JP2014069095A - Resin application nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin application nozzle for ensuring a reliable resin application while preventing a loss in a cycle time and avoiding the complexity in structure and the enlargement in size thereby to prevent occurrence of failures such as sagging or cobwebbing of resin, in a case of applying a resin such as an adhesive reliably to an applied object such as fabric.SOLUTION: A nozzle end 11 for discharging a resin is formed with a plurality of discharge holes 16 for separating the discharged resin into a plurality of discharge flows. Between the mutually adjacent discharge holes 16, there are formed banking portions 17 for blocking the confluence of the resin flows discharged from the discharge holes 16.

Description

  The present invention relates to a resin application nozzle that can be suitably used when a resin such as a thermoplastic resin is applied to a cloth.

In joining fabrics, a method of bonding with an adhesive instead of sewing may be employed. A thermoplastic resin can be used for the adhesive used for this adhesion.
By the way, when the resin which is a highly viscous fluid (paste-like) is discharged from the application nozzle toward the application target, the resin is not cut well when the discharge is stopped, and as a result, the application nozzle is separated from the application target. At this time, it is well known that the resin causes stringing between the coating nozzle and the coating object. Such stringing is inconvenient in terms of the appearance and quality of the object to be coated. Further, when the discharge stop time becomes long, there is a problem that the resin gradually leaks from the application nozzle and droops.

  As a technique for avoiding the problem of stringing or sagging, a configuration in which a complicated valve structure is built in a coating nozzle has been proposed (see Patent Document 1, etc.). Further, as a method for avoiding the problem of stringing, a method (see Patent Document 2) in which the application nozzle is rapidly separated from the application target has been proposed.

JP-A-6-246212 JP 7-108205 A

  In the case where an adhesive is applied to the cloth, there are many cases where application is performed while drawing a plurality of corners, curves, or dotted points in one application operation (one cycle operation). In such a coating operation, when the coating method disclosed in Patent Document 2 is adopted, every time the resin discharge from the coating nozzle is stopped, such as when the direction of the coating is changed, the coating nozzle is suddenly separated, and then the coating target There is a drawback that it is necessary to perform a special operation such as approaching an object, and the cycle time becomes long.

In addition, the coating nozzle disclosed in Patent Document 1 has a complicated structure and has a problem in manufacturing cost, and there is also a problem that causes an increase in the size of the entire coating apparatus due to an increase in size. In addition, since the pipe line resistance in the nozzle becomes excessive, there is also a drawback that resin clogging occurs.
The present invention has been made in view of the above circumstances, and when applying a resin such as an adhesive to an application target such as a cloth, the loss of cycle time is prevented, and the structure is complicated and large. It is an object of the present invention to provide a resin application nozzle that enables reliable resin application while preventing occurrence of problems such as resin dripping and stringing.

In order to achieve the above object, the present invention has taken the following measures.
That is, the resin application nozzle according to the present invention is characterized in that a plurality of discharge holes for separating the resin to be discharged into a plurality of discharge flows are provided at the nozzle end for discharging the resin.
At the nozzle end, a damming portion for preventing the resin immediately after discharge from joining from the discharge hole is provided between the discharge holes adjacent to each other.

  The damming portion is formed with a straight passage that rectifies so that the resin supplied toward the discharge holes becomes a rod flow having a straight component immediately before being discharged from the individual discharge holes.

  In the resin application nozzle according to the present invention, when a resin such as an adhesive is applied to an object to be applied such as a fabric, the cycle time is prevented from being lost and the structure is not complicated or enlarged. Thus, reliable resin application can be performed while preventing problems such as resin dripping and stringing.

It is the sectional side view which showed 1st Embodiment of the coating nozzle which concerns on this invention. It is the top view (figure corresponding to the bottom view of Drawing 1) showing a 1st embodiment of an application nozzle concerning the present invention. It is the sectional side view which showed the usage example in 1st Embodiment of the coating nozzle which concerns on this invention. It is the sectional side view which showed 2nd Embodiment of the coating nozzle which concerns on this invention. It is the top view which showed 3rd Embodiment of the coating nozzle which concerns on this invention. It is side sectional drawing which showed the comparative nozzle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of a coating nozzle 1 according to the present invention. In the coating head 2 illustrated in FIG. 3, the coating nozzle 1 is attached to the discharge-side front end portion (lower end position in FIG. 3) of the resin supply path 3. By moving the application head 2 while keeping the same distance from the application object, the resin can be applied to the application object in a linear form (including a corner with a corner or a curved curve) or a dotted form. . Naturally, it is also possible to obtain a planar application state by repeating linear application without any gaps.

  In this embodiment, the object to be applied is a cloth, and a thermoplastic resin (used as an adhesive) suitable for bonding the cloth is used as the resin to be applied. For this reason, the coating head 2 is formed of a material having excellent heat conductivity such as a metal material, and the heater 4 is provided so as to surround the resin supply path 3. Therefore, by causing the heater 4 to generate heat, the resin in the resin supply path 3 is heated and maintained in a molten state (a state in which the viscosity is lowered until it is pasty and can flow). Naturally, the melted resin is discharged through the application nozzle 1 and immediately becomes cured when cooled.

  The application nozzle 1 has an attachment base 10 used for attachment to the application head 2 and a nozzle end 11 provided on the attachment base 10. As shown in FIG. 2, in the first embodiment, the mounting base 10 has a disk shape, a nozzle end 11 is disposed at the center position of the mounting base 10, and the nozzle end 11 is formed on one side of the mounting base 10. It was assumed to be provided in a circular boss shape protruding to the side.

Therefore, the mounting base 10 is sandwiched and fixed between the coating head 2 by a perforated cover cap 12 screwed to the coating head 2, and at this time, from the central port 13 provided in the cover cap 12. The nozzle end 11 protrudes outside the cover.
In the coating nozzle 1 according to the present invention, the nozzle end 11 is provided with a discharge hole 16 for discharging the resin supplied by the resin supply path 3 of the coating head 2. A plurality of discharge holes 16 are provided so as to be accommodated in a circle formed by the nozzle end 11, and the adjacent discharge holes 16 are not in communication with each other. In other words, each of the discharge holes 16 is an independent hole, and it can be said that a damming portion 17 is provided between the discharge holes 16 adjacent to each other.

  In the case of a conventional application nozzle, only one discharge hole having a diameter equal to or slightly smaller than the diameter of the nozzle end is provided, and the required resin application amount is provided by this one discharge hole. In addition, the width of the line is set to be ensured when a linear coating is performed. On the other hand, in the present invention, the plurality of discharge holes 16 provided in the nozzle end 11 ensure the required resin coating amount and the line width when performing linear coating.

  Since the plurality of discharge holes 16 are provided in the nozzle end 11 in this way, the resin flow supplied to the application nozzle 1 through the resin supply path 3 of the application head 2 is discharged from the application nozzle 1. Are separated (divided) into a plurality of discharge flows. That is, the sum total of the contact areas with the inner peripheral surface of the hole generated when the resin passes through each discharge hole 16 is increased as compared with the conventional case, or within the individual discharge holes 16 having a smaller diameter than the conventional case. Along with the increasing relationship between the resin density and the resin viscosity, the discharge resistance of the resin discharged from the application nozzle 1 as a whole (the total of the pipe resistances by the discharge holes 16) increases.

Therefore, when stopping the discharge (application) of the resin and separating the application nozzle 1 from the object to be applied, the resin before application in each discharge hole 16 has already adhered to the object to be applied (resin after application) Even if it is likely to be pulled out from each discharge hole 16 by the adhesive force, the pipe line resistance by each discharge hole 16 acts to surely cut the resin that is likely to be pulled out.
Here, the fact that the resin discharge flow from each discharge hole 16 is narrowed by the diversion also acts to promote (make it easy to cut) the resin that is about to be drawn. For these reasons, the stringing phenomenon is reliably prevented from occurring between the application nozzle 1 and the application object. In addition, as the pipe line resistance due to each discharge hole 16 is increased, naturally, the resin is prevented from leaking from each discharge hole 16 while the resin discharge is stopped, which also prevents dripping. Connected.

The damming portion 17 not only has the function of partitioning the individual discharge holes 16 into independent holes (an effect of diverting the resin discharge flow), but substantially depends on each discharge hole 16. It is important to increase the pipe resistance and thereby increase the discharge resistance of the resin discharged from the coating nozzle 1 as a whole.
Further, the damming portion 17 does not join the resin discharged from the individual discharge holes 16 (including on the way to the coating object and after adhering) immediately after the discharge (between the opening peripheral portions on the outlet side of the discharge holes 16). In this case, it is important to secure a sufficient space so that the resins discharged from the adjacent discharge holes 16 are not in contact with or close to the damming portion 17.

Therefore, it is not impossible to form the individual meshes as the discharge holes 16 by forming the nozzle end 11 with, for example, a mesh material (mesh material), but in this case, the damming portion 17 is configured. The thickness of the mesh line is required to be thick to some extent.
Specifically, the damming portion 17 is preferably a space that can secure 0.2 mm or more between the ejection holes 16 and the adjacent ones of the ejection holes 16. Nevertheless, the resin viscosity, discharge pressure, discharge speed (flow rate), the outer diameter of the nozzle end 11 (total area of the discharge holes 16), the inner diameter of the discharge holes 16, the number of holes of the discharge holes 16, etc. The space of the damming portion 17 to be generated between the discharge holes 16 can vary depending on various factors.

On the other hand, as shown in FIG. 1, the discharge hole 16 is formed to have a certain length along the hole axis (hole depth). The straight passage 18 is formed by making the damming portion 17 thicker in the resin supply direction.
By providing such a straight path 18, when the resin passes through the discharge hole 16, the resin is rectified so as to become a rod flow (a resin flow that goes straight at a distance equal to or larger than the hole diameter of the discharge hole 16). Is done. Thus, since resin becomes a stick flow and has straightness, it leads to the effect | action that the resin flow immediately after discharge from the discharge hole 16 becomes difficult to mutually merge. As a result, the action of prompting (easy to cut) the resin that is likely to be pulled out from the discharge hole 16 is obtained, and the effect of preventing the stringing phenomenon between the coating nozzle 1 and the coating object is further enhanced. . In addition, since the straight line passage 18 also has the effect of increasing the pipe resistance, the effect of preventing the resin from leaking (dripping) from the respective discharge holes 16 while the discharge of the resin is stopped is further enhanced.

  In addition, there is nothing that can be clearly distinguished between the straight passage 18 and the discharge hole 16 in terms of shape and action. As a specific example for reference, it is preferable to set the length including the straight passage 18 and the discharge hole 16 to a length exceeding twice the hole diameter of the discharge hole 16. . Further, it is preferable that the straight passage 18 be in the same direction as the resin supply direction and the discharge direction.

However, the straight passage 18 can also vary depending on various factors such as the viscosity, discharge pressure, discharge speed (flow rate) of the resin, the inner diameter of the discharge holes 16 and the number of holes. In short, the length including the straight path 18 and the discharge hole 16 may be set on condition that the resin passing through these passages becomes a rod flow.
In addition, various advantages such as stabilization of the discharge pressure, prevention of running out of the resin during discharge, and straight delivery of the resin can be obtained by making the resin into a rod flow.

In the first embodiment, the nozzle end 11 has the same diameter as the resin supply path 3 and the matching communication so that the resin from the resin supply path 3 of the coating head 2 flows into each discharge hole 16 stably. A recessed resin reservoir 20 is provided.
As described above in detail, in the application nozzle 1 according to the present invention, when applying a resin such as an adhesive to an application target such as a cloth, the application (application) of the resin is stopped and the application nozzle 1 is applied. Even when the object is separated from the object, the pipe resistance due to each discharge hole 16 reliably cuts the resin that is likely to be drawn out and prevents the occurrence of stringing. Moreover, since the pipe line resistance by each discharge hole 16 is high, it is also prevented that resin leaks from each discharge hole 16 during the stop of resin discharge, and dripping is also prevented.

  For this reason, every time the resin discharge is stopped, it is not necessary to cause the coating nozzle to perform special operations such as rapid separation and subsequent approach, and the cycle time does not become long (highly efficient resin application work). Yes). The application nozzle 1 has a simple structure and does not require a complicated valve structure. Therefore, the manufacturing cost is low and there is no problem of increasing the size. From these things, reliable resin application can be performed.

By the way, the present applicant manufactured a comparative nozzle T as shown in FIG. 6 and performed a resin application test. In this comparative nozzle T, a counterbore (downward concave portion) Z surrounding the openings of the adjacent discharge holes 16t is formed on the outlet peripheral portion of the discharge hole 16t at the nozzle end 11t. .
According to this comparative nozzle T, the resin discharged from each discharge hole 16t accumulated in the counterbore Z, and as a result, the resin flow from the discharge hole 16t merged. Therefore, in this comparative nozzle T, the resin that is likely to be pulled out from the counterbore Z at the time of application of the resin cannot be cut, and a stringing phenomenon has occurred between the comparative nozzle T and the object to be applied. . Further, the resin leaked (dripped) from the counterbore Z while the resin discharge was stopped.

  Therefore, in the present invention, when the discharge resistance of the coating nozzle 1 is increased, the discharge resistance of the coating nozzle 1 is not simply increased, but a plurality of discharge flows are generated at the time of discharge from the coating nozzle 1. It can be said that it is important to separate (split) the resin flow, that is, to provide the discharge holes 16 so that the resin immediately after the discharge does not join each discharge hole 16.

FIG. 4 is a second embodiment of the application nozzle 1 according to the present invention. In the coating nozzle 1 of the second embodiment, the straight passage 18 is omitted with respect to each discharge hole 16. By omitting the straight passage 18, the resin reservoir 20 is formed deep in the resin supply direction.
Since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given to those having the same functions, and detailed description thereof is omitted.

FIG. 5 shows a third embodiment of the application nozzle 1 according to the present invention. The coating nozzle 1 of the third embodiment is provided with a central discharge hole 16A having a relatively large inner diameter and an outer edge discharge hole 16B having a relatively small inner diameter with respect to the nozzle end 11. Thus, various patterns can be adopted for the hole diameter, the number of holes, and the hole arrangement of the discharge holes 16.
Since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given to those having the same functions, and detailed description thereof is omitted.

The present invention is not limited to the above-described embodiments, and can be appropriately changed according to the embodiments.
For example, the material of the fabric as the application target is not limited at all, and may be a natural material or a synthetic fiber material, and may be a nonwoven fabric or felt depending on the case. The fabric may be knitted or woven. Furthermore, the object to be applied is not limited to cloth, but may be paper, resin film, hard resin, metal, or the like.

As the resin, it is possible to employ a resin having a low viscosity that can flow even at room temperature.
The attachment structure to the coating head 2 including the presence or absence of the attachment base 10 is not limited at all.
The straight path 18 may be a straight hole having a constant inner diameter, or may be a tapered hole having a large diameter on the upstream side in the resin supply direction and a small diameter on the downstream side (discharge hole 16). In addition, a structure in which the opening peripheral portion of the discharge hole 16 is chamfered with respect to the straight passage 18 may be adopted.

DESCRIPTION OF SYMBOLS 1 Coating nozzle 2 Coating head 3 Resin supply path 4 Heater 10 Mounting base 11 Nozzle end 12 Cover cap 13 Central port 16 Discharge hole 16A Central discharge hole 16B Outer edge discharge hole 17 Damping part 18 Straight path 20 Resin pool T Comparative nozzle

Claims (3)

  A resin coating nozzle, wherein a nozzle end for discharging resin is provided with a plurality of discharge holes for separating the discharged resin into a plurality of discharge flows.   2. The resin according to claim 1, wherein a damming portion is provided between the discharge holes adjacent to each other at the nozzle end to prevent the resin immediately after discharge from joining from the discharge holes. Application nozzle.   The damming portion is formed with a straight passage that rectifies so that the resin supplied toward the discharge holes becomes a rod flow having a straight component immediately before being discharged from each discharge hole. The resin coating nozzle according to claim 2.

Images