JP4154668B2 - Nozzle for applying adhesive to filament - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nozzle for applying an adhesive to a thread-like body, and more particularly to an improvement in an application nozzle for an adhesive such as a hot melt adhesive to a thread-like body such as a thread, an elastic thread rubber, and a thin string.
[0002]
[Prior art]
For example, an adhesive application nozzle 25 shown in FIGS. 12 to 14 is used as a nozzle for applying an adhesive such as a hot melt adhesive to a thin thread rubber or the like that is bonded to a sanitary article such as a disposable diaper. 12 is a front view (partial cross-sectional view) showing the overall configuration of the adhesive application nozzle, FIG. 13 is a left side view of FIG. 12, and FIG. 14 is a partially enlarged side view taken along line HH in FIG. . In these drawings, the adhesive application nozzle 25 is configured by integrally connecting a nozzle body 26 and a nozzle plate 27, and a traveling direction ( I) in a direction orthogonal to the predetermined interval (P₁, P₂, P₃, P₄, P₅) And a plurality of (in this example, four) slit guide grooves 34 for running rubber thread are formed.
[0003]
The nozzle body 26 is formed with a triangular groove (indentation) 30 as an adhesive passage in the joining plane with the nozzle plate 27 (see FIG. 13), and is connected to the top of the triangular groove 30 in the vertical direction. An extended adhesive passage hole 29 is formed, and an adhesive supply hole 28 connected to the adhesive passage hole 29 and extending in the lateral direction is provided with an open end. The triangular groove (depression) 30 becomes a closed space by the joining plane of the nozzle plate 27 and functions as an adhesive passage.
[0004]
V is a valve unit (gun module) having a built-in valve mechanism (not shown) for supplying and stopping the adhesive, and the adhesive application nozzle 25 is integrally coupled to the valve unit V, and the adhesive passage hole. 28 communicates with an adhesive passage (not shown) on the downstream side of the valve mechanism of the valve unit V. The valve unit V communicates with the upstream adhesive passage of the valve mechanism and is connected to a hot melt melt pressure feeding device (not shown) via a heating hose (not shown).
[0005]
An adhesive orifice 31 as an adhesive discharge port is provided at the lower end of the triangular groove passage 30 so as to communicate with the triangular groove passage 30 at the position where each of the slit-shaped guide grooves 34 is formed. Each slit-shaped guide groove 34 is opened at the root (vertex) 34a. The orifice 31 is formed as an elongated groove (dent) in the nozzle body 26 in the same manner as the triangular groove passage 30 and is a space closed by a joining plane of the nozzle plate 27 and functions as an adhesive orifice. Reference numerals 32a and 33a denote inner wall surfaces of the slit-shaped guide grooves 34 that exist on both the left and right sides of the rubber thread 20 in the direction orthogonal to the traveling direction of the rubber thread 20 at the opening position of the orifice 31, respectively.
[0006]
Thus, in the adhesive application nozzle 25 having such a configuration, four thread rubbers 20 that run in the direction indicated by the arrow I by a thread rubber travel device (not shown) are respectively connected to the nozzle 25 for running the rubber thread. Guided by the slit-shaped guide groove 34 and guided to the lower end opening position of the orifice formed in the root 34 a inside the slit-shaped guide groove 34 while being in contact with the root 34 a inside the slit-shaped guide groove 34. Then, the valve mechanism is intermittently opened and closed by the valve unit V, and the adhesive is intermittently discharged from the lower end opening of the adhesive orifice 31 and applied to the rubber thread 20. The thread rubber 20 is, for example, a thin elastic thread having a diameter (thickness) of 0.35 mm, and the slit width of the root 34 a inside the slit-shaped guide groove 34 is also formed with the same width as the diameter of the thread rubber 20.
[0007]
On the other hand, Patent Document 1 discloses an adhesive application nozzle for thread rubber that adheres to a disposable diaper. The nozzle is formed of a triangular prism-shaped first member, a plate-shaped second member, and a plate-shaped third member, and the three members are integrally coupled, and the first member has a lower end portion thereof. A plurality of (three) thread rubber travel guide slits are formed at intervals, and the second member has an adhesive supply and thread rubber guide slit at the lower end thereof at equal intervals to the slits of the first member. The same number of slits for guiding rubber thread are formed at the lower end of the third member at the same interval as the slits of the first and second members. The slits formed in the respective members are formed into a plurality (three) of integrated slots whose lower ends are opened by integrally connecting the members.
[0008]
In this configuration, three thread rubbers are guided and run by a plurality of slots of the adhesive application nozzle, and hot melt adhesive supplied from the slits of the second member is discharged to each thread rubber. It becomes the composition applied.
[0009]
[Patent Document 1]
JP-A-58-180601 (FIGS. 7 to 10)
[0010]
[Problems to be solved by the invention]
The conventional nozzle for applying an adhesive to a filament has the following problems.
That is, the adhesive application nozzle 25 shown in FIGS. 12 to 14 has an advantage that the structure is simple and easy to maintain, but first, the valve mechanism of the valve unit V is closed during intermittent application to the rubber thread 20. After that, a certain amount of hot melt adhesive flowed out of the orifice 31 and threaded, and there was a problem that some adhesive remained on the portion where the thread rubber 20 was not applied, and the coating intermittentness was not good. . This is because a small amount of adhesive remaining in the adhesive passages 28, 29 and 30 after the valve mechanism of the valve unit V is drawn out from the orifice 31 with the help of the viscosity and the running force of the rubber thread.
[0011]
Further, when the extra adhesive that has not been applied to the thread rubber 20 during the operation of applying to the thread rubber falls off the nozzle 25 and is wasted, and another device exists below the nozzle. Has a problem in that the dropped adhesive adheres to the apparatus and soils the apparatus. That is, in the conventional nozzle 25, an orifice 31 is opened at a root 34 a inside the guide groove 34 that is the apex of the slit-shaped guide groove 34, and is orthogonal to the traveling direction of the rubber thread 20 at the opening position of the orifice 31. Since the inner walls 32a and 33a extending below the slit-like guide groove 34 are positioned in the left-right direction, excess adhesive that has not been applied to the rubber thread is transmitted to the inner walls 32a and 33a. This is because when the fixed amount is accumulated, it descends along the inner walls 32a and 33a and falls from the lower end.
[0012]
Further, when applying the adhesive to the rubber thread having a large diameter, there is a problem that the width of the slit-shaped guide groove 34 is constant and cannot be dealt with. Furthermore, although the rubber thread is connected on the way and there is a slightly thick seam, there is a problem that the rubber thread may be cut by the seam being caught in the slit-shaped guide groove 34.
[0013]
On the other hand, in the adhesive application nozzle shown in Patent Document 1, as in the case of the nozzle 25 in FIGS. 12 to 14, the adhesive remains in the application unnecessary portion of the thread rubber at the time of intermittent application, resulting in poor application intermittentness. The phenomenon that the adhesive descends along the inner wall on both sides perpendicular to the thread rubber traveling direction of the slit of the second member, falls from the lower end of the slit, and drops, the inapplicability of (large) thread rubber of different thickness, and The problem of cutting by catching the thread rubber on the slit of the seam is inevitable.
[0014]
The present invention has been made in view of the above-described problems, and does not cause the adhesive to fall off, has good intermittent application of the adhesive to the thread-like body such as thread rubber, and is also applicable to the application of thread-like bodies having different thicknesses. Another object of the present invention is to provide a nozzle for applying an adhesive to a thread-like body that can be prevented from being caught even in a string-like body having a thick portion such as a seam.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the following configuration was adopted for the nozzle for applying the adhesive to the filamentous body of the present invention.
[0016]
(1) A nozzle that applies an adhesive to a threaded body such as a running rubber thread. An adhesive discharge port for supplying and applying the adhesive to the threaded body, and guiding the threaded body to the position of the adhesive discharge port In a nozzle for applying an adhesive to a filamentous body having a slit-like guide grooveunderThe filament contacts the endTravelingProvide a plane toThe flat surface forms a lower end surface of the nozzle on the downstream side in the running direction of the filamentous body from the slit-shaped guide groove, and is provided to protrude at the lower end portion of the nozzle.The planeDownstream of the direction of travel of the threadThe adhesive discharge port is opened and the slit-like guide groove of the filament is provided upstream of the flat filament running direction.The adhesive discharged from the opening of the adhesive discharge port is applied to the filament that travels in contact with the plane.It was.
[0019]
(2)the above(1) In the adhesive application nozzle to the filamentous bodyTravelingThe flat surface to be further moved in the nozzle filament at the lower end of the nozzleDirection orthogonal toIt was set as the structure formed by making it protrude by forming a recessed part in the both right and left sides.
[0021]
(3) Above (1)Or(2In the nozzle for applying an adhesive to the thread-like body, the slit-like guide groove of the thread-like body is further in contact with the thread-like body.TravelingThe nozzle is configured to be movable so that the width of the slit-shaped guide groove changes with respect to the height level of the plane.
[0022]
(4) Above (1) to (3In the nozzle for applying an adhesive to the filamentous body, the blade further includes a blade portion on the downstream side in the traveling direction of the filamentous body so that the distal end can come into contact with the traveling filamentous body. It was set as the structure provided in the substantially same level as this level.
[0023]
[Action]
In the configuration of the above (1), a thread-like body such as a running rubber thread is guided by the slit-like guide groove, is brought into contact with the plane of the nozzle end, and is guided to the adhesive discharge port opened in the plane. A hot melt adhesive discharged from the adhesive discharge port is applied to the filamentous body.
[0024]
At this time, the opening of the adhesive discharge port is open in a plane, and the slit-shaped guide groove is located upstream of the plane in the running direction of the filamentous body. Excess adhesive that is discharged from the opening of the adhesive discharge port (orifice) and is not applied to the filamentous body is pulled away by the traveling inertia of the traveling filamentous body on the downstream side in the traveling direction of the filamentous body. It is. For this reason, it is prevented that it goes along the flat portion in the direction of the slit-shaped guide groove, and the excess adhesive that has not been applied is not propagated to the slit-shaped guide groove, and is transmitted through the slit-shaped guide groove. Therefore, there is little dropping of the adhesive from the nozzle.
[0025]
Further, by making the contact surface of the filamentous body flat, it is possible to make the length of one side in the left-right direction in the running direction larger than the thickness of the passing filamentous body. It is possible to cope with the change in the thickness even if the thread is not restrained and has a different thickness (for example, a thread having a diameter larger than that of the specified thread). Further, the contact of the thread-like body with the nozzle in the adhesive discharge portion is not performed on the narrow and narrow top surface inside the slit-like guide groove as in the conventional nozzle, but on a plane having a margin in the size. By doing so, there is an allowance for the filament to escape, and there is no fear of being cut even if the thick seam portion of the traveling filament passes.
[0026]
And thisIn this configuration, the filamentous body is in contactTravelingThe flat surface further forms the lower end surface of the nozzle on the downstream side of the slit-like guide groove in the running direction of the filamentous body. Accordingly, there is no path under which the excess adhesive propagates and descends, such as the inner wall of the slit guide groove of the conventional nozzle that is continuous with the plane, below the plane of the nozzle, and the adhesive drops from the nozzle. Can be prevented.
[0027]
And thisIn this configuration, the filamentous body is in contactTravelingFurther, the flat surface is provided so as to protrude at the lower end of the nozzle. Therefore, an end (end, corner) is formed on the protruding plane. As a result, the excess adhesive that oozes into the plane and propagates through the plane is stopped (restrained) at the end portion, so that it is prevented from being transmitted to the other part of the nozzle and contaminating the nozzle. .
[0028]
  The projected plane 15 has a length (W) of a side in a direction (left-right direction) perpendicular to the filament running direction I at least as long as the diameter (thickness) (D) of the filament. It is possible to deal with lateral vibration (vibration) in the traveling direction of the filamentous body, and it is possible to pass through thread rubbers having different thicknesses. Preferably, the length (L) of the side in the filament running direction I and the length of the side in the direction orthogonal to the filament running direction I (D) with respect to the diameter (thickness) (D) of the filamentous body (D). W) is formed as a rectangular plane having a required amount increased. More specifically, the length of each orthogonal side of the plane 15 is, for example, L = 3D to 6D and W = 1.5D to 3D.
Further, in this configuration, the adhesive discharge port is provided to be opened on the downstream side of the flat filamentous running direction. As a result, the distance between the opening and the slit-shaped guide groove located upstream of the opening in the direction in which the filamentous body travels is further increased, and the adhesive that has not been applied to the filamentous body and has oozed into the plane is Coupled with the fact that the plane portion is pulled and taken away downstream in the traveling direction of the filamentous body by the traveling inertia, the degree of transmission in the slit-shaped guide groove direction is lower, and is transmitted through the guide groove. The phenomenon of descending is more reliably prevented, and the dropping of the adhesive from the nozzle is made less.
[0029]
  the above(2), The filamentous body contactsTravelingThe flat surface to be further moved in the nozzle filament at the lower end of the nozzleDirection orthogonal toIt is formed by projecting by forming recesses on both the left and right sides. As a result, an edge (corner) is formed at the boundary between the projecting plane and the recesses on both left and right ends. As a result, even if the adhesive that has leaked and exuded without being applied to the filaments propagates through the plane, it is prevented from propagating at the edges (corners) on the left and right sides, and further propagates to other parts. Is more reliably prevented.
[0030]
The traveling filament is slightly shaken (vibrated) in the left-right direction on the plane. For this reason, the adhesive that has been blocked and stayed slightly in the plane is taken away by the filament that is slightly swung in the horizontal direction on the plane. This prevents dripping from the nozzle.
[0032]
  the above(3), The slit-like guide groove of the filamentous body is further in contact with the filamentous body.TravelingThe nozzle is movably provided so that the width of the slit-shaped guide groove changes with respect to the height level of the plane. As a result, even if the filaments are different in thickness, that is, are thin or thick, the width of the slit-shaped guide groove can be changed in accordance with the thickness of the filament. In combination with the fact that the portion where the adhesive is discharged and applied is flat as described above and the thread has a clearance, it can be easily applied to the filaments having different thicknesses.
[0033]
Further, even when there is a risk of being caught and cut when the seam portion of the filamentous body passes, cutting can be avoided by changing and adjusting the width of the slit-shaped guide groove to a slightly wider width.
[0034]
the above(4In this configuration, the nozzle further has a blade portion on the downstream side in the traveling direction of the filamentous body in the plane, and the tip is brought to substantially the same level as the level of the plane so that the distal end can come into contact with the traveling filamentous body. It is provided to be positioned. As a result, even if the adhesive remains in the application unnecessary portion of the filamentous body during intermittent application, the residual adhesive is cut and removed at the tip of the blade portion, so that better intermittent application is performed and adhesion is performed. The agent application intermittency is improved.
[0035]
When the valve mechanism of the valve unit V is opened and the adhesive is being discharged from the adhesive discharge port, the filamentous body is slightly lowered (Δh) by the adhesive discharge pressure as shown in FIG. The adhesive is applied to the thread-like body in the depressed state. For this reason, when the valve mechanism is closed, the filament returns to the original projecting plane and comes into contact with it, and the tip of the blade located at the same height (level) as the plane contacts the filament and remains on the filament. The adhesive is cut and removed.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
FIG. 1 to FIG. 11 are views showing an embodiment of an adhesive application nozzle to the filamentous body of the present invention, and FIG. 1 is a longitudinal front view showing the overall configuration of the application nozzle, as seen from the arrows A-A in FIG. FIG. 2 is a left side view of FIG. 1, FIG. 3 is a right side view of FIG. 1, FIG. 4 is a partially enlarged view of FIG. 1, and shows a state of adhesive application to thread rubber, FIG. 6 is a longitudinal cross-sectional front view of the body, taken along line B-B in FIG. 6, FIG. 6 is a side view taken along line C-C in FIG. 5, and FIG. 7 is a side view taken along line D-D in FIG.
[0037]
FIG. 8A is an enlarged view of a portion E in FIG. 6 and shows a vicinity of the protruded plane. FIG. 8B is an enlarged cross-sectional view of the rubber thread shown in FIG. FIG. 9A is a diagram corresponding to FIG. 8A, FIG. 9B is a diagram showing a case where the orifice width is wider than that of FIG. 8A, and FIG. 9B is FIG. FIG. 10 is an enlarged cross-sectional view of the rubber thread shown in (a), showing an adhesive application state, FIG. 10 is an enlarged view of the F part of FIG. 7, showing a projected plane, and FIG. 11 corresponds to FIG. It is a figure shown, and it is a figure which shows the case where it forms with an orifice width | variety wider than FIG.
[0038]
First, the overall configuration of an adhesive application nozzle for thread rubber as a thread-like body will be described with reference to FIGS. The adhesive application nozzle 1 includes a nozzle body 2, a guide plate 3, and a nozzle plate 4, and the bolt 3 a is screwed into the nozzle body 2 upstream of the nozzle body 2 in the traveling direction I of the rubber thread 20. The nozzle plate 4 is integrally connected to the nozzle body 2 by being screwed into the provided screw hole 14, and the nozzle plate 4 is bolted to the nozzle body 2 on the downstream side in the traveling direction I of the rubber thread 20. 4 a is screwed into a screw hole 17 screwed into the nozzle body 2, thereby being integrally coupled to the nozzle body 2.
[0039]
As shown in detail in FIG. 5 to FIG. 7, the nozzle body 2 is formed by scraping off the lower portions on both side surfaces to form slopes and narrowing the lower portions. An end face 10 parallel to the traveling direction I of the thread rubber 20 as a thread-like body is formed at the lower end, and the end face 10 is a direction perpendicular to the traveling direction I of the thread rubber 20 (hereinafter, also referred to as a width direction). ) At a predetermined interval (P₁, P₂, P₃, P₄, P₅) And a plurality of flat surfaces 15 (four in this embodiment) with which the rubber thread 20 comes into contact are formed.
[0040]
The flat surface 15 is formed by scraping off both sides in the width direction of the nozzle body 2 to form recesses (dents) 11 on both sides. Accordingly, the flat surface 15 is formed as a flat surface protruding from the end portion of the nozzle body 2, and edge (corner) portions 10 a are formed at both ends of the flat surface 15 in the direction orthogonal to the traveling direction I. Reference numeral 9 shown in FIG. 8 to FIG. 11 indicates a protruding portion in which the flat surface 15 is formed at the top portion in this way.
[0041]
The flat surface 15 has a length (W) of a side in a direction (left-right direction) perpendicular to the thread rubber traveling direction I at least as long as the diameter (thickness) (D) of the thread rubber 20, and the thread 15 It is possible to cope with a lateral vibration (vibration) in the running direction of the rubber 20 and to allow thread rubbers having different thicknesses to pass therethrough. In this embodiment, with respect to the diameter (thickness) (D) of the thread rubber, the length (L) of the side in the thread rubber traveling direction I and the length (W of the side in the direction orthogonal to the thread rubber traveling direction I) ) Is formed as a rectangular plane having a larger required amount. Note that the lengths of the orthogonal sides of the plane 15 are, for example, L = 3D to 6D and W = 1.5D to 3D.
[0042]
The protrusion 9 formed at the end of the nozzle body 2 as described above has a width W that is a recessed groove at the center of the side surface on the downstream side in the running direction I of the rubber thread.₁An orifice 8 is formed as an adhesive discharge port having the opening 8, and the orifice 8 is opened in the flat surface 15 that is the lower end surface (vertex) of the protrusion 9. The nozzle body 2 is connected to the first adhesive passage (recessed groove) 7 extending in the width direction and the first passage 7 on the inclined surface of the lower portion that becomes the joint surface with the nozzle plate 4. A second adhesive passage (recessed groove) 6 extending upward is formed, and the first passage 7 is connected to an adhesive inflow groove 8 a communicating with the orifice 8.
[0043]
Further, a through hole 5 as a third passage is connected to the second passage 6, and the through hole 5 is bonded to a circular groove formed on a vertical side surface of the nozzle body 2 opposite to the passages 6 and 7. It communicates with the agent supply groove 5a. The first and second passages 7 and 6 become a closed space by the joining plane of the nozzle plate 4 and function as an adhesive passage.
[0044]
The nozzle plate 4 is formed with a blade portion 13 at the lower end portion thereof, and the nozzle plate 4 is formed by bolts 4a so that the knife edge 13a at the front end of the blade portion 13 is at the same level as the flat surface 15. The flat body 15 is fixed to the nozzle body 2 at a downstream position in the running direction I of the rubber thread, and is attached integrally.
[0045]
The guide plate 3 has the same distance (P) as the flat surface 15 of the nozzle body 2 in the width direction of the lower end.₁, P₂, P₃, P₄, P₅) To form a slit-like guide groove 12 for guiding and guiding the rubber thread 20 to the flat surface 15 and the opening position of the orifice 8 of the flat surface 15, and the guide plate 3 is formed of the rubber thread of the flat surface 15. Positioned on the upstream side in the traveling direction I, the vertical position is adjusted so as to have a width slightly larger than the outer diameter of the thread rubber 20 through which the guide groove 12 passes, and the nozzle body 2 is integrally attached to the nozzle body 2 with bolts 3a. It has been.
[0046]
The slit-shaped guide groove 12 is opened at the lower end so that the rubber thread 20 can be inserted, and is formed in a triangular shape having an upper portion at the top, and the width becomes narrower as it goes upward. A bolt hole 19 for attachment to the nozzle body 2 is formed in the guide plate 3 as a long hole extending in the vertical direction, and the guide plate 3 is attached to the nozzle body 2 so that the position in the vertical direction can be adjusted. Therefore, the width of the guide groove 12 can be changed by adjusting the vertical position of the guide plate 3, and can be adapted to the thickness of the rubber thread 20.
[0047]
The adhesive application nozzle 1 configured in this way is integrally attached by inserting a bolt (not shown) into a bolt hole 18 drilled in the nozzle body 2 in a valve unit V having a valve mechanism for stopping the supply of adhesive. The circular adhesive supply groove 5a of the nozzle body 2 communicates with a downstream adhesive passage (not shown) of the valve mechanism. The valve unit V communicates with the upstream adhesive passage of the valve mechanism and is connected to a hot melt melt pressure feeding device (not shown) via a heating hose (not shown).
[0048]
When the valve mechanism of the valve unit V is opened, the adhesive (hot melt) sent by the hot melt melt pumping device is formed in the nozzle body 2 with the adhesive supply groove 5a, the adhesive through hole 5, the second The adhesive flows into the adhesive passage 6 and the first adhesive passage 7, and the adhesive flowing into the first adhesive passage 7 further flows into the respective orifice inflow grooves 8 a and passes through the respective orifices (adhesive discharge ports) 8. It is discharged from a front end opening that is opened downstream in the rubber rubber traveling direction I of the flat surface 15 at the lower end of the nozzle body 2. When the valve mechanism is closed, the discharge of the adhesive from the opening of the orifice 8 is stopped. Therefore, the adhesive can be intermittently applied to the rubber thread 20 by opening and closing the valve mechanism at regular time intervals and discharging the adhesive intermittently (intermittently) from the orifice 8 opening.
[0049]
Next, the operation of the adhesive application nozzle 1 to the rubber thread 20 configured as described above will be described. The traveling rubber thread 20 is guided by the slit-shaped guide groove 12 of the guide plate 3 and is in contact with the flat surface 15 protruding from the nozzle end, and is an adhesive discharge port located on the downstream side of the flat rubber 15 in the rubber rubber traveling direction I. It is guided to the opening of a certain orifice 8. Then, the valve mechanism of the valve unit V is intermittently opened and closed, and the hot melt adhesive HM discharged from the opening of the orifice 8 is intermittently applied to the rubber thread 20.
[0050]
At the time of this intermittent application, as shown in FIG. 4, when the adhesive HM is not applied to the thread rubber 20, the thread rubber 20 travels in contact with the flat surface 15 as indicated by a two-dot chain line, and moves to the thread rubber 20. Is applied to the thread rubber 20 in a state where the thread rubber 20 is pushed down by a very small amount (Δh) by the discharge pressure of the adhesive HM.
[0051]
When the valve mechanism is closed to change from the application state to the non-application state, the rubber thread 20 returns to the original projecting plane 15 as described above and travels in contact with the plane 15 so that the level position (level) is the same as the plane 15. The blade edge 13a, which is the tip of the blade portion 13 of the nozzle plate 4 positioned at (3), contacts the rubber thread 20. For this reason, after the valve mechanism is closed, the adhesive HM remaining in the adhesive passages (5a, 5, 6, 7, etc.) after the valve mechanism flows out and remains on the portions where the thread rubber 20 is not required to be applied. Even if it does, the adhesion adhesive residue will be cut off and removed. For this reason, better intermittent application is performed, and adhesive application intermittency is improved.
[0052]
Since the slit-shaped guide groove 12 of the guide plate 4 is located upstream of the flat surface 15 in the running direction I of the rubber thread 20, it is discharged from the opening of the orifice 8 to the flat part 15 when applied to the rubber thread 20. The excess adhesive that has not been applied to the thread rubber 20 is pulled away by the traveling inertia of the traveling thread rubber 20 to the downstream side in the traveling direction of the thread rubber 20 at the plane 15 portion. For this reason, it is possible to prevent the adhesive from being applied to the slit-shaped guide groove 12 from being transmitted to the slit-shaped guide groove 12 without being transmitted to the slit-shaped guide groove 12. Therefore, the adhesive drops from the nozzle 1 without being lowered.
[0053]
Further, at this time, the orifice 8 is provided not at an intermediate position of the flat surface 15 in the running direction of the rubber thread but on the side surface of the protruding portion 9 on the downstream side of the flat rubber 15 in the running direction of the rubber thread. Since the distance between the opening of the orifice 8 and the slit-shaped guide groove 12 positioned on the upstream side of the opening direction I from the opening is further separated, the adhesive is directed toward the slit-shaped guide groove 12. The transmission is more reliably prevented, the phenomenon of descending through the slit-shaped guide groove 12 is more reliably prevented, and the dropping of the adhesive from the nozzle 1 can be reduced.
[0054]
Further, the nozzle 1 including the flat surface 15 in contact with the thread rubber 20 and the cutting edge 13a of the nozzle plate 4 on the downstream side in the traveling direction I of the rubber thread 20 from the slit-shaped guide groove 12 of the guide plate 3 is A lower end surface is formed, and therefore, below the nozzle 1 including the flat surface 15 through which the orifice 8 opens and the adhesive propagates, the nozzle 1 is continuous with the conventional nozzle 25 as shown in FIGS. There is no path through which the extra adhesive propagates and descends, such as the inner walls 32a and 33a of the slit guide groove 34, and the adhesive does not fall down from the nozzle 1.
[0055]
  Then, the thread rubber traveling direction I of the protruding flat surface 15 with which the rubber thread 20 comes into contact.Direction orthogonal toSince the edge (corner) is formed at the boundary between the left and right ends of the left and right ends of the adhesive, even if the adhesive that leaks and exudes without being applied to the thread rubber 20 propagates through the flat surface 15, Propagation is prevented at the edges (corners) on both sides, and further propagation to other parts is more reliably prevented. In this case, the traveling rubber thread 20 is slightly vibrated in the lateral direction of the traveling direction on the flat surface 15, so that the propagation is prevented from being propagated, and the adhesive slightly staying on the flat surface 15 is left and right on the flat surface 15. It is prevented that the nozzle 1 falls off by being carried away by the rubber thread 20 slightly swung in the direction.
[0056]
Further, the slit-shaped guide groove 12 is arranged so that the guide plate 3 moves vertically with respect to the nozzle 1 so that the width of the triangular slit-shaped guide groove 12 changes with respect to the height level of the flat surface 15 with which the rubber thread 20 contacts. Mounted movably. Accordingly, even when it is desired to apply to a rubber thread having a different thickness, that is, a thin thickness or a thick thickness, the vertical position of the guide plate 3 is changed to reduce the width of the slit-shaped guide groove 12. The application can be performed by changing the thickness according to the thickness of the rubber thread. Further, even when there is a possibility of being caught and cut when a slightly thick joint portion of the thread rubber 20 passes, cutting can be avoided by changing and adjusting the width of the slit-shaped guide groove 12 to a slightly wider width.
[0057]
Further, in the application to the thread rubbers having different thicknesses as described above, since the contact application surface of the thread rubber is the flat surface 15, the thread rubbers having different thicknesses without being restricted by the thickness of the thread rubbers, For example, orifice width W₁Even thread rubber having different thicknesses before and after and having a diameter larger than that of the prescribed thread rubber can cope with a change in the thickness. Further, since the thread rubber has a margin to escape, even if the thick seam of the traveling rubber thread 20 passes through the flat surface 15, it does not break as in the conventional case.
[0058]
On the other hand, FIGS. 8 to 11 are diagrams showing the relationship among the sizes of the rubber thread contact plane 15, the rubber thread 20, and the orifice 8. The width W of the orifice 8 as shown in FIG.₁Is formed to be equal to the thickness (diameter) of the thread rubber 20, as shown in FIG. 8B, the adhesive HM is slightly shorter than the semicircular length in the cross section as shown in FIG. Can be applied. Further, as shown in FIG. 9A or 11, the thickness of the rubber thread 20 is the same, and the width W of the orifice 8 is set.₂Is formed larger than the thickness (diameter) of the rubber thread 20 by a required amount, for example, as shown in FIG. It can apply | coat by (theta) 2.
[0059]
In the present embodiment, for example, for example, the diameter (thickness) (D) of the rubber thread 20 and the width W of the orifice 8 are shown.₁Is the same 0.35 mm, and the protruding plane 15 is a rectangular plane in which the side length (L) in the running direction of the rubber thread 20 is 1.5 mm, and the side length (W) in the direction orthogonal thereto is 0.8 mm. Formed as. The length of each orthogonal side of the plane 15 is selected in the range of L = 3D to 6D and W = 1.5D to 3D, for example.
[0060]
In the above embodiment, the case where the opening of the orifice 8 is provided on the side surface of the protruding portion 9 on the downstream side in the rubber thread traveling direction I of the flat surface 15 is shown. It may be provided at an intermediate position of I or the like.
[0061]
Further, the nozzle 1 is provided with four planes 15 and the nozzle for applying the adhesive to the four thread rubbers 20 is shown. However, the number of the planes 15 is not limited thereto, and the desired number of thread rubbers is shown. The number can be changed according to For example, the number of the flat surfaces 15 may be one, two, three, or five or more depending on the number of desired rubber threads.
[0062]
Moreover, although the case where the thread-like body to be coated is the thread rubber 20 is shown, it is a normal thread, string, and the like, and the cross-sectional shape is not limited to a circle, but an elliptical one, a rectangular one, It may be polygonal.
[0063]
【The invention's effect】
As is clear from the above description, according to the present invention, the following excellent effects can be obtained.
[0064]
According to the configuration of claim 1, the adhesive is prevented from traveling in the direction of the slit-shaped guide groove through the flat portion, and the extra adhesive not applied to the slit-shaped guide groove is not propagated. Accordingly, the adhesive does not descend through the slit-shaped guide groove, and the drop of the adhesive from the nozzle can be reduced.
[0065]
And since the contact surface of a string-like body is made into a plane, even if it is a thread-like body of a different thickness, the thickness of a thread-like body is not restrained, and it can respond to a change in thickness. In addition, since the thread is allowed to escape at the flat portion, there is no fear of being cut even if the thick seam of the traveling thread passes.
[0066]
Also thisWith this configuration, there is no path for the extra adhesive to propagate and descend, such as the inner wall of the slit guide groove of the conventional nozzle that is continuous with the plane, below the plane of the nozzle. It is possible to prevent the falling of the sticker.
[0067]
And againAccording to the configuration, since the end portion (end, corner) is formed in the protruding plane, since the excess adhesive that oozes into the plane and propagates through the plane can be stopped at the end portion, It is prevented that the nozzle is contaminated by being transmitted to other parts of the nozzle.
Further, according to this configuration, the distance between the opening of the orifice and the slit-shaped guide groove located on the upstream side of the opening of the filamentous body from the opening is further separated, and it is not applied to the filamentous body and oozes into the plane. Coupled with the fact that the adhesive is pulled and taken away by the running inertia of the filamentous body at the plane portion downstream in the traveling direction of the filamentous body, the degree of transmission in the slit-shaped guide groove direction is made lower. The phenomenon of descending through the guide groove is more reliably prevented, and there is less dropping of the adhesive from the nozzle.
[0068]
  Claim2According to the above configuration, the edge (corner) is defined at the boundary with the concave portions at the left and right side ends of the projected plane. As a result, even if the adhesive that has leaked and exuded without being applied to the filaments propagates through the plane, it is prevented from propagating at the edges (corners) on the left and right sides, and further propagates to other parts. Is more reliably prevented.
[0070]
  Claim3According to the configuration, even when the thread is different in thickness, that is, the thread is thin or thick, application is performed by changing the width of the slit-shaped guide groove corresponding to the thickness of the thread. In addition, as described above, the portion where the adhesive is discharged and applied is a flat surface, and in combination with the clearance of the filamentous material, it can be easily applied to filamentous materials having different thicknesses. Further, even when there is a risk of being caught and cut when the seam portion of the filamentous body passes, cutting can be avoided by changing and adjusting the width of the slit-shaped guide groove to a slightly wider width.
[0071]
  Claim4According to this configuration, even when the adhesive remains on the application unnecessary portion of the filamentous body at the time of intermittent application, the residual adhesive is cut and removed at the tip of the blade portion, so that better intermittent application is performed. It is possible to improve adhesive application intermittency.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing an overall configuration of an embodiment of a coating nozzle of the present invention, and is a cross-sectional view taken along line AA in FIG.
FIG. 2 is a left side view of FIG.
FIG. 3 is a right side view of FIG. 1;
4 is a partially enlarged view of the lower part of the nozzle in FIG. 1, showing the state of adhesive application to the rubber thread.
5 is a longitudinal front view of the nozzle body, and is a cross-sectional view taken along line B-B in FIG.
6 is a side view taken along the line C-C in FIG. 5;
7 is a view taken along arrows D to D in FIG. 5;
8A is an enlarged view of a portion E in FIG. 6 and shows the vicinity of the projected plane; FIG. 8B is an enlarged cross-sectional view of the rubber thread shown in FIG. It is.
9A is a view corresponding to FIG. 8A, and shows a case where the orifice width is wider than that of FIG. 8A, and FIG. 9B is a view shown in FIG. It is an expanded sectional view of the thread rubber and is a figure which shows an adhesive agent application state.
10 is an enlarged view of a portion F in FIG. 7 and shows a vicinity of a projected plane.
11 is a view corresponding to FIG. 10, and is a view showing a case where the orifice width is wider than that of FIG.
FIG. 12 is a front view (partially sectional view) showing an overall configuration of a conventional adhesive application nozzle.
13 is a left side view of FIG.
14 is a partially enlarged side view taken along the line HH in FIG. 13;
[Explanation of symbols]
1 Adhesive application nozzle
2 Nozzle body
3 Guide plate
4 Nozzle plate
8 Orifice (adhesive discharge port)
9 Protrusion
10 Nozzle end face
11 Recess (dent)
12 Slit guide groove (guide plate)
13 Blade (nozzle plate)
13a cutting edge
15 Projection plane
19 Long hole (guide plate)
20 Thread rubber (filamentous body)
I Travel direction of rubber thread
V Valve unit (Built-in valve mechanism)
L Side length in the direction of running rubber thread
W Side length in the direction perpendicular to the running direction of the rubber thread
W₁, W₂  Orifice width
HM adhesive (hot melt adhesive)

Claims (4)

For guiding the adhesive discharge opening and the yarn-like body for a nozzle for applying adhesive to the filamentous body supplying an adhesive applied to the filaments of the thread rubber or the like running in the adhesive discharge port position In the nozzle for applying the adhesive to the filamentous body having the slit-shaped guide groove, a plane on which the filamentous body contacts and travels is provided at the lower end of the nozzle, and the plane is downstream of the slit-shaped guide groove in the traveling direction of the filamentous body. Forming a lower end surface of the nozzle and projecting at the lower end of the nozzle, and opening the adhesive outlet on the downstream side in the running direction of the flat thread, A filamentous structure characterized in that a slit-like guide groove of a filamentous body is provided on the upstream side in the traveling direction, and an adhesive discharged from the opening of the adhesive discharge port is applied to the filamentous body that travels in contact with the plane. Nozzle application nozzle on the body.   2. The thread-like shape according to claim 1, wherein the flat surface on which the filamentous body is in contact is further formed by forming recesses on the left and right sides of the lower end portion of the nozzle in the direction perpendicular to the nozzle filament traveling direction. Nozzle application nozzle on the body.   The slit-like guide groove of the filamentous body is further provided so as to be movable to the nozzle so that the width of the slit-like guide groove changes with respect to the height level of the plane on which the filamentous body contacts and travels. A nozzle for applying an adhesive to 1 or 2 filaments.   The nozzle is further provided with a blade on the downstream side of the plane in the traveling direction of the filament so that the tip is positioned substantially at the same level as the plane so that the tip can contact the traveling filament. The nozzle for applying an adhesive to the filament according to any one of claims 1 to 3.

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