JPS6320188B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The disclosed technology belongs to the technical field of densely planting short fibers in resin parts, etc. Accordingly, the invention of this application causes short fiber piles of a predetermined length stored in a pile dropping device of an electrostatic flocking device to fall toward a workpiece, and in the process of falling, passes through a mesh-like or slit-like high-voltage electrode. This invention relates to an electrostatic flocking method in which flocking is carried out by electrostatic attraction to a workpiece placed on a base, and the flocking is erected on the coating film on the surface of the workpiece to form a densely planted state. This invention relates to an electrostatic flocking method in which a forced airflow is caused to flow downwardly at multiple locations simultaneously or regularly in accordance with the falling speed of the pile, thereby making the falling distribution of the pile uniform. . <Prior art> As is well known, about 1.5% has been applied to resin parts of automobiles, such as interior parts, from the viewpoints of improving appearance, appearance, flexibility, and tactility.
An electrostatic flocking method has been developed in which short, mm-long thin fibers are electrically charged, attracted to a grounded workpiece, and pierced through an adhesive layer applied to the surface of the workpiece, creating a densely planted pattern. Among these methods, the flocking method called the down method is widely used because it involves gravity falling of the short fiber pile and electrostatic attraction, and various types have been put into practical use after various improvements. . <Problems to be Solved by the Invention> However, the piles that collectively fall from the sieve of the falling device produce a downward airflow in the flocking chamber with the surrounding air, and the downdraft also Gives variation to the flow of the pile. That is, as shown in FIG. 1, the pile 3 stored on the sieve 2 of the electrostatic flocking device 1 falls and flows through the high-voltage electrode network 4, becoming charged and bonding to the adhesive layer on the surface of the grounded work 5. 6 and gets a hair transplant, but
As described above, the circulating airflow A is generated near the wall of the flocking tank, and the pile group 3 is concentrated in the center or in the area where the amount of fall is large, and as a result, the area where there is a small amount of fall falls on thin hair areas of the workpiece. This has the disadvantage that an excessive amount of pile accumulates in areas where there is a large amount of hair, causing a so-called hair fall phenomenon. The purpose of the invention of this application is to solve the problems of electrostatic flocking based on the above-mentioned prior art, and
An excellent electrostatic flocking method that ensures uniform pile distribution in the flocking chamber and evenly flocks the piles on the surface of the workpiece, which is beneficial to the application of molding technology in the interior industry. This is what we intend to provide. <Means and operations for solving the problems> In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned claims, is to solve the above-mentioned problems. Forced airflow is applied to the entire area simultaneously or regularly or irregularly in parallel along the pile falling area at a speed that matches the falling speed of the pile, and the pile falling from the falling device is placed in the flocking room. The particles fall with an average distribution without a bias distribution, or the bias drawn by the downward airflow changes direction alternately or sequentially, resulting in an average distribution over time, and as a result, it is planted on the work surface. The pile is evenly densely planted, and technical measures have been taken to prevent hair thinning and hair falling. <Example> Next, an example of the invention of this application will be described below with reference to the drawings from FIG. 2 onwards. still,
Components having the same features as those in FIG. 1 will be described using the same reference numerals. In the embodiment shown in FIGS. 2 and 3, 1' is an electrostatic flocking device, and a vibrating sieve 2 connected to a vibrating device (not shown) is provided in the upper part of the casing to accommodate piles 3 of a set size. The workpiece 5 to be flocked is placed on a set plate 7 which is lowered and grounded and has an adhesive layer 6 thereon. A mesh type high voltage electrode 4 connected to a high voltage power source 8 is disposed between the vibrating sieve 2 and the set plate 7. Accordingly, in the invention of this application, blow-off pipes 10, 10... each having a large number of nozzles 9, 9... opened downward are provided on the inner frame of the casing of the electrostatic flocking device 1 via a bracket (not shown).
Each of the blowout pipes 10, 10... is a flow rate regulating valve 1.
1. Compressed air source 13 with solenoid valve 12 interposed in series
It is connected to the. When flocking with the electrostatic flocking device 1, the pile 3 is stored in the vibrating sieve 2, the high-voltage electrode 4 is energized to open the electromagnetic valves 12, 12, and the flow rate regulating valves 11, 11... are adjusted. Forced air flow B is applied so that the air flow from the nozzles 9, 9... of the blow-off pipes 10, 10... is adjusted to match the falling speed of the pile 3 from 0.1 to 1.0 m/sec, and the blow-off flows are parallel to each other.
cause When the vibrating sieve 2 is set in this way and the pile 3 is caused to fall, the forced airflow B is falling downward at the same speed as the falling speed of the pile 3, so it is attracted to the downward airflow side. The particles fall while maintaining a uniform distribution in parallel without being concentrated in the center, pass through the high-voltage electrode 4, and are charged.
It is attracted to the workpiece 5, pierces the adhesive layer 6, and is planted with an average density over the entire surface. Therefore, the state of the planted pile 3 is free from thinning and falling hairs, and electrostatic flocking with high product precision as designed can be obtained. According to the experiment, as shown in Table 1 below, in the conventional case, the fall distribution is dense in the center and coarse around the periphery, but in the case of the invention of this application, as shown in Table 2, the fall distribution is relatively small. A uniform drop distribution was obtained. (However, in Tables 1 and 2, the numerical values indicate a rectangular falling cross section, and the total falling amount is expressed as 50.)

【table】

[Table] Next, in the embodiment shown in Figures 4 to 6b, the electrostatic flocking device 1'' is a rotary sieve 2', but in the case of the electrostatic flocking device 1 of this type, the As shown in the figure, since the drum of the rotary sieve 2 is long in the axial direction, the falling amount Q of the pile 3 is distributed approximately evenly in the axial direction Ap, but in the radial direction Rp. There is a tendency to concentrate in the center, and as mentioned earlier, there is a risk that areas with a small amount of distribution will have thin hair and areas with a large amount of distribution will have hair fall. A frame inside the casing of the electrostatic flocking device 1' is connected to the blow-off pipes 10, 10, . Fix it to each outlet pipe 1
A large number of nozzles 9, 9, . . . are drilled oriented perpendicularly to 0, 10, . Each of the solenoid valves 12, 12... is connected to a control device 15 having a timer 14, so that each solenoid valve 12, 12... is opened one by one at a set time, for example, every 10 seconds. ing. Depending on the settings, it is also possible to open two at a time, and the opening operation time can also be changed, and each blowout pipe 10, 10... can be made to blow out irregularly. When electrostatic flocking is performed using this device, the flow rate adjustment valves 11, 11, etc. are adjusted to generate a forced downward airflow that matches the falling speed of the pile.
The rotary sieve 2' is rotated to drop the pile 3. Then, the control device 15 sequentially opens each electromagnetic valve 12, 12, . Therefore, each blow-off pipe 10, 10... operates in sequence, and compressed air is ejected downward from its nozzle 9, 9..., thereby causing the pile 3 falling from the rotary sieve 2' to be biased toward the downward airflow C side. It descends, passes through the high-voltage electrode 4, is charged, is attracted to the earthwork 5, and pierces the surface adhesive layer 6 thereof. However, as mentioned above, each blowout pipe 10,
10... are activated one by one via the solenoid valves 12, 12..., so the forced airflow C is generated alternately on the sides and also alternately at the ends, so the falling pile 3 is generated each time. The forced airflow is biased toward the C side and descends, and as a result, over time, it descends with an average distribution over the entire area, and for work 5, hair transplantation is performed with an average distribution, and similarly thin hair, No hair falling phenomenon occurs. According to experiments, the axial position of the rotating sieve 2'
The distribution of the pile amount Q over time of Ap is shown in Fig. 6a, and the distribution of the radial position Rp is shown in Fig. 6b, which is extremely superior to the conventional distribution shown in Figs. 5a and 5b. It turned out that It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments; for example, various embodiments can be adopted, such as being applicable to a rotary grooved roll type electrostatic flocking method. . <Effects of the Invention> As described above, according to the invention of this application, by basically blowing out forced airflow from the side of the pile dropping device along the pile falling direction at the same speed as the falling speed of the pile, The pile is guided by forced airflow and falls in an average manner without being concentrated in the center.Therefore, there is no thinning or falling of hair in some places, and products with high precision are produced as designed. Excellent effects can be achieved. In addition, by operating the blowoff pipes installed around the pile dropping device regularly or irregularly to generate forced airflow at the same speed as the falling speed of the pile, the pile is forced to the forced airflow side. It is possible to make the product fall biased and eventually achieve an average drop distribution, resulting in an excellent effect of improving product accuracy. Therefore, in order to avoid thinning areas, it required a large equipment investment and a large amount of space, but now it is more compact.
It has excellent effects such as requiring only the required amount of pile.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view explaining the electrostatic flocking mode based on the prior art, FIG. 2 and the following are explanatory views of embodiments of the invention of this application, FIG. 4 is a schematic cross-sectional view of another embodiment, 5a and 5b are graphs illustrating the axial and radial distribution of the conventional pile falling amount of the rotary sieve, and 6a, Figure 6b is 5a and 5b.
FIG. 4 is an explanatory graph diagram of the embodiment. 1, 1'...Pile dropping device, 3...Pile, 4...
High voltage electrode, 5... Workpiece, 6... Flocked surface (adhesive layer), B, C... Forced air flow.

Claims (1)

[Claims] 1. In an electrostatic flocking method in which a group of piles is dropped from a pile dropping device, passed through a high-voltage electrode to be charged, and then planted upright on the flocked surface of the workpiece, from the side of the pile dropping device. An electrostatic flocking method characterized in that a forced airflow is generated downward matching the falling speed of the pile. 2. In an electrostatic flocking method in which a group of piles is dropped from a pile dropping device, passed through a high-voltage electrode to be charged, and then planted upright on the flocked surface of the workpiece, forced airflow is directed downward from the side of the pile dropping device. 1. An electrostatic hair flocking method characterized in that the forced airflow is generated at a plurality of generation sites with a temporal difference in time.