JPS6190777A - Method for releasing alumite by shot blasting - Google Patents

Abstract

PURPOSE:To release alumite without using a sulfuric acid solvent by shot- blasting an anodized Al material with a shot of a hard ball without contg. iron as the substrate pretreatment for painting an Al color sash, etc. CONSTITUTION:In the substrate pretreatment for painting an Al color sash, etc., an anodized Al material is shot-blasted with a shot of a hard ball without contg. iron (e.g., alundum hard balls) to release the alumite. Consequently, the alumite can be rapidly and completely released without using a sulfuric acid solvent, and the spreading of a paint can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for peeling off alumite as a base pretreatment when painting aluminum color sash used for building materials and the like.

(Prior Art and Problems) Aluminum rods, aluminum plates, etc., which are the materials for aluminum color sashes, are generally shipped with their surfaces treated with alumite. Aluminum materials for color sashes that are not anodized are not commercially available, so they are anodized to avoid corrosion during long-term storage.

However, since the paint does not stick on the alumite, when manufacturing aluminum color sash etc., the alumite must first be peeled off as a pre-treatment for the base of painting.

Conventionally, a sulfuric acid-based solvent has been used for this alumite removal treatment. However, peeling treatment using chemicals has drawbacks such as corroding the fabric of the material and being harmful to the human body.Furthermore, after treatment, the material needs to be washed, resulting in water pollution from wastewater, making it difficult for companies to take countermeasures. This is the current situation.

(Means for Solving the Problems) The present invention involves shot blasting an alumite-processed aluminum material using shot from a hard ball that does not contain iron, as a pretreatment for painting aluminum color sash and the like. The purpose of this method is to remove alumite without using sulfuric acid solvents.

Hereinafter, this invention will be explained based on examples.

(Configuration of the Embodiment) As shown in FIGS. 1 and 2, the molded aluminum sash parts W before assembly are placed on a conveyor and sent to the shot blasting device 2. This sash component W has nozzles 3 on the upper side and on the left and right sides, and shots are injected onto the sash component W from three directions to peel off the alumite.

Here, the shot used in this invention has an outer diameter of 0.5
It is a hard ball made of Alundum of 1.0 to 1.0 Tsuru and does not contain iron. If shot containing iron is used, iron will adhere to the surface of the aluminum fabric after peeling, so
The paint does not stick well and may cause the paint to peel off. The purpose of using a hard ball is to avoid damaging the fabric.

The sash parts W that have passed through the shot blasting device 2 are placed on the conveyor 1 again with the untreated surface (lower surface in the drawing) facing up, and are completely coated with alumite 71 by shot blasting.
1 Perform the release process.

In the example, a 6 m long sash part is conveyed by a conveyor at a speed of approximately 0.1 m/sec, and the nozzle 3 is conveyed at a speed of approximately 6 to 5 m/min.
Inject kg.

(Function) The alumite layer formed on the aluminum fabric is rapidly and completely peeled off by the blast of hard balls, so the fabric is exposed. Moreover, the surface of the fabric hardens due to the impact of the blast.

It should be noted that this invention is not limited to the alumite peeling treatment of aluminum, but can of course be applied to the alumite peeling treatment.

(effect) The effects of this invention are listed below.

(11 By hitting the surface of the aluminum material with a hard ball, the surface of the aluminum material hardens and becomes less susceptible to external damage. As a result of Vickers (HV) measurement, the Pinkers hardness is: Alumite treated material 72 Alumite peeling treatment using solvent 69 This is a mime removal treatment using shot blasting, which hardens the surface more than alumite treatment.

(2) Corrosion resistance is significantly improved compared to chemical stripping treatment using a solvent.

(3) The fine irregularities created on the surface by shot blasting improve the adhesion of the paint, resulting in a more beautiful finish than chemical stripping treatment using solvents.

(4) Unlike chemical stripping treatment using solvents, there is no corrosion of the material, and there is no need for cleaning, so equipment and labor can be saved, and there is no risk of water pollution due to wastewater. It is also good for the health of workers.

(5) It is efficient because the peeling process can be performed continuously using a conveyor.

[Brief explanation of drawings]

FIG. 1 is an enlarged front longitudinal cross-sectional view of the main part of the alumite stripping treatment equipment, and FIG. 2 is a side view of the alumite stripping treatment equipment. 1... Conveyor 2... Shot blasting device 3... Nozzle W... Satsushi parts

Claims (1)

[Claims] (1) In the pretreatment of the base for painting of aluminum color sashes, etc., the alumite is removed by subjecting the alumite-treated aluminum material to shot blasting using shot from hard balls that do not contain iron. Alumite removal treatment method using shot blasting.