JPS6317148B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that the bonding agent from one side is simultaneously pressed in the form of a positionally matched part surface onto a hot melt adhesive applied from the other side, in which case the part The present invention relates to a method for the simultaneous and continuous fixing and lamination of frieze materials using a bonding agent and a hot melt adhesive, such that the faces are each kept at a certain distance from each other.

Such methods are conventionally known. In that case, the binder and hot melt adhesive are applied while the frieze material passes between a pair of embossing or sieve rolls.
The printed images carried on both sides are therefore identical, but this is not intended to achieve the intended use of both materials.

The binder primarily serves to bond the fibers of the frieze material together, thereby providing strength to the frieze material. The more fibers are interconnected, the greater the strength. It is therefore desirable that the binder penetrates into the interior of the frieze material to be treated and, after fixing it, is distributed as uniformly and over the entire surface as possible. As binders, in particular crosslinkable polymeric substances are used in practice.

On the other hand, the hot melt adhesive applied to the surface of the fixing core serves to enable adhesion to other substances. The hot melt adhesives conventionally used are thermoplastics whose activation is carried out by the action of pressure and heat, for example by ironing. Contrary to bonding agents, hotmelt adhesives therefore adhere to each other as completely and in a concentrated manner as possible, even during ironing, without penetrating into the interior of the frieze material used. It is desirable that the adhesive be provided for adhesion between surfaces placed together.

According to the method mentioned at the outset, the binder and hotmelt adhesive can be applied to the upper and lower sides of the frieze material used. However, the condition of the same printing method applied when treating the top and bottom surfaces will result in an equal penetration force and therefore the desired differential penetration of the bonding agent and the hotmelt adhesive. It is extremely difficult to achieve this. It is impossible to mutually correct the size of the applied part surface,
In particular, higher printing speeds result in coarse print images on fiber friezes that have not been prefixed during processing and a concomitant indeterminacy of the properties of the resulting fixation core.

According to JP-A-55-140587 filed by the present applicant, it is shown that the degree of press-fitting from the upper and lower surfaces can be changed by using, for example, a letterpress printing cylinder and a screen printing cylinder. .
However, there are still problems in printing in such a way that the adhesive does not impregnate into the frieze material, while the binder sufficiently impregnates into the frieze material. This is because when printing is performed in this manner, the binder flows out or the applied shape is distorted due to its fluidity, making it impossible to obtain a fully satisfactory result.

From European Patent Application No. 12776, a method is known which makes it possible to effect the immobilization of freeze materials at working speeds of more than 50 m/min by application of a UV-curable binder and subsequent irradiation with a mercury high-pressure lamp. There is no mention of application of hot melt adhesive.

The present invention combines the method described at the outset by simultaneously and sequentially applying a bonding agent and a hotmelt adhesive to the unfixed frieze material in the form of a partial surface having a uniform centerline that coincides with the position. When applying the coating, it is possible to obtain precise printed images on both sides, so that the specific coating weight on both sides and the penetration on both sides can be varied at large working speeds, and the required specific energy input can be reduced. It is based on a mission to further develop the company in this way.

This task is solved by using the features defined in the claims according to the invention. Regarding the advantageous form, it is preferable to carry out the following items.

In the method of the invention, a binder crosslinkable by radiation is pressed from the lower side of the frozen material onto a thermoplastic hotmelt adhesive applied to its upper side according to the hotmelt principle, followed by radiation. Then, crosslinking is performed.

Neither the binder paste nor the hot melt melt contains any wasteful or disadvantageous components that must be removed by a drying process;
The crosslinking of the binder produces an almost rapid effect by utilizing energetic radiation. Since the method proposed here is based on a one-step working scheme, its application is not only problem-free and very easy, but also with a low level of specific energy consumption, e.g. This enables high working speeds of 50 to 150 m/min. In that case,
A significant advantage is that no prefixing of the fiber freeze used is necessary. On the contrary, if this fiber frieze has been made denser in terms of internal structure by the pre-pressing, it is sufficient that the fiber bonds are not destroyed during the printing process. The purpose is to ensure that the length of the stable is at least
This is easily achieved by using a frieze material consisting of 25 mm fibers in an intertwined arrangement.

The printing paste or melt used is applied in partial planes from both sides, and the arrangement is such that its center point lies on a common center line. As far as that is concerned, the arrangement is symmetrical.

The sizes of the partial surfaces may be relatively different from each other and are fixed randomly depending on the desired purpose. In other words, the fixation of the freeze material can optimally take place within itself or together with surface substances by heat fixation. However, such optimization may result in the fabricator having to stock up on specific fixing cores depending on the absorbency and other properties of each specific surface material. , this may clearly remove the benefit again quickly. It has therefore been established that if the bonding agent is applied to the partial surface, it is advantageous if its diameter is at least as large as the diameter of the hotmelt adhesive. If the part surface to which the bonding agent is applied has a larger diameter than the part surface to which the hotmelt adhesive is applied, the penetration reliability of the hotmelt adhesive through the fixing core during ironing is particularly good. The difference between the two is 60 to prevent undesirable hardening of the fixed core.
% or more.

The partial areas are distributed on the fixed core in the form of a planar mesh screen, which can be distributed evenly or unevenly.
This affects the drapeability of the fabric in addition to the stiffening force of the fixing core.

The methods applied to the application of hotmelt adhesives and binders, which in principle belong to different classes, ensure that both substances, which have to fulfill various missions, are brought into favorable mutual synchrony. The result is that it can be applied to both. Furthermore, the two opposingly moving print cylinders exhibit at least flexible and elastic properties;
It is of essential significance that disturbances caused by the resulting printed image are thereby avoided during the printing process, insofar as differences in the thickness and elasticity of the printed frieze material are averaged out.

The binder is applied using a high-, flat-, or deep-print cylinder with a flexible, resilient rubber jacket. In all three cases, the freezing material penetrates well into the interior. Moreover, the high print method
This method reliably prevents contamination of the fiber components that unravel from the surface of the frieze material being printed.
This is combined with the additional benefit of having particularly high surface elasticity.

In the case of high- and flat-printing methods, the amount of binder applied in a particular manner can be varied continuously by adjusting the printing equipment used. When applying deep printing methods, it is necessary to use print rolls that change correspondingly if corresponding changes are required. In the case of high, flat or deep printing methods, it is also necessary to use variable print rolls if the size of the partial area is to be modified.

When using a binder that can be crosslinked by ultraviolet radiation, the binder can be almost spontaneously cured due to the high energy density during crosslinking. The unavoidably consumed surplus energy can reach up to 50% of the total energy used, but insufficient cooling can lead to melting phenomena and therefore sharpening of the thermoplastic hot melt adhesive applied to the top surface. This results in the outline of the image being distorted.

This disadvantage is avoided when using binders that can be crosslinked by electron beams. In this case, no additional heating of the hotmelt adhesive occurs while the crosslinking of the binder takes place, and the thermoplastically melted hotmelt adhesive can be heated at temperatures as low as 60°C, for example. The applied binder naturally cools and hardens naturally, resulting in a printed image with higher precision.

All hotmelt adhesives used in connection are, for example, polyolefin-based, copolyamide-, polyurethane- or copolyester-processed. Melting point is generally 100 to 130
within the range of ℃.

The hotmelt adhesives used are applied in molten form by means of heated cup rolls, which are coated, for example with silicone or PTFE, in order to avoid surface contamination.
Apply coating.

The upper and lower print rolls are connected by a variable speed gear so that the mutual alignment of the application areas of binder and hotmelt adhesive is always uniform. be able to. Because the connections are rigid, they can be positioned relative to each other with great precision. That is, based on such precision, even if the working width is 1 m or more and the diameter of the partial surface is 1 mm or less, the center points of the partial surfaces coated on both sides can be perfectly aligned.

The method of the invention is explained in detail by the enclosed accompanying drawings and the examples described below.

Using several carding machines placed lengthwise,
50% polyester fiber of 1.7dtex/38mm,
Made of 50% 3.3dtex/60mm polyester fiber,
A fiber frieze weighing 25 g/m ² is produced at a speed of 65 m/min. The freeze is passed between a pair of oppositely placed rolls with a linear pressure of 13 Kg/cm, brought to a surface temperature of 165° C., and compacted between the rolls.

Immediately subsequently the running freeze 1 is guided through a printing device which is shown in the accompanying drawing.

The lower print roll 2 is made as a rubber-high print roll. The rubber is stable to organic solvents and has a Shore A hardness of 65. The high print pattern is, in the first case, a row of 17 meshes, and in the second case, a so-called computer point with 52 projections statistically arranged per cm ² . It is provided. To each of these rolls is assigned a specially prepared hotmelt embossing roll with the same distribution.

The diameter of the printed surface of the high print roll is
0.8mm, and the embossing depth is 0.4mm.

From a bath preheated to a temperature of 60°C containing the prepolymer 5, the following binder mixture was applied to a dip roll 4 made of rubber, also heated to a temperature of 60°C, and an embossing of 60 meshes. Through the chrome-plated transfer roll 3, the rubber
Transfer to high print roll 2. The speed of the dip roll 4 is set such that the print coverage of the high print roll on the frieze is 25 g/m ² .

The two print rolls 2 and 6 are arranged in such a way that the center points of the double-applied partial surfaces of binder and hotmelt adhesive coincide absolutely and evenly overlap. The composition of the binder mixture is as follows.

Epoxy acrylate 70 parts Oligotriacrylate 30 parts Benzophenone 2 Benzyl dimethyl ketal 1 N-methyl-diethanolamine 3 Selectively brightener 0.03 As a hot melt adhesive, the melting range is 113
to 116°C, melt index I2/140°C
A copolymerized ester with a rate of 18g/10min is used.
The copolymerized ester is melted in an extruder at a final temperature of 175°C and passed through a heated fishtail die to a similarly heated molten adhesive bath. The temperature of the embossing roll is
The temperature is 170℃.

In both cases, the embossing roll has a cup diameter of 0.55 mm and a cup depth of 0.2 mm.

The cup of the rotating embossing roll is filled to capacity in a hot melt adhesive bath containing molten polymer, which is transferred to the running frieze. At the same time as this progress, High Print Roll 2
From the underside, the binder with a temperature of 60° C. penetrates into the interior of the frieze, thereby causing cooling and hardening of the hot melt adhesive 7 applied to the top side. The application amount of hotmelt adhesive is 14 g per m ² . No further treatment of the molten adhesive is necessary.

After leaving the printing device, Freeze 1 is transported by metal suspenders and passed through an irradiation gate in an irradiation box where two rows of mercury high-pressure lamps with a performance of 200 watts/cm - each above the It is guided in one line and downward in one line. Curing of the binder occurs instantaneously.

Freeze 1 exits the irradiation box through the second irradiation gate and passes through the cooling roll before each
It is cut and rolled into two series with a finished width of 90 cm.

The interlining frieze material produced in this way and fixed by heating is very flexible and has good drapability, as well as very good dry cleaning resistance and excellent washing resistance. . This interlining frieze material can be processed without problems using conventional plate- and continuous presses and has no tendency to peel off the adhesive, even when subjected to the strong action of steam, i.e. hot-melt adhesive on the reinforced core There is no tendency for this to become widespread.

[Brief explanation of the drawing]

1 is a schematic diagram of a printing device used in the present invention. 1...Freeze, 2...Print roll, 3...Transfer roll, 4...Dip roll, 5...Prepolymer,
6...Print roll, 7...Hot melt adhesive.

Claims (1)

[Claims] 1. The bonding agent from one side is simultaneously pressed onto the hot melt adhesive applied from the other side in the form of positionally coincident partial surfaces, each of which is at a certain distance from each other. A method of simultaneous and sequential fixing and lamination of frieze materials using binders and hot melt adhesives such that the
pressing of a binder crosslinkable by irradiation from the underside of the freeze material towards a thermoplastic hotmelt adhesive applied to its upper side according to the hotmelt principle; the pressing of the binder is such that the binder is A process characterized in that it is carried out in such a way as to impregnate the interior of the material and to cool and prevent the hot melt adhesive on the top surface from impregnating, and that the binder is subsequently crosslinked by irradiation. 2. Applying a bonding agent that can be cured by ultraviolet light;
2. A method according to claim 1, characterized in that a mercury air discharge lamp with a power of at least 80 watts/cm is used for crosslinking. 3. Process according to claim 1, characterized in that a binder which can be crosslinked by electron beam is applied and a radiation source with an output of 50 to 500 KeV is used for crosslinking. 4. A method according to any one of claims 1 to 3, characterized in that the bonding agent is applied with a partial area having a larger area than the partial area of the hot melt adhesive. 5. A method according to any one of claims 1 to 4, characterized in that the area is coated in the form of a regular planar mesh screen. 6. A method according to any one of claims 1 to 4, characterized in that the area is coated in the form of a statistical plane mesh screen.