JPS5991059A - Method of topping pre-printed plane-shaped product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for topping preprinted flat products.

U.S. Pat. No. 4,299,591 discloses that a foamable dye liquor is applied in a second working step to the print surface newly applied to a web-like textile product, and a 7 ohm coating is formed on the dye coating. A method and apparatus for achieving deep penetration into the web is described. If this foam application is carried out in one layer, with the footing doctor limiting the thickness of this layer, the foam is coated with a web-like fiber before the web-like product is placed in a steamer for fixing the dye:
The product disintegrates and causes penetration of the dye. At the end of the coating process, the web-like product is guided through a squeezing device in order to force the foam coating to penetrate into the base of the product.

A disadvantage of this known method is that the foam coating is compacted, in particular by the doctor blade on the one hand and even more intensely by the squeezing device on the other hand. −ξ file products cannot be processed in this way. A particular difficulty is that the foam placed on the product does not collapse directly. Even passing through the coating doctor without any problem, the foam coating contaminates the dye particles which can be eluted from the base, resulting in an indistinct contour. This disadvantage is further amplified: the squeezing device downstream of the applicator causes a turbulent flow between the applied foam and the dissolvable dye particles in the wedge region, resulting in a foam that is penetrating. is not forced into the product directly through the dyed surface, but rather mixes with the dye and reaches behind the selected surface in the direction of product feed. Therefore, it is not possible to obtain a clear printed image by fully using this apparatus. The dye coating runs off to an extent that is completely uncontrolled.

The underlying problem of the invention is to provide an advantageous topping of web-like textile products, which makes it possible to obtain sharp contours and, as a result, homogeneous printed images.

This problem is solved by the features of claim 1.

Therefore, textile materials, advantageously pile products, can be freely painted.
poppies, more specifically by letterpress printing, screen printing, intaglio printing, etc., i.e. by applying an arbitrary, optionally multicolored, pattern to the product, in which case the product is subsequently topped with a foaming medium, and in this case At the same time, it is possible to ensure that the applied foamed dye liquor is at least largely defoamed already within the application area by the collapse of the gas bubbles. Also in this case, the applied dye is not washed away by the foam, and the applied dye is compacted without creating blurred contours, so that the penetration takes place precisely into the product base. It will be done. Therefore, in the present invention, the foamed dye liquor applied directly enters the product and does not shift inward or backward when viewed in the product feeding direction.

Advantageous developments of claim 1 are specified in the dependent claims. In the structure of the device used in claim 2, a high outflow pressure is applied to the applicator in the screen printing machine, so that the aiming direction of the foam applied in the dyeing process is more direct. Directed to the product base.

In general, flat products, preferably web-like products, products with a fibrous structure or web-like products, in particular products such as carpets, velvets, etc.
However, there may also be mentioned fleeces, non-woven absorbent papers and the like.

In general, screen printing methods use rotating stencils because they enable homogeneous coating on long objects; can be done. Also, when using flat stencils, flat products can be treated like floor tiles, for example.

In the following, other features of the invention will be explained in detail with reference to the exemplary embodiments of the drawings.

In FIG. 1, the screen printing machine is represented by 1. Endless rotary printing deck 2 driven by a method known per se
Three printing devices 3, 4 and 5 are arranged under which a web-like product 6 is guided. An arbitrary pattern is applied by the textile printing devices 3 and 4, and topping is performed by the textile printing device 5 using a foaming dye liquid by the coating device 7 and the stencil 5o.

A screen printing machine with a stencil band, such as that represented by the printing device 3, is known from German Patent Specification No. 2 258 892 to Stenni. A printing device with a screen cylinder is known, for example, from German Patent Specification No. 20 26 492. A device for producing foams and applying them to web-like products is already known from German Patent Application No. 25 23 062 fi. This West German Patent Application II already shows and describes a foam manufacturing device for producing dyed foams. So-called static devices are mentioned. Dynamic devices are also already known, for example from the above-mentioned US Pat. No. 4,299,591. Using the device according to FIG. 1, patternwise application to the web-like product 6 can be carried out with optional use of the printing device 3 or 4, and by means of the printing device 5 via the stencil 50: 1) IJ printing Topping of the prepared planar product can be carried out. Therefore, the stencil 50 is not marked with a picture, but the stencils 30 and 40 are marked with a picture on the side (■). Multicolor printing can be carried out. The number of devices .mu. is irrelevant. Depending on the pattern, screen printing machines with up to 12 printing devices which apply liquid or pasty dye onto the product are obtained.Preferably, the last printing station is used for topping. Subsequently, the product enters a steamer for fixation of the dye, which is not shown in the drawings 1 and 2. In FIG. Alternatively, a method is shown in which the web passes under a roller textile printing device operated by an intaglio printing method.A dye supply device 32 is disposed on a textile printing roller 31.The textile printing roller 31 operates in opposition to an opposing pressure roller 33. The shaped products are passed from one machine to the other, with free tension in the gap or on the printing deck 2.
be supported and guided by.

FIG. 3 shows an embodiment in which a rotating screen or stencil 5o is used for topping a pre-printed tile product 6, preferably a web-like carpet product, with a foamable dye liquor. , in which case a rotating screen 50 or a painting stencil is in contact with the tip and is optionally supported at a distance from the base of the product.

The tip 60 of the product is coated with as much dye as possible after passing through the printing equipment in the preceding printing station.
It is preprinted by placing it only on the tip of the ξil. In the drawings, the dye-applied surface is indicated by 34. These coating surfaces enter under the stencil or screen 50 into the range of a coating device formed as a slit doctor, and the foam flowing from the platform feed pipe 70 is passed from the internal space 71 through the slit 77 of the doctor shoe 73. It reaches the product and dissolves the dye particles on the dye-applied surface and penetrates into the product base 61. On one side of the interior space 71 there is arranged a space 72 which serves as a pressure chamber, in which case a pressure pipe 74 operating within a range of approximately 1 mm is connected to a membrane 75 in the illustrated embodiment. - It is placed towards the side.

This pressure is adjustable. The influx of forms is.

This is done via the foam supply pipe 76.

Such a slit doctor is a coating device i ¥7,
This 61 advantageously has a doctor casing which is sealed on all sides, in which the foamable medium is at atmospheric pressure or, as shown, at a pressure 1.degree. higher than atmospheric pressure. The applicator device has a slit-like outlet extending over operation III and directed toward the web-like product or stencil 50 and, together with the screen printing machine, applies the foamable medium to the web-like product. The doctor casing has an internal space 7
An optional supply pipe for the medium connecting to 1 is provided.

The slit doctor is mounted adjustable, in particular height-adjustable, in the doctor holder on the outside of the stencil. A stencil or screen cylinder is also height-adjustably mounted in its side bearings.

A doctor device for applying liquid coating materials, which is pressure-equalized in accordance with the illustrated slit doctor, but of a different construction, is known from DE 23 00 289 A1.

A device for adjusting the height of a stencil, inter alia without a locking device, is known from DE 171 0 523 A1. In this case, there is nothing wrong with providing a corresponding locking device ↑6.

Although in the above one type of screen or stencil is mentioned, screens or stencils of various shapes can be used, such as round stencils, cylindrical stencils, etc., but preferably rotating stencils.

What is important is that the product or web-like product emerges from the stencil and is topped with foam. In this case, the first coating, i.e. the first printing, is performed by a known method.
In letterpress printing, screen printing and intaglio printing, this is carried out optionally depending on the figure to be printed beforehand, and the second printing or this is preferably the last station.

This printing is topped with foam. Due to the small amount of liquid in the foam, topping is possible directly and gives excellent results. In this case, the pre-applied print is carried deeply into the product and is not washed away beyond the edges of the dye-coated surface.

The features of the invention described above that are considered novel with respect to the state of the art can be implemented individually and in combinations thereof.

[Brief explanation of drawings]

1 is a side view showing one embodiment of an apparatus for carrying out the method according to the invention; FIG. 2 is a side view partially showing another embodiment of the apparatus of FIG. 1; FIG. 5 is a cross-sectional view of one embodiment of the screen printing apparatus. 1...Screen printing machine, 2...Rotary printing deck,
3.4.5...Textile printing device, 6...Web-like product, 7
...Coating device, 30...Stencil, 31...Textile printing roller, 32...Dye supply device, 33...Opposed pressure roller, 34...Dye application surface, 40.50...Stencil , 60... Pile tip, 61... Product base,
70...Four 1. Supply pipe, 73...Doctor shoe, 74...Pressure tube, 75...Thin film, 76...
Form supply pipe, 77...slit

Claims (1)

[Scope of Claims] 1. A method for topping preprinted flat textile products, characterized by using a foaming dye liquor. 2 Rotating screen, screen stencil (30)
Using a screen printing machine (1),
The Trapin-j method for pre-printed flat products according to claim 1, characterized in that a foamable dye liquor is applied. 3. The front according to any one of claims 1 and 2, characterized in that the foamable dye solution is applied using a coating device (7) inside a rotating screen or a stencil (30). , a topping method for printed flat products. Inside the rotating screen or stencil (3°),
Claims 1 to 3, characterized in that the foaming dye solution is applied using a slit doctor under atmospheric pressure or under pressure of 100% above atmospheric pressure. Topping method for pre-printed flat products. 5. Rotating screen or screen stencil (3
0) is removed (= J) When using the screen printing machine (1) and considering the foaming dye liquid, the rotating screen or stencil (30) is in contact with the tip of the . Special F characterized by being supported at a distance
A topping method for a pre-printed flat product according to any one of items 2 to 4, in which f' 8rJ is desired.