METHOD OF REMOVING PAINT

Abstract: The invention relates to a blasting method for removing coatings of paint, varnish or like substances from objects coated with such substances, in which the objects are cooled in a condensed gas, e.g. liquid nitrogen, and then subjected, in a chilled state, to the effect of a blasting agent, e.g. steel shot, delivered by a blasting machine. The coating fragments dislodged are collected together with the blasting agent and mutually separated one from the other in a separator. The recovered blasting agent is then returned to the blasting machine. The method is characterized by adding an absorbent to the blasting agent in the blasting machine.

Description: METHOD OF REMOVING PAINT. The present invention relates to a method for shot blasting objects for the purpose of removing coatings of paint, varnish or like substances therefrom, in which said objects are cooled in a condensed gas, for instance liquid nitrogen, and thereafter subjected, in a chilled state, to the effect of a blasting agent, such as steel shot, pellets or like particles delivered from a shot blasting machine, and in which method coating fragments and blasting shot are collected and separated from one another and the shot returned to the blasting machine. Such paint removing methods are used, for example, in the car manufacturing industry, in which painting or varnishing of car bodies is carried out with the car bodies suspended from fixtures intended for this pur¬ pose. As the car bodies are sprayed, the fixtures become coated progressively with successive layers of paint or varnish, which finally have to be removed from the fix- tures. Removal of these paint or varnish layers is effected by immersing the fixtures into a liquid hydro¬ gen bath, until the fixtures are sufficiently chilled, whereafter the fixtures are blasted with steel shot or some like blasting agent, delivered by a blasting machine. Blasting is effected, by throwing or slinging the shot against the paint coating on the fixtures, said coating having become brittle as a result of its exposure to the low bath temperature. Contact of the shot with the paint layers causes the paint to break up into fragments and dust, which fall to the floor together with the shot. It is then necessary to separate the shot from the paint debris. This is achieved by transporting the shot and paint debris to a drum sieve, in which larger paint fragments are removed, and then to a wind sieve, in which paint dust and shot fragments are separated from useful blasting shot. The blasting shot is transported from the wind sieve to the shot magazine of the blasting apparatus, from where the shot is conveyed to the throw¬ ing wheel, operative to throw the shot against the fixtures. However, in addition to coatings of paint and similar coating substances, these fixtures also become coated with anti-rust oils and greases, or other types of oil and greases, which when the fixtures are immersed in liquid nitrogen become brittle and hard. When the fix¬ tures are subsequently shot blasted, to remove the paint and varnish coatings, the oil loosens together with the paint and softens or melts such as to form together with paint dust and blasting shot a heavy dough-like mass which tends to fasten in the shot transporting and separating equipment, therewith creating disturbances in the operation thereof. Furthermore, the oil which accompanies the shot to the shot magazine of said blasting machine causes the shot to pack into adhesively bonded aggregates. These aggregates, or lumps of shot, interrupt the smooth delivery of the shot to the throwing wheel of the blast¬ ing machine, therewith varying the efficiency of the blasting operation. Furthermore, interruptions in opera¬ tion are often caused by blockaging of the blasting shot circulating system. The object of the present invention is to provide a method for preventing the oil present from resulting in interruptions in operation. This object is achieved by a shot blasting method in¬ tended for the removal of paint, varnish, or like sub¬ stances from objects coated therewith, said method comprising chilling the objects in a condensed gas, for instance liquid nitrogen, and then subjecting said objects, in a chilled state, to the action of a blasting agent, for instance steel shot, delivered by a blasting machine, and by collecting resultant coating fragments and blasting agent and mutually separating said frag- ments and said blasting agent in a separator, and retur¬ ning the blasting agent to the blasting machine. The method is characterized by adding an absorbent to the blasting agent in the blasting machine. The absorbent used is a preparation capable of absorbing technical oils. Preferred absorbents are mineral prepa¬ rations. The absorbent used will preferably be in the form of granules. A particularly preferred absorbent is a preparation sold under the trade name ABSOL, which is a mineral granulate effective in absorbing technical oils. When carrying out the method according to the present invention, one liter of absorbent can be added to the shot magazine for each blasting period of three minutes. The absorbent functions to absorb the oil present in the shot and accompanies the shot to the throwing wheel of the blasting machine and is crushed to a fine dust during the actual blasting operation, this dust absorb- ing further oil from the shot-blasted objects. The oil- containing absorbent is then separated from the shot, together with paint dust, in a wind sieve. The separated dust is then collected in a bag filter and transported away. In the case of the example described above, all absor¬ bent will have been slung against the fixtures after a time period of about 0.5 minutes. Consequently, no absorbent will be present during the remainder of the shot blasting period. The absorbent is nevertheless efficient, because the oil is often present solely on the outer surfaces of the fixtures and is consequently removed first. The absorbent may be added continuously or discon¬ tinuously in batches, during the whole of the period during which shot is thrown from the blasting machine against the object being de-coated. Such prevention of blockaging of the shot transporting system of said shot blasting machine and prevention of irregular feed to the shot throwing wheels will also reduce the mechanical wear on the transporting and separating system. The shot used in the aforedescribed example has a dia¬ meter of 0.5-1.0 mm. It will be understood, however, that other blasting agents may be used, such as sand for instance. The present invention can also be applied when the coatings to be removed are laden with grease or lubri¬ cant or other substances capable of adhesively binding together the shot and coating material removed thereby. Naturally, one condition for successfully avoiding the problem of adhesion is to use an absorbent capable of absorbing the substance causing the adhesion or to remove or modify said substance in some other way, so that said substance will no longer have a disturbing effect.

Claims: CLAIMS 1. A blasting method for removing from objects coatings of paints, varnish or like substances, comprising cool¬ ing the objects in a condensed gas, e.g. liquid nitro¬ gen, subjecting said objects, in a chilled state, to the effect of a blasting agent, e.g. steel shot, delivered by a shot blasting machine, collecting coating fragments and blasting agent and mutually separating said frag¬ ments and said blasting agent in a separator, and retur¬ ning the blasting agent to the blasting machine, charac¬ terized by adding an absorbent to the blasting agent in said machine. 2. A method according to Claim 1, characterized by adding a granular absorbent to said blasting agent. 3. A method according to Claim 1 or 2, characterized by adding an oil absorbing substance to said blasting agent. 4. A method according to Claim 1 or 2, characterized by adding ABSOL to the blasting agent. 5. A method according to one or more of Claims 1-4, characterized by continuously adding absorbent to the blasting agent magazine of said blasting machine. 6. A method according to one or more of Claims 1-4, characterized by periodically adding absorbent to the magazine of said blasting machine, the times of such periodic addition being equal to the time taken for the blasting agent to circulate in the machine. 7. A method according to one or more of Claims 1-4, characterized by periodically adding absorbent to the magazine of the blasting machine, the times of said periodic addition corresponding to the treatment time of said object.

Inventors: ORSEN MIKAEL, ORSEN, MIKAEL
Applicants: AGA AB, AGA AKTIEBOLAG
Application year: 1988
Main classification: B44D3
IPC codes: B44D3