JPH01301318A - Extrusion foam molding method for thermoplastic resin - Google Patents
Extrusion foam molding method for thermoplastic resinInfo
- Publication number
- JPH01301318A JPH01301318A JP63133702A JP13370288A JPH01301318A JP H01301318 A JPH01301318 A JP H01301318A JP 63133702 A JP63133702 A JP 63133702A JP 13370288 A JP13370288 A JP 13370288A JP H01301318 A JPH01301318 A JP H01301318A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- gear pump
- helical gear
- die
- extrusion
- 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.)
- Granted
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 27
- 238000010097 foam moulding Methods 0.000 title claims description 6
- 229920005992 thermoplastic resin Polymers 0.000 title claims description 5
- 229920005989 resin Polymers 0.000 claims abstract description 48
- 239000011347 resin Substances 0.000 claims abstract description 48
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004088 foaming agent Substances 0.000 claims abstract description 10
- 238000005187 foaming Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract description 12
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 230000009467 reduction Effects 0.000 abstract 1
- 239000004793 Polystyrene Substances 0.000 description 11
- 229920002223 polystyrene Polymers 0.000 description 11
- 239000004604 Blowing Agent Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002667 nucleating agent Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical class CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920006327 polystyrene foam Polymers 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 241000209035 Ilex Species 0.000 description 1
- 235000003332 Ilex aquifolium Nutrition 0.000 description 1
- 235000002296 Ilex sandwicensis Nutrition 0.000 description 1
- 235000002294 Ilex volkensiana Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 description 1
- 229940063655 aluminum stearate Drugs 0.000 description 1
- 239000010975 amethyst Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 1
- 229910001864 baryta Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 235000010338 boric acid Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- NEHMKBQYUWJMIP-NJFSPNSNSA-N chloro(114C)methane Chemical compound [14CH3]Cl NEHMKBQYUWJMIP-NJFSPNSNSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- SHFGJEQAOUMGJM-UHFFFAOYSA-N dialuminum dipotassium disodium dioxosilane iron(3+) oxocalcium oxomagnesium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Na+].[Na+].[Al+3].[Al+3].[K+].[K+].[Fe+3].[Fe+3].O=[Mg].O=[Ca].O=[Si]=O SHFGJEQAOUMGJM-UHFFFAOYSA-N 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 239000004795 extruded polystyrene foam Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical class CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Chemical class CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000008117 stearic acid Chemical class 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
- B29C48/37—Gear pumps
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
- B29C48/387—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a gear pump
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/535—Screws with thread pitch varying along the longitudinal axis
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/57—Screws provided with kneading disc-like elements, e.g. with oval-shaped elements
-
- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C2037/96—Filters
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ポリスチレンペーパー（ＰＳＰ）−？合成木
材等のスチレン系樹脂の発泡成形品を製造する押出発泡
成形法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides polystyrene paper (PSP)-? This invention relates to an extrusion foam molding method for producing foam molded products of styrene resin such as synthetic wood.
押出機を用い、スクリューにより可塑化溶融された発泡
剤を含有する熱可塑性樹脂を、押出機内の樹脂通路に連
結したダイより低圧域に押し出して合成木材やＰＳＰｔ
ｌ−製造することが行われている。Using an extruder, thermoplastic resin containing a foaming agent is plasticized and melted by a screw and extruded into a low pressure region through a die connected to a resin passage in the extruder to produce synthetic wood or PSPt.
l- is being manufactured.
この押出発泡成形法において、樹脂温度をさほど上昇さ
せないで押出圧力全高め発泡剤と溶融樹脂との混合を良
好とするために第１図に示すように押出機とダイの樹脂
通路にギヤーポンプを付設することが提案されている（
％公開４８−４２４６０号、特開昭６２−２６８６２２
号、特開昭５８−６３４３１号）。必要によう、ギヤー
ポンプとダイの間に静止混合機を直列に配設することも
６．６（４１１ｓ ｓ−ｓ ３４ ａ ｔ％）。In this extrusion foam molding method, a gear pump is attached to the resin passage of the extruder and die as shown in Figure 1 in order to fully increase the extrusion pressure without raising the resin temperature too much and improve mixing of the foaming agent and molten resin. It is proposed to do (
% Publication No. 48-42460, Japanese Patent Publication No. 62-268622
No., Japanese Patent Publication No. 58-63431). If necessary, a static mixer may be arranged in series between the gear pump and the die.6.6 (411s ss 34 at%).
この種の押出装置のＷ造は、第１図に示す構造である。The W structure of this type of extrusion device is shown in FIG.
図中、１は押出機、２はギヤーポンプ、３は静止混合機
、４はダイ（図示はサーキュラ−ダイ）、５は押し出さ
れた円筒状シート、６は樹脂粒供給用ポツパー、７はス
クリュー、８は発泡剤供給パイプ、９は樹脂通路である
。In the figure, 1 is an extruder, 2 is a gear pump, 3 is a static mixer, 4 is a die (circular die shown), 5 is an extruded cylindrical sheet, 6 is a popper for supplying resin particles, 7 is a screw, 8 is a foaming agent supply pipe, and 9 is a resin passage.
ホッパーより供給された樹脂粒は、押出機により溶融可
塑化され、押出機の途中に設けられた発泡剤供給パイプ
より供給された揮発性膨脹剤と混合され、樹脂通路を経
てギヤーポンプで更に昇圧され、静止混合機、ダイを経
て大気圧中に放出され、発泡体となる。The resin particles supplied from the hopper are melted and plasticized by an extruder, mixed with a volatile expanding agent supplied from a blowing agent supply pipe installed in the middle of the extruder, and further pressurized by a gear pump through a resin passage. , a static mixer, and a die before being discharged into atmospheric pressure to form a foam.
ギヤーポンプの昇圧により樹脂の押出圧力は例えば３０
〜１００にダ／６ｄＧから２００〜３００陽／ｄＧと急
激に高められる。静止混合機（スクリーン）で押出圧力
は２０〜３５憾減少したのち、ダイより大気圧（Ｏｋｆ
／ｉＧ＞中に放出される。By increasing the pressure of the gear pump, the extrusion pressure of the resin is, for example, 30
It increases rapidly from ~100 da/6dG to 200-300 da/dG. After the extrusion pressure is reduced by 20 to 35 degrees using a static mixer (screen), the extrusion pressure is reduced to atmospheric pressure (Okf) from the die.
/iG>.
発泡剤が加熱分解型発泡剤であるときは、樹脂粒内に含
有させてホッパーより供給されるので、発泡剤供給パイ
プ８は不要である。When the blowing agent is a thermally decomposable blowing agent, the blowing agent supply pipe 8 is not necessary because it is contained in the resin particles and supplied from the hopper.
この種のギヤーポンプ２の歯車１０．１０’は第３図イ
および口に示すように平歯車（５ｐｕｒ ）タイプのも
のであった。The gears 10 and 10' of this type of gear pump 2 were of the spur gear (5pur) type, as shown in FIG.
このギヤーポンプを付設した押出装置は生に発泡しない
ヤーン・シートの成形に使用されており、ポリプロピレ
ン、高密度ポリエチレン、直鎖線状ポリエチレン等のポ
リオレフィン樹脂のシートの成形やポリアミドのヤーン
の製造に使用されている。This extrusion equipment equipped with a gear pump is used to form raw, unfoamed yarn sheets, and is used to form sheets of polyolefin resins such as polypropylene, high-density polyethylene, and linear polyethylene, and to produce polyamide yarns. ing.
本発明者等は、ポリスチレンの押出発泡シートの製造装
置にギヤーポンプを付加し、吐出能力を上げる試みを行
った。発泡シートｎ造においてはダイ出口の樹脂温度を
１６５℃以下に設定しないと発泡シートの気泡が独立気
泡とならず、シート強度の低下をもたらす。ギヤーポン
プを用いると押出機内の樹脂圧力を下げることが可能と
なり、押出機内での樹脂温度を抑制することができ、結
果的には、吐出量を上げ得ることを確認した。The present inventors added a gear pump to a manufacturing apparatus for extruded polystyrene foam sheets in an attempt to increase the discharge capacity. When making a foamed sheet, unless the resin temperature at the die outlet is set to 165° C. or lower, the cells in the foamed sheet will not become closed cells, resulting in a decrease in sheet strength. It was confirmed that the use of a gear pump made it possible to lower the resin pressure within the extruder, suppress the resin temperature within the extruder, and, as a result, increase the discharge amount.
しかしながら、ギヤーポンプの歯車が平歯車のとき、得
られる発泡体シートの肉厚分布のふれが大きいという問
題を生じた。即ち、単位時間当りの樹脂吐出量の押出方
向における変動幅が大きいことが原因と思われる。更に
、得られる発泡体シートの曲げ強度、外観等のバラツキ
も著しい結果となった。However, when the gear of the gear pump is a spur gear, a problem arises in that the thickness distribution of the obtained foam sheet varies greatly. That is, it seems that the cause is that the amount of resin discharged per unit time fluctuates widely in the extrusion direction. Furthermore, the resulting foam sheets had significant variations in bending strength, appearance, etc.
本発明者等はこの問題を鋭意検討した結果、これは、第
３図（イ）に示す点Ａの位置において、樹脂圧力が断続
的にかつ、急激に低下することが局部的に起こり、溶融
樹脂中の発泡剤が一部気化し、溶融樹脂の流れを変動さ
せることによるものと考えられる。As a result of intensive investigation into this problem, the inventors of the present invention found that this occurs because the resin pressure locally and intermittently decreases rapidly at the point A shown in Figure 3 (a), causing the melt to melt. This is thought to be due to the foaming agent in the resin partially vaporizing and causing the flow of the molten resin to fluctuate.
本発明においては、従来、平歯のギヤーポンプを付設し
た場合は、吐出量の変動が大きく、得られる発泡体シー
トの肉厚分布のふれ幅が大きくなるのをヘリカルギヤー
を用いることによって、この肉厚分布のふれ幅を小さく
し所期の目的を得ることにある。In the present invention, the use of a helical gear eliminates the large variation in the discharge amount and the wide variation in the wall thickness distribution of the obtained foam sheet when a spur gear pump is conventionally attached. The purpose is to reduce the deviation of the thickness distribution and achieve the desired purpose.
その理由は、へりカルギヤーを用いることにより、第３
図（イ）Ｋ示す点Ａの位置に於ける樹脂圧力の断続的な
気解放が連続化し、これによって溶融樹脂中の発泡剤の
気化が防止できることによるものと考えられる。The reason is that by using a helical gear, the third
This is thought to be due to the fact that the intermittent release of the resin pressure at the position of point A shown in Figure (a) K becomes continuous, thereby preventing the foaming agent in the molten resin from vaporizing.
本発明においては、平歯車のギヤーポンプの代りに、螺
旋状（ヘリカル）歯車を２つ以上有するヘリカルギヤー
ポンプを用いる。このヘリカルギヤーポンプを用いる効
果は熱可塑性樹脂として重量平均分子ｆｔ （Ｍｗ ）
が２．５ Ｘ １０５〜３．７ Ｘ １０’の高分子量
ポリスチレ／を用いるときに特に顕著である。In the present invention, a helical gear pump having two or more helical gears is used instead of a spur gear pump. The effect of using this helical gear pump is the weight average molecular weight ft (Mw) of thermoplastic resin.
This is particularly noticeable when using high molecular weight polystyrene/with a ratio of 2.5 x 105 to 3.7 x 10'.
即ち、本発明は、押出機とダイとの間の樹脂通路に、ヘ
リカルギヤーポンプを配置した樹脂押出成形装置を用い
、スクリューにより可塑化溶融された発泡剤を含有する
スチレン系樹脂をヘリカルギヤーポンプによｐ撹拌し、
次いでダイより樹脂通路内の圧力よりも低圧域に押出し
て発泡させることを特徴とする熱可塑性樹脂の押出発泡
成形法を提供するものである。That is, the present invention uses a resin extrusion molding apparatus in which a helical gear pump is disposed in a resin passage between an extruder and a die, and a styrene resin containing a foaming agent that has been plasticized and melted by a screw is pumped by the helical gear pump. p stir,
The present invention provides an extrusion foam molding method for thermoplastic resin, which is characterized in that the resin is then extruded from a die to a pressure region lower than the pressure in the resin passage to cause foaming.
ヘリカルギヤーポンプ２′としては第２図に示すものが
用いられる。図において、９は樹脂導入通路、ｌＯｌ
１０′は螺旋状歯車、１１は駆動軸、１２はベヤリング
である。The helical gear pump 2' shown in FIG. 2 is used. In the figure, 9 is a resin introduction passage, lOl
10' is a helical gear, 11 is a drive shaft, and 12 is a bearing.
スチレン系樹脂としては、数平均分子ｔ（Ｍｗ＋が１．
８ Ｘ １０’〜３．７ Ｘ １０５、数平均分子量（
扇〕が６．ＯＸ １０’〜１．２ Ｘ １０’のポリス
チレン、スチレン・ブタジェン・スチレンブロック共重
合体、スチレン・ブタジェン・スチレン共重合体、スチ
レン・アクリロニトリル共重合体、スチレン・メチルメ
タクリレート共重合体、スチレン・α−メチルスチレン
共重合体、スチレン・α−メチルスチレン・アクリロニ
トリル共重合体等が単独で、または二ね以上併用して用
いられる。As a styrene resin, the number average molecular t (Mw+ is 1.
8 X 10' to 3.7 X 105, number average molecular weight (
Fan] is 6. OX 10' to 1.2 -Methylstyrene copolymer, styrene/α-methylstyrene/acrylonitrile copolymer, etc. may be used alone or in combination of two or more.
このスチレン系樹脂の一部（５０ｍ［ｊｔ％以下）ヲホ
リス二二しンエーテル、エチレ７− 酢酸ビニル共重合
体、エチレン・メタクリル酸共重合体の曾属塩（Ｚｎ
ＸＫ、Ｎａ 、Ｌｌ 、Ａ／ ）、エチレン
・プロピレン共重合体ゴム等に置き代えてもよい。A part of this styrene resin (50 m [jt% or less)] was mixed with hollys 22 ether, ethylene 7-vinyl acetate copolymer, and ethylene/methacrylic acid copolymer salt (Zn).
XK, Na, Ll, A/), ethylene/propylene copolymer rubber, etc. may be substituted.
樹脂の溶融粘度は５．Ｑ Ｑ Ｏ〜２ Ｑ、ＯＱ Ｏボ
イズ、樹脂の押出圧力は３０〜１００ ｋｆ／−、ヘリ
カルギヤーポンプの出口圧力は１５０〜３００初／ｍが
一般である。螺旋状歯車の喰み合う歯車の角度は５〜２
０度である。The melt viscosity of the resin is 5. Generally, the extrusion pressure of the resin is 30 to 100 kf/-, and the outlet pressure of the helical gear pump is 150 to 300 kf/m. The angle of meshing gears in a spiral gear is 5 to 2.
It is 0 degrees.
発泡剤としては、ブタン、ヘプタン、ペンタン、ジクロ
ロシフミロメタン、トリクロロモノ７０ロメタン、ジク
ロロシフ０ロエタン、塩化メチル等の揮発性膨張剤；ア
ゾシカーボン酸アミド等の熱分解型発泡剤が使用される
。As the blowing agent, a volatile blowing agent such as butane, heptane, pentane, dichlorosifumilomethane, trichloromono70lomethane, dichlorosifuloethane, methyl chloride, or the like; or a thermally decomposable blowing agent such as azocycarbonic acid amide is used.
スチレン系樹脂１００重量部に対する使用量は、揮発性
膨張剤で２〜１５重量部、熱分解型発泡剤で１〜５重量
部である。高発泡シートを得るには揮発性膨張剤のが好
ましい。The amount used for 100 parts by weight of the styrene resin is 2 to 15 parts by weight of the volatile expansion agent and 1 to 5 parts by weight of the thermally decomposable blowing agent. In order to obtain a highly foamed sheet, volatile swelling agents are preferred.
これら樹脂、発泡剤の他に、核剤を０．１〜３重量係、
顔料０．１〜３重量壬、高級脂肪酸を０．０５〜１５〜
１重量部で使用してもよい。核剤は、発泡体のセル径を
均一に調整するのに役立つものでメジ、タルク、炭酸マ
グネシウム、パーライト、硅酸カルシウム、炭酸カルシ
ウム、酸化硅素、バライタ、バーミキュライト等の無機
系核剤、クエン酸、酒石酸、硼酸、蓚酸等の有機酸が用
いられる。高級脂肪酸の金属塩としては、炭素数が１２
〜２２の高級脂肪酸、例えばカプリン酸、ステアリン酸
、バルミチン酸等の金属塩（ＣａＸＮａＸＫ。In addition to these resins and foaming agents, add 0.1 to 3 parts by weight of a nucleating agent.
Pigment: 0.1 to 3 by weight, higher fatty acid: 0.05 to 15
It may be used in an amount of 1 part by weight. Nucleating agents are useful for uniformly adjusting the cell diameter of the foam, and include inorganic nucleating agents such as amethyst, talc, magnesium carbonate, perlite, calcium silicate, calcium carbonate, silicon oxide, baryta, vermiculite, and citric acid. Organic acids such as , tartaric acid, boric acid, and oxalic acid are used. As metal salts of higher fatty acids, the number of carbon atoms is 12.
~22 higher fatty acids, such as metal salts of capric acid, stearic acid, valmitic acid, etc. (CaXNaXK.
ＬｉＸＺｎＸＡＪ）があげられる。特にステアリン酸亜
鉛、ステアリン酸アルミニウム及びステアリン酸カルシ
ウムが好適である。LiXZnXAJ). Particularly suitable are zinc stearate, aluminum stearate and calcium stearate.
この高級脂肪酸の金属塩は、シートを押出成形する際の
加工性を向上させるとともに、発泡体シートの柔軟性を
向上する。このヘリカルギヤーポンプを用いることによ
り、ギヤーポンプを付設しないときよりも樹脂温度の上
昇なしに５〜２０％高い吐出量でも発泡させることがで
き、得られたシートは肉厚変動も小さく、又、曲げ強度
、外観等のバラツキも全く問題無いものであった。This metal salt of higher fatty acid improves the processability during extrusion molding of the sheet and also improves the flexibility of the foam sheet. By using this helical gear pump, it is possible to foam at a discharge rate that is 5 to 20% higher than when a gear pump is not attached, without increasing the resin temperature, and the resulting sheet has small wall thickness fluctuations, and has a high bending strength. There were no problems with variations in appearance, etc.
以下に、第１図の構成に於けるギヤーポンプにヘリカル
ギヤーを用いた場合を実施例、ギヤーポンプに平歯車を
用いた場合を比較例−１、ギヤーポンプを用いなかった
場合を比較例−２として、本発明の詳細な説明する。Below, the case where a helical gear is used for the gear pump in the configuration of FIG. The present invention will be described in detail.
押出機として、スクリュー ６５ ｍ ｇ ＸＬ／ Ｄ
３３のダルメージ付２ステージスクリューを内蔵する
押出機を用いた。As an extruder, screw 65 mg XL/D
An extruder with a built-in two-stage screw with 33 dullages was used.
ギヤーポンプとしては、実施例においては、第２図に示
すヘリカルギヤーポンプ（ギヤーの歯数！４枚、ヘリカ
ルギヤーの標線角７度、容［１０゜２ ｃｍｉ ／ ｖ
ｅｖ ）を用い、又、比較例−１においては第３図に示
す平歯車を有するギヤーポンプ（ギヤーの歯数３０枚、
容量５０ ｄ ／ ｒｅＶ ）を用いた。In the embodiment, the gear pump is a helical gear pump shown in FIG.
ev), and in Comparative Example-1, a gear pump having a spur gear shown in Fig. 3 (30 gear teeth,
A capacitance of 50 d/reV) was used.
父、比較例−２においては、ギヤーポンプを用いずにポ
リスチレン発泡シートの押出成形を実施した。In Comparative Example 2, a polystyrene foam sheet was extruded without using a gear pump.
ダイとしては、口径が７５■２のサーキュラダイを用い
た。As the die, a circular die with a diameter of 75mm2 was used.
樹脂としては次の高分子量ポリスチレン（イ）と低分子
量ポリスチレン（ロ）を用いた。As the resins, the following high molecular weight polystyrene (a) and low molecular weight polystyrene (b) were used.
（イ）高分子量ポリスチレン
Ｍｗ ３．５ Ｘ １０’
Ｍｎ １．ＯＸ １０’
（ロ）低分子量ポリスチレン
ＭＷ ２．４ Ｘ １０’
Ｍｉ ７．２ Ｘ １０４
前記押出機のホッパーよりポリスチレン粒を供給し、押
出機の圧縮ゾーンの温度をＣ，２２０℃、Ｃ，２２０℃
、Ｃ，１５０℃、（’、１５０℃、ダイ温度を１５０℃
と設定し、押出機の途中（Ｃ，部）に設けた発泡剤供給
ノズルよりブタンをポリスチレンの３重量係となるよう
に供給して肉厚２簡のポリスチレンペーパー（発泡倍″
＄１０倍）の製造を行った。(a) High molecular weight polystyrene Mw 3.5 x 10' Mn 1. OX 10' (b) Low molecular weight polystyrene MW 2.4 X 10' Mi 7.2 ℃
, C, 150℃, (', 150℃, die temperature 150℃
Then, from the blowing agent supply nozzle installed in the middle of the extruder (section C), butane was supplied so that it was equal to 3 parts by weight of polystyrene, and a polystyrene paper with a wall thickness of 2 sheets (expansion ratio
10 times).
温度制御が効果的に働き、独立気泡のポリスチレンペー
パーが得られる、ダイ出口での樹脂温度が１６０℃とな
るときの押出量及び押出方向の肉厚変動は次の表１の通
りであった（第４図も参照）。The extrusion amount and wall thickness variation in the extrusion direction when the resin temperature at the die exit was 160°C, where temperature control worked effectively and closed-cell polystyrene paper was obtained, were as shown in Table 1 below ( (See also Figure 4).
（以下余白）
表 １
（○良。Δやや変動あシ。Ｘ不良。）
へリカルギャーポンプを付設することにより、高分子量
のポリスチレンにおいてはギヤーポンプを付設しないと
きよりも１７．９％吐出量を上昇させることができ生産
性が向上することが理解される。(Leaving space below) Table 1 (○ Good. Δ Slightly fluctuating foot. It is understood that productivity can be improved.
低分子量ポリスチレンの場合においては、吐出量の向上
率は約８．２％である。In the case of low molecular weight polystyrene, the rate of improvement in discharge rate is about 8.2%.
第４図は、高分子量ポリスチレンを用いた場合について
、ギヤーポンプを用いた場合と用いない場合における押
出方向の肉厚変動を１５秒間隔に調査した結果である。FIG. 4 shows the results of investigating wall thickness variations in the extrusion direction at 15 second intervals when using and not using a gear pump when using high molecular weight polystyrene.
ギヤーポンプを付設しない（比較例２）場合や平歯のギ
ヤーポンプを付設（比較例１）した場合の吐出量の変動
幅と比較し、ヘリカルギヤーポンプを付設（実施例）し
たときの吐出量の変動幅は小さいことが理解される。The range of variation in discharge volume when a helical gear pump is attached (example) compared to the range of variation in discharge volume when a gear pump is not attached (comparative example 2) or when a spur tooth gear pump is attached (comparative example 1). is understood to be small.
ヘリカルギヤーポンプを従来の発泡押出成形機に付設す
ることにより、
（１）吐出量を増大させ、発泡体シートの生産性を向上
させることができる。By attaching a helical gear pump to a conventional foam extrusion molding machine, (1) the discharge amount can be increased and the productivity of foam sheets can be improved.
（２）吐出量の押出方向における変動幅が小さいので得
られる発泡体シートの肉厚変動幅も小さい。(2) Since the fluctuation range of the discharge amount in the extrusion direction is small, the thickness fluctuation range of the obtained foam sheet is also small.
利点がある。There are advantages.
第１図は樹脂押出成形装置の平面図、第２図はヘリカル
ギヤーポンプの一部を切シ欠いた斜視図、＃Ｊ３因イは
平歯車を備えたギヤーポンプの平面図、第３−口は平歯
車を備えたギヤーポンプの稠１ｊ面図（図面では平歯車
の歯は省略）、第４図はポリスチレン発泡シートの押出
方向の肉厚変化を示す図である。
特許出願人 三菱油化バーディッシェ株式会社代理人
弁理士 長 谷 正 久
代理人 弁理士 山 本 隆 也
第１図
１ 才甲 ｄ二 Ａす気゛
２ キ′ヤーボレフ。
２′ ヘリカル代°゛ヤーボシフ・
第２図 ４タイ
第３図（イ）
第３図（口２Figure 1 is a plan view of a resin extrusion molding device, Figure 2 is a partially cutaway perspective view of a helical gear pump, #J3 is a plan view of a gear pump equipped with a spur gear, and No. 3 is a flat view. FIG. 4 is a perspective view of a gear pump equipped with gears (the teeth of the spur gear are omitted in the drawing), and is a diagram showing changes in the wall thickness of a polystyrene foam sheet in the extrusion direction. Patent applicant Mitsubishi Yuka Berdische Co., Ltd. Agent
Patent Attorney Masahisa Hase Agent Patent Attorney Takaya Yamamoto 2' Helical allowance °゛Yarboschiff Fig. 2
Claims (1)
ーポンプを配置した樹脂押出成形装置を用い、スクリュ
ーにより可塑化溶融された発泡剤を含有するスチレン系
樹脂をヘリカルギヤーポンプにより撹拌し、次いでダイ
より樹脂通路内の圧力よりも低圧域に押出して発泡させ
ることを特徴とする熱可塑性樹脂の押出発泡成形法。 ２）、スチレン系樹脂の数平均分子量（＠Ｍｎ＠）が６
．０×１０＾４〜１．２×１０＾５、重量平均分子量（
＠Ｍｗ＠）が１．８×１０＾５〜３．７×１０＾５であ
ることを特徴とする請求項第１項記載の押出発泡成形法
。[Claims] 1) Using a resin extrusion molding device in which a helical gear pump is disposed in the resin passage between the extruder and the die, styrene resin containing a foaming agent that has been plasticized and melted by a screw is helically heated. An extrusion foam molding method for thermoplastic resin, which is characterized by stirring with a gear pump and then extruding from a die to a pressure region lower than the pressure in the resin passage to cause foaming. 2), the number average molecular weight (@Mn@) of the styrene resin is 6
．． 0 x 10^4 - 1.2 x 10^5, weight average molecular weight (
2. The extrusion foam molding method according to claim 1, wherein @Mw@) is 1.8 x 10^5 to 3.7 x 10^5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63133702A JP2573656B2 (en) | 1988-05-31 | 1988-05-31 | Extrusion foam molding of thermoplastic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63133702A JP2573656B2 (en) | 1988-05-31 | 1988-05-31 | Extrusion foam molding of thermoplastic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01301318A true JPH01301318A (en) | 1989-12-05 |
| JP2573656B2 JP2573656B2 (en) | 1997-01-22 |
Family
ID=15110892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63133702A Expired - Fee Related JP2573656B2 (en) | 1988-05-31 | 1988-05-31 | Extrusion foam molding of thermoplastic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2573656B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998039152A1 (en) * | 1997-03-05 | 1998-09-11 | Torsten Herrmann | Extrusion device |
-
1988
- 1988-05-31 JP JP63133702A patent/JP2573656B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998039152A1 (en) * | 1997-03-05 | 1998-09-11 | Torsten Herrmann | Extrusion device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2573656B2 (en) | 1997-01-22 |
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