What is Buffer Time
Buffer time is extra time added to a production plan to absorb unexpected delays such as machine breakdown, absenteeism, material shortage, or quality rework. It is not waste. It is insurance. Without buffer, every small problem becomes a shipment delay. With buffer, small problems are absorbed and the plan stays on track.
Types of Buffer
Capacity buffer is extra machine or line capacity kept free for emergencies. Time buffer is extra days added to the delivery schedule. Material buffer is safety stock of fabric or trims. Quality buffer is allowance for expected rework.
Practical Example 1 — Order Planning
An order needs 20 production days. The planner adds 3 days buffer and confirms 23 days to the buyer. If two days are lost to machine breakdown, the order still ships on time.
Practical Example 2 — Material Buffer
A style needs 10,000 meters of fabric. The planner orders 10,300 meters, 3 percent buffer. If shade variation causes rejection of 200 meters, the order still completes.
Practical Example 3 — Capacity Buffer
A line is loaded at 85 percent of capacity, leaving 15 percent buffer. When a rush order comes, it can be absorbed without breaking the plan.
Practical Example 4 — No Buffer Disaster
A factory plans at 100 percent capacity with no buffer. One machine breaks down for 2 days, and the entire shipment is delayed by 4 days. The buyer charges a penalty.
How Much Buffer
Buffer depends on process stability. Stable processes need 5 to 10 percent buffer. Unstable processes need 15 to 20 percent buffer. The buffer should be based on historical data, not guesswork.
Buffer vs Waste
Buffer is planned. Waste is unplanned. Buffer absorbs problems that might happen. Waste is what happens when problems occur anyway. A good planner knows the difference.
Common Mistakes
Planning at full capacity with no buffer. Using buffer as an excuse for poor planning. Same buffer for every order regardless of complexity. Not tracking buffer usage to learn for future plans.
When to Use It
Buffer planning is used in every production plan, especially for peak seasons, new styles, new buyers, and complex orders. It is the mark of an experienced planner.