Hair treatment process

Abstract

A process for treating a lock of hair, involving moving a device along the lock to perform the following steps when the device is passed over the lock: a heat treatment by gripping between two jaws of the device that are hinged together and passing through an internal heat treatment zone extending between the two jaws, a heat-treatment by passage over an external heat treatment zone extending on the outer surface of one of the two jaws of the device, guiding by passing through a guiding zone extending outside the jaw of the device bearing the external heat treatment zone, the guiding zone having guiding surfaces at the proximal and/or distal part of the jaw, forming laterally to the guiding zone an obstacle to the hair that is sufficient to contain the hair in said guiding zone.

1 . A process for treating at least one lock of hair, involving the movement of a device along the lock of hair from the root to the tip of the hair in order to perform, during a passage of the device over the lock of hair, the following steps:
 a heat treatment of a portion of the lock of hair by gripping between two jaws of the device that are hinged together and passing through an internal heat treatment zone extending between the two jaws,   a heat treatment of the portion of the lock of hair by passage over an external heat treatment zone extending on the outer surface of one of the two jaws of the device,   an additional treatment of the portion of the lock of hair by passage through an additional treatment zone by the treatment device as it moves over the lock of hair, the additional treatment being performed by an additional treatment member extending from one of the jaws to the other of the jaws during the movement of the device along the lock of hair,   guiding the portion of the lock of hair by passing it through a guiding zone extending outside the jaw of the device bearing the external heat treatment zone, the guiding zone having guiding surfaces at the proximal and/or distal part of the jaw, forming laterally to the guiding zone an obstacle to the hair that is sufficient to contain the hair in said guiding zone, in which the guiding zone is formed at least partially by a lateral recess of one of the jaws, a part of the additional treatment member extending from the other jaw into the lateral recess.   
     
     
         2 . The process according to  claim 1 , in which the heat treatment by the internal heat treatment zone takes place at a temperature above 50° C. 
     
     
         3 . The possess according to  claim 1 , in which the heat treatment by passing over an external heat treatment zone is at a temperature above 50° C. 
     
     
         4 . The process according to  claim 1 , in which the guiding surface form an obstacle to the portion of the lock of hair of at least 2 mm. 
     
     
         5 . The process according to  claim 1 , in which the or each guiding surface has a variable height. 
     
     
         6 . The process according to  claim 1 , in which the heat treatment in the internal heat treatment zone is performed before the heat treatment in the external heat treatment zone on the portion of the lock of hair when the device is moved over the lock of hair. 
     
     
         7 . The process according to  claim 1 , in which the internal heat treatment surface is a hair contact surface of an internal heat treatment member, the process including passing the portion of the lock of hair, placed under mechanical tension between a lateral edge of the internal treatment member and an outer surface of the jaw bearing the internal treatment member adjacent to the lateral edge against the lateral edge, the portion of the lock of hair under tension presenting an angle of less than or equal to 120°, and strictly greater than 90°, with a median plane Z of the device, extending between the jaws in the moved-together configuration of the jaws. 
     
     
         8 . The process according to  claim 1 , in which the internal heat treatment zone is laterally offset upstream or downstream, the hair being moved from upstream to downstream during the heat treatment. 
     
     
         9 . The process according to  claim 1 , in which the heat treatment by passing over the external heat treatment zone takes place by contact of the portion of the lock of hair with an external heating surface extending over at least part of the outer surface of one of the jaws. 
     
     
         10 . The process according to  claim 1 , including heat treatment by passing through an additional external heat treatment zone extending over the outer surface of the other of the two jaws of the device. 
     
     
         11 . The process according to  claim 1 , including gripping of the device by an outer surface of a distal portion of the jaws not having an external heating surface during the movement of the device along the lock of hair. 
     
     
         12 . The process according to  claim 1 , including an additional treatment of the portion of the lock of hair by passage through an additional treatment zone by the treatment device as it moves over the lock of hair, the additional treatment notably being upstream of the abovementioned heat treatments and of the guiding of the hair. 
     
     
         13 . The process according to  claim 12 , in which the additional treatment includes the application of steam and/or combing of the portion of the lock of hair. 
     
     
         14 . The process according to  claim 1  in which the steps of the process are performed in succession along the lock of hair, in the following order:
 heat treatment in the internal heat treatment zone, hair guiding, and heat treatment in the external heat treatment zone, or 
 heat treatment in the internal heat treatment zone, heat treatment in the external heat treatment zone, guiding by the guiding zone.