GB772148A - Film extrusion dies - Google Patents
Film extrusion diesInfo
- Publication number
- GB772148A GB772148A GB2505/55A GB250555A GB772148A GB 772148 A GB772148 A GB 772148A GB 2505/55 A GB2505/55 A GB 2505/55A GB 250555 A GB250555 A GB 250555A GB 772148 A GB772148 A GB 772148A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- pair
- adjustable
- blocks
- die
- 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.)
- Expired
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
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/35—Extrusion nozzles or dies with rollers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
<PICT:0772148/IV(a)/1> <PICT:0772148/IV(a)/2> <PICT:0772148/IV(a)/3> In a film extrusion die of the type comprising a pair of hollowed out blocks separated by spacer plates which define a reservoir and a slit extrusion orifice, one block has a pair of vertical bead-forming grooves connecting with the ends of the slit orifice and a pair of vertically adjustable bead-controlling members extending into the lower end of said grooves, and at least one block carries two vertically-adjustable dam members having curved-bottom doctoring surfaces. The die produces film with beaded edges and the adjustable dam members control the contour of the flashing on the outer sides of the beads. The die blocks may be provided with internal channels for the circulation of a heat exchange medium to maintain the temperature of the extrusion mixture. The film is extruded on to a rotating casting drum which may be grooved to receive the beads and whose temperature also may be controlled by internal circulation of a heat-exchange fluid. As shown in Fig. 1, the extrusion die comprises a pair of hollowed out blocks 10, 13 separated by spacer plate 11, and beaded film is extruded on to the cooled casting drum 34, grooved at 35, and is removed by correspondingly grooved roller 36. The die is shown in cross-section in Fig. 2 and in expanded view in Fig. 5. The two blocks 10, 13 and spacer plates 11, 12 define an entrance 141 and reservoir 14 for the molten material which passes over a pair of converging surfaces 15 and emerges through a slit orifice in film form. Beads are formed near each edge of the film by additional material which passes down vertical grooves 16 formed in one or both blocks at each end of the slit orifice. The size of the beads is controlled by varying the effective aperture of the grooves by means of a pair of adjustable members 22 carried by block 13. Each of these members has an extension which enters the respective groove 16 so that vertical adjustment of such member on block 13 varies the flow of material through the groove. Adjacent each adjustable member 22 is a vertically adjustable member 21, and these, together with horizontally adjustable members 28, Fig. 2, carried by the block 10, control the contour of the flashings formed on the outside of each bead. The thickness of film formed may be varied by using spacer plates 11, 12 of different thicknesses, and also by altering the rate of draw-down as determined by the relative rate of extrusion and peripheral speed of the casting drum. The die blocks are preferably made of corrosionresistant steel which can be annealed, hardened and highly polished. Suitable metals are stainless steel, alloy steels, vanadium alloys, bronze, brass or titanium or titanium alloy. The spacer plates 11, 12 may be of steel, bronze, brass, copper, aluminium or alloy. The preferred film-forming material is polyethylene terephthalate, but other materials which may be used are resins and superpolymers, e.g. nylon, polyethylene, polystyrene, polyvinyl halides, polyvinyl acetate, rubber hydrochloride, cellulose derivatives, polyesters from glycols and aliphatic dibasic acids, and polyesteramides. Specification 746,386 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US772148XA | 1954-02-02 | 1954-02-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB772148A true GB772148A (en) | 1957-04-10 |
Family
ID=22136733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2505/55A Expired GB772148A (en) | 1954-02-02 | 1955-01-27 | Film extrusion dies |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB772148A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020058625A1 (en) * | 2018-09-20 | 2020-03-26 | Compagnie Generale Des Etablissements Michelin | Coextrusion machine for elastomeric compounds, and method for manufacturing a profiled element strip |
-
1955
- 1955-01-27 GB GB2505/55A patent/GB772148A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020058625A1 (en) * | 2018-09-20 | 2020-03-26 | Compagnie Generale Des Etablissements Michelin | Coextrusion machine for elastomeric compounds, and method for manufacturing a profiled element strip |
FR3086198A1 (en) * | 2018-09-20 | 2020-03-27 | Compagnie Generale Des Etablissements Michelin | COEXTRUSION MACHINE FOR ELASTOMERIC MIXTURES |
CN112672871A (en) * | 2018-09-20 | 2021-04-16 | 米其林集团总公司 | Co-extrusion device for elastomeric compounds, and method for manufacturing profiled element strips |
CN112672871B (en) * | 2018-09-20 | 2023-01-24 | 米其林集团总公司 | Co-extrusion device for elastomeric compounds, and method for manufacturing profiled element strips |
US12005624B2 (en) | 2018-09-20 | 2024-06-11 | Compagnie Generate Des Etablissements Michelin | Coextrusion machine for elastomeric compounds, and method for manufacturing a profiled element strip |
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