JPS58109167A - Electrostatic flocking method - Google Patents

Abstract

PURPOSE:To carry out electrostatic flocking of a complicate work securely without splitting the flocking by forming a work in a product shape and inverting its recessed part into a projecting part, and inverting it again into the product shape after performing electrostatic flocking of the projecting part. CONSTITUTION:A sheetlike work 1 made of thermoplastic vinyl chloride is formed under a vacuum to form a recessed part 1', which is inverted into a projecting part 1''. This projecting part 1'' is fitted in a projecting type electrode 5 and fixed by clamp plates 6, and the surface of the work 1 is sprayed with an adhesive 8 by a coating gun 7 to from a coating layer 9. Then, a lattice-shaped electrode 10 in a similar shape is arranged over the work 1 and a voltage is applied from a power source 11 to between both electrodes 5 and 10 to generate a line 12 of electrostatic force. Then, pile 14 from a hopper 13 over the electrode 10 is allowed to fall through a sieve 15 to stick into the coating layer 9 at right angles, performing uniform and thick flocking. The flocked part 1'' is inverted into a product shape again to obtain a desired product.

Description

DETAILED DESCRIPTION OF THE INVENTION Disclosed technology 1 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 workpieces to be electrostatically flocked having a complicated shape, such as a console box of a passenger car, which has at least a deep recessed part, without dividing the workpiece 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 an adhesive to the flocked surface of 11 in a series shape, and the falling piles are charged through electrodes and flocked. A flexible workpiece such as a leather product is molded into the shape of a product, the concave part of the hindlimb flock is temporarily reversed and deformed into a convex shape, and the adhesive is applied while maintaining the reversed convex deformation state. The present invention relates to an electrostatic flocking method in which the aforementioned pile is caused to fall and flock along the lines of electrostatic force between the electrodes, and then the inverted convex deformation is reshaped into a concave/concave shape to form a product shape.

As is well known, various industrial products, such as automobile parts and furniture products, require aesthetic design to make them look luxurious, tactility to feel good on the skin, and resistance to scratches on other objects. Various techniques for artificially transplanting hair have been devised from the viewpoints of the above, but it is possible to plant so-called piles of small diameter short fibers as perpendicularly to the grafted surface as possible and densely on average. Electrostatic flocking methods are widely adopted.

However, in conventional electrostatic flocking methods, the lines of electric force between the electrodes tend to intersect perpendicularly to the workpiece's flocking surface. Therefore, it is easy to fall and plant the pile as desired, but for example, when the workpiece has a deep recess such as an automobile console box or a glove box, or a shape that penetrates into the inner surface of the workpiece, The falling pile cannot reliably follow the spreading distribution of electrostatic lines of force, and it is also difficult to apply 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 also has the disadvantage of being cumbersome and inefficient to operate. there were.

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 as appropriate; however, it requires a lot of man-hours and the appearance is poor. Unfortunately, there were also drawbacks such as vibration due to reduced joint strength, decreased durability, and damage to other objects.

The purpose of this invention is to solve the technical problem of electrostatic flocking for a workpiece having four parts based on the above-mentioned prior art, and to reverse the product shape forming workpiece from a concave shape to a convex shape by utilizing the flexibility of the workpiece. Electrostatic flocking is carried out on a series of workpieces,
The purpose of this invention is to provide an excellent electrostatic flocking method that can be useful in the field of electrostatic flocking application in the artificial flocking industry by reducing shake deformation by lowering the curing temperature of the adhesive than that of the workpiece. be.

The structure of the present invention in accordance with the above-mentioned object is to mold a flexible workpiece into a three-dimensional curved surface in the shape of a product in a predetermined mold, and then remove the mold and utilize the flexibility to form a flocked surface having a recessed part. It is reversed and deformed into a convex shape, and while maintaining that state, the adhesive is uniformly applied to the reversed convex deformed flocked surface in the same way as with regular electrostatic flocking, and a predetermined voltage is applied to the electrodes, and the flocking is applied along the lines of electrostatic force. The gist is that the pile is dropped and flocked onto the coated surface of the flocked surface using the usual electrostatic flocking method, and then the flocked inverted convex ridges are pressed in the opposite direction to form a product shape. be.

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 an automobile console box, and as shown in FIG. 1, a thermoplastic PVC sheet work 1 is softened so that it can be plastically deformed by a predetermined heating device 2 such as a far-infrared heater. (for example, 130° to 190°C in the case of PVC), and then placed in a vacuum forming mold 3.

After softening to a predetermined level, the suction holes 4,
4. Air is removed using a vacuum pump from ..., and the workpiece 1 is formed into a product shape 4 using a mold 3, and is usually naturally cooled to about room temperature to solidify. Then, as shown in FIG. 3, the concave part 1' of the workpiece 1 in the product section is inverted and deformed into a convex shape by hand or using an appropriate jig, making use of the flexibility of the material, etc. to form a convex part 1''. to form.

In this case, although the corners 1''' and 1'' are reversed, they do not break as seen in the example of an integral hinge, and the surroundings are also curved, which does not affect the product in any way.

In particular, there is no problem at all if the fabric is folded back in one manufacturing process.

After the reverse convex molding in this way, the convex electrode 5 is fitted as shown in FIG. 4, and then, as shown in FIG. Press and fix the workpiece 1 to the convex electrode 5 using the clamp plate 6.6 as appropriate, and use it as a normal coating gun 7! , p. For example, a urethane emulsion adhesive 8 is uniformly sprayed onto the surface of the workpiece 1 to form a coating layer 9 having a set thickness.

Next, the lattice electrode 10 and the convex electrode 5, which have been previously formed into a shape as similar as possible to the upper part of the workpiece 1, are connected to a stain source 11 (by a lead wire), and a set voltage of, for example, 20 to 300 KV is applied. to form electrostatic lines of force 12.

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

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 for a set time in this manner, the electricity is turned off, the pile is stopped from falling, the electrode 10 and the hopper 13 are moved, and the heating device is re-centred as shown in FIG. 7 to form an adhesive coating layer. 9 is heated and dried, for example, at 70° C. for about 20 minutes.

In this case, since the curing temperature of the adhesive 9 is sufficiently lower than the preheating temperature of the workpiece 1 as described above, there is no deformation, and even if there is, the deformation is extremely small.

Next, as shown in FIG. 8, the flocked molded part 1'' is pressed into the product shape again through the heating softening process of the heating drying described above, reset in the product mold 3, and the suction hole is 4,4...
・Re-shape into a mold by suctioning negative pressure from the mold, cool to room temperature, and solidify.

After demolding, trimming 9 is carried out to fit other parts.

In the case of a console box, after demolding as shown in Figure 9.10.11, trim the 7 lunges and apply adhesive 17 to the outer box 16 of the console box 15 as appropriate.
The inner box 1 of the workpiece is adhesively fixed through the 7 flange of the frame 18 of the console box 15 so as to be attached to a predetermined position.

It should be noted that the embodiments of the present invention are of course not limited to the above-mentioned embodiments; for example, in the process of inverting and deforming the workpiece into a convex shape, the end edge portions may be bent as much as possible, etc. In addition to the console box, the object can also be a glove box or a complex-shaped workpiece having a concave portion 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 simply 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 surface basically has a deep concave part. Electrostatic flocking of complex workpieces can be performed 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 cost and man-hours. The same excellent effects can be achieved.

In addition, since the hair can be implanted onto the workpiece in a single strand, the condition of the flocking on the entire surface can be maintained uniformly and with high precision without any boundaries, the beauty is not compromised, the texture is good, and it prevents damage to objects.
Since there are no seams, there is no rattling and it has the effect of increasing durability.

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 detailed explanatory diagrams of this invention, and Figures 1 to 4 are 1
An explanatory diagram of the process of reversing and protruding the workpiece in the example, FIGS. 5 to 9 are explanatory diagrams of the electrostatic flocking molding process of the workpiece, FIG. 9 is an explanatory cross-sectional diagram of the application of the console box, and FIG. 10 is the diagram of FIG. X
11 is an enlarged cross-sectional view of section X in FIG. 9. 1'... Concavity (product part) 1... Workpiece, 9.
... Adhesive coating film (layer), 5,1o... Electrode, 14
...Pile applicant Toyota Motor Corporation Yomiro Ward 0 II &'s Ward

Claims (1)

[Claims] A flexible workpiece in a method of electrostatically flocking a complex-shaped workpiece having at least a concave part by forming an adhesive coating on the flocked surface of the workpiece while the workpiece is in a continuous state and dropping the pile through an electrode. After molding into the shape of the product, the concave portion is temporarily deformed into an inverted convex shape, the electrostatic flocking is performed while maintaining the inverted convex deformation, and then the inverted convex deformed portion is formed into the product. An electrostatic flocking method characterized by reshaping the flock into its shape.