In this guide
Wrapping a carton in clear film involves more than adding heat. Film sealing, controlled shrinkage and the product’s response to heat all affect the finished pack. A product that fits inside a machine may still be difficult to wrap consistently. Start with the pack you need, then assess the complete process.
Check four things first: the required pack format, the film’s suitability for both sealing and shrinking, the complete pack dimensions at every stage, and the quality and output achieved with actual samples.
01 / Define the finished pack
For a film overwrap around one carton or a group of products, compare sealing and shrink wrapping equipment. A shrink sleeve around a bottle, a tamper-evident band around a cap and a pallet-stabilizing wrap are different requirements. The word “shrink” alone does not identify the right machine.
| Packaging goal | What to specify |
|---|---|
| Individual overwrap | Whether the product is already boxed, the intended film coverage, seal position and appearance. |
| Multipack | Units per pack, arrangement, tray requirements and whether the group remains stable during transfer. |
| Bottle sleeve or cap band | Sleeve or band shape, position and actual samples, for a separate process assessment. |
Provide a picture of the desired result and identify what matters: seal position, film appearance or group stability. A complete film overwrap does not establish validated airtightness, moisture protection or shelf life. Define and verify those requirements separately.
02 / Separate sealing from shrinking
The sealing stage encloses the product and seals and cuts the film according to the chosen arrangement. The shrinking stage applies controlled heat to tighten suitable shrink film. A separate tunnel does not automatically load film, seal it and cut it.
Chamber combination machine
Sealing and shrinking take place in one machine. When assessing a standalone workstation, include loading, closing the hood, the complete cycle and unloading. Heating time alone is not the workstation’s cycle time.
Separate sealer and tunnel
Check each machine’s working range, then confirm the transfer method, conveyor heights and speed coordination. Manual, semi-automatic and automatic sealing arrangements also change staffing and loading requirements.
Automatic transfer is not automatic grouping
A carton that travels easily on a conveyor is different from several loose items that must be counted and arranged. List grouping, orientation and tray loading separately if these actions are part of the required line.
03 / Identify the film before choosing settings
POF, PVC and PE are material categories you may encounter when selecting shrink packaging. The category alone does not specify a film grade, thickness, structure or shrink behavior. Compatibility on one machine does not establish compatibility on every sealer or tunnel.
| Film information | Why it matters |
|---|---|
| Material, grade and technical specifications | Establish the actual film’s sealing, shrink and use conditions rather than specifying only “clear film.” |
| Thickness, roll width and film format | Centerfold, single-wound and other formats need suitable feeding and sealing arrangements. Carton width alone does not determine roll width. |
| Core, outside roll diameter and unwind direction | Confirm roll mounting and the intended film path. |
| Appearance and intended use | Define clarity, seal appearance, group stability and subsequent handling, then compare actual samples. |
Begin trials within the film’s specified conditions and the machine instructions. Evaluate the seal and shrink results before adjusting the process. There is no universal temperature: exposure time, conveyor speed, airflow, film thickness and the product all matter. For food, cosmetic or similar applications, verify material suitability for the actual contact and use conditions.
04 / Measure the complete pack
Measure the pack as it enters the equipment, including trays, projections, overhanging edges and gaps within a group. For multipacks, measure the complete arrangement rather than one item. A photograph marked with the feed direction is more useful than three unlabelled numbers.
Sealing range: height also uses wrapping space
The length and width of a sealing frame are not universal maximum product dimensions. Product height, the film path, seal allowance and orientation affect the usable range. Apply the selected model’s sizing method, then verify it with samples; do not assume one formula works for every machine.
Tunnel size: the chamber is not the usable pack envelope
The pack must travel steadily with the passage and hot-air clearances required by the equipment. Check entrances, curtains, conveyor support and the complete passage, as well as the chamber width and height.
Equal dimensions can require different handling
A lightweight empty carton, a heavy product and a loose multipack behave differently during transfer and heating. Record pack weight, base shape, balance and acceptable heat exposure. Check tipping risk for tall, narrow packs.
05 / Plan around accepted packs
Output depends on loading, arrangement, sealing, tunnel transfer, cooling, unloading and inspection working together. Conveyor speed is not a pack-per-minute rating. Pack length, spacing, heating dwell time and upstream supply all affect the result.
Turn a production target into a trial requirement
Suppose a batch requires 800 packs in a four-hour window, with 40 minutes allocated to preparation, roll changes and inspection. That leaves 200 minutes for continuous production.
800 ÷ 200 = 4 packs/minute
This is a planning example, not a capacity claim for any model. Check sustained accepted output in a trial and allow for the actual changeovers, interruptions and staffing arrangement.
Record operators, stable running time, accepted quantity, film waste and rework. If formats change often, compare the adjustment procedure, first-pack checks and time to restore stable production. One attractive sample does not demonstrate batch output.
06 / Compare three equipment roles
These models illustrate different process roles: a combination machine, a sealer and a tunnel. They are not presented as a prevalidated matching line. Any separate-machine pairing still needs checks for film, dimensions, transfer and production rate.
| Existing model | Role and selection checks |
|---|---|
| DFM5540 combination machine ↗ | Combines film sealing and shrinking. Check the complete pack size, operator cycle and accepted output. |
| DQL5545PEG automatic L-sealer ↗ | For PE-film sealing. Assess suitable shrink equipment for the application and verify the exact film specification. |
| DSA4525 shrink tunnel ↗ | A conveyor tunnel for packages already enclosed and sealed in film. Check passage, conveyor load and actual shrink results. |
Include the site power supply, available space, adjacent processes and staffing in the inquiry. Confirm whether the quotation covers the required sealing, shrinking, transfer and supporting components. Prices are comparable only when the required scope is clear.
07 / Inspect before heat, after cooling and during handling
Use the actual product, carton or tray and intended film. Cover the main formats and the tallest, lightest, least stable or most heat-sensitive packs. Agree acceptance criteria before recording settings and a continuous run.
| Trial stage | What to inspect |
|---|---|
| After sealing, before the tunnel | A continuous, intact seal; no trapped or damaged film; stable product position and seal allowance. |
| After shrinking and cooling as instructed | Unacceptable loose film, wrinkles, holes or splits; opened seals; distorted cartons or containers. |
| Intended handling and group retention | Film and seal behavior during normal handling; movement within multipacks. Appearance alone does not validate carrying strength. |
| Continuous running and format changes | Accepted quantity, elapsed time, film use, stoppage reasons and first-pack approval after a changeover. |
When a defect appears, establish whether it starts before sealing, during sealing or after heating. Then investigate the relevant film, seal, transfer and heating conditions. Simply raising the temperature is not a universal answer to loose film. Keep representative samples and a continuous process video for review.
Common buying questions
Can a shrink tunnel wrap an unpackaged product by itself?
A conventional conveyor tunnel applies heat; it does not automatically provide the complete film-feeding, wrapping and sealing process. It needs a suitable upstream sealing or prewrapping arrangement, or you can assess a combined solution.
Can POF, PVC and PE films be used interchangeably?
Do not assume so. Check the exact film’s sealing and shrink conditions, the equipment range and the packaging goal, then run samples. Grades and thicknesses within one material category are not automatically interchangeable.
Will a product work if it is smaller than the tunnel opening?
That check alone is insufficient. Also assess sealing range, the full passage, required clearances, conveyor load, stability and acceptable heat exposure.
Should I choose an automatic machine immediately?
Compare automation when loading, format consistency and continuous production needs support it. Include changeover frequency, manual arrangement, actual cycle time and complete equipment scope; there is no universal daily-volume threshold.
Can heat-sensitive products be shrink wrapped?
Define acceptable exposure for the product, contents, container and labels first. Evaluate film and process conditions with actual samples. Consider another packaging method if the requirements cannot be met.
Share the pack. Narrow down the options.
Send RUIKE product photographs, the intended finished appearance and actual film information to help define equipment options and useful sample checks.
Product and packaging application: Individual wrap or multipack, arrangement and tray: Complete pack L × W × H, feed direction and pack weight: Acceptable heat exposure for the product, container and contents: Film material, grade, thickness, roll width and format: Core, roll diameter and unwind direction: Finished-pack photos, seal position and appearance requirements: Batch quantity, available hours, formats and changeover frequency: Power supply, space and adjacent processes: Current problems and other requirements:
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