CN1067299C - Die coating method and apparatus - Google Patents
Die coating method and apparatus Download PDFInfo
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- CN1067299C CN1067299C CN95192830A CN95192830A CN1067299C CN 1067299 C CN1067299 C CN 1067299C CN 95192830 A CN95192830 A CN 95192830A CN 95192830 A CN95192830 A CN 95192830A CN 1067299 C CN1067299 C CN 1067299C
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- downstream
- lip
- stick
- die
- upstream
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
Abstract
A die coating method and apparatus includes a die (40) having an upstream bar (64) with an upstream lip (60) and a downstream bar (66) with a downstream lip (62). The upstream lip (60) is formed as a land (68) and the downstream lip (62) is formed as a sharp edge (70). The shape of the land conforms to the shape of the surface being coated. Changing at least one of the slot height H, the overbite O, and the convergence C can improve coating performance. A replaceable, flexible strip (350) can be used above the coating slot to facilitate replacement of a damaged overbite edge. A low surface energy coating can be applied to the downstream bar and land surfaces.
Description
Technical field
The present invention relates to coating process, especially, relate to the coating process of using die.
Background of invention
United States Patent (USP) the 2nd, 681 discloses a kind of vacuum method of stable coatings bead of the metering plater that is used for directly extruding and slip pattern for No. 294.This stable these device coating abilities of having strengthened.Yet, even these platers do not possess the enough abilities that are provided as the desired thin wet layer of some coating products on the whole yet when low liquid viscosity very.
United States Patent (USP) the 2nd, 761,791 have disclosed simultaneously by the different layers relation multiple liquid grain have been coated onto the extruding of the wide range of forms on the motion rim and the plater of slip.Yet concerning some coated products, these platers do not possess enough at needed rim rotating speed be coated with the overall performance that keeps desired many wet layer thicknesses under the lamellar spacing.
United States Patent (USP) the 5th, 256,357 have disclosed a kind of multilayer spreading die that has the following interlock (underbite) on one of two trough rims.Following interlock on one of both sides has improved the coating situation in some cases.
The U.S. the 4th, 445, No. 458 patents disclosed a kind of have to cut sth. askew reduce the extrusion pressing type bead coating die on surface, this is cut sth. askew and reduces the surface and force boundary force on coating bead downstream and reduced the necessary vacuum values of maintenance bead.The shortcoming and the coating streak that reduce shake is trembled of vacuum are reduced to minimum degree.In order to improve coating quality, must make the inclined-plane with respect to the obtuse angle of fluted shaft line and along the fluted shaft line on inclined-plane towards rim (overhanging) with leave the location optimization of rim (stretching down).This optimization is produced as the needed high-quality of coating emulsion.Yet still lacking is the needed thin layer performance of some coated products.
United States Patent (USP) the 3rd, 413,143 have disclosed the die of two grooves, and too much coating liquid is pumped to coating bead zone by upstream slot.The only about half of fluid that enters is pumped out described bead zone by downstream slot and be left partly to be applied on the motion rim.Too much liquid on bead has a kind of stable effect, thereby has improved performance under the situation without vacuum chamber.Yet it only is 3 the needed performance of coating product that this device is not provided as the wet thickness rate (gap-to-wet-thickness ratio) in some described maximal clearances.
United States Patent (USP) the 4th, 443, disclosed a kind of slidingtype plater for No. 504, be in 35 ° to 50 ° scopes in the angle between a slidingsurface and the horizontal reference plane on this device, and be in 85 ° to 100 ° scopes by formed handover (take off) angle between the tangential and described slidingsurface of relative coating drum.In the time of in running parameter drops on these scopes, just provide a compromise proposal between the performance that obtains by high fluid momentum and the spreading uniformity that all is coated with the power generation by the high fluid that overcomes described slidingsurface along glide direction.Yet, promptly using a vacuum chamber, this device is not provided as the needed performance of some coated products yet.
A common problem that is run into for squash type die coating device is to take place by the streak on the dried coating that liquid residue produced near the die lip the coating bead.This is to exist really for the low-viscosity (mobile) liquid that contains high-volatile solvent especially.The illustrated a kind of scheme that addresses this problem is included in and the fluorine resin overcoat is set to prevent these surperficial coated liquid adhesional wettings on the stamp surfaces adjacent with lip surface in PCT patent application WO93/14878.This has reduced streak, has dripped the percent ripple on wet and limit.Yet overcoat extends on the ripple lip limit, and produces the coarse mechanical matching block that damages easily.
European patent application EP 552653 has illustrated with topped and the sliding coating stamp surfaces it under adjacent with the coating bead in low-energy fluorinated polyethylene surface.Topped is that the 0.05-5.00 millimeter begins and extends and leave the coating bead under spreading lip end.The overcoat of described low-surface-energy separates by a naked bonding jumper and described coating lip are terminal.This has determined the fixedly contact wire of bead.Described low-yield overcoat has been eliminated the coating streak and has been helped cleaning.And for squash type coating die, then do not see and mention this overcoat of use.
Fig. 1 illustrates the coating die 10 of a prior art, and it has a vacuum chamber 12 as the part of metering plater.A kind of coating liquid 14 is accurately fed to the die 10 that is used to be applied to by on the motion rim 18 of a backing roll 20 supportings by a pump 16.Coating liquid is fed to an inlet pipe 24 by a passage 22, is used for distributing and being applied to motion rim 18 by the groove 26 at die.As shown in Figure 2, coating liquid forms a continuous coating bead 28 by groove 26 and between upstream die lip 30 and upstream die lip 32 and rim 18.The width dimensions f of lip 30,32
1And f
2Normally in 0.25 to 0.76 millimeter scope.Vacuum chamber 12 applies a vacuum to stablize bead in the upstream of bead.Though this structure is can be competent at a job but still need a kind of die coating method of improving the known method performance in many cases.
Summary of the invention
A kind of being used for of the present invention is applied to a lip-deep die coating device with fluid coatings, it comprises: a die, it has the downstream stick that a upstream stick and that has a upstream lip has a downstream lip, wherein said upstream lip forms a composition surface, and the downstream lip forms a sharp limit; An and path that between upstream stick and downstream stick, passes die, wherein said path is made up of a groove that is formed by upstream lip and downstream lip, is coated with layer fluid and discharges die to form a continuous coating bead between upstream die lip, downstream lip and coated surface from described groove; Be characterized in that described sharp limit forms the sharp limit radius that is not more than 10 microns.
Of the present inventionly a kind of a fluid coating is applied to a lip-deep method, it comprises: make to be coated with layer fluid by a groove, described groove is by forming with the upstream stick of a upstream lip with the downstream stick of a downstream lip, described upstream lip forms a composition surface, and the downstream lip forms a sharp limit, and wherein said sharp limit forms and is not more than 10 microns radius; And selected in combination with one another groove height H, multiple interocclusal clearance 0 and convergence C.
Brief Description Of Drawings
Fig. 1 is the constructed profile of the coating die of a prior art;
Fig. 2 is the groove of Fig. 1 die and the amplification profile of lip;
Fig. 3 is the profile of a squash type die of the present invention;
Fig. 4 is the groove of Fig. 3 die and the profile through amplifying of lip;
Fig. 5 is the groove of similar Fig. 4 and the profile of lip;
Fig. 6 is the profile that a vacuum chamber that substitutes is arranged;
Fig. 7 is the profile that the another kind of vacuum chamber that substitutes is arranged;
Fig. 8 is the cutaway view of the of the present invention one squash type die that substitutes;
Fig. 9 a and 9b are the profiles through amplifying of groove, surface and the vacuum chamber of the die of Fig. 8;
Figure 10 a and 10b are the schematic diagrames of the die of Fig. 8;
Figure 11 shows the coating test result that the squash type die of the prior art of the coating liquid that is used for 1.8 centipoise viscosity and squash type die of the present invention are carried out the performance comparison;
Figure 12 shows the comparative test result for the coating liquid of 2.7 centipoise viscosity;
Figure 13 is the data summary table that is obtained by coating test;
Figure 14 is used for the curve map of a squash type coating die of the present invention to the constant G/TW line of nine kinds of different coating liquid;
Figure 15 is the drawing in side sectional elevation of a flexible lip bar;
Figure 16 is the profile that is maintained at the film tape on the fixed position by the slight underpressure that applies by the downstream stick;
Figure 17 is the profile on the surface with low-surface-energy overcoat of the present invention's one squash type die;
Figure 18 is the profile through amplifying on a surface that is similar to the present invention's one squash type die of Figure 17;
Figure 19 is the schematic sectional view of another embodiment of the present invention;
Figure 20 is the profile through amplifying of the coating bead of the stamp surfaces of Figure 19 and die.
Describe in detail
The present invention is a kind of die coating method and apparatus, and wherein said die comprises and is set to a sharp limit and the composition surface that can improve and optimize performance.The configuration on described composition surface can be complementary with the shape on the surface of the access areas of coating liquid spreading.Described composition surface can be bent to such an extent that be complementary with the rim that passes through around a backing roll or described composition surface can be flat to match with the free span of rim between two rollers.
Fig. 3 illustrates the squash type die 40 that has a vacuum chamber 42 of the present invention.By a pump 46 coating liquid 14 is supplied with the motion rim 48 that die 40 is supported by a backing roll 50 with spreading.By a passage 52 with coating liquid supply with an inlet pipe 54 with by a groove 56 with its distribution and be applied on the motion rim 48.As shown in Figure 4, coating liquid 14 forms a continuous coated bead by groove 56 and in the middle of upstream die lip 60, downstream die lip 62 and rim 48.Coating liquid can be a kind of of multiple liquid or other fluid.Upstream die lip 60 is parts of upstream stick 64, and downstream stick lip 62 is parts of downstream stick 66.The height of groove 56 can be controlled with a U-shaped pad, and this pad can be made by brass or stainless steel also can be by deckle.Vacuum chamber 42 applies vacuum with the stable coatings bead in the upstream of bead.
As shown in Figure 5, upstream lip 60 forms the composition surface 68 of a bending, and downstream lip 62 forms a sharp limit 70.This configuration is compared with the plater of the die pattern of prior art and has been improved overall performance.Performance through improving show can allow with the rim rotating speed that improves and increase be coated with the lamellar spacing and with bigger coating liquid viscosity work and produce the wet coating layer thickness that approaches.
Described sharp limit should be cleaning and do not have crack and burr, and the nonstraightness on its per 25 centimetre lengths is no more than 1 micron.The radius on point limit should be not more than 10 microns.This limit can be formed by an acute angle as shown in the figure or can be formed by a right angle or obtuse angle, and an inclined-plane can be arranged or do not have the inclined-plane.Perhaps, this limit can be formed by one " sagging nose " (" drop nose ") on an extension of downstream lip 62, and this nose narrows down groove 56.How the structure of tube edge does not all require suitable multiple interocclusal clearance to keep performance.The radius that the radius on crooked composition surface 68 should equal backing roll 50 adds a minimum being used to be coated with lamellar spacing and tire thickness, and 0.13 millimeter non-critical surplus.Perhaps, the radius on crooked composition surface 68 can surpass the radius of backing roll 50, and can adopt pad to make the composition surface with respect to rim 48 orientation.Can be by having the given convergence C that realizes with the composition surface of backing roll same diameter by approaching with the composition surface that have greater than the diameter of backing roll by the method on pad control composition surface.
Fig. 5 also illustrates the size of how much running parameters that are used for the individual layer extruding.The length L on the crooked composition surface 68 on upstream stick 64
1Can be in 1.6 millimeters to 25.4 millimeters scope.Comparatively ideal length L
1It is 12.7 millimeters.The corner A of downstream stick 66
1Can be in 10 ° to 75 ° scope, and more satisfactory be 60 °.The point limit 70 the limit radius should approximately be 2 microns to 4 microns and more satisfactory be less than 10 microns.The downstream of coating groove 56 stick 66 surface with can be in 30 ° to 150 ° scope by the die angle of attack A2 between the tangential plane P of parallel on rim 48 a surfaces and direct straight line with respect to sharp limit 70, and more satisfactory be 90 ° to 95 °, for example 93 °.Coating clearance G 1 is the vertical range between sharp limit 70 and rim 48.(being coated with lamellar spacing A1 is to measure on sharp limit, but separates being expressed as with sharp limit for the purpose of clear for drawing among some figure.Always no matter the position of G1 how one and because rim is crooked gap when sharp limit is left in the rim motion is that a gap of increase is measured on sharp limit in the accompanying drawings.)
The groove height H can be in 0.76 millimeter to 3.175 millimeters scope.The sharp limit that multiple interocclusal clearance 0 is a downstream stick 66 obtains in downstream side 72 positioning control with respect to crooked composition surface 68 on upstream stick 64 on the direction of rim 48.Multiple interocclusal clearance can regard also that for any given coating clearance G 1 downstream side 72 on crooked composition surface 68 leaves an indentation distance of rim 48 with respect to sharp limit 70 as.Multiple interocclusal clearance can be in 0 millimeter to 0.102 millimeter scope, and the adjusted value on two opposite ends of die groove should be in mutual 2.5 microns.For example just need an accurate erecting device that is used for this plater for the uniformity that reaches accurate interocclusal clearance again.Convergence C is as shown in Figure 5, and a counterclockwise angle orientation of a position paralleling (or concentric) with rim 48 is left on crooked composition surface 68, and downstream side 72 is pivots.Convergence can be in 0 ° to 4.58 ° scope, and should be in mutual 0.023 ° in the positioning control on the opposite end of die groove.The for example viscosity influence enforcement of the performance and the method for die coating device of described groove height, multiple interocclusal clearance and convergence and fluid behaviour.
From the overall performance viewpoint, be 1000 centipoises or less than the liquid of 1000 centipoises, comparatively it is desirable to the groove height is 0.18 millimeter for viscosity, multiple interocclusal clearance is 0.076 millimeter, and convergence is 0.57 °.Adopt the approaching same performance level of performance level possibility of other groove height.Can also find that performance is more satisfactory during greater than 1000 centipoises in viscosity.If when will degree of convergence remaining on 0.57 °, then other best groove height and multiple interocclusal clearance combination are as follows:
The multiple interocclusal clearance of groove height
0.15 0.071 millimeter of millimeter
0.20 0.082 millimeter of millimeter
0.31 0.100 millimeter of millimeter
0.51 0.130 millimeter of millimeter
In the aforesaid liquid range of viscosities, for any given convergence value, it seems that best multiple interocclusal clearance value be the square root that directly is proportional to the high value of groove.
As shown in Figure 6, vacuum chamber 42 can be an integral part of upstream stick 64 or be clamped on the upstream stick 64 with allow accurately, vacuum plant gas flow repeatably.Vacuum chamber 42 adopts a vacuum stick 74 to constitute and is connected with a vacuum source passage 80 with a vacuum inlet pipe 78 by an optional vacuum choke valve 76.The vacuum engagement face 82 of one bending can be an integral part of upstream stick 64 or a part that is fixed on the vacuum stick 74 on the upstream stick 64.Vacuum engagement face 82 has the bending radius identical with crooked composition surface 68.Described crooked composition surface 68 and vacuum engagement face 82 can be finish grinded together so that their mutual " alignment " (" in line ").Vacuum engagement face 82 has the identical convergence C with respect to rim 48 with crooked composition surface 68 then.
Vacuum engagement face clearance G 2 is to be in vacuum engagement face 82 in vacuum engagement face 82 bottoms and the distance between the rim 48 and is the summation of coating clearance G 1, multiple interocclusal clearance 0 and the displacement that caused by the convergence C on crooked composition surface 68.(no matter the position of G1 how in the drawings, always the bottom of described gap vacuum engagement face and the vertical range between the rim).If vacuum engagement face clearance G 2 is bigger, then the situation that surrounding air flows into vacuum chamber 42 too much can take place.Though vacuum source can have compensation and remain on the specified vacuum stress level at vacuum chamber 42 places, the inflow of air still can make coating performance degenerate.
In Fig. 7, vacuum engagement face 82 is parts of the vacuum stick 74 that connects mutually with upstream stick 64.In manufacture process, crooked composition surface 68 is polished with convergence C " mill advances ".Connect vacuum stick 74 then and adopt different grinding center correct grinding vacuum engagement face 82 so that vacuum engagement face 82 parallels with rim 48 and when needed answer the interocclusal clearance value when being set vacuum engagement face clearance G 2 equal coating clearance G 1.Vacuum engagement face length degree L
2Can be in 6.35 millimeters to 25.4 millimeters scope.Comparatively ideal length L
2It is 12.7 millimeters.Present embodiment has the Bulk coat performance bigger than Fig. 6 embodiment in the coating situation of difficulty, but for the condition of work of a certain regulation it all the time will be through correct grinding.Like this, when coating clearance G 1 or multiple interocclusal clearance O were changed, vacuum engagement face clearance G 2 can be with from its optimum value.
In Fig. 8 and 9, the upstream stick 64 of die 40 is mounted on the upstream stick locator 84, and vacuum stick 74 is mounted on the vacuum stick locator 86.Directly be not connected mutually with vacuum engagement face 82 on vacuum stick 74 on the crooked composition surface 68 on the upstream stick 64.Vacuum chamber 42 be by vacuum stick 74 with repay device 86 surely and be connected with its straight empty source.To the installation of vacuum stick 74 and location is to close with the peace of upstream stick 64 and locate and separate.This has just improved the performance of die and has allowed the accurate repeatably gas flow of vacuum plant.This firm structure of vacuum bar block assembly is compared with the device of prior art and is also helped to improve performance.In addition, this structure that is used for vacuum stick 74 can be improved the plater of other prior art, for example the performance of slot type, squash type and slidingtype plater.One flexible vacuum seal bar plays sealing function between upstream stick 64 and vacuum stick 74.
The influence that clearance G 2 between vacuum engagement face 82 and rim 48 is not changed by coating clearance G 1, multiple interocclusal clearance 0 or convergence C, and in coating procedure, can be maintained at continuously on its optimum value.The vacuum engagement face can be set in 0.076 millimeter to 0.508 millimeter the scope indirectly.The more satisfactory value that is used for clearance G 2 is 0.15 millimeter.Comparatively ideal angle to vacuum engagement face 82 is to parallel with rim 48 surely entirely.
In coating procedure, vacuum level is adjusted to the coating that can obtain desirable quality.When with a kind of 2 centipoise coating liquids of the rim rotating speed spreading of 6 microns wet layer thicknesses and 30.5 meters/minute, typical vacuum level is 51 millimeters of water.Reduce wet layer thickness, increased viscosity or improve the higher vacuum level that the rim rotating speed just needs to surpass 150 millimeters of water.The device of the relative prior art of die of the present invention has the satisfied vacuum level of lower minimum and the maximum satisfied vacuum level of Geng Gao and in some cases can be with impossible zero vacuum work of prior art device.
Figure 10 a and 10b illustrate the closed scheme of some location adjustment and vacuum chamber.Multiple interocclusal clearance adjustment make downstream stick 66 with respect to 64 translations of upstream stick so that sharp limit 70 with respect to the downstream side 72 on the composition surface 68 of bending towards rim 48 or leave rim 48 motions.Adjusting convergence makes upstream stick 64 and downstream stick 66 together around passing through the axis rotation that downstream bar 72 rotates, so that bending engages and leaves the direction that parallels with rim 48 from position shown in Figure 10 and move or move backward towards described parallel direction.Be coated with the lamellar spacing adjustment and make upstream stick 64 and downstream stick 66 change distance between sharp limit 70 and the rim 48 together, and the vacuum stick that is in course of adjustment remains fixed on its bearing 86 and 88 deflections of vacuum seal bar are leaked to prevent air.The air that enters vacuum chamber 42 at place, die two ends leaks and is reduced to minimum degree by means of the end plate 90 that is installed in stick 64 two ends in topped upstream on vacuum stick 74 two ends.The vacuum stick is than long 0.10 millimeter to 0.15 millimeter of upstream stick 64, and like this under the state of centring, the gap between every end plate 90 and upstream stick 64 will be dropped in 0.050 millimeter to 0.075 millimeter the scope.
In coating procedure, observed a beyond thought operating characteristic.Even increase vacuum, bead are moved in the space between crooked composition surface 68 and motion rim 48 also not obviously.This just allows to adopt the higher vacuum level that can reach than the squash type plater with prior art, correspondingly, just can provide higher performance level.Even requiring very little or do not having the occasion of vacuum, the present invention also presents the performance above the improvement of prior art device.Bead and the not obvious this situation that is moved into the space between crooked composition surface 68 and rim 48 mean that also on backing roll 50 " outflows " (" runout ") is tantamount to the squash type of prior art is coated with the effect of propping up device to the effect of downstream coating weight.
Present in diagrammatic form out the coating test result of prior art extruding die and squash type die performance of the present invention comparison of Figure 11.In these trials, the coating liquid that contains a kind of 1.8 centipoises of organic solvent is applied on the common polyester film rim.The performance criterion standard is the minimum wet layer thickness when four kinds of different coating gaps that surpass 15 to 60 meters/minute ranges of speeds to first kind of two kinds of platers.Curve A, B, C and D adopt the die of known prior art, and are coated with 0.254 millimeter, 0.203 millimeter, 0.152 millimeter and 0.127 millimeter that the lamellar spacing finishes respectively.Curve E, F, G and H adopt mould of the present invention to finish when being coated with the lamellar spacing separately identical.Compare with the die of technology, lower wet thickness level of the present invention is conspicuous.Figure 12 is illustrated in identical comparative test result for a kind of similar coatings liquid of 2.7 centipoise viscosity when being coated with the lamellar spacing.Equally, performance advantage of the present invention also can be clear that.
Figure 13 is by being applied to the data summary table that the coating test on the common polyester film rim obtains with seven kinds of different viscosities and the liquid that contains different organic solvents.These results have compared the plater (PRIOR) of prior art and the present invention's (NEW) performance.The performance criterion standard is mixed.Feature performance benefit of the present invention can be at rim rotating speed (V
w), wet layer thickness (T
w), be coated with the lamellar spacing, find out in vacuum level or their combination.
A measured value of coating performance is the ratio (G/TW) that is coated with lamellar spacing and wet layer thickness for specific coating liquid and rim rotating speed.Figure 14 illustrates a series of constant G/TW lines and the viscosity number of a squash type die of the present invention for nine kinds of different coating liquid.On at the bottom of when 30.5 meters/minute rim rotating speed, liquid being coated at common polyester film.Because but some viscosity numbers that influence of other spreading performance factor be it seems not ideal enough.After from Figure 11 and 12,30.5 meters/minute rim tachometers being calculated G/TW, four additional properties curves have been added.From top to bottom, the performance curve of solid line be with prior art extruding die spreading for the G/TW value of 2.7 centipoises and 1.8 centipoise liquid with the G/TW value for the liquid of 2.7 centipoises and 1.8 centipoises of extruding die spreading of the present invention.Performance curve of the present invention shows that its G/TW value is bigger than the G/TW of the performance curve of the coating die of prior art.In addition, being used for performance curve of the present invention is respectively the performance curve of 18.8 and 16.8 constant G/TW near mean value.The performance curve of the plater of prior art is presented at that the G/TW value has sizable variation on their length direction.The present invention can remain on a coating bead on the less wet depth thickness to improve a lot of operating characteristic than the prior art device.
For the replacing on the multiple interlock limit that helps damaging, can adopt some schemes of machined broken that substitute.Figure 15 illustrates one and is clamped at the removable flexible strip 350 between the two downstream sticks on the coating groove.Described flexible strip can be stainless steel clearance gauge blank or other metal or plastic sheeting and can use on any embodiment of the present invention.One clamping device that is used for grinding point limit on stainless steel clearance gauge blank can make burr be reduced to minimum degree at grinding process.Figure 16 illustrates by the little vacuum that is applied by the downstream stick and is maintained at flexible strip on the fixed position.In another alternate embodiment, can produce sharp limit with a thin stainless steel wire.Described steel wire can be stretched.
The common issue with that the squash type die of prior art is run into is to produce the striped that is caused by the dried liquid residue near the die lip the coating bead in coating.This is more ubiquitous for the low-viscosity (mobile) liquid that contains a kind of high volatile volatile solvent.In Figure 17, low-surface-energy overcoat 260 is applied on the surface of the downstream stick 66 adjacent with sharp limit and is applied on the crooked composition surface 68 adjacent with its downstream side 72.This overcoat can be a kind of fluorinated polyethylene, even and be applied to and a kind ofly also be and common corrugated surface on the metal bottom flooring of precision mill.Accurately be set on the die in 2.5 microns if multiple interocclusal clearance 0 is side offside ground, then can obtain optimal result.
In the embodiment of Figure 18, low-surface-energy overcoat 260 does not extend on limit 70 and 72.These overcoats 260 can be used as a lining 262 and are applied in, the formation step of described lining is by cut-in groove on crooked composition surface 68, the low-surface-energy material that applies excess makes it to fill up groove, the whole crooked composition surface of circular arc grinding then is so that narrow bonding jumper 264 is concordant with the topped lining 262 of " not bedewing ".The degree of depth of lining 262 can be in 0.013 millimeter to 0.127 millimeter scope.The width of fillet 264 can be in 0.127 millimeter to 0.762 millimeter scope.The lining of one similar low-surface-energy can produce on upstream stick 66 surfaces from 0.127 millimeter to 0.762 millimeter on contained side.Since adopt through accurate grinding with limit 70 and 72 adjacent bars 264, this is with regard to the precision adjustment of convenient multiple interlock and can protect the low-surface-energy layer to exempt to damage and separate.
Figure 19 and 20 illustrates a device of the present invention that is used for die coating, too much coating liquid is measured continuously from die 270 and is infeeded the coating bead in this device, and some are coated with layer fluid and measure outflow with gradually reducing, and being applied to motion with the liquid with ormal weight changes on the hoop.By pump 272 coating liquid 14 is supplied with die 270, and coating liquid is returned in the liquid memory 274 by one second pump 276.Utilize a stable vacuum chamber 278, the coating liquid that die 270 will accurately measure quantity delivered is applied on the rim 48 of motion on the backing roll 280.
One upstream stick, 282, one a middle stick 284 and a downstream stick 286 are in the face of rim 48.Coating liquid 14 is pumped to inlet pipe 290 and enters the coating bead by a mobile groove 292 by a feed pathway 288.Simultaneously, the coating liquid of a scheduled volume is pumped out by a drain tank 294 that the coating bead enters discharge pipe 296 and by a passing away 298.The coating liquid that is retained in the bead is applied on the motion rim 48.This device will surpass the device of prior art on performance.
In an example, wherein when supplying with groove 292 and be 135 ° by the angle of attack A2 between the tangential plane P of coating bead, and the angle of attack A5 between drain tank 294 and tangential plane P is when being 115 °, and then the die parameter is set as follows.Supplying with groove 292 highly is 0.15 millimeter, and its multiple interocclusal clearance (medial side 300 of comparing with the downstream side 72 on crooked composition surface) is 0.0 millimeter.Drain tank 294 is 0.076 millimeter, and its multiple interocclusal clearance (downstream side 70 of comparing with medial side 300) is 0.076 millimeter.The width that crosses rim of drain tank 294 is that 3.2 millimeters (less than width of supplying with groove 292) are to eliminate the air entrainment in bead.Convergence C is 0.23 °.When with the liquid of 30.5 meters/minute a kind of 2 centipoises of rim rotating speed spreading, wet layer thickness TW is 0.020 millimeter, and coating clearance G 1 is 0.20 millimeter (G/TW=10).In this example, 154% of coating liquid requirement is passed through supply pump 272 supplies, and 35% (removing whole plussage) of total amount is drawn out of by excavationg pump 276.When with 15.2 meters/minute rim rotating speed spreadings, wet layer thickness TW is 0.0076 millimeter, and coating clearance G 1 is 0.20 millimeter (G/TW=26.3), and 558% the supplying with by supply pump 272 of coating liquid requirement, and 82% the extracting out by excavationg pump 276 of total amount.Coating is smooth and estriate.
Perhaps, the angle of attack A2 between supply groove 292 and tangential plane P is in 90 ° to 135 ° scope, and the angle of attack A5 between drain tank 294 and tangential plane P can be in 60 ° to 115 ° scope.In addition, the vacuum stick can be installed dividually and adjust with upstream stick 282.
Claims (17)
1. one kind is used for fluid coatings is applied to a lip-deep die coating device, and it comprises:
One die (40), it has the downstream stick (66) that a upstream stick (64) and that has a upstream lip (60) has a downstream lip (62), and wherein said upstream lip forms a composition surface (68), and the downstream lip forms a sharp limit (70); With
One passes the path of die (40) between upstream stick (64) and downstream stick (66), wherein said path is made up of a groove (56) that is formed by upstream lip (60) and downstream lip (62), is coated with layer fluid (14) and discharges die to form a continuous coating bead (58) between upstream die lip, downstream lip and coated surface from described groove;
It is characterized in that described sharp limit (70) forms the sharp limit radius that is not more than 10 microns.
2. die coating device as claimed in claim 1 is characterized in that, locate to produce a multiple interocclusal clearance O with respect to the downstream side of composition surface (68) on described sharp limit (70).
3. die coating device as claimed in claim 1 is characterized in that, described composition surface (68) are left and paralleled with rim or locate a concentric position angledly, and with the downstream side on composition surface as pivot.
4. die coating device as claimed in claim 1 is characterized in that, if the coating layer thickness from the teeth outwards of the gap between described sharp limit and described surface is more than 10 times.
5. die coating device as claimed in claim 1, it is characterized in that, it also comprises and being used for by changing the device that one of groove height H, multiple interocclusal clearance 0 and convergence C improve coating performance at least, described groove height, multiple interocclusal clearance and convergence are chosen in combination with one another, wherein, the length L of composition surface (68)
1, downstream stick (66) corner A1, be chosen in combination with one another on the downstream of coating groove stick surface with by die angle of attack A2 between the tangential plane of a straight line parallel with sharp limit (70) and direct relative on by the spreading surface and the interlamellar spacing G that is coated with between sharp limit and coated surface.
6. die coating device as claimed in claim 1 is characterized in that, the shape of described composition surface (68) is consistent with the shape on coated surface.
7. die coating device as claimed in claim 1 is characterized in that, it comprises also and be used for applying a vacuum to stablize the device of bead in the upstream of bead (58) that it comprises that one has the vacuum chamber (42) as the vacuum engagement face (82) of its upstream sealing.
8. die coating device as claimed in claim 7, it is characterized in that, described composition surface (68) and vacuum engagement face (82) are crooked and have same bending radius, described vacuum engagement face is concentric with described composition surface and have an identical convergence C with respect to coated surface that forms the composition surface, described vacuum engagement mask has the zero convergence on coated relatively surface, and the composition surface is to assemble with respect to coated surface with the constant set value.
9. die coating device as claimed in claim 1 is characterized in that, described downstream lip (62) comprises a removable flexible strip (350).
10. die coating device as claimed in claim 9 is characterized in that, described removable flexible strip (350) is maintained on the fixed position on the coating groove by means of the little vacuum that is applied in by downstream stick (66).
11. die coating device as claimed in claim 1 is characterized in that, described downstream lip (62) is made up of a fine wire that stretches.
12. die coating device as claimed in claim 1 is characterized in that it also comprises:
One is applied to the lip-deep low-surface-energy overcoat (260) of the downstream stick (66) adjacent with described sharp limit (70), and one be applied to the low-surface-energy overcoat (260) that is common waveform surface on the composition surface adjacent with its downstream side (68), and described two low-surface-energy overcoats not exclusively extend on the limit on downstream stick and composition surface.
13. one kind is applied to a lip-deep method with a fluid coating, it comprises:
Make and be coated with layer fluid (14) by a groove (56), described groove is by forming with the upstream stick (64) of a upstream lip (60) with the downstream stick (66) of a downstream lip (62), described upstream lip forms a composition surface (68), and the downstream lip forms a sharp limit (70), and wherein said sharp limit (70) forms and is not more than 10 microns radius; And
Selected in combination with one another groove height H, multiple interocclusal clearance O and convergence C.
14. method as claimed in claim 13 is characterized in that, it also comprises and described sharp limit is arranged on to leave described surface be that the distance of described lip-deep coating layer thickness more than 10 times is last.
15. method as claimed in claim 13 is characterized in that, it also comprises the length L on selected composition surface (68) in combination with one another
1, downstream stick (66) corner A1, on the downstream of coating groove stick surface with by the die angle of attack A2 between the tangential plane parallel with sharp limit and a directly relative straight line on by the spreading surface, and on sharp limit be coated with interlamellar spacing G between the spreading surface.
16. method as claimed in claim 13 is characterized in that, the upstream that it also is included in bead (58) applies a vacuum to stablize the step of bead.
17. method as claimed in claim 13 is characterized in that, it also comprises shape selected and the corresponding to composition surface of coated surface configuration (68).
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23655194A | 1994-04-29 | 1994-04-29 | |
| US08/236,570 US5759274A (en) | 1994-04-29 | 1994-04-29 | Die coating apparatus with surface covering |
| US08/236,635 US5639305A (en) | 1994-04-29 | 1994-04-29 | Die coating method and apparatus |
| US08/236,635 | 1994-04-29 | ||
| US08/236,570 | 1994-04-29 | ||
| US08/236,551 | 1994-04-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1147218A CN1147218A (en) | 1997-04-09 |
| CN1067299C true CN1067299C (en) | 2001-06-20 |
Family
ID=27398873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95192830A Expired - Fee Related CN1067299C (en) | 1994-04-29 | 1995-03-16 | Die coating method and apparatus |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0757597B1 (en) |
| JP (1) | JP3766097B2 (en) |
| KR (1) | KR100329583B1 (en) |
| CN (1) | CN1067299C (en) |
| BR (1) | BR9507567A (en) |
| CA (1) | CA2187895A1 (en) |
| DE (1) | DE69511856T2 (en) |
| MX (1) | MX9605132A (en) |
| WO (1) | WO1995029764A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6168682B1 (en) | 1998-02-10 | 2001-01-02 | 3M Innovative Properties Company | Method of manufacturing an optical recording medium |
| US7097673B2 (en) | 2001-06-07 | 2006-08-29 | 3M Innovative Properties Company | Coating edge control |
| US6813820B2 (en) | 2001-12-19 | 2004-11-09 | 3M Innovative Properties Company | Method of improving coating uniformity |
| US20030157252A1 (en) | 2002-01-09 | 2003-08-21 | Yasuhiko Tokimasa | Apparatus and method for applying coating solution, die and method for assembling thereof |
| US8178166B2 (en) | 2002-01-09 | 2012-05-15 | Fujifilm Corporation | Apparatus and method for applying coating solution, die and method for assembling thereof |
| US6720025B2 (en) | 2002-07-01 | 2004-04-13 | 3M Innovative Properties Company | Slot extrusion coating methods |
| WO2005028123A1 (en) | 2003-09-17 | 2005-03-31 | 3M Innovative Properties Company | Methods for forming a coating layer having substantially uniform thickness, and die coaters |
| JP4382620B2 (en) * | 2004-09-27 | 2009-12-16 | 富士フイルム株式会社 | Optical compensation sheet, elliptically polarizing plate, and liquid crystal display device |
| JP4841822B2 (en) | 2004-09-30 | 2011-12-21 | 富士フイルム株式会社 | Manufacturing method of web with coating film |
| WO2006095928A1 (en) | 2005-03-10 | 2006-09-14 | Fujifilm Corporation | Optical compensation film, polarizing plate and liquid crystal display |
| US8771793B2 (en) | 2011-04-15 | 2014-07-08 | Roche Diagnostics Operations, Inc. | Vacuum assisted slot die coating techniques |
| JP6904770B2 (en) * | 2017-04-25 | 2021-07-21 | 株式会社ヒラノテクシード | Web cooling system |
| CN111468371B (en) * | 2020-03-31 | 2022-07-08 | 中国建筑材料科学研究总院有限公司 | Method and device for preparing protective film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3413143A (en) * | 1963-12-10 | 1968-11-26 | Ilford Ltd | High speed coating apparatus |
| GB2120132A (en) * | 1982-05-19 | 1983-11-30 | Konishiroku Photo Ind | Extrusion coating apparatus |
| EP0196029A2 (en) * | 1985-03-22 | 1986-10-01 | Union Carbide Corporation | Vacuum guide used in flexible sheet material treatment |
| EP0466420A2 (en) * | 1990-07-10 | 1992-01-15 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Fountain coater |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE416970C (en) * | 1977-01-03 | 1984-12-11 | Inventing Ab | SET FOR TREATING OR COATING SURFACES, EXAMPLE OF CURRENT MATERIALS |
| JPH0677711B2 (en) * | 1986-07-15 | 1994-10-05 | 富士写真フイルム株式会社 | Coating device |
| DE4035091A1 (en) * | 1990-11-05 | 1992-05-07 | Pagendarm Gmbh | APPLICATION DEVICE |
| DE9112589U1 (en) * | 1991-10-10 | 1991-12-12 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
| US5380365A (en) * | 1992-01-21 | 1995-01-10 | E. I. Du Pont De Nemours And Company | Lip surface geometry for slide bead coating |
| DE4303357A1 (en) * | 1993-02-05 | 1994-08-11 | Hoechst Ag | Coating device for applying thin wet films |
-
1995
- 1995-03-16 CN CN95192830A patent/CN1067299C/en not_active Expired - Fee Related
- 1995-03-16 BR BR9507567A patent/BR9507567A/en not_active IP Right Cessation
- 1995-03-16 WO PCT/US1995/003312 patent/WO1995029764A1/en active IP Right Grant
- 1995-03-16 DE DE69511856T patent/DE69511856T2/en not_active Expired - Fee Related
- 1995-03-16 KR KR1019960706091A patent/KR100329583B1/en not_active IP Right Cessation
- 1995-03-16 EP EP95914074A patent/EP0757597B1/en not_active Expired - Lifetime
- 1995-03-16 CA CA002187895A patent/CA2187895A1/en not_active Abandoned
- 1995-03-16 JP JP52820895A patent/JP3766097B2/en not_active Expired - Fee Related
- 1995-03-16 MX MX9605132A patent/MX9605132A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3413143A (en) * | 1963-12-10 | 1968-11-26 | Ilford Ltd | High speed coating apparatus |
| GB2120132A (en) * | 1982-05-19 | 1983-11-30 | Konishiroku Photo Ind | Extrusion coating apparatus |
| EP0196029A2 (en) * | 1985-03-22 | 1986-10-01 | Union Carbide Corporation | Vacuum guide used in flexible sheet material treatment |
| EP0466420A2 (en) * | 1990-07-10 | 1992-01-15 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Fountain coater |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970702759A (en) | 1997-06-10 |
| WO1995029764A1 (en) | 1995-11-09 |
| CA2187895A1 (en) | 1995-11-09 |
| DE69511856T2 (en) | 2000-02-24 |
| EP0757597A1 (en) | 1997-02-12 |
| BR9507567A (en) | 1997-08-05 |
| JP3766097B2 (en) | 2006-04-12 |
| CN1147218A (en) | 1997-04-09 |
| DE69511856D1 (en) | 1999-10-07 |
| MX9605132A (en) | 1997-08-30 |
| EP0757597B1 (en) | 1999-09-01 |
| JPH09511682A (en) | 1997-11-25 |
| KR100329583B1 (en) | 2002-08-24 |
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