The mattress factory runs on the raw materials, and the factory that runs out of the one material stops the whole line no matter how fast the machines are. The fabric roll that finishes the quilted panel, the wire that feeds the spring coiler, the foam that fills the core, the thread that sews the border and the film that packs the mattress are the consumables that the production eats every day, and the stockout of the smallest one stops the largest machine, so the inventory mix is the fuel tank of the factory. The machine tells which material matters: the IF-B100 High Speed Bonnell Spring Coiling Machine consumes the spring wire by the coil, the IF-QS-26 Computerized Single-Head Quilting Machine consumes the fabric and the thread by the panel, and the IF-CR8 Automatic Mattress Compression and Roll Packaging Machine consumes the packing film by the mattress, so the factory that maps the material to the machine knows exactly what to stock, and the inventory mix that covers every consumable keeps the production uninterrupted.
The stockout is the most expensive inventory event, and the factory that understands the cost of the empty bin manages the stock with the respect it deserves. The line-stop cost is the first number: the quilting machine that runs out of the fabric waits while the whole line behind it waits, the line-stop hour costs the output of the hour plus the wages of the idle crew, and the stockout of the cheap fabric costs the expensive line time, so the line-stop cost makes the cheap material the expensive problem. The rush cost is the second number: the factory that runs out orders the emergency material, the supplier ships the express freight, and the express freight costs the multiple of the normal freight, so the rush cost adds the premium to the material that was bought too late. The quality cost is the third number: the factory that substitutes the material to keep the line running, the substitute fabric or the substitute thread changes the product, and the changed product risks the customer claim, so the quality cost turns the inventory shortcut into the return risk. The schedule cost is the fourth number: the order that is delayed by the material shortage pushes the whole delivery schedule, the customer waits and the next orders shift, and the schedule cost spreads the one stockout across the many orders, so the schedule cost is the hidden multiplier of the shortage. The trust cost is the fifth number: the customer who receives the late order once remembers the delay, the repeated delays move the customer to the competitor, and the trust cost is the lost future revenue that the inventory report cannot show, so the trust cost is the reason the reliable factory stocks the reliable buffer. The stockout rule: the line stop, the rush freight, the substitute quality, the schedule shift and the lost trust are the five costs of the empty bin, and the factory that prices the five budgets the stock as the insurance, not the expense.
The raw materials of the mattress factory group into the five families, and the factory that tracks the five families covers the whole production. The fabric family is the first: the outer fabric, the quilting fabric and the border fabric arrive in the rolls, the patterns and the colors follow the product line, and the fabric is the visible material that the customer sees, so the fabric family is the largest and the most varied stock. The foam family is the second: the polyurethane foam blocks, the high-resilience foam and the memory foam arrive as the blocks and the slabs, the densities and the hardness follow the product spec, and the foam is the comfort material of the core, so the foam family needs the storage space and the handling care. The wire family is the third: the spring wire for the coiling arrives in the coils, the gauge and the temper follow the spring spec, and the wire feeds the IF-B100 Bonnell spring machine continuously, so the wire family is the critical stock of the spring line. The thread and the needle family is the fourth: the sewing thread of the quilting and the border, the needles and the spare parts of the sewing heads, and the thread colors follow the fabric colors, so the thread family is the small and the cheap stock that stops the machine when it runs out. The film and the packaging family is the fifth: the packing film, the cartons, the labels and the edge protectors pack the finished mattress, the film feeds the IF-CR8 packing machine by the roll, and the packaging family is the last material before the shipping, so the packaging family closes the material flow. The family rule: fabric, foam, wire, thread and film are the five families, and the factory that tracks the five by the consumption, the lead time and the reorder point keeps every machine fed.
The inventory math turns the stock into the numbers, and the three numbers of the minimum, the buffer and the reorder point run the replenishment. The consumption rate is the first number: the factory measures the material used per day, the fabric meters per day, the wire kilograms per day and the film rolls per day, and the consumption rate is the base of every stock number, so the factory measures the rate before it sets the levels. The lead time is the second number: the supplier delivery time from the order to the arrival, the local fabric supplier delivers in the week, the imported wire ships in the month, and the lead time decides how much stock the factory must carry, so the factory records the real lead time of each material. The minimum stock is the third number: the minimum is the consumption during the lead time, the fabric that consumes 200 meters a day and arrives in 7 days needs the 1,400 meters minimum, and the minimum covers the normal replenishment cycle, so the minimum is the stock that the factory must never go below. The safety buffer is the fourth number: the buffer covers the variance of the lead time and the consumption, the delayed delivery and the demand spike, and the buffer of the 20 to 50 percent above the minimum covers the variance, so the buffer is the insurance against the surprise. The reorder point is the fifth number: the reorder point is the minimum plus the buffer, the factory orders when the stock hits the reorder point, and the order arrives exactly as the stock reaches the minimum, so the reorder point is the trigger that keeps the stock between the minimum and the maximum, and the math keeps the line running with the least money on the shelf. The math rule: consumption times the lead time gives the minimum, the minimum plus the variance buffer gives the reorder point, and the factory that sets the three numbers by the measured rate and the real lead time runs the replenishment without the stockout and without the excess.
The machine-specific materials map the stock to the line, and the factory that feeds the machine feeds the production. The spring line materials are the first map: the IF-B100 Bonnell spring coiling machine consumes the spring wire by the coil, the wire gauge must match the spring spec, and the stockout of the wire stops the coiler and the whole spring line, so the spring line stocks the wire at the reorder point with the buffer for the import lead time. The quilting line materials are the second map: the IF-QS-26 quilting machine consumes the quilted fabric and the thread by the panel, the fabric pattern must match the product line and the thread color must match the fabric, and the stockout of the thread color stops the quilting while the fabric waits, so the quilting line stocks the thread colors with the fabric rolls as the matched pair. The packing line materials are the third map: the IF-CR8 packing machine consumes the packing film by the mattress, the film width and the thickness follow the mattress size, and the stockout of the film stops the packing and the shipping at the end of the line, so the packing line stocks the film rolls for the sizes in production. The border line materials are the fourth map: the tape edge machine consumes the border tape, the border thread and the needles, the tape width matches the mattress thickness, and the stockout of the tape stops the border station, so the border line stocks the tape rolls and the thread spools with the spare needles. The consumable plan is the fifth element: the factory makes the material plan per machine, the plan lists the material, the consumption per shift and the reorder point, and the operator checks the plan at the shift start, so the per-machine plan turns the stock into the daily routine. The map rule: wire for the coiler, fabric and thread for the quilting, tape and thread for the border, and film for the packing, and the factory that maps the material to the machine stocks the right thing at the right point.
The inventory management keeps the mix uninterrupted, and the management habits of the classification, the contract, the storage and the review turn the stock into the system. The ABC classification is the first habit: the factory classifies the materials by the value and the criticality, the A materials are the high-value and the critical wire and the foam, the B materials are the medium fabric and the film, and the C materials are the cheap thread and the labels, so the factory manages the A by the tight count, the B by the weekly check and the C by the monthly check, and the classification focuses the attention where the risk is. The supplier contract is the second habit: the factory contracts the delivery time and the minimum order with the key suppliers, the contract locks the lead time and the price, and the contracted suppliers deliver on the schedule, so the contract turns the uncertain lead time into the planned delivery. The storage layout is the third habit: the factory stores the material by the family in the labeled racks, the first-in-first-out rotation keeps the old stock moving, and the clean dry storage protects the fabric and the foam, so the storage layout protects the material value and finds the stock in the seconds. The inventory count is the fourth habit: the factory counts the A materials weekly, the B monthly and the C quarterly, the count reconciles the system against the shelf, and the discrepancy is investigated before the stockout, so the count keeps the numbers honest. The review habit is the fifth habit: the factory reviews the reorder points and the buffers quarterly against the consumption and the lead time, the rising consumption raises the reorder point and the longer lead time raises the buffer, and the review keeps the numbers current with the production, so the review closes the loop of the inventory system. The management rule: classify by the ABC, contract the lead time, store by the family, count on the cycle and review the levels quarterly, and the factory that runs the five keeps the mix uninterrupted with the least capital on the shelf.
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