JP3010489B1 - Variable T-die for hot melt - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To easily adjust the width of a coating film when applying a hot melt agent in a thin film form. SOLUTION: A die body (1) is provided with a discharge port (2) that opens in a slit shape in the lateral direction. A manifold (4) having a plurality of branch channels (3) is formed so as to supply the hot melt agent along the discharge port (2).
Control valves (6)... Are provided in each of the branch channels so as to control the flow of the hot melt agent flowing through the branch channels (3). There is a moving means for inserting a shim (7) into the discharge port (2) and moving the shim (7) in the lateral direction. By moving the shim (7), the opening size of the discharge port (2) is changed, and the width of the coating film can be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt T-die for applying a hot-melt agent in a thin film, and more particularly to a variable T-die for a hot-melt agent capable of changing a coating width. It is.

[0002]

2. Description of the Related Art In recent years, in the step of bonding each member using a hot melt agent, the hot melt agent has been coated in a film shape and a required member has been bonded to obtain a product. The bonding process is frequently used. Among such products, there are products, such as wrapping materials for wood products, which require adjustment of the application width of a hot melt agent for each product lot.

Conventionally, when a hot melt agent is applied in the form of a film, a T-die substantially similar to a T-die used for a laminator of a plastic film is used. This T die
It is configured to discharge the hot melt agent from the slit-shaped discharge port formed in the die body, but in order to keep the thickness of the coating film constant, the temperature is adjusted to change the viscosity of the hot melt agent. It is necessary to adjust the flow rate or mechanically change the clearance of the opening of the discharge port to adjust the flow rate. Also, in order to change the coating width, a plurality of shims having opening windows of various opening widths are prepared in advance according to the coating width, and when changing the coating width, a shim of the discharge port is required. In other words, the hot melt is discharged only from the portion corresponding to the opening window, so that the hot melt is applied to a predetermined width. Therefore, in the conventional T-die, the adjustment of the thickness of the coating film is complicated, and in order to change the coating width, it is necessary to disassemble the die body and replace the shim. It was often observed that the hot-melt agent leaked out of the area other than the opening window and dripped.

[0004]

The problem to be solved by the present invention is as follows.
In the T-die for hot-melt agent that discharges the hot-melt agent in the form of a film, the coating width of the coating film can be easily adjusted, the leakage of the hot-melt agent does not easily occur, and the thickness of the coating film can be easily adjusted. To provide a variable T-die for a hot melt agent.

[0005]

According to the present invention, there is provided an outlet having a slit shape for discharging a hot melt agent in a film form, and a plurality of branches for supplying the hot melt agent along the outlet. Forming a manifold having channels in the die body at intervals in the horizontal direction, and providing a control valve for controlling the flow of the hot melt agent passing through each channel in the branch channel,
A variable T for a hot melt agent, wherein a shim for closing the discharge port is inserted into the discharge port, and a moving means for moving the shim laterally along the discharge port so as to partially open the discharge port is provided.
A die is provided to solve the above problems.

[0006]

FIG. 1 is an explanatory diagram showing a basic configuration of the present invention. In the figure, a die body (1) has a discharge port (2) that opens in a slit shape in the lateral direction of the body (1).
And a plurality of, in the figure, six branch flow paths (3) to supply the hot melt agent along the discharge port (2).
..Manifolds having laterally spaced spaces (4)
Are formed. Then, the hot-melt agent melted from the supply port (5) communicating with the manifold (4) flows into the die body, whereby the hot-melt agent is discharged in a film form from the discharge port (2), Form a coating. In the figure, the opening width of the discharge port is shown large for convenience of description, but in actuality, it is formed in a narrow gap of about 0.1 to 0.5 mm.

A control valve (6) for controlling the flow of the hot melt agent passing through each of the branch flow paths (3).
Are provided. Shims (7) and (7) for closing the discharge port (2) are inserted into the discharge port (2),
Appropriate moving means is provided for moving the shim laterally along the discharge port so as to partially open the discharge port. As a result, the hot melt agent is discharged from the discharge port (2) only from the branch flow path where the control valve (6) is opened to open the flow path
By moving the shim (7) in accordance with the opening and closing to partially open the discharge port (2),
The coating width of the coating film can be changed as described later.

FIG. 3 is a sectional view showing an embodiment of the present invention. In the drawing, a die body (1) is supported on a mounting mount (9) via a heat insulating plate (8).
And a die support (11) which is screwed to the dice (10) so as to form a discharge port (2) between the dice (10) and the dice (10).
The heater (12) is provided on each of the dive (10) and the die support (11). The dice (10) has a supply port (5) through which a hot melt agent is supplied from a supply source (not shown) and a branch flow path (3) leading to the discharge port (2). Manifold with (4)
Are formed.

The branch flow path (3) is provided with a hole-shaped valve seat on the way.
(13), the valve stem of the control valve (6) facing the valve seat (13)
A valve body (15) formed at the tip of (14) is located. The valve stem
(14) is provided with a piston (16), and by supplying air from the opening (18) or (19) formed in the air block (17), the piston (16) rises or falls in the figure, The valve body (15) is separated from the valve seat (13) or fitted into the valve seat (13) to open and close the flow path (3). On this occasion,
As shown in the figure, an adjusting rod (20) is screwed to the control valve (6) in opposition to the valve rod (14), and the adjusting rod (2) is turned by a knob (21).
0) is advanced and retracted, and when the valve stem (14) rises, the adjusting rod (2)
If the stop position of the valve stem can be adjusted by contacting the lower end (22) of the valve stem (0) with the upper end (23) of the valve stem (14), the valve element (1) can be adjusted.
5) The flow rate of the hot melt agent can be adjusted by changing the opening interval between the valve seats (13). Note that FIG. 3 shows a state in which the adjustment rod (20) is screwed to the lowermost end to close the flow path, and the valve body (15) is raised from the state shown in the figure to open the flow path. In this case, the adjustment rod (20) must be rotated to ascend, and a gap must be left between the upper end (23) of the valve rod (14) and the lower end (22) of the adjustment rod (20). The adjustment position of the adjustment rod (20) may be held by a lock nut (24). As the control valve, an appropriate flow rate adjusting valve having an ON-OFF function can be used instead of the illustrated configuration.

The flow passage ahead of the valve seat (13) opens at a substantially U-shaped receiving groove (25) formed laterally along the discharge port at the inner end of the discharge port (2). are doing. A substantially U-shaped receiving groove (26) is formed on the die support (11) facing the receiving groove (25), similarly to the receiving groove (25). These receiving grooves (25),
Auxiliary plates (27) and (28) are slidably fitted in (26). A shim (7) is sandwiched between the auxiliary plates (27) and (28), and mounting screws ( The shim (7) is supported by fixing the two auxiliary plates (27) and (28) with 29). The receiving groove and the auxiliary plate may be provided on only one of them.

As the shim (7), a plate-like body having a thickness corresponding to the dimension in the thickness direction of the discharge port (2) is used. Usually, this thickness is as thin as about 0.1 to 0.5 mm, so the shim is easy to bend and deform easily, but if it deforms, loosen the mounting screw (29) and use the auxiliary plate (28). It can be easily replaced by removing it. The inner end (30) of the shim (7)
Are bent so as to expand outward from the inside of the discharge port (2) toward the opening edge as shown in FIG. Also, in the figure, two shims (7) and (7) are provided on both sides of the center of the die body (1) so that each shim moves. One shim may be used according to the application pattern, or only one of the shims may move.

FIG. 4 shows an embodiment of the moving means for moving the shim. In the figure, auxiliary plates (27) and (28) for holding the shim (7) are attached to a connecting plate (31) located outside the die body (1). ,
Operation shaft (33) rotatable via thrust bearing (32)
A handle (34) is provided outside the operation shaft (33), and a screw shaft (35) is formed inside the operation shaft (33). The screw shaft (35) is threadedly engaged with a female thread portion of the side plate (36) fixed to the die body (1), and is inserted into a hole (37) formed along the discharge port in the die body (1). Extending.

The connecting plate (31) is provided with a guide rod (38) for guiding the shim, the auxiliary plate and the like so as to easily move in the lateral direction along the discharge port. (38)
Is provided with a scale (39) for determining the opening size of the discharge port due to the movement of the shim. As shown in FIG.
The die support (11) of the die body (1) is provided with a guide rod receiver (40) so as to support the guide rod (38), and a receiving groove (41) formed in the guide rod receiver (40). The guide rod (38) is slidably inserted therein. A guide rod receiving plate is provided on the front surface of the guide rod receiver (40) so as to close the front surface of the receiving groove (41).
(42) is provided.

With the above structure, when the handle (34) is rotated, the screw shaft (35) is rotated, and the screw shaft (35) is engaged with the side plate (36) attached to the die body (1). Therefore, the connection plate (31) moves in the axial direction together with the screw shaft. Thus, the shim (7) inserted in the discharge port (2)
Moves laterally, and can change the opening size of the discharge port. As shown in FIG. 2, the shim is inserted into the discharge port from both sides of the discharge port. Therefore, the moving means are also provided on both sides of the die body, and each shim is moved by the two moving means. Can be done.

The moving means uses a screw mechanism. FIG. 5 shows an embodiment of the moving means using a gear mechanism. In the figure, connecting plates (43) and (44) to which auxiliary plates (27) and (28) holding the shim (7) are attached are provided on both sides of the die body so as to face each other. , (44) are formed with inward racks (45), (46). The racks (45), (46) engage with pinions (47) provided between the racks, respectively. are doing. Rotation axis (48) of the pinion (47)
Is rotated by a driving device (not shown) such as a handle or a motor provided on the die body. By rotating the rotary shaft (48), the racks (45) and (46) move in a direction away from each other or in a direction approaching each other. The opening size can be changed. By using a motor, an encoder, or the like, the opening size can be accurately adjusted by automatic control. As the moving means, in addition to the above embodiments,
A configuration including a cylinder mechanism, a link mechanism, and other appropriate mechanisms can be adopted.

With the above configuration, the variable T die of the present invention can obtain coating films having various application widths. FIG.
One embodiment of the present invention will be described.
The branch passages (3b) and (3b) are opened at a position 5 mm away, and the branch passages (3c) and (3c) are further opened at a position 120 mm away. 160 mm, and control valves (6a), (6a), (6b), (6b), (6
c) and (6c), respectively, first, the control valve (6
b), (6b), (6c), and (6c) are closed, control valves (6a) and (6a) are opened, and the hot melt flows to the discharge port only from branch flow paths (3a) and (3a). In this case, by moving the shims (7), (7) laterally to a position beyond the branch flow paths (3a), (3a), a coating film having a width of about 80 to 150 mm can be obtained. . Next, the control valve (6b), (6b) is controlled to simultaneously supply the hot melt agent from the branch flow path (3b), (3b), and the branch flow path (3b), (3b) Shim to the position exceeding (7), (7)
Is moved laterally to obtain a coating film having a width of about 150 to 240 mm. Finally, the control valves (6c), (6c)
By controlling the above, the branch flow paths (3c) and (3c) are opened to supply the hot melt agent from all the branch flow paths to the discharge ports, whereby a coating film having a width of about 240 to 320 mm can be obtained. it can. These application widths can be read by the above scale (39).

Since the thickness of the coating film can be adjusted by the flow rate of the hot melt agent supplied to the discharge port, a desired flow rate can be obtained by controlling the flow rate of the hot melt agent passing through each branch channel by the control valve. It can be adjusted to the thickness of the coating.

[0018]

According to the present invention, there is provided a discharge port having a slit shape so as to discharge a hot melt agent in a film form, and a plurality of branch ports for supplying the hot melt agent along the discharge port. Forming a manifold having channels in the die body at intervals in the horizontal direction, and providing a control valve for controlling the flow of the hot melt agent passing through each channel in the branch channel,
A shim for closing the discharge port is inserted into the discharge port, and moving means for moving the shim laterally along the discharge port so as to partially open the discharge port is provided. By opening the branch flow path and moving the shim in a range corresponding to the opened branch flow path, a coating film of a hot melt agent having a desired width can be applied, and a screw mechanism or a gear mechanism is used. The moving means makes it easy to change the coating width.In this case, the other branch flow paths are closed, and the shim covers the other part of the discharge port, so that unnecessary hot melt agent may drip. In addition, by controlling the flow rate of the hot melt agent passing through the branch flow path by the control valve, it is easy to adjust the thickness of the coating film, which is suitable as a surface coat of the hot melt agent. Can be used.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of the present invention.

FIG. 2 is a front view showing one embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2;

FIG. 4 is a perspective view showing an embodiment of a moving unit.

FIG. 5 is an explanatory view showing another embodiment of the moving means.

FIG. 6 is an explanatory diagram showing an operation state.

[Explanation of symbols]

 1 Die body 2 Discharge port 3 Branch flow path 4 Manifold 6 Control valve 7 Shim 31 Connecting plate 34 Handle 35 Screw shaft 38 Guide rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05C 5/00-5/04 B05B 1/04 B05C 11/10

Claims (6)

(57) [Claims] 1. A discharge port which is opened in a slit shape so as to discharge a hot melt agent in a film form, and a plurality of branch flow paths are laterally spaced so as to supply the hot melt agent along the discharge port. Forming a manifold having a die body, providing a control valve for controlling the flow of the hot melt agent passing through each flow path in the branch flow path, inserting a shim closing the discharge port into the discharge port, A variable T-die for a hot melt agent, comprising a moving means for moving the shim laterally along the discharge port so as to partially open the discharge port. 2. The variable T-die for a hot melt agent according to claim 1, wherein the control valve is provided so as to be capable of adjusting a flow rate of the hot melt agent flowing through the branch flow path. 3. The hot melt according to claim 1, wherein the shim is supported by an auxiliary plate, and the auxiliary plate is slidably fitted in a receiving groove formed in the die body along the discharge port. Variable T die for agent. 4. The variable T-die for a hot melt agent according to claim 1, wherein two shims are inserted into the discharge port, and each of the shims is movable. 5. The variable T-die for a hot melt agent according to claim 1, wherein said moving means includes a screw mechanism. 6. The variable T-die for a hot melt agent according to claim 1, wherein said moving means includes a gear mechanism.