Method for producing an aerosol dome

Abstract

Method for producing an aerosol dome having a dome region with an upwardly adjoining rolled rim arranged at an upper passage opening and with a downwardly adjoining flange region with an everted portion. An intermediate stage is prepared in one or more stages from a lacquer-coated blank (R), the intermediate stage having the upper passage opening, followed downwardly by a neck portion, then followed by the dome region, which is followed by an encircling straight flange. The intermediate stage is processed in a processing stage (S 9 ) in which only the everted portion is formed.

1 . A method for producing an aerosol dome,
 said aerosol dome having a dome region with an upwardly adjoining rolled rim arranged at an upper passage opening and with a downwardly adjoining flange region with an everted portion,   wherein said method involves preparing an intermediate stage in one or more stages from a lacquer-coated or polymer-coated blank, said intermediate stage having the upper passage opening, followed downwardly by a neck portion, then followed by the dome region, which is followed by an encircling straight flange,   and wherein this intermediate stage is then processed in a processing stage in which only the everted portion is formed.   
     
     
         2 . The method according to  claim 1 , wherein the intermediate stage has at least one of
 an outwardly directed collar and, at the transition from the dome region to the neck region, an outwardly curved wave.   
     
     
         3 . The method according to  claim 1 , wherein the processing stage for creating the everted portion is followed directly or indirectly by at least one further stage in which a rolled rim is formed from the neck portion,
 or wherein the processing stage for creating the everted portion is followed directly or indirectly by at least one further stage in which a preliminary stage or the final rim curl is created from the remaining flange.   
     
     
         4 . The method according to  claim 1 , wherein the lacquer-coated or polymer-coated blank is furnished in the form of a pot with an encircling flange, a rounded region and an end wall but without a neck region, and wherein at least one first stage, this blank is formed to the desired part height prior to the creation of a rolled rim with an axial neck region. 
     
     
         5 . The method according to  claim 4 , wherein, after the first stage, in at least one, or in two further stages, a second stage and a third stage, the neck region is formed further. 
     
     
         6 . The method according to  claim 4 , wherein, in at least one fifth stage, the end wall is punched out, forming the upper passage opening. 
     
     
         7 . The method according to  claim 4 , wherein, in one stage an outwardly curved wave is formed in the dome region at the transition from the dome region to the neck region. 
     
     
         8 . The method according to  claim 1 , wherein, in one stage scoring is carried out in the transitional region between the end wall and the neck region. 
     
     
         9 . The method according to  claim 1 , wherein, to produce the rolled rim from a cylindrical rim portion of the neck portion, in a first step, an initial zone of the rim portion is folded over by a positively controlled tool to form the collar and in a second step, a flanging die subsequently passes into the folded-over rim portion and flanges the latter to form a roll, wherein, in the first step, the initial zone of the rim portion is folded over by the tool, comprising a folding die and a counterholder, through an angle in the range of 75-105° from the axial direction to form a substantially radial encircling flange. 
     
     
         10 . The method according to  claim 9 , wherein the bending radius between the encircling flange and the adjoining axial portion is smaller than twice the material thickness of the cylindrical rim portion,
 or wherein the radial length of the flange is in the range of 2-5 times the material thickness of the cylindrical rim portion.   
     
     
         11 . The method according to  claim 1 , wherein the material thickness of the blank (R) is in the range of 0.1-1 mm. 
     
     
         12 . The method according to  claim 1 , wherein the material of the blank (R) is sheet steel. 
     
     
         13 . The method according to  claim 12 , wherein the material of the blank (R) is sheet steel
 having a yield strength, determined according to DIN EN 10002-1:2001, of at least 500 MPa,   or having a tensile strength, determined according to DIN EN 10002-1:2001, of at least 500 MPa,   or wherein the material of the blank (R) is sheet steel,   or wherein the lacquer is a lacquer coating based on polyester lacquer, polyurethane lacquer, acrylate lacquer, methacrylate lacquer, or a mixture of such systems,   or wherein the polymer coating is a plastics coating based on polybutylene terephthalate, polypropylene, polyethylene, or a mixture of such systems.   
     
     
         14 . The method according to  claim 1  to produce an aerosol dome for a spray can. 
     
     
         15 . An aerosol dome for a spray produced using a method according to  claim 1 . 
     
     
         16 . The method according to  claim 1 , wherein the processing stage for creating the everted portion is followed directly or indirectly by at least one further stage in which a preliminary stage or the final rim curl is created from the remaining flange, wherein this further stage, if only a preliminary stage is formed, is carried out in combination with a stage in which a rolled rim is formed from the neck portion, and wherein this stage is then followed by a further stage (S 11 ) in which the rim curl is formed. 
     
     
         17 . The method according to  claim 1 , wherein the lacquer-coated blank is furnished in the form of a pot with an encircling flange, a rounded region and an end wall but without a neck region, and in at least one first stage, this blank is formed to the desired part height prior to the creation of a rolled rim with an axial neck region, and also in this first stage (S 1 ), the radius at the transitional region between the flange and the rounded region is reduced, to a radius in the range of 0.2-1.0 mm, or in the range of 0.3-0.6 mm. 
     
     
         18 . The method according to  claim 4 , wherein, after the first stage, in at least one, or in two further stages, a second stage and a third stage, the neck region is formed further, the radius of the region between the axial neck region and the radial end wall is reduced, to a sharp edge with a radius in the range of 0.2-1.0 mm, or in the range of 0.3-0.6 mm. 
     
     
         19 . The method according to  claim 4 , wherein, in at least one fifth stage, the end wall is punched out, forming the upper passage opening, and subsequently in a sixth stage, the encircling edge formed as a result is folded over to form a collar. 
     
     
         20 . The method according to  claim 19 , wherein, after the first stage, in two further stages, a second stage and a third stage, the neck region is formed further, and wherein the fifth stage and the sixth stage are carried out after the two further stages. 
     
     
         21 . The method according to  claim 6 , wherein in in the fifth stage an outwardly curved wave is formed in the dome region at the transition from the dome region to the neck region. 
     
     
         22 . The method according to  claim 1 , wherein in at least one of a second stage and a third stage and a fourth stage, scoring is carried out in the transitional region between the end wall and the neck region. 
     
     
         23 . The method according to  claim 6 , wherein, to produce the rolled rim from a cylindrical rim portion of the neck portion, in the fifth step, an initial zone of the rim portion is folded over by a positively controlled tool to form the collar and in a second step,
 in which the processing stage for creating the everted portion is followed directly or indirectly by said second step in which a rolled rim is formed from the neck portion,   or wherein the processing stage for creating the everted portion is followed directly or indirectly by said second step in which a preliminary stage or the final rim curl is created from the remaining flange   and in which second step a flanging die subsequently passes into the folded-over rim portion and flanges the latter to form a roll, wherein, in the first step, the initial zone of the rim portion is folded over by the tool, comprising a folding die and a counterholder, through an angle in the range of 75-105°, or in the range of 80-100°, or in the range of 85-95°, from the axial direction to form a substantially radial encircling flange.   
     
     
         24 . The method according to  claim 9 , wherein the bending radius between the encircling flange and the adjoining axial portion is smaller than twice the material thickness of the cylindrical rim portion, wherein the bending radius lies in the range of 0.5-1.5 times, or in the range of 0.75-1.25 times the material thickness of the cylindrical rim portion,
 or wherein the radial length of the flange is in the range of 3-4 times the material thickness of the cylindrical rim portion.   
     
     
         25 . The method according to  claim 1 , wherein the material thickness of the blank (R) is in the range of 0.15-0.4 mm, or in the range of 0.18-0.34 mm. 
     
     
         26 . The method according to  claim 1 , wherein the material of the blank (R) is tinplate. 
     
     
         27 . The method according to  claim 12 , wherein the material of the blank (R) is sheet steel
 having a yield strength, determined according to DIN EN 10002-1:2001, of at least 550 MPa,   or having a tensile strength, determined according to DIN EN 10002-1:2001, of at least 575 MPa,   or wherein the material of the blank (R) is tinplate of the type TH520, material number 1.0384; TH550, material number 1.0373; TH580, material number 1.0382; TH620, material number 1.0374, or the corresponding TS types, each according to DIN EN 10202:2001, and/or DR8, DR8.5, or DR9, each according to AISI/ASTM 623.