Production guide
Sustainable output is the slowest accepted stage of product presentation, wrapping, sealing, shrinking, cooling and discharge.
Output framework
A shrink wrapping line can only run at the rate at which products are presented, wrapped or sealed, heated, cooled and transferred without exceeding the agreed pack-quality limits. Published maximum speeds are useful filters, but accepted line output must be proven with the real format range and normal interruptions.
Upstream equipment must deliver the correct orientation, pitch and stable pack pattern.
Film feed, seal cycle and product clearance must remain repeatable at the intended loading.
The tunnel must maintain the process window through steady loading, gaps and restarts.
The accepted pack must leave without distortion, accumulation damage or downstream blockage.
| Constraint | Evidence to record | Reason it can limit output |
|---|---|---|
| Product presentation | Orientation, spacing, group stability, missed products and recovery | An unstable or irregular infeed causes stops and poor film placement |
| Sealing cycle | Seal condition, film tension, trim, jaw clearance and accepted cycle under load | A faster cycle is unusable if the seal weakens or the product position varies |
| Tunnel loading | Actual speed, pack pitch, number in heated zone, airflow and recovery after gaps | Dense loading can move the tunnel outside the approved thermal window |
| Cooling and outfeed | Pack temperature/condition, support, accumulation and next process | Warm film can distort when it is guided, compressed or stacked too soon |
| Changeover and intervention | Adjustment time, first-off approval, film change, fault clearing and restart | Daily output includes planned and normal unplanned losses, not only run time |
Production questions
The accepted rate should be expressed for a defined product, film, pack pattern and process condition.
The rate is determined by the slowest accepted stage: product presentation, grouping, film feed, sealing, tunnel exposure, cooling, discharge or downstream handling. Product size, weight, stability, film, changeover and normal stops can all change the result.
State whether the target is instantaneous, sustained, hourly or shift output and define what counts as an accepted pack.
A published maximum is usually associated with stated machine conditions. Sustained output includes the real product range, loading, film, accepted quality, replenishment, stops, restarts, changeovers and downstream capacity.
The trial should reproduce the intended production condition long enough to show thermal stability, recovery and operator practicality.
Spacing changes the number of packs in the heated zone and the airflow available around each pack. Closer loading can increase thermal demand or obstruct air circulation, while wide spacing may reduce throughput.
Record pack pitch with the accepted recipe. A tunnel setting tested at occasional single-pack loading may not be valid at production density.
Not necessarily. If the sealer is the line constraint, increasing tunnel speed does not create more accepted packs and may reduce dwell time below the film’s process requirement. Likewise, a faster sealer can overload a tunnel or cooling section.
Balance the complete line around the accepted rate and use accumulation only where its purpose and capacity are defined.
Daily output includes stopping, safe adjustment, film or format changes, first-off inspection and release of the new recipe. A machine with a high running rate can deliver less per shift if changeovers are frequent or difficult to verify.
Measure the expected product mix and number of changes, not only the fastest SKU.
Provide every product and pack pattern, production film, target sustained rate, upstream delivery pattern, normal gaps, operator method, changeover frequency and downstream capacity. Include the acceptance defects that must not occur.
Representative samples and a line sequence or layout allow the rate to be tested against the actual process rather than a generic cycle.
Assess each format family under its own approved film, recipe and loading, then include the planned product mix and changeover losses. Do not average unrelated best-case speeds into one line promise.
The proposal should identify the rate-limiting format and any product that needs a separate route or additional change parts.
Output review
Send the format list, pack patterns, film, upstream delivery, normal gaps, changeover profile and downstream process so Lancing can identify the likely constraint.