GB2367525A - Moulded anatomical mask - Google Patents

Moulded anatomical mask Download PDF

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Publication number
GB2367525A
GB2367525A GB0120066A GB0120066A GB2367525A GB 2367525 A GB2367525 A GB 2367525A GB 0120066 A GB0120066 A GB 0120066A GB 0120066 A GB0120066 A GB 0120066A GB 2367525 A GB2367525 A GB 2367525A
Authority
GB
United Kingdom
Prior art keywords
mould
polymeric material
method
mask
periphery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0120066A
Other versions
GB0120066D0 (en
Inventor
Richard Banfield Hicks
Peter Jassell
Simon Payne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intersurgical Ltd
Original Assignee
Intersurgical Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intersurgical Ltd filed Critical Intersurgical Ltd
Priority to GB0120066A priority Critical patent/GB2367525A/en
Publication of GB0120066D0 publication Critical patent/GB0120066D0/en
Publication of GB2367525A publication Critical patent/GB2367525A/en
Priority claimed from PCT/GB2002/003565 external-priority patent/WO2003016018A1/en
Application status is Withdrawn legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/06Respiratory or anaesthetic masks
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02Masks
    • A62B18/025Halfmasks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0461Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
    • B29C44/0469Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other provided with physical separators between the different materials, e.g. separating layers, mould walls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1635Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B29C45/1639Removable partitions between adjacent mould cavity portions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1676Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/1704Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/48Wearing apparel
    • B29L2031/4807Headwear
    • B29L2031/4835Masks

Abstract

An anatomical mask (20) is manufactured by injection moulding a first polymer in a central region (11) of the mould 10, allowing it to cool and then injection moulding into an outer region (9) of the mould a second, elastomeric polymer containing a foaming agent. Once the second polymer has bonded to the periphery of the shell (13) formed by the first polymer the mould is opened allowing the second polymer to inflate to form a cushion (15). A tubular metal barrier member 6 is movable in a tubular slot 16 between a closed position (figure 2), in which region 11 is separated from region 9, and withdrawn position to allow bonding of the second polymer (thermoplastic elastomer) to the periphery of shell 13 (transparent polypropylene). Gas from c source other than the foaming agent may be introduced into the cushion material before the latter has solidified.

Description

"ANATOMICAL MASK" This invention relates to an improved anatomical mask and method of manufacturing the same. Examples of such masks are face masks designed to cover the nose and/or mouth which are used to supply e. g. a pilot, a diver, a firefighter or a hospital patient with a breathing gas mixture. A shell, usually transparent, incorporates at least one tubular orifice to which a gas supply line can be connected. Another type of anatomical mask is used to cover a tracheostomy, an opening in the neck into the trachea, so that a patient can be ventilated otherwise than through the nose and mouth.

Other examples of anatomical masks are swimming goggles, industrial dust masks and breathing apparatus, having a shell fitted either with a window or a filter. All of these masks have in common a central, concave component, which may be a relatively hard shell, around the periphery of which is a relatively soft cushion to form an air seal against a particular area of a human or animal body.

At present the central component or shell is made separately from the annular cushion, typically by injection moulding of a plastics material.

The cushion, which is to deform to follow the contours of the body, is made typically in a separate injection or blow moulding operation or by rotational casting. It may be a gas injected and/or chemically foamed polymer. Alternatively it may simply be a ring of rubber or other elastomeric polymer. After the two components have been made they must be bonded together. This is usually done by hand.

This three-stage manufacturing procedure is time consuming and labour intensive, which affects the cost of the finished article.

A principal object of the present invention is to speed up and reduce the cost of the manufacturing process, thereby considerably reducing the cost of the finished product while maintaining its quality.

In accordance with one aspect of the present invention there is provided a method of manufacturing an anatomical mask (as herein defined) which comprises forming or placing in a mould a central component of the mask comprising a first, relatively hard polymeric material and introducing into the mould a second relatively soft polymeric material containing a foaming agent to contact and bond to the periphery of the central component and opening the mould after the second polymeric material has formed a skin where it contacts the mould but before the second polymeric material has fully solidified whereby the second polymeric material will expand to form a cushion around the periphery of the central component.

Preferably the first polymeric material is transparent polypropylene and the second polymeric material is a thermoplastic elastomer.

Preferably the first polymeric material is allowed at least partially to solidify before exposure to the second polymeric material.

A removable barrier may be placed within the mould to define the periphery of a central area of the mould cavity, the first polymeric material being injected into said central area in a liquid state and allowed to solidify before removal of the barrier and injection into an outer area of the the mould cavity of the second polymeric material in a liquid state.

Methods of manufacturing components made from two or more polymers within the same tool are well known. The use of a removable barrier within the mould to define the periphery of a central area of the mould cavity and effect polymer separation is considered particularly suited to the manufacture of an anatomical mask. However polymer separation can be achieved by indexing parts of the tool after a moulding stage to expose a new cavity region to the moulded component. These manufacturing techniques are well understood in the industry and are therefore not described in more detail.

Gas from a source other than the foaming agent may be introduced into the cushion material before the latter has solidified. Gas may be introduced under pressure into the second polymeric material before its introduction into the mould.

In accordance with another aspect of the present invention there is provided apparatus for use in carrying out the method of the present invention, the apparatus comprising a mould having two parts separable across a cavity defined between the parts when the mould is closed, the cavity having a central, relatively thin area to form the central component of the mask and an outer relatively thicker area into which the second polymeric material will be injected, said two areas being separable by a removable barrier which, when present in the mould, defines the periphery of the central component of the mask.

The barrier may be tubular and may be movable into or out of the mould through a tubular slot in one of the mould parts.

A preferred embodiment of the present invention will now be described by way of non-limitative example with reference to the accompanying drawings, in which: Figure 1 illustrates an anaesthetic mask made in accordance with the present invention partially cut away to show internal detail, and Figures 2-5 are similar sectional elevational views through a mould by which the mask of Figure 1 is made, illustrating successive stages of the manufacturing process.

The injection mould 10 of Figures 2-5 has upper and lower parts 5 and 4 which, when the mould is closed as shown in Figures 2 and 3, define between them a cavity 11. The cavity 11 has at its centre a tubular protrusion 12 into the mould part 5. This will form a gas inlet port 3 for the finished mask 20 (Figure 1). The cavity 11 has a relatively thin central region 7 which will form the shell 13 of the mask and a relatively thicker outer region 9 into which material for the cushion 15 will be injected.

The mould part 4 has a tubular slot 16 in which a tubular metal barrier member 6 is movable. In the closed position of the barrier 6 as shown in Figure 2 it isolates the regions 7 and 9 of the mould cavity 11. When withdrawn as shown in Figure 3 it allows communication between the two regions of the mould cavity.

The manufacturing procedure is as follows. With the barrier 6 closed a polymer such as transparent polypropylene is injected in a liquid state into the central region 7 of the mould cavity until it fills the same.

The polymer in the cavity is allowed at least partially to solidify before a second, softer polymer such as a a thermoplastic elastomer is injected in a liquid state into the outer region 9 of the mould cavity. The molten, second polymer will immediately bond to the periphery 8 of the already moulded shell 13 of the mask (Figure 2).

The second, soft polymer injected into the cavity region 9 contains a small proportion of a foaming agent which will release a gas, typically carbon dioxide, when hot. On contact with the relatively cooler mould parts 4,5 the material injected into the outer cavity region 9 forms a skin while its core within the skin remains molten (Figure 3).

The mould is now opened (Figure 4) causing the second, soft polymer to inflate to form the cushion 15 and then the finished mask is ejected from the upper part 5 of the mould (Figure 5).

Injection moulding techniques using a foaming agent to produce differential expansion of different parts of a moulded article are known per se, e. g. from WO 97/03800, so that more detailed description is deemed unnecessary. The present invention applies such techniques to the production of an article which has a relatively hard, usually transparent, central component or shell with an annular cushion bonded to its periphery. The shell and cushion are necessarily of different materials giving rise to the production problems referred to in the preamble of this Specification.

The present invention allows the manufacture of anatomical masks to be automated and to be carried out at great speed. Conventional techniques take several minutes, whereas it is believed that masks can be manufactured by the method of the present invention at a rate of one every 20 seconds per tool cavity. This will permit a considerable reduction in the price of anatomical masks with the advantages aforedescribed.

If the inflation of the cushion 15 is deemed insufficient gas can be introduced directly into cavity region 9 during the foaming process.

Alternatively gas can be introduced into the polymer melt before injection. Supplementary gas inflation of the cushion 15 may be desirable for many reasons. Less of the expensive foaming agent will be required and gases with higher molecular weights than carbon dioxide, gases less likely to permeate the cushion wall, can be used. These gases have the advantage of reducing the deflation or contraction rate of the cushion. The inflation/deflation characteristics of the cushion may be more precisely controlled.

Claims (11)

  1. CLAIMS: 1. A method of manufacturing an anatomical mask (as herein defined) which comprises forming or placing in a mould a central component of the mask comprising a first, relatively hard polymeric material and introducing into the mould a second relatively soft polymeric material containing a foaming agent to contact and bond to the periphery of the central component and opening the mould after the second polymeric material has formed a skin where it contacts the mould but before the second polymeric material has fully solidified whereby the second polymeric material will expand to form a cushion around the periphery of the central component.
  2. 2. A method as claimed in claim 1, wherein the first polymeric material is transparent polypropylene and the second polymeric material is a thermoplastic elastomer.
  3. 3. A method as claimed in either preceding claim, wherein the first polymeric material is allowed at least partially to solidify before exposure to the second polymeric material.
  4. 4. A method as claimed in any one of the preceding claims, wherein a removable barrier is placed within the mould to define the periphery of a central area of the mould cavity, the first polymeric material being injected into said central area in a liquid state and allowed to solidify before removal of the barrier and injection into an outer area of the the mould cavity of the second polymeric material in a liquid state.
  5. 5. A method as claimed in any one of the preceding claims, wherein gas from a source other than the foaming agent is introduced into the cushion material before the latter has solidified.
  6. 6. A method as claimed in claim 5, wherein a gas is introduced under pressure into the second polymeric material before its introduction into the mould.
  7. 7. A method of manufacturing an anatomical mask (as herein defined) substantially as hereinbefore described.
  8. 8. Apparatus for use in carrying out the method of any one of the preceding claims, the apparatus comprising a mould having two parts separable across a cavity defined between the parts when the mould is closed, the cavity having a central, relatively thin area to form the central component of the mask and an outer relatively thicker area into which the second polymeric material will be injected, said two areas being separable by a removable barrier which, when present in the mould, defines the periphery of the central component of the mask.
  9. 9. Apparatus as claimed in claim 8, wherein the barrier is tubular and is movable into or out of the mould through a tubular slot in one of the mould parts.
  10. 10. Apparatus for use in carrying out the method of any one of claims 1-7 substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
  11. 11. An anatomical mask (as herein defined) made by the method of any one of claims 1-7 or by means of the apparatus claimed in any one of claims 810.
    11. An anatomical mask (as herein defined) made by the method of any one of claims 1-7 or by means of the apparatus claimed in any one of claims 810. Amendments to the claims have been filed as follows CLAIMS: 1. A method of manufacturing an anatomical mask (as herein defined) which comprises forming or placing in a mould a central component of the mask comprising a first, relatively hard polymeric material and introducing into the mould a second relatively soft polymeric material containing a foaming agent to contact and bond to the periphery of the central component and opening the mould after the second polymeric material has formed a skin where it contacts the mould but before the second polymeric material has fully solidified whereby the second polymeric material will expand to form a cushion around the periphery of the central component.
    2. A method as claimed in claim 1, wherein the first polymeric material is transparent polypropylene and the second polymeric material is a thermoplastic elastomer.
    3. A method as claimed in either preceding claim, wherein the first polymeric material is allowed at least partially to solidify before exposure to the second polymeric material.
    4. A method as claimed in any one of the preceding claims, wherein a removable barrier is placed within the mould to define the periphery of a central area of the mould cavity, the first polymeric material being injected into said central area in a liquid state and allowed to solidify before removal of the barrier and injection into an outer area of the the mould cavity of the second polymeric material in a liquid state.
    5. A method as claimed in any one of the preceding claims, wherein gas from a source other than the foaming agent is introduced into the cushion material before the latter has solidified.
    6. A method as claimed in claim 5, wherein a gas is introduced under pressure into the second polymeric material before its introduction into the mould.
    7. A method of manufacturing an anatomical mask (as herein defined) substantially as hereinbefore described.
    8. Apparatus when used to perform the method of any one of the preceding claims, the apparatus comprising a mould having two parts separable across a cavity defined between the parts when the mould is closed, the cavity having a central, relatively thin area to form the central component of the mask and an outer relatively thicker area into which the second polymeric material will be injected, said two areas being separable by a removable barrier which, when present in the mould, defines the periphery of the central component of the mask.
    9. Apparatus as claimed in claim 8, wherein the barrier is tubular and is movable into or out of the mould through a tubular slot in one of the mould parts.
    10. Apparatus when used to perform the method of any one of claims 1-7 substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB0120066A 2001-08-17 2001-08-17 Moulded anatomical mask Withdrawn GB2367525A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0120066A GB2367525A (en) 2001-08-17 2001-08-17 Moulded anatomical mask

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0120066A GB2367525A (en) 2001-08-17 2001-08-17 Moulded anatomical mask
PCT/GB2002/003565 WO2003016018A1 (en) 2001-08-17 2002-07-30 Anatomical mask

Publications (2)

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GB0120066D0 GB0120066D0 (en) 2001-10-10
GB2367525A true GB2367525A (en) 2002-04-10

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Family Applications (1)

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GB0120066A Withdrawn GB2367525A (en) 2001-08-17 2001-08-17 Moulded anatomical mask

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016018A1 (en) * 2001-08-17 2003-02-27 Intersurgical Limited Anatomical mask
CN100563746C (en) 2003-04-11 2009-12-02 阿姆布股份有限公司 Laryngeal mask and method for the manufacture thereof
EP2147769A1 (en) * 2008-07-22 2010-01-27 MAP Medizin-Technologie GmbH Cushion, method of and apparatus for molding a cushion for a respiratory mask
US7694682B2 (en) * 2003-04-11 2010-04-13 Ambu A/S Laryngeal mask and a method manufacturing same
JP2014505499A (en) * 2010-11-19 2014-03-06 スリーエム イノベイティブ プロパティズ カンパニー Filtration face piece respirator with overmolded face seal
WO2015058731A1 (en) * 2013-10-25 2015-04-30 Technická Univerzita V Liberci - Katedra Strojírenské Technologie Oddělení Tváření Kovů A Zpracování Plastů Protective breathing mask with the collective inhalation and exhalation hole
JP2016537218A (en) * 2013-10-17 2016-12-01 イン テク カンパニー リミテッド Velcro Inserting Type Filter Replacement General-Purpose Synthetic Resin Mask, Injection Molding Apparatus and Manufacturing Method Therefor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1126535A (en) * 1965-05-05 1968-09-05 Desma Werke Gmbh Improvements in articles of footwear comprising multi-part soles and methods of and apparatus for the manufacture thereof
GB2273678A (en) * 1992-01-15 1994-06-29 Patrick Arthur Leach Method and apparatus for making a loudspeaker cone and surround assembly
WO1997003800A1 (en) * 1995-07-18 1997-02-06 Coraltech Limited Moulded foam article with thick and thin wall portions
GB2328395A (en) * 1998-07-15 1999-02-24 Kurt Mueller Injection-compression moulding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1126535A (en) * 1965-05-05 1968-09-05 Desma Werke Gmbh Improvements in articles of footwear comprising multi-part soles and methods of and apparatus for the manufacture thereof
GB2273678A (en) * 1992-01-15 1994-06-29 Patrick Arthur Leach Method and apparatus for making a loudspeaker cone and surround assembly
WO1997003800A1 (en) * 1995-07-18 1997-02-06 Coraltech Limited Moulded foam article with thick and thin wall portions
GB2328395A (en) * 1998-07-15 1999-02-24 Kurt Mueller Injection-compression moulding

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016018A1 (en) * 2001-08-17 2003-02-27 Intersurgical Limited Anatomical mask
CN100563746C (en) 2003-04-11 2009-12-02 阿姆布股份有限公司 Laryngeal mask and method for the manufacture thereof
US7694682B2 (en) * 2003-04-11 2010-04-13 Ambu A/S Laryngeal mask and a method manufacturing same
EP2147769A1 (en) * 2008-07-22 2010-01-27 MAP Medizin-Technologie GmbH Cushion, method of and apparatus for molding a cushion for a respiratory mask
WO2010009877A1 (en) * 2008-07-22 2010-01-28 Map Medizin-Technologie Gmbh Cushion, method of and apparatus for molding a cushion for a respiratory mask
US10195775B2 (en) 2008-07-22 2019-02-05 Resmed R&D Germany Gmbh Cushion, method of and apparatus for molding a cushion for a respiratory mask
JP2014505499A (en) * 2010-11-19 2014-03-06 スリーエム イノベイティブ プロパティズ カンパニー Filtration face piece respirator with overmolded face seal
JP2016537218A (en) * 2013-10-17 2016-12-01 イン テク カンパニー リミテッド Velcro Inserting Type Filter Replacement General-Purpose Synthetic Resin Mask, Injection Molding Apparatus and Manufacturing Method Therefor
WO2015058731A1 (en) * 2013-10-25 2015-04-30 Technická Univerzita V Liberci - Katedra Strojírenské Technologie Oddělení Tváření Kovů A Zpracování Plastů Protective breathing mask with the collective inhalation and exhalation hole
US20160287915A1 (en) * 2013-10-25 2016-10-06 Technická Univerzita V Libercikatedra Strojírenské Technologie Oddelení Tvárení Kovu A Zpracování Protective Breathing Mask with the Collective Inhalation and Exhalation Hole
JP2017509377A (en) * 2013-10-25 2017-04-06 テクニカ ユニバーズィータ ヴ リベルーシ−カテドゥラ ストロジレンスケ テクノロジー オッデレーニ トゥヴァレニ コヴ ア ズプラコヴァーニ プラツ Protective breathing mask with shared breathing holes

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