JPS6220888A - Method for drying strip metallic foil - Google Patents

Abstract

PURPOSE:To prevent the generation of scratches and creases on the surface by removing the water deposited on the surface of metallic foil leaving the washing stage, then cutting off a water film remaining on the surface and subsequently removing the water on the surface by drying. CONSTITUTION:Metallic foil 8 leaving a washing stage is passed between a couple of wringer rollers 4 and 4 to remove the water deposited on the surface. Then a water film remaining on one surface is cut off by high-pressure air blown from an air knife 11 and a water film remaining on the other surface is cut off by high-pressure air blown from an air knife 13. The foil is then waved in a dryer 6 and moved between plural air nozzles 15, a minute amt. of water remaining on the surface is simultaneously removed by drying in the hot area and the foil is moved to the succeeding stage.

Description

[Detailed description of the invention] The present invention aims to solve the following problems.

(Industrial Application Field) The present invention relates to a method for drying a strip-shaped metal foil before sending it to the next process after a cleaning process when surface-treating the metal foil.

(Prior Art) When drying the metal foil as described above, conventionally, the drying is performed in a process as shown in FIG. 2, for example. That is, in FIG. 2, 1 indicates a cleaning step, in which cleaning is performed using water or hot water 3 stored in a tank 2. 4.4 is a pair of glue and ringer rolls; 5 is an air cylinder for applying clamping force to the ringer rolls; 6 is a dryer equipped with a plurality of nozzles 7. In such a device, the metal foil 8 is cleaned by passing it through water or hot water 3 in the cleaning step 1, and then passed between a pair of ringer rolls 4, 4 to remove the metal foil. The water adhering to the surface of the foil 8 is removed, and then,
Moisture remaining on the surface of the metal foil 8 is dried by hot air blown out from a large number of nozzles 7 in the dryer 6, and then the metal foil 8 is sent to the next process (for example, a winding process). When the metal foil 8 is dried as described above, if there are a large amount of water droplets on the surface of the metal foil 8 sent to the dryer 6, a large amount of energy will be required to dry it, and it will take a long time to dry. As a result, there is a problem in that stains remain on the surface of the metal foil 8 where water droplets have adhered. In order to eliminate this problem, it is necessary to increase the clamping force of the metal foil 8 by the ringer roll 4.4 to perfect the water removal. (approximately 50 microns or less) becomes wrinkled, which reduces its commercial value. In addition, in order to rapidly dry the moisture remaining on the metal foil 8 that has passed through the ringer roll in the dryer 6 so as not to leave any stains, the blowing speed of the hot air blown from the nozzle 7 is increased. There is a problem in that the metal foil flaps and comes into contact with the nozzle 7, causing scratches on its surface or causing wrinkles in the metal foil.

(Problems to be Solved by the Invention) This invention eliminates the above-mentioned conventional problems, and can remove water while weakening the gripping force of the metal foil by the ringer roll. It is possible to prevent the foil from wrinkling, and by scraping off the water film remaining on the metal foil with an air knife, it is possible to speed up the drying process when the foil is next dried with hot air blown out from the air nozzle. It can prevent the occurrence of stains, and in addition, during the hot air drying process, it can prevent the metal foil from flapping, causing contact scratches on the surface.
Another object of the present invention is to provide a method for drying a band-shaped metal foil that can prevent the occurrence of wrinkles.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Operation) The metal foil released from the cleaning process is passed between a pair of ringer rolls to remove water adhering to its surface. Next, the water film hX' remaining on the surface of the metal foil is scraped off with an air knife. Next, hot air blown out from a plurality of air nozzles dries the moisture on the surface of the metal foil.

(Embodiment) Hereinafter, a description will be given of FIG. 1, which shows an embodiment of the present application. The same reference numerals in FIG. 2 as in FIG. 2 represent functionally equivalent parts, and a detailed explanation of those parts will be omitted.

In the figure, reference numeral 11.13 is an air knife, which blows high-pressure air onto the metal foil to scrape off the water film on its surface. 12.14 is a bank up roll,
This roll supports the back surface of the metal foil 8 that is blown with high-pressure air from an air knife. Next, dryer 6
In the figure, reference numeral 15 denotes air nozzles on the second pressure pad, which are arranged in a staggered manner in the direction of movement of the metal foil, as shown in the figure.

In the structure described above, the metal foil 8 that has undergone the cleaning process is passed between a pair of ringer rolls 4.4 to remove water adhering to its surface.

In this case, the ringer rolls 4 and 4 are arranged so that a water film as thick as possible is left on the surface of the metal foil 8 that has passed between the pair of ringer rolls 4 and 4.
Water is removed with the clamping force weakened. Next, the remaining water film adhering to one side of the metal foil 8 is first scraped off by high-pressure air blown out from the air knife 11, and then the remaining water film adhering to the metal foil 8 is removed from the other side by the high-pressure air blown out from the air knife 13. The remaining water film is scraped off. By scraping off the water film using the air knives 11 and 13 in this manner, the surface of the metal foil 8 becomes in a state where almost no large water droplets remain (wet state). Next, the metal foil 8 in such a state is moved between the plurality of air nozzles 15 in the dryer 6 in a wavy state as shown in the figure by hot air blown out from each air nozzle.

While the metal foil 8 is moving, the hot air quickly dries the slight amount of moisture remaining on the surface of the metal foil 8. The dried metal foil 8 is then sent to the next process.

(Effects of the Invention) As described above, in the present invention, the metal foil that has come out of the cleaning process is passed through a pair of ringers to remove water.
When passing the metal foil between the rolls 4 and 4, the metal foil is passed between ringer rolls whose adhesion force is weakened so that a water film as thick as possible remains on the surface of the metal foil that can be scraped off with the air knife 11.13. It has the advantage of preventing the occurrence of wrinkles in metal foil.

Furthermore, when the water film is subsequently scraped off using the air knife 11 and 13, the thickness of the water film is kept within the range that can be scraped off with the air knife as described above, so that almost no large water droplets remain on the surface of the metal foil 8. It has the feature of being able to scrape off the water film cleanly. This has the effect that when the moisture remaining on the surface of the metal foil is subsequently dried with hot air, it can be dried in a short time so that no stains remain on the surface of the metal foil.

Further, when the slight amount of moisture remaining on the surface of the metal foil is dried with hot air blown out from the air nozzles 15 after the above-mentioned scraping, the metal foil is moved in a wavy state by the hot air blown out from the plurality of air nozzles 15 respectively. Since the metal foil is dried while being moved, the metal foil can be dried in a stable transport state, which has the effect of preventing the occurrence of contact scratches due to the fluttering of the metal foil, which is the case in the past. It also has the effect of increasing the bending strength of the foil and preventing wrinkles from forming on the metal foil.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a diagram schematically illustrating a cleaning process and a drying process of metal foil, and FIG. 2 is a diagram schematically illustrating a conventional cleaning process and drying process. 4... Ringer roll, 11.13... Air knife, 15... Air nozzle.

Claims (1)

[Claims] Along the movement path of the band-shaped metal foil sent from the cleaning process to the next process, a pair of ringer rolls sandwiching the metal foil to remove water adhering to its surface, and a pair of ringer rolls are installed. An air knife is used to scrape off the water film that remains on the surface of the metal foil after passing through the ringer roll, and an air knife is used to scrape off the water film that remains on the surface of the metal foil after passing through the ringer roll. A plurality of pressure pad type air nozzles are arranged in order to blow hot air to dry the moisture remaining in the metal foil, and the plurality of air nozzles are arranged in a state in which the metal foil is wavy in the direction of movement. When moving the metal foils from the cleaning process to the next process, the metal foils are arranged in a staggered manner in the direction of movement so that they can be moved by the ringer rolls. Water is removed with the clamping force weakened so that a water film as thick as possible remains on the surface as far as it can be scraped off with the air knife, then the water film remaining on the surface of the metal foil is scraped off with the air knife, and then A method for drying a band-shaped metal foil, characterized in that the hot air blown out from a plurality of air nozzles moves the metal foil in a wavy state between a plurality of air nozzles, and the hot air dries moisture on the surface of the metal foil.