| 摘要 |
<p>Recently, according to the Ministry of Oceans and Fisheries, 1400 ton of lead mass has been thrown away in sea for 5 years, and the lead mass used for manufacturing fishing sinkers is considered as a main culprit of heavy metal pollution. To reserve the pollution, a fishing sinker of the present invention is made from natural stones wherein the fishing sinker of the present invention hardly causes environmental pollution from lead or discharges harmful materials such as organic compounds, and is manufactured at an affordable price and convenient. The fishing sinker of the present invention is made by the following steps of punching a hole (30) on a natural stone (40) with use of a device in a picture; diluting mortar (20) which is mixed with cement and sand in 1 to 2 ratio with use of water; injecting the mortar into the hole; hanging a cyclic ring screw (10) on the hole; and slowly solidifying the same where the fishing sinker made from stone hardly causes environmental problems or discharges organic compounds while being manufactured at an affordable price, convenient and strong enough to be used for a long time.</p> |
