JPS61161157A - Coating nozzle - Google Patents

Abstract

PURPOSE:To prevent the generation of a tail mark at both end parts and of fly mist at one end part by providing a slotted groove on the front surface of an airless fan-pattern nozzle obliquely to the axial center of the lower hole, and forming the slotted groove whose both sides have convergent V-shaped cross sections. CONSTITUTION:The nozzle is appropriately used for coating mainly the periphery having large area when wooden articles such as furniture are manufactured. The lower hole 3 whose front terminal part 2 is an elliptical cone is provided to the nozzle tip body 1 of an airless fan-pattern nozzle, and a slotted groove 4 whose both sides have circular arc-shaped and convergent V-shaped cross sections is furnished to the front surface part of the nozzle tip body 1. Besides, the slotted groove 4 crosses the lower hole 3 obliquely, one side which crosses shallowly is aligned almost with the boundary between the terminal part 2 and the straight part of the lower hole 3 and the deep side crosses the straight part of the lower hole 3 comparatively deeply. Accordingly, the flying of mist at one terminal part of the fan pattern and the generation of a tail mark at both terminal parts are prevented.

Description

Detailed Description of the Invention (Technical Field) This invention provides a method for applying adhesives to the periphery of a wide area, for example, when manufacturing wood products such as furniture, or when manufacturing paper surfaces for packaging. This invention relates to a coating nozzle that is convenient for coating.

(Background technology) Adhesive application can range from manual application using a brush or roller to
Application is being switched to automatic machines. For application over a large area, it may be possible to use a fan-pattern sprayer that ejects a fan-shaped mist, and we have found that an airless sprayer is better. However, the commonly used airless fan pattern spray nozzle has the disadvantage that fine mist is scattered over a wide area. Further, when applying a highly viscous adhesive, there is a drawback that tail marks are generated at both ends. Therefore, when applying adhesive with emphasis on the periphery of a wide area (see Figures 6 and 7), the mist will scatter outside the periphery of the object A, and If the spray position is moved inward to prevent this, there is a problem that the coating on the edges of the object will be incomplete.

(Objective of the present invention) The present invention provides an application nozzle for a spray set that can provide a fan pattern that does not generate tail marks at both ends, and that generates almost no scattered mist at one end. This is an invention aimed at.

(Structure of the present invention) In the coating nozzle of the present invention, the slotted groove facing the front of the airless fan pattern nozzle is provided obliquely to the axis of the pilot hole, and both sides of the slotted groove are circular arcs. It is formed in a slotted groove with a tapered V-shaped cross section.

(Embodiments of the present invention) An embodiment of the present invention shown in the attached drawings will be described below. The nozzle tip body is a seven-type fan pattern nozzle with a nozzle tip body indicated by reference numeral 1 in the drawings, and the nozzle tip body 1 includes: The front end portion 2 is provided with an elliptical conical pilot hole 3 formed in an elliptical dome shape, and the nozzle tip body 1
A slotted groove 4 having a tapered V-shaped cross section with arc-shaped both sides (a tapered V-shaped cross-section with both sides curved) is carved in the front part of the , intersects the pilot hole 6 diagonally, and the extent of the intersection is particularly shallow, with one side almost matching the boundary between the terminal part 2 and the straight part of the pilot hole 5, and the other side with a deeper intersection. intersects the straight line portion of the pilot hole 3 relatively deeply, and therefore, an obliquely oriented oval nozzle opening 5 is opened by the intersection of the pilot hole and the slotted groove 4.

When using the above fan pattern nozzle to spray a liquid such as adhesive at a pressure of around 9/d from a distance of several centimeters, tail marks will occur on both ends of the fan pattern. Furthermore, at one end of the fan pattern where the slotted groove 4 was shallow, a lopsided fan pattern spray was obtained in which no mist scattering was observed. (See Figure 4) Therefore, it is suitable for applying adhesive that focuses on the periphery of a wide area. (See Figures 6 and 7) The embodiments shown in Figures 4 and 5 are configured to form an air curtain around the airless fan pattern, which prevents the fine mist from scattering and The structure is such that the mark is also suppressed, that is, the nozzle tip body 1 is press-fitted into the tip of the support body B, and the front end of the support body 6 protrudes obliquely in the same way as the inclination of the nozzle opening 5 of the nozzle tip body 1. It is formed into a horseshoe shape, and an air passage 7 is provided in the large diameter portion at the rear. An air nozzle body 8 is fitted on the outer periphery of the support body 6, and a horseshoe-shaped nozzle opening 9 is formed diagonally at the front end of the air nozzle body 8 in the same way as the front end of the support body 6. A horseshoe-shaped annular air nozzle opening is formed between the front end portion and the front end portion of the air nozzle body 8, and air of 9/7 or less in number is supplied from the rear air passage 7, and the above-mentioned 7.
7/ Form an air curtain that surrounds the pattern spray diagonally in front of the air nozzle opening.

If the front end of the support body 6 protrudes beyond the front end of the air nozzle body 8, the adhesive liquid adhering to the front surface of the support body 6 will fall without contacting the air nozzle body 8, resulting in the problem of adhering to the air nozzle and being blown forward. can be avoided.

Note that the shape of the pilot hole 3 of the nozzle tip body 1 is a four-sided pyramid,
It may be conical. However, a pyramid with rounded corners,
It was found that the isosceles hexagonal pyramid with rounded corners and the elliptical cone caused less mist to scatter. In the case of a pyramid, the end portion 2 needs to have a rounded edge. In addition, the surface to be coated during spraying should not be installed perpendicular to the nozzle axis, but should be placed in the slotted groove 4.
It has been found that it is possible to install it in an inclined state so that the shallow end of the

(Effects of the Present Invention) (1) Since the slotted grooves 4 are provided obliquely, scattering of mist at one end of the fan pattern is suppressed.

(2) Since the degree of intersection of the shallower side of the slot groove 4 almost coincides with the boundary between the straight part of the pilot hole 3 and the terminal part 2, it is effective in preventing tail marks. Since the shape of the groove 4 is a tapered V-shaped cross section with an arc or a square shape on both sides, it is extremely effective in preventing tail marks.

(4) Due to the mutual effect of the shape of the slotted grooves 4 and the degree of shallow intersection, no tail marks occur even when spraying from a short distance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of the nozzle of the present invention, FIG. 2 is a front view,
FIG. 6 is a cross-sectional plan view, FIG. 4 is a vertical cross-sectional side view of the embodiment combined with an air nozzle, FIG. 5 is a front view of the same, and FIGS. 6 and 7 are front views of the object to be coated in a coating state. . 1: Nozzle tip body, 2: Terminal part, 6: Prepared hole, 4: Slit groove, 5: Nozzle opening, 6: Support body, 7: Air passage, 8:
Air nozzle body, 9: Nozzle mouth, A: Object to be coated

Claims (1)

[Claims] In a dispensing nozzle that sprays liquid in a fan pattern, the nozzle tip body is provided with a pilot hole having a conical or dome-shaped end with a radius, and the front side of the nozzle tip body has circular arcs on both sides. A slotted groove with a tapered V-shaped cross section is carved, and the slotted groove intersects the pilot hole diagonally, and the shallower the intersection, the more the straight part of the pilot hole. The coating nozzle almost coincides with the boundary with the terminal part, and the other deep part intersects relatively deeply with the straight part of the pilot hole.