การลดของเสียในกระบวนการผลิตผลิตภัณฑ์พลาสติก กลุ่มถังเก็บน้ำ : กรณีศึกษาโรงงานผลิต ผลิตภัณฑ์พลาสติก

Abstract

This minor thesis is studying the factors affecting waste generation in the process of forming a plastic water storage tank using a rotational molding method (Rotation Molding) in order to find the appropriate level of factor in the production process. The objective of the research is to reduce the amount of waste that occurs in the production process of plastic water tanks defining the amount of waste to be reduced by at least 10% from the total amount of waste generated in the product of plastic tank water storage. The waste is caused by air bubble exceeding the setting. The researcher began to study the production process using the flow process chart exploring factors affecting waste (Bubble Air) and brainstorm to find real cause of problem by fishbone map analyze the solution. The result show that the factor affecting for the waste product (Bubble Air) exceeding than experiment setting that is the temperature and time of molding baking. After the improvement by using technique of design of experiment factorial 2* to find the optimal level of two factors for twenty four times in experiment for each product in Polyethylene plastic water tank Buddy size as 600, 1000, 1200, 2000 and 3000 liters in optimal temperature and time of molding baking are 250, 300, 350, 350 and 400 degree Celsius and 20, 20, 30, 40 and 50 minutes respectively. The data collected of number of product Bubble Air 50 tanks in one month can be concluded that the average of waste product (Bubble Air) in size of Polypropylene plastic water tank sizes 600, 1000, 1200, 2000 and 3000 liters before improvements is 11.60% of production proportions after improvement the waste product decrease to 3.20 %. When adjust the significant affecting factors to waste product (Bubble Air) exceeding than setting effect the amount of waste product decrease from 32.80 to 12.40