JPH02139060A - Application of molten material or liquid and its device - Google Patents

Abstract

PURPOSE:To prevent an air block generated in a recessed part by discharging a molten material to the surface of a roll from a nozzle and filling the recessed part of a pattern sequentially starting with a part of the recessed part with a discharge pressure. CONSTITUTION:A molten material is discharged from a nozzle 3 to the surface of a roll 1 with a recessed part at right angles or close to right angles. The molten material M discharged from the nozzle 3 is injected into the recessed part 1C from its one side at a discharge pressure. At the same time, the molten material M gradually expands its penetrating area while expelling the air Ar from the recessed part through the other side of said part. In this way, the molten material occupies the entire recessed part up to every corner and therefore, does not change the profile and thickness of the pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and apparatus for applying a melt or liquid using a row-jet roller having recesses or the like.

[Conventional Techniques] The conventional method of applying a molten material using a roll having a certain pattern of concave portions is to immerse the lower part of a horizontally installed and rotating roll in the molten material. It was something. An example of this is shown in Figure 17, which shows the application method using hot melt adhesive (hereinafter referred to as hot melt). , into a pan 84, and while the force E is maintained at a constant level, a roll 81 having a recessed portion of a certain number of turns (hereinafter abbreviated as a recessed roll) 81 is rotated in the Rs' direction. . The melt M has adhered to the inside of the recesses of the recessed roll and the surface (flat surface) of the recessed roll 8H± due to the immersion of the lower 11 parts of the recessed roll, and the melt M7 is rotated. The molten material M, c in a certain pattern inside the recesses is transferred and coated onto the surface of the object to be coated W1 using a doctor.

[Problem to be Solved] However, the above-mentioned conventional method has one major drawback, which will be explained in the following. Referring to FIGS. 1x to 26, first, the recessed roll 81 enters the melt M7 from the atmosphere by breaking through the surfaces M and f of the melt M7 while rotating once. At this time, air A'' on the surfaces M, f' (Figure 19) of the molten body M is drawn into the recess 81C (Figure 18), which was empty in the atmosphere Ar (Figure 19).
Art), and is trapped in the upper corner of the recess 81C (Ar3).The recessed roll 81 continues to rotate (Fig. 20), passes through the melt M7 and emerges on its surface. Then, the molten material M is deposited in a cloth-like manner on the surface of the recessed roll 81 and rotated upward (FIG. 21). At this time, the trapped air Ar3 moves downward in the recessed area due to its buoyancy. Move from the corner to the upper corner (Ar, →Ar, →Ar: Fig. 21).

Next, the doctor blade 85 scrapes off the melt adhering to the flat surface of the recessed roll 81, leaving only the melt M Hcl in the recesses. At this time, the surface of the molten material in the recess is recessed (
M s cf ) (Figure 22). That is, the recess 81
The molten material in C was squeezed by air from both sides of the bottom and surface. And the edges look like they have been torn apart (M, c When external pressure is further applied and crimped (M@c3? Fig. 25), the thin part becomes torn into pieces (as seen in Fig. 26 when viewed from the "Y" direction).
M, e1). As can be seen in Figures 25 and 26 above, if only a part of the applied material is adhered, the adhesive strength will of course be weaker, and the thickness of the applied material will vary. Especially when the molten material is ink, the appearance of the color becomes darker and lighter, and the so-called color tone changes.

In particular, the smaller the area of the recess and/or the higher the viscosity of the melt, the greater their resistance and the less likely it is to fill the recess within a short time, thus reducing the contour of the recess pattern. It was easier to make a clear transfer.

As described above, with the conventional method, it is difficult to faithfully transfer and coat the outline of the required pattern of recesses.

The motive of the present invention was to transfer and coat the molten material inside the recesses of a desired pattern faithfully according to the contours of the pattern.

[Means for Solving the Problems] The purpose of the present invention is to prevent air pockets from occurring in the recesses when a molten material is deposited on the roll surface in a roll coating method. , as a means.

Instead of the conventional roll dipping method, the melt is supplied to the roll surface by discharging the melt from a nozzle and using the discharge pressure to sequentially fill one corner of the concave part of the pattern, thoroughly filling every corner of the concave part while expelling air. The focus was on filling in the gaps.

Next, the method of the present invention will be explained with reference to the drawings. Refer to FIGS. 1 to 9, it has a certain required pattern of recesses IG (FIGS. 1 and 2). The melt is discharged from the nozzle 3 at a right angle or an angle close to the surface of the so-called recessed roll 1. The melt is.

It is melted and pressurized using a hot melt applicator (not shown).

It is desirable that the distance between the tip of the nozzle 3 and the surface of the roll 1 be as small as possible, in order to suppress a drop in discharge pressure as much as possible.

The melt M discharged from the nozzle 3 in this way is as follows.

As shown in FIG. 3, the discharge pressure is injected into the concave IC from one side of the concave IC, and at the same time, the air Ar in the concave part is
It gradually enters and expands while expelling from the other side of the recess, filling the inside of the recess from corner to corner. Therefore, air is no longer trapped in the recesses as in the prior art described above.

Thereafter, the surface of the recessed roll 1 is scraped off with a doctor blade 5. At this time, the two surfaces of the molten material Mc filled in the recess are recessed (M
cf). The reason for this is that when the tip of the doctor blade 5 passes over the surface of the recessed portion, a force is applied that strips off the molten material within the recessed portion. However, the degree of depression, ie, the size, depth, shape, etc. of the depression, depends on the viscosity of the melt, the distance between the doctor blade and the roll surface, the rotational speed of the roll, etc.

In this way, the molten material Me in the recessed portion rotates and moves together with the recessed roll 1 (Fig. 5), and then encounters the object W to be coated, comes into pressure contact with it, and is transferred and coated onto the surface of the object W. As shown in FIG. 6, a pattern is obtained in which the above-mentioned recesses become hollow portions Ar during coating.

As mentioned above, compared to the conventional roll coating method.

A sharper application pattern is obtained, which is also more effective the smaller the recesses and the higher the viscosity of the melt.

In the above description, the method of supplying the melt to a roll having recesses, that is, a roll with recesses, has been described, but a belt with recesses may be used instead of the roll with recesses. Referring to FIG. 13, a recessed belt 21 having recesses in a required pattern is attached to the surface of the running belt 21A. The molten material M is discharged from the nozzle 23 onto the upper surface of the belt with recesses and retains the residual pressure of the discharge pressure.

is discharged onto the surface of the belt 21 with recesses. The molten material M3 enters and fills the recesses without any corners while expelling air, just as in the case of the roll with recesses described above.
The molten material having the same pattern as the recessed portion is transferred and coated onto the surface of the object W7.

Moreover, instead of the above-mentioned recessed roll or recessed belt, the present invention can also be applied to a plate having recessed portions, that is, a recessed plate. In this method, the melt is sequentially discharged from a nozzle onto a plate with recesses from one side to the other, as in the case described above, and the air in the recesses is expelled and filled. Then, use a doctor blade or the like to scrape off the molten material on the surface of the plate with recesses, leaving the molten material only in the recesses, and then cover it with a sheet to be coated from above and press it onto the surface of the sheet. Although the above operations for transfer-coating the molten material in the recesses can also be performed manually, a case where these are performed automatically will be described below. Please refer to FIG. 15, which shows a method of reciprocating the plate with recesses back and forth. First, the plate with recesses 31 starts from the forward start position, and reaches approximately the middle of its stroke S (S1 ) until.

The molten material Ms is discharged onto the surface of the plate 31 with recesses, then doctored, and after completing the latter half of the stroke S2, the object to be coated is applied onto the surface of the plate 31 with recesses at the final position B. Cover it with a certain sheet W3b and pressurize it.

Transfer coating is performed.

Note that it is also possible to apply the above-mentioned recessed roll, a belt, a plate, etc. with engraving or etching, a gravure plate, etc. applied to the belt or plate.

Furthermore, in each of the above-mentioned methods, a melt is used as the coating material, but similar actions and effects can be achieved with a liquid that is at room temperature.

In each of the above-mentioned methods, the type of nozzle varies depending on the conditions to be sprayed, but any suitable round hole nozzle, dovetail nozzle, slit nozzle, slot nozzle, etc. can be used.

In addition, during work, it is necessary to keep the amount of doctoring at an appropriate amount, not too much, but in order to cope with this, it is necessary to adjust the discharge from the nozzle, or use a rotating roller such as a recessed roll. Table 1m It is preferable to adjust the speed.

Further, for various patterns of concave portions, at the same time, the flow rate discharged from the nozzle in the same unit time is at least larger than the total volume of the concave portions at the circumferential velocity of the axillary portion.

It is also necessary that the flow velocity discharged from the nozzle is at least higher than the circumferential velocity of the roll.

Next, the structure of each device based on the above three methods will be explained for each item.

A. Roll-type coating device with recesses Please refer to FIG. 10, the surface of the roll with recesses, that is, the roll with recesses 11, is approximately perpendicular to the surface, or at least at an acute angle in the rotational direction "R8" of the roll. To.

A melt discharge nozzle 13 is provided, and the distance between the nozzle and the surface of the recessed roll 11 is set as close as possible. The reason for this is to prevent the discharge flow from being opened due to pressure and to prevent the residual pressure in the discharge flow from decreasing as much as possible. Moreover, the position of the nozzle 13 is on the surface of the recessed roll 11 at the point of contact with the object W1 to be coated "S, ++
Therefore, it is desirable to provide a short distance nT8'' back in the rotational direction of the roll "R%" as long as there is no problem, but a doctor blade 15 is provided between that short distance. As shown in FIG. 1X, the cutting edge 15T of the doctor blade is formed at a required angle β1 which is non-perpendicular to the rotational direction "R1" of the recessed roll 11 when viewed from above.
It can be installed diagonally. The reason for this is that the residue of the molten material scraped up by the doctor blade 15 is moved along the above-mentioned oblique angle and discharged to the outside of the two machines. In addition, the cutting edge of the doctor blade is the 12th
As shown in the figure, it is required that the roll 11 be processed with a radius r of the roll 11 in an angular state in which it is attached obliquely to the surface of the roll with recessed portions. The reason is that the gold edge of the cutting edge 15T of the doctor blade 15 is always in contact with the flat surface of the recessed roll 11. However, if the doctor blade is installed on the lower half of the upward side of the roll as shown by the imaginary line (15A) in the figure, the blade should be installed at an angle β, even if it is perpendicular to the roll rotation direction. good.

Note that the recessed roll 11 is connected to a drive device 12, and at the contact portions "5" and "n" with the above-mentioned object W.

A pressure roll 19 is provided oppositely. Also the above gun 1
4 is connected by piping to the heating melting and pumping device 16 and electrically connected to the controller 18 in parallel.

B. Belt type coating device with recesses Please refer to FIG. A belt with a recess, that is, a belt with a recess 21 is attached to the running belt 21A.

It has heat resistance and incompatibility with heated melts. Alternatively, the running belt itself may be provided with the above-mentioned characteristics.The recessed belt 21 is mounted on a drive roll 29A and a driven roll 29B for belt running, as in general, and Pinch rolls 20A and 20B are attached approximately in the middle, sandwiching the recessed belt 21. Above the recessed belt 21 on the side of the driven roll from the pinch roll, a melt discharge nozzle 23 is installed toward the upper surface of the belt, either at a right angle or at an acute angle to the belt running direction "R2'.
is provided as close to the surface of the belt 21 with recesses as possible. Further, a doctor blade 25 is provided between the nozzle 23 and the pinch rolls 20A and 20B.
14, and the doctor blade is mounted non-perpendicularly to the running direction of the recessed belt 21 in plan view, at a certain required angle β2, that is, obliquely, as shown in FIG. The distance T2 between the nozzle 23 and the pinch rolls 20A and 20B is desirably as short as possible without causing any problems.

In addition, if necessary, the nozzle and doctor blade may be arranged as shown by imaginary lines in the figure (23A, 24A).

25A) may be provided on the surface of the recessed belt 21 running on the outer surface of the driven roll 29B, however, the distance between the nozzle 23A and the pinch rolls 20Δ, 20B is
It is inevitable that it will become bigger.

The gun 24 or 24A is connected to the heating melting and pumping device 26,
In addition, the controller 28 is connected via a solenoid air valve.
connected to.

Please refer to FIG. 15 of the plate type coating device with C1 recess. Rod 3 of air cylinder 39
A plate 31 with a concave portion is placed on the carriage 30 directly connected to the
is attached, and many rollers 40 are attached to the lower surface of the carriage.
is provided. A melt discharge nozzle 33 is provided above the concave plate and faces the plate, and its position is approximately in the middle of the entire stroke S of the carriage 30, at least at the starting position of the carriage 30. , the nozzle 33 is attached to a gun 34, preferably near the forward end of the concave plate 31 on the table in the forward direction, and is connected by piping to a heating melt pumping device 36. Further, a doctor blade 35 is provided on the forward direction side of the nozzle in contact with the surface of the plate 31 with recesses. The doctor blade is mounted at a non-perpendicular angle β with respect to the forward direction R1, as shown in FIG.

At the end point of the forward movement of the plate 31 with recesses on the carriage 30, the sheet coating device 51 applies the sheet W3a, which is the object to be coated, on the plate surface one by one.
(W3b) and pressurized at the same time. In the figure, a butterfly type sheet coating device 51 is shown as a sheet coating device. Furthermore, a sheet feeding device is provided above the sheet coating device, and in the figure, a roll feeding type sheet feeding device 47 is shown. Further, below the sheet coating device 51,
A conveyor type sheet ejector 70 is shown.

In addition, the air cylinder 39 for reciprocating operation and the air cylinder 52 for opening and closing the coating plate 54 in the sheet coating device 51 are connected to the operating air source 61 and the controller 38 via solenoid air valves 46.65. Also, the gun 34 to which the nozzle 33 is attached. It and a motor 48 in the sheet feeding device 47 are connected to the controller 38.

Further, if necessary, the coating plate 54 of the sheet coating device 51 may be
A pressure 60 is provided above when the door is closed (54a). Further, a chute 68 is provided below the sheet coating device 51, and a belt conveyor 70 is provided below the chute 68.

[Function] The functions of the three types of devices mentioned above will be explained one by one for each item.

Δ, roll type coating device with recesses Please refer to FIG. The recessed roll 11 is rotated in the "R1" direction by its driving device 12. Nozzle 13
The melt M discharged from the recessed portion 11 is discharged almost perpendicularly toward the recessed portion 11C of the recessed roll 11, and while the discharge pressure remains, the melt M is discharged from one of the recessed portions toward the other.

While expelling the air inside, it enters every corner and fills it. In this state, the recessed roll 11 rotates upward, and then the molten material on the surface of the recessed roll 11 is scraped off by the doctor blade 15, leaving only the molten material filled in the recessed parts. At that time, the above doctor blade 1
The excess melt scraped onto the back side of roll 11
The recessed roll 1
1 is pushed outward. Subsequently, the roll 11 with recesses
encounters the object W1 to be coated, and the molten material M2 filling the recesses is transferred and coated onto the surface of the object W1 along the outline of the pattern of the recesses. Note that detailed explanations of these effects are omitted since they were explained in Section 1, Method of the Present Invention.

B. Recessed belt type coating device Please refer to FIG. 13, in which a recessed belt is used instead of the recessed roll described above. The function of filling and transferring the melt into the recesses is similar to that of the recesses on the roll described above, but here are some features compared to this.

■ Because the discharge is performed in a state where the discharge cloth is almost horizontal.

Even if the viscosity of the melt is lower, transfer coating can be performed without flowing out from within the recess.

■ The edge of the doctor blade can be straight, making it easy to manufacture.

■ The manufacturing cost of belts with recesses is lower.

C4 recessed plate type coating device Please refer to FIG. 15. First, start from the starting point of the forward movement of the reciprocating recessed plate 31. After starting.

In response to a signal from the controller 38, the melt is discharged from the nozzle 33 and is sprayed onto the surface of the plate 31 with recesses. The molten material having a discharge pressure enters the recess thoroughly while expelling air as described above, and is then doctored. The above-mentioned cloth dispensing operation is interrupted by a signal from the controller 38 at approximately the middle (S□) of the stroke S of the above-mentioned "forward" operation, and the recessed plate moves forward through the remaining stroke S2 and ends. At that position, the sheet application device 51 is activated to apply the melt M filled in the recesses on the plate.
A coating plate 54 is placed on the surface of 6 holding the sheet W, a to be coated (W, b), and pressurized to transfer the melt M onto the surface of the sheet W, b. The coated sheet W3b is then coated (M6), and then, together with the coated plate 54, the coated sheet W3b is turned around about its fulcrum 56 and returned to its original position. Then, the locks 55 of the application sheets W and b are released, and the sheets are moved along the chute 68 to the belt conveyor 70 below.
It is placed on top and discharged.

In addition, the above-mentioned three types of rolls with recesses or the same belt,
Similarly, the recesses in the plate may be finely carved or etched recesses, and therefore can be applied to gravure plates and the like.

[Effects] According to the method and apparatus of the present invention, in transfer application of a certain pattern of a melt or liquid, the air in the pattern is expelled while the melt or liquid is filled in the area, and the pattern is transferred. This method allows transfer coating to be applied faithfully onto the surface of the object to be coated without disturbing the outline or thickness of the surface, and can also be applied to gravure rolls and the like that have minute recesses.

[Brief Description of the Drawings] Fig. 1 is an explanatory diagram of the operation of the method of the present invention. Fig. 2 is an enlarged explanatory diagram of section 'A' in the same diagram as above. Fig. 3 is also an explanatory diagram of section 'B' in the fourth
The figures are the same C'' section. Figure 5 is the same as the "D" section. Figure 6 is the same as the E' section. "U" arrow view 1st
Figure 0 is a side view of the roll-type coating device of the present invention. Figure 11 is a plan view of the installation of the doctor blade in the same figure.
The figure is an explanatory diagram of the curve of the cutting edge of the doctor blade.
Fig. 13 is a side view of the belt-type coating device of the present invention. Fig. 14 is a plan view of the installation of the doctor blade in the same figure as above. Fig. 15 is a side view of the plate-type coating device of the present invention.
Figure 16 is a plan view of the installation of the doctor blade in the same figure as above. Figure 17 is a side view of a conventional roll-type coating device.
Figure 18 is an enlarged explanatory view of the "H" section of the same diagram as above. Figure 19 is the same "■" section. Figure 20 is the same "J" section 21.
Figure 22 is the same "L" section Figure 23 is the same P" section Figure 24 is the same "Q" section
Figure 25 @ is an explanatory diagram of the pressurized state of the applied material in the "P" and "Q" parts. Figure 26 is 11Y in the same figure above.
11 arrow view

Claims (1)

[Claims] 1. The tip of the nozzle (3) for discharging the pressurized melt (M) is formed against the rotating upward surface of the roll (1) having a certain pattern of recesses. The discharge pressure of the molten material (M) passing through the gap (C) is suppressed from decreasing due to release by making the molten material (M) as close to each other as possible, and the molten material (M) discharged under this condition is transferred to the recess (1c). The pattern is sequentially moved from one side to the other according to the rotation of the roll, and at the same time, while expelling the air (Ar) in the recess (1c), the recess is filled without any corners, and then the flat surface of the roll is A method for applying a molten material, which comprises scraping off the molten material adhering thereto, and transferring and coating only the molten material (Mc) in the recess (1c) onto the surface of the object (W) to be coated. 2. The flow rate per unit time of the melt discharged from the nozzle (3) is at least larger than the total volume per unit time of rotational movement of the concave portion on the roll surface in the vicinity of the nozzle and the roll (1). and at the same time, the flow velocity of the melt discharged from the nozzle (3) is at least higher than the circumferential speed of the roll (1). . 3. The method for applying a melt according to claim 1, wherein the roll (1) having a recessed portion is a belt (21) having a recessed portion. 4. The method for applying a melt according to claim 1, wherein the roll (1) having a recessed portion is a plate (31) having a recessed portion. 5. The method for applying a melt according to claim 1, 3, or 4, wherein the recess is carved or etched. 6. The method for applying a melt according to claim 1, wherein the nozzle (3) is a hole nozzle, a slit nozzle, a slot nozzle, or the like. 7. Claim 1 in which the melt is a thermoplastic resin
Method for applying the melt described in Section 1. 8. The method for applying a melt according to claim 1, wherein the melt is a hot melt adhesive. 9. The method for applying a liquid according to claim 1, wherein the melt is a liquid. 10. In a roll-type coating device having a recess, a.
_1) be provided; and b. the position of the nozzle (13) is the same as that of the roll (11);
c.
A doctor blade (15) is provided between the nozzle (13) and the pressure roll (19) of the transfer coating section ("S_1"), and the tip edge (15T) of the blade is connected to the roll ( 11) obliquely (β_
1), and when the blade (15) is mounted on the roll, the blade (15) is machined to have the radius (r) of the roll; and d, the nozzle (13) is heated via a gun (14). 1. A melt coating device, characterized in that it is connected via piping to a melt pressure feeding device (16). 11. The melt coating device according to claim 10, wherein the attachment angle (β_1) of the doctor blade is perpendicular to the rotational direction of the roll. 12. In the belt-type coating device, a. A belt (21) having a recessed portion of the required pattern is provided on the running belt (21A), and b. A drive roll (29A) for driving the belt and its driven member. The upper belt between the upper belt and the roll (29B) is provided with pinch rolls (20A, 20B) that sandwich the belt vertically, and c. Distance required toward the direction (T_2)
d. A pressurized melt discharge nozzle (23) is provided as close as possible to the upper surface of the belt (21) having the recess; d. ) and upper pinch roll (20B)
(T_2), a doctor blade (25) is provided non-perpendicularly, that is, obliquely (β_2) to the running direction (R_2) of the belt (21); e. The nozzle (23) is A melt coating device characterized in that it is connected via a gun (24) to a heating melt pressure feeding device (26) via piping. 13. In the plate-type coating device, a. A plate (31) having a concave portion is attached to a reciprocating table (30) that is connected to the rod (32) of the air cylinder (39) and reciprocates on the roller 40. and b, the front (R_3) of the plate (31) having the above-mentioned recessed part.
In the starting position of operation, a pressurized melt discharge nozzle (33) is mounted on the forward side of the plate, that is, approximately at the midpoint of the full stroke (S) of the carriage, above the surface of the plate (31). c. The plate (3) is provided on the forward side of the nozzle (33).
1) the doctor blade (35) relative to the plane is installed non-perpendicularly, that is, obliquely (β_3) to the forward direction (R_3) of the plate (31); and d. the end position of the forward movement (R_3). , the plate (31) is coated with a sheet (W_3a
), and e. the nozzle (33) is connected via a gun (34) to a heating melting and pressure feeding device (36). A melt coating device characterized by: 14. The melt coating apparatus according to claim 10, 12, or 13, wherein the recess is carved or etched. 15. The melt coating apparatus according to claim 10, 12, or 13, wherein the nozzle (13 or 23, 33) is a hole nozzle, a slit nozzle, a slot nozzle, or the like. 16. The melt coating apparatus according to claim 10, 12, or 13, wherein the melt is a thermoplastic resin. 17. The melt coating device according to claim 10, 12, or 13, wherein the melt is a hot melt adhesive. 18. The liquid coating device according to claim 10, 12, or 13, wherein the melt is a liquid.