Multi-layer blown-film extrusion die
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0803593
(1997-06-05)
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우선권정보 |
GB-0004127 (1996-02-27) |
발명자
/ 주소 |
- Bentivoglio Alfredo,CAX ITX L5J 2M6
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
10 인용 특허 :
4 |
초록
▼
This invention relates to a Multi-Layer Blown-Film Extrusion Die. An Extrusion Die is a key component of extrusion equipment, used in manufacture of Blown film for packaging industry. Although this Extrusion Die relates to production of five or more layers of blown films, it can also be used for pro
This invention relates to a Multi-Layer Blown-Film Extrusion Die. An Extrusion Die is a key component of extrusion equipment, used in manufacture of Blown film for packaging industry. Although this Extrusion Die relates to production of five or more layers of blown films, it can also be used for production of lesser number of layers. While in the conventional outside fed die, melt was to be conveyed around the die in a fanning-out configuration, in this invention the polymer melt is split into two streams, before being fanned or spread around the circumference. Polymer melt enters several spiral or helical grooves prior to joining the gap that enjoins melt with other layers of the melt streams. The dimensions of spiral grooves and lands are carefully calculated, keeping in view relevant factors such as melt viscosity, shear sensitivity temperature and pressure requirements etc.
대표청구항
▼
[ I claim:] [1.] Apparatus for producing multi-ply blown plastic film, by co-extrusion, wherein:the apparatus includes inner and outer walls that define an annular nozzle, through which liquid melt is ejected to form a bubble;the inner and outer walls also define an axially-long annular pre-nozzle c
[ I claim:] [1.] Apparatus for producing multi-ply blown plastic film, by co-extrusion, wherein:the apparatus includes inner and outer walls that define an annular nozzle, through which liquid melt is ejected to form a bubble;the inner and outer walls also define an axially-long annular pre-nozzle chamber, through which the melt is conveyed prior to emergence from the nozzle;the apparatus includes a set of die-components, which are arranged as a stack, and fixedly secured together;the apparatus includes respective systems of melt-conveying-channels in respect of each ply, for promoting a circumferentially-even distribution of the flow of melt in the annular pre-nozzle chamber;each system of channels is provided between adjacent upper and lower die-components of the stack;each channel in the system has a roof formed in the upper die-component and a floor formed in the lower die-component, the channels being configured as machined indentations in at least one of the floor and roof;in respect of each ply:the system of channels for that ply includes a respective set of helical grooves, which are so arranged that the melt passes through the helical grooves before entering the annular pre-nozzle chamber;the melt for that ply is fed in through a respective entry port;the entry port is at a radially outermost location with respect to the system of channels, and the system of channels is arranged for conveying the melt to the annular pre-nozzle chamber in a radially-inwards directional progression, towards the annular pre-nozzle chamber;the system of channels for that ply includes a left transfer-channel and a right transfer-channel, and a left spreader-channel and a right spreader-channel;the left and right spreader-channels are so arranged as to receive melt respectively from the left and right transfer-channels, and to convey the melt therefrom evenly to the helical grooves of that ply;the left and right transfer-channels are deep and narrow, and the cross-sectional configurations of the spreader-channels are correspondingly deep and narrow in regions of the spreader-channels that lie adjacent to the transfer-channels;in respect of each spreader-channel, the spreader-channel is so formed as to become gradually and progressively relatively shallower and circumferentially wider, as measured normal to the direction in which the melt flows from the respective transfer-channel to the helical-grooves;the helical-grooves have respective entry-mouths, and the spreader-channels include respective marginal portions, being the portions from which the melt passes directly to the entry-mouths of the helical grooves, and the marginal portions form a complete encirclement of the entry-mouths of the helical-grooves;the left spreader-channel and left transfer-channel are identical to the right spreader-channel and right transfer-channel, each spreader-channel providing half the said complete encirclement.
이 특허에 인용된 특허 (4)
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Dougherty Timothy Stephen (Norcross GA), Apparatus for extruding concentric plastic sheaths.
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Briggs Milton (York PA), Cross head die.
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Guillemette A. Roger (10 Pike St. West Warwick RI 02893), Extrusion system with balanced flow passage.
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Teutsch Erich O. (Pittsfield MA) Coyle Dennis J. (Clifton Park NY), Modular tubular extrusion head.
이 특허를 인용한 특허 (10)
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Wang,Lixiao, Biaxially oriented multilayer polymer tube for medical devices.
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York, Geoffrey; Shabudin, Esak, Co-injection moulding.
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Worley,Joseph C.; Patterson,Gene L., Die module for a crosshead extrusion system.
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Sensen, Klemens; Linkies, Juergen; Aus Dem Moore, Dieter; Rewwer, Reinmut; Bosse, Frank, Extruder die head.
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Chin, Albert; Chen, John; Wang, Lixiao; Sahatjian, Ronald; Wang, (Bruce) Yiqun, Medical device with extruded member having helical orientation.
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Spruell, Stephen, Method and apparatus for multi-stream metered extrusion.
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Spruell, Stephen Lee, Method and apparatus for multi-stream metered extrusion.
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Lareau, Raymond J., Selective surface modification of catheter tubing.
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Lareau, Raymond J., Selective surface modification of catheter tubing.
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Dooley, Joseph; Parsons, Thomas J.; Flavin, Franklin J.; Jenkins, Ronald K.; Marchbanks, Eric L.; Koopmans, Rudolf J., System, method and apparatus for producing a multi-layer, microcapillary film.
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