GB779646A - Extrusion dies for use in the continuous manufacture of films - Google Patents
Extrusion dies for use in the continuous manufacture of filmsInfo
- Publication number
- GB779646A GB779646A GB25572/56A GB2557256A GB779646A GB 779646 A GB779646 A GB 779646A GB 25572/56 A GB25572/56 A GB 25572/56A GB 2557256 A GB2557256 A GB 2557256A GB 779646 A GB779646 A GB 779646A
- Authority
- GB
- United Kingdom
- Prior art keywords
- die
- blocks
- block
- pict
- spacer plate
- 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
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
-
- 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:0779646/IV(a)/1> <PICT:0779646/IV(a)/2> <PICT:0779646/IV(a)/3> <PICT:0779646/IV(a)/4> <PICT:0779646/IV(a)/5> An apparatus for extruding films with beaded edges includes an extrusion die which comprises (1) two blocks having outer slanting lower portions whose inner surfaces form extrusion orifice lips, one of the blocks having an inner chamber for the liquid to be extruded and the other block having an inner surface which is smooth except for two bead-forming spaced grooves which terminate near the ends of the orifice in slots of similar cross-section; (ii) a spacer plate serving to separate the blocks and having a cut-away portion similar in size and shape to the inner chamber, and bearing an orifice bar near its outlet, the plate defining an elongated slot orifice in conjunction with the inner surfaces of the blocks; (iii) means for holding the blocks and plate together; and (iv) a passage in the first block for the introduction of a liquid into the chamber. A preferred form of die is shown separated into its parts in Fig. 2 and in crosssection (assembled) in Fig. 4. The die consists of two blocks 14, 15 which are bolted together with the interposition of a spacer plate 16, whose thickness determines the thickness of the extruded film. Block 14 has a conduit 12 through which the material passes into a recess 18 with sloping bottom wall 19. Uniform distribution of the material is assisted by bar 17, which is removably located by lugs 22 in spacer plate 16 (see also Fig. 5) and which is tapered upwardly and downwardly on the side which faces the block 14 and is also tapered from its centre towards its sides. Spacer plate 16 has an aperture 20 corrsponding in shape to the recess 18 in die block 14, and has sloping portions 23 adjacent to the opening to provide a larger flow of material at these positions, to assist formation of the beads. The width d of the aperture determines the width of the film as extruded. Die block 15, which is shown in perspective from below in Fig. 3, has two slots 24, which also permit an increased flow of material to form the beads. The aperture of the slots is adjustable by a pair of plates 29 carried by a transverse bar 28 slidably arranged in slots 26 in the die block 15. The die may be made of stainless steel, alloy steels such as vanadium steel, brass, bronze, titanium or titanium alloy. The spacer plate 16 may be of steel, titanium, copper or aluminium. The assembled die is disposed with its aperture slightly above a casting drum (see Fig. 1) and the peripheral speed of the drum 10 is faster than the rate of extrusion. A bead-forming roller 36 is located near the extrusion die and presses against the film on the drum. Materials which may be extruded are synthetic resins and superpolymers such as polyethylene terephthalate, nylon, polyethylene, polystyrene, polyvinyl halides, polyvinyl acetate, rubber hydrochloride, cellulose derivatives, polyesters from glycols and aliphatic dibasic acids and polyesteramides. Specifications 578,079, [Group IV], 617,129 and 746,386 also are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US779646XA | 1954-01-25 | 1954-01-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB779646A true GB779646A (en) | 1957-07-24 |
Family
ID=22141056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25572/56A Expired GB779646A (en) | 1954-01-25 | 1955-01-25 | Extrusion dies for use in the continuous manufacture of films |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB779646A (en) |
-
1955
- 1955-01-25 GB GB25572/56A patent/GB779646A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4676851A (en) | Process and apparatus for forming integral interlocking closure film stock | |
FI830923A0 (en) | FOERFARANDE OCH ANORDNING FOER FRAMSTAELLNING AV ETT PRODUKTFOERRAOD FOER TILLVERKNING AV FOERSLUTNINGSBARA BEHAOLLARE | |
JPH0564087B2 (en) | ||
MA20914A1 (en) | Method and device for the production of finned tubes | |
US2754544A (en) | Film extrusion die | |
GB1184474A (en) | Improvements in or relating to Extruders | |
US3706518A (en) | Extrusion die deckle means | |
US3895898A (en) | Flat sheet injection head for roller-head installations | |
GB2069921A (en) | Extrusion die head for extruding a pair of elastomeric material strips and method of making the die head | |
GB779646A (en) | Extrusion dies for use in the continuous manufacture of films | |
US4292019A (en) | Extruded plastic foam shaping apparatus | |
US3694132A (en) | Extrusion die deckle means | |
US3302239A (en) | Die | |
US4060368A (en) | Flat-sheet injection head | |
GB779645A (en) | Improvements in or relating to continuous manufacture of films | |
US3836313A (en) | Flat film extrusion die | |
US3674388A (en) | Manufacture of plastic siding | |
US3323172A (en) | Extrusion apparatus | |
US3273202A (en) | Apparatus for manufacturing thermoplastic foils with beaded edges | |
GB772148A (en) | Film extrusion dies | |
US4021169A (en) | Apparatus for the manufacture of siding | |
JPH0691723A (en) | T-die | |
JPS56143A (en) | Die plate-attaching device for extruder | |
JPS6037781B2 (en) | extrusion die | |
CN214872146U (en) | PVC super transparent film calendering equipment |