JP3981232B2 - Powder adhesive spreader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for uniformly dispersing a powder adhesive on a skin material when manufacturing a raising material used for height adjustment of a floor surface of an automobile.
[0002]
[Prior art]
JP-A-9-226430 discloses a raising material used for adjusting the height of a floor surface of an automobile, in which a synthetic resin foam material is used as a core material and a resin felt is used as a skin layer.
When the core material and the skin material are bonded, a water-soluble or solvent-based adhesive or pressure-sensitive adhesive is sprayed from the surface of the skin material moving on the conveyor as shown in FIG.
JP-A-7-52649 uses an adhesive for interior materials such as automobile door trims and instrument panel mats, and JP-A-11-129367 uses a powder adhesive as an adhesive for automobile seat covers. It is disclosed.
As a method for uniformly dispersing the powder adhesive on the skin material, there is a method of placing the powder adhesive on a wire mesh. In this case, since the powder adhesive does not fall from the mesh of the metal mesh due to the crosslinking phenomenon, the powder adhesive is vibrated to break the crosslinking and dropped.
[0003]
[Problems to be solved by the invention]
The water-soluble adhesive is sprayed from the nozzle, so it is difficult to recover and reuse the excess adhesive. After use, the solvent is used to prevent the nozzle from drying and clogging. Need to be cleaned and stored.
In addition, it is difficult to uniformly apply vibration to the entire wire mesh. Furthermore, the particle size of the powder adhesive must be uniform according to the mesh size of the wire mesh. It is necessary to make the mesh of the wire mesh as large as possible. When the amplitude of vibration is large, it is sprayed excessively, resulting in wasteful use of the adhesive, contaminating the work environment with the excess adhesive, Maintenance work had to be done frequently.
[0004]
The present invention can uniformly disperse an appropriate amount of powder adhesive in the production of a car-lifting material for automobiles, and can recover and reuse the excess powder adhesive, which deteriorates the working environment due to the excess adhesive. It is an object of the present invention to provide an adhesive coating apparatus that prevents the maintenance work of the coating apparatus by preventing the above-described problem.
[0005]
[Means for Solving the Invention]
The present invention comprises a transfer means having a gap, a hopper provided at the lower part of the transfer means, and a diffusion tank provided at the upper part of the transfer means and opened at the lower part, and the powder adhesive in the hopper is contained in the diffusion tank by compressed air. Is a powder adhesive spraying device in which an appropriate amount of powder adhesive is evenly sprayed by being spontaneously dropped onto the skin material on the transfer means, and an excess powder adhesive is collected by the hopper.
Further, a booster that sucks the powder adhesive is provided between the suction port of the hopper and the discharge port of the diffusion tank, and compressed air is intermittently sent to the booster.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings. FIG. 1 shows a powder adhesive spreader.
In the transfer means having a gap, the crosspieces 11 are passed at a constant interval in the transverse direction with respect to the traveling direction. When the skin material 7 is placed on the crosspieces, the skin material 7 moves along with the crosspieces 11 at a constant speed. This is a mold conveyor 1.
The upper part of the conveyor 1 is provided with a diffusion tank 3 whose lower part is opened, and the powder adhesive 5 is filled immediately below the diffusion tank across the conveyor, and the excess powder adhesive sprayed from the diffusion tank 3 A cone-shaped hopper 2 from which 5 is collected is provided. As the diffusion tank, a cylindrical shape, a dome shape (a bowl shape), a rectangular shape, or a polygonal column shape can be used.
[0007]
The diameter of the upper part of the hopper 2 is larger than the diameter of the diffusion tank 3 directly above, has a compressed air injection nozzle 21 at the lower part, and has an inlet 22 for the powder adhesive 5 just above the compressed air injection nozzle 21. Yes. The suction port 22 is branched into two by a T-shaped branch pipe, and is connected by pipes 4 to two discharge ports 31 at the front and rear in the traveling direction of the conveyor 1 of the diffusion tank 3. In the figure, it is branched into two and directed to the ceiling of the diffusion tank. Depending on the size and shape of the diffusion tank and the speed of the conveyor, it can be branched into an appropriate number of 3 or more. The direction of the discharge port 31 is appropriately directed to the ceiling, wall, etc. Various arrangements can be made.
[0008]
Further, the powder adhesive 5 in the hopper 2 is mixed with the powder adhesive recovered by dropping, but when the particles of the powder adhesive approach, there is a risk of causing a cross-linking phenomenon and fixing and forming a lump. For this reason, the hopper 2 is provided with an air knocker 23 so as to give a timely impact and destroy the cross-linking phenomenon of the powder adhesive so that the powder adhesive does not adhere.
[0009]
The tube 4 connecting the suction port 22 and the discharge port 31 is provided with a booster 41 for sucking the powder adhesive of the hopper. Compressed air is sprayed from the nozzle 21 to prevent the powder in the pipe of the suction port 22 and the powder near the suction port from becoming agglomerated.
When compressed air is ejected from the booster 41, the downstream side of the booster 41 becomes negative pressure, and the powder adhesive 5 filled in the hopper 2 is sucked into the suction port 22 and sent together with the compressed air, and the discharge port of the diffusion tank 3 It is sequentially discharged from 31 toward the ceiling, collides with the ceiling and the inner wall, is uniformly dispersed and naturally falls, and is evenly spread on the skin material 7.
[0010]
The excess powder adhesive 5 dropped through the gap of the conveyor 1 is dropped and collected in the hopper 2 and reused.
The application amount of the powder adhesive 5 can be adjusted by adjusting the pressure of the compressed air sent to the booster.
It is controlled so that compressed air is intermittently sent to the compressed air injection nozzle 21 and the booster 41 every time the cage conveyor moves a certain distance.
[0011]
【Example】
Example FIG. 2 shows the production process of the raising material, using the powder adhesive spraying device of the present invention, spray hot melt powder on the skin material, and then heat to bond the skin material and the core material, A raised material is obtained by pressure bonding.
A resin felt (600 × 800 mm to 300 × 400 mm) is placed as the skin material 7 on a conveyor of 12 m / min, EVA hot melt powder is used as the powder adhesive 5, and 2 compressed air is supplied from the booster at a pressure of 0.20 Mpa. It is ejected at intervals of seconds, and hot melt powder is uniformly sprayed on the surface of the skin material 7 for 0.4 seconds.
[0012]
Next, the far-infrared heater 6 is used to heat the skin material 7 on which the adhesive has been dispersed at 380 ° C. for 10 seconds to melt the hot melt powder.
A foam core 12 (600 × 400 mm to 300 × 200 mm) is placed on one end of the skin material 7, the other end of the skin material is bent, and is superposed on the surface of the core material. Since the melted hot melt powder has a small heat capacity, it is instantly cooled and the skin material and the core material are bonded. For this reason, a drying process becomes unnecessary and it becomes possible to speed up manufacture of the raising material.
[0013]
The core material and the skin material are uniformly vacuum-bonded at a negative pressure of 50 to 60 cmHg (positive pressure conversion 0.066 to 0.079 MPa) over the entire surface, and the marginal area between the skin material and the core material and the periphery of the skin material is brought into close contact and raised. Get the material.
The time required for these steps was 10 seconds, and the production of the raised material could be speeded up, and no adhesion failure occurred.
[0014]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the deterioration of the working environment by an excess adhesive agent can be reduced, the excess adhesive agent which fell from between the gaps can be collect | recovered and reused, and the maintenance operation | work of a coating device is reduced. Moreover, since an appropriate amount of the adhesive is uniformly applied, there is no adhesion failure. Further, in the production of the raising material, a drying process and a recovery mechanism for excess powder adhesive are not required, so that the work area can be reduced.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a powder spreader of the present invention.
FIG. 2 is a diagram showing a manufacturing process of a raising material.
FIG. 3 is a view showing a conventional adhesive spraying method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conveyor 11 Crosspiece 12 Core material 2 Hopper 21 Compressed air ejection nozzle 22 Suction port 3 Diffusion tank 31 Release port 4 Pipe 41 Booster 5 Powder adhesive 6 Far-infrared heater 7 Skin material

Claims (3)

It consists of a transfer means with a gap, a hopper provided in the lower part of the transfer means, a diffusion tank provided in the upper part of the transfer means and having an open lower part , and a discharge port is provided in the diffusion tank, and powder adhesion in the hopper A powder adhesive spraying device for discharging the agent from the discharge port toward the ceiling of the diffusion tank by compressed air. 2. The powder adhesive spraying device according to claim 1, wherein a booster for sucking the powder adhesive is provided between the suction port of the hopper and the discharge port of the diffusion tank. The powder adhesive spraying device according to claim 2, wherein compressed air is intermittently sent to the booster.

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