JPH067749A - Method and apparatus for cleaning metal foil clad laminate - Google Patents

Abstract

PURPOSE:To prevent the exposure of copper foil caused by the generation of damage and rust due to dust or brought about in the process of circuit formation by removing completely the dust stuck on the surface of a copper clad laminate. CONSTITUTION:A copper clad laminate, which is cleaned in advance with high-pressure water having electric conductivity of 130-170mus/cm, is cleaned again with water having electric conductivity of 100-130mus/cm to finish the cleaning. A dust removing apparatus is composed of six chambers: a coarse cleaning 1, a high pressure cleaning 2, and a finish cleaning chamber 3 which are separated by partitions each other and linked in series; a squeezing roller 4; a cold air drying 5; and a hot air drying chamber 6. A roll conveyer 7 is installed which penetrates horizontally the openings positioned at the central parts of the partitions. The metal foil clad laminate 8 is transferred from the front to the back of the washing apparatus by the rotation of a roller 9. In the cleaning chambers, nozzles 10 which eject water to the conveyer from the upper and under sides are installed. In the squeezing roller chamber, two rollers 11, which are coupled horizontally to allow the copper clad laminate to pass between them, are arranged. In the drying chamber, nozzles 12, 13, which blow cold and hot air to the conveyer from the upper and under sides, respectively, are fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning method and a cleaning device for removing dust generated when a metal-clad laminate is manufactured.

[0002]

2. Description of the Related Art Copper foil scraps, resin powder, glass filament scraps, etc. are generated in the process of processing a metal-clad laminate as a printed wiring board material. These dusts adhere to the surface or end surface of the product, damage the metal foil surface due to vibration during transportation, generate rust, or the so-called copper foil that remains without etching the copper foil during the circuit formation process. It causes the rest of the foil. Therefore, conventionally, the dust is removed by cleaning with a rotating brush or an adhesive roll, or by cleaning with a solvent or a combination of solvent and ultrasonic waves.

[0003]

Dust adhering to the surfaces and end faces of metal-clad laminates differs in the degree and amount of attachment depending on the processing method. Generally, in the case of surface attachment, the dust falls due to gravity and static electricity. It is considered that the adhesion is caused by the above, and in the case of the end surface adhesion, it may be simply adhering to the processed surface or may have entered into the concave portion of the processed surface. In any case, since these dusts cause scratches and rust and are harmful in the subsequent circuit forming process, they must be removed as much as possible.

However, in the conventional method using a brush or an adhesive roll, it is not only particularly difficult to remove the dust adhering to the end face, but the removed dust may re-adhere and the brush It is difficult to select adhesive rolls and maintain performance.

On the other hand, the method using a solvent is a waste liquid treatment,
Accompanied by difficult problems such as environment and safety. Further, the method of using ultrasonic waves together adversely affects the rust preventive film on the copper surface, and therefore rust may be generated.

It is an object of the present invention to provide a safe and efficient method for removing dust and a device therefor.

[0007]

According to the present invention, the electrical conductivity of the metal-clad laminate plate is 130 to 170 μS / cm.
Spray cleaning with water of 100 to 130
This is a method for cleaning a metal-clad laminate, characterized by spraying water of μS / cm for final cleaning.

Although washing with water is inexpensive and effective, even groundwater contains impurities, and if the amount of impurities is large, it has the same harmful effect as dust. The present inventors have found that the electrical conductivity of water having a large impurity concentration is large, in other words, the impurity concentration of water and the electrical conductivity are in a proportional relationship, and the electrical conductivity of water is used as the impurity concentration index. I acknowledged that I could use it. Therefore, it is possible to determine the possibility of use as washing water by the value of electric conductivity.

In order to improve the efficiency of removing dust, the first cleaning is performed at an electric conductivity of 130 to 170 μS / cm for 3 times.
High-pressure water of -5 MPa is used. And an electrical conductivity of 10
A final cleaning with water of 0 to 130 μS / cm and 0.1 to 0.2 MPa can sufficiently attain the object of the present invention.

Next, an apparatus for carrying out the cleaning method of the present invention will be described with reference to FIG. The cleaning device of the present invention is
The rough cleaning chamber 1, the high-pressure cleaning chamber 2, the finishing cleaning chamber 3, the roller squeezing chamber 4, the cold air drying chamber 5 and the hot air drying chamber 6 are sequentially connected through the partition walls 14 and the openings at the center of each partition wall are connected. A roller conveyor 7 is provided, and a metal-clad laminated plate placed on the roller conveyor 7 sequentially passes through each chamber by the rotation of a roller 9, and each cleaning chamber 1, 2, 3 has a nozzle 10 for spraying water from above and below. The roller squeezing chamber 4 is provided with a horizontal squeezing squeezing roller 11 through which the metal-clad laminated plate 8 can be passed, and the drying chambers 5 and 6 are provided with a blast nozzle 12 capable of blowing cool air or hot air from above and below, respectively. This is a metal-clad laminate cleaning device provided with 13.

[0011]

[Function] It is generally considered that the method of washing and removing dust with water is inexpensive and efficient. However, water contains impurities even though it is groundwater,
It cannot be used as wash water because of its impurities. In the present invention, water having an electric conductivity of 130 to 170 μS / cm is used for rough cleaning and high-pressure cleaning as an index of the impurity content of the cleaning water, and is attached to the surface of the metal-clad laminate. Remove dust with water pressure and wash away. Then, the dust adhering to the end face is removed by the shearing force of the jetted water. Then electrical conductivity 100-130 μS
Dust is completely removed by a final wash with / cm water.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. A rough cleaning chamber 1, a high-pressure cleaning chamber 2, a finishing cleaning chamber 3, in order from the front part to the rear part of this device,
The roller squeezing chamber 4, the cold air drying chamber 5, and the hot air drying chamber 6 are arranged in a straight line. Each chamber is surrounded by upper and lower walls, left and right side walls, and front and rear chamber spacing walls, and a through hole is provided in the center of each partition wall so that the metal-clad laminate can be conveyed by the roller conveyor 7 in the front-rear direction of the apparatus. The metal-clad laminate 8 placed on the sheet is sent from the front part to the rear part of the apparatus by the rotation of the roller 9.

The metal-clad laminate sent to the front of the apparatus is first jetted from the upper and lower nozzles 10 in the rough cleaning chamber 1 with an electrical conductivity of 130 to 170 μS / cm and a pressure of 0.1 to 10.
Electrical conductivity of 130 to 170 μS, which is washed with 0.2 MPa water and then sprayed from the upper and lower nozzles 10 in the high pressure washing chamber 2.
/ Cm, a pressure of 3 to 5 MPa, and then washed in the finishing cleaning chamber 3 with an electric conductivity of 100 to 130 μS / cm and a pressure of 0.
It was washed with water of 1 to 0.2 MPa. The amount of high-pressure washing water used was 100 to 200 l / m.

Next, in the roller squeeze chamber 4, the upper and lower squeezing rollers 11 are passed, and in the cool air drying chamber 5, cool air is blown from the upper and lower cold air nozzles 12, and in the hot air drying chamber 6, hot air is blown from the upper and lower hot air nozzles 13. Sent and dried. The wind speed of the cold air and the hot air was 20 m / s, and the temperature of the hot air was 50 to 80 ° C.

Under these conditions, the thickness is 4 mm, 340 × 510
mm rectangular copper clad laminate was washed. As a result, the remaining amount of adhered dust was 0.2 pieces / sheet. On the other hand, according to the conventional removal method, the number was 5 to 10 pieces / sheet.

[0016]

According to the method of the present invention, the number of remaining dust particles after cleaning and removal is significantly reduced as compared with the conventional method. Moreover,
As a result, it is possible to prevent harmful scratches, rust, or exposure of metal foil generated in the circuit forming process from dust residue.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a side cross section of a removing device.

[Explanation of symbols]

 1 Rough Cleaning Room 2 High Pressure Cleaning Room 3 Finishing Cleaning Room 4 Roller Squeezing Room 5 Cold Air Drying Room 6 Hot Air Drying Room 7 Roller Conveyor 8 Metal-clad Laminated Plate 9 Roller 10 Nozzle 11 Squeeze Roller 12 Cold Air Nozzle 13 Hot Air Nozzle

Claims (2)

[Claims] 1. The surface of a metal-clad laminate is washed with water having an electric conductivity of 130 to 170 μS / cm, and further washed with water having an electric conductivity of 100 to 130 μS / cm. A method for cleaning a metal-clad laminate, characterized by: 2. A rough cleaning chamber, a high pressure cleaning chamber, a finishing cleaning chamber,
A roller squeezing chamber, a cold air drying chamber and a hot air drying chamber are connected in sequence through partition walls, respectively, and a roller conveyor that connects the opening in the center of each partition wall is provided. Each washing chamber is made to pass through each chamber in turn, and each washing chamber has a nozzle for spraying water from above and below, and the roller squeezing chamber has a horizontal and upper and lower two squeezing rollers through which a metal-clad laminated plate can be passed. A washing device for metal-clad laminates, in which each drying chamber is equipped with a blowing nozzle that can blow cold or hot air from above and below.