IE54659B1 - Process and apparatus for the production of a plastics foil possessing a colour strip with variable colour intensity - Google Patents
Process and apparatus for the production of a plastics foil possessing a colour strip with variable colour intensityInfo
- Publication number
- IE54659B1 IE54659B1 IE2504/83A IE250483A IE54659B1 IE 54659 B1 IE54659 B1 IE 54659B1 IE 2504/83 A IE2504/83 A IE 2504/83A IE 250483 A IE250483 A IE 250483A IE 54659 B1 IE54659 B1 IE 54659B1
- Authority
- IE
- Ireland
- Prior art keywords
- nozzle
- wide slit
- foil
- melt flow
- flow
- Prior art date
Links
- 239000011888 foil Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000004033 plastic Substances 0.000 title description 5
- 229920003023 plastic Polymers 0.000 title description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 31
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 26
- 239000000057 synthetic resin Substances 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 239000000155 melt Substances 0.000 claims abstract description 18
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 18
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 16
- 238000009826 distribution Methods 0.000 claims description 22
- 230000007704 transition Effects 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 3
- 239000005336 safety glass Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 241000251729 Elasmobranchii Species 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000000549 coloured material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10651—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer comprising colorants, e.g. dyes or pigments
- B32B17/1066—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer comprising colorants, e.g. dyes or pigments imparting a tint in certain regions only, i.e. shade band
-
- 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
-
- 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
- B29C48/255—Flow control means, e.g. valves
- B29C48/2556—Flow control means, e.g. valves provided in or in the proximity of dies
-
- 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
- B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/17—Articles comprising two or more components, e.g. co-extruded layers the components having different colours
- B29C48/175—Articles comprising two or more components, e.g. co-extruded layers the components having different colours comprising a multi-coloured single component, e.g. striated, marbled or wood-like patterned
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/20—Articles comprising two or more components, e.g. co-extruded layers the components being layers one of the layers being a strip, e.g. a partially embedded strip
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
1. Process for the extrusion of a foil (20) possessing a coloured strip with variable colour intensity, in which a first flow (1) of a molten thermoplastic synthetic resin is extruded through a wide slit nozzle (4a) after widening out in the transverse direction to the extrusion direction (P) ans is shaped to a foil (20), with an additional flow of molten thermoplastic synthetic resin being injected into this first melt flow (1) before the latter leaves the nozzle (4a), characterised in that - the injection takes place at a position at which the melt flow (1) has already widened out completely in the direction transverse to the extrusion direction, - with the injected melt flow (2c) possessing a wedge-shaped cross-section and the injection taking place at right angles to the extrusion direction and with corresponding constriction of the first melt flow (1).
Description
This invention is concerned with a process for the extrusion of a foil possessing a coloured strip with variable colour intensity, in which a first flow of a molten thermoplastic synthetic resin is extruded through a wide slit nozzle after widening out in a direction tra. .verse to the direction of extrusion and is shaped to a foil, an additional flow of molten thermoplastic synthetic resin being injected Into this first melt flow before the latter leaves the nozzle, as well as apparatus for carrying out this method.
Apparatus for the production of a foil containing a coloured strip starts from an extruder for the melting of a stream of a thermoplastic plastics and a broad slit tool having a distribution channel with, extending in front, a constriction zone, a damning bar, a forward zone formed with an upper lip and a lower lip having a nozzle discharge aperture for the forming of the foil, the broad slit tool possessing an injection opening for the further thermoplastic partial melt stream.
There is known from German Offenlegungsschrif No. 20 35 578 a process for the production of a foil possessing a colour strip with variable colour intensity, in which the flow of coloured plastics is injected at a juncture at which the main stream broadens in the cross-sectional direction.
The injection of the coloured melt stream therefore takes place in the region - 2 54659 of the distribution channel, as a result of which the coloured melt stream is likewise spread out in a direction transverse to the extrusion direction and is distributed.
A similar process and apparatus is known from early published European Patent Application No. 0 052 491, in which a coloured melt for the formation of a coloured strip is Injected into a colourless melt stream in a manner such that the coloured stream is completely enclosed in the colourless melt. For this purpose, a torpedo shaped probe is provided which is arranged within the extrusion channel and around which the colourless melt flows on all sides.
In the production of foils transparently coloured in part regions, as are required for example as Intermediate foils for safety glass for motor vehicles, a precisely defined and dimensioned transition region from a colourless part into a coloured part with continuous transfer of the colour intensity is required, with such foils having to be producible reproducibly in like quality. A disadvantage of the process according to German Offenlegungsschrift No. 20 35 578 is to be seen in that it is very difficult to control exactly the desired coloured strips in cross-section, spreading-out, dimensioning and colour intensity, since the coloured material in the distribution channel is Injected and Is subject subsequently to a spreading-out transversely to the extrusion direction. Likewise, with the process for the arrangement according to early publish:..! European Patent Application No. 0 052 491, 1t is difficult to maintain the desired exact dimensioning and the development of the colour gradient, since the coloured melt is injected within a stream of colourless material while undergoing displacement thereof on all sides, and, with this, existing small variations in the pressure conditions lead to coloured strips differing in intensity and dimensioning. Not completely avoidable however, are pressure variations from sides of the extruder, which cannot however be evened out in relation to the position of the coloured strip with the process and the apparatus according to early published European Patent Application No. 0 052 491.
It is an object of the Invention to create a process and an apparatus with which it is possible to produce foils, such as are known for example for coloured safety glass foils, made of polyvinylbutyral, with a coloured strip of variable colour intensity, reproducibly, in simple innner, and in like quality. - 3 54659 According to the invention, there is provided a process for the extrusion of a foil possessing a coloured strip with variable colour intensity, in which a first flow of a molten thermoplastic synthetic resin is extruded through a wide slit nozzle after widening out in a direction transverse to the direction of extrusion and is shaped to a foil, an additional flow of molten thermoplastic synthetic resin being injected into this first melt flow before the latter leaves the nozzle, wherein the injection takes place at a position at which the first melt flow has already widened out completely in the direction transverse to the extrusion direction, and the injected melt flow possesses a wedge-shaped cross-section, the injection taking place at right angles to the extrusion direction and with corresponding constriction of the first melt flow.
The invention thus goes along a new route in v. lich it is proposed that a colourless and a coloured melt stream be respectively shaped to a foil of a desired width Ba or Bb and be melted with one another along a lateral edge before leaving the nozzle to a foil having a width of Ba + Bb and, over a width Be calculated from the transition line of the coloured foil into the region of the colourless foil, a coloured strip extending in wedge-shaped manner from a part flow of the coloured melt flow is introduced through a broad slit nozzle with a wedge shaped outlet gap provided, in the extrusion direction, before the damming bar and after the distribution channel, with corresponding displacement of the colourless melt flow.
According to a preferred process according to the present invention, a wide foil is produced which possesses a region of uncoloured foil and a region of foil coloured completely through, with a transitional region in between formed of coloured and colourless melt in the 'nape of a coloured wedge strip. With this there is produced the transitional region in which a coloured melt flow with differential cross-section and correspondingly varying colour intensity is Introduced, likewise by means of a broad slit nozzle by 30 displacement of the colourless melt flow from one side. The broad slit nozzle makes it possible to produce, according to the length or width of the nozzle outflow gap, a precisely coloured region dimensioned correspondingly in cross-section, with the same exit rate of the coloured melt being made possible over the entire width of the desired colour strip even with different thickness thereof as a result of the shape of the broad slit nozzle.
Accordingly therefore, the desired exact control of the coloured strip is e» 4 · possible.
The basic construction of a broad slit tool is described for example in Kunststoff-Maschinenfuehrer (Plastics Machinery Gui· i), Carl Hauser Verlag Munich, Vienna 1979, page 95 to 98. The apparatus according to the invention for the production of a foil containing a coloured strip comprises an extruder for melting a thermoplastic synthetic resin and a wide slit tool having a distribution channel and a nozzle outflow zone, a nozzle outflow gap for shaping the foil being formed between an upper lip and a lower lip, wherein the wide slit tool possesses a further injection opening for a further thermoplastic component melt flow, the injection opening is formed as a small wide slit nozzle arranged, seen 1n the extrusion direction, on the forward side of a damming bar of the wide slit tool, the wide slit tool being provided with a following throttling zone after the distribution channel, and the wide slit nozzle being formed by the damming bar and a nozzle plate with a nozzle outflow gap extending transverse to the extrusion direction along the forward edge of the damming bar, the nozzle plate being secure,! in front of the damming bar.
According to a preferred embodiment of the invention, apparatus for the production of a foil containing a coloured strip comprises two wide slit tools connected to one another, a coloured synthetic resin melt being suppliable to one wide slit tool and an uncoloured synthetic resin melt being suppliable to the other wide slit tool, the apparatus having, for each wide slit tool, a connection for supply of the synthetic resin melt and a distribution channel, and the apparatus also having a common adjustable nozzle outflow gap and an arrangement for injection of one part of one synthetic resin melt into the flow of the other synthetic resin melt, wherein the injection takes place at a position at which the melt 'lows have already widened out completely in a direction transverse to the direction of supply of the synthetic resin melts, the injection arrangement is formed as additional, smaller wide slit nozzle having an outflow gap narrowing in the shape of a wedge over the course of Its length, the additional wide slit nozzle being so arranged in the transition region from one wide slit tool to the other wide slit tool that the outflow gap of the additional wide slit nozzle is aligned transverse to the melt supply direction, extends in the form of a wedge into the flow of one melt flow, and extends at right angles to its direction of supply. - 5 54658 The arrangement for the production of a foil with differential colour intensity according to the invention containing a coloured strip thus provides, in a further development of the known arrangements, that the injection opening for the further thermoplastic melt be formed as a small broad slit nozzle at the forward side of the damming bar of the large broad slit tool, considered in the extrusion direction, and that a nozzle plate be fixed in front of it with a nozzle outflow gap extending along the forward edge of the damming bar transverse to the extrusion direction. The injection of the additional melt stream according to the invention therefore takes place after the distribution channel, that is, therefore, after the main melt flow is spread out completely in the direction transverse to the total desired foil width, and is already flowing in the region of the damming bar parallel to the combined width in the extrusion direction. The forward edge of the damming bar is used according to the invention simultaneously as a nozzle outlet gap edge for the additional melt flow and is remodelled by design as a nozzle plate possessing the form employed for the desired nozzle, corresponding in size within the overall broad slit tool to the nozzle plate in this region for a small broad slit nozzle. The arrangement according to the invention has the essential advantage, in contrast to known injection nozzles, torpedoes or other essentially round or oval tubular injection arrangements, that even for the melt being injected, a flow directed distribution of the mass over a desired cross-section takes place in such manner that at the completion of the distribution process, the outflow speed of the additional melt stream is equal at each point of the outflow gap, as a result of employment of a correspondingly formed tool, so that a friction free fusion with the already provided material flow takes place.
An advantageous embodiment of the invention provides that the damming bar of the Targe broad slit tool possesses a feeding bore with a connecting bore to the broad slit nozzle for the partial melt flow. According to the form of the broad slit nozzle, this can be fed asymmetrically or symmetrically, this conforming also to the formation o- the nozzle outflow gap and of the desired cross-section.
A preferred formation of the broad slit nozzle provides that this be incorporated partially in a nozzle plate with a distribution channel, a dam, and a nozzle outflow gap. This distribution plate is then attached to the forward edge of the damming bar and forms, together with this, the flow - 6 54659 channel for the partial melt stream in the completed region.
For achievement of a coloured strip which is wedge-shaped in cross-section, it is proposed according to the invention that the nozzle outflow gap of the small broad slit nozzle is formed wedge-shaped and decreases over its length from a previously provided gap width, with however the broader slit nozzle being so formed that the partial melt flow over the entire length of the nozzle outflow gap possesses the ime outflow speed. According to the invention, the nozzle outlet gap is adjustably formed, for example by a corresponding adjustability of the nozzle plate, for example by means of screws or plates, inter alia.
A preferred formation of the arrangement according to the invention for the production of coloured strips of variable Intensity in a melt flow, with a foil being produced with a colourless foil region, a coloured foil region, and a transitional region, provides that two broad slit tools of like geometry or of different nozzle widths, which are each fed with a melt flow by an extruder, are so arranged and connected next to one another that a nozzle outflow gap passing through is provided, with a width totalled from the individual nozzle widths, and the injection opening formed as a broad slit nozzle extending from the transition line of the broad slit tools arranged next to one another extends over a desired width in a .urtial region of one broad slit tool and is connected through a supply channel with the melt stream of the other broad slit tool.
The preferred area of use for the invention is the production of foils based on polyvinylbutyral which are used as intermediate foils for safety glass in the motor vehicle industry and 1n the building industry.
This invention is explained further in the drawings in relation to an explanatory example.
There is shown in Figure 1, a cross-section through a known broad slit tool, Figure 2, the view A on the flow cross-section of the broad slit tool according to Figure 1, in schematic representation, - 7 54659 Figure 3, a plan view on a flow cross-section of two broad slit tools arranged next to one another, in.schematic representation, Figure 4, a cross-section through a foil with colourless, coloured and transitional regions, Figure 5, a schematic plan view of a construction for the production of a foil according to Figure 4, Figure 6, a cut-away plan view of the opened broad slit tool according to Figure 5, in the region of the supply of ,.ie partial flow for the coloured strip, Figure 7, a view of the cross-section BB according to Figure 6, Figure 8, a cross-section of the broad slit nozzle formed of a damming bar and nozzle plate according to Figure 7, Figure 9, a view from above of the broad slit nozzle according to Figure 8, Figure 10, a view on the nozzle plate according to Section CC of Figure 9, and Figure 11, the view E on the broad slit nozzb according to Figure 8.
According to Figure 1, there is schematically shown a broad or wide slit tool 4a in which the melt flow 1 in the supply channel 3a, coming from the extruder, enters and then is divided up to the desired width as it passes through the distribution channel 5a. At the distribution channel 5a, there adjoins a constricting or throttling zone 10a, a channel with constant gap height, with gap length decreasing corresponding to the material pressure, in which the material flow is controlled and at the end of which it passes over into the forward zone 11a in the region of the damming bar 16a and then into the nozzle outflow zone 7a. By adjustment of the damming bar by means of the draw-in bolt and thrust bolt 12, corresponding flow co>. ’ections can be conducted in this region, and likewise for the region >v’ the nozzle outflow zone, which is adjustable likewise through the adjustable upper lip 8a by - 8 means of the screw 13. The shaped melt can then leave the broad slit tool at the nozzle outflow gap 9a.
In Figure 2, there is shown the schematic view of the formation of the flow channel cross-section from the entry of the melt through the distribution channel 5a, the constricting zone 10a, and the forward zone 11a in the region of the damming bar.
According to the invention, it is possible to form and couple to one another two large broad slit tools in a manner such that an over-wide foil formed from uniformly or variably like coloured or differently coloured plastics is producible. Essentially what happens wit'1 this is that the broad slit tools 4a, 4b possess the same geometry in relation to the flow cross-section of formation, but can possess different widths Ba, Bb. The melts 1 and 2 are preferably based on like thermoplastic plastics, but with different colouring or colourless and coloured respectively.
Correspondingly, then, the foil regions 20a, 20b are formed and unified to a unitary foil. For formation of the coloured strip region 20c in foil 20, there is provided the use of a special broad slit nozzle 21 in one of the broad slit tools 4a, 4b, in the example according to Figure 3, the broad slit tool 4a. Preferably, the broad slit nozzle 21 in the transition region of tool 4a is provided for the other tool 4b, this being directed exclusively however by the desired arrangement and formation of the colour strip region 20c.
In Figure 4, there is shown in cross-section a preferred formation of a foil based in particular on polyvinylbutyral, which is produced by extrusion with a colour strip. With this, a foil 20 1s produced with the width Ba + Bb, which possesses a colourless region 20a and a fully coloured region 20b.
In the transitional region of the coloured foil 20b to the uncoloured foil 20a, seen from the transitional line 27, there is provided a coloured strip with colour intensity decreasing in the direction of the colourless foil, that is the foil region 20c, which preferably extends in a wedge shape under the angle in an angular range of preferably 3 to 20°. Corresponding to this foil region with coloured strip 20c, which possesses a width Be, there are formed appropriate extrusion tools, as schematically indicated in the construction according to Figure 5, by way of example. With this, the colourless melt flow is plasticised by means of the extruder 14 and supplied through melt pumps 16 to the supply channel 3a to the .irst broad slit tool 4a. - 9 In the second extruder 15, the coloured plastics melt 1 is melted and supplied by means of the melt pumps 16b to the supply channel 3b to the second broad slit tool 4b. A partial melt flow 2c for the coloured strip is branched off from the melt flow 2 over the guide 3c and supplied, for example, by means of a melt pump 17 of the broad slit nozzle 21 formed additionally in the tool 4a, for formation of the colour strip 20c in the foil 20.
In Figures 6 and 7, there is shown in cut-away section more precisely the formation of the broad slit nozzle 21 and its incorporation in the large broad slit tool 4a. From the plan view of Figure 6, it can be seen how the broad slit tool 4a for the colourless foil 20a and the broad slit tool 4b for the coloured foil 20b are arranged directly adjacent one another merging into one another, with the contact surfaces of the tools 4a, 4b being formed along the transition line 27 between the two foil regions 20>;, 20b. The arrow P indicates the extrusion direction for the foil 20, wit'i the additional broad slit nozzle 21 for the injection of a part stream with respect to coloured melt being arranged in the region of the colourless foil, seen in the extrusion direction before the damming bar 6a. Moreover, the damming bar 6a can be formed, for example, with a recess 28 in which a nozzle plate 22 is employed for formation of the flow cross-section for the broad slit nozzle 21. In Figure 7, there is then shown in vertical cross-section, the formation of the broad slit nozzle 21 in the region of the tool 4a. The colourless melt 1 comes from the distribution channel 5a and is distributed uniformly over the constricting zone so that, on entry into the forward zone 11a in the region of the damming bar, the colourless melt 1 runs parallel to the extrusion direction over the completely desired fo’l width. At the forward edge 29 of the damming bar 6a, the nozzle outflow for the partial melt flow 2c is formed in the desired width from the broad «lit nozzle 21. The partial melt flow 2c is, for example, supplied through a feed passage-defining recess in the damning bar 6a to the flow cross-section of the broad slit nozzle 21. The flow cross-section of the broad slit nozzle 21 is formed by the nozzle plate 22 which is fixed, for example, by mneans of screws which are not shown, on the forward side of the damming bar with corresponding retention of flow cross-sections.
In Figures 8 to 11, there is shown by way of example a formation of 35 broad slit nozzle 21 for the supply of a partial melt flow into a main melt flow flowing already distributed in a broad slit nozzle. Figure 8 shows yet - 10 54659 again in enlarged sectional view the cross-section through the damming bar 6a according to Figure 7, with recess opening 30 for the supply of the melt flow and through passage opening 23 in the flow cross-section of the broad slit nozzle 21. The flow cross-section of the broad slit nozzle 21 is formed between the forward side of the damming bar 6a and the nozzle plate 22 installed therefor, the nozzle outlet gap 24 running along the edge 29 of the damming bar 6a. In Figure 9, there is shown a plan view of the damming bar and nozzle plate according to Figure 8. From this it can be seen that it is appropriate to employ the nozzle plate 22 in a recess 28 of the damming bar 6a. The section DD according to Figure 9 corresponds to the cross-section according to Figure 8. In Figure 10, there are shown the details of the flow cross-section in the nozzle plate 22 according to section CC of Figure 9.
The flow cross-section of the broad slit nozzle 21 comprises essentially the distribution channel 211, the dam 210, with the function of a constriction gap, and the nozzle outlet gap 24. The length L of the nozzle outlet gap 24 is chosen according to the desired width of the injected coloured strip in the foil.
Preferred 1s a wedge shaped nozzle outlet gap 24, as is to be seen from Figure 11, with the gap extending in wedge shape from the largest width 241 down to zero at the oppositely positioned end 240. With such a formation of the nozzle outlet gap 24, injection on one side as shown in Figure 9 is appropriate.
The incorporation according to this invention of an additional broad slit nozzle in a broad slit tool for the introduction of a differentially coloured melt for achieving a coloured strip of defined colour intensity and defined size is possible, as in the indicated example, with two broad slit tools coupled together and also with employment of onl· one large broad slit tool.
Claims (18)
1. A process for the extrusion of a foil possessig a coloured strip with variable colour intensity, in which a first flow o f a molten thermoplastic synthetic resin is extruded through a wide slit nozzle after 5 widening out in a direction transverse to the direction of extrusion and is shaped to a foil, an additional flow of molten thermoplastic synthetic resin being injected into this first melt flow before the latter leaves the nozzle, wherein the injection takes place at a position at which the first melt flow has already widened out completely in the direction transverse to the 10 extrusion direction, and the injected melt flow possesses a wedge-shaped cross-section, the injection taking place at right angles to the extrusion direction and with corresponding constriction of the first melt flow.
2. A process according to Claim 1, wherein, parallel to the first melt flow, a further synthetic resin melt flow widens out t unsverse to the 15 extrusion direction and is shaped into a foil, the fir re melt flow and the further melt flow are then melted together to a foil of corresponding width, and the injection of the additional melt flow takes place in a transition region between the first melt flow and the further synthetic resin melt flow.
3. A process according to Claim 2, wherein the first flow possesses a 20 different colour intensity from the further melt flow.
4. Apparatus for the production of a foil containing a coloured strip, comprising an extruder for melting a thermoplastic synthetic resin and a wide slit tool having a distribution channel and a nozzle outflow zone, a nozzle outflow gap for shaping the foil being formed between ή upper lip and a lower 25 lip, wherein the wide slit tool possesses a further injection opening for a further thermoplastic component melt flow, the injectiun opening is formed as a small wide slit nozzle arranged, seen in the extrusion direction, on the forward side of a damming bar of the wide slit tool, the wide slit tool being provided with a following throttling zone after the distribution channel, and 30 the wide slit nozzle being formed by the damming bar and a nozzle plate with a nozzle outflow gap extending transverse to the extrusion direction along the forward edge of the damming bar, the nozzle plate being secured in front of the damming bar. - 12 54659
5. Apparatus according to Claim 4, wherein the outflow gap of the additional wide slit nozzle is formed so as to be adjustable.
6. Apparatus according to Claim 4 or Claim 5, wh-vein the damming bar possesses a feed passage with a connecting passage to the wide slit nozzle for 5 the further thermoplastic component melt flow.
7. Apparatus according to any of Claims 4 to 6, wherein the wide slit nozzle is incorporated on one side in the nozzle plate with a distribution channel, a dam, and said nozzle outflow gap.
8. Apparatus according to any of Claims 4 to 7, wherein the nozzle
9. 10 outflow gap of the wide slit nozzle is formed in the shape of a wedge and diminishes over its length from a provided gap width to zero, the wide slit nozzle being so formed that the further thermoplastic component melt flow attains the same outflow speed over the entire length of the nozzle outflow gap. 15 9. Apparatus for the production of a foil containing a coloured strip comprising two wide slit tools connected to one another, a coloured synthetic resin melt being suppliable to one wide slit tool and an uncoloured synthetic resin melt being suppliable to the other wide slit tool, the apparatus having, for each wide slit tool, a connection for supply of the synthetic resin melt 20 and a distribution channel, and the apparatus also having a common adjustable nozzle outflow gap and an arrangement for injection of one part of one synthetic resin melt into the flow of the other synthetic resin melt, wherein the injection takes place at a position at which the melt flows have already widened out completely in a direction transverse to the direction of supply of 25 the synthetic resin melts, the injection arrangement is formed as additional, smaller wide slit nozzle having an outflow gap narrowing in the shape of a wedge over the course of its length, the additional wide slit nozzle being so arranged in the transition region from one wide slit tool to the other wide slit tool that the outflow gap of the additional wide slit nozzle is aligned 30 transverse to the melt supply direction, extends in the form of a wedge into the flow of one melt flow, and extends at right angles to its direction of supply. 10. Apparatus according to Claim 9, wherein the outflow gap of the additional wide slit nozzle is formed so as to be adjustable. - 13 54659
10. 11. Apparatus according to Claim 9, comprising, for each wide slit tool, adanming bar.
11. 12. Apparatus according to Claim 11, wherein the damming bar possesses a feed passage with a connecting passage to the wide slit nozzle for flow of 5 said one part of said one synthetic resin melt.
12. 13. Apparatus according to any of Claims 9 to 12, wherein the wide slit nozzle is incorporated on one side in a nozzle plate with a distribution channel, a dam, and said nozzle outflow gap.
13. 14. Apparatus according to Claim 11, wherein the nozzle outflow gap is 10 formed in the shape of a wedge and diminishes over its length from a provided gap width to zero, the wide slit nozzle being so formed that the flow of said one part of said one synthetic resin melt attains the same outflow speed over the entire length of the nozzle outflow gap.
14.
15. A process for the production of a foil possessing a coloured strip, 15 substantially as hereinbefore described with reference to Figures 3 to 11 of the accompanying drawings.
16. A foil possessing a coloured strip whenever prepared by a process as claimed in any of Claims 1 to 3, or Claim 15.
17. A foil possessing a coloured strip substantially as hereinbefore 20 described with reference to Figure 4 of the accompanying drawings.
18. Apparatus for the production of a foil possessing a coloured strip, substantially as hereinbefore described with reference to Figure 3 and Figures 5 to 11 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3239782A DE3239782C2 (en) | 1982-10-27 | 1982-10-27 | Device for coextruding a film with a color wedge made of an uncolored thermoplastic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE832504L IE832504L (en) | 1984-04-27 |
| IE54659B1 true IE54659B1 (en) | 1989-12-20 |
Family
ID=6176719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE2504/83A IE54659B1 (en) | 1982-10-27 | 1983-10-26 | Process and apparatus for the production of a plastics foil possessing a colour strip with variable colour intensity |
Country Status (18)
| Country | Link |
|---|---|
| EP (1) | EP0111678B1 (en) |
| JP (1) | JPS59111816A (en) |
| AR (1) | AR231507A1 (en) |
| AT (1) | ATE39880T1 (en) |
| AU (1) | AU562924B2 (en) |
| BR (1) | BR8305922A (en) |
| CA (1) | CA1219108A (en) |
| CS (1) | CS240980B2 (en) |
| DE (2) | DE3239782C2 (en) |
| ES (1) | ES526770A0 (en) |
| FI (1) | FI78415C (en) |
| IE (1) | IE54659B1 (en) |
| IN (1) | IN159684B (en) |
| MX (1) | MX168003B (en) |
| SU (1) | SU1268100A3 (en) |
| TR (1) | TR21544A (en) |
| YU (2) | YU44862B (en) |
| ZA (1) | ZA837969B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6161835A (en) * | 1984-08-31 | 1986-03-29 | Sekisui Chem Co Ltd | Manufacture of embossed thermoplastic resin sheet |
| DE3709411A1 (en) * | 1987-03-21 | 1988-09-29 | Huels Troisdorf | METHOD AND DEVICE FOR PRODUCING WOOD MASK STRUCTURAL-LIKE THICK LAYERS BY COEXTRUSION |
| US5087488A (en) * | 1989-10-19 | 1992-02-11 | Aeroquip Corporation | Method and apparatus for forming a plastic article with an overlay of varying thickness having a shaded color appearance |
| DE4006006C1 (en) * | 1990-02-26 | 1991-09-19 | Vegla Vereinigte Glaswerke Gmbh, 5100 Aachen, De | |
| DE4120324A1 (en) * | 1991-06-20 | 1992-12-24 | Pedex & Co Gmbh | Protective garment cover - made from extruded tubular film of opaque recycled polymer with a transparent strip of virgin polymer |
| DE102004013201A1 (en) * | 2004-03-17 | 2005-10-06 | Kuraray Specialities Europe Gmbh | Process for the coextrusion of melt streams of different composition |
| DE102008000685A1 (en) | 2008-03-14 | 2009-09-17 | Kuraray Europe Gmbh | Completely or partially colored interlayer film for laminated glazings, comprises plasticizer-containing polyvinyl acetal, perylene pigments, UV-absorber, and colored and colorless sections |
| DE102010019941B4 (en) | 2010-05-08 | 2014-11-13 | Horst Pabst | Apparatus for the coextrusion of thermoplastic melt streams for the production of laminated glass panes |
| EP3912807A1 (en) | 2020-05-19 | 2021-11-24 | Kuraray Europe GmbH | Printed interlayer films for laminated glazing with improved nir transparency |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3354025A (en) * | 1964-09-18 | 1967-11-21 | Monsanto Co | Color gradated laminates |
| JPS4945793B1 (en) * | 1969-07-19 | 1974-12-06 | ||
| BE793756A (en) * | 1972-01-11 | 1973-05-02 | Cellophane Sa | LAMINATION DEVICE FOR FLAT DIE CO-EXTRUSION |
| DE2622011A1 (en) * | 1976-05-18 | 1977-12-08 | Troester Maschf Paul | SPRAY HEAD |
| DE2622289C3 (en) * | 1976-05-19 | 1980-03-20 | Dynamit Nobel Ag, 5210 Troisdorf | Apparatus for extruding a patterned sheet of thermoplastics |
| EP0010895B1 (en) * | 1978-10-23 | 1983-08-17 | Imperial Chemical Industries Plc | Method of making laminates of thermoplastic polymers by a single-channel coextrusion process and melt injector block for use therein |
| DE2853850C3 (en) * | 1978-12-13 | 1981-10-01 | W. U. H. Fernholz (Gmbh & Co Kg), 5882 Meinerzhagen | Polystyrene film |
| JPS55135642A (en) * | 1979-04-11 | 1980-10-22 | Sekisui Chem Co Ltd | Method and apparatus for producing thermoplastic resin sheet with colored belt |
| DE3010691C2 (en) * | 1980-03-20 | 1982-12-23 | Hoechst Ag, 6000 Frankfurt | Apparatus for producing a coextruded composite film with uncoated edges and made of at least two thermoplastics |
| US4316868A (en) * | 1980-11-17 | 1982-02-23 | Monsanto Company | Extruding colored thermoplastic resin sheets |
| DE3132509C2 (en) * | 1981-08-18 | 1984-06-14 | Dynamit Nobel Ag, 5210 Troisdorf | Method and slot tool for producing a color wedge film |
-
1982
- 1982-10-27 DE DE3239782A patent/DE3239782C2/en not_active Expired
-
1983
- 1983-09-15 SU SU833642365A patent/SU1268100A3/en active
- 1983-10-19 TR TR21544A patent/TR21544A/en unknown
- 1983-10-20 DE DE8383110457T patent/DE3378900D1/en not_active Expired
- 1983-10-20 EP EP83110457A patent/EP0111678B1/en not_active Expired
- 1983-10-20 AT AT83110457T patent/ATE39880T1/en active
- 1983-10-21 AR AR294615A patent/AR231507A1/en active
- 1983-10-24 IN IN1308/CAL/83A patent/IN159684B/en unknown
- 1983-10-25 MX MX19919983A patent/MX168003B/en unknown
- 1983-10-25 CS CS837832A patent/CS240980B2/en unknown
- 1983-10-25 YU YU2132/83A patent/YU44862B/en unknown
- 1983-10-25 JP JP58198410A patent/JPS59111816A/en active Granted
- 1983-10-26 FI FI833923A patent/FI78415C/en not_active IP Right Cessation
- 1983-10-26 ZA ZA837969A patent/ZA837969B/en unknown
- 1983-10-26 IE IE2504/83A patent/IE54659B1/en unknown
- 1983-10-26 ES ES526770A patent/ES526770A0/en active Granted
- 1983-10-26 AU AU20595/83A patent/AU562924B2/en not_active Ceased
- 1983-10-26 CA CA000439768A patent/CA1219108A/en not_active Expired
- 1983-10-26 BR BR8305922A patent/BR8305922A/en not_active IP Right Cessation
-
1985
- 1985-10-15 YU YU1639/85A patent/YU44695B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0111678A1 (en) | 1984-06-27 |
| ATE39880T1 (en) | 1989-01-15 |
| ES8406281A1 (en) | 1984-07-01 |
| FI78415C (en) | 1989-08-10 |
| DE3239782A1 (en) | 1984-05-03 |
| EP0111678B1 (en) | 1989-01-11 |
| YU213283A (en) | 1986-02-28 |
| AU2059583A (en) | 1984-05-03 |
| YU44695B (en) | 1990-12-31 |
| DE3378900D1 (en) | 1989-02-16 |
| YU163985A (en) | 1986-10-31 |
| ZA837969B (en) | 1984-06-27 |
| IN159684B (en) | 1987-05-30 |
| AR231507A1 (en) | 1984-12-28 |
| JPS6224246B2 (en) | 1987-05-27 |
| IE832504L (en) | 1984-04-27 |
| FI78415B (en) | 1989-04-28 |
| DE3239782C2 (en) | 1985-01-31 |
| JPS59111816A (en) | 1984-06-28 |
| SU1268100A3 (en) | 1986-10-30 |
| CS240980B2 (en) | 1986-03-13 |
| BR8305922A (en) | 1984-06-05 |
| TR21544A (en) | 1984-09-24 |
| FI833923A (en) | 1984-04-28 |
| MX168003B (en) | 1993-04-26 |
| YU44862B (en) | 1991-04-30 |
| CS783283A2 (en) | 1985-06-13 |
| ES526770A0 (en) | 1984-07-01 |
| AU562924B2 (en) | 1987-06-25 |
| FI833923A0 (en) | 1983-10-26 |
| CA1219108A (en) | 1987-03-17 |
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