JPWO2020170998A1 - Earplugs and earplug manufacturing methods - Google Patents
Earplugs and earplug manufacturing methods Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000002994 raw material Substances 0.000 claims abstract description 34
- 239000003242 anti bacterial agent Substances 0.000 claims abstract description 31
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims abstract description 6
- 239000004088 foaming agent Substances 0.000 claims abstract description 5
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 12
- 210000000613 ear canal Anatomy 0.000 claims description 11
- 239000006260 foam Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 claims 4
- 229910052810 boron oxide Inorganic materials 0.000 claims 2
- 229910001923 silver oxide Inorganic materials 0.000 claims 2
- 229910001948 sodium oxide Inorganic materials 0.000 claims 2
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 17
- 238000010586 diagram Methods 0.000 abstract 1
- 229920002635 polyurethane Polymers 0.000 abstract 1
- 239000004814 polyurethane Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 229920000915 polyvinyl chloride Polymers 0.000 description 5
- 239000004800 polyvinyl chloride Substances 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241000588724 Escherichia coli Species 0.000 description 2
- 241000191967 Staphylococcus aureus Species 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 208000012639 Balance disease Diseases 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- VFWRGKJLLYDFBY-UHFFFAOYSA-N silver;hydrate Chemical compound O.[Ag].[Ag] VFWRGKJLLYDFBY-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/08—Protective devices for the ears internal, e.g. earplugs
- A61F11/10—Protective devices for the ears internal, e.g. earplugs inflatable or expandable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Dentistry (AREA)
- Environmental Sciences (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Plant Pathology (AREA)
- Inorganic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Chemical & Material Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Veterinary Medicine (AREA)
- Acoustics & Sound (AREA)
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- Otolaryngology (AREA)
- Biomedical Technology (AREA)
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Abstract
抗菌性を有するポリウレタン製のスポンジタイプの耳栓を提供する。耳栓は、ウレタン樹脂原料と発泡剤とを含む耳栓原料を調製する原料調製工程Ｐ１と、耳栓原料と無機系抗菌剤とを混合する混合工程Ｐ２と、混合物を金型に注入して耳栓形状に成型し硬化させる成型・硬化工程Ｐ３と、成型物である耳栓を金型から脱型する脱型工程Ｐ４と、を経ることにより製造される。原料調製工程Ｐ１は、耳栓の形状復元所要時間が４０〜１２０秒になるように耳栓原料を調製する工程である。形状復元所要時間は、耳栓を指で略限界まで圧縮した状態でその圧縮を瞬時に完全に解除した時点から耳栓が元の形状に復元するまでの所要時間である。【選択図】図１Provided is a polyurethane sponge type earplug having antibacterial properties. For earplugs, a raw material preparation step P1 for preparing earplug raw materials containing a urethane resin raw material and a foaming agent, a mixing step P2 for mixing earplug raw materials and an inorganic antibacterial agent, and a mixture are injected into a mold. It is manufactured by going through a molding / curing step P3 of molding and hardening into an earplug shape, and a demolding step P4 of removing the molded earplug from the mold. The raw material preparation step P1 is a step of preparing earplug raw materials so that the time required to restore the shape of the earplugs is 40 to 120 seconds. The shape restoration time is the time required for the earplugs to be restored to their original shape from the time when the earplugs are compressed to almost the limit with a finger and the compression is instantly and completely released. [Selection diagram] Fig. 1
Description
本発明は、抗菌性能を有する防音用の耳栓及びその製造方法に関する。 The present invention relates to soundproof earplugs having antibacterial activity and a method for producing the same.
大音量の騒音は人の聴覚機能の低下を招く原因の一つである。また、騒音が原因となって、平衡障害、精神不安定、思考力・記憶力の低下といった症状が生じることもある。そのため、所定の騒音レベルを超える作業場においては、防音保護具を使用することが求められる。防音保護具として、一般に、耳栓が多く使用される。耳栓には、フランジタイプの固形耳栓とスポンジタイプの耳栓とがある。スポンジタイプの耳栓には、ウレタンフォーム製のものとＰＶＣ（Ｐｏｌｙｖｉｎｙｌ Ｃｈｌｏｒｉｄｅ）製のもとがある。 Loud noise is one of the causes of deterioration of human hearing function. In addition, noise may cause symptoms such as balance disorder, mental instability, and deterioration of thinking and memory. Therefore, it is required to use soundproof protective equipment in a workplace where the noise level exceeds a predetermined level. Earplugs are commonly used as soundproof protective equipment. There are two types of earplugs: flange type solid earplugs and sponge type earplugs. There are two types of sponge type earplugs, one made of urethane foam and the other made of PVC (Polyvinyl Chloride).
エラストマーやシリコーンなどからなるフランジタイプの耳栓やＰＶＣ製のスポンジタイプの耳栓は、吸水性が低いため洗って再使用できる。また、フランジタイプの耳栓やＰＶＣ製のスポンジタイプの耳栓には抗菌性を有するものがある（特許文献１参照）。 Flange-type earplugs made of elastomer or silicone and sponge-type earplugs made of PVC have low water absorption and can be washed and reused. Further, some flange type earplugs and PVC sponge type earplugs have antibacterial properties (see Patent Document 1).
これに対し、弾性発泡ポリマ又はウレタンからなるスポンジタイプの耳栓は、水分を含むと乾燥し難いため、洗って再利用することはできないとされている。特に、ウレタンからなるスポンジタイプの耳栓は、水分を含むと加水分解反応を起こして短時間で劣化してしまうため洗浄不可能である。 On the other hand, sponge-type earplugs made of elastic foam polymer or urethane are difficult to dry when they contain water, so they cannot be washed and reused. In particular, sponge-type earplugs made of urethane cannot be washed because they undergo a hydrolysis reaction and deteriorate in a short time when they contain water.
このように、フランジタイプの耳栓やＰＶＣ製のスポンジタイプの耳栓は、洗って再利用できるため衛生的な使用が可能であり、この点においては、弾性発泡ポリマ又はウレタンからなるスポンジタイプの耳栓よりも優れているといえる。 As described above, flange type earplugs and PVC sponge type earplugs can be washed and reused for hygienic use. In this respect, sponge type earplugs made of elastic foam polymer or urethane can be used. It can be said that it is superior to earplugs.
一方、スポンジタイプの耳栓は、柔軟性と形状復元性とを併せ持つため、外耳道を隙間なく塞ぐことができ、フランジタイプの耳栓よりも高い遮音性を発揮し得る。このため、騒音から耳を保護するという耳栓本来の機能において、スポンジタイプの耳栓はフランジタイプの耳栓よりも優れているといえる。 On the other hand, since the sponge type earplugs have both flexibility and shape restoration, they can close the ear canal without gaps and can exhibit higher sound insulation than the flange type earplugs. Therefore, it can be said that the sponge type earplugs are superior to the flange type earplugs in the original function of the earplugs to protect the ears from noise.
しかし、ウレタンフォーム製のスポンジタイプの耳栓は、指で圧縮してから外耳道に挿入する必要があるため、指を介してばい菌が付着しやすく、しかも、洗うことができないため、ばい菌が残存し大量に繁殖しやすい。それにもかかわらず、抗菌性を有するウレタンフォーム製のスポンジタイプの耳栓は実現されていなかった。 However, since urethane foam sponge type earplugs need to be compressed with a finger and then inserted into the ear canal, germs easily adhere to the ear canal through the fingers and cannot be washed, so that germs remain. Easy to breed in large numbers. Nevertheless, sponge-type earplugs made of urethane foam having antibacterial properties have not been realized.
本発明は、抗菌性を有するウレタンフォーム製のスポンジタイプの耳栓及びその製造方法を提供することを目的とする。 An object of the present invention is to provide a sponge-type earplug made of urethane foam having antibacterial properties and a method for producing the same.
本発明に係る耳栓は、指で圧縮しながら外耳道に挿入される耳栓であって、無機系抗菌剤を分散含有した軟質ウレタンフォームからなり、且つ、指で略限界まで圧縮した状態でその圧縮を瞬時に完全に解除した時点から元の形状に復元するまでの所要時間が４０秒〜１２０秒であることを特徴とする。 The earplug according to the present invention is an earplug that is inserted into the ear canal while being compressed by a finger, is made of a soft urethane foam containing an inorganic antibacterial agent dispersedly, and is compressed to a substantially limit by a finger. It is characterized in that the time required from the time when the compression is completely released instantly to the restoration to the original shape is 40 seconds to 120 seconds.
本発明に係る耳栓の製造方法は、ウレタン樹脂原料と発泡剤とを含む耳栓原料を調製する原料調製工程と、前記原料調製工程を経ることにより得られた耳栓原料と無機系抗菌剤とを混合する混合工程と、前記混合工程を経ることにより得られた混合物を金型に注入して耳栓形状に成型し硬化させる成型・硬化工程と、前記成型・硬化工程を経ることにより得られた成型物を前記金型から脱型する脱型工程と、を含み、前記原料調製工程は、前記成型物の形状復元所要時間が４０秒〜１２０秒になるように前記耳栓原料を調製する工程であり、前記形状復元所要時間は、前記成型物を指で略限界まで圧縮した状態でその圧縮を瞬時に完全に解除した時点から前記成型物が元の形状に復元するまでの所要時間であることを特徴とする。 The method for producing an earplug according to the present invention includes a raw material preparation step for preparing an earplug raw material containing a urethane resin raw material and a foaming agent, and an earplug raw material and an inorganic antibacterial agent obtained through the raw material preparation step. A mixing step of mixing the above, a molding / curing step of injecting the mixture obtained through the mixing step into a mold, molding into an earplug shape, and curing, and a molding / curing step obtained by undergoing the molding / curing step. The raw material preparation step includes a demolding step of removing the molded product from the mold, and the raw material preparation step prepares the earplug raw material so that the time required for shape restoration of the molded product is 40 seconds to 120 seconds. The shape restoration required time is the time required from the time when the molded product is compressed to almost the limit with a finger and the compression is instantly completely released until the molded product is restored to the original shape. It is characterized by being.
本発明によれば、抗菌性を有するウレタンフォーム製のスポンジタイプの耳栓及びその製造方法を提供することができる。 According to the present invention, it is possible to provide a sponge-type earplug made of urethane foam having antibacterial properties and a method for producing the same.
以下、本発明の一実施形態について詳細に説明する。 Hereinafter, one embodiment of the present invention will be described in detail.
［耳栓の構成］
まず、本発明に係る耳栓の一実施形態について説明する。
ここでは、一実施形態として、下記要件（Ａ）〜（Ｄ）をすべて満たす耳栓を例示する。
（Ａ） 指で圧縮しながら外耳道に挿入される軟質ウレタンフォームからなる耳栓である。
（Ｂ） 指で略限界まで圧縮した状態でその圧縮を瞬時に完全に解除した時点から元の形状に復元するまでの所要時間（形状復元所要時間）が４０秒〜１２０秒である。「略限界まで圧縮した状態」とは、例えば、自然状態で直径８ｍｍ〜１３ｍｍ程度の略円柱形であったものを直径５ｍｍ〜６ｍｍ程度の略円柱形になるように圧縮した状態をいう。
（Ｃ） 無機系抗菌剤を０．０５重量%〜２重量%分散含有している。
（Ｄ） （Ｃ）の無機系抗菌剤は表１の内容で特定される粉末状の銀系無機抗菌剤である。[Composition of earplugs]
First, an embodiment of earplugs according to the present invention will be described.
Here, as an embodiment, earplugs satisfying all of the following requirements (A) to (D) will be illustrated.
(A) Earplugs made of soft urethane foam that are inserted into the ear canal while being compressed with a finger.
(B) The time required to restore the original shape (shape restoration required time) from the time when the compression is instantly completely released in the state of being compressed to the approximate limit with a finger is 40 seconds to 120 seconds. The "state compressed to a substantially limit" means, for example, a state in which a substantially cylindrical shape having a diameter of about 8 mm to 13 mm in a natural state is compressed into a substantially cylindrical shape having a diameter of about 5 mm to 6 mm.
(C) Inorganic antibacterial agent is dispersed and contained in an amount of 0.05% by weight to 2% by weight.
(D) The inorganic antibacterial agent of (C) is a powdery silver-based inorganic antibacterial agent specified in the contents of Table 1.
上記要件（Ａ）〜（Ｄ）をすべて満たすことにより、一実施形態として例示された耳栓は、下記の有利な効果（Ｉ）及び（ＩＩ）を奏する。
（Ｉ） 上記要件（Ａ）及び（Ｂ）により、外耳道への装着性及び騷音遮断性が良好である。
（ＩＩ） 上記要件（Ｃ）及び（Ｄ）により、十分な抗菌性を有する。By satisfying all of the above requirements (A) to (D), the earplugs exemplified as one embodiment exhibit the following advantageous effects (I) and (II).
(I) Due to the above requirements (A) and (B), the wearability to the ear canal and the noise blocking property are good.
(II) It has sufficient antibacterial properties according to the above requirements (C) and (D).
一実施形態の耳栓には、その形状によって吊り鐘型、弾丸型、円柱型、等に分類されるものが含まれる。また、一実施形態の耳栓には、グリップが付いていてそのまま外耳道に挿入されるタイプの耳栓、ヘッドバンド等に取り付けられるセミインサートと呼ばれるタイプの耳栓が含まれる。 The earplugs of one embodiment include those classified into a hanging bell type, a bullet type, a cylindrical type, and the like according to their shapes. Further, the earplugs of one embodiment include earplugs of a type having a grip and being inserted into the ear canal as they are, and earplugs of a type called a semi-insert attached to a headband or the like.
［耳栓の製造方法］
次に、本発明に係る耳栓の製造方法の一実施形態について説明する。
図１に示すように、一実施形態の耳栓の製造方法は、原料調製工程Ｐ１と、混合工程Ｐ２と、成型・硬化工程Ｐ３と、脱型工程Ｐ４と、を含む。[Manufacturing method of earplugs]
Next, an embodiment of the method for manufacturing earplugs according to the present invention will be described.
As shown in FIG. 1, the method for producing earplugs of one embodiment includes a raw material preparation step P1, a mixing step P2, a molding / curing step P3, and a demolding step P4.
原料調製工程Ｐ１は、ウレタン樹脂原料すなわちポリオール及びポリイソシアネートを主成分とし、これに副成分として発泡剤、整泡剤、触媒、着色剤等を混合した耳栓原料を調製する工程である。 The raw material preparation step P1 is a step of preparing an earplug raw material in which a urethane resin raw material, that is, a polyol and a polyisocyanate is used as a main component, and a foaming agent, a defoaming agent, a catalyst, a coloring agent and the like are mixed with the main component.
ウレタン樹脂原料であるポリオール及びポリイソシアネートの分量、並びに耳栓原料における発泡剤など副成分の含有量、等は、最終的に得られる成型物である耳栓の形状復元所要時間が４０秒〜１２０秒になるように調整される。形状復元所要時間が４０秒未満であると、耳栓を圧縮してから外耳道に挿入するまでの間にその耳栓が元の形状に復元してしまう可能性が高くなるため、耳栓を外耳道に装着し難くなる。この問題は、耳栓の装着教育を受けていない人の場合に顕著である。形状復元所要時間が１２０秒を超えると、耳栓の装着教育を受けていない人であっても、耳栓を外耳道に挿入し終えてからその耳栓が外耳道を密閉するまでに要する時間が長くなり過ぎることになる。このように、形状復元所要時間が４０秒〜１２０秒の範囲を外れると、本来の遮音性能を迅速に発揮し得る使い勝手の良い耳栓の実現が困難になる。 The amount of polyol and polyisocyanate, which are the raw materials for urethane resin, and the content of auxiliary components such as foaming agents in the raw material for earplugs, etc., determine the time required to restore the shape of the earplug, which is the final molded product, from 40 seconds to 120 seconds. Adjusted to seconds. If the time required to restore the shape is less than 40 seconds, there is a high possibility that the earplug will be restored to its original shape between the time the earplug is compressed and the time it is inserted into the ear canal. It becomes difficult to attach to. This problem is especially noticeable in people who are not educated in wearing earplugs. If the time required to restore the shape exceeds 120 seconds, it will take a long time for the earplugs to seal the ear canal after the earplugs have been inserted into the ear canal, even for those who have not been educated to wear earplugs. It will be too much. As described above, if the time required for shape restoration is out of the range of 40 seconds to 120 seconds, it becomes difficult to realize easy-to-use earplugs that can quickly exhibit the original sound insulation performance.
混合工程Ｐ２は、原料調製工程Ｐ１を経ることにより得られた耳栓原料と無機系抗菌剤とを混合する工程である。無機系抗菌剤は、表１の内容で特定される粉末状の銀系無機抗菌剤である。すなわち、無機系抗菌剤は、二酸化ケイ素（ＳｉＯ２）、酸化ホウ素（Ｂ２Ｏ３）、酸化ナトリウム（Ｎａ２Ｏ）及び酸化銀（Ａｇ２Ｏ）により組成され、平均粒径が１０μｍ、比重が２．５、１％懸濁液のｐHが８．８の銀系無機抗菌剤である。The mixing step P2 is a step of mixing the earplug raw material obtained through the raw material preparation step P1 with the inorganic antibacterial agent. The inorganic antibacterial agent is a powdery silver-based inorganic antibacterial agent specified in the contents of Table 1. That is, the inorganic antibacterial agent is composed of silicon dioxide (SiO 2 ), boron oxide (B 2 O 3 ), sodium oxide (Na 2 O) and silver oxide (Ag 2 O), and has an average particle size of 10 μm and a specific gravity. Is a silver-based inorganic antibacterial agent having a pH of 2.5 and a 1% suspension of 8.8.
耳栓原料及び無機系抗菌剤の総量に対する無機系抗菌剤の分量は０．０５重量%〜２重量%とする。無機系抗菌剤の分量が０．０５重量%未満であると、十分な抗菌性を有する耳栓の実現が困難になる。無機系抗菌剤の分量が２重量%を超えると、所望の装着性及び遮音性能を有する耳栓が得られなくなるとともに、抗菌剤を含有していることによる耳栓の変色が生じやすくなるため、耳栓の商品としての価値の低下を招くことになる。 The amount of the inorganic antibacterial agent to the total amount of the earplug raw material and the inorganic antibacterial agent shall be 0.05% by weight to 2% by weight. If the amount of the inorganic antibacterial agent is less than 0.05% by weight, it becomes difficult to realize earplugs having sufficient antibacterial properties. If the amount of the inorganic antibacterial agent exceeds 2% by weight, the earplugs having the desired wearability and sound insulation performance cannot be obtained, and the earplugs are likely to be discolored due to the inclusion of the antibacterial agent. This will reduce the value of earplugs as a commercial product.
成型・硬化工程Ｐ３は、混合工程Ｐ２を経ることにより得られた混合物を金型に注入して耳栓形状に成型し硬化させる工程である。この工程は、耳栓原料及び無機系抗菌剤の組成に応じた温度範囲及び時間で実施される。当該温度範囲及び時間は、所望の耳栓形状及び遮音性能を有する耳栓に成型可能な値に選定される。 The molding / curing step P3 is a step of injecting the mixture obtained through the mixing step P2 into a mold, molding it into an earplug shape, and curing it. This step is carried out in a temperature range and time according to the composition of the earplug raw material and the inorganic antibacterial agent. The temperature range and time are selected to values that can be molded into earplugs having a desired earplug shape and sound insulation performance.
脱型工程Ｐ４は、成型・硬化工程Ｐ３を経ることにより得られた成型物を金型から脱型する工程である。 The demolding step P4 is a step of demolding the molded product obtained through the molding / curing step P3 from the mold.
上記の製造方法により、上記要件（Ａ）〜（Ｄ）をすべて満たす耳栓が製造される。製造される耳栓の自由発泡密度は耳栓着用及び騷音遮断特性に適合した値となる。当該自由発泡密度の範囲は、例えば０．１３ｇ／ｃｃ〜０．１４ｇ／ｃｃである。 By the above manufacturing method, earplugs satisfying all the above requirements (A) to (D) are manufactured. The free foaming density of the manufactured earplugs is a value suitable for wearing earplugs and blocking noise. The range of the free foaming density is, for example, 0.13 g / cc to 0.14 g / cc.
［耳栓の抗菌性］
次に、一実施形態として例示された耳栓の抗菌性に関する試験結果について説明する。
無機系抗菌剤には、抗菌化研社製の銀系無機抗菌剤（ＢＩＯＳＵＲＥ ＳＧＩ）を使用した。試験は、ＪＩＳＬ１９０２に準拠する方法で実施した。
Next, the test results regarding the antibacterial property of the earplugs exemplified as one embodiment will be described.
As the inorganic antibacterial agent, a silver-based inorganic antibacterial agent (BIOSURE SGI) manufactured by Antibacterial Chemical Research Institute was used. The test was carried out by a method conforming to JIS L1902.
表２及び表３は、耳栓原料に無機系抗菌剤が０．０５重量％〜０．３重量％添加されたときの抗菌活性値を示すものである。表２は黄色ブドウ球菌に対する試験結果を示している。表３は大腸菌に対する試験結果を示している。 Tables 2 and 3 show the antibacterial activity values when an inorganic antibacterial agent is added to the earplug raw material in an amount of 0.05% by weight to 0.3% by weight. Table 2 shows the test results for Staphylococcus aureus. Table 3 shows the test results for E. coli.
黄色ブドウ球菌に対しては、無機系抗菌剤の添加率が０．０５重量％以上の場合に、抗菌活性値が２．２以上となり抗菌効果があることが確かめられた。大腸菌に対しては、さらに高い抗菌効果が確かめられた。また、無機系抗菌剤の添加率に略比例して抗菌効果が高くなることが確かめられた。 For Staphylococcus aureus, when the addition rate of the inorganic antibacterial agent was 0.05% by weight or more, the antibacterial activity value was 2.2 or more, and it was confirmed that there was an antibacterial effect. An even higher antibacterial effect was confirmed against E. coli. It was also confirmed that the antibacterial effect is increased in substantially proportional to the addition rate of the inorganic antibacterial agent.
以上説明したように、本実施形態によれば、抗菌性を有するウレタンフォーム製のスポンジタイプの耳栓及びその製造方法を実現することができる。 As described above, according to the present embodiment, it is possible to realize a sponge-type earplug made of urethane foam having antibacterial properties and a method for producing the same.
Ｐ１…原料調製工程、Ｐ２…混合工程、Ｐ３…成型・硬化工程、Ｐ４…脱型工程。 P1 ... Raw material preparation process, P2 ... Mixing process, P3 ... Molding / curing process, P4 ... Demolding process.
Claims (6)
前記原料調製工程を経ることにより得られた耳栓原料と無機系抗菌剤とを混合する混合工程と、
前記混合工程を経ることにより得られた混合物を金型に注入して耳栓形状に成型し硬化させる成型・硬化工程と、
前記成型・硬化工程を経ることにより得られた成型物を前記金型から脱型する脱型工程と、を含み、
前記原料調製工程は、前記成型物の形状復元所要時間が４０秒〜１２０秒になるように前記耳栓原料を調製する工程であり、
前記形状復元所要時間は、前記成型物を指で略限界まで圧縮した状態でその圧縮を瞬時に完全に解除した時点から前記成型物が元の形状に復元するまでの所要時間であることを特徴とする耳栓の製造方法。A raw material preparation process for preparing earplug raw materials containing a urethane resin raw material and a foaming agent,
A mixing step of mixing the earplug raw material obtained through the raw material preparation step and an inorganic antibacterial agent, and a mixing step.
A molding / curing step in which the mixture obtained through the mixing step is injected into a mold, molded into an earplug shape, and cured.
Including a demolding step of demolding a molded product obtained through the molding / curing step from the mold.
The raw material preparation step is a step of preparing the earplug raw material so that the time required for shape restoration of the molded product is 40 seconds to 120 seconds.
The shape restoration required time is a time required from the time when the molded product is compressed to a substantially limit with a finger and the compression is instantly completely released until the molded product is restored to the original shape. How to manufacture earplugs.
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