Pressure-resistant hose using polyethylene fabrics

Abstract

The present invention relates to a pressure-resistant hose and forming method thereof, which is capable of effectively spouting liquid or gas of high pressure even though the pressure-resistant hose is of a relatively small thickness, reducing the material cost of the pressure-resistant hose and improving the flexibility of the pressure-resistant hose. The Pressure-resistant hose comprises a first polyethylene mixture and one or more second hose layers. The first hose layer is formed by bonding together longitudinal ends of a first polyethylene mixture fabric coated with one or two watertight films at one or both surfaces of the first polyethylene mixture fabric. Each of said second hose layers if formed by bonding together longitudinal ends of a second polyethylene mixture fabric coated with one or two watertight films at one or both surfaces of the second polyethylene mixture fabric.

1 . A pressure-resistant hose, comprising: 
 a first hose layer, the first hose layer being formed by bonding together longitudinal ends of a first polyethylene mixture fabric coated with one or two watertight films at one or both surfaces of the first polyethylene mixture fabric; and    one or more second hose layers, each of said second hose layers being formed by bonding together longitudinal ends of a second polyethylene mixture fabric coated with one or two watertight films at one or both surfaces of the second polyethylene mixture fabric.    
     
     
         2 . The hose according to  claim 1 , wherein the bonded portions of said first hose layer and said second hose layers are circumferentially spaced apart from one another so as not to be overlapped.  
     
     
         3 . The hose according to  claim 1 , wherein a plurality of bonding agent strips are longitudinally formed on the contact surfaces of said first hose layer and said second hose layers.  
     
     
         4 . A pressure-resistant hose, comprising: 
 a plurality of polyethylene mixture fabrics and a plurality of watertight films, said polyethylene mixture fabrics and said watertight films being laminated together; and    a polyethylene protection film laminated on at least one of inner and outer surfaces of the laminated body to form a fabric sheet;    wherein a first longitudinal end of the fabric sheet is laminated on a second longitudinal end with the polyethylene protection film being disposed to constitute an innermost layer of the fabric film, so as to form a hose.    
     
     
         5 . The hose according to  claim 4 , wherein said fabric sheet is formed in such a way that said polyethylene mixture fabrics and watertight films are alternately laminated to form a first auxiliary sheet layer so that said watertight films are disposed on both surfaces of the laminated body, and said polyethylene protection film is laminated on an outer surface of said first auxiliary sheet layer.  
     
     
         6 . The hose according to  claim 4 , wherein said fabric sheet is formed in such a way that said watertight films are respectively laminated on both surfaces of each of said polyethylene mixture fabrics into a plurality of second auxiliary sheet layers, bonding watertight films are laminated between the second auxiliary layers into a multi-layered structure, and said polyethylene protection film is disposed on an outer surface of the multi-layered structure.  
     
     
         7 . A resistant-pressure hose forming method, comprising: 
 rendering a first polyethylene mixture fabric to have a circular cross section by passing the first polyethylene mixture fabric, coated with watertight films at one or both surfaces, through a first guide member to overlap a first longitudinal end of the first polyethylene mixture fabric on a second longitudinal end;    continuously applying a bonding agent on one longitudinal end of the first polyethylene mixture fabric;    forming a first bonded portion by bonding together both longitudinal ends of the first polyethylene mixture fabric while guiding the first polyethylene mixture fabric to surround an outer surface of the central pipe;    continuously applying a bonding agent on an outer surface of the first polyethylene mixture fabric, which is being moved along an outer surface of said central pipe, at a plurality of positions;    rendering a second polyethylene mixture fabric to have a circular cross section by passing the second polyethylene mixture fabric, which is coated with watertight films at one or both surfaces, through a second guide member to overlap a first longitudinal end of the second polyethylene mixture fabric on a second longitudinal end;    continuously applying a bonding agent on one longitudinal end of the second polyethylene mixture fabric;    bonding the second polyethylene mixture fabric on the first polyethylene mixture fabric at a plurality of positions, on which the bonding agent is applied, while guiding the second polyethylene mixture fabric to surround the first polyethylene mixture fabric along an outer surface of the central pipe; and    forming a second bonded portion by bonding together both longitudinal ends of the second polyethylene mixture fabric that is moved together with the first polyethylene mixture fabric along the central pipe.    
     
     
         8 . The method according to  claim 7 , further comprising the step of pressing a finished pressure-resistant hose by means of a pair of pressing rollers so as to wind the finished pressure-resistant hose around a winding roll.  
     
     
         9 . The method according to  claim 7 , wherein said first guide member and said second guide member are spaced apart from each other along a circumferential direction of said central pipe so as to prevent said first bonded portion from being overlapped with said second bonded portion.  
     
     
         10 . A resistant-pressure hose forming apparatus, comprising: 
 a central pipe disposed along a path through which a fabric sheet is moved, said central pipe having an outside diameter equal to an inside diameter of an objective pressure-resistant hose;    a plurality of guide blocks arranged along the central pipe one after another, said guide blocks respectively having guide passages to form a hose in such a way that a first longitudinal end of the fabric sheet is overlapped with a second longitudinal end and the fabric sheet surrounds the central pipe while being moved along the central pipe;    a bonding agent applying nozzle for continuously applying a bonding agent between the longitudinal ends of the fabric sheet that has passed through said guide blocks, said bonding agent applying nozzle being disposed behind the guide blocks; and    one or more pressing rollers for pressing an overlapped portion of the fabric sheet toward the central pipe so that both overlapped longitudinal ends of the fabric sheet are bonded together by the bonding agent, said pressing roller being disposed behind the bonding agent applying nozzle.    
     
     
         11 . The apparatus according to  claim 10 , wherein said guide blocks comprise: 
 a first guide block surrounding a front outer surface of said central pipe and having a U-shaped first guide passage formed along a longitudinal direction of the central pipe to curve the fabric sheet supplied from the winding roll in the form of a “U”;    a second guide block, said second guide block surrounding a central outer surface of the central pipe and having a second guide passage formed along a longitudinal direction of the central pipe to allow a half portion of the fabric sheet to surround the central pipe, left and right side portions of the second guide passage being respectively semi-U shaped and semicircular-shaped and the left and right side portions being connected at their lower ends; and    a third guide block, said third guide block surrounding a rear outer surface of the central pipe and having a circular third guide passage formed along a longitudinal direction of the central pipe to allow the fabric sheet having passed through said third guide block to surround the central pipe while a first end of the fabric sheet is overlapped with a second end of the fabric sheet.    
     
     
         12 . The apparatus according to  claim 10  or  11 , wherein a plurality of air pressure chambers are formed on upper and lower sides of the guide passages of said guide blocks so that air pressure applied from the outside is continuously applied to the air pressure chambers, so as to prevent friction between the fabric sheet and the guide blocks.  
     
     
         13 . The apparatus according to  claim 10 , wherein a plurality of air supply conduits are longitudinally formed in an interior of said central pipe for supplying air from the outside, and a plurality of branches are radially formed to be extended from said air supply conduits to a portion of an outer surface of the central pipe with which the fabric sheet comes into contact, so as to prevent friction between the fabric sheet and guide blocks.  
     
     
         14 . A pressure-resistant hose forming method, comprising the steps of: 
 moving a fabric sheet supplied from a winding roll along a central pipe;    curving the fabric sheet to have a U-shaped cross section by passing the fabric sheet through a U-shaped first guide passage of a first guide block;    allowing a half portion of the fabric sheet to surround a half portion of said central pipe by passing the U-shaped fabric sheet through a second guide passage of a second guide block, said second guide passage having a semicircular cross section and a semi-U cross section;    overlapping a first longitudinal end of the fabric sheet on a second longitudinal end while the fabric sheet surrounds the central pipe and the first longitudinal end is spaced apart from the second longitudinal end, by passing the fabric sheet through a third guide passage of a third guide block;    applying a bonding agent between both longitudinal ends of the fabric sheet; and    bonding together the longitudinal ends of the fabric sheet with the bonding agent by pressing an overlapped portion of the fabric sheet, on which the bonding agent is applied, toward the central pipe.    
     
     
         15 . The method according to  claim 14 , further comprising the step of applying predetermined air pressure from said central pipe or guide blocks to said fabric sheet during said first to third steps so as to prevent friction between said fabric sheet and said central pipe, or guide blocks.