JPS6130067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a treatment method aimed at improving the physical properties, especially printability, of nonwoven fabrics, particularly nonwoven fabrics such as glass wool. The invention also extends to the products obtained by this processing method.

Nonwovens are commonly used as backings for wall coverings, especially floor coverings.

However, the use of asbestos as a backing material for floor coverings is becoming less common, and glass wool is becoming more important, although various materials have been tried in its place.

Normally, nonwoven fabrics made of glass fibers are impregnated with plastisol by a double impregnation method. In this method, in the first impregnation step it is applied to the back side to fill the pores and in the second impregnation step it is applied to the front side to obtain a completely smooth surface without pores, and thus in the subsequent heliographic printing process. This prevents the particles from spreading on the substrate. Generally, this "double impregnation method" is carried out in two consecutive steps. After this "double impregnation method" consisting of a coating process on the front and back sides,
The impregnated fabric is gelled in a heated kettle, often in continuous circulation.

However, this method has the disadvantage that the front and back coatings of the nonwoven are not completely impregnated and often a certain amount of air is trapped. As a result, the trapped air often expands during subsequent heating, creating unevenness on the surface and reducing its commercial value.

Furthermore, the use of a gelling furnace significantly increases the scale of the production line, making the furnace itself relatively long and extremely limiting the production speed.

The present invention has been made in order to solve the drawbacks of the above-mentioned conventional methods.

The present invention provides a method for completely impregnating nonwoven fabrics in a simple and rapid manner.
The gist is that a plastisol with a Newtonian viscosity of 4 to 30 poise is applied to one side of a nonwoven fabric at a temperature of 5 to 50°C, and then the impregnated nonwoven fabric is
The nonwoven fabric is pressed with a pressure roller on a cylinder heated to 130 to 180°C so that the impregnated side of the nonwoven fabric comes into contact with the cylinder and at least partially covers the cylinder.

This impregnated surface becomes the surface on which the final heliographic printing step takes place.

In this way, the following three effects, which cannot be expected from conventional methods, can be obtained in combination. That is, it is possible to completely gel the plastisol without the impregnated cloth sticking to the cylinder, so that an excellent surface finish is achieved, the cloth is completely impregnated, and the back side of the cloth is not attached to the cylinder. It is pre-gelled and dried before leaving.

After cooling, the product obtained is subjected to a heliographic printing process, resulting in a semi-finished product which serves, inter alia, as a base material for the production of floors and other coverings.

The exact processing temperature is selected by considering the speed at which the product passes over the cylinder and the diameter of the cylinder. It is not difficult for a skilled worker to select the processing temperature according to the equipment used. The equipment used will largely determine the speed at which the cloth moves and the diameter of the cylinder that can be used, and a series of steps are taken to determine how to adjust the equipment so that the cloth is fully impregnated but does not stick to the cylinder. An appropriate temperature can be selected by testing.

For example, a cylinder with a diameter of about 2m is 8 to 40m/
If the cloth passes in contact with about 75% of the circumference of the cylinder at a speed of min, the most favorable temperature is
The temperature is on the order of 150℃.

With normal existing equipment, sufficient impregnation cannot be obtained at temperatures below 130°C, and when the upper temperature limit is exceeded, the fluidity becomes excessively large, making it difficult to apply a sufficient amount of plastisol, resulting in subsequent heliographic printing. This results in a surface finish that is unsuitable for the process.

It may be of the type commonly used for plastisol coatings. The above viscosity range, i.e. 4
~30 poise, 6 to 15 poise, especially about 8
Poise is preferred. This viscosity range is easily obtained using commercially available plastisols using conventional diluents or, if necessary, thickening agents.

The flow and deformation behavior of the plastisol used may be substantially Newtonian, but plastisol with somewhat pseudoplastic properties may also be used. However, expanded plastisols should be avoided.

When the raw nonwoven fabric is passed over a heating cylinder, the unimpregnated surface is simultaneously pressed by a pressure roller, preferably a roller lined with an elastic material such as rubber.

Under such processing conditions, a "pad" of plastisol forms upstream of the point of contact between the raw nonwoven fabric and the heating cylinder, with the effect of producing a flat film of plastisol. This results in a favorable surface condition similar to that of calendered films. Furthermore, an effect that cannot be expected with conventional methods is that this plastisol “pad”
without causing a concentration that would make the application impossible.

The method of the invention can be carried out by the method described below with reference to a schematic diagram of a suitable installation.

The accompanying drawings show an installation suitable for impregnating composite backings, for example consisting of substrates laminated with sheets of glass fibers.

The present invention will now be described in detail with reference to the accompanying drawings.

In the figure, 1 indicates a composite backing, which consists of a base material and a sheet of glass fibers, which is conveyed to an applicator roll 3 rotating in a tank containing plastisol 4. The surface formed by the glass fiber sheet is contacted by an applicator roll and the appropriate amount of plastisol is applied.

After application, the applied plastisol film becomes an “air knife” that generates a thin film of air.
6, it is flattened on a return roll 5. Excess plastisol is collected on a plate 7 integral with the tank and returned to the tank.

The composite backing thus impregnated is then transferred to a heating cylinder 10 and passed between a rubber coated pressure roller 12 and the heating cylinder. Conventional equipment is used to ensure a close application of the pressure roller 12 to the cylinder 10 under adjustable pressure. In that case, as mentioned above, the surface of the backing material coated with plastisol is the cylinder 10.
is applied to the cylinder to cover about 75-80% of its circumference, and the cylinder is heated to a temperature of the order of 150°C, for example.

After passing through the cylinder, the backing material can easily separate from the cylinder and is then wound onto a return roll 15 for use in a heliographic printing machine (not shown).
heading to

Plastisol compositions that can be used include those consisting of the following compositions.

PVC 100 Stabilizer 2 Phthalate plasticizer mixture 60-120 Crystalline dolomite 30-200 TiO ₂ 0-15 (preferably 2) Glass sheet, for example, French Patent No. 2295836
As stated in the issue specification (page 1, line 15),
Conventional materials such as glass wool sheets that have been treated to blend in with PVC can be used.

In particular, pretreated "Schüler" on a support of preferably solid or foamed PVC.
ller) or “Ahlstr¨o
m)" type glass sheet can be used.

Examples of the present invention will be described below, but the present invention is not limited thereto.

280g/m ² coated with 60g/m ² glass wool
A plastisol having the following composition was applied at a rate of 500 g/m ² to a composite backing consisting of a PVC base material.

PVC 100 Stabilizer 2 Phthalate plasticizer mixture 90 Crystalline dolomite 35 TiO ₂ 2.5 The plastisol coating process can be carried out using the equipment shown in the attached drawings, but there are also coating rolls, scraper-type coating equipment, reverse rolls, etc. , or similar coating equipment capable of applying the desired amount of coating material can be used.

The backing material impregnated in this way is applied to a gelling cylinder 10 as shown in the accompanying drawings at a rate of 0 to 0 per linear meter.
It is conveyed while passing under a pressure roller 12 that is adjusted to a pressure of 200 kg, preferably 40 kg.

The cylinder roll is heated to 150℃. In such conditions, a support is obtained that can be used for the production of wall or decorative coverings, but the main purpose is for the production of floor coverings. This support is completely free of air entrainment, which causes the drawbacks mentioned above.

The excellent results achieved by the method of the present invention can be attributed to the selection of a substantially Newtonian plastisol. That is, this plastisol is pressurized by the effect of pressure rollers to form a "pad" that remains unconcentrated, i.e. a pad that is continuously renewed during the manufacturing process and substantially adds to the plastisol material used in the manufacturing process. This is because equal amounts of fresh ingredients are being supplied.

This continuous renewal effect of the "pad" prevents gelling of the plastisol pad due to the additive effects of the cylinder.

The use of obviously pseudoplastic plastisols should be avoided, as they do not satisfactorily impregnate the fibers, and expansive plastisols do not allow structuring.
(concentration).

Although the embodiments have been described above, the present invention is not limited to these embodiments, but includes various modifications.

In particular, for example, the treatment method of the present invention can be applied to a single glass fiber sheet or a composite sheet in which a glass fiber sheet is placed on a foamable or non-foamable base material.

Furthermore, the nonwoven fabric of the present invention may be composed of materials with different properties than glass fibers.

[Brief explanation of the drawing]

The accompanying drawings schematically illustrate embodiments of the invention. DESCRIPTION OF SYMBOLS 1... Composite backing material, 3... Application roll, 4... Plastisol, 5... Return roll, 6... Air knife, 7... Board, 10... Heating cylinder, 12...
... Pressure roller, 14 ... Pressure device, 15 ... Return roll.

Claims (1)

[Claims] 1 Plastisol with a Newtonian viscosity of 4 to 30 poise is applied to one side of a nonwoven fabric at a temperature of 5 to 50°C, and the impregnated nonwoven fabric is placed on a cylinder heated to 130 to 180°C using a pressure roller. A method for treating non-woven fabrics, particularly suitable for glass wool, characterized in that the impregnated side of the non-woven fabric is brought into contact with and at least partially covers the cylinder by pressing. 2. The processing method according to claim 1, wherein the impregnated surface is the surface on which a heliographic printing process is performed depending on circumstances. 3. The method according to claim 1, wherein the cylinder is heated to a temperature of the order of 150°C, the moving speed of the nonwoven fabric is set to 8 to 40 m/min, the diameter of the cylinder is set to the order of 2 m, and the nonwoven fabric is brought into contact with 75% of the outer circumference of the cylinder. Processing method. 4. The treatment method according to claim 1, wherein the plastisol has a viscosity of 6 to 15 poise. 5. The treatment method according to claim 1, wherein the viscosity of the plastisol is on the order of 8 poise. 6. The treatment method according to claim 1, wherein the non-woven fabric is passed over a heating cylinder while pressing the non-impregnated side of the non-woven fabric with a pressure roller lined with an elastic material. 7. The treatment method according to claim 1, wherein the nonwoven fabric is a glass sheet. 8. The treatment method according to claim 1, wherein the nonwoven fabric is a glass sheet applied to a foamable or non-foamable substrate. 9. The treatment method according to claim 1, wherein the plastisol is an expandable PVC plastisol.