JP2016199298A - Medical packaging sheet and medical packing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical packaging sheet and a medical packing material having self-adhesion preventing properties.SOLUTION: A medical packaging sheet 30 is used for forming a packaging material for a medical content, and a plurality of recesses and protrusions are formed on one surface 30a of the medical packaging sheet. When T is the thickness of the medical packaging sheet, Ra/T, the arithmetic average roughness (Ra) of the one surface in which the recesses and protrusions are formed per unit sheet thickness, is 4×10or more and 2×10or less, and Rsm/T, the average interval (Rsm) of the recesses and protrusions on the one surface in which the recesses and protrusions are formed per unit sheet thickness, is 0.4 or more and 4.5 or less.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a medical packaging sheet and a medical packaging material.

  Conventionally, two performances described below have been required for sheet materials used to form packaging materials for contents for medical use. First, the required performance is that the packaged contents can be visually recognized, that is, transparency. Secondly, the required performance is such a strength that the packaging material is not damaged even if the contents are packaged. Conventionally, various studies have been made to improve the above-described two characteristics of the sheet material used for forming a packaging material for contents for medical use.

  For example, there are the following techniques that focus on the improvement of the two characteristics required for the sheet material used to form a packaging material for contents for medical use.

  Patent Document 1 discloses a sheet material used for forming a packaging material obtained by molding a resin composition containing two kinds of hydrogenated block copolymers and a polyolefin resin in a specific ratio. .

JP 2010-106200 A JP 2006-75399 A

  The above-mentioned conventional sheet material has such a strength that the packaging material is not damaged even when the contents are packaged, and is transparent enough to visually recognize the contents when the packaging material is formed using the sheet material. A certain degree of effect can be expected in that it can be realized. However, the present inventor has found that the yield of the packaging material that achieves both the adhesion between the sheet materials and sufficient transparency is not sufficiently improved even when the conventional sheet material is used. Therefore, as a result of earnestly examining the factors that do not sufficiently improve the yield when forming a packaging material using a conventional sheet material, the present inventors have found the following problems.

  When a conventional sheet material is manufactured as a packaging material, the surface state of the sheet material may be slightly changed. The present inventor has found that subtle changes in the surface state that occur in conventional sheet materials affect the productivity and quality of packaging materials. Therefore, as a result of intensive investigations to suppress the occurrence of subtle changes in the surface state of the sheet material, the present inventor prevents mutual adhesion between the sheet materials in order to improve the productivity and quality of the packaging material. We found that it is important to improve performance. Thus, the conventional sheet material has room for improvement in terms of preventing mutual adhesion between the sheet materials.

  In addition, the sheet material before processing is usually in a state of being wound in a roll shape, that is, in a state of an original fabric, and in order to produce a packaging material, a necessary amount from the original fabric is required. It was necessary to unwind and use the sheet material.

  Then, this invention makes it a subject to provide the medical packaging material provided using the said medical packaging sheet while providing the medical packaging sheet provided with the mutual adhesion prevention property.

  As a result of intensive research in order to achieve the above-mentioned problems, the present inventor improved the mutual adhesion prevention property that one surface on which irregularities were formed in the medical packaging sheet was configured to satisfy a specific condition. The present invention has been completed by obtaining knowledge that is effective as a design guide for achieving the above.

According to the present invention, a medical packaging sheet used for forming a packaging material for contents for medical use,
A plurality of irregularities are formed on one surface of the medical packaging sheet,
When the thickness of the medical packaging sheet is T,
The value of the arithmetic mean roughness (Ra) of the one surface on which the unevenness per unit sheet thickness is formed, Ra / T is 4 × 10 ⁻⁴ or more and 2 × 10 ⁻² or less, and the unit Provided is a medical packaging sheet in which the value of the average unevenness (Rsm) of the one surface on which the unevenness per sheet thickness is formed, Rsm / T is 0.4 or more and 4.5 or less.

  Furthermore, according to this invention, the medical packaging material formed with the said medical packaging sheet is provided.

  ADVANTAGE OF THE INVENTION According to this invention, while providing the medical packaging sheet provided with the mutual adhesion prevention property, the medical packaging material formed using the said medical packaging sheet can be provided.

It is a figure for demonstrating the manufacturing method of the medical packaging sheet which concerns on this embodiment. It is typical sectional drawing which shows the layer structure of the medical packaging sheet which concerns on this embodiment. It is a figure which shows the infusion bag which has the packaging material which concerns on this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

<Medical packaging sheet>

The medical packaging sheet in this embodiment is used for forming a packaging material for contents for medical use. A plurality of irregularities are formed on one surface of the medical packaging sheet. Furthermore, the medical packaging sheet in this embodiment has an arithmetic average roughness (Ra) of one surface on which unevenness per unit sheet thickness is formed, where T is the thickness of the medical packaging sheet. Value, Ra / T is 4 × 10 ⁻⁴ or more and 2 × 10 ⁻² or less, and the unevenness average interval (Rsm) of one surface on which unevenness per unit sheet thickness is formed, Rsm / T is 0.4 or more and 4.5 or less. By doing so, it is possible to realize a medical packaging sheet having a sufficient anti-adhesion property so that the sheet materials can be prevented from adhering to each other at the time of unwinding from the original fabric. .

  The contents for medical use in the present embodiment include, for example, infusion preparations used as infusions at medical sites such as physiological saline, glucose solution, Ringer's solution, liquids such as blood components used when transfused at medical sites, For example, it refers to medical instruments such as a syringe, a scalpel, and a rubber stopper.

  As described in the background art section, conventionally, medical packaging sheets have been required to have the following two performances. The first performance required for the medical packaging sheet is transparency so that the packaged contents can be visually recognized. The second performance required for the medical packaging sheet is such a strength that the packaging material formed using the medical packaging sheet is not damaged even if the contents are packaged. Specifically, in the present embodiment, the strength refers to the sealing strength and material strength of the medical packaging sheet forming the packaging material.

  However, the technical level required for medical packaging sheets has been increasing in recent years. Therefore, in addition to the two performances described above, the medical packaging sheet is also required to have the two performances described below. The third performance required for the medical packaging sheet is that impurities are not transferred from the inner surface of the packaging material formed using the medical packaging sheet to the contents contained in the packaging material. Elution. A fourth performance required for the medical packaging sheet is that the sheet does not change before and after sterilization.

  Based on the technical level required for such medical packaging sheets, the present inventor has found that there is room for improvement in the conventional medical packaging sheets in terms of preventing mutual adhesion between the sheets.

  As described above, the medical packaging sheet according to the present embodiment has an arithmetic average roughness (Ra), a value of Ra / T, and a unit sheet thickness per unit sheet thickness. The unevenness average interval (Rsm) on the surface where the unevenness is formed and the value of Rsm / T are controlled so as to have specific values, respectively. Thus, the slipperiness | lubricity of the medical packaging sheet surface can be improved by setting one surface which formed the unevenness | corrugation as the structure which satisfy | fills specific conditions. Therefore, the medical packaging sheet according to the present embodiment can achieve sufficient anti-adhesion properties to the extent that the sheet materials can be prevented from adhering to each other when unwinding from the original fabric. It becomes possible. Moreover, the medical packaging sheet which concerns on this embodiment can satisfy | fill the four required performances mentioned above by forming the unevenness | corrugation which satisfy | fills specific conditions on the surface.

The Ra / T value and the Rsm / T value of the medical packaging sheet according to this embodiment have a Ra / T value of 4 × 10 ⁻⁴ or more and 2 × 10 ⁻² or less, and Rsm. The value of / T is 0.4 or more and 4.5 or less. Preferably, the value of Ra / T is 6.6 × 10 ⁻⁴ or more and 1.3 × 10 ⁻³ or less, and Rsm / The value of T is 0.6 or more and 2.7 or less. By carrying out like this, the mutual adhesion prevention property in the said medical packaging sheet can be improved.

  Here, the arithmetic average roughness (Ra) is generally the average line when the average line is drawn on the roughness curve formed on the cross section of the measurement object for the plurality of irregularities formed on the surface. The average value of the height of the convex part and the concave part from is indicated by a value in μm. The average line is S1 when the sum of the areas of the convex portions located above the average line is S1, and the sum of the areas of the concave portions located below the average line is S2. = A line drawn on the roughness curve so that S2. Based on the above-described definition of arithmetic average roughness (Ra), the Ra / T scale in the present embodiment is calculated from the top of the concave portion to the convex portion of the plurality of concave and convex portions formed on the surface of the medical packaging sheet. This is an index indicating how much of the height to the top of the sheet occupies the sheet thickness. The arithmetic average roughness (Ra) can be measured according to JIS-B0601 (1994).

  The unevenness average interval (Rsm) generally refers to the average value of the unevenness period in the roughness curve formed on the cross section of the measurement object. Based on the definition of the uneven average interval (Rsm) described above, the measure Rsm / T in the present embodiment is the thickness of the sheet and the thickness of the plurality of unevenness formed on the surface of the medical packaging sheet. It becomes an index indicating the balance with the formation interval of the irregularities in the in-plane direction of the sheet. In addition, an uneven | corrugated average space | interval (Rsm) can be measured according to JIS-B0601 (1994).

  Based on the above, as described above, the plurality of irregularities formed on the surface of the medical packaging sheet according to the present embodiment has a specific value of Ra / T and a value of Rsm / T, respectively. It is controlled to become. For this reason, the medical packaging sheet according to the present embodiment is sufficient to prevent the sheet materials from adhering to the surface of the sheet when unwinding from the original fabric. It can be said that the unevenness | corrugation of the exquisite state to which the anti-wearing property can be provided was formed.

  The thickness T of the medical packaging sheet is preferably 100 μm or more, and more preferably 150 μm or more, from the viewpoint of improving the adhesion of the sheet forming the packaging material.

  The thickness T of the medical packaging sheet is preferably 350 μm or less, more preferably 300 μm or less, from the viewpoint of improving the visibility of the contents when the packaging material is formed using the sheet.

  The arithmetic average roughness (Ra) of the surface on which the unevenness in the medical packaging sheet is formed is preferably 0.15 μm or more and 2 μm or less, more preferably from the viewpoint of improving the mutual adhesion prevention property of the sheet. , 0.2 μm or more and 1 μm or less.

  The average unevenness interval (Rsm) on the surface where the unevenness is formed in the medical packaging sheet is preferably 150 μm or more and 450 μm or less, more preferably 200 μm or more, from the viewpoint of improving the mutual adhesion prevention property of the sheet. 400 μm or less.

  The unevenness formed on the medical packaging sheet may be formed on both surfaces of the sheet, but from the viewpoint of satisfying the above four required characteristics, it is desirable that the unevenness is formed only on one surface of the sheet. When the unevenness is formed only on one side of the sheet, the unevenness is arranged on the side in contact with the contents in the packaging material formed using the sheet from the viewpoint of satisfying the above four required characteristics. Is preferable.

  The uneven shape is not limited as long as the value of Ra / T and the value of Rsm / T satisfy the specific conditions described above. This uneven shape can be a geometrical shape such as a pyramid shape or a cone shape, even if it has a cross-sectional shape such as a rectangular shape, a diamond shape, a triangular shape, a wave shape, an elliptical shape, a circular shape, or a trapezoidal shape. Even if it exists, various picture patterns, such as a skin pattern, a satin texture, a cloth texture, a synthetic leather like thought pattern, and a stripe pattern, may be sufficient.

The medical packaging sheet in the present embodiment is a value of the maximum protrusion height (Rp) of the surface on which irregularities are formed per unit sheet thickness, where T is the thickness of the medical packaging sheet, that is, The value of Rp / T is preferably 1.1 × 10 ⁻³ or more and 2 × 10 ⁻² or less, and more preferably 1.6 × 10 ⁻³ or more and 1 × 10 ⁻² or less. By doing so, it is possible to produce a good raw fabric using the sheet, and to produce a packaging material excellent in balance of transparency and seal strength using the sheet, and Mutual adhesion prevention can be improved.

  Here, the maximum protrusion height (Rp) is generally the average line when the average line is drawn on the roughness curve formed on the cross section of the measurement object for the plurality of irregularities formed on the surface. The value which shows the maximum height of the convex part located upwards. The average line is S1 when the sum of the areas of the convex portions located above the average line is S1, and the sum of the areas of the concave portions located below the average line is S2. = A line drawn on the roughness curve so that S2. Based on the definition of the maximum protrusion height (Rp) described above, for a plurality of irregularities formed on the surface of the medical packaging sheet according to the present embodiment, when the value of Rp / T is controlled, It is possible to suppress variation in the degree of unevenness with respect to the sheet thickness. For this reason, when the medical packaging sheet according to the present embodiment is controlled so that the value of Rp / T satisfies a specific condition, the mutual adhesion preventing property of the sheet can be further improved. The maximum protrusion height (Rp) can be measured according to JIS-B0601 (1994).

  The maximum protrusion height (Rp) on the surface where the irregularities are formed in the medical packaging sheet is preferably 0.4 μm or more and 2 μm or less, more preferably, from the viewpoint of improving the mutual adhesion prevention property of the sheet. , 0.5 μm or more and 1.5 μm or less.

  Here, from the viewpoint of improving the mutual adhesion prevention property of the medical packaging sheet, the medical packaging sheet according to this embodiment was formed with unevenness in the medical packaging sheet measured by a specific method described below. The surface static friction coefficient 1 is preferably 0.1 or more and 2.5 or less, more preferably 0.1 or more and 2 or less, and further preferably 0.1 or more and 1.8 or less. When the medical packaging sheet according to this embodiment is processed into a raw fabric, the surface on which the unevenness of the medical packaging sheet is formed and the surface opposite to the surface on which the unevenness of the medical packaging sheet is formed Are wrapped around each other. Therefore, the value of the static friction coefficient between the surface of the medical packaging sheet on which the unevenness is formed and the surface opposite to the surface on which the unevenness of the medical packaging sheet is formed, measured under the specific conditions described above is controlled. As a result, it is possible to impart good sheet slipperiness to the sheet. In this embodiment, the coefficient of static friction 1 of the surface on which the unevenness is formed in the one medical packaging sheet is the other medical packaging on the surface on which the unevenness of the one medical packaging sheet is formed. Measurement is performed by superposing the surface opposite to the surface on which the unevenness of the sheet is formed, using the one medical packaging sheet and the other medical packaging sheet, and performing a friction test according to JIS K7125. When it does, it refers to the coefficient of static friction between the surface of the medical packaging sheet of the one side where the irregularities are formed and the surface opposite to the surface of the other medical packaging sheet where the irregularities are formed.

  In the medical packaging sheet of the present embodiment, the coefficient of static friction 2 of the surface on which the unevenness is formed in the medical packaging sheet measured by a specific method described below is 0.1 or more and 2.5 or less. Preferably, it is 0.1 or more and 2 or less, more preferably 0.1 or more and 1.8 or less. By doing so, it becomes possible to further improve the anti-attachment property of the surface on which the unevenness of the sheet is formed. In the present embodiment, the static friction coefficient 2 of the surface on which the unevenness is formed in the one medical packaging sheet is the other medical packaging on the surface on which the unevenness of the one medical packaging sheet is formed. The surface of the sheet opposite to the surface on which the unevenness is formed is overlapped, and the one medical packaging sheet and the other medical packaging sheet are used, and the one medical packaging sheet and the above After applying a load of 1 kg to the other medical packaging sheet for 24 hours, and performing a friction test according to JIS K7125, the surface on which the unevenness in the medical packaging sheet of the above one was formed and the above It refers to the coefficient of static friction with the surface opposite to the surface on which the unevenness is formed in the other medical packaging sheet.

  The medical packaging sheet in the present embodiment preferably has a coefficient of static friction 3 of the surface on which irregularities of the medical packaging sheet measured by a specific method described below are 0.1 or more and 2 or less, It is more preferably 0.1 or more and 1.8 or less, and further preferably 0.1 or more and 1.6 or less. By doing so, it becomes possible to further improve the anti-attachment property of the surface on which the unevenness of the sheet is formed. In the present embodiment, the static friction coefficient 3 of the surface on which the unevenness is formed in the one medical packaging sheet described above refers to the surface of the layer containing the thermoplastic resin of the one medical packaging sheet on the other medical The above-described one of the medical packaging sheets was overlapped and measured by performing a friction test according to JIS K7125 using the one medical packaging sheet and the other medical packaging sheet. The static friction coefficient of the surface in which the unevenness | corrugation in the said medical packaging sheet is formed and the surface in which the unevenness | corrugation in the said other said medical packaging sheet was formed is pointed out.

  In addition, the medical packaging sheet according to the present embodiment may have a single-layer structure or a multilayer structure as long as the unevenness is formed on one surface. From the viewpoint of improving slipperiness, it is preferable to form a multilayer structure in which the outer layer formulation can be changed.

  Hereinafter, with respect to the material components forming the medical packaging sheet according to the present embodiment, the sheet is on the opposite side of the uneven layer having a surface with unevenness on the surface and the surface with the unevenness formed thereon. A description will be given by taking as an example the case of a two-layer structure including a non-concavo-convex layer that is located and has a surface on which irregularities are not formed.

  The material forming the surface of the uneven layer is preferably substantially free of additives from the viewpoint of enhancing the low elution property of the packaging material formed using the medical packaging sheet according to this embodiment. Examples of the additive according to this embodiment include lubricants such as erucic acid amide, higher fatty acid amide, and higher fatty acid ester, anti-blocking agents such as silica, diatomaceous earth, calcium carbonate, and talc, crosslinking agents, antioxidants, Examples include ultraviolet absorbers, light stabilizers, fillers, antistatic agents such as glycerin esters, sorbitan acid esters, and polyethylene glycol esters of fatty acids having 8 to 22 carbon atoms, dyes, and colorants.

  The material forming the surface of the non-recessed layer suppresses the adhesion of impurities from the surface of the non-recessed layer to the surface of the uneven layer when unwound from the original fabric, and the medical packaging according to this embodiment From the viewpoint of enhancing the low elution property of a packaging material formed using a sheet, it is preferable that the additive is not included, but an additive may be included as necessary.

  Moreover, the material which forms the surface of an uneven | corrugated layer, and the material which forms the surface of a non-uneven | corrugated layer are both linear low density from a viewpoint of improving four characteristics requested | required of the medical packaging sheet mentioned above. It is preferable to include a polyethylene resin.

  The surface of the concavo-convex layer uses a linear low density polyethylene resin, medium density polyethylene, high density polyethylene, and a metallocene catalyst from the viewpoint of increasing the sealing strength during heat sealing of the medical packaging sheet according to the present embodiment. Polymerized ethylene-α olefin polymer, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid Polyolefin resins such as acid methyl copolymer, ethylene-propylene copolymer, methyl pentene polymer, polybutene polymer, polyethylene or polypropylene are not suitable for acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, etc. Modified with saturated carboxylic acid Acid-modified polyolefin resins, polyvinyl acetate resins, it is preferably formed of a material containing a polyolefin-based resins such as poly (meth) acrylic resin.

  The surface of the non-concave layer is polymerized using a linear low density polyethylene resin, medium density polyethylene, high density polyethylene, and metallocene catalyst from the viewpoint of improving the sheet slipperiness of the medical packaging sheet according to this embodiment. Ethylene-α olefin polymer, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid Polyolefin resins such as methyl copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene are unsaturated such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid Acid modification modified with carboxylic acid Li olefin resins, polyvinyl acetate resins, poly (meth) material or polyamide comprises a polyolefin-based resin such as an acrylic resin, to be formed by a polyester resin preferred.

  Further, the surface of the concavo-convex layer and the surface of the non-concavo-convex layer may be formed using materials having the same composition, but are formed of at least different materials from the viewpoint of improving the slipperiness of the sheet. It is desirable that In addition, it is preferable that the material which forms the surface of a non-concavo-convex layer contains at least one of an antiblocking agent and a lubricant from the viewpoint of improving slipperiness.

<Method for producing medical packaging sheet>

The manufacturing method of the medical packaging sheet in this embodiment is different from the conventional manufacturing method, and it is necessary to highly control the manufacturing conditions of the uneven layer having at least the surface on which the unevenness is formed. . That is, for the first time by a manufacturing method that highly controls various factors related to the following two conditions, the arithmetic average roughness (Ra) of the surface on which the unevenness per unit sheet thickness is formed, the value of Ra / T, It is possible to obtain a medical packaging sheet in which the unevenness average interval (Rsm) and Rsm / T on the surface where the unevenness per unit sheet thickness is formed satisfy the specific conditions described above.
(1) Selection of resin material for forming uneven layer (2) Method for forming uneven surface

  Hereinafter, an example of the manufacturing method of the medical packaging sheet which concerns on this embodiment is demonstrated. However, the manufacturing method of the medical packaging sheet of this embodiment is not limited to the following examples. Moreover, an example of the manufacturing method of the medical packaging sheet of this embodiment is later mentioned concretely in an Example.

(1) Selection of resin material for forming uneven layer

  In order to realize the medical packaging sheet having anti-interbonding properties according to the present embodiment, it is necessary to select an appropriate resin material in accordance with the formation conditions of the unevenness described later. Specifically, in order to realize the medical packaging sheet according to the present embodiment, the resin material for forming the concavo-convex layer, the type of resin, compounding composition, density, and curing in accordance with the concavo-convex formation conditions described later. It is necessary to combine each factor such as the state appropriately.

  Next, (2) conditions for forming irregularities will be described.

  In order to obtain the medical packaging sheet in the present embodiment, it is necessary to adopt conditions suitable for the resin material for forming the uneven layer and the non-recessed layer selected as described in (1) above. Specifically, the embossing roll cooling conditions when embossing the sheet, the unevenness formed on the surface of the embossing roll used for embossing, etc. are highly controlled and combined in particular. It becomes important. In addition, as a method for producing a medical packaging sheet in the present embodiment, if the above-described factors can be combined with high control, even if the film is formed by the inflation method, the film is formed by the T-die method. However, from the viewpoint of excellent sheet productivity, sheet thickness control, and surface unevenness control, it is preferable to employ a method of forming a film by the T-die method.

  Hereinafter, an example of the manufacturing method of the medical packaging sheet which concerns on this embodiment is shown. However, the manufacturing method of the medical packaging sheet of this embodiment is not limited to the following examples.

  The method for producing a medical packaging sheet described below is a method for producing a packaging sheet 30 (FIG. 2) used to form the packaging material 11 (FIG. 3) for packaging the contents 20 for medical use.

As shown in FIG. 1, this manufacturing method includes a step of forming a multi-layer or single-layer packaging sheet 30 using a T-die 40, and a cooling roll that is a roll that engages with the packaging sheet 30 in the uppermost stream. 50, cooling the packaging sheet 30.
The material which comprises the layer (inner layer 31) containing the one surface 30a of the packaging sheet 30 does not contain the additive substantially.
Irregularities are formed on the surface of the cooling roll 50.
In the process of cooling the packaging sheet 30, the layer (inner layer 31) including the one surface 30 a of the packaging sheet 30 is subjected to uneven processing (embossing) by the cooling roll 50.
By subjecting the layer (inner layer 31) including the one surface 30a of the packaging sheet 30 to uneven processing, the slipperiness of the surface of the layer can be improved.

  The packaging sheet 30 is a medical packaging sheet used to form a packaging material for packaging the contents 20 for medical use. In addition, the packaging material wraps the content 20 in a state in direct contact with the content 20.

  As shown in FIGS. 2 and 3, the packaging sheet 30 can have a two-layer structure including an inner layer 31 and an outer layer 32, for example.

The packaging material 11 contains the contents 20 by partially bonding the inner layers 31 by heat sealing so that the inner layer 31 is on the inner side and the outer layer 32 is on the outer side, thereby forming the seal portion 11a. 12 is processed.
The packaging material 11 is provided with a conduit 14 for discharging the contents 20 from the accommodating portion 12 and a plug 15 for opening and closing the tip of the conduit 14 as necessary.
Moreover, the sealing part 11a is provided with a suspending hole 13 for suspending the packaging material 11 and eventually the infusion bag 10 as necessary.

  The manufacturing apparatus 100 shown in FIG. 1 is related to the packaging sheet 30 between the T-die 40, the cooling roll 50, the winding roll 110 that winds up the original roll 90, and the cooling roll 50 and the winding roll 110. And a plurality of rolls 60, 70, 80 to be combined.

  The T die 40 is formed with a first introduction port 41 a into which the material constituting the outer layer 32 is introduced and a second introduction port 41 b into which the material constituting the inner layer 31 is introduced.

The manufacturing apparatus 100 includes a first extruder (not shown) that melts and kneads and extrudes the material constituting the outer layer 32 and a second extruder (not shown) that melts and kneads and extrudes the material that constitutes the inner layer 31. ) And. The material extruded from the first extruder is introduced into the first introduction port 41a, and the material extruded from the second extruder is introduced into the second introduction port 41b.
The T die 40 further has a first flow path 42a communicating with the first introduction port 41a and a second flow path 42b communicating with the second introduction port 41b.

  The first flow path 42a causes the material constituting the outer layer 32 to flow downstream while spreading it into a sheet shape (film shape). The second flow path 42b allows the material constituting the inner layer 31 to flow downstream while expanding the material into a sheet shape (film shape).

  Further, a merge channel 43 is formed in the T die 40. The upstream end of the merging channel 43 is connected to the downstream end of the first channel 42a and the downstream end of the second channel 42b.

  When the first flow path 42a and the second flow path 42b merge into one merge flow path 43, the material constituting the outer layer 32 expanded by the first flow path 42a and the second flow path 42b expand the material. The materials constituting the inner layer 31 are stacked on each other.

The merging channel 43 is formed by laminating a material constituting the outer layer 32 expanded by the first channel 42a and a material constituting the inner layer 31 expanded by the second channel 42b on the downstream side. To flow.
The downstream end of the merging channel 43 is a discharge port 44 that discharges the packaging sheet 30 to the outside of the die 40.
From the discharge port 44, the packaging sheet 30 in which the outer layer 32 and the inner layer 31 are laminated is discharged.

  This figure shows a two-layer multi-manifold die as an example, but using a die that is laminated in two or more layers, the same resin is poured from multiple extruders into two layers. Also good. Moreover, you may make it 3 or more layers using 3 or more types of different resin. Furthermore, a method of forming a multilayer sheet using a feed block may be used.

The cooling roll 50 is a roll that engages the packaging sheet 30 discharged from the T die 40 in the most upstream (first engagement) and cools the packaging sheet 30.
The surface of the inner layer 31 is engaged with the cooling roll 50.

  Irregularities are formed on the surface of the cooling roll 50. Therefore, when the packaging sheet 30 is cooled by the cooling roll 50, the unevenness on the surface of the cooling roll 50 is transferred to the surface of the inner layer 31, so that the unevenness is formed on the surface of the inner layer 31.

The packaging sheet 30 cooled by the cooling roll 50 and having irregularities formed on the surface thereof is subsequently wound around the winding roll 110 after sequentially engaging with the plurality of rolls 60, 70, 80.
When the packaging sheet 30 is wound around the winding roll 110, an original fabric roll 90 obtained by winding the original sheet of the packaging sheet into a roll is obtained.

  Here, the temperature of the cooling roll 50 is, for example, a temperature that is 150 ° C. or more lower than the melting temperature of the material constituting the inner layer 31 (the layer including the one surface 30a of the packaging sheet 30) (the melting temperature −150 ° C. or less). More preferably, it is preferable to set the temperature 180 ° C. or more lower than the melting temperature (the melting temperature −180 ° C. or less).

  By doing in this way, sufficient cooling of the packaging sheet 30 and formation of irregularities of a desired shape can be performed, and the packaging sheet for the cooling roll 50 and the subsequent rolls 60, 70, 80. 30 adhesion can be suppressed. And blocking at the time of unwinding of the wound packaging sheet 30 can also be suppressed.

  Further, by setting the temperature of the cooling roll 50 sufficiently low in this way, the transparency of the packaging sheet 30 can be ensured even when the packaging sheet 30 is subjected to uneven processing (embossing).

  Here, preferably, the portion of the packaging sheet 30 that is engaged with the cooling roll 50 is urged against the cooling roll 50 by an air knife instead of a roll that sandwiches the packaging sheet 30 together with the cooling roll 50. . Thus, by energizing the packaging sheet 30 with respect to the cooling roll 50 with air, the surface roughness of the packaging sheet 30 is prevented from becoming too large, and the transparency of the packaging sheet 30 is improved. In addition, it is possible to provide the packaging sheet 30 with an uneven surface processing having a required surface roughness.

  In addition, it is preferable that the temperature of the cooling roll 50 is 15 degreeC or more, and it is still more preferable that it is 20 degreeC or more. By doing in this way, since the packaging sheet 30 can be stably engaged with the cooling roll 50 at the time of film formation, and the packaging sheet 30 can be stably formed into a film, the thickness of the packaging sheet 30 varies. Can be suppressed.

<Medical packaging material>

  The medical packaging material which concerns on this embodiment is formed with the said medical packaging sheet. By doing so, it is possible to realize a medical packaging material that satisfies the four technical levels described above and has a good yield and good quality.

  As shown in FIG. 3, the medical packaging material according to the present embodiment can be used as an infusion bag, for example. Specifically, FIG. 3 shows a medical liquid (saline solution, glucose solution, Ringer's solution, etc.) as the contents 20 on the packaging material 11 manufactured using the packaging sheet 30 which is a medical packaging sheet. An infusion bag 10 containing an infusion preparation used as an infusion at the site, a liquid such as a blood component used at the time of transfusion at the medical site, etc. is shown.

  As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above are also employable.

  Hereinafter, although an example and a comparative example explain the present invention, the present invention is not limited to these.

<Example 1>
Using a linear low-density polyethylene resin (LLDPE) (UBE Maruzen Polyethylene Co., Ltd., 125FN), a single-layer sheet having a thickness of 250 μm was formed by an extrusion T-die method. The obtained single-layer sheet was processed so as to be in a sheet original fabric state by a winding device. In the extrusion T-die method described above, an extrusion T-die apparatus in which a cooling roll was replaced with a single-sided embossing cooling roll was used. Moreover, the said single-sided embossing cooling roll was controlled and used so that it might become 30 degreeC with cooling water at the time of film-forming.

<Example 2>
The linear low density polyethylene resin (LLDPE) used in Example 1 is used as an inner layer, and a blend layer of the linear low density polyethylene resin and the low density polyethylene resin (F222NH, manufactured by Ube Maruzen Polyethylene Co., Ltd.) is provided on the outer layer. A sheet was produced in the same manner as in Example 1 except that the points were laminated.

<Comparative Example 1>
A sheet was produced in the same manner as in Example 1 except that the cooling roll in the extrusion T-die apparatus was changed to a mirror roll.

<Comparative example 2>
A sheet was produced in the same manner as in Example 1 except that the sheet was formed not by the extrusion T-die method but by the inflation method.

  The following evaluation was performed using the medical packaging sheet obtained by the Example and the comparative example. The results are shown in Table 1.

<Evaluation>

Arithmetic average roughness (Ra): The surface of the uneven layer of the sheet was measured for the center n = 3 using “Handy Surf E-35B manufactured by Tokyo Seimitsu Co., Ltd.” according to JIS B0601 (1994). The unit was μm.

-Average unevenness (Rsm): The surface of the uneven layer of the sheet was measured for the center n = 3 using "Tokyo Seimitsu Handy Surf E-35B" according to JIS B0601 (1994). The unit was μm.

-Maximum protrusion height (Rp): The surface of the concavo-convex layer of the sheet was measured for the center n = 3 using "Handy Surf E-35B manufactured by Tokyo Seimitsu Co., Ltd." according to JIS B0601 (1994). The unit was μm.

-Film slipperiness: The above-mentioned one medical packaging sheet is formed by superimposing the surface of one medical packaging sheet on which the projections and depressions are formed on the opposite side of the surface on which the projections and depressions of the other medical packaging sheet are formed. And the other medical packaging sheet, the coefficient of static friction of the surface of the medical packaging sheet on which the irregularities were formed was measured by a friction test according to JIS K7125. About the obtained measurement result, the medical packaging sheet obtained by the Example and the comparative example was evaluated according to the following evaluation criteria. If the surface of the medical packaging sheet is not uneven, the surface opposite to the one surface of the other medical packaging sheet is overlaid on one surface of the medical packaging sheet. A friction test is also performed.
A: The value of the coefficient of static friction is 0.1 or more and 1.3 or less. ○: The value of the coefficient of static friction is greater than 1.3 and 2.0 or less. X: The value of the coefficient of static friction is greater than 2.0.

-Sealing property: The surface of the medical packaging sheet having the irregularities formed thereon is overlapped with the surface of the other medical packaging sheet having the irregularities formed thereon. Using a hot plate lowering type sealing machine, a load of 0.3 MPa was applied to the packaging sheet at 200 ° C. for 3 seconds to prepare a seal sample. Next, the obtained seal sample was cut into a strip shape having a width of 15 mm to prepare a test piece. The test piece was peeled off at a rate of 100 mm / min with a tensile / compression tester (manufactured by A & D) and the maximum load was measured. The unit was N / 15 mm.

-Impact resistance: Based on JIS K7160 (A method), the tensile impact strength of the obtained medical packaging sheet was measured. The unit was kJ / m ² .

-External haze: About the medical packaging sheet, the haze value was measured using the haze meter (Nippon Denshoku Industries Co., Ltd. make, NDH-2000). In addition, the measurement of a haze value implemented the measurement from the surface side on the opposite side to the surface in which the unevenness | corrugation of the medical packaging sheet was formed. The unit is%.

Internal haze: A sheet sample in a state where a transparent tape was applied to both sides of the medical packaging sheet to eliminate the influence of the unevenness formed on the surface of the sheet was produced. About the obtained sheet | seat sample, the haze value was measured using the haze meter (The Nippon Denshoku Industries Co., Ltd. make, NDH-2000). The unit is%.

Coefficient of static friction: The above-mentioned one medical packaging sheet is formed by superimposing the surface of the other medical packaging sheet on which the irregularities are formed on the surface on which the irregularities of one medical packaging sheet are formed. And the other medical packaging sheet, the static friction coefficient in which the unevenness in the one medical packaging sheet was formed was measured by performing a friction test according to JIS K7125. If the surface of the medical packaging sheet is not uneven, the surface opposite to the one surface of the other medical packaging sheet is overlaid on one surface of the medical packaging sheet. A friction test is also performed.

  The sheets of Examples 1 and 2 were all excellent in mutual adhesion prevention, whereas the sheets of Comparative Examples 1 and 2 were insufficient in terms of mutual adhesion prevention. .

DESCRIPTION OF SYMBOLS 10 Infusion bag 11 Packaging material 11a Seal part 12 Storage part 13 Hanging hole 14 Conduit 15 Plug 20 Content liquid (contents)
30 Packaging sheet 30a One surface 31 Inner layer 32 Outer layer 40 T die 41a First introduction port 41b Second introduction port 42a First flow channel 42b Second flow channel 43 Merge flow channel 44 Discharge port 50 Cooling roll 60 Roll 70 Roll 80 Roll 90 Raw roll 100 Manufacturing apparatus 110 Winding roll

Claims (8)

A medical packaging sheet used to form a packaging material for medical use contents,
A plurality of irregularities are formed on one surface of the medical packaging sheet,
When the thickness of the medical packaging sheet is T,
The value of the arithmetic mean roughness (Ra) of the one surface on which the unevenness per unit sheet thickness is formed, Ra / T is 4 × 10 ⁻⁴ or more and 2 × 10 ⁻² or less, and the unit The medical packaging sheet whose Rsm / T value of the uneven | corrugated average space | interval (Rsm) of said one surface in which the said unevenness | corrugation per sheet thickness is formed is 0.4 or more and 4.5 or less. When the thickness of the medical packaging sheet is T,
The value of the maximum protrusion height (Rp) of the one surface on which the unevenness per unit sheet thickness is formed, Rp / T is 1.1 × 10 ⁻³ or more and 2 × 10 ⁻² or less, The medical packaging sheet according to claim 1.   The medical packaging sheet according to claim 1 or 2, wherein the material forming the one surface on which the unevenness is formed contains a linear low-density polyethylene resin.   The medical packaging sheet according to any one of claims 1 to 3, wherein the medical packaging sheet has a multilayer structure.   The medical packaging sheet as described in any one of Claims 1 thru | or 4 with which the material which forms the surface on the opposite side to said one surface in which the said unevenness | corrugation is formed contains a linear low density polyethylene resin. .   The medical packaging sheet according to any one of claims 1 to 5, wherein a material forming the one surface on which the unevenness is formed does not substantially contain an additive.   The medical packaging material formed with the medical packaging sheet as described in any one of Claims 1 thru | or 6.   The medical packaging material according to claim 7, wherein the content is a liquid.

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