JPS5853582B2 - Coating method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION SUMMARY OF THE INVENTION A method and apparatus for coating both sides of a web of indefinite length substantially simultaneously.

The material to be wound is fed in an upward direction and passes between a pair of coating members.

The coating material is supplied through an elongated groove, and the coating members are arranged opposite to each other in the direction of movement of the web.

An excess amount of paint is applied to form a pool in the gap defined by the opposing surface of the web and the spread surface or lip of each coated member to ensure uniform coating of the surface.

The hydraulic pressure exerted by the liquid composition passing between the spread surface of the coated member and the web material contributes to stabilization of the web material and reduces oscillation of the web material.

The spread surfaces of the coating member are arranged in a zigzag manner with respect to the direction of movement of the web material, and are preferably arranged so as to overlap each other, so that the path of the web material in the area of the coating member deviates from a hypothetical straight line. and some tension beyond the spread surface to advantageously compensate for irregularities in the spread surface.

The present invention relates to a coating method and apparatus, and more particularly to a novel method and apparatus for coating both sides of a web material substantially simultaneously in a controlled and constant manner.

There are many applications where it is desired to coat both sides of the rolled material.

In the prior art, the web is coated with paint by moving the web substantially vertically upwardly between a pair of opposing coating members.

The coating members are rigid and arranged with respect to the web to provide a gap between the engaging surface of the web and each coating member such that each surface of the web and the engagement displacement surface of the coating member A paint retention area is formed in the gap between the two.

The hydraulic pressure created by the movement of the web and paint serves to stabilize the web as it passes through each coating member and to prevent wobbling or vibration of the web as it moves between coating members.

The web is coated with an excess of paint, which is evenly spread and then removed from the web by continuous operation with a typical pair of opposing flexible blades consisting of a pair of thin steel blades arranged in line with each other. Excess paint scraped from each surface of the web and removed from the web on both sides of the web is returned to the device.

Typically, excess paint is mixed with new paint before reuse.

A careful look at the above-mentioned equipment shows that the distance between the coated parts is very important.

This distance must be adjusted with respect to the thickness of the web and the amount of paint applied to the surface of the web.

This results in the desired excess -1J: adhering to the web.

These adjustments thus introduce many complications.

For example, if excess paint is to be retained at the initial application site, the opposing application members must be set relatively close to each other.

This is because the coating members are rigid to prevent any instability of the web during coating, and thicker sections of the web caused by the presence of lumps or other impurities are in the passage between opposing rigid coating members. During placement, the web thus breaks or tears.

Additionally, the techniques applied to the manufacture of rigid coated members include producing rigid coated members having sufficiently straight and flat planes along the coated member portions to control excessive paint spreading. Therefore, it must be extremely precise.

For example, a serious problem arises if the coating member force has a length of three meters or more measured perpendicular to the direction of web travel.

Even assuming that precise manufacturing techniques are used, temperature variations in the paint used are known to produce deviations (i.e., "deviations") in the straight, flat surfaces of the coated parts.

Such deviations in the contact surface leave uncoated areas on the web.

This is because the stagnation crabs that form in the gap between the web and the coating member can temporarily disappear due to deviations, especially when using a relatively small excess of paint.

The application of paint to each surface of the web material through an outlet opening having a groove along the contact surface of the coating member facing the web material and the contact surface of said coating member in the direction of travel of the web material The object of the present invention is to provide a method and a device which eliminates the above-mentioned drawbacks by spacing between the two.

That is, according to the invention, instead of using the prior art in which opposing coating member parts are arranged directly opposite each other, it is proposed that the coating members are arranged displaced relative to each other with respect to the direction of movement of the web material. , this arrangement significantly reduces the need for perfectly straight contact surfaces of the coated member and further serves to reduce the stringent requirements required to manufacture prior art coated members.

In one embodiment of the invention, the suitable contact surface location with respect to the coating material supply and the mating surface of the web material is immediately before the gap between the contact surface of each coating member and the mating surface of the web material. Excessive paint retention part-25: is set to be formed.

The hydraulic pressure created by the movement of the web material and the paint placed on it helps to stabilize the web material so that it floats and floats between the opposing layers of paint and the paint acts just like a lubricant. It acts to facilitate smooth and stabilized passage of the rolled material between the coated members.

The initial moving direction of the rolled material is changed when the rolled material passes through each coating member, and this movement direction change is performed by displacing the coating member in contact with the rolled material in the lateral direction, and The coating results are further improved if the displacement is perpendicular to the normal direction of movement of the web material.

It has been found that this deflection of the web material further enhances the stability of the web material, so that the apparatus promoted by the present invention has the ability to evenly spread the paint and scrape off excess. This is an important element when used as a first coating station located upstream of the opposing flexible dome.

It is extremely important that the web material be stabilized prior to passing between the flexible doctors, as this will prevent destabilization or agitation of the web material as it passes through the first coating station. The resulting vibrations etc. may displace the flexible dowel from the desired position resulting in an uneven and therefore unacceptable coating layer.

According to another embodiment of the invention, the entire coating process can be effectively controlled by adjustable displacement of the coating member after it has been properly positioned relative to the fabric web.

As mentioned above, it is necessary to form a retention area of paint to ensure a uniform coated layer with no uncoated layer.

This can be achieved, for example, by the use of a rotatable applicator with an elongated feed groove, which rotatable applicator can be adjusted to set the feed groove at a suitable angle with respect to the web material. so that the desired amount of paint can be applied to the fabric web and the appropriate amount of paint -! J: Supplied to form a retention area, allowing a certain excess amount of paint to drip downward from the retention area.

Complete control of this application process is thus obtained by adjusting the applied paint and locating the feed channel at the appropriate angle to the web.

The invention also provides grooves for the paint which are placed in the contact surfaces of the coating members arranged against each surface of the web and by rocking the contact surfaces with respect to the path of travel of the web. Also contemplated is a device that accomplishes the foregoing method through the use of an exit aperture having an outlet opening.

Further, in the present invention, the contact surface of one coating member is arranged so as to overlap the opposing contact surface of the other coating member at a position L2, and the moving path of the rolled material is displaced as it passes through each contact surface. To achieve this, the web material is characterized in that it moves in an undulating or "zigzag" manner as it passes through the first coating station.

The contact surface of each application member is in the form of a pair of lips which surround and define a feed channel and an outlet opening for the paint and are inclined in the direction of the web.

In another preferred embodiment of the invention, the contact surface of the coating member comprises tubular members extending substantially over the entire width of the web, each tubular member having an elongated groove outlet for supplying the coating material. It includes an aperture, the outlet aperture extending substantially across the entire width of the wound material.

Preferably, the tubular member is pivoted and arranged for directional adjustment of the outlet opening, which directional adjustment can be effected independently of said rotatably adjustable tubular member.

If you want to give an uncoated edge along each line of the web material,
An adjustable partition is disposed in the outlet opening and is adjustable for displacement within the groove at its outlet opening end.

The paint distribution chambers are preferably spaced apart along the length of the contact member in order to avoid uneven application of the web material due to a drop in paint pressure when moving in the direction of the web oblique outlet opening. and are connected by a number of supply pipes to an internal chamber in the lower part of each coating member, which internal chamber preferably has a larger volume than the distribution chamber.

The supply tube is preferably made of flexible plastic tube or the like.

Coated parts: To prevent clogging and dirt,
The part of the coated member comprising the contact surface is pivoted in a holder with an intermediate seal.

A top cover plate is placed above each contact area to protect the contact area from excess paint and to remove paint from the top of the web as it leaves the first coating station. It can also be dripped into.

Next, the present invention will be explained in detail with reference to the drawings.

In FIG. 1, the web 1 moves in an upward vertical direction indicated by arrow A. In FIG.

The raw web material is fed from a supply reel, typically located on the underside of the apparatus of FIG. The processed material is moved by winding it onto a winding reel.

Furthermore, this device may be provided with other guide rollers, drying devices, etc.25, but these are omitted here for the sake of clarity.

The rolled material 1 moves upward between coating members 2.3 arranged on both sides thereof.

The coating members 2, 3 are pivoted about longitudinal axes 4a, 5a by their free ends 75: such as elongated shafts 4, 5 which are pivoted in suitable bearings (not shown).

The respective contact surfaces 6, 7 are adjusted by coarse and fine adjustment devices.
The coating member is rotatable in order to accurately determine the position of the coating member.

The coating members 2, 3 are each provided with a hollow internal chamber (8.9°) for accommodating paint which is supplied by suitable conduits (not shown).

Each hollow internal chamber 8°9 has a hollow internal chamber 8, 9 and a contact surface 6,
Supply routes io, iii communicating with 7: are provided,
This supply route io, 1i is connected to each village at 14-15, 16.
-17 with an elongated groove located between the outlet openings 12.
It ends at 13.

The contact surfaces of lips 14-15 and 16-17 are
is slightly inclined with respect to the direction of movement.

The coating members 2, 3 are preferably set in engagement with each other, so that the outlet openings 12, 13 and the pair of glue tabs 14-15 and 16-17 are arranged staggered with respect to the path of travel of the web 1. Furthermore, each contact surface is slightly displaced with respect to the otherwise straight path of travel of the web 1 so that it slightly overlaps one another, ie the contact surfaces are slightly displaced relative to the otherwise straight path of travel of the web 1.

Due to this displacement of the travel path, the web 1 bends slightly as it passes the contact surfaces 6, 7.

The paint supplied through the outlet openings 12, 13 is sufficient to form a paint retention area 20, 21 between each side of the web 1 and the contact surface 6.7 corresponding to the coating member 2, 3. Supplied at speed.

An excess amount of the paint necessary to form the paint retention portion falls along the frame plates 18, 19 of the coating members 2, 3 due to gravity.

The fluid pressure generated by the excess paint serves to stabilize the rolled material, and when it passes between the rolled material 75 and the coating members 2 and 3, it is floated or suspended between the paint layers, so that the paint is just Acts as a lubricant.

Furthermore, by forming the paint retention portion, it is possible to prevent uneven coating due to the formation of air bubbles in the paint.

The arrangement of the coating members shown in Figure 1 slightly pulls the web material around each contact surface to compensate for unevenness in the straight portion of the contact surface, so coating operations can be performed even if the contact surface is not straight and flat. It will be readily understood that the need for the contact surfaces 6, 7 to be perfectly straight is significantly reduced by the fact that the water does not affect the result.

In FIG. 2, the contact surfaces 6, 7 in the embodiment of FIG.
22 shows another preferred embodiment in which elongated tubular members 22, 23 are substituted.

The tubular members 22゜23 are longer than the entire width of the rolled material 1, and the frame plates 1B-24, 19 define the inner and outer surfaces of the coating member 2゜3.
-25 is pivoted in a container that is substantially fixed.

As is clear from FIG. 3, the frame plates 18 and 24 have brackets 26a and 27a, and a bracket 26a.

The tubular member 22 is pivotally supported by intermediate seals 26 and 27 attached to the inner surfaces of the frame plates 18 and 24 by 27a.

Inside each tubular member 22, 230 is provided an internal distribution chamber 28, 29Ax for accommodating paint, respectively.

Each internal distribution chamber 28, 29 is defined by a hollow, elongated tubular member 38.
, 39, a flexible tubular supply conduit 30 spaced along the length of the tubular members 22, 23 (see, e.g., FIG. 7) into larger chambers 40, 41 defined by connected by.

Each supply conduit 30 is preferably made of a transparent resilient plastics material: preferably the connecting nipple 31 of the tubular member 38, 390 and the connecting nipple 3 of the tubular member 22, 23.
2 are pressure fitted.

The tubular members 22, 23 have elongated groove-like outlet openings 33, 34-1 over their respective lengths! l: Provided,
Its outlet openings 33,34 are directed towards the corresponding surface of the rolled material.

Since the tubular members 22, 23 are preferably pivoted on longitudinal axes 22a, 23a, the position of each outlet opening can be varied up to the position of the groove 33, for example from the solid line position upwards (see FIG. 3). can quickly move an angular distance a or downward an angular distance a.

Furthermore, the tubular members 22.23 are designated by the reference numeral 22a in FIG.
The coating members 2 and 3 are rotated around the rotation axis indicated by 23a.
It can be rotated independently.

The distance X in FIG. 2 represents one preferred vertical displacement between the contact surfaces of the tubular members 22, 230 in the direction of movement of the web 1.

The arrangement shown in FIG. 2 shows, inter alia, that tubular members 22 and 23 are pivoted and are connected by flexible supply conduits 30 to tubular members 38, 3.
9, the advantage is that the tubular members 22, 23 are arranged to be pivotable to some extent independently of each other - I
There are two J.

Ends 38a, 39a of tubular members 38, 39 are rotatably mounted in the seal as shown in FIG.

For example, the end portion 38a has a radius iJ shorter than the tubular member 38 and is surrounded by a seal 50 provided on the side wall 51.

The opposite end 3sb of the tubular member 38 is closed,
It is pivotally supported in an opening 52a in the side wall 52.

If desired, a bearing may be provided between the opening 52a and the tapered portion of the end 38b.

At one end 38a, 39a of the tubular members 38, 39,
53 conduits are connected to a suitable supply of a suitable paint.

If necessary, both ends of the tubular members 22 and 230 are attached to the tubular member 3.
In this way, the rotating force S of the tubular members 22, 23 becomes easier, and the coating process can be easily controlled. Become.

For example, the amount of paint that falls along the outer surface of the inner frame plate 18, 19, the amount of paint that is applied to the material to be wound, and the formation of paint retention areas 20, 21 of appropriate size are determined by It can be provided that each reservoir is formed in direct contact with the gap formed by the contact surface engaging the material 1 and the web material.

Another advantage of the device of FIG. 2 is that the tubular member 22,
23 is easy to manufacture and therefore inexpensive.

Furthermore, the pipe forest members do not have to be completely cylindrical;
It may also be a truncated cylinder with a curved surface that engages the IJ double-wound material 1.

Also, instead of a tubular member, members with other suitably shaped cross-sections may be used.

Furthermore, the outlet opening of the tubular member may have other shapes than a groove as shown in FIG.

For example, the contact surfaces may comprise lips projecting outwardly from the arcuate surfaces 22, 23 and spaced apart from each other to define an exit opening therebetween.

FIG. 4 shows a further embodiment substantially similar to FIG.

In FIG. 4, the outer frame plates 24, 25 have upwardly extending portions 24a, 25a, which are connected to the tubular member 2.
2, 23, thereby substantially sealing the tubular member 22.
．． 23 from falling dust and paint from above.

FIG. 5 shows the upper part of the coating member 2 in detail, and instead of the intermediate seal 26, 270 in FIG. Scrapers 26', 27' and 25'' made of flexible steel are used.

The members 2 and 3 are coated with paint cloth by the scrapers 26' and 2γ.
Prevents intrusion into the interior.

In FIGS. 6 and 7, in order to completely fill the entire length of the paint supply groove 33 provided in the tubular member 22, a partition piece 35 inserted into the groove 33 seals or partially seals the groove 33. It looks like it's been sorted out.

It will be appreciated that a similar divider 35 is also adjustable within the opposite end of the groove 330.

FIG. 7 shows the partition piece 35 inserted into the groove 33 to prevent paint from being applied to the edge M of the rolled material 1.

Obviously, by appropriately adjusting the insertion length of the partition piece 35, the width of the uncoated edge M can be adjusted.

As explained above, the present invention coats both sides of a web material substantially simultaneously by independently adjustable coating members arranged in a zigzag overlapping manner, and coats each side of the web material with paint. By ensuring a uniform distribution of the material and by making the contact surface and the paint feed groove independently adjustable, the web material 75 moves in a novel zigzag pattern between the coated parts and the contact part. It can be understood that the present invention provides a novel method and apparatus for compensating for irregularities in surfaces.

Further, the formation position of the paint retention portion can be appropriately adjusted so that it is located directly in contact with the gap formed between the rolled material and the corresponding contact surface.

Although preferred embodiments of this novel invention have been described, many modifications and improvements can be made by those skilled in the art.

For example, as described above, the coating device can be installed in conjunction with a second scraping station having two opposing flexible blades with the device mounted above the second coating station.

The device provided by the invention can also apply different coatings to each side of the web.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a first embodiment of the coating device according to the present invention, FIG. 2 is a front sectional view of the second embodiment of the coating device according to the present invention, and FIG. FIG. 4 is a front sectional view of a third embodiment of the coating apparatus according to the present invention, and FIG. 5 is an enlarged view showing a part of the coating member in detail. FIG. 6 is a perspective view of a tubular member of the type shown in the embodiments of FIGS. 2 to 5 and using a partition piece, and FIG. 7 is an enlarged view showing the partition piece of FIG. FIG. 8 is an enlarged perspective view of the tubular member and paint supply channel; FIG. 8 is a cross-sectional view of an embodiment of one technique in which the supply chamber of the embodiment of FIGS. 1... Winding material, 2, 3... Coating member, 6, 7...
・Contact surface, 8, 9...Hollow internal chamber, 10, 11...
Supply channel, 12.13... Outlet opening (groove), 14-15
,1617...Lip, 18,19...°Frame plate, 20
, 21... Retention part, 22.23... Tubular member, 24
, 25... Frame plate, 26, 27... Intermediate seal, 26
a, 27a...bracket, 26', 27'...
Scraper, 28°29...Hollow distribution chamber, 30...
Supply conduit, 31, 32... Connection nipple, 33, 34
...Exit opening (groove), 35...Partition piece, 38.39
...Tubular member, 38a. 39a... end, 50... seal, 51.52...
- Side wall, 52a... opening, 53... conduit.

Claims (1)

Claims: 1. A method of substantially simultaneously coating both sides of a continuously fed web of indefinite length, comprising: a) a generally vertically upwardly extending space between a pair of opposing coating members having an exit opening; supplying a web of material; b) forming a gap with respect to opposing surfaces of the web by bringing the outlet opening of the coating member close to the moving web; C) positioned above and overlapping the opposing contact surfaces of the coating members so that the web material moves in a zigzag manner between the coating members, C) through the respective gap areas; A method for simultaneously coating both sides of a web of material, comprising the step of supplying paint at a rate sufficient to form a pool of paint in each of said gaps. 2. An apparatus for substantially simultaneously coating both sides of a continuously fed web of indefinite length, comprising a device for moving the web in an upward vertical direction and an outlet opening located on either side of the moving web. a pair of rigid, opposing coated members, said outlet opening having an elongated groove extending beyond the width of the web material, forming a gap between each port and a respective opposing surface of the web material; The moving rolled material is positioned slightly overlapping each other and is moved along a zigzag path as it passes between the two grooves, supplying paint through each port and retaining excess paint. and a feeding device which forms portions in said gaps to ensure uniform coating of each surface of the web.