Method and apparatus for manufacturing synthetic resin bags having occludent means in the inside surface thereof

Abstract

.Iadd.A method and apparatus for continuously extruding a closed plastic tube with complementary releasably interlocking shaped rib and groove elements on the inner surface of the tube material and extending therealong with the plastic tubing being cooled closely following the extruding and thereafter while advancing the tube from the extruder forcing together the rib and groove elements into an interlocking position, the tubing being then passed through delivery rolls which operate at a predetermined speed, bags being cut from the tubing and heat sealed, and the bags being fed onto a conveyor belt whose rate of delivery is greater than that of the delivery rolls, with the cut edges of the bags being then pressed between a pressure plate and conveyor belt..Iaddend.

Having thus set forth the nature of the invention, what is claimed is: 
     
       1. An apparatus for manufacturing synthetic resin bags provided with occludent means, said apparatus being provided with cutting and heat sealing means, comprising a machine frame, delivery rolls at one end of said frame for delivering forth a tubular bag body material provided with occludent means and of flat and belt-like shape, an endless conveyor belt mounted forward of said delivery rolls, the travel of said conveyor belt being at a greater speed than the peripheral speed of said delivery rolls, an electrothermic type blade capable of making up-and-down movements in cycles disposed above that section at which said bag body material is transferred to said conveyor belt and in succession to said blade a pressure plate provided to make similar up-and-down movements as said blade. 
     
     
       2. An apparatus for manufacturing synthetic resin bags in accordance with claim 1 wherein means is provided in advance of the cutting and heat sealing means for joining said occludent means of the tubular bag body. 
     
     
       3. A method of manufacturing synthetic resin bags provided with occludent means which comprises flattening a tubular bag body into a flat belt-like state while maintaining in an occludent state a male rib and a female rib for occludent use, which have been protrudably provided parallel with the axis of said tubular bag body in the inside surface thereof, delivering forth said tubular bag body through delivery rolls continuously at a predetermined speed, then transferring the forepart of said tubular bag body to a conveyor belt whose rate of delivery is greater than that of said delivery rolls, simultaneously heat sealing while cutting to a predetermined width at said transfer section the flat belt-like bag body being delivered as described above by means of a heated blade which serves both as a heat sealing as well as cutting means thereby separating apart the individual bags from said bag body by means of the difference in the speeds of said conveyor belt and said delivery rolls and thereafter pressing the cut edges of the bags between a pressure plate and said conveyor belt. 
     
     
       4. A method of manufacturing synthetic resin bags in accordance with claim 3 including the steps of extruding the tubular bag body of a plastic and flattening the body and thereafter occluding the male and female ribs before said step of flattening the body into a flat belt-like state. 
     
     
       5. The method of making a tube structure from which flexible reclosable containers may be formed by .Iadd.simultaneously .Iaddend.cross cutting and seaming which comprises, extruding a one piece continuous closed tube, simultaneously extruding continuous axially extending interlocking complementary shaped rib and groove elements .[.with.]. .Iadd.within .Iaddend.the tube material and extending therealong,   and .Iadd.aligning the interlocking elements and .Iaddend.forcing the interlocking elements together to interlocking position.[...]. .Iadd.closely following the extruding step and while advancing the tube from the extruder. .Iaddend.