EP3108724A1 - Appareil comprenant un thermoplastique moulé par injection et procédé - Google Patents

Appareil comprenant un thermoplastique moulé par injection et procédé

Info

Publication number
EP3108724A1
EP3108724A1 EP14883064.9A EP14883064A EP3108724A1 EP 3108724 A1 EP3108724 A1 EP 3108724A1 EP 14883064 A EP14883064 A EP 14883064A EP 3108724 A1 EP3108724 A1 EP 3108724A1
Authority
EP
European Patent Office
Prior art keywords
plastic
crystalline
injection molded
amorphous
temperature
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Withdrawn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
EP14883064.9A
Other languages
German (de)
English (en)
Other versions
EP3108724A4 (fr
Inventor
Rob THOMPSON
Nigel DUNLEA
Kairong LIAO
Yi Yang
Chuanhua CHIANG
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.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
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 Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of EP3108724A1 publication Critical patent/EP3108724A1/fr
Publication of EP3108724A4 publication Critical patent/EP3108724A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0039—Amorphous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/004—Semi-crystalline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements

Definitions

  • Embodiments of the present invention relate to an apparatus comprising injection molded thermoplastic and a method.
  • Engineering plastics are often used for forming injection molded apparatus such as housing components for electronic devices.
  • the molded engineering plastic may not, however, provide a desired surface texture to a user.
  • a solution to this problem has been to apply an elastomer coating to a rigid substrate of molded engineering plastic.
  • the elastomer coating provides a 'soft-touch' exterior.
  • an apparatus comprising: a body comprising injection molded semi-crystalline thermoplastic comprising a first amorphous portion that defines at least an exterior surface of the body and a second crystalline portion that defines at least an interior of the body; wherein the first amorphous portion comprises interstitial spaces and wherein a surface texture of the exterior surface of the body is determined by exposed interstitial spaces.
  • a method comprising: enabling slower solidification of injected plastic within a mold to produce a core of crystalline plastic; enabling faster solidification of injected plastic adjacent the mold to produce a skin of amorphous plastic; ejecting the molded plastic;
  • Fig 1 illustrates an example of an apparatus that has a body comprising injection molded semi-crystalline thermoplastic
  • Fig 2 illustrates an example of an apparatus that has a body comprising injection molded semi-crystalline thermoplastic that has an exterior amorphous portion comprising exposed interstitial spaces;
  • Fig 3 illustrates an example of an apparatus that has a body comprising injection molded semi-crystalline thermoplastic that has an exterior amorphous portion comprising cross-linked polymer chains;
  • Fig 4 illustrates an example of an injection molding system
  • Fig 5 illustrates an example of a method for manufacturing the apparatus previously described in relation to Figs 1 , 2 or 3;
  • Fig 6 illustrates operational parameters of the injection molding system
  • Fig 7 illustrates an example of an exterior housing for an electronic device that has a body comprising injection molded semi-crystalline thermoplastic that has an exposed exterior amorphous portion comprising exposed interstitial spaces and which is used without an over- coating.
  • the apparatus 2 at least in some examples has a rigid 'soft-touch' exterior provided by a polished exterior surface 22 of a first amorphous portion 12 rather than by application of an elastomer coating to a rigid substrate.
  • a rigid 'soft-touch' apparatus 2 is a single component that has, as technical effect, both an exterior texture similar to an elastomer and has the rigidity of an engineering plastic.
  • Fig 1 illustrates an example of an apparatus 2.
  • the apparatus 2 has a body 20 comprising injection molded semi-crystalline thermoplastic 10.
  • the injection molded semi-crystalline thermoplastic 10 comprises a first amorphous portion 12 that defines at least an exterior surface 22 of the body 20 and a second crystalline portion 14 that defines at least an interior 24 of the body 20.
  • Fig 2 illustrates a schematic illustration of injection molded semi-crystalline thermoplastic 10 comprising a first amorphous portion 12 that defines at least an exterior surface 22 of the body 20 and a second crystalline portion 14 that defines at least an interior 24 of the body 20.
  • the first amorphous portion 12 comprises interstitial spaces 30.
  • a surface texture of the exterior surface 22 of the body 20 is determined by exposed interstitial spaces 32 at a polished exterior surface 22 of first amorphous portion 12.
  • Fig 3 illustrates a schematic illustration of injection molded semi-crystalline thermoplastic 10 comprising a first amorphous portion 12 that defines at least an exterior surface 22 of the body 20 and a second crystalline portion 14 that defines at least an interior 24 of the body 20.
  • the injection molded semi- crystalline thermoplastic 10 comprises polarized polymer chains 40 that can cross-link via Van der Waals forces.
  • the first amorphous portion 12 may be a non-annealed 'frozen' amorphous state of the thermoplastic 10.
  • the polymer chains 30 may be randomly arranged and cross-linked. This results in a high configurational entropy. Voids formed between the cross-linking polymer chains 30 form the interstitial spaces 30.
  • a surface texture of the exterior surface 22 of the body 20 is determined by exposed interstitial spaces 32 at a polished exterior surface 22 of first amorphous portion 12.
  • the interstitial spaces 32 are distributed throughout the first amorphous portion 12 which may consequentially be described as micro-porous.
  • the second crystalline portion 14 may be an annealed 'frozen' crystalline state of the thermoplastic 10.
  • the polymer chains 30 are ordered and may be aligned. This results in a low configurational entropy. Voids are not formed between the polymer chains 30 and there are none or fewer/smaller interstitial spaces 30.
  • the first amorphous portion 12 may therefore have a higher proportion of cross-linking polymer chains 40 and a lower proportion of aligned polymer chains 40 than the second crystalline portion 14.
  • the second crystalline portion 14 forms a core of the injection molded semi-crystalline thermoplastic 10 being entirely surrounded by a skin of the first amorphous portion 12.
  • the injection molded semi-crystalline thermoplastic 10 may be an engineering thermoplastic.
  • the thermoplastic 10 may be selected to have a low-rate of cystallinity.
  • the injection molded semi-crystalline thermoplastic 10 may have a Vicat softening point greater than 100°C.
  • the first amorphous portion 12 may have an acceptable hardness according to IS0518. For example, it may have no visible scratches at a load of 3N using a 0.75mm tip diameter hardness test pencil.
  • the body 29 may have a stiffness in the range 50-70MPa.
  • the injection molded semi-crystalline thermoplastic 10 may be homopolymer.
  • the injection molded semi-crystalline thermoplastic may comprise or consist of acetal polymer.
  • the injection molded semi- crystalline thermoplastic may comprise or consist of polyoxymethylene (POM).
  • the second crystalline portion 14 will typically have a greater density than the first amorphous portion 12 and will become flexible at a higher temperature than the first amorphous portion 12.
  • the second crystalline portion 14 may become liquid over a narrow temperature band at its melting temperature.
  • Fig 4 illustrates an example of an injection molding system 100.
  • the system 100 comprises a cylinder 102 narrowing to a nozzle 104, an Archimedes screw 106 for injecting the thermoplastic 10 (not illustrated), a mold 1 10 configured to receive the injected thermoplastic 10 and a pressure system 120 for applying pressure to the mold 1 10 during the cooling of the thermoplastic 10.
  • the cylinder 102 has a cylinder temperature T1 .
  • the nozzle 104 has a nozzle temperature T2.
  • the mold 1 10 has a mold contact temperature T3.
  • the pressure system 120 applies a molding pressure P.
  • Fig 5 illustrates an example of a method 200 for manufacturing the apparatus 2 previously described in relation to Figs 1 , 2 or 3.
  • the method comprises: slow solidification 202 of injected plastic 10 within a mold 1 10 to produce a core 24 of crystalline plastic 14 and fast solidification of injected plastic 10 adjacent the mold 1 10 to produce a skin of amorphous plastic 12;
  • Slow solidification 202 of injected plastic 10 within a mold 1 10 to produce a core 24 of crystalline plastic 14 and fast solidification of injected plastic adjacent the mold to produce a skin of amorphous plastic are enabled by using non-standard operating parameters of the injection molding system 100.
  • the cylinder temperature T1 and nozzle temperature T2 are unusually high compared to conventional operation of an injection molding system 100, and the mold contact temperature T3 and the applied molding pressure P are unusually low compared to conventional operation of an injection molding system 100.
  • thermoplastic 10 is injected as a molten liquid, it may be at a temperature at least 10% above its melting point temperature.
  • a large temperature difference between the molten plastic 10 and the mold 1 10 results in rapid solidification of the liquid plastic 10 adjacent the mold 1 10 forming the first amorphous portion 12, whereas the higher plastic temperature results in slower solidification at the mold core forming the second crystalline portion 14.
  • the injected thermoplastic 10 may comprise or consist of polyoxymethylene (POM).
  • POM polyoxymethylene
  • the melting temperature of polyoxymethylene (POM) Tm is around 180°C.
  • the cylinder temperature T1 and nozzle temperature T2 are unusually high compared to conventional operation of an injection molding system 100. They may, for example be, 210°C. This is over 30°C ( ⁇ 1 8%) above the melting temperature of polyoxymethylene (POM) Tm.
  • the mold contact temperature T3 and the applied molding pressure P are unusually low compared to conventional operation of an injection molding system 100.
  • the mold contact temperature T3 may be 80°C.
  • the applied molding pressure P may be 80MPa.
  • polishing an exterior surface 22 of the molded plastic 10 to create a surface texture determined by exposed interstitial spaces 32 of the amorphous plastic 12 may comprise mechanical polishing.
  • the ejected molded plastic body 20 may be tumbled in a barrel with plastic grinding stones comprising, for example, unsaturated polymer resin with 600 mesh sand and calcium carbonate particles for 1 hour at 30 revolutions per minute.
  • the plastic grinding stones may be cone-shaped or frustoconically shaped plastic media.
  • the resulting direct product of the method 200 is the apparatus 2 which has a 'soft-touch' finish without having any additional coatings applied.
  • the apparatus 2 may be an exterior housing 302 for an electronic device 300 which is used without the addition of an additional coating.
  • suitable electronic device 300 examples include but are not limited to personal, mobile electronic devices and accessories for such devices. Such devices may, in some example, be hand-portable that is, sized to be carried within the palm of a user's hand.
  • suitable electronic device 300 examples include but are not limited laptop computers, tablet computers, computer peripheral devices, mobile cellular telephones, personal media players.
  • module' refers to a unit or apparatus that excludes certain parts/components that would be added by an end manufacturer or a user.
  • the apparatus 2 may be a module.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un appareil comprenant : un corps comprenant un thermoplastique semi-cristallin moulé par injection comprenant une première partie amorphe qui définit au moins une surface extérieure du corps et une seconde partie cristalline qui définit au moins un intérieur du corps ; la première partie amorphe comprenant des espaces interstitiels et une texture de surface de la surface extérieure du corps étant déterminée par des espaces interstitiels découverts.
EP14883064.9A 2014-02-18 2014-02-18 Appareil comprenant un thermoplastique moulé par injection et procédé Withdrawn EP3108724A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/072206 WO2015123812A1 (fr) 2014-02-18 2014-02-18 Appareil comprenant un thermoplastique moulé par injection et procédé

Publications (2)

Publication Number Publication Date
EP3108724A1 true EP3108724A1 (fr) 2016-12-28
EP3108724A4 EP3108724A4 (fr) 2017-10-11

Family

ID=53877502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14883064.9A Withdrawn EP3108724A4 (fr) 2014-02-18 2014-02-18 Appareil comprenant un thermoplastique moulé par injection et procédé

Country Status (2)

Country Link
EP (1) EP3108724A4 (fr)
WO (1) WO2015123812A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368995A (en) * 1965-08-03 1968-02-13 Teijin Ltd Fiberglass reinforced polyethylene terephthalate
US5104241A (en) * 1991-04-08 1992-04-14 The Torrington Company Polymer bearing cage with amorphous case
JPH06206235A (ja) * 1992-11-13 1994-07-26 Asahi Chem Ind Co Ltd ポリアセタール樹脂製薄肉成形体の製造方法
TWI318855B (en) * 2003-08-06 2009-12-21 Hon Hai Prec Ind Co Ltd Housing of portable electronic equipment and method of making same
EP1907196A2 (fr) * 2005-04-01 2008-04-09 Behr GmbH & Co. KG Procede de production d'une piece en plastique, et dispositif comportant cette piece en plastique
CN101407098A (zh) * 2007-10-12 2009-04-15 深圳富泰宏精密工业有限公司 模具及应用该模具成型成型品的方法
CN201733527U (zh) * 2010-04-29 2011-02-02 广东长虹电子有限公司 一种遥控器

Also Published As

Publication number Publication date
EP3108724A4 (fr) 2017-10-11
WO2015123812A1 (fr) 2015-08-27

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