JPH0747306A - Resin blowing nozzle - Google Patents

Abstract

PURPOSE:To provide a resin blowing nozzle capable of widely and uniformly expanding resin atomization at a short distance. CONSTITUTION:This resin blowing nozzle 100 is provided with a nozzle opening 22 of a resin atomizing nozzle 2 for blowing resin, an annular central jetting opening 4 surrounding the nozzle opening 22 and jetting central air jetting stream for turning the resin jetting stream to the resin atomization, one pair of air jetting openings 5, 6 provided both side thereof and jetting one pair of the air jet streams to flatly expand the resin atomization. The central axis of one of the air jet streams in one pair of the air jetting nozzles 5, 6 is in contact with the upper end part of the resin atomization at a position separated by a prescribed distance from the central air jetting opening 4 and another air jetting stream is in contact with the lower end part of the resin atomization at the prescribed distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin spray nozzle suitable for spraying a resin onto a spray surface having a narrow gap.

[0002]

2. Description of the Related Art In the molding of fiber reinforced plastic (FRP), there is a method in which a dense resin film is first sprayed on the surface of a mold (gel coat) and then FRP is sprayed thereon to obtain a molded product having a smooth surface. The resin spray nozzle for this gel coat has a resin jet outlet that blows out a highly viscous resin in a liquid phase in the center, an annular central air jet outlet surrounding the resin jet outlet, and 2 to 2 on both sides of the central air jet outlet. 3c
It is provided with a pair of left and right air ejection ports formed at intervals of about m. In a conventional resin spray nozzle, resin is made into a cylindrical resin spray by a cylindrical air jet from a central air jet, and the central axes of the jets intersect at the predetermined position of the resin spray from a pair of air jets in the same plane ( A pair of air jets that collide with each other are ejected symmetrically, and the resin spray is spread flat by a collision flow due to the collision of the pair of air jets.

In a conventional gel coating operation using a resin spray nozzle, the resin spray nozzle is set at a position at least 10 cm away from the spray surface of the mold, and the resin spray nozzle is moved in parallel with the spray surface. However, when gel-coating the spray surface in a narrow gap, the nozzle and the spray surface are too close to each other, and it has been difficult to uniformly spread the resin spray with the conventional spray nozzle. Therefore, it was difficult to perform uniform gel coating in a narrow gap having a width of 10 cm or less and a depth of 10 cm or more, such as the inner surface of the straddling portion of a plastic bath. For the gel coat with such a narrow gap, it is necessary to make the resin spray nozzle compact, reduce the distance between the pair of left and right air jets, and increase the crossing angle between the central axes of the pair of air jets.

[0004]

In the conventional resin spray nozzle, if the collision position of the air jets from the pair of left and right air jets is more than 2 cm away from the resin jets, a flat collision flow is stably formed. it can. However, when the collision position is set to a short distance of a few millimeters or less from the resin ejection port or the intersection angle is increased to 90 ° or more, the central axes of the pair of air jets are surely located at the same point on the same plane. Therefore, a stable flat impinging flow cannot be obtained unless it intersects with the center line of the resin spray and the strength of each air jet is not exactly the same. Since it is extremely difficult to intersect the central axes of the pair of air jets and to match the strength of each air jet, the collision flow becomes unstable. As a result, the resin jet cannot be spread stably and flatly, and uniform gel coating is difficult. An object of the present invention is to obtain a resin spray jet that spreads surely even if the distance between the pair of air jets is short or the crossing angle between the central axes of the pair of air jets is increased, and a high viscosity is obtained. Another object of the present invention is to provide a resin spray nozzle capable of spreading the gel coat resin in a wide and uniform manner in a short distance.

[0005]

A resin spray nozzle of the present invention has a resin jet port for jetting a liquid phase resin and an annular shape surrounding the resin jet port, and a resin jet jetted from the resin jet port is made into a resin. A central air jet for ejecting a central air jet for spraying, and a pair of air jets provided on both sides of the central air jet for jetting a pair of air jets for flattening the resin spray. In the resin spray nozzle, the pair of air ejection ports are symmetrically inclined at a predetermined inclination angle in the central air ejection port direction,
It is set so that one air jet contacts the upper edge of the resin spray at a position separated from the resin jet by a predetermined distance, and the other air jet contacts the lower edge of the resin spray at the predetermined distance. It is characterized by having done.

[0006]

In the resin spray nozzle of the present invention, it is not necessary that the axes of the pair of air jets are perfectly aligned, and the central axis of the air jets jetted from the pair of air jets is the jet stream. It is possible to spread the resin spray into a stable flat shape by intersecting the upper end and the lower end of the. Therefore, even if the distance between the pair of air jets is a small nozzle of about several mm, or even if the intersection angle between the central axis of one air jet and the central axis of the other air jet is large, it is possible to ensure The resin spray can be spread flat. As a result, it is possible to uniformly spray the resin onto the spray surface close to the resin spray nozzle.

[0007]

1 to 5 show a resin spray nozzle 100 according to the present invention. The resin spray nozzle 100 covers the nozzle block 1 attached to the tip of the spray gun 200, the resin injection nozzle 2 attached to the center of the tip surface 11 of the nozzle block 1, and the resin injection nozzle 2. The air injection nozzle 3 is fastened to the tip surface 11. The tip portion of the spray gun 200 has a double cylindrical body composed of an inner pipe 201 and an outer pipe 202 to which a liquid phase resin is supplied, and an annular space between the inner pipe 201 and the outer pipe 202 is a compressed air. And a flow path 203 for a small amount of the curing agent. The curing agent may be separately sprayed.

As shown in FIG. 2, the nozzle block 1 has a quadrangular prism shape in which a front end surface 11 is inclined downward (in this embodiment, it is inclined by 30 degrees), and the double portion is formed from a rear end to a central portion. A connection hole 12 into which the tip of the barrel is inserted is formed. The rear end of the connection hole 12 is a large-diameter portion through the step 13, the tip of the outer pipe 202 abuts on the step 13, and the tip of the inner pipe 201 penetrates the connection hole 12 and passes through the tip surface 11. Has reached. A cylindrical fitting seat 14 into which the resin injection nozzle 2 is fitted at the center is formed concentrically with the end surface of the connecting hole 12 on the tip end surface 11 for fastening the air injection nozzle 3 at the upper left corner and the lower right corner. Screw holes 15, 1
5 are provided.

The resin injection nozzle 2 has a columnar shape, an axial conical portion 22 is projectingly provided on a tip end surface thereof, and a cylindrical nozzle port 22 is projectingly provided at a tip end of the conical portion 21. An inclined hole 23 (inclined by 30 degrees) into which the tip of the inner pipe 201 is inserted is formed in the rear end face, and communicates with the nozzle port 22. Four air holes 24 are axially formed in the outer periphery of the resin injection nozzle 21. The air injection nozzle 3 has a rectangular plate shape, the back surface 31 is a contact surface with the tip end surface 11, and a cylindrical air chamber 32 covering the resin injection nozzle 2 is formed at the center. At the center of the air chamber 32, a central air ejection port 4 which is annularly formed by coaxially inserting the nozzle port 22 is opened. Through holes 34, 34 for fastening are provided at both opposite corners of the air injection nozzle 3.

On the front wall of the air jet nozzle 3, projections 50 and 60 are formed symmetrically with the central air jet port 4 interposed therebetween. Inner side surfaces 51 and 61 of the projections 50 and 60 are inclined surfaces of 30 degrees, and a pair of left and right air injection ports 5 and 6 are orthogonal to the inner side surfaces 51 and 61 and communicate with the air chamber 32. ing. With respect to the vertical position of the pair of air jets 5, 6, the pair of left and right air jets is located substantially at the upper edge of the central air jet 4, and the pair of left and right air jets 5, 6 is formed.
Is set to be located at the lower end of the central air outlet 4. Further, the central axes of the pair of air injection ports 5 and 6 are apart by 3 mm in the vertical direction, and intersect at an intersection angle α = 120 degrees.

The operation of the resin spray nozzle 100 will be described with reference to FIG. The liquid phase resin supplied from the resin supply source to the inner pipe 201 is jetted as a resin jet A from the nozzle port 22. The high-pressure air and a small amount of the curing agent supplied to the flow path 203 from the high-pressure air source and the curing agent supply means enter the air chamber 30 through the four air holes 24, and the annular central air jet from the central air injection port 4. B is ejected as B, and air jets C and D are ejected from the pair of left and right air ejection ports 5 and 6. The resin jet A is atomized by the central air jet B to become a resin spray E. The resin spray E is at a position at a predetermined distance L from the nozzle port 22 (L = 4 mm in this embodiment), and is different from the air jets C and D. , The central axis of the jet flow is parallel planes with a vertical distance of 3 mm,
They intersect at an intersection angle α = 120 degrees. The air jet C
The central axes of and D do not necessarily have to be on parallel planes.

The central axis of the air jet C contacts the upper edge of the resin spray E, and the central axis of the air jet D contacts the lower edge of the resin spray E. As a result, the resin spray E becomes the air jets C and D.
Receives a shearing force to form a resin spray F that spreads flat in the horizontal direction. The positional relationship between the upper and lower edges of the resin spray E and the centers of the air jets C and D is stable and flat if the central axes are in contact with the upper and lower edges of the resin spray E at substantially the same position. It becomes the resin spray F that spreads over. The larger the crossing angle α is, the wider the flat resin spray F spreads, and therefore the resin spraying nozzle 100 can approach the spraying surface. However, when it greatly exceeds 120 degrees, the resin spraying F becomes unstable. Therefore, the range of the intersection angle α = 120 ° ± 10 ° is optimal. When the crossing angle α is 120 degrees, the resin spray nozzle 10 has a diameter of about 3 cm.
Even if the tip of 0 is brought close to the spray surface, the resin spread over a width of about 100 mm can be sprayed uniformly.

[Brief description of drawings]

FIG. 1 is a sectional view of a tip portion of a spray gun with a resin spray nozzle according to the present invention.

FIG. 2 is a cross-sectional view and a front end view of a nozzle block.

FIG. 3 is a sectional view, a front end view, and a rear end view of a resin nozzle.

FIG. 4 is a sectional view, a front end view, and a perspective view of an air nozzle.

FIG. 5 is a perspective view showing a spread structure of a resin jet.

[Explanation of symbols]

 1 Nozzle Block 2 Resin Jet Nozzle 3 Air Jet Nozzle 4 Central Air Jet 5, 6 Air Jet 100 Resin Jet Nozzle 200 Spray Gun A Resin Jet B Central Air Jet C Air Jet D Air Jet E Resin Spray F Resin Spray

Claims (2)

[Claims] 1. A central air ejecting a liquid jetting resin, and a central air jet having a circular ring shape surrounding the resin jetting for making the resin jet blown from the resin jetting into a resin spray. A resin spray nozzle comprising a jet port and a pair of air jet ports provided on both sides of the central air jet port and jetting a pair of air jets for flattening the resin spray, wherein the pair of air jet ports are provided. Is symmetrically inclined at a predetermined inclination angle in the direction of the central air jet, and one air jet comes into contact with the upper edge of the resin spray at a position separated from the resin jet by a predetermined distance, The nozzle for spraying resin is characterized in that the air jet is set so as to contact the lower edge of the resin spray at the predetermined distance. 2. The resin spray nozzle according to claim 1, wherein an intersecting angle between the central axis of the one air jet and the central axis of the other air jet is 120 ° ± 10 °.