.30 μm or less, and the heat seal layer 13 provided on the sealing layer 12 had a thickness of 11.28 μm or more and 12.65 μm or less. In this case, the thickness of the sealing layer 12 and the thickness of the heat seal layer 13 were both obtained by visually measuring the distance between 10 points separated vertically in the cross-sectional image of the nonwoven sheet shown in Figure 8, and taking the average of the measured values. Here, the cross-sectional image of the nonwoven sheet shown in Figure 8 is an image taken using the laser microscope described below. Keyence Corporation Color 3D Laser Microscope VK-8710 Imaging conditions: 50x objective lens magnification Magnification on a 15-inch monitor: 1000x The cross-sectional image shown in Figure 8 was obtained by slicing a nonwoven fabric sample with a sliding microtome and observing the sliced ​​cross-section of the sample. Furthermore, the 10 measurement points were selected at approximately equal intervals from any width of about 100 μm on the sliced ​​nonwoven fabric sample.

[0090] Furthermore, Figures 9(A), 9(B), and 9(C) illustrate the heat seal layer 13 that has migrated to the base film 2 side at the leading edge 3c of the heat seal layer 13. In this case, Figures 9(A), 9(B), and 9(C) are images of the heat seal layer 13 at 20x, 100x, and 500x magnification, respectively, relative to visual observation. As shown in Figures 9(A), 9(B), and 9(C), in all cases, no fibers of the nonwoven sheet body 11 were observed on the heat seal layer 13.

[0091] Furthermore, Figures 10(A), (B), and (C) illustrate the heat-seal layer 13 that has migrated to the base film 2 side in the overlapping portion 3d of the heat-seal portion 3. In this case, Figures 10(A), (B), and (C) are images of the heat-seal layer 13 at 20x, 100x, and 500x magnification, respectively, relative to visual observation. As shown in Figures 10(A), (B), and (C), in all cases, no fibers of the nonwoven sheet body 11 were observed on the heat-seal layer 13. Here, the images of the heat-seal layer shown in Figures 9(A), (B), and (C) and 10(A), (B), and (C) were captured using the laser microscope described above.

[0092] In this embodiment, both the coating liquid for the sealing layer and the coating liquid for the heat-seal layer applied to the nonwoven sheet body 11 contain water as a diluent. Therefore, when the nonwoven sheet body 11 was sent to the drying hoods 33 and 37 after the coating liquid was applied, the diluent could be safely and reliably removed from the nonwoven sheet body 11 without particularly strong heating inside the drying hoods 33 and 37. Also, because the coating liquid contains water as a diluent, the coating operation on the nonwoven sheet body 11 could be carried out more safely compared to when using a coating liquid containing an organic solvent.

[0093] Next, modifications of the present disclosure will be described with reference to Figures 7B and 7C. The modifications shown in Figures 7B and 7C are substantially the same as those of the first embodiment shown in Figure 7A, except that the heat seal configuration between the nonwoven sheet 10 and the base film 2 is different. In the modifications shown in Figures 7B and 7C, the same reference numerals are used for parts that are the same as those in the embodiment shown in Figure 7A, and detailed descriptions are omitted. Here, Figures 7B and 7C show the sterilization packaging material 1 as viewed from the base film 2 side.

[0094] In the modified example shown in Figure 7B, a base film 2 is superimposed on a nonwoven sheet 10, and the product is manufactured by heat-sealing both side edges parallel to the longitudinal direction L of the nonwoven sheet 10 and the base film 2. In this case, a side edge heat-seal portion 3a is formed by heat-sealing both side edges of the nonwoven sheet 10 and the base film 2. In addition, a heat-seal portion 3b in the shape of an "inverted V" in plan view is formed so as to overlap with the side edge heat-seal portions 3a of both side edges of the nonwoven sheet 10 and the base film 2, and the heat-seal portion 3 is composed of these side edge heat-seal portions 3a of the nonwoven sheet 10 and the base film 2 and the heat-seal portion 3b in the shape of an "inverted V" in plan view. Furthermore, a sterilization packaging material 1 having an internal space 1a is formed by the nonwoven sheet 10 and the base film 2, and an opening 7 is formed on the opposite side of the "inverted V" shaped heat-seal portion 3b of the internal space 1a by cutting the sterilization packaging material 1 in a direction perpendicular to the longitudinal direction L (see Figure 7B).

[0095] In this modified example, a sterilization packaging material 1 having an internal space 1a is formed by a nonwoven sheet 10 and a base film 2. By providing an opening 7 in the sterilization packaging material 1, a bag body 1A for storing medical instruments 5 is constructed. Furthermore, after storing the medical instruments 5 in the internal space 1a through the opening 7, the opening 7 can be heat-sealed to close it, allowing the medical instruments 5 to be stored in a sterile state within the breathable bag body 1A.

[0096] Of the heat-sealed portions 3, the heat-sealed portion 3b, which intersects with the side edge heat-sealed portion 3a of the side edge and has an inverted V-shape in plan view, protrudes outward in the longitudinal direction L. When removing the medical instrument 5 from the internal space 1a of the bag body 1A, the base film 2 can be easily peeled from the nonwoven sheet 10 inward in the longitudinal direction L from the tip of the inverted V-shaped heat-sealed portion 3b. In this way, the bag body 1B can be opened from the heat-sealed portion 3b and the medical instrument 5 in the internal space 1a can be removed.

[0097] In Figure 7B, the "inverted V" shaped heat seal portion 3b of the heat seal portion 3 has a tip portion 3c that protrudes outward in the longitudinal direction L. The overlapping portion of the side edge heat seal portion 3a and the "inverted V" shaped heat seal portion 3b forms an overlapping portion 3d where heat sealing is applied twice. As shown in Figure 7B, the side edge heat seal portion 3a extends from the "inverted V" shaped heat seal portion 3b toward the opening 7 and ends just before the opening 7. Therefore, the medical instrument 5 can be easily and simply stored in the internal space 1a through the opening 7. The side edge heat seal portion 3a does not extend from the "inverted V" shaped heat seal portion 3b toward the opposite side of the opening 7. Next, the overlapping portion 3d, which consists of the overlapping portion of the side edge heat seal portion 3a and the "inverted V" shaped heat seal portion 3b in Figure 7B, will be described further. As shown in Figure 7B, when the inverted V-shaped sealing bar 50 that forms the inverted V-shaped heat seal portion 3b has a V-shaped portion 51 and a pair of straight portions 52, 52 extending linearly from both ends of the V-shaped portion 51, the overlapping portion 3d is the part where the side edge heat seal portion 3a and the portion of the sealing bar 50 corresponding to the straight portions 52 overlap. In this way, by having the inverted V-shaped sealing bar 50 have a V-shaped portion 51 and a pair of straight portions 52, 52 extending linearly from both ends of the V-shaped portion 51, the overlapping portion 3d can be reliably formed even if the side edge heat seal portion 3a and the portion corresponding to the sealing bar 50 are slightly misaligned. Furthermore, as shown in Figure 7B, the configuration in which the "inverted V" shaped seal bar 50 that forms the "inverted V" shaped heat seal portion 3b has a mountain-shaped portion 51 and a pair of straight portions 52, 52 that extend linearly from both ends of the mountain-shaped portion 51, and the overlapping portion 3d is the part where the side edge heat seal portion 3a and the portion of the seal bar 50 corresponding to the straight portion 52 overlap, can also be applied to the overlapping portion 3d shown in Figure 7C, which will be described later.

[0098] Furthermore, in the modified example shown in Figure 7C, the sterilization packaging material 1 is manufactured by layering a base film 2 on a nonwoven sheet 10 and heat-sealing both side edges parallel to the longitudinal direction L of the nonwoven sheet 10 and the base film 2. In this case, the side edge heat-sealed portion 3a is formed by heat-sealing both side edges of the nonwoven sheet 10 and the base film 2. In addition, a heat-sealed portion 3b in the shape of an "inverted V" in plan view is formed so as to intersect with the side edge heat-sealed portions 3a of both side edges of the nonwoven sheet 10 and the base film 2, and the heat-sealed portion 3b in the shape of an "inverted V" in plan view constitutes the heat-sealed portion 3. Furthermore, the sterilization packaging material 1 having an internal space 1a is formed by the nonwoven sheet 10 and the base film 2, and an opening 7 is formed on the opposite side of the "inverted V" shaped heat-sealed portion 3b of the internal space 1a by cutting the sterilization packaging material 1 in a direction perpendicular to the longitudinal direction L (see Figure 7C).

[0099] In this modified example, a sterilization packaging material 1 having an internal space 1a is formed by a nonwoven sheet 10 and a base film 2. By providing an opening 7 in the sterilization packaging material 1, a bag body 1A for storing medical instruments 5 is constructed. Furthermore, after storing the medical instruments 5 in the internal space 1a through the opening 7, the opening 7 can be heat-sealed to close it, thereby allowing the medical instruments 5 to be stored in a breathable bag body 1A.

[0100] Of the heat-sealed portions 3, the heat-sealed portion 3b, which intersects with the side edge heat-sealed portion 3a of the side edge and has an inverted V-shape in plan view, protrudes outward in the longitudinal direction L. When removing the medical instrument 5 from the internal space 1a of the bag body 1A, the base film 2 can be easily peeled from the nonwoven sheet 10 inward in the longitudinal direction L from the tip of the inverted V-shaped heat-sealed portion 3b. In this way, the bag body 1B can be opened from the heat-sealed portion 3b and the medical instrument 5 in the internal space 1a can be removed.

[0101] In Figure 7C, the "inverted V" shaped heat seal portion 3b of the heat seal portion 3 has a tip portion 3c that protrudes outward in the longitudinal direction L. The overlapping portion of the side edge heat seal portion 3a and the "inverted V" shaped heat seal portion 3b becomes an overlapping portion 3d where heat sealing is applied twice. As shown in Figure 7C, the side edge heat seal portion 3a extends from the "inverted V" shaped heat seal portion 3b toward the opening 7 and ends just before the opening 7. Therefore, the medical instrument 5 can be easily and simply stored in the internal space 1a from the opening 7. Also, the side edge heat seal portion 3a does not extend from the "inverted V" shaped heat seal portion 3b toward the opposite side of the opening 7. In the modified example shown in Figure 7C, the side edge heat seal portion 7a does not extend from the "inverted V" shaped heat seal portion 3b toward the opposite side of the opening 7, but instead a pair of point-shaped heat seal portions 3e are formed on the outside of the internal space 1a partitioned by the "inverted V" shaped heat seal portion 3b. In Figure 7C, the nonwoven sheet 10 and the base film 2 can be bonded together by heat sealing using this pair of dot-shaped heat-seal portions 3e.

[0102] <Second Embodiment> Next, a second embodiment of the present disclosure will be described with reference to Figure 12. The second embodiment shown in Figure 12 uses a nonwoven sheet as a sterilization lid material, and the other configurations are substantially the same as those of the first embodiment shown in Figures 1 to 10. As shown in Figure 12, a synthetic resin container 20 having a container body 21 and a flange portion 22 may be prepared, and the nonwoven sheet 10 may be attached to the flange portion 22 of this container 20 by heat sealing. In Figure 12, the container 20 is a single-layer container made of polyethylene terephthalate, or a single-layer container made of polypropylene, or a multi-layer container made of polyethylene terephthalate / polypropylene. The nonwoven sheet 10 is also overlapped with the heat-seal layer 13 facing the flange portion 22 side.

[0103] As shown in Figure 12, the nonwoven sheet 10 attached to the flange portion 22 by heat sealing constitutes the sterilization cover material 25.

[0104] In this embodiment, the medical instrument 5 is first placed inside the container 20, and the nonwoven sheet 10 is heat-sealed to the flange portion 22 to cover the container 20. In this case, the nonwoven sheet 10 becomes a sterilization lid material 25.

[0105] The container 20 can be manufactured using any molding method, such as injection molding, sheet molding, or blow molding. The container 20 can then be closed by heat-sealing the nonwoven sheet 10 to the flange portion 22.

[0106] When the sterilization lid material 25 is peeled off from the flange portion 22 of the container 20, the heat seal layer 13 of the sterilization lid material 25 moves toward the flange portion 22 side. In this case, no fibers of the nonwoven sheet body 11 that make up the nonwoven sheet 10 remain on the heat seal layer 13 side, and therefore, no remaining fibers will get mixed into the medical instrument 5. [Explanation of symbols]

[0107] 1 Sterilization packaging materials 1a Internal space 1A bag body 2. Base film 3. Heat seal section 3a Side edge heat seal section 3b Inverted V-shaped heat seal section 5. Medical devices 7 aperture 10 Nonwoven Sheets 10a Cutting line 11 Nonwoven sheet main body 12. Sealing layer 13 Heat seal layer 20 containers 21 Container body 22 Flange section 25 Sterilization lid material

Claims

1. In sterile packaging materials for storing medical instruments, A nonwoven sheet that is breathable, comprising a nonwoven sheet body, a sealing layer provided on the nonwoven sheet body and partially penetrating into the nonwoven sheet body, and a heat-seal layer provided on the sealing layer, The nonwoven sheet comprises a synthetic resin base film laminated on the heat-seal layer, This is obtained by bonding the nonwoven sheet and the base film, leaving an opening at the periphery. The sealing layer contains a styrene-acrylic resin, The heat-seal layer is a sterilization packaging material containing polyethylene aqueous dispersion resin.

2. The sterilization packaging material according to claim 1, wherein the nonwoven sheet body includes high-density polyethylene spunbond nonwoven fabric, sterile paper, kraft paper, pure white paper, fine paper, coated paper, or art paper.

3. The sterilization packaging material according to claim 1, wherein the air permeability of the nonwoven sheet is 20 to 1500 s / 100 ml.

4. The sterilization packaging material according to claim 1, wherein the sealing layer has a thickness of 0.5 μm or more and 15 μm or less.

5. The sterilization packaging material according to claim 1, wherein the heat seal layer has a thickness of 2 μm or more and 30 μm or less.

6. A synthetic resin container having a container body and a flange portion, with medical instruments housed inside, A combination of a container and a sterilization lid, comprising a sterilization lid material bonded to the flange portion, The sterilization lid material is made of a breathable nonwoven sheet, and the nonwoven sheet comprises a nonwoven sheet body, a sealing layer provided on the nonwoven sheet body and partially penetrating into the nonwoven sheet body, and a heat-seal layer provided on the sealing layer. The sealing layer contains a styrene-acrylic resin, The heat-seal layer comprises a polyethylene aqueous dispersion resin, and the combination of the container and the sterilization lid material.

Images