JPH0924307A - Spray gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the flow of adhered coating material, to enable thick coating and to reduce overdust by feeding and jetting a main agent consisting of a high viscosity material at high pressure and jetting low pressure air mixed with a curing agent from around the main agent and inside a jetting port. SOLUTION: A curing agent route 12 is provided so as to communicate a curing agent feeding port 13 on the bottom surface of a handle part 14 of a spray gun 11 with a curing agent jetting port 15. A main agent feeding port 21 is installed in the intermediate part of the spray gun 11. A main agent route 22 is formed so as to communicate the main agent feeding port 21 with a main agent jetting port 23 installed in the center of the curing agent jetting port 15. An air combination nozzle is formed of the curing agent jetting port 15 and the main agent jetting port 23. The main agent is fed at high pressure from a main agent gel coat tank 43 by a high pressure pump 41. The curing agent is fed at low pressure from a curing agent tank 44. Since a high viscosity material is atomized and used for gel coat painting or the like, sagging of the coating material after coating is reduced to enable thick coating, allowing working time to be shortened. Since airless atomization is primarily adopted and curing agent-mixed air is at a constant low pressure, overdusting is also reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a spray gun. More specifically, the present invention relates to a spray gun for spraying a gel coat main agent and a curing agent used for gel coat coating of an FRP surface layer.

[0002]

2. Description of the Related Art Conventionally, a spray gun as shown in FIGS. 4 and 5 is used as a spray gun for spraying a gel coat main agent used for gel coat coating of an FRP surface layer and a curing agent for curing the gel coat main agent. Had been used. That is, a nozzle 102 is provided at the tip of the spray gun 101, and the gel coat main agent and the curing agent are separately supplied to the nozzle 102. Therefore, the gel coat main agent is supplied from the supply port 103 to the spray gun 101.
Is supplied to the spray gun 1 through the supply port 104.
01 is supplied. In the nozzle 102, the main agent is sprayed from the center of the tip of the spray gun 101, the hardener is sprayed from around the main agent injection port at the tip of the spray gun 101, and the gel coat main agent and the hardener are mixed outside the injection port.

[0003]

In the conventional example shown in FIG. 4, the main agent is a method in which the main agent is atomized by air, and a low-viscosity material is used to ensure the atomization of the coating agent. That is, for example, the base material was supplied at a supply pressure of 1-2 kg / cm 2 using a viscosity of about 25 cps. The amount of the curing agent mixed with the atomizing air is 3 to 5 kg / cm2.

[0004] However, when a low-viscosity material is used, there is a problem that the paint applied to an object to be coated easily flows and it becomes difficult to make a thick coating. Therefore, there is a problem that the coating time is long. Further, when the atomizing air pressure is adjusted to improve the atomization, the compounding ratio of the curing agent changes, and there is a problem of poor quality. Further, there is a problem that the amount of overdust is large and the mixing ratio of the curing agent on the coated surface is not uniform. Further FIG.
When the high-viscosity main material is atomized at high pressure and the hardener is supplied at low pressure with the conventional air-conditioner combination gun shown in (1), the hardener accumulates in the gap at the rear end of the bushing, causing fluctuations in the hardener mixture ratio and hardener leaking from the cap. And a problem of poor quality.

[0005]

Means for Solving the Problems The present invention provides

[0006] A main agent composed of a high-viscosity material is supplied at a high pressure, is injected from an injection port at the tip, and a low-pressure air mixed with a curing agent is used.
The above-mentioned problem is solved by providing a spray gun characterized by spraying from around the main agent to be sprayed and from the inside of the spray opening.

The operation of the spray gun according to the present invention is as follows. In other words, the main component is made of a high-viscosity material, but is atomized because it is injected at high pressure, and the main agent is injected at high pressure, but the hardener is injected at low pressure, so there is little overdust and the hardener ratio is uniform and the quality is high. Stabilize.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1 showing a central sectional view, FIG. 2 showing a schematic view of the same use state, and FIG. 3 showing an assembly drawing of the same part.

Reference numeral 11 denotes a spray gun. Reference numeral 12 denotes a curing agent path, and 13 denotes a curing agent supply port.
Is communicated from a hardener supply port 13 provided on the bottom of the handle portion 14 of the spray gun 11 to a hardener injection port 15 provided at the tip of the spray gun 11. Reference numeral 21 denotes a main agent supply port, which is provided at an intermediate portion of the spray gun 11. 22
Is the main agent route. The main agent path 22 includes the main agent supply port 21.
Main agent injection port 23 installed at the center of the curing agent injection port 15 from
Communicate with An air conditioning nozzle is formed by the curing agent injection port 15 and the main agent injection port 23. Reference numeral 24 denotes an air conditioner orifice. The air conditioner orifice 24 is provided at the rear of the main agent injection port 23 of the air conditioner nozzle. A bushing 25 supports the air conditioner nozzle 30 via an air orifice 28. A nozzle packing 31 is provided between the air conditioner nozzle 30 and the air conditioner orifice 24. The bushing 25 is connected to the air conditioner orifice 24 and O
Spray gun 1 with cap 29 via ring 27
1 The O-ring 27 may be replaced by a structure in which the bushing 25 side is concave and the air-conditioning bio-orifice 24 side is convex, which is in close contact. Therefore, the problem that the curing agent accumulates in the voids and leaks the curing agent from the gap of the cap 104 as in the conventional example shown in FIG. 5 is solved.

Reference numeral 32 denotes a needle, and 33 denotes a handle. The tip of the needle 32 slides by the operation of the handle 33 to open and close the main agent path 22. The handle 33 simultaneously slides the needle 32 that opens and closes the hardener path 12 to open and close the hardener path 12.

Reference numeral 41 is a high-pressure pump. High pressure pump 4
1 is operated by an air cylinder 42. Reference numeral 43 denotes a base gel coat tank in which the base gel coat is stored. Reference numeral 44 denotes a curing agent tank in which a curing agent is stored.
An injection is formed on the upper part of the hardener tank 44. The main agent gel coat tank 43 is connected to the main agent supply port 21 by a high pressure hose 45. The hardener tank 44 is
The low-pressure hose 46 is connected to the hardener supply port 13.

The main component is composed of an unsaturated polyester styrene monomer, having a high viscosity of 2500 cps,
110 kg / from the main agent supply port 21 by the high pressure pump 41
It is supplied at a high pressure of cm2. The viscosity is 1800 cps-3
The viscosity may be as high as 000 cps, but may be higher depending on the discharge rate and required quality. The pressure is 150k
A high pressure in the range of g / cm 2 may be used. The curing agent consists of methyl ethyl ketone peroxide, 2 kg / cm
2 and is supplied from the curing agent supply port 13 after being fixed at a low pressure.

Next, the operation of the embodiment of the present invention will be described. The main agent made of a high-viscosity material is supplied at high pressure to the main agent supply port 2
1 and is atomized by an air conditioning nozzle, and is sprayed from the main agent spray nozzle 23 at the tip. The hardener is mixed with air by injection installed on the upper part of the hardener tank 44, and the low-pressure air mixed with the hardener is injected from the hardener injection port 15 around the main agent to be injected and inside the injection port.

The main component is made of a high-viscosity material, but is atomized because it is injected at high pressure. The main component is injected at high pressure, but the hardener is injected at a constant low pressure. Quality is stable. As shown in FIG. 2, the tail of the pattern generated by the spraying at a high pressure is treated with the hardener-mixed air to uniform the coating thickness of the object to be coated.

[0015]

EFFECTS OF THE INVENTION Since high viscosity materials are used after being atomized in gel coat coating or the like, the amount of paint dripping after coating is reduced and thick coating is possible, so that the working time is shortened, and a curing agent based on airless atomization is used. Since the mixed air is also at a constant low pressure, there is little overdust and the mixing ratio of the curing agent is uniform. Therefore, it can also be used as a one-liquid airless gun. Further, a large discharge amount is secured.

[Brief description of drawings]

FIG. 1 is a central sectional view showing an embodiment of the present invention.

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

FIG. 3 is a partially assembled view showing an embodiment of the present invention.

FIG. 4 is a central sectional view of a conventional example.

FIG. 5 is a partial cross-sectional view of a conventional example.

[Explanation of symbols]

 23 Main agent injection port

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kenichi Kasashima 4-2-1-15 Nishiterao, Kanagawa-ku, Yokohama, Kanagawa Prefecture Kanako Engineering Co., Ltd.

Claims (1)

[Claims] 1. A main agent comprising a high-viscosity material is supplied at a high pressure and injected from an injection port at a tip, and low-pressure air mixed with a curing agent is injected from around the injected main agent and from the inside of the injection port. Spray gun.