Improving Manufacturing Efficiency: EMC Plasti-brack Case Study
This paper presents a productivity improvement plan for the Plasti-brack (F90) product line at Excellent Manufacturing Company (EMC), with the goal of contributing to a company-wide 8% efficiency increase. Using output-to-input productivity indicators across the steel bracket presses, plastic injection molding stations, assembly line, and bulk packaging stations, the plan identifies key bottlenecks in the manufacturing workflow. It then proposes concrete improvements in three areas: basic process optimization, shop floor space reallocation, and die changeover time reduction through staggered press scheduling and Single Minute Exchange of Die (SMED) retraining. The paper concludes with optimal recommendations for aligning production rates across all stages of the F90 line using Just In Time manufacturing principles.
- Overview and Productivity Goals: EMC's 8% efficiency goal and plan scope
- Basic Process Improvement: Output/input ratios identify key bottlenecks
- Space Use Improvement: Floor layout changes reduce material handling lag
- Die Changeover Time Reduction: Staggered scheduling and SMED cut press downtime
- Optimal Recommendations: Unified JIT strategy for full F90 line alignment
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What makes this paper effective
- Uses quantitative output/input ratios consistently throughout to ground every claim in measurable data, making recommendations concrete and defensible.
- Organizes improvements by increasing complexity — from basic indicator analysis, to layout changes, to retraining programs — giving the plan a logical escalation.
- Connects specific findings (e.g., die changeover time of 3.5 hours × 5 changeovers) directly to proposed solutions (staggered press scheduling, SMED), maintaining a tight evidence-to-recommendation chain.
Key academic technique demonstrated
The paper demonstrates applied quantitative analysis in an operations management context. Rather than describing problems in general terms, it calculates actual productivity ratios (e.g., F90/S90 = 480/14.8 = 32.4 when changeover time is included) to expose hidden inefficiencies. This technique — deriving actionable insight by reframing a known metric with a previously excluded variable — is a hallmark of rigorous process improvement writing.
Structure breakdown
The paper opens with a brief framing of the company's efficiency goal and the scope of the plan. It then moves through four substantive sections: a productivity indicator analysis identifying bottlenecks, a floor layout recommendation, a detailed treatment of die changeover time with short- and medium-term solutions, and a final set of optimal recommendations. Each section builds on the prior one, culminating in a unified Just In Time strategy for the F90 line.
Overview and Productivity Goals
Excellent Manufacturing Company's (EMC) goal this year is to improve overall efficiency by 8%. Having examined the manufacturing processes and organizational dynamics, this target appears achievable. The Plasti-brack product line has several productivity indicators that can be improved, which will save EMC time and cost while contributing to better consumer value. This productivity improvement plan identifies areas that are currently highly productive, areas where productivity can be enhanced, quantitative measurements of the processes involved in Plasti-brack manufacture, and a concrete plan for improvement.
Basic Process Improvement
A first-pass analysis should lay the groundwork for productivity improvement by asking: what indicators exist that can be improved? In the processes central to or connected with Plasti-brack manufacture and packaging, the most relevant productivity indicators — expressed in the form of Output / Input — are as follows.
S90 / Ft. Raw Steel Coil: This indicator reflects the productivity of the S90 presses. P90 / Gm. Raw Plastic: This indicator reflects the productivity of the P90 injection molding process. As of the current analysis, information about these indicators — specifically, the amount of steel coil and raw plastic used as input for essential P90 output — was not available.
F90 / S90: This indicator reflects the productivity of the S90 manufacturing process and part of the F90 assembly process. In terms of time, this indicator's current value is 480/400, or 1.2. This means that the number of assembled F90s that can be produced is 20% greater than the S90 input it is receiving from the steel bracket presses.
F90 / P90: This indicator reflects the productivity of the P90 molding process and part of the F90 assembly process. Its current value is 480/720, or approximately 0.67. In other words, the F90 assembly line is handling roughly two-thirds of the input arriving from the plastic injection molding stations.
B-F90 / F90: This indicator reflects the efficiency of the transition from F90 assembly to bulk packaging. Its current value is near 0.1, since the packaging line can only receive assembled F90s at a rate of 480 per hour, while the total processing capacity of the packaging line is 4,830 pieces per hour — roughly 12 cases of B-F90s per hour.
The "worst cases" in the Plasti-brack assembly process are therefore the transitions from steel bracket production to F90 assembly, and from fully assembled F90s to the bulk packaging stations. EMC should seriously consider investing in an expanded assembly team, or re-engineering the bracket production process to eliminate quality control delays through the mistake-proofing methods used so successfully by Toyota and other Japanese manufacturers.
If the F90 line were to perform at top efficiency, the current injection molding capacity and bulk packaging machines would set the standard at 720–1,200 pieces per hour. The project goal should be to improve all intermediary process steps so that the steel bracket presses and manual assembly stations can keep pace with these process leaders.
Space Use Improvement
Floor layout can be a simple and effective way to improve manufacturing productivity by reducing lag between manufacturing runs and raw material resupply cycles. Both the P90 and Soap Dish injection molding stations rely on the Raw Plastic material storage area depicted on the shop floor diagram. If the Raw Plastic area were relocated to be equidistant from both the P90 and Soap Dish manufacturing stations, both processes would see significant improvement. Swapping the Raw Plastic area with the staging storage for two other product flats would accomplish this improvement without requiring major changes to the shop floor.
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