精品熟女视频一区二区三区,91色在色在线播放,五月天婷婷综合久久,久热中文字字幕在线

      

    1. 

        
    
        
    
        
        
        
        
        
    
        
    

        

    
        
        

        
        

            
        
                
        
                
        

                
                

                
        
                    
        Product features
        
                    
        Diameter: from 15 mm - 500 mm
        Maximum length: ≤10000mm

        Mainly used in film blowing, pipe, profile, sheet, granulation, cable and other single screw extruder products.


        Extruder screw barrel can be mainly subdivided into:
        1. Screw barrel of film blowing machine;
        2, blow molding machine screw barrel;
        3. Pipe screw barrel;
        4. Granulating screw barrel;
        5, PP/PE packing with screw barrel;
        6, sheet, profile screw barrel;
        7, wire and cable screw barrel

        
                
        
                
        
            
        

            
        
                
        
                    
        Extrusion screw - Extruder screw barrel
        
                
        
                
                
        
                
        
                    
        
                        
        screw:
        1. Normal nitrided (38CrMoAla/SACM645)
        2. Double alloy thread spray-welding bimetallic
        3 full coverage of tungsten steel screw wlfram steel screw
        4. Full hard series hard scries type

        Cylinder barrel
        1. Normal nitrided (38CrMoAla/SACM645)
        2. Internal hole centrifugal casting alloy bimetallic barrel(ABC class 3 and
        3. hard series barrel

        Technical indicators
        Surface hardness: HV≥290
        Nitriding hardness: HV850-1000
        Nitriding depth: 0.45-0.7mm
        Nitride brittleness: ≤ first grade
        Screw straightness :0.015mm
        After nitriding surface chromium plating hardness: ≥900HV
        Chromium plating thickness: 0.05-0.1mm
        Double alloy hardness: 60-70 HRC
        Depth of alloy: 0.8-2.0mm