[특허]Coextrusion process and apparatus for manufacturing multi-layered flat films of thermoplastic materials

Coextrusion process and apparatus for manufacturing multi-layered flat films of thermoplastic materials 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B29F-003/04
출원번호	US-0280334 (1981-07-06)
우선권정보	DE-3025564 (1980-07-05)
발명자 / 주소	Dinter Peter (Hallgarten DEX) Kolbe Andreas (Wiesbaden DEX)
출원인 / 주소	Hoechst Aktiengesellschaft (Frankfurt am Main DEX 03)
인용정보	피인용 횟수 : 37 인용 특허 : 0

초록 ▼

Disclosed is a process for producing a multiple-layered sheet of film comprising at least two thermoplastic materials by coextrusion through a slot die, comprising the steps of heat plastifying a first, second, third and fourth thermoplastic material; joining a stream of the first heat plastified thermoplastic material and a stream of the second heat plastified thermoplastic material to form a first combined stream having a generally rectangular cross-section and having an upper layer of the first thermoplastic material and a lower layer of the second thermoplastic material mechnically anchored together by means of profiles formed on the contact surfaces of the two layers; joining a stream of the third heat plastified thermoplastic material and a stream of the fourth heat plastified thermoplastic material to form a similar second combined stream, reducing the width of the first and second combined stream; joining the first and second combined streams in edge-to-edge fashion in a single plane to form a composite stream; introducing the composite stream into the inlet channel of the slot die; coextruding the composite stream through the slot die to form a multiple layer film or sheet; and cooling the film or sheet. Also disclosed is an apparatus for carrying out this process.

대표청구항 ▼

A process for producing a multiple-layered sheet of film comprising at least two thermoplastic materials by coextrusion through a generally planar wide slot die, comprising the steps of: heat plastifying a first, second, third and fourth thermoplastic material; joining a stream of said first heat plastified thermoplastic material and a stream of said second heat plastified thermoplastic material to form a first combined stream having a generally rectangular cross-section and having an upper layer of said first thermoplastic material and a lower layer of said second thermoplastic material mechanically anchored together by means of profiles formed on the contact surfaces of the two layers, the width of said first combined stream being greater than one-half of the width of the inlet channel of the slot die; joining a stream of said third heat plastified thermoplastic material and a stream of said fourth heat plastified thermoplastic material to form a second combined stream having a generally rectangular cross-section and having an upper layer of said third thermoplastic material and a lower layer of said fourth thermoplastic material mechanically anchored together by means of profiles formed on the contact surfaces of the two layers, the width of said second combined stream being greater than one-half of the width of the inlet channel of the slot die; reducing the width of said first and second combined streams; joining said first and second combined streams in edge-to-edge fashion in a single plane to form a composite stream; introducing said composite stream into the inlet channel of the slot die; coextruding the composite stream through the slot die to form a generally planar multiple layer film or sheet wider than said inlet channel; and cooling the film or sheet. An adapter apparatus for producing a multiple-layered sheet of film comprising at least two thermoplastic materials by coextrusion through a slot die, comprising: means for joining a stream of a first heat plastified thermoplastic material and a stream of a second heat plastified thermoplastic material to form a first combined stream having a generally rectangular cross-section and having an upper layer of said first thermoplastic material and a lower layer of said second thermoplastic material mechanically anchored together by means of profiles formed on the contact surfaces of the two layers, the width of said first combined stream being greater than one-half of the width of the inlet channel of the slot extrusion die; means for joining a stream of a third heat plastified material and a stream of a fourth heat plastified thermoplastic material to form a second combined stream having a generally rectangular cross-section and having an upper layer of said third thermoplastic material and a lower layer of said fourth thermoplastic material mechanically anchored together by means of profiles formed on the contact surfaces of the two layers, the width of said second combined stream being greater than one-half of the width of the inlet channel of the slot extrusion die; means for reducing the width of said first and second combined streams; means for joining said first and second combined streams in edge-to-edge fashion in a single plane to form a composite stream; and means for introducing said composite stream into the inlet channel of the slot extrusion die.

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Coextrusion process and apparatus for manufacturing multi-layered flat films of thermoplastic materials 원문보기

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