JP2009007034A - Lid material - Google Patents

Abstract

The present invention relates to a lid material excellent in easy peelability (easy-opening property). More specifically, the lid material is excellent in proper treatment with a gas for sterilization utilizing gas permeability and excellent sterilization after sterilization, and made of polyolefin resin. The purpose of this product is to provide a lid that can be easily peel-opened with little force even from a state where it is attached to the opening of a container, etc. .
A paper layer, a base film layer, and an easy peel layer are laminated in this order, and fine through holes are formed from the easy peel layer side, and the fine through holes form the base film layer. A lid material that penetrates and reaches the middle of the paper layer.
[Selection] Figure 1

Description

  The present invention relates to a lid material excellent in easy peelability (easy-opening property), and more specifically, excellent in treatment suitability with a gas for sterilization utilizing gas permeability and securing of a sterilized state after sterilization, and It is a lid material that can be easily peel-opened with little force even from a state where it is attached to an opening such as a container made of polyolefin resin, and that there is no concern that a part of the attachment will remain due to paper peeling. .

  Conventionally, as a lid material that can be easily peel-opened, a hot melt agent is applied on the side that comes into contact with a lid attachment part such as a flange at the periphery of the opening of the container, or a solvent-based heat seal lacquer is applied. And further laminated with an easy peel sealant film.

  On the other hand, for lids for containers containing medical instruments, etc., sterilization treatment is performed so that the opening of the container can be covered with the lid material and then sterilization can be performed with EOG (ethylene oxide gas) or γ rays. There are also those provided with gas permeability that allows volatile gas generated from the bonding resin part of the medical device to permeate by EOG or γ-ray sterilization. Since this type of lid material requires a certain gas permeability, it is difficult to provide an easy peel sealant film layer or the like for facilitating peel-opening, and peel-opening cannot be performed easily. There was often. On the other hand, if the gas permeability is excessively improved in order to improve the sterilization efficiency by EOG or the like, bacteria may easily enter the sterilized container, which may cause a problem.

  Therefore, as a cover material that achieves both sterilization treatment with sterilization gas using gas permeability and ensuring sterilization after sterilization, the paper itself has gas permeability and is suitable for sterilization treatment and sterilization. Paper that is guaranteed to be secured, for example, S-belan NF impregnated paper (manufactured by Tokushu Paper Industries Co., Ltd.) is often used which is coated with a polyolefin heat seal lacquer. With such a configuration, moderate gas permeability can be secured, and it is possible to ensure appropriate sterilization treatment with a sterilization gas using gas permeability and to secure a sterilized state after sterilization. When you try to peel it off the container, the cover material will be peeled off, and the removal part will not open completely, making it difficult to remove the stored item. (Paper) remained, users sometimes complained. Furthermore, there is a possibility that the contents that have been maintained in a sterilized state may be contaminated by being forced to remove the remaining paper-peeled portion again.

To prevent paper peeling, it is conceivable to use a film layer made of plastic instead of paper as the constituent material of the lid, but ensure the permeability of the gas used for sterilization It becomes impossible to do. It may be possible to perforate fine through-holes in a plastic film layer, etc. to give gas permeability, but the above-mentioned characteristics are ensured, that is, sterilization treatment with sterilization gas using gas permeability is appropriate. It was very difficult to satisfy both the sterilization state and the sterilization state after sterilization. Incidentally, although there is an easily openable lid material in which fine through holes are perforated (for example, see Patent Document 1), the fine through holes perforated in this lid material play a role of a trigger portion when piercing and breaking. The structure and role of the lid material of the present invention are completely different from those of the fine through hole.
JP-A-9-193304

  The present invention has been made to solve the problems of the prior art, and is excellent in sterilization treatment with sterilization gas using gas permeability and ensuring the sterilization state after sterilization, and for various users. An object of the present invention is to provide a lid material that can easily peel off the lid material without peeling off the paper even if it is peeled off.

  In order to solve the above problems, the invention according to claim 1 is characterized in that a paper layer, a base film layer, and an easy peel layer are laminated in this order, and fine through holes are perforated from the easy peel layer side. The fine through hole penetrates the base film layer and reaches the middle of the paper layer.

  According to a second aspect of the present invention, in the lid according to the first aspect, the fine through hole is drilled by any one of a drilling process using a diamond roll, a drilling process using a laser, or a half-cut process using a metal blade. It is characterized by being a thing drilled by these or the mixed process.

  Furthermore, the invention according to claim 3 is a test method using a B-type measuring instrument according to JIS P8117 in the lid material according to claim 1 or 2, and 30 seconds / 100 cc or more and 2000 seconds. / 100 cc or less.

  The lid material of the present invention has a structure in which a base film layer is laminated on a paper layer and an easy peel layer is further laminated on a base film, so that stable easy peel properties can be secured and peeling from an adherend At that time, paper peeling does not occur. In addition, the fine through-holes are perforated from the easy peel layer side to the middle of the paper layer via the base film, so that the gas sterilization treatment with gas sterilization gas is appropriate and the sterilization state after gas sterilization Both are excellent in securing.

  The best mode for carrying out the present invention will be specifically described below. FIG. 1 is an explanatory view showing a schematic cross-sectional configuration of a lid member of the present invention. As is apparent from the drawings, the cover material is formed by laminating a paper layer 1, a base film layer 2, and an easy peel layer 3 with adhesive layers 4 and 5, and countless fine from the easy peel layer 3 side. A through-hole is perforated, and the fine through-hole penetrates the base film layer 2 and reaches the middle of the paper layer 1. In the figure, reference numeral 6 denotes a fine through hole forming region in which an infinite number of fine through holes are formed.

  Moreover, FIG. 2 is explanatory drawing of the use condition of the cover material 7 of this invention. The container 8 contains a storage item 9 such as a medical instrument, and the lid member 7 of the present invention is attached to the flange portion at the periphery of the opening so as to cover the opening of the container 7. .

As the paper layer 1, the gas permeability to the sterilizing gas used for the sterilization treatment is ensured, and the stored item 9 is stored in the container 8 as shown in FIG. Fine paper, coated paper, impregnated paper and the like that can guarantee the sterilized state after the container 7 is sterilized with the sterilization gas after being covered are applicable. These basis weight some waist 30g / m ² ~100g / m ² about due to the need for desirable as a cover material.

  On the other hand, the base film layer 2 is a resin film layer made of a polyethylene terephthalate (PET) film, a nylon film, or a polypropylene film. These resin films are preferably stretched. Further, it is more preferable that the surface is subjected to easy adhesion treatment such as corona treatment.

  On the other hand, the easy peel layer 3 is made of a so-called easy peel film, a solvent-based lacquer coat layer, or the like, and is a layer for facilitating the peeling of the lid attached to the adherend. As the constituent material, an appropriate material may be selected and used depending on the material of the adherend and the peel strength. More specifically, an easy peel film or an easy peel agent having a thickness of about 15 μm to 50 μm in consideration of ensuring that fine through-holes can be drilled in the portion and giving stable peel strength. Any layer can be used.

The above-described adhesive layers 4 and 5 for laminating and laminating the paper layer 1, the base film layer 2, and the easy peel layer 3 are made of, for example, a two-component curable urethane adhesive, or low density polyethylene for extrusion lamination. It is a layer made of (LDPE), linear low density polyethylene (LLDPE), polypropylene (PP) or the like. When this adhesive layer is composed of a urethane-based adhesive, it may be formed with a dry coating amount of about 3 g to 7 g / m ² , and if it is formed by extrusion lamination using the above-mentioned extrusion lamination resin, the thickness is increased. What is necessary is just to form in 5 micrometers-about 30 micrometers.

  In a laminate in which a paper layer / (adhesive layer) / base film layer / (adhesive layer) / easy peel layer is laminated in this order, fine through-holes are drilled from the easy peel layer side by a diamond roll, by laser It is perforated by either drilling or half-cutting using a metal blade, or a mixed process thereof, and the fine through-hole penetrates the base film and reaches the middle of the paper layer. The air permeability of the lid member in which such fine through holes are perforated is preferably 30 seconds / 100 cc or more and 2000 seconds / 100 cc or less by a test method using a B-type measuring instrument in accordance with JIS P8117. . When the air permeability is less than 30 seconds / 100 cc, gas permeation is insufficient due to gas sterilization, and when it exceeds 2000 seconds / 100 cc, it is difficult to maintain sterility.

  Examples according to the present invention will be described below.

A cover material according to Example 1 was created in which the layer structure was a multilayer structure of paper layer / adhesive layer / base film layer / adhesive layer / easy peel layer. The constituent materials and configurations of each layer were as follows.
<Paper layer>
Pure white roll paper made by Nagoya Pulp Co., Ltd. "Golden (basis weight 35g / m ² )"
<Adhesive layer>
A 30% solid content, 3 μm thick layer <base film layer> made of an adhesive “A-525 / A-52” manufactured by Mitsui Takeda Chemical Co., Ltd.
Layer made of plastic film “E5200 (double-sided corona treatment, layer thickness 12 μm)” manufactured by Toyobo Co., Ltd. <Easy peel layer>
A layer composed of an easy peel film “CF 7601EH (layer thickness 30 μm)” manufactured by Toray Film Processing Co., Ltd.

  With respect to the laminated body having such a configuration, fine through holes were drilled by punching by pressing against a diamond roll from the easy peel layer side to the middle of the paper layer to obtain a lid according to Example 1.

  It was 1260 seconds when the air permeability of this cover material was measured by the test method using the B-type measuring device based on JISP8117.

A cover material according to Example 2 in which the layer configuration was a multilayer configuration of paper layer / adhesive layer / base film layer / adhesive layer / easy peel layer was prepared. The constituent materials and configurations of each layer were as follows.
<Paper layer>
Pure white roll paper made by Nagoya Pulp Co., Ltd. "Golden (basis weight 35g / m ² )"
<Adhesive layer>
A layer having a layer thickness of 15 μm composed of an adhesive “LC605Y” manufactured by Nippon Polyethylene Co., Ltd. <Base film layer>
Layer made of plastic film “E5200 (double-sided corona treatment, layer thickness 12 μm)” manufactured by Toyobo Co., Ltd. <Easy peel layer>
A layer composed of an easy peel film “CF 7601EH (layer thickness 30 μm)” manufactured by Toray Film Processing Co., Ltd.

  With respect to the laminated body having such a configuration, fine through holes were formed by drilling by pressing a diamond roll from the easy peel layer side to the middle of the paper layer, and the lid according to Example 2 was obtained.

  It was 1450 seconds when the air permeability of this cover material was measured by the test method using the B-type measuring device based on JIS P8117.

A lid material according to Example 3 in which the layer configuration was a multilayer configuration of paper layer / adhesive layer / base film layer / adhesive layer / easy peel layer was prepared. The constituent materials and configurations of each layer were as follows.
<Paper layer>
Pure white roll paper made by Nagoya Pulp Co., Ltd. "Golden (basis weight 35g / m ² )"
<Adhesive layer>
A 30% solid content, 3 μm thick layer <base film layer> made of an adhesive “A-525 / A-52” manufactured by Mitsui Takeda Chemical Co., Ltd.
Layer made of plastic film “ON-BCRT (double-sided corona treatment, layer thickness 15 μm)” manufactured by Unitika Ltd. <Easy peel layer>
A layer composed of an easy peel film “CF 7601EH (layer thickness 30 μm)” manufactured by Toray Film Processing Co., Ltd.

  With respect to the laminate having such a configuration, fine through holes were drilled by drilling with a diamond roll from the easy peel layer side to the middle of the paper layer, and the lid according to Example 3 was obtained.

  It was 1310 seconds when the air permeability of this cover material was measured by the test method using the B-type measuring device based on JIS P8117.

A lid material according to Example 4 for comparison in which the layer configuration is a multilayer configuration of paper layer / adhesive layer / easy peel layer was prepared. The constituent materials and configurations of each layer were as follows.
<Paper layer>
Pure white roll paper made by Nagoya Pulp Co., Ltd. "Golden (basis weight 35g / m ² )"
<Adhesive layer>
30% solid content consisting of an adhesive “A-525 / A-52” manufactured by Mitsui Takeda Chemical Co., Ltd.
3μm thick layer <easy peel layer>
A layer composed of an easy peel film “CF 7601EH (layer thickness 30 μm)” manufactured by Toray Film Processing Co., Ltd.

  With respect to the laminate having such a configuration, fine through holes were drilled by drilling with a diamond roll from the easy peel layer side to the middle of the paper layer, and the lid according to Example 4 was obtained.

  It was 510 seconds when the air permeability of this cover material was measured by the test method using the B-type measuring device based on JIS P8117.

A lid material according to Example 5 for comparison in which the layer configuration is a paper layer / easy peel layer configuration was prepared. The constituent materials and configurations of each layer were as follows.
<Paper layer>
Impregnated paper “S Belan NF (basis weight 95 g / m ² )” manufactured by Tokushu Paper Co., Ltd.
<Easy peel layer>
A layer having a dry coating amount of 5 g / m ² comprising a solvent-based lacquer coating agent “M750” manufactured by Dainippon Ink & Chemicals, Inc.

  The laminated body having such a configuration was used as a lid material according to Example 5.

  It was 800 seconds when the air permeability of this cover material was measured by the test method using the B-type measuring device based on JIS P8117.

After the lid according to each of the above examples is attached to the flange part of the periphery of the opening part by heat sealing under the following conditions so as to cover the opening part of the polypropylene-based molded container, paper peeling occurs after having the monitor evaluate the peeling. I counted the number. Table 1 shows the results of the number of paper peeling occurrences [number of occurrences / number of measurements].
<Heat seal conditions>
[Examples 1, 2, 3, 4]
Sealing temperature: 180 ° C. and 200 ° C., sealing time: 0.5 sec × 2 times, sealing pressure: 1.5 kgf / cm ²
[Example 5]
Sealing temperature: 230 ° C. and 250 ° C., sealing time: 0.5 sec × 2 times, sealing pressure: 1.5 kgf / cm ²

From the above results, the cover materials according to Examples 1, 2, and 3 have less occurrence of paper peeling than the cover materials according to Examples 4 and 5, and the use of an easy peel film allows the heat seal temperature. Can be set low. Comparing the lid materials according to Examples 1 and 2 and Example 4, it can be seen that the presence or absence of the base film is greatly related to the occurrence of paper peeling. Further, it was found that the substrate film can reduce the occurrence of paper peeling as much as possible, whether it is a PET film or a nylon film. It was also found that the effect of preventing the occurrence of paper peeling was the same whether the adhesive layer was provided by dry lamination or by extrusion lamination. Further, as can be understood from the comparison with the lid material according to Example 5, it can be seen that the lid material according to the present invention hardly causes paper peeling even if it is peeled in various ways.

It is explanatory drawing which shows the general | schematic cross-section structure of the cover material of this invention. It is explanatory drawing which shows the use condition of the cover material of this invention.

Explanation of symbols

1: Paper layer 2: Base film layer 3: Easy peel layer 4, 5: Adhesive layer 6: Fine through-hole forming region 7: Lid 8: Container 9: Storage

Claims (3)

  A paper layer, a base film layer, and an easy peel layer are laminated in this order, and fine through holes are perforated from the easy peel layer side, and the fine through holes penetrate through the base film layer. Cover material characterized by reaching to the middle.   The fine through holes are drilled by either diamond drilling, laser drilling, or half-cutting using a metal blade, or by a combination of these drilling. The lid material according to claim 1.   The lid material according to claim 1 or 2, wherein the air permeability is 30 seconds / 100cc or more and 2000 seconds / 100cc or less by a test method using a B-type measuring instrument conforming to JIS P8117.