KR830001301B1 - Internal coating method of cylindrical shaped glass articles with bottom - Google Patents

Abstract

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Description

Internal coating method of cylindrical shaped glass articles with bottom

1 is a partial cross-sectional side view of an essential part showing an example of an inner surface coating apparatus for carrying out the method of the present invention.

2 (a)-(g) are process explanatory diagrams showing an embodiment of the present invention.

3 is a sectional view showing an example of a glass grove for a lighting fixture coated by the method of the present invention.

The present invention relates to an inner coating method which enables to coat the inner surface of a cylindrical glass molded article having a bottom such as a glass grove cosmetic bottle for a lighting fixture, a vase and various other glass containers with a uniform coating film.

Conventionally, the spray coating method using a spray nozzle is known as a coating method of a glass molded article. In this method, however, the outer surface of the glass molded article is relatively well painted. However, when the outer surface is coated in this way, characteristics such as glossiness of the glass surface are lost, and in particular, it is not suitable for the glass grout for luminaires that emphasize the decorative property.

In addition, when coating the inner surface of a glass molded article, the characteristics such as glossiness of the glass surface are not lost. However, in the conventional spray coating method, since the spray direction of the table is determined, the coating is easily stained, and it is very difficult to uniform the coating film. There are some things that are bad, such as being trapped in a mist and falling later on the coating, causing irregular spots.

Particularly, in the case of a glass grove for a lighting fixture, light sources such as a light bulb are inserted therein to transmit light, and therefore, the glass grove for a lighting fixture strictly requires uniformity of coating than that of a general glass product.

An object of the present invention can be efficiently coated with a uniform coating on the inner surface of the glass molded article by a simple method, and to increase the decorative effect without losing the characteristics such as the gloss of the glass surface and to produce a product with high product value at low cost. To figure out.

A feature of the present invention is to inject a predetermined amount of paint into the inside of the glass molded article in the shape of a cylindrical shape, and to rotate the molded article upside down while rotating the molded article while turning the electrical paint on the inner side of the molded article. The coating is closed and the opening is closed with a lid before the opening of the molded article is viewed downward, and then the excess paint inside the molded article is sucked out and taken out.

The features of the present invention will become apparent from the examples shown below.

The inner coating method according to the present invention is carried out using an inner coating apparatus as shown in FIG. 1, and the outline of the apparatus will be described next.

In Fig. 1, the revolving shaft 2 is rotatably supported in a horizontal posture with the bearing 11 on the fixed frame 1.

One end of the biaxial shaft 2 is connected to the drive shaft 22 of the motor 21 for revolution, and the other end is connected to the electric power 23 and the balance kit 24. The rotor 23 is rotatably supported by the bearing 25 in a position in which the rotating shaft 3 intersects with the nominal shaft 2, and one end of the rotating shaft 3 is connected to the driving shaft of the magnetic motor 31. The other end is connected to the chuck 4. As a result, the chuck 4 is able to rotate as if it is rotated up and down about the rotation axis 3 and rotates up and down about the rotation axis 2.

The chuck 4 has a recess 41 for holding a cylindrical glass molded article (hereinafter referred to as a driven object) 8 having a bottom, such as a glass grove for an luminaire to be painted internally by an air chuck, and at the bottom of the recess 41. The made hole 42 communicates with the hole 32 made in the rotating shaft 3 and the circumferential groove 33, and in turn communicates with the hole 27 installed in the member 26. A vacuum pump is connected with a flexible hose or the like, so that the coated object 8 fitted to the fluctuation part 41 can be attracted and held by depressurizing the electric recess part 41 with the same pump. The electrical member 26 is fixed to the collector 23. The paint injection nozzle 5 is freely supported by the fixed frame 12 and lifted up and down by an air cylinder (which may be a hydraulic cylinder) out of the picture. This nozzle 5 is connected to the paint tank by a flexible hose and a valve outside the figure.

The lid 7 is made to be movable in the axial direction and to be changeable in the position corresponding to the rotation axis of the chuck 4 in the transverse direction at the same position. That is, the air cylinder (which may be a hydraulic cylinder) 6 and the guide cylinder 62 are attached to the base plate 61 attached to the collector 23, and the rod 64 is attached to the rod 63 of the cylinder 6. The pin 65 protruding from the rod 64 into the spiral groove 66 made in the guide tube 62, and the base plate of the lid 7 with the attachment hole 67 at the tip of the rod 64. (71) was attached. The lid 7 is rotatably supported by the member 72 attached to the base plate 71 and slidably in the axial direction, and is urged to elastically press the stopper 73 with a compression spring outside the picture. have. The lid 7 has a hole 74 for recovering excess paint, the hole 74 communicates with the hole 75 in the member 72, and the hole 75 is painted with a flexible hose and a vacuum pump outside the picture. Communicating with the recovery tank.

The stopper 73 is attached to the tip of the pipe 79 and the pipe 76 communicates with the air introduction hole 77 made in the base plate 71.

Next, the inner surface coating method and the process which concern on this invention using the said inner surface coating apparatus are demonstrated by FIG.2 (a)-(g).

(I) First, the object to be coated 8 is held upward at its opening 81 and held by the chuck 4 (see Fig. 2 (a)).

At this time, the nozzle 5 is moved upwards so as not to disturb the cell 8 to be evacuated, the lid 7 is moved upward, and the center of the workpiece 8 is the center of the chuck 4. 3) the center (left to match the C ₁₎ depressurizing the hole 27 around the groove 33, the hole 32, the recess 41 through the hole 42 to a vacuum pump outside the picture and P of Figure stolen goods (8 ) Is adsorbed and held.

(II) The nozzle 5 is lowered and inserted into the workpiece 8, and a predetermined amount of the table W is injected into the workpiece 8 (see FIG. 2 (b)).

Injection of the paint W is performed by valve operation, and flows naturally through the nozzle 5 in the paint tank made above the fixed frame 12 or by using a pump pressure.

At this time, in order to prevent the paint W from scattering, it is preferable to inject the gap S between the end of the nozzle 5 and the bottom inner surface of the object to be coated 8 as small as possible. The interval S is determined according to the viscosity and the injection amount of the paint W, and the injection amount is determined by the coating area and the coating film thickness of the object to be coated 8. Alternatively, during the injection, first, the tip of the nozzle 5 may be brought close to the bottom inner surface of the object to be coated 8 and the paint W may be injected while gradually raising the nozzle 5.

In general, the paint (W) is injected while the coated object (8) is rotated around the center (C ₁ ) by the motor 31, the rotating shaft (3), and the chuck (4). After the injection to some extent or after completion of the injection, the coating 8 may be rotated.

(III) The nozzle 5 is raised, taken out of the object 8 and set aside upwards (see FIG. 2 (c)).

At this time, the object to be coated 8 rotates at a predetermined rotational speed V ₁ about the center C ₁ . This rotating speed V ₁ is determined according to the viscosity of the paint W, the coating area of the inner surface of the object to be coated 8, and the like. If the rotating speed (V ₁ ) is increased, the coating material (W) injected into the coating object (8) is gradually applied along the inner surface of the coating material (8) by centrifugal force and can be coated by the so-called centrifugal coating method. Since the painting 8 is turned upside down, it is not necessary to rotate it at a high speed so that a large centrifugal force is applied.

(IV) The workpiece 8 is then idled (turned) at a predetermined idle speed V ₂ in a predetermined direction (clockwise in the drawing) centering on the center C ₂ (FIG. d) reference)

The idle is driven by a revolving motor 21 through a revolving shaft, a solid body 23, a rotating shaft 3, a chuck 4 and the like. At this idle time, the nozzle 5 moves upward and stops, so that the nozzle 5 does not interfere with the turning of the object 8.

(V) During the idle, the opening 81 of the object 8 is closed with the lid 7 (see FIG. 1C).

At the time of idle, the lid 7 also struggles integrally with the current collector 23 and the like, and guides the pin 65 and the spiral groove 66 while inserting the rod 64 while operating the cylinder 6 during the idle. Rotational position, thereby rotating the lid 7 while inserting the lid 7 to a position opposite the opening 81 of the workpiece 8 and interlocking the rod 64 with the opening 81. In close contact with the opening 81.

110°)까지 공전할때까지 뚜껑(7)으로 개구부(81)를 폐쇄하도록 셋한다. 또 이 폐색상태에 있어서, 부재(72) 및 마개(73)는 베이스판(71)과 일체로 회전하지 않으며, 뚜껑(7)은 피도장물(8)과 일체로 부재(72)의 주위를 회전한다. 이로서 피도장물(8) 내의 잉여도료가 외부로 누설되는 것을 방지한다.At this time, the object to be coated (8) in the upward position angle θ (θ

Set opening 81 to close with lid 7 until idle (110 °). In this closed state, the member 72 and the stopper 73 do not rotate integrally with the base plate 71, and the lid 7 integrally with the object to be coated 8 circumscribes the member 72 around. Rotate This prevents the excess paint in the to-be-coated 8 to leak out.

(VI) As described above, the opening 81 of the object to be coated 8 is closed with the lid 7 and continuously idle as it is, and the opening 81 is completely upward, and then the second The revolution is stopped at a time of 180 ° idle in the postures of FIGS. But rotating continues (see Figure 2 (f)).

In this way, the coating 8 can be evenly applied to the entire inner surface of the coating 8 by rotating the coated object 8 by 180 ° and inverting it up and down.

On the other hand, when the opening 81 is closed with the lid 7 in the above step (V), the hole 74 is opened, and the vacuum pump connected to the hole 75 by a flexible hose is operated before and after each other and the hole ( The inside of the to-be-coated object 8 is pressure-reduced by gradually introducing air into the to-be-coated object 8 through the pipe 76 in 77). In this state, in the process of (VI), the paint 8 is inverted up and down, and the surplus paint in the paint 8 is introduced into the hole 74 and sucked with a vacuum pump to actively discharge to the outside. Recover to the recovery tank. This minimizes the waste of the paint and makes the coating film applied to the inner surface of the coated object 8 uniform without leaving the paint remaining in the corner of the coated object 8 or the paint flowing near the opening.

When the excess paint is suctioned and discharged, air is slowly introduced into the water to be coated by the air introduction hole 77 and the pipe 76, so that the inside of the coated material 8 is decompressed more than necessary, and the coating film becomes thinner or less. The coating 8 can be prevented from being accidentally broken, and at the same time, the coating film can be firstly dried inside the coating 8, and the following drying time can be significantly shortened.

(Iii) The excess paint is removed in the process of (VI), and then the rotation of the chuck 4 (ie, the workpiece 8) is stopped and the lid 7 is separated from the workpiece 8 (the 2 degrees (g)).

At this time, by operating the cylinder (6) to advance the rod, while separating the lid (7) from the workpiece (8) and at the same time guide the pin 65 and the spiral groove 66 of the workpiece (8) Rotate and displace to a position away from the center C ₁ .

Then, when the coated object 8 is removed from the chuck 4, the coated object (product) is coated when the coated object 8 is coated with a coating film 82 having a uniform film thickness (t) without coating stain as shown in FIG. I can make it.

Thus, the workpiece 8 is removed from the chuck 4, and then the chuck 4 or the like is orbited about the center C ₂ , and returned to its original position, that is, the position of FIG. The new coating object is set again in 4) and the above steps (I)-(iii) are repeated.

By the way, in the present invention, the shape, dimensions, uses, etc. of the object to be coated 8 are not particularly limited, and can be used for the inner coating of lighting utensils, cosmetic bottles, vases, and all other containers.

In addition, this to-be-coated object 8 is generally made of transparent glass, but may be made of semitransparent glass suitably colored.

Coating on the inner surface of the translucent glass can further enhance the very colorful decorative effect by combining the color of the object itself and the color of the coating film. Organic or inorganic may be used for the paint (W). In particular, when painting on the inner surface of a glass grove, the inorganic paint is considered in consideration of light transmittance and weather resistance due to the insertion of a light source such as a light bulb into the glass to penetrate the coating film. It is good to use In addition, the component, viscosity, and film thickness t of the coating film 81 of this coating material W can be arbitrarily determined according to the use of the to-be-painted object 8, color, light transmittance, and other desires.

In addition, in the inner surface coating apparatus for carrying out the method of the present invention, the shape dimension of the chuck 4 is determined depending on the shape of the object to be coated 8 and the rolling method, or as a structure for holding the object to be coated 8. The chuck may be a mechanical or hydraulic chuck using not only an air chuck but also a plurality of opening and closing chucks.

The nozzles 5 may be of a multi-type having a plurality of outlets with a small diameter as well as a general shape having only one outlet.

In the inner coating device, a cleaning device for the lid 7 is installed together, and the lid 7 is separated from the object to be coated 8 in the above process, and then the paint attached to the inner surface of the lid 7 is washed. You may also do it. The cleaning device may be a rotary wiper or an absorbent rotary sponge.

In the above embodiment, the case where the coated object is to be coated one by one has also been described.

For example, (but not shown) the revolving shaft is elongated, the middle part is formed into a cylindrical shape, and the angular cylindrical axis is longitudinally spaced at a certain distance in the longitudinal direction to support a plurality of rotating shafts with rotational chucks. At the same time, each shaft is connected to a single motor by a belt drive. On the other hand, a plurality of nozzles corresponding to each chuck is attached to the lifting frame and supported by lifting materials with a hydraulic cylinder or the like for the fixed frame. In addition, a plurality of lids corresponding to each chuck are attached to the lifting frame, and the lifting frame is supported on the frame frame by a hydraulic cylinder. Let's do it.

By using such a device, it is possible to simultaneously inject paint, rotate, revolve, close a lid, and recover excess paint to a plurality of objects to be painted simultaneously. can do.

According to the present invention as described above, by injecting a predetermined paint into the coated object, and then rotating the coated object as if inverted up and down to apply the coating to the inner surface of the coated object, thereby simply coloring At the same time, the product can be colored without losing the properties such as glossiness of the glass surface, and it can make products with high decorative effect.

In particular, according to the present invention, since the inside of the coated object is coated while rotating and revolving, the entire inside of the coated object can be evenly and efficiently coated, and the paint residue is accumulated or flowed out by sucking out the excess paint later on. Can be prevented from staining and can be coated with a uniform film thickness. Therefore, it can then be used as a product only by drying a coating film. In other words, in the case of coating on the outer surface, the coating film is exposed, so that the coating film is easily peeled off by contact with a finger or a foreign material, only by drying, so that the following baking step is indispensable, but according to the method of the present invention Since it is coated on the inner surface, the coating film does not have to be touched by a finger or a foreign material, and thus the coating film is not inadvertently peeled off, so the later baking step may be omitted. In addition, when the baking process is added, the coating film is integrally attached to the inner surface of the object to be coated and the gloss can be further increased, thereby increasing the value of the product. In addition, it is possible to prevent the coating block, etc., and to suppress the occurrence of defective products as much as possible, but if any one of the coating stains occurs, it is possible to simply peel off the chart by cleaning before baking. Therefore, what is necessary is just to coat this to-be-processed object again by the said process after washing | cleaning.

If it is a method of chemically coloring the raw material itself by using a conventional metal compound, if a color miss occurs, it cannot be disposed of, but according to the above method, since it is possible to repaint after cleaning, it is very economical by reducing the loss.

Claims (1)

The paint is applied to the inner surface of the molded article by injecting a predetermined amount of paint into the bottomed cylindrical glass molded article with its opening upward and revolving it vertically while rotating the molded article. A method of painting the inner surface of a bottomed cylindrical glass molded article, characterized in that the opening is closed with a lid before the opening is lowered, and then the excess paint inside the molded article is sucked out and taken out.

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