KR890700630A - 밀폐된 기포를 가진 알케닐 방향족 합성수지 발포체를 압출시키는 방법 - Google Patents

밀폐된 기포를 가진 알케닐 방향족 합성수지 발포체를 압출시키는 방법

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KR890700630A
KR890700630A KR1019880701669A KR880701669A KR890700630A KR 890700630 A KR890700630 A KR 890700630A KR 1019880701669 A KR1019880701669 A KR 1019880701669A KR 880701669 A KR880701669 A KR 880701669A KR 890700630 A KR890700630 A KR 890700630A
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blowing agent
cfc
resin
ethane
propane
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KR1019880701669A
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KR950014239B1 (en
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더블유.수 경
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리챠드 지.워터맨
더 다우 케미칼 캄파니
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    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/149—Mixtures of blowing agents covered by more than one of the groups C08J9/141 - C08J9/143
    • 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
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • 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
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • 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
    • B29C44/505—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 extruding the compound through a flat die
    • 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
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/82—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
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/127—Mixtures of organic and inorganic blowing agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/143—Halogen containing compounds
    • C08J9/144—Halogen containing compounds containing carbon, halogen and hydrogen only
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
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    • B29C2948/92019—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92466—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
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    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/046—Condition, form or state of moulded material or of the material to be shaped cellular or porous with closed cells
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    • C08J2203/00—Foams characterized by the expanding agent
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    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
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    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
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    • C08J2325/10—Copolymers of styrene with conjugated dienes

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  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

내용 없음.

Description

밀폐된 기포를 가진 알케닐 방향족 합성수지 발포체를 압출시키는 방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음

Claims (15)

  1. (a) 알케닐 방향족 합성수지를 열 가소화시키고, (b) 가소화된 수지 및 발포제를 압력 PM(이 압력은 알케닐 방향족 합성수지와 발포제의 혼합물에서 발포제의 평형 증기압 보다 크다)에서 유지되는 유입구를 가진 혼합장치내로 도입시키고, (c) 혼합물을 냉각창치를 통해 통과시킨 후, (d) 냉각된 혼합물을 다이 유입구 압력이 P (이 압력은 대기압 보다 크다)인 다이를 통해 통과시키는 단계를 포함하며, 여기서 발포체 표면의 질은 혼합기의 유입구로 부터 다이의 유입구까지의 압력강하 ΔP를, 제공된 수지와 발포체 혼합물에 대하여 실험적으로 예비측정된 최소 빛 임계 압력강하 ΔPc보다 크거나 이와 동등한 압력강하 조심스럽게 유지시켜 조절함으로써, 평균 기포크기가 약 0.05 내지 약 3.5mm이고, 밀도가 약 1.0 내지 약 5.0 lb/ft3(pcf)이며, 최소 횡단면 두께가 1/2in이고, 최소 횡단면적이 8 in2인, 밀폐된 기포를 갖는 알케닐 방향족 합성수지-압출 발포체를 제조하는 방법.
  2. 제1항에 있어서, 단계(b)에서의 발포제 조성이 (1) CFC-12, CFC-124, CFC-134A, CFC-142B, CFC-143A 및 이의 혼합물, (2) (1)의 CFC들 중에서 단독으로 하나, 또는 약 6% 이하의 CO2와의 혼합물, (3) 악 5 내지 약 97%의 EtC1 및 약 3 내지 약 45%의 CO2,(4) CFC-12, CFC-142B 및 이의 혼합물중에서 선택된 CFC 약 90% 이하를 함유하는 (3)의 발포제, (5) 약 19 내지 약 97% EtC1 및 약 3 내지 약 45%의 CO2, (6) CFC-12, CFC-142B 또는 이의 혼합물중에서 선택된 CFC 약 90% 이하를 함유하는 (5)의 발포제, (7) CFC-12와, CFC-134A, CFC-124 및 CFC-143A로 이루어진 그룹중에서 선택된 하나 이상의 CFC의 혼합물 약 90% 이하를 함유하는 (3)의 발포제, (8) CFC-12와, CFC-134A, CFC-124 및 CFC-143A로 이루어진 그룹중에서 선택된 하나 이상의 CFC와의 혼합물 약 90% 이하를 함유하는 (5)의 발포제, (9) 약 20 내지 약 97%의 EtC1 및 약 3 내지 약 90%의 CFC-l2, CFC-l42B, CFC-l34A, CFC-124, CFC-143A 및 이의 혼합물, (10) 약 3% 이하의 CO2를 함유하는 (9)의 발포제, (11) 약 40% 이하의 CFC-22를 함유하는 (1)의 발포제, (l2) 약 5.5% 이하의 CO2를 함유하는 (ll)의 발포제, (13) 약 50% 이하의 에탄을 함유하는 (1)의 발포제, (14) 약 6% 이하의 CO2를 함유하는 (13)의 발포제, (15) 약 50% 이하의 프로판을 함유하는 (1)의 발포제, (16) 약 6% 이하의 CO2를 함유하는 (15)의 발포제, (17) (1)의 발포제 약 90% 이하를 함유하며, 추가로 에탄 약 50% 이하를 함유하는 (5)의 발포제, (18) (1)의 발포제 약 90% 이하를 함유하며, 추가로 프로판 약 50% 이하를 함유하는 (5)의 발포제, (19) (1)의 발포제 약 90% 이하를 함유하며, 추가로 CFC-22 약 50% 이하를 함유하는 (5)의 발포제, (20) CFC-22,(21) 약 5% 이하의 CO2를 함유하는 (20)의 발포제, (22) 약 50% 이하의 에탄을 함유하는 (20)의 발포제. (23) 약 50% 이하의 에탄을 함유하는 (21)의 발포제, (24) 약 50% 이하의 프로판을 함유하는 (20)의 발포제,(25) 약 50% 이하의 프로판을 함유하는 (21)의 발포제, (26) 약 20 내지 약 90%의 EtC1 및 약 40%의 EtC1 및 약 40% 이하의 CO2,(27) 약 20 내지 약 90%의 EtC1 및 약 70% 이하의 에탄, (28) 약 70% 이하의 에탄을 함유하는 (26)의 발포제, (29) 약 20 내지 약 90%의 EtC1 및 약 70% 이하의 프로판, (30) 약 70% 이하의 프로판을 함유하는 (26)의 발포제, (31) 약 20 내지 약 90%의 EtCl 및 약 70% 이하의 CFC-22,(32) 약 70% 이하의 CFC-22를 함유하는 (26)의 발포제, (33) 악 70% 이하의 에탄을 함유하는 (31)의 발포제, (34) 약 70% 이하의 프로판을함유하는 (31)의 발포제. (35) H2O: (36) 약 0.4 내지 약 99.9%의 H2O 및 약 0.1 내지 약 50%의 CO2, (37) (1)의 발포제 약 99.5% 이하를 함유하는 (36)의 발포제. (38) 약 0.4 내지 약 99.9%의 H2O 및 약 60% 이하의 CFC-22, (39) 약 60% 이하의 CFC-22를 함유하는 (36)의 발포제. (40) 에탄, 프로판, EtC1 및 이의 혼합물로 이루어진 그룹중에서 선택된 발포제 약 60% 이하를 함유하는 (38)의 발포제, (41) 약 0.4 내지 약 99.9%의 H2O 및 약 60% 이하의 에탄, (42) 약 60% 이하의 에탄을 함유하는 (36)의 발포제,(43) 약 0.4 내지 약 99.9%의 H2O 및 약 60% 이하의 프로판, (44) 약 60% 이하의 프로판을 함유하는 (36)의 발포제, (45) 약 0.4 내지 약 99.9%의 H2O 및 약 60% 이하의 EtCl, 및 (46) 약 60% 이하의 EtC1를 함유하는 (36)의 발포제의 조성(여기서, 모든 %는 발포제의 총중량을 기준으로 한 중량%이다)중의 하나인 방법.
  3. 제1항에 있어서, 알케닐 방향족 합성수지가 폴리스티렌인 방법.
  4. 제1항에 있어서, 알케닐 방향족 합성수지가 총 수지 중량에 대해 약 0.1 내지 약 15중량%의 중합화된 아크릴산을 함유하는 스티렌/아크릴산 공중합체인 방법.
  5. 제1항에 있어서, 알케닐 방향족 합성수지가 이오노머성 스티렌/아크릴산 공중합체인 방법.
  6. 제1항에 있어서, 알케닐 방향족 합성수지가 총 수지 중량에 대해 약 0.1 내지 약 15중량%의 중합화된 아크릴산을 함유하는 이오노머성 스티렌/아크릴산 공중합체이고, 이온은 칼슘, 나트륨, 리튬, 칼륨, 마그네슘 및 이의 혼합물로 이루어진 그룹중에서 선택되는 방법.
  7. 제6항에 있어서, 단계(a)에서, 수지 100중량부당, 수산화칼슘, 수산화리튬, 수산화나트륨, 수산화칼륨, 산화 마그네슘 및 이의 혼합물로 이루어진 그룹중에서 선택된 중화제 약 0.1 내지 약 1중량부를 열 가소화된 수지에 가함으로써, 이오노머성 스티렌/아크릴산 공증합체용 이온을 제공하는 방법.
  8. 제6항에 있어서, 단계(a)에서, 수지 100중량부당, 수산화칼슘, 수산화리튬, 수산화나트륨, 수산화칼륨. 산화 마그네슘 및 이의 혼합물로 이루어진 그룹중에서 선택된 중화제 약 0.1 내지 약 0.6중량부를 열 가소롸된 수지에 가함으로써, 이오노머성 스티렌/아크릴산 공중합체용 이온을 제공하는 방법.
  9. 제1항에 있어서, 추가로, 단계(a) 후 및 단계(b)전에, 압력 조절장치를 통해 가소화된 수지를 통과시키는 단계를 포함하는 방법.
  10. 제l항의 방법에 마라 제조된, 압출된 알케닐 방향족 합성수지 발포체.
  11. 제1항에 있어서, 혼합장치의 온도를 저하시킴으로써 ΔP 값의 강하를 보정하는 방법.
  12. 제1항에 있어서. 혼합장치의 다이의 유입구 사이에 위치 하는 트로틀 밸브(throttle valve)를 부분적으로 폐쇄시킴으로써 ΔP값의 강하를 보정하는 방법.
  13. 제1항에 있어서, 발포제 농도를 감소시킴으로써 ΔP값의 강하를 보정하는 방법.
  14. 제1항에 있어서, 알케닐 방향족 합성수지를 혼합 장치내로 공급하는 속도를 증가시킴으로써 ♪P값의 강하를 보정하는 방법.
  15. 제1항에 있어서, ΔP값이 연속적으로 측정되고, ΔP값이 예정된 값 이하로 강하할 때마다 경계신호가 자동적으로 활성화되는 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR88701669A 1987-04-15 1988-12-15 A method of extruding an alkenyl aromatic synthetic resin foamed body having closed cells KR950014239B1 (en)

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