Flexible paper straw

A flexible paper straw comprising:

• a paper tube which is a spiral tube having a tube wall with at least two layers and formed by using glue and paper material while the paper material is paper sheet material having at least two layers of paper, a first layer of paper and a second layer of paper;
• and
• a compressed corrugated portion which is a circular tube having parallel ridges and grooves on longitudinal sections thereof, formed on the tube wall of a part of the paper tube with a certain length and able to be bent freely;
• wherein the first layer of paper and the second layer of paper are paper strips with the same width;
• a long side of the first layer of paper and a long side of the second layer of paper are stacked and overlapping like tiles while one half of the first layer of paper is adhered to one half of the second layer of paper in the lengthwise direction by the glue and the rest half of the second layer of paper is adhered to one half of an adjacent layer of paper;
• the paper sheet material is spirally wound and adhered by the glue in a staggered and overlapping manner to form the paper tube;
• the glue is located between the two adjacent layers of the tube wall which are formed by the first layer of paper and the second layer of paper respectively;
• wherein the paper tube is rolled by two parallel rollers to form a corrugated portion and then a pushing force is applied axially to each of two ends of the paper tube to form the compressed corrugated portion.