TWI605880B - Fracture coating method and fracture coater - Google Patents

Description

Crushing coating method and crush coating machine

The present invention relates to a coating method, and more particularly to a crush coating method and a crush coater.

Generally, the wet coating technique applies a coating liquid of a desired thickness to the surface of the substrate, and the coating method can select a suitable method according to the desired thickness and uniformity. The conventional coating method is conventionally known. For example, dip coating, bar coating, doctor blade coating, roller coating, slit die coating, gravure coating, screen printing, flexo printing, and the like. However, the crush coating technique refers to a coating technique in which an incomplete coating is intentionally formed instead of an incomplete coating due to poor coating, and a coating method that may be used, such as a roll coating method or a gravure coating method. , screen printing, flexo printing, but must have a special design to achieve the desired incomplete coating or coating of the desired pattern.

Among them, the roller coating method is generally applied by using a combination of a plurality of rollers, a roller coating machine including a liquid supply tray (or a feed roller) for supplying a coating liquid, and a liquid feeding tray (or a feeding roller). a transfer roll for transferring a coating liquid to a substrate on a transfer roll and a transfer roll for conveying the substrate, for example, a double-coated three-roller coater disclosed in Chinese Laid-Open Patent Publication No. CN203917033, for control The coating film is thick, the complete coating surface is obtained, the coating loss is reduced, the mechanism of the roll coating machine is simple, the roller is easily replaced, and the production cost is reduced.

In view of the above-mentioned background of the invention, in order to meet the requirements of the industry, one of the objects of the present invention is to provide a crush coating method and a crush coater, which utilize an roller coating technique to form an incomplete coating on a porous substrate. The porous substrate has a lotus leaf effect, especially when applied to a cloth, after the processing is completed, the surface layer of the cloth can quickly absorb sweat when it contacts the skin, and the sweat that is absorbed is not returned because of the water-repellent layer with the lotus effect. Diffusion into the skin, reaching A dry, comfortable and fast wicking effect, such as a sweatshirt for high-end women's bras, football suits, etc.

Furthermore, one of the objects of the present invention is to provide a crush coating method and a crush coater, which can form various incomplete patterns by controlling the difference in rotation speed of the rollers to form an incomplete coating on the porous substrate. On the substrate, especially when applied to fabrics, various colored patterns are formed on the surface of the fabric, which is suitable for irregular coloring and decolorization of denim cotton. This method does not have to be dyed like traditional denim, and requires too much water. Dyeing and decolorization can save about 90% of water consumption, which is quite environmentally friendly, and especially the color fastness of the product is better than the traditional method.

In order to achieve the above object, according to an embodiment of the present invention, a crush coating method is disclosed, which uses a roller set to apply a coating liquid to a long strip substrate to obtain a coating method of a crush coating layer. The method includes the steps of: providing a forward coater comprising at least (A) a comma knife coating roll, (B) a transfer roll, and (C) a back roll; and providing The coating liquid is supplied to the (A) comma knife coating roller, and the coating liquid is transferred to the substrate on the (C) back pressure roller via the (B) transfer roller by the rotation of the roller group to form the crush coating layer. The step of (B) the transfer roller and (C) the back pressure roller are respectively driven and controlled by a drive motor, and (B) the rotation direction of the transfer roller is the same as the rotation direction of the (C) back pressure roller, (A) The gap distance between the comma knife coating roller and the (B) transfer roller is G _AB , (B) the gap distance between the transfer roller and the (C) back pressure roller is G _BC , and the difference in the rotational speed of the BC roller is defined by R _BC the rotational speed of the roller (B) transfer and (C) of the counter roll speed ratio ((B) of the transfer roll speed / (C) of the counter roll speed), the control rotation speed difference R _BC 1% to 90% The scope. It is desirable to control the range of the rotational speed difference R _BC from 5% to 90%.

Furthermore, according to another embodiment of the present invention, a crush coater is disclosed which comprises at least (A) a comma coating roll, (B) a transfer roll, and (C) A forward coating machine comprising a back roll, wherein (A) the comma knife coating roller transfers a coating liquid to a long strip on the (C) back pressure roller via the (B) transfer roller The substrate, (B) transfer roller and (C) back pressure roller are respectively driven and controlled by a drive motor, (B) the rotation direction of the transfer roller is the same direction as (C) the rotation direction of the back pressure roller, (A) The gap distance between the knife coating roller and the (B) transfer roller is G _AB , (B) the gap between the transfer roller and the (C) back pressure roller is G _BC , and the difference RB of the _BC roller is defined as (B) When the ratio of the rotation speed of the transfer roller to (C) the rotation speed of the back pressure roller ((B) the rotation speed of the transfer roller / (C) the rotation speed of the back pressure roller), the control rotation speed difference R _BC is 1% to 90%. range. It is desirable to control the range of the rotational speed difference R _BC from 5% to 90%.

In one embodiment, the viscosity of the coating liquid is in the range of 5,000 to 30,000 cps.

In one embodiment, by controlling the magnitude of the G _AB and G _{BC and} the magnitude of the rotational speed difference R _BC , the coating amount of the coating liquid and the permeability of the coating liquid to the substrate are adjusted.

In one embodiment, the crush coater further comprises: a feed roller for unwinding the substrate from the raw material; an expanding and feeding roller disposed between the (C) back pressure roller and the feed roller, To eliminate small creases and transfer the substrate between (B) transfer rolls and (C) back pressure rolls; and a force controller disposed between the feed rolls and the expansion and feed rolls to control the substrate tension.

In one embodiment, the crush coater further comprises: a drying device for drying the coating liquid; and a receiving roller for winding the substrate into a roll shape.

In one embodiment, the elongated substrate is made of a porous material, and may be a plain woven fabric or a knitted fabric.

In one embodiment, (A) the comma knife coating roll is a stationary roll.

In one embodiment, (B) the surface of the transfer roller has a number of recessed holes of more than 3,000 mesh/inch, a recessed depth of less than 0.2 mm, and a surface roughness Ra of less than 0.1 μm.

According to the crush coater of the present invention, an incomplete coating can be formed on the porous substrate by the roller set, and the penetration of the coating liquid on the surface of the porous substrate can be adjusted by controlling the gap and the rotation speed between the rollers. Degree to achieve the effect of forming various patterns on the porous substrate, or to form a water-repellent layer having a lotus effect on the porous substrate.

100,200‧‧‧Crush coating machine

120‧‧‧Drying device

150‧‧‧ receiving device

10‧‧‧feeding roller

20‧‧‧ Exhibition rolls

30,40‧‧‧ Pull roller

50, 60, 70, 80‧‧‧ expansion and feed rolls

A‧‧‧ paint roller (comic knife coating roller)

B‧‧‧Transfer roller

C‧‧‧Back pressure roller

LQ‧‧‧ coating solution

SUB‧‧‧Substrate

G _AB ‧‧‧Gap distance between the coating roller and the transfer roller

G _BC ‧‧·Gap distance between transfer roller and back pressure roller

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a roller set of a crush coating method according to an embodiment of the present invention.

Fig. 2 is a flow chart showing a crush coating method according to an embodiment of the present invention.

Fig. 3 is a schematic view showing a part of a roller of a crush coater according to an embodiment of the present invention.

Fig. 4 is a side view showing a crush coater according to an embodiment of the present invention.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only reference additions The direction of the schema. Therefore, the directional terminology used is for the purpose of illustration and not limitation. In addition, the term "A layer (or component) is disposed on the B layer (or component)" is not limited to the aspect in which the A layer directly contacts the surface of the B layer, for example, the layer A and the layer B are spaced apart from each other. The layer is also covered by the term. In the drawings, the same elements are denoted by the same symbols.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a roller set of a crush coater according to an embodiment of the present invention. The roller set of the crush coater shown in Fig. 1 includes (A) a coating roll, (B) a transfer roll, and (C) a back roll, which can constitute a forward coating of the present invention. Cloth machine. (A) The comma knife coating roller transfers the coating liquid to the substrate on the (C) back pressure roller via the (B) transfer roller, (B) the transfer roller and (C) the back pressure roller are respectively driven by a drive motor (2) The motor is not shown) drive and control, (B) the direction of rotation of the transfer roller is opposite to the direction of rotation of (C) the back pressure roller (B) the tangential direction of the contact between the transfer roller and the (C) back pressure roller is In the same direction (as shown in Figure 1, when the (B) transfer roll is in contact with the (C) back pressure roll, the substrate (B) transfer roll and (C) back pressure roll are sandwiched between the substrate and/or coated. Where the liquid is in contact.), (A) the distance between the comma knife coating roller and the (B) transfer roller is G _AB , and the distance between the (B) transfer roller and the (C) back pressure roller is G _BC , BC roller rotation speed difference R _{BC is} defined as (B) the ratio of the rotation speed of the transfer roller to (C) the rotation speed of the back pressure roller ((B) the rotation speed of the transfer roller / (C) the rotation speed of the back pressure roller) The control rotational speed difference R _BC is in the range of 1% to 90%. (A) The coating roller is preferably a comma coating roll. It is desirable to control the range of the rotational speed difference R _BC from 5% to 90%.

Further, according to the crush coating method of the present invention, a coating method of applying a coating liquid LQ to a long strip substrate SUB using the above roller group (including A, B and C rolls) to obtain a crush coating layer . Fig. 2 is a flow chart showing a crush coating method according to an embodiment of the present invention. In the figure, LQ indicates a coating liquid, SUB indicates a substrate, and a direction indicated by a hollow arrow indicates a direction in which the coating liquid moves.

Further, in the crush coater of the present invention, a device for feeding rolls, expansion and feed rolls, tension controllers, drying devices, and the like may be further included in practical applications in order to meet the needs of different application uses. Fig. 3 is a schematic view showing a part of a roller of the crush coater 100 according to an embodiment of the present invention. Fig. 4 is a side view showing a crush coater 200 according to an embodiment of the present invention. 3 and FIG. 4, wherein the same components are denoted by the same reference numerals, and the crush coater 200 includes the roller set of the crush coater 100 shown in FIG. Material device 150. The crush coater 100 shown in Fig. 3 includes at least a feed roll 10, a spread roll 20, a pulling roll 30, 40, an expanding and feeding roll 50, 60, 70, 80 and (A) a comma knife coating roll, ( B) A roller set consisting of a transfer roll and (C) a back pressure roll. The comma knife coating roller A, the transfer roller B and the back pressure roller C shown in Fig. 3, the diameter of the roller is made according to the need, and the difference in the size of the rollers 10~80 and A~C on the drawing is only different. Rollers are not limited in their relative size. Among them, a tension controller (not shown) may be disposed between the expansion and feed rolls 50, 60, 70, 80. The receiving device 150 can be constructed by winding a substrate into a roll or a drum using a conventional receiving device or a winding device.

The substrate to be applied to the crush coating method and the crush coater of the present invention is composed of a porous material, and may be a plain woven fabric or a knitted fabric. When the substrate is a porous material, the permeability of the coating liquid to the substrate affects the effect of the formed coating. In the case of using a woven fabric as a substrate, in order to eliminate small creases and flatten the substrate, the crush coater of the present invention comprises a tension controller and an expansion and feed roller, and in addition, a plurality of tension control can be provided at a plurality of places. In order to control the tension of the substrate before and after coating and the tension of the substrate before and after drying.

Furthermore, in addition to the pore condition of the substrate, the viscosity of the coating liquid also affects the permeability to the substrate. According to the coating method of the present invention, the viscosity of the coating liquid is controlled so that the coating liquid does not penetrate the substrate. On the other hand, when the coating liquid is applied to the surface of the substrate, the viscosity of the coating liquid is controlled so that the penetration depth of the coating liquid is smaller than the thickness of the substrate. The viscosity of the coating liquid is usually in the range of 500 to 40,000 cps, more preferably in the range of 5,000 to 30,000 cps, and more preferably in the range of 15,000 to 25,000 cps. When the viscosity of the coating liquid is too low, the diffusion is too fast to transfer from the coating roller to the substrate to form a desired fracture coating. Further, the solid content concentration of the coating liquid may be in the range of 0.5 to 50% by weight, and when the hot melt adhesive is used, the solid content concentration may be 100% by weight.

As shown in Fig. 1, by controlling the magnitude of the G _AB and G _{BC and} the magnitude of the rotational speed difference R _BC , the coating amount of the coating liquid and the permeability of the coating liquid to the substrate can be adjusted. The driving transfer roller B and the back pressure roller C are independent motors, so that the rotational speeds of the transfer roller B and the back pressure roller C can be separately controlled, that is, the rotational speed difference R _BC can be controlled. Specifically, although the coating amount of the coating liquid and the permeability of the coating liquid to the substrate vary depending on the viscosity of the coating liquid, generally, for example, the gap distance G _{AB of the} coating blade is large, and the coating amount is large, and the coating layer is applied. thicker; coating gap; gap coating knife a small distance G _AB, a small amount of coating, thickness of the coating layer is thin; coated small gap distance G _BC, large liquid permeability of the coating to the substrate The distance from the G _{BC is} large, and the penetration of the coating liquid to the substrate is small. However, the thickness and permeability of the coating layer composed of the coating liquid are also related to the magnitude of the rotational speed difference R _BC .

In order to form an incomplete coating on the porous substrate, to impart a lotus effect to the porous substrate, or to form an incomplete coating on the porous substrate, various patterns can be formed on the substrate, that is, by According to the structure and operating conditions of the crush coater of the present invention, the crushed coating can be formed to achieve the above object.

A drying device for drying the coating liquid. The comma knife coating roller A can be a stationary roller. The surface of the transfer roller B may have a number of recessed holes of more than 3,000 mesh/inch, a recessed depth of less than 0.2 mm, and a surface roughness Ra of less than 0.1 μm.

The invention will now be described in more detail by way of examples.

Example 1:

A knitted fabric having a thickness of 0.35 mm was used as a substrate. The coating liquid 1 (viscosity was about 20,000 cps) was prepared by mixing 3% by weight of a water repellent (C6), 1.75 wt% of a thickener (ST2078), 3% by weight of a crosslinking agent (FBI), and water. Using the crush coater shown in Fig. 1 above, the coating liquid 1 is poured onto the coating roll A, the coating liquid 1 is transferred to the transfer roll B, transferred from the transfer roll B to the back pressure roll C, and finally applied to the substrate. on. The rotation speed of the back pressure roller C was 5 m/min, and the rotation speed of the transfer roller B was set to 39.2% (R _BC = 39.2%) of the back pressure roller C. The oven temperature was set to 160 ° C and the wind speed was set to 1350 rpm. The knife gap (G _AB ) was set to 0.07 mm, the cloth gap (G _BC ) was set to 0.39 mm, and the cloth gap was set to the thickness of the cloth + 0.04 mm. The tension control was set to about 3 kg/cm ² .

By using a dropper to drip water to about 0.5 ml of water on the test object (coated substrate), if the water can be absorbed after staying on the test object for more than 5 seconds, it is judged to have a lotus effect.

Example 2:

The knitted fabric was applied in the same manner as in Example 1 except that the number of revolutions of the transfer roller B was set to 49.0% (R _BC = 49.0%) of the back pressure roller C.

Example 3:

The knitted fabric was coated in the same manner as in Example 1 except that the rotation speed of the transfer roller B was set to 58.8% (R _BC = 58.8%) of the back pressure roller C.

Example 4:

A plain woven fabric having a thickness of 0.56 mm was used as a substrate. The mixed color paste (blue dye) was 2% by weight, the polyurethane (PU) was 2% by weight, the crosslinking agent was 0.5% by weight, the thickener was 1.2% by weight, and water, and the coating liquid 2 (viscosity was about 15,000 cps) was prepared. Using the crush coater shown in Fig. 1 above, the coating liquid 2 is poured onto the coating roll A, the coating liquid 2 is transferred to the transfer roll B, transferred from the transfer roll B to the back pressure roll C, and finally applied to the substrate. on. The rotation speed of the back pressure roller C was 5 m/min, and the rotation speed of the transfer roller B was set to 10.0% (R _BC = 10.0%) of the back pressure roller C. The oven temperature was set to 135 ° C and the wind speed was set to 1350 rpm. The knife gap (G _AB ) was set to 0.07 mm, the cloth gap (G _BC ) was set to 0.60 mm, and the cloth gap was set to the thickness of the cloth + 0.04 mm. The tension control was set to about 3 kg/cm ² .

Example 5:

A nylon having a thickness of 0.66 mm was used as the substrate. 10% by weight of a water-repellent agent (EP5954), 1.75 wt% of a thickener (ST2078), 3 wt% of a crosslinking agent (FBI), and water, and a coating liquid 3 (viscosity of about 23,000 cps) was prepared. Using the crush coater shown in Fig. 1 above, the coating liquid 3 is poured onto the coating roll A, the coating liquid 3 is transferred to the transfer roll B, transferred from the transfer roll B to the back pressure roll C, and finally applied to the substrate. on. The rotation speed of the back pressure roller C was 5 m/min, and the rotation speed of the transfer roller B was set to 20.2% (R _BC = 20.2%) of the back pressure roller C. The oven temperature was set to 160 ° C and the wind speed was set to 1350 rpm. The knife gap (G _AB ) is set to 0.07 mm, the cloth gap (G _BC ) is set to 0.70 mm, and the cloth gap is set to the thickness of the cloth + 0.04 mm. The tension control was set to about 3 kg/cm ² .

According to the crush coating method and the crush coater of the present invention, an incomplete coating layer can be formed on the porous substrate by the roller group, and the coating liquid can be adjusted on the porous base by controlling the gap and the rotation speed between the rollers. The permeability of the surface of the material to achieve the effect of forming various patterns on the porous substrate, or the effect of forming a water-repellent layer having a lotus effect on the porous substrate.

The present invention has been described in detail with reference to the preferred embodiments of the present invention, and the scope of the invention is not limited thereto, and it is understood that various modifications and changes can be made without departing from the spirit and scope of the invention. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

A‧‧‧ paint roller (comic knife coating roller)

B‧‧‧Transfer roller

C‧‧‧Back pressure roller

G _AB ‧‧‧Gap distance between the coating roller and the transfer roller

G _BC ‧‧·Gap distance between transfer roller and back pressure roller

Claims (14)

A crush coating method is a coating method for applying a coating liquid to a long strip substrate by using a roller group to obtain a crush coating layer, comprising the steps of: providing at least (A) a coating roller, (B) a step of a transfer coater formed by the transfer roll and (C) a back roll of the roll group; and providing the coating liquid to the (A) coating roll by the roller set Rotating, the coating liquid is transferred to the substrate on the (C) back pressure roller via the (B) transfer roller to form the crush coating layer; wherein (B) the transfer roller and (C) the back pressure roller are respectively driven Motor drive and control, (B) the direction of rotation of the transfer roller is opposite to the direction of rotation of (C) the back pressure roller and (B) the tangential direction of the transfer roller and (C) the back pressure roller are in the same direction, (A The gap distance between the coating roller and the (B) transfer roller is G _AB , (B) the gap between the transfer roller and the (C) back pressure roller is G _BC , and the difference between the rotational speeds of the BC rollers R _{BC is} defined as ( B) When the ratio of the rotation speed of the transfer roller to (C) the rotation speed of the back pressure roller ((B) the rotation speed of the transfer roller / (C) the rotation speed of the back pressure roller), the control rotation speed difference R _BC is in the range of 1% to 90%. Where the broken coating is not finished a uniform and irregular layer; (B) the surface of the transfer roller having a number of recessed holes of more than 3,000 mesh/inch, a recessed depth of less than 0.2 mm, and a surface roughness Ra of less than 0.1 μm. The crush coating method according to claim 1, wherein the viscosity of the coating liquid is in the range of 5,000 to 30,000 cps. The crush coating method according to claim 1, wherein the coating amount of the coating liquid and the coating liquid to the substrate are adjusted by controlling the size of the G _AB and G _{BC and} the magnitude of the rotation speed difference R _BC . Permeability. The crush coating method according to claim 1, wherein the elongated substrate is composed of a porous material. The crush coating method according to claim 1, wherein the substrate is a plain woven fabric or a knitted fabric. The crush coating method according to claim 1, wherein the (B) transfer roller and the (C) back pressure roller are respectively driven and controlled by a drive motor, and (A) the paint roller is a stationary comma knife coating roller. . A crush coater comprising at least (A) a comma coating roll, (B) a transfer roll, and (C) a back roll, and a forward coater. Wherein (A) the coating roller transfers a coating liquid to the long substrate of (C) the back pressure roller via the (B) transfer roller, (B) the transfer roller and (C) the back pressure roller are respectively driven by a drive motor Drive and control, (B) the direction of rotation of the transfer roller is opposite to the direction of rotation of (C) the back pressure roller and (B) the tangential direction of the transfer roller at the contact of the (C) back pressure roller is the same direction, (A) The gap distance between the coating roller and the (B) transfer roller is G _AB , (B) the gap between the transfer roller and the (C) back pressure roller is G _BC , and the difference between the rotational speeds of the BC rollers R _{BC is} defined as (B) When the ratio of the rotation speed of the transfer roller to (C) the rotation speed of the back pressure roller ((B) the rotation speed of the transfer roller / (C) the rotation speed of the back pressure roller), the control rotation speed difference R _BC is in the range of 1% to 90%; Wherein (B) the surface of the transfer roll has a number of recessed holes of more than 3,000 mesh/inch, a depth of the recessed holes of less than 0.2 mm, and a surface roughness Ra of less than 0.1 μm. The crush coater of claim 7, wherein the coating amount of the coating liquid and the coating liquid are applied to the substrate by controlling the size of the G _AB and G _{BC and} the magnitude of the rotation speed difference R _BC . Permeability. The crush coater of claim 7, wherein the crush coater further comprises: a feed roll for unwinding the substrate from the raw material; and an expansion and feed roll disposed at (C) a back pressure roller and the feed roller for eliminating small creases and transferring the substrate between the (B) transfer roller and the (C) back pressure roller; and a force controller disposed on the feed roller and extending And between the feed rolls, control the tension of the substrate. The crush coater of claim 9, wherein the crush coater further comprises: a drying device for drying the coating liquid; and a receiving roller for winding the substrate into a roll shape . The crush coater of claim 7, wherein the elongated substrate is composed of a porous material. The crush coater of claim 7, wherein the substrate is a plain woven fabric or a knitted fabric. The crush coater of claim 7, wherein the (A) paint roll is a stationary comma knife paint roll. The crush coater of claim 7, wherein the viscosity of the coating liquid is in the range of 5,000 to 30,000 cps.