KR100386161B1 - Apparatus of coating web substrate - Google Patents

Abstract

The present invention relates to an apparatus for coating a web substrate. The apparatus according to the invention comprises first and second coating stations disposed between an unwinder and a rewinder, and a plurality of idle rollers. The first and second coating stations each have an extruder having a die disposed above the nip roll assembly. A turn bar mechanism is disposed between the first and second coating stations, and the turn bar mechanism includes a direction change roll disposed up and down in an intersecting relationship with each other, and a guide roll disposed on the side of the direction change roll. . The web substrate may selectively pass through the turnbar mechanism when fed from the unwinder to the rewinder. It is preferred that an adhesive applicator is provided between the unwinder and the first coating station for applying the adhesive to the web substrate.

Description

Apparatus for coating a web substrate {APPARATUS OF COATING WEB SUBSTRATE}

The present invention relates to an apparatus for selectively coating web substrates such as paper, textiles with polyethylene.

Apparatuses for coating paper substrates include general packaging, envelope articles, release paper substrates, adhesive tape stock, transfer paper, liquid beverage containers such as milk cartons, cup containers, seasoning containers, can containers, insulating sheets, reflective sheets, embossing Background of the Invention A wide range of applications and markets, such as sheets, automotive interior surfaces, and carpet substrates, have been developed in the background.

Such techniques of coating web substrates are generally only capable of any one surface treatment. Therefore, in the case where a double-sided coating is desired, after the surface treatment of one surface of the web substrate, the web substrate has to be recovered and the above process is performed again. Thus, the double sided coating operation is at least twice as long as the single sided coating operation time and cost.

In order to solve this problem, an apparatus has been developed which can perform double-side coating of web substrates continuously in a single working process.

1 is a schematic illustration of a conventional apparatus capable of double-coating a web substrate.

The conventional device shown is an unwinder 1, a rewinder 2, first and second coating stations 3a, 3b disposed between the unwinder and the rewinder, and a plurality of idle rollers ( 5, 6). The first and second coating stations 3a, 3b each have extruders 7a, 7b with dies 16a, 16b disposed above the nip roll assembly.

According to the above structure, the web base material 13 supplied from the unwinder 1 passes between the nip roll 11a and the cooling roll 10a. At this time, polyethylene is apply | coated to the predetermined surface of a web base material from the die 16a of the extruder 7a arrange | positioned upwards.

Here, in the case of coating one surface of the web substrate, the web substrate 13 released from the unwinder 1 is directly supplied to the second coating station 3b via the idle rollers 5 and 9 (2 See web description shown in dashed and dashed lines). The web substrate is applied to one surface of polyethylene supplied from the die 16b of the extruder 7b while passing between the nip roll 11b and the cooling roll 10b of the second coating station 3b. A web substrate coated with polyethylene on one surface is wound on the rewinder 2.

And when coating both surfaces of a web base material, the web base material 13 unwound from the unwinder 1 is supplied to the 1st coating station 3a via the idle roller 6. Here, the web substrate is applied to one surface of polyethylene supplied from the die 16b of the extruder 7a while passing between the nip roll 11a and the cooling roll 10b of the first coating station 3a. Thereafter, the web substrate is supplied to the second coating station 3b described above. At this time, the web substrate is fed above the first coating station 3a to the second coating station 3b so that the coating surface of the web substrate is oriented downward. Thus, the coated surface at the first coating station is directed in the opposite direction to the extruder when fed to the second coating station. The web substrate coated at the second coating station 3b is wound on the rewinder 2.

According to the conventional apparatus described above, for the double-sided coating of the web substrate, the web substrate discharged from the first coating station is automatically turned over while being fed to the second coating station. However, the above-described apparatus has a problem in that the surface of the web substrate cannot be repeatedly coated two or more times. Therefore, in the conventional apparatus, in the case where the surface of the web substrate is to be repeatedly coated, the web substrate should be coated in the same manner after coating one side.

In addition, because the web substrate exiting the first coating station moves upwards the coated surface, the conventional apparatus must include a housing that encloses the entire first coating station in mechanical construction. This provides a problem in that the housing must be dismantled every time the cooling roll or the like is replaced according to the type of work.

In addition, when manufacturing release paper etc., a web base material may be laminated | stacked with a special film on the surface to be coated. For this purpose, a separate unwinder for film should be installed near the coating station. However, in the conventional apparatus, since the first coating station is surrounded by the housing, no separate space can be provided. Thus, the unwinder for the film can only be installed in the second coating station. Therefore, in the case of double-coating the web substrate, the lamination is possible only at the second coating station, and lamination is impossible on the coating surface on the opposite side.

Accordingly, it is an object of the present invention to solve the above-mentioned problems of the prior art, and in particular, to provide a web-based coating apparatus capable of treating two-sided, double-sided, and one-sided coatings of a web substrate in a single process.

Another object of the present invention is to provide an apparatus which is easy to repair and replace a cooling roll and a nip roll.

It is yet another object of the present invention to provide an apparatus capable of minimizing the loss rate of the web substrate.

1 is a diagram schematically illustrating an apparatus for coating a conventional web substrate.

2 is a diagram schematically showing an apparatus according to the invention.

3 is a perspective view schematically showing the turnbar mechanism of FIG. 2.

4 is a perspective view showing another embodiment of a turnbar mechanism.

FIG. 5 is a perspective view schematically showing the non-contact roll of FIG. 2.

<Explanation of symbols for the main parts of the drawings>

1: unwinder

2: rewinder

3a, 3b: coating station

5, 9: idle roller

7a, 7b: extruder

10a, 10b: cooling roll

11a, 11b: nip roll

50: Turn Bar Mechanism

60: dry laminate treatment unit

72: drying chamber

In order to achieve the above and other objects of the present invention, according to one embodiment of the present invention, the first and second coating stations disposed between the unwinder and the rewinder, and a plurality of idle rollers, And a second coating station, each having an extruder having a die disposed adjacent adjacent the nip roll assembly. A turn bar mechanism is disposed between the first and second coating stations, and the turn bar mechanism includes a direction change roll disposed up and down in an intersecting relationship with each other, and a guide roll disposed on the side of the direction change roll. . The web substrate may selectively pass through the turnbar mechanism when fed from the unwinder to the rewinder.

It is preferred that an adhesive applicator is provided between the unwinder and the first coating station for applying the adhesive to the web substrate. The adhesive applicator comprises: an adhesive reservoir, an adhesive application roll at least partially immersed in the adhesive reservoir, a pressure roll in contact with and being constantly pressed against the adhesive application roll, a plurality of rolls guiding the web substrate, and a complete enclose of the roll A drying chamber disposed along this is inexpensive.

2 and 3, an apparatus according to an embodiment of the present invention will be described in more detail.

The apparatus according to the invention comprises first and second coating stations 13a, 13b and a plurality of idle rollers 5 arranged between an unwinder and a rewinder, not shown. The first and second coating stations 13a, 13b have extruders 7a, 7b, respectively, with dies 16a, 16b disposed above the nip roll assembly.

The apparatus according to the invention also comprises a dry laminate treatment unit 60 which can pre-apply an oily and aqueous adhesive to the web substrate between the unwinder and the first coating station 13a. The dry laminating treatment unit guides the web substrate to the adhesive reservoir 70, the adhesive coating roll 22 in which at least a part of the adhesive reservoir is immersed, the pressure roll 20 which is in contact with the adhesive coating roll and is always pressed toward it. A plurality of rolls 5 and drying chambers 72 arranged along them to completely enclose the rolls.

In addition, film supply unwinders 40a and 40b for supplying a special film are provided in adjacent portions of the first and second coating stations 13a and 13b, respectively.

In the structure described above, the greatest feature of the device according to the invention is that a turnbar mechanism 50 is provided between the first coating station 13a and the second coating station 13b (see FIG. 3).

Figure 3 is a perspective view schematically showing a turn bar mechanism 50 according to the present invention, the turn bar mechanism 50 is a direction switching rolls 56, 58 arranged up and down in a relationship intersecting with each other, and the direction The guide rolls 52 and 54 arrange | positioned at the switching roll side, respectively are provided. Each of the direction change rolls 56, 58 is arranged at an angle of about 35 to 55 degrees, preferably about 45 degrees, with respect to the web substrate to be entered.

The turnbar mechanism 50 shown in FIG. 3 is configured such that the direction of the web substrate to be discharged coincides with the direction of the web substrate to be entered. However, turnbar mechanism 150 configured as shown in FIG. 4 may be used. The turnbar mechanism 150 shown in FIG. 4 has one direction change roll 156 disposed obliquely at an angle of about 45 degrees. This turn bar mechanism 150 is suitable for a place where space is narrow.

According to the structure described above, the web substrate supplied from the unwinder passes through the dry lamination treatment unit 60 while an adhesive is applied to the surface in contact with the application roll 22. The web substrate to which the adhesive is applied is dried while moving inside the drying chamber 72 along the idle roll 5. To this end, hot air is preferably supplied into the drying chamber.

When the web substrate is discharged from the dry lamination processing portion 60, the surface to which the adhesive is applied moves without contacting the idle roller 5. However, the part discharged from the dry lamination processing part 60 comes into contact with the roll or roller on the surface to which the adhesive of the web base is applied. If the coated surface comes into contact with the roll or roller, there is a problem that the web substrate adheres to the roll or roller by the adhesive.

In order to prevent this, referring to FIG. 5, it is preferable that the last roller 74 of the dry lamination treatment part 60 is made of a hollow cylindrical body in which a plurality of fine holes are perforated over the entire outer circumferential surface thereof. When air is continuously injected through the shaft of the roller 74, the air is discharged to the outside through a hole formed in the outer peripheral surface. At this time, a small gap is formed between the outer circumferential surface of the roller 74 and the web base material in contact with this by the discharged air. Therefore, even if the adhesive-coated side of the web base material faces the circumferential surface of the roller, air gaps are generated between the web base material and the rollers, so that the web base material is prevented from adhering to the roller.

The web substrate discharged from the dry lamination processing unit 72 by turning the roller 74 passes through the nip roll 11a and the cooling roll 10a while being supplied to the first coating station 13a. At this time, polyethylene is apply | coated to the predetermined surface of a web base material from the die 16a of the extruder 7a arrange | positioned upwards.

The web substrate discharged from the cooling roll 10 is discharged from the cooling roll 10 with the coated surface facing upward. Thus, in order to coat the other surface of the web, the web substrate is fed to the turnbar mechanism 50 while being redirected so that the coated surface faces from top to bottom.

In this case, when the coated surface is to be repeatedly coated, it may be supplied directly to the second coating station 13b without passing through the turn bar mechanism 50 (see the web description shown by the dashed-dotted line).

The web substrate discharged from the first coating station 13a passes through between the nip roll 11b and the cooling roll 10b of the second coating station 13b and is supplied with polyethylene supplied from the die 16b of the extruder 7b. Is applied.

At this time, when the coating surface of the web base material is to be covered with a special film, it is supplied to each of the cooling rolls 10 and 10b from the special winder rewinders 40a and 40b.

Hereinafter, the results of operating the conventional apparatus shown in FIG. 1 and the apparatus according to the present invention shown in FIG. 2 are as follows.

In the case of double-side coating of 50,000 m paper first, the conventional method took about 24 hours, and the present invention took about 10 hours.

The paper loss generated when producing 50,000 m of paper was 2,500 m in the conventional apparatus, and 900 m in the present invention.

According to the above-described structure, the web substrate coating can be subjected to two single-sided, double-sided, or single-sided treatments in a single process.

And since the loss rate of the web substrate can be reduced to less than about 2%, the cost is saved.

In addition, the composite material production is possible because the web substrate and the special film can be laminated at each of the first and second coating stations.

Claims (6)

A first and second coating station disposed between the unwinder and the rewinder and a plurality of idle rollers, each of which has an extruder having a die disposed above the nip roll assembly; In the apparatus for coating a web substrate, A turnbar mechanism is disposed between the first and second coating stations, The turn bar mechanism includes one or more direction change rolls arranged at an angle at an angle of about 35 to 55 degrees with respect to the web substrate to be entered, and guide rolls disposed on each side of the direction change rolls, An adhesive applicator is provided between the unwinder and the first coating station to apply an adhesive to the web substrate so that the web substrate can be overlaid with a predetermined film, The adhesive applicator may include an adhesive reservoir, an adhesive coating roll at least partially immersed in the adhesive reservoir, a pressure roll that is constantly pressed toward the adhesive coating roll, a plurality of rolls for guiding the web substrate, and the roll to completely surround the roll. And a drying chamber disposed along the web substrate. delete delete 2. The apparatus of claim 1, wherein a non-contact guide roll configured to guide the web substrate in a non-contact state with the application surface of the web substrate is installed on the discharge side of the drying chamber. 5. The apparatus of claim 4, wherein the non-contact guide roll is made of a hollow cylindrical body, the outer circumferential surface of which a plurality of fine holes are perforated. An apparatus for coating a web substrate according to claim 1, wherein a film supply unwinder is provided at an adjacent portion of each of the first and second coating stations to supply a film laminated with the web substrate.