JPH0255108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the field of electrostatic flocking technology for the inner surface of products having recesses, such as box-shaped products.

Therefore, the present invention is capable of processing a complex-shaped work to be electrostatically flocked, such as a console box of a passenger car, which has at least a deep recess, without dividing the work into a plurality of simple-shaped pieces.
This invention relates to an electrostatic flocking method in which a flocking coating film is formed by applying adhesive to the flocked surface of the flocked piles in a continuous shape, and the fallen piles are charged through electrodes and flocked. Once a flexible workpiece such as a product is formed into a product shape,
After that, the concave part of the flocked part is temporarily reversed to be deformed into a convex shape, and while maintaining the reversed convex deformation state, an adhesive is applied, and the pile is caused to fall and flock along the electrostatic force lines between the electrodes, and then This invention relates to an electrostatic flocking method in which the inverted convex deformation is reversely reshaped into concave and concave shapes to form a product shape.

As is well known, various industrial products, such as automobile parts and furniture products, are required to have aesthetic design, such as making them look luxurious, and tactility, such as feeling good on the skin.
Various techniques for artificially transplanting hair have been devised from the viewpoint of preventing damage to other objects, etc. The electrostatic flocking method is widely used because it allows dense planting.

However, in conventional electrostatic flocking methods, when the workpiece has a planar shape or an average uneven shape, the lines of electric force between the electrodes tend to intersect perpendicularly to the workpiece's flocked surface. Therefore, it is easy to fall down and plant the pile as desired, but if the workpiece has a deep recess, such as an automobile console box or a club box, or a shape that penetrates into the inner surface, static electricity may occur. The falling pile cannot reliably follow the spreading distribution of the lines of force,
Furthermore, it is difficult to apply the adhesive to every corner on average, resulting in uneven flocking and poor precision.

To deal with this, it is possible to manufacture special coating guns and electrodes, but this has the disadvantage of being complicated and expensive along with the jig, and has the disadvantage of being cumbersome and inefficient to operate. .

It is also possible to divide the complex workpiece into multiple pieces with the shape of the flocked surface as smooth as possible, electrostatically flock them individually, and then join them together as appropriate, but this requires a lot of man-hours and the appearance is poor. However, if the strength of the seam decreases, it may vibrate, its durability may deteriorate, or it may cause damage to other objects.

The purpose of this invention is to solve the technical problem of electrostatic flocking for workpieces having concave portions based on the above-mentioned prior art, and to reverse the product shape forming workpiece from concave to convex by utilizing the flexibility of the workpiece. Electrostatic flocking is carried out in a continuous state on the workpiece, and the curing temperature of the adhesive is lower than that of the workpiece, so that deformation of the workpiece is minimized. Excellent electrostatic flocking that can benefit the field of electrostatic flocking application in the artificial flocking industry. The purpose is to provide a hair transplantation method.

The structure of the present invention in accordance with the above-mentioned purpose is to mold a flexible workpiece into a three-dimensional curved surface using a predetermined mold, and then remove the mold and utilize the flexibility to invert the flocked surface having a concave portion. This state is maintained, and the adhesive is uniformly applied to the convex and deformed flocked surface in the same way as normal electrostatic flocking, and a predetermined voltage is applied to the electrodes to form a pile along the lines of electrostatic force. The gist of this method is to drop the fibers onto the coating film on the surface to be flocked using a normal electrostatic flocking method, and then push the flocked reversal protrusions backwards to form a product shape. .

Next, embodiments of the present invention will be described below with reference to the drawings.

The embodiment is a mode in which electrostatic flocking is performed on the inner box of a console box of an automobile, and as shown in FIG. Heat until softened (for example, 130° for PVC)
(up to 190℃) and place it in vacuum mold 3.

After softening to a predetermined level, air is removed from the suction holes 4, 4, etc. using a vacuum pump as shown in FIG.
It is usually molded into a shape and then naturally cooled to about room temperature to solidify.

After the molding is completed, the mold is removed, and as shown in Figure 3, by hand or by making use of the flexibility of the material.
Using an appropriate jig, the concave portion 1' of the workpiece 1 of the product section is inverted and deformed into a convex shape to form a convex portion 1''.

In this case, although the corners 1 and 1' are reversed, they do not break as in the example of an integral hinge, and the surroundings are also curved, so that there is no effect on the product.

In particular, there is no problem at all when folding in one manufacturing process.

In this way, after the reverse convex molding, the convex electrode 5 is fitted as shown in FIG. 4, and then, as shown in FIG. Convex electrode 5 with appropriate clamp plates 6, 6
Hold the workpiece 1 in place and use the normal coating gun 7.
For example, the urethane emulsion adhesive 8 is uniformly spray-coated onto the surface of the workpiece 1 to form a coating film 9 having a set thickness.

Next, the lattice electrode 10 and the convex electrode 5, which have been preformed in a similar shape as much as possible on the upper part of the workpiece 1, are connected to the power source 11 by lead wires.
Electrostatic lines of force 12 are formed by applying a set voltage of 300 KV.

Then, the pile 14 stored in the hopper 13 installed above the electrode 10 is dropped from the sieve 15 and rushes along the electrostatic force lines 12 so as to be perpendicular to the coating layer 9 of the workpiece 1 as much as possible. The hair is implanted evenly and densely by piercing the hair.

In this case, the convex mold 5 may be of a type that does not function as an electrode, and the electrode may be provided separately.

After flocking in this manner for a set time, the electricity is turned off to stop the pile from falling, the electrode 10 and hopper 13 are moved, and the heating device is reset as shown in FIG. For example, heat and dry at 70°C for about 20 minutes.

In this case, the curing temperature of the adhesive 9 is the same as that of the workpiece 1.
As mentioned above, it is sufficiently lower than the preheating temperature of
There is no deformation, and even if it does, it is extremely slight.

Next, as shown in FIG.
Contrary to the above, it is pressed into the product shape again through the heat softening of the heat drying described above and reset in the product mold 3, and is re-shaped according to the mold by suctioning negative pressure from the suction holes 4, 4, etc., and then heated to room temperature. Cool to solidify.

After demolding, it is trimmed or shaped to fit other parts.

For console boxes, 9th, 10th, 1st
As shown in Fig. 1, after demolding, the flange portion is trimmed, and the inner box 1 of the workpiece is adhesively fixed to the outer box 16 of the console box 15 with an appropriate adhesive 17, and then attached to the flange of the frame 18 of the console box 15. Make sure to install it in place.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments, and various embodiments may be employed, such as bending and squeezing the edges as much as possible in the process of inverting and deforming the workpiece into a convex shape. In addition to console boxes, the present invention can also be applied to grab boxes and complex-shaped workpieces with recesses such as furniture.

As described above, according to the present invention, when electrostatically flocking a flexible material workpiece having a complicated shape having at least a concave portion in a continuous state, the workpiece is once formed into a product shape and then inverted into a convex shape. By deforming the surface to expose the flocked surface in a convex shape, applying adhesive to the exposed convexity, electrostatically flocking, and then inverting and re-pressing the flocked surface, it is possible to basically create complex workpieces with deep concave parts. Electrostatic flocking can be carried out reliably, and since there is no need to divide the flock into multiple pieces, the electrodes and coating guns can be used even if they are of the normal electrostatic flocking style, reducing both cost and man-hours. The same excellent effects are produced.

In addition, since the hair can be grafted onto the workpiece as a continuous line, the condition of the flocking on the entire surface can be uniformly maintained with high precision without any boundaries, the beauty is not impaired, the texture is good, it does not prevent scratches on objects, and there are no seams. Therefore, there is no rattling and the durability is increased.

Furthermore, since the workpiece can be turned over through its flexibility, there is no risk of damage to the workpiece during the turning process.

Furthermore, since the curing temperature of the adhesive is generally lower than the preheating and softening temperature of the workpiece, there are excellent effects such as no risk of deformation of the workpiece.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of embodiments of this invention, and the first
Figures 4 to 4 are explanatory diagrams of the process of reversing and protruding the workpiece in one embodiment, Figures 5 to 9 are diagrams explanatory of the electrostatic flocking forming process of the same workpiece, Figure 9 is a cross-sectional diagram of the application of the console box, and Figure 10 is Figure 9 - Sectional diagram, 1st
FIG. 1 is an explanatory enlarged cross-sectional view of section XI in FIG. 9. 1'... recess (product part), 1... workpiece, 9... adhesive coating film (layer), 5, 10... electrode, 14... pile.

Claims (1)

[Claims] 1. A method of electrostatic flocking in which an adhesive film is formed on the flocked surface of a complex-shaped workpiece having at least a concave portion while the workpiece remains in a continuous state, and the pile falls through an electrode. Once the workpiece has been formed into a product shape, the concave portion is temporarily deformed into an inverted convex shape, the electrostatic flocking described above is performed while the inverted convex deformation is maintained, and then the inverted convex deformed portion is An electrostatic flocking method characterized by reshaping and reshaping the product shape.