JPH10174942A - Washing of plate-shaped object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and effectively wash a plate-shaped object, especially, a plate-shaped object having a large size by supplying a washing soln. to a trough-shaped liquid sump. part having weir members provided thereto in parallel to the width direction thereof in close vicinity to the upper surface of the plate-shaped object transferred in a horizontal posture and applying ultrasonic vibration to the washing soln. by an ultrasonic element. SOLUTION: A plate-shaped object 1 to be washed, for example, a glass plate is transferred in a horizontal posture in a washing process by a transfer means such as a belt conveyor. A pair of weir members 5, 5' are provided above the conveyor in parallel to be fixed in close vicinity to or in slide contact with the transferred glass plate 1 to form a trough-shaped liquid sump 6 along with the upper surface of the glass plate 1 and a washing soln. 3 flows in the liquid sump. 6. As the washing soln. 3, water or ion water is pref. and, if a surfactant is mixed with the washing soln., washing capacity is more enhanced. An ultrasonic element 7 is arranged to the liquid sump. 6 in close vicinity to the upper surface of the glass plate 1 and ultrasonic vibration is applied to the washing soln. to remove the contaminant on the glass plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing dirt which is particularly difficult to remove from a plate-like body such as a glass plate.

[0002]

2. Description of the Related Art Conventional ultrasonic cleaning is generally performed by applying ultrasonic waves to the entire cleaning tank filled with a liquid and immersing the object to be cleaned in the liquid. The size of the tank is limited, and the larger the tank, the larger the size of the ultrasonic transmission device, resulting in inefficiencies and other problems. Especially, it is not suitable for cleaning large-sized plate-like objects such as glass plates. It is.

Japanese Patent Application Laid-Open No. 54-56255 discloses an ultrasonic cleaning method for a glass plate, in which an ultrasonic element is provided close to the cleaning surface of the glass plate being transported, and the ultrasonic element and the glass plate cleaning surface are separated. It is disclosed that a cleaning water layer is formed in between, and ultrasonic waves are applied intensively through the cleaning water layer.

[0004] However, there is a problem that water is easily scattered by the ultrasonic vibration itself, it is difficult to form a stable cleaning water layer, and it is difficult to efficiently clean a portion to be cleaned, and it is difficult to improve the cleaning performance. .

Japanese Patent Laid-Open Publication No. Hei 7-201795 relates to a method for cleaning a substrate or the like, wherein the substrate is immersed in a mixture of a liquid such as a liquid organic compound having a lower freezing point of water and ice to remove ice particles. Cleaning by collision with a substrate is disclosed.

However, as described above, in the case of a large-sized glass plate, it is not appropriate to immerse it in a liquid and clean it. Also, an ultrasonic element is brought close to a part to be cleaned to remove liquid and solid particles (ice). It is difficult to say that it is more efficient than when high-energy vibration is applied.

The present invention has been made to solve the above-mentioned disadvantages of the prior art, and provides an efficient and effective cleaning method for plate-like bodies, particularly large-sized plate-like bodies.

[0008]

According to the present invention, a gutter-like liquid reservoir is formed by arranging a pair of dam members close to and parallel to a width direction of a plate-like body to be transferred in a horizontal posture. A cleaning liquid is supplied to the portion, and a cleaning method of the plate-like body is configured to apply ultrasonic vibration to the cleaning liquid by an ultrasonic element; a cleaning method of the plate-like body in which the cleaning liquid is water; A method for cleaning the plate-like body obtained by mixing a foaming surfactant, in addition, a method for cleaning a plate-like body obtained by mixing solid particles in a cleaning liquid,
A method for cleaning the plate-like body, wherein the solid particles are ice.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. 1 is a schematic plan view in a plate-like body cleaning step, and FIG. 2 is a schematic partial cross-sectional view in the longitudinal direction of FIG.

In the washing process, the plate-like body 1 to be washed, for example, a glass plate, is provided with a belt conveyor, a chain conveyor,
Alternatively, it is transported in the direction of the arrow in a horizontal posture by a transport means 2 such as a roller conveyor.

When a glass plate is made by a float method, a tin-like deposit called a top spec or a bottom spec or a strip-like deposit of tin oxide called a dross band sometimes adheres. There are cases. In addition, when the glass plate is cut to an appropriate size, fine glass powder called chippings adheres, but if the glass plate is left as it is and particularly placed in the presence of moisture, the soda content of the glass plate and the glass powder is reduced. It acts as a leaching glue to form a strong deposit. Alternatively, interleaving paper is interposed between the laminated glass sheets, but in the same manner as described above, in the presence of moisture, the oils and fats in the interleaving paper are leached out and the interleaving paper marks on the glass sheet are referred to as interleaving. Kimono occurs. The present invention can be favorably employed for removing dirt which is difficult to remove with such ordinary cleaning means.

In the present invention, a pair of weir members 5 and 5 'are previously arranged side by side on the conveyor, and are appropriately fixed by supporting means so as to be close to the glass plate 1 to be transferred or to be in sliding contact with the glass plate 1. A trough-shaped liquid pool 6 is formed with the upper surface of the glass plate 1, and the cleaning liquid 3 flows into the pool 6. The weir member may be formed over the entire width of the plate-shaped body as shown in the figure. However, when strip-shaped contaminants adhere to a specific area and it is desired to remove it mainly, it should be provided over the width of the specific area. Can also. As the inflow means 4 for the cleaning liquid, an appropriate means, for example, a spray device or a water injection pipe is used. Note that the liquid pool 6 is temporary, and the cleaning liquid may be allowed to naturally flow out from both ends in the longitudinal direction of the weir members 5 and 5 'as shown in the figure. Alternatively, a weir (not shown) may be further provided at one end of the weir member and discharged from the other end. May be released and discharged.

[0013] By forming the weir member in this manner,
The cleaning liquid stays in the area by the weir member, and does not scatter outside the area even if it is disturbed by ultrasonic vibration described later, and a stable liquid layer can be formed.

As the weir members 5 and 5 ', sponge or urethane foam which does not damage the glass plate may be used, and the material is not particularly specified. The width between the two weir members is 10 mm in consideration of the ultrasonic vibration intensive application to improve the cleaning effect, the tip of the ultrasonic element can be inserted, and the transfer speed of the glass plate (time to receive the cleaning action). Or 30
mm, and the upper and lower widths of the weir member are such that the scattering of the cleaning liquid can be prevented, that is, 10 mm or more, and these may be appropriately designed by a designer.

As the cleaning liquid 3, it is easy to dissolve and remove contaminants such as acids, alkalis, organic solvents, and ionized water. Of course, a liquid that does not corrode the plate-like body may be used. Water with less problems and ionized water are preferred.

Further, if a surfactant is mixed into the cleaning solution,
The cleaning ability is further improved. The type of the surfactant is not limited, but it is important that the surfactant does not foam due to the irradiation of ultrasonic waves. The concentration of the surfactant may be about 0.2 to 2% by weight.

In the liquid reservoir 6, one or more ultrasonic elements 7 are previously arranged close to the upper surface of the glass plate 1. It is effective that the distance between the tip of the ultrasonic element and the upper surface of the glass plate is 2 mm or less, more preferably 1 mm or less.

The output, amplitude, and frequency of the ultrasonic element 7 are appropriately selected. For example, the output is about 2 kW, and the amplitude is 60 to 1.
By applying an ultrasonic vibration having a frequency of about 20 μm and a frequency of about 20 to 40 kHz, contaminants on the glass plate can be efficiently removed.

FIG. 3 shows a schematic sectional view corresponding to FIG. 2 in the same plate-like body cleaning step as described above. In this embodiment, a case is shown in which a weir member is arranged on a plate-like body in the same manner as described above, and when the cleaning liquid flows therein and ultrasonic vibration is applied by an ultrasonic element, solid particles are mixed in advance in the cleaning liquid. is there. 3 corresponds to FIGS. 1 and 2, and reference numeral 8 denotes a solid particle.

The solid particles are significantly higher in specific gravity than the cleaning solution, and the ultrasonic vibration applied to the cleaning solution is unlikely to effectively act on the solid particles. It is sufficient if the natural sedimentation speed is low),
It has higher hardness than the plate-like body, and does not damage the plate-like body upon collision with the plate-like body. Furthermore, it has chemical affinity with the plate-like body and adheres to the plate-like body. Select and use the ones that never happen. As an example, amorphous silica powder or feldspar powder can be employed.

Preferably, water (including ionic water) is used as the cleaning liquid and ice is used as the solid particles. Even if the concentration of the pollutants is high, the waste water after washing can be circulated and used by a regenerating means such as a filtration device, and ice can be made and used by an ice making device or the like. Even when it is discharged outside the system, it can be easily discharged without requiring any special purifying means.

The particle size of the solid particles is appropriately designed and may be several tens μm to 1 mm or less, and the concentration of the solid particles may be from several wt% to several tens wt% in the washing liquid. Good.

[0023]

EXAMPLES Specific examples will be described below. A glass plate manufactured by a float method having a dross band (tin oxide-based band-like deposit) is cut into a desired size to produce a large number of test plates, and when the test plates are stationary, FIGS. 1, 2, and 3 Were formed, and each Example and Comparative Example was washed for 0.2 seconds, 0.5 seconds and ----- X seconds, observed for a dross band, and the time until it was removed was measured. .

Comparative Example 1 is an example in which the cleaning liquid (water) is supplied directly below the ultrasonic vibrating element without providing the dam member, and Example 1 is an example in which the cleaning liquid (water) is supplied with the dam member (FIGS. 1 and 2). 2
Example 2), Example 2 further contains a surfactant mixed in the liquid,
Example 3 shows an example in which only solid particles (ice) are mixed in the liquid (see FIG. 3).

The conditions are as follows. Washing liquid (water): 500 mL / min., Flows between weir members (pool), liquid layer depth of about 5 mm when weir members are provided. Mixing of solid particles (ice): ice with a particle size range of 0.5 mm to 1.5 mm. 10% by weight in water (Note: Ice melts with time at an ambient temperature of 15 ° C) Surfactant: Add 0.2% by weight of anionic surfactant Material of the weir member: polyurethane foam Width between both weir members , Weir member height: width 30mm, height 30mm Ultrasonic transmitter: output 2kw, frequency 20kHz, amplitude 100μm

The results are shown below. Comparative Example: Cleaning liquid (water) flows into the part without providing a weir member, dross removal time 5 seconds Example 1: Cleaning liquid (water) containing no solid particles flows between the weir members, dross removal time 0.5 seconds Example 2: Cleaning solution (water) mixed with a surfactant flows into the weir member, dross removal time 0.3 seconds. Example 3: Cleaning solution (water) mixed with solid particles (ice) flows between the weir members, dross removal. Time 0.2 seconds As described above, by providing a weir member and applying ultrasonic waves to the cleaning water, the dross band, which is a dirt that has firmly adhered to the glass plate, can be efficiently removed. It can be seen that the addition of exhibits a further cleaning action.

[0027]

According to the present invention, by providing a weir member and applying ultrasonic waves to the cleaning liquid, it is possible to efficiently remove dirt firmly adhered to the plate-like body, and further to add a surfactant or a solid to the cleaning liquid. When the particles are mixed, an effect that a further cleaning action can be exerted is exerted.

[Brief description of the drawings]

FIG. 1 is a schematic plan view in a plate-like body cleaning step.

FIG. 2 is a schematic partial cross-sectional view in the longitudinal direction of FIG.

FIG. 3 is a schematic sectional view corresponding to FIG. 2 in a plate-like body cleaning step according to another embodiment.

[Description of Signs] 1 -------- Plate to be cleaned 2 -------- Transfer means 3 -------- Cleaning liquid 4 -------- Inflow Means 5,5 '---- Weir member 6 -------- Liquid pool 7 -------- Ultrasonic element 8 -------- Solid particles

Claims (5)

[Claims] 1. A gutter-like liquid reservoir is formed by arranging a pair of dam members close to and parallel to a width direction of a plate-like body to be transferred in a horizontal posture, and supplying a cleaning liquid to the part. A method for cleaning a plate-like body, wherein ultrasonic vibration by an ultrasonic element is applied to the cleaning liquid. 2. The method for cleaning a plate-like body according to claim 1, wherein the cleaning liquid is water. 3. The method for cleaning a plate-like body according to claim 1, wherein a non-foaming surfactant is mixed in the cleaning liquid. 4. The method according to claim 1, wherein solid particles are mixed in the cleaning liquid. 5. The method for cleaning a plate-like body according to claim 4, wherein the solid particles are ice.