Method for producing flexible containers comprising a dispensing valve

Abstract

The invention relates to a method for producing flexible containers comprising a dispensing valve, said method including: vertically forming a tubular body ( 2 ) by means of vertically displacing and longitudinally folding a heat-sealable film ( 1 ); longitudinally welding two vertical ends ( 11, 12 ) of the heat-sealable film ( 1 ); producing, from the tubular body ( 2 ), independent flexible envelopes ( 3 ) provided with a closed bottom and an open upper mouth ( 33 ), by means of carrying out successive transverse weldings ( 32 ) and transverse cuts in said tubular body; and horizontally moving the successive flexible envelopes ( 3 ) through a series of working stations wherein the product to be packaged is dosed, a dispensing valve ( 4 ) is placed in the upper mouth ( 33 ) of the flexible containers ( 3 ), and the upper mouth ( 33 ) is welded ( 34 ), securing the dispensing valve ( 4 ).

What is claimed is: 
     
         1 . Method for manufacturing flexible packages having a dispensing valve characterized in that it comprises the following steps:
 a) the unwinding of a flexible thermosealable film ( 1 );   b) the vertical forming of a continuous tubular body ( 2 ) by means of the vertical displacement and the longitudinal folding of the thermosealable film ( 1 ) such that the vertical ends ( 11 ,  12 ) of the thermosealable film ( 1 ) are arranged opposing each other along their entire length;   c) the longitudinal sealing of the two opposing vertical ends ( 11 ,  12 ) of the thermosealable film ( 1 ) laterally closing the tubular body ( 2 );   d) obtaining independent flexible successive envelopes from the tubular body ( 2 ), provided with a closed bottom and an open upper mouth ( 33 ), by means of carrying out successive transversal sealings ( 32 ) and transversal cuts in said tubular body;   e) the horizontal displacement of the successive independent envelopes ( 3 ) by a series of work stations in which the metering (D) or filling of the product to be packaged in the interior of the successive flexible envelopes ( 3 ) is carried out, the insertion of an dispensing valve ( 4 ) in the upper mouth ( 33 ) of the flexible envelopes ( 3 ) and the sealing ( 34 ) of the upper mouth ( 33 ) of the flexible envelopes, establishing its closing and the fixing of the dispensing valve ( 4 ) to the corresponding flexible envelope ( 3 ).   
     
     
         2 . Method according to  claim 1 , characterized in that during vertical forming of the tubular body ( 2 ), there are defined in the thermosealable film ( 1 ), longitudinal folds which define a flexible envelope ( 3   a ) having two faces ( 35 ), front and rear, and two lateral bellows ( 36 ). 
     
     
         3 . Method according to  claim 1 , characterized in that during vertical forming of the tubular body ( 2 ), there are defined in the thermosealable film, longitudinal folds which define a flexible envelope ( 3   a ) having two faces ( 35 ), front and rear, and two lateral bellows ( 36 ).