US20100306903A1 - Improvement to a plastic part of a protective helmet - Google Patents

Improvement to a plastic part of a protective helmet Download PDF

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Publication number
US20100306903A1
US20100306903A1 US12/677,212 US67721208A US2010306903A1 US 20100306903 A1 US20100306903 A1 US 20100306903A1 US 67721208 A US67721208 A US 67721208A US 2010306903 A1 US2010306903 A1 US 2010306903A1
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US
United States
Prior art keywords
protective helmet
parts
plastic
thermoplastic
plastic part
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.)
Abandoned
Application number
US12/677,212
Inventor
Louis Guay
Philippe Vigouroux
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.)
Solios Environnement SA
Solios Carbone SA
MSA Gallet SAS
Original Assignee
MSA Gallet SAS
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 MSA Gallet SAS filed Critical MSA Gallet SAS
Assigned to SOLIOS ENVIRONNEMENT, SOLIOS CARBONE reassignment SOLIOS ENVIRONNEMENT CORRECTIVE ASSIGNMENT TO CORRECT THE THE RECEIVING PARTY DATA IS INCORRECT. PREVIOUSLY RECORDED ON REEL 024417 FRAME 0708. ASSIGNOR(S) HEREBY CONFIRMS THE THE ORIGINAL ASSIGNE SHOULD BE NAMED "SOLIOS ENVIRONNEMENT AND SOLIOS CARBONE. Assignors: MALARD, THIERRY, MAHIEU, PIERRE
Assigned to MSA GALLET reassignment MSA GALLET ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VIGOUROUX, PHILIPPE, GUAY, LOUIS
Publication of US20100306903A1 publication Critical patent/US20100306903A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42C—MANUFACTURING OR TRIMMING HEAD COVERINGS, e.g. HATS
    • A42C2/00—Manufacturing helmets by processes not otherwise provided for
    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/06—Impact-absorbing shells, e.g. of crash helmets

Definitions

  • the present invention is in the field of the production of plastic parts and more particularly the production of plastic parts of a protective helmet. According to the invention, a process is provided for treating these materials in order to improve their strength at low and high temperatures.
  • the parts of a protective helmet are intended more particularly for firefighters' helmets and are in particular the outer shell thereof and the plastic parts associated therewith, such as the parts for holding the chinstrap or the breathing mask, for example, or the pivot pins for protective shields, inner headband, etc.
  • Protective helmets in particular firefighters' helmets, have a shell produced from thermoplastic and are currently made either of polyamide or an acrylonitrile-butadiene-styrene/polycarbonate (ABS/PC) alloy. It is difficult to reconcile the resistance at high temperature, for example at +120° C., with the resistance at low temperature, such as in particular at ⁇ 40° C., of one and the same thermoplastic.
  • ABS/PC acrylonitrile-butadiene-styrene/polycarbonate
  • the parts of which the helmet consists could be made of a different material, for example metal, curable polymer or high-performance thermoplastic, such as polyphthalamide (PPA), polyethylene sulfone (PES), polyetheretherketone (PEEK).
  • PPA polyphthalamide
  • PES polyethylene sulfone
  • PEEK polyetheretherketone
  • weight is an important factor, as is the manufacturing cost.
  • the present invention aims to solve the abovementioned problems by providing a particularly simple and effective process for giving the helmet parts produced from thermoplastic qualities identical to those they would have if they were produced from other materials such as thermosetting plastic, for example.
  • the helmet parts made of thermoplastics are ionized, it being known that ionization is a process which is essentially only used for sterilizing medical and surgical material and for preserving agricultural food products.
  • the parts treated according to the invention have mechanical characteristics around 5 to 10% better for the same range of temperatures, and the novel mechanical characteristics make it possible to use the helmet in a wider range of uses.
  • the protective helmet produced according to the invention has a greatly improved cold and heat resistance, and this is particularly advantageous for a firefighter's helmet.
  • the plastic part of a protective helmet is characterized in that it is subjected to a treatment to improve its technical characteristics and in particular the mechanical strength at low and high temperatures of a part of a protective helmet, said treatment consisting in subjecting these parts to ionizing radiation.
  • the part is made of plastic of the thermoplastic type, such as of thermoplastic of the polyamide 6 (PA-6) type, for example, or of polyamide 6,6 (PA-6,6).
  • thermoplastic type such as of thermoplastic of the polyamide 6 (PA-6) type, for example, or of polyamide 6,6 (PA-6,6).
  • the part is an outer shell of a protective helmet made of thermoplastic.
  • the ionizing radiation is electron ionization or photon ionization.
  • the invention also relates to the process for producing parts, which comprises the following steps:
  • a coagent is introduced into the formulation, the aim of the coagent being to enable the bridging of macromolecular chains while the double bonds of which it is composed are opened.
  • the plastic parts of the protective helmet such as its shell and/or its accessories and various parts associated with it, which are produced with a thermoplastic, are subjected according to the invention to a treatment intended to improve their resistance to both low and high temperatures, these parts not having this resistance without having been subjected to the treatment of the invention.
  • the treatment of the invention consists in a process utilizing ionizing radiation, which, with sufficient energy, gives rise to reactive entities known as ions within the material.
  • reactive entities known as ions within the material.
  • the ions are immediately converted into active free radicals, which by combining create new permanent chemical bonds.
  • the plastic parts of the helmet of the invention are made for example of a thermoplastic polymer, such as polyamide (PA), and are advantageously of the polyamide 6 (PA-6) or the polyamide 6,6 (PA-6,6) type, these being materials which react perfectly with electrons; the material could, however, be of the polyamide 4,6 (PA-4,6) or polyamide 11 (PA-11) type.
  • PA polyamide
  • PA-6,6 polyamide 6,6
  • Two types of ionization may be used for the process of the invention, namely electron ionization (beta treatment) or photon ionization (gamma treatment).
  • the photons emitted by a radioactive source move the electrons in order to create ions.
  • the protective helmet and/or its attachments may be produced from thermoplastic and crosslinking by ionization gives these parts an identical strength to that of thermosetting polymers or high performance thermoplastics (PPA, PES, PEEK).
  • the parts produced and crosslinked by ionizations are lighter for given characteristics and their preparation, for example by injection molding, is easier, with a reduced cycle time.
  • the sharp melting point of the material is eliminated, thereby giving the material improved stability of mechanical properties at high temperatures.
  • thermoplastic During ionization, bridging of molecular chains takes places and this tends to give the thermoplastic the same behavior as a thermosetting plastic.
  • the process for treating parts comprises the following steps:
  • the parts are produced from plastic, for example by thermoplastic injection molding, such as from polyamide 6 or polyamide 6,6, for example.
  • the parts are produced, for example, by injection molding on the basis of granules of the abovementioned materials.
  • a coagent has previously been introduced into the formulation, the aim of the coagent being to enable the bridging of macromolecular chains while the double bonds of which it is composed are opened.
  • the use of a coagent in the formulation also brings about a substantial lowering of the amount necessary for crosslinking the macromolecular chains.
  • the preferred coagents are from the methacrylate or allyl family.
  • the volume of incorporation of the coagent into the formulation is, for example, between 0.05% and 10% by weight.
  • the parts are introduced into an ionizing chamber in order to be subjected to ionizing radiation.
  • the impact strength of the part treated by ionization is improved, and particularly its low-temperature impact strength. It is noted that in order to increase the low-temperature impact strength of a polyamide of the PA-6 or PA-6,6 type it is possible to use two treatment techniques:

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Abstract

The invention relates to a plastic part of a protective helmet, characterised in that the parts undergo a treatment in order to improve the technical specifications thereof, in particular the mechanical strength of a part of a protective helmet at low and high temperatures, said treatment comprising the application of ionising radiation to the parts.

Description

  • The present invention is in the field of the production of plastic parts and more particularly the production of plastic parts of a protective helmet. According to the invention, a process is provided for treating these materials in order to improve their strength at low and high temperatures.
  • The parts of a protective helmet are intended more particularly for firefighters' helmets and are in particular the outer shell thereof and the plastic parts associated therewith, such as the parts for holding the chinstrap or the breathing mask, for example, or the pivot pins for protective shields, inner headband, etc.
  • Protective helmets, in particular firefighters' helmets, have a shell produced from thermoplastic and are currently made either of polyamide or an acrylonitrile-butadiene-styrene/polycarbonate (ABS/PC) alloy. It is difficult to reconcile the resistance at high temperature, for example at +120° C., with the resistance at low temperature, such as in particular at −40° C., of one and the same thermoplastic.
  • Of course, the parts of which the helmet consists could be made of a different material, for example metal, curable polymer or high-performance thermoplastic, such as polyphthalamide (PPA), polyethylene sulfone (PES), polyetheretherketone (PEEK). However, in the case of a protective helmet, weight is an important factor, as is the manufacturing cost.
  • The present invention aims to solve the abovementioned problems by providing a particularly simple and effective process for giving the helmet parts produced from thermoplastic qualities identical to those they would have if they were produced from other materials such as thermosetting plastic, for example.
  • Thus, according to the invention, the helmet parts made of thermoplastics are ionized, it being known that ionization is a process which is essentially only used for sterilizing medical and surgical material and for preserving agricultural food products.
  • It is known that at low temperatures, the impact properties are worse, while at high temperatures the mechanical strength is greatly reduced. The parts treated according to the invention have mechanical characteristics around 5 to 10% better for the same range of temperatures, and the novel mechanical characteristics make it possible to use the helmet in a wider range of uses.
  • In summary, the protective helmet produced according to the invention has a greatly improved cold and heat resistance, and this is particularly advantageous for a firefighter's helmet. Thus, according to the invention, the plastic part of a protective helmet is characterized in that it is subjected to a treatment to improve its technical characteristics and in particular the mechanical strength at low and high temperatures of a part of a protective helmet, said treatment consisting in subjecting these parts to ionizing radiation.
  • According to a complementary characteristic, the part is made of plastic of the thermoplastic type, such as of thermoplastic of the polyamide 6 (PA-6) type, for example, or of polyamide 6,6 (PA-6,6).
  • According to another characteristic, the part is an outer shell of a protective helmet made of thermoplastic.
  • It may be added that, according to the invention, the ionizing radiation is electron ionization or photon ionization.
  • The invention also relates to the process for producing parts, which comprises the following steps:
      • in a preliminary first step, the parts are produced from plastic, for example by thermoplastic injection molding,
      • in a second step, the parts are introduced into an ionizing chamber in order to be subjected to ionizing radiation, and
      • in a third step, the parts, once they have been ionized, are removed.
  • According to a complementary characteristic of the process, before the injection molding, a coagent is introduced into the formulation, the aim of the coagent being to enable the bridging of macromolecular chains while the double bonds of which it is composed are opened.
  • Further characteristics and advantages of the invention will emerge from the following description.
  • The plastic parts of the protective helmet, such as its shell and/or its accessories and various parts associated with it, which are produced with a thermoplastic, are subjected according to the invention to a treatment intended to improve their resistance to both low and high temperatures, these parts not having this resistance without having been subjected to the treatment of the invention.
  • The treatment of the invention consists in a process utilizing ionizing radiation, which, with sufficient energy, gives rise to reactive entities known as ions within the material. In the case of the plastic of the helmet and its accessories or associated parts, the ions are immediately converted into active free radicals, which by combining create new permanent chemical bonds.
  • The plastic parts of the helmet of the invention are made for example of a thermoplastic polymer, such as polyamide (PA), and are advantageously of the polyamide 6 (PA-6) or the polyamide 6,6 (PA-6,6) type, these being materials which react perfectly with electrons; the material could, however, be of the polyamide 4,6 (PA-4,6) or polyamide 11 (PA-11) type.
  • Two types of ionization may be used for the process of the invention, namely electron ionization (beta treatment) or photon ionization (gamma treatment).
  • In the course of electron ionization, the electrons emitted by an electric source lose some of their kinetic energy each time they collide with an atom of the part treated.
  • In the course of photon ionization, the photons emitted by a radioactive source move the electrons in order to create ions.
  • Crosslinking by ionization increases the choice of materials. Thus, the protective helmet and/or its attachments may be produced from thermoplastic and crosslinking by ionization gives these parts an identical strength to that of thermosetting polymers or high performance thermoplastics (PPA, PES, PEEK).
  • Thus, the parts produced and crosslinked by ionizations are lighter for given characteristics and their preparation, for example by injection molding, is easier, with a reduced cycle time.
  • According to the process of the invention, the sharp melting point of the material is eliminated, thereby giving the material improved stability of mechanical properties at high temperatures.
  • During ionization, bridging of molecular chains takes places and this tends to give the thermoplastic the same behavior as a thermosetting plastic.
  • The process for treating parts comprises the following steps:
  • In a preliminary first step, the parts are produced from plastic, for example by thermoplastic injection molding, such as from polyamide 6 or polyamide 6,6, for example.
  • The parts are produced, for example, by injection molding on the basis of granules of the abovementioned materials. A coagent has previously been introduced into the formulation, the aim of the coagent being to enable the bridging of macromolecular chains while the double bonds of which it is composed are opened. The use of a coagent in the formulation also brings about a substantial lowering of the amount necessary for crosslinking the macromolecular chains. The preferred coagents are from the methacrylate or allyl family. The volume of incorporation of the coagent into the formulation is, for example, between 0.05% and 10% by weight.
  • In a second step, the parts are introduced into an ionizing chamber in order to be subjected to ionizing radiation.
  • In a third step, the parts, once they have been ionized, are removed.
  • It has been understood that, by virtue of the ionizing treatment, the impact strength of the part treated by ionization is improved, and particularly its low-temperature impact strength. It is noted that in order to increase the low-temperature impact strength of a polyamide of the PA-6 or PA-6,6 type it is possible to use two treatment techniques:
      • either grafting linked to the exposure of the material to radiation, such as with compounds of ethylene dimonomer (EPDM) or copolyamides-6,12 (CoPA-6,12) or else thermoplastic polyester elastomers (TPE-E).
  • Of course, the invention is not limited to the embodiments described and shown by way of example, but also comprises all the technical equivalents and their combinations.

Claims (11)

1. A plastic part of a protective helmet, characterized in that the parts are subjected to a treatment to improve their technical characteristics and in particular the mechanical strength at low and high temperatures of a part of a protective helmet, said treatment consisting in subjecting these parts to ionizing radiation.
2. The plastic part of a protective helmet as claimed in the preceding claim, characterized in that the part is made of plastic of the thermoplastic type.
3. The plastic part of a protective helmet as claimed in the preceding claim, characterized in that the part is made of plastic of the thermoplastic type of the polyamide 6 (PA-6) type.
4. The plastic part of a protective helmet as claimed in claim 2, characterized in that the part is made of plastic of the thermoplastic type of the polyamide 6,6 (PA-6,6) type.
5. The plastic part of a protective helmet as claimed in the preceding claim, characterized in that the part is an outer shell of a protective helmet made of thermoplastic.
6. The plastic part of a protective helmet as claimed in any one of the preceding claims, characterized in that the ionizing radiation is electron ionization.
7. The plastic part of a protective helmet as claimed in any one of claims 1 to 5, characterized in that the ionizing radiation is photon ionization.
8. Process for producing parts as claimed in any one of the preceding claims, characterized in that the process comprises the following steps:
in a preliminary first step, the parts are produced from plastic, for example by thermoplastic injection molding,
in a second step, the parts are introduced into an ionizing chamber in order to be subjected to ionizing radiation, and
in a third step, the parts, once they have been ionized, are removed.
9. The process as claimed in the preceding claim, characterized in that, before the injection molding, a coagent is introduced into the formulation, the aim of the coagent being to enable the bridging of macromolecular chains while the double bonds of which it is composed are opened.
10. The process as claimed in the preceding claim, characterized in that coagent is from the methacrylate or allyl family.
11. The process as claimed in the preceding claim, characterized in that the volume of incorporation of the coagent into the formulation is between 0.05% and 10% by weight.
US12/677,212 2007-09-10 2008-09-05 Improvement to a plastic part of a protective helmet Abandoned US20100306903A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR07/06335 2007-09-10
FR0706335A FR2920644B1 (en) 2007-09-10 2007-09-10 IMPROVEMENT FOR A PLASTIC PART OF A PROTECTIVE HELMET
PCT/FR2008/001239 WO2009066018A2 (en) 2007-09-10 2008-09-05 Improvement to a plastic part of a protective helmet

Publications (1)

Publication Number Publication Date
US20100306903A1 true US20100306903A1 (en) 2010-12-09

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US12/677,212 Abandoned US20100306903A1 (en) 2007-09-10 2008-09-05 Improvement to a plastic part of a protective helmet

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US (1) US20100306903A1 (en)
EP (1) EP2185017B1 (en)
AT (1) ATE519392T1 (en)
FR (1) FR2920644B1 (en)
PL (1) PL2185017T3 (en)
WO (1) WO2009066018A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10856984B2 (en) 2017-08-25 2020-12-08 Neovasc Tiara Inc. Sequentially deployed transcatheter mitral valve prosthesis

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US2858259A (en) * 1952-12-06 1958-10-28 Gen Electric Electron irradiation of preformed polyamide resin
US3101275A (en) * 1957-05-15 1963-08-20 Du Pont Process of coating a shaped swollen polymer substrate and treating with ionizing radiation
US3842705A (en) * 1973-03-15 1974-10-22 D Woodard Stringed instruments with improved strings due to irradiation and process for producing the same
US4037112A (en) * 1975-03-25 1977-07-19 Ppg Industries, Inc. Apparatus for crosslinking ultraviolet light curable coatings
US4065624A (en) * 1976-01-27 1977-12-27 Ppg Industries, Inc. Radiation curable coating composition
US4170663A (en) * 1978-03-13 1979-10-09 Ppg Industries, Inc. Method for producing coatings of low gloss
US4268339A (en) * 1979-07-17 1981-05-19 General Electric Company Process for radiation cured continuous laminates
US4444816A (en) * 1980-12-03 1984-04-24 Raychem Corporation Radiation cross-linking of polyamides
US4953234A (en) * 1987-08-03 1990-09-04 Allied-Signal Inc. Impact resistant helmet
US6207077B1 (en) * 2000-02-18 2001-03-27 Orion 21 A.D. Pty Ltd Luminescent gel coats and moldable resins
US20030229131A1 (en) * 2002-02-26 2003-12-11 Board Of Regents, The University Of Texas System Cyclo[n]pyrroles and methods thereto
US6846758B2 (en) * 2002-04-19 2005-01-25 Honeywell International Inc. Ballistic fabric laminates
US7008559B2 (en) * 2001-06-06 2006-03-07 Nomadics, Inc. Manganese doped upconversion luminescence nanoparticles
US7067072B2 (en) * 2001-08-17 2006-06-27 Nomadics, Inc. Nanophase luminescence particulate material
US20110107503A1 (en) * 2008-07-02 2011-05-12 Donald Edward Morgan Compressible Liner for Impact Protection

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JPS5912936A (en) * 1982-07-13 1984-01-23 Sumitomo Electric Ind Ltd Crosslinked polyamide resin composition
DE19525834A1 (en) * 1995-05-12 1996-11-14 Heidemann Werke Mfr. of gearbox parts from high-molecular plastic
JPH11315156A (en) * 1998-05-07 1999-11-16 Shinko Chemical Co Ltd Highly heat-resistant crosslinked molded product of noncrystalline polyamide and its production
ITRE20040085A1 (en) * 2004-07-15 2004-10-15 Bl Service Sas Di Lusetti Eros MULTI-PURPOSE MATERIAL WITH HIGH PHYSICAL AND MECHANICAL CHARACTERISTICS.

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US40422A (en) * 1863-10-27 Improvement in wagon-standards
US2858259A (en) * 1952-12-06 1958-10-28 Gen Electric Electron irradiation of preformed polyamide resin
US3101275A (en) * 1957-05-15 1963-08-20 Du Pont Process of coating a shaped swollen polymer substrate and treating with ionizing radiation
US3842705A (en) * 1973-03-15 1974-10-22 D Woodard Stringed instruments with improved strings due to irradiation and process for producing the same
US4037112A (en) * 1975-03-25 1977-07-19 Ppg Industries, Inc. Apparatus for crosslinking ultraviolet light curable coatings
US4065624A (en) * 1976-01-27 1977-12-27 Ppg Industries, Inc. Radiation curable coating composition
US4170663A (en) * 1978-03-13 1979-10-09 Ppg Industries, Inc. Method for producing coatings of low gloss
US4268339A (en) * 1979-07-17 1981-05-19 General Electric Company Process for radiation cured continuous laminates
US4444816A (en) * 1980-12-03 1984-04-24 Raychem Corporation Radiation cross-linking of polyamides
US4953234A (en) * 1987-08-03 1990-09-04 Allied-Signal Inc. Impact resistant helmet
US6207077B1 (en) * 2000-02-18 2001-03-27 Orion 21 A.D. Pty Ltd Luminescent gel coats and moldable resins
US7008559B2 (en) * 2001-06-06 2006-03-07 Nomadics, Inc. Manganese doped upconversion luminescence nanoparticles
US7067072B2 (en) * 2001-08-17 2006-06-27 Nomadics, Inc. Nanophase luminescence particulate material
US20030229131A1 (en) * 2002-02-26 2003-12-11 Board Of Regents, The University Of Texas System Cyclo[n]pyrroles and methods thereto
US6984734B2 (en) * 2002-02-26 2006-01-10 Board Of Regents, The University Of Texas System Cyclo[n]pyrroles and methods thereto
US6846758B2 (en) * 2002-04-19 2005-01-25 Honeywell International Inc. Ballistic fabric laminates
US20110107503A1 (en) * 2008-07-02 2011-05-12 Donald Edward Morgan Compressible Liner for Impact Protection

Also Published As

Publication number Publication date
PL2185017T3 (en) 2012-05-31
FR2920644B1 (en) 2009-12-04
EP2185017A2 (en) 2010-05-19
EP2185017B1 (en) 2011-08-10
FR2920644A1 (en) 2009-03-13
WO2009066018A3 (en) 2009-07-16
WO2009066018A2 (en) 2009-05-28
ATE519392T1 (en) 2011-08-15

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Owner name: SOLIOS CARBONE, FRANCE

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