An innovative approach is proposed to sense the defect in the polymer bags by using the laser with alarm. In this method, a line laser is used to detect the fault in the polymer bags during the fabrication. The major problems faced by the polymer bags industries are, getting some defects due to inadequate flow of glue which produces a hole in the molded polymer during the production. The quality of polymer gets affected due to the hole, which leads to waste in the raw material and also increases the production cost. In the existing system, LED with Camera was used to find the defects. But this method is not sufficient to minimize the problem due to the limited intensity and scattering effect in LED. This technique reduces only 20% of defect and production cost. In the proposed system, a camera with 720p and a line laser with 650nm (red) wavelength are used instead of LED to reduce the defect and increase the construction cost. The proposed technique reduces up to 98% of shortcomings and also increases the quality of the production.