This study investigated model for line balancing in multi eschelon and multi product. A cement company which have 4 integrated plant consist of multi-eschelon 4 rawmill, 4 kiln, 9 finish mill with multi-product OPC and PCC. This paper proposed production cement plant mathematical model using mixed integer linear programming (MILP). The main objective of the model is minimize cost by changing decision variable production rate (ton/hour) and product allocation route. Constraint is demand fulfillment of multi product, inventory and production balancing, inventory and production min/max production. Furthermore, the improvement recommendation also will be declared in order to reduce production cost.The implication practice of proposed model of line balancing in multi-eschelon multi product continuous production is production manager could develop production planning and manage production rate in order to reduce production cost during multi period.

This study aims to apply Lean Manufacturing to Reduce Waste in the Production Process (Pole Posh) of Guardrail Products. The object of research is the result of the production of posh pole PT. XXX. The approach used in this research is descriptive qualitative approach. Descriptive qualitative research is meant about understanding phenomena that occur in the object of research. The snowball sampling method which is a sampling technique based on interviews or correspondence by asking for information from the first sample to get the next sample until research needs are met, in this study the snowball sampling method is used to select the correspondence at PT. XXX to find out the type of waste that occurs during production process in order to conduct further analysis in this study. Data collection techniques with primary data and secondary data, while data collection techniques with secondary data, observation and interviews. Data analysis technique used Value Stream Mapping