| 摘要 |
A synthetic resin double-layer plain tube and a manufacturing method thereof are provided to enhance the adhesion force of a synthetic resin adhesive layer and a micro tube so that the synthetic resin adhesive layer and the micro tube are not separated even under the drastic temperature change and when foreign materials are inserted between the synthetic resin adhesive layer and the micro tube. A synthetic resin double-layer plain tube comprises a hollow micro tube(10) wound in the spiral shape in the longitudinal direction, a plurality of combining holes(11) punched at regular intervals on both sides of the micro tube, a synthetic resin adhesive layer(12) adhering the neighboring micro tubes, a plurality of combining projections(13) inserted into the combining holes, and a protrusion(14) formed on the end tip of the combining projection.
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