Solution topic
Sealing routes for special-shaped cups, boxes and bottles: rim and lid film structure determine the main machine
Compare heat sealing, induction foil sealing and cap pressing routes based on the rim, film and cap structure of special-shaped cups, boxes and bottles, and explain the container a
- Square cups, multi-compartment boxes and special-shaped bottles may correspond to heat sealing, induction or cap pressing processes. Equipment cannot be applied only by container name. Please provide actual containers, rim dimensions, film or cap samples, target capacity and downstream marking requirements.
Solution summary prepared for you
- Irregular cups, boxes, and bottles cannot be directly matched to equipment by appearance name; the opening structure and sealing material are the route entry points.
- Square cups can undergo heat-seal trial sealing when dimensions and rim fall within the SGP-03 adaptation range; multi-compartment trays should be evaluated with production film as a complete set.
- For bottles and jars that are directly film-sealed and then pressed with an outer cap, use the paper can/plastic pail aluminum foil film sealing and press capping machine to verify the process.
Route comparison
- Irregular cups and trays where the rim can be supported by the mold and sealed with roll film or pre-cut film heat sealing.
- The heat-seal route can create support and molds around the actual rim, making it easy to observe sealing edge status zone by zone.
- Equipment adaptation range, rim flatness, box heat resistance, and production film material all require physical testing.
- If the opening cannot be stably supported, or the film heat-seal layer does not match the container, do not proceed to a batch solution.
- For small specifications, first use the small-diameter cup sealing machine SGP-03 for sampling. For multi-compartment trays, use the tabletop multi-compartment meal box sealing machine to verify film width, heat-seal layer, film supply m...
- Can packaging where the opening is first heat-sealed with aluminum foil film and then pressed with a plastic or metal outer cap.
- Film sealing and outer cap pressing can be connected in a fixed process, making it easy to verify the respective functions of inner seal and outer cap.
- Only for bottle and jar structures that are directly film-sealed and then pressed with an outer cap; film feeding and cap pressing must be configured according to the actual product.
- If the aluminum foil is inside the threaded cap, or the outer cap needs to be screwed rather than pressed, re-evaluate the closing process.
- Use the paper can/plastic pail aluminum foil film sealing and press capping machine to make a complete set of samples for the can mouth, aluminum foil film, and outer cap.
- Plastic or glass special-shaped bottles that are already capped and tightened, with a matching aluminum foil liner inside the cap.
- The induction head does not press directly against the bottle mouth and can be connected after a bottling process where caps are already tightened.
- The container must pass through the equipment, the aluminum foil liner inside the cap must press against the bottle mouth, and the sealing result is determined by sample testing.
- When there is no aluminum foil liner inside the cap, the container material does not match, or the bottle conveying posture is unstable, the induction process is not used.
- Before using an induction foil sealing machine, verify material matching and passing posture with production bottles, caps and liners.
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Core process
First classify cups, boxes, and bottles by sealing contact surface, then check whether the rim is flat, whether there is a cap liner, and how the outer cap closes.
The small-diameter cup sealing machine SGP-03 is only used for actual sample adaptation tests; multi-compartment or irregular trays are evaluated by the tabletop multi-compartment meal box sealing machine based on box and film combinations.
If bottles or jars require heat-sealing aluminum foil film on the rim and then pressing an outer cap, use the paper can/plastic pail aluminum foil film sealing and press capping machine for complete sample testing.
Irregular bottles are evaluated for the induction aluminum foil sealing machine only when the container can pass through the induction head stably, the cap liner matches, and the cap is tightened.
After the main sealing solution completes sampling, arrange downstream sections according to batch code position and weight check method to avoid codes being blocked by caps or labels.
Submit actual cups, boxes, bottles, key opening dimensions, film or lid samples, filling state, and target rhythm to clearly define the trial sealing scope and downstream interface.
Sample details
Front, side, and opening close-ups can first identify the support surface, irregular protrusions, and sealing contact surface.
Actual photos of each cup, box, or bottle and their posture after fillingLength, width, mouth diameter, rim width, and total height are used to verify the inlet/outlet space and mold boundaries.
Container dimension drawing and opening local dimensionsFilm rolls, pre-cut films, outer caps, and cap liners should be sent in actual combinations; do not substitute similar materials.
Production film, lid, and liner samplesWeight distribution after filling and outer wall cleanliness affect support, conveying, and pre-sealing inspection.
Content state, single-piece fill weight, and target production rhythmClarify the readable surface of the batch code, weight judgment position, and front and rear equipment heights to arrange post-sealing processes.
Batch code printing position, weight check method, front and rear equipment heights, and on-site connection diagramCommon selection mistakes
Oval and square are only contour descriptions and cannot replace judgment of the rim, film cap, and closing action.
Film covering the opening does not mean the heat-seal layer, film width, and film supply method match the equipment.
The liner inside the cap must be pressed by the cap onto the bottle mouth, and the container material and passing height also need to be tested.
If there are height differences between compartments, a single flat mold may have insufficient local pressure.
When the main machine has not yet formed a stable discharge posture, connecting downstream sections leads to repeated adjustments in printing and weighing.
View detailed technical notes
Do not be misled by the shape name first
Square cups, multi-compartment boxes and flat bottles all look like non-round containers, but they do not share one sealing principle. First separate the film, lid and rim structure at the opening to find the main machine to be verified.
Divide routes by the sealing contact surface
The first step is to determine where the sealing material is placed. If the film sits directly on the cup or box rim, it usually goes to heat sealing trials. If the aluminum foil is inside a threaded cap, cap first and then evaluate induction. If the can mouth has a separate film and an outer cap later, check the film sealing and cap pressing combination.
Cups and multi-compartment boxes: check rim support
For special-shaped cups, first confirm whether the bottom can be stably supported, then check the rim width and height difference. When the size falls within the SGP-03 adaptation range, use the container and production film for small-scale sealing trials. For multi-compartment boxes, use a tabletop multi-compartment meal box sealing machine with the corresponding mold, and observe the outer edge and partition sealing edges one by one.
For direct film sealing, distinguish the outer cap action
Some bottles and cans have aluminum foil film laid directly at the opening, heat sealed, and then an outer cap added. This structure can be tested with a paper can/plastic pail aluminum foil film sealing and cap pressing machine. If the cap needs to be screwed on, or the film is not placed directly on the can mouth, the equipment actions must be split separately.
Induction sealing for bottles is not only about contour
The outer contour of special-shaped bottles mainly affects conveying and the passage space for the induction head. Whether induction sealing can be used must also be judged by the flatness of the bottle mouth, container material, aluminum foil liner inside the cap, and tightening state. Finally, use production bottle caps and liners for post-sealing inspection.
Use post-sealing samples to locate problems
During trials, record the film surface, peel state, each sealing edge and container deformation. If partial non-sealing occurs, return to the rim height, mold force or heat seal layer for troubleshooting, rather than only increasing process settings.
Organize changeovers by sealing structure
When the same project has multiple specifications, first divide groups that can share conveying and heating processes, then list the molds and support parts that must be changed. This makes changeover work clear and helps arrange the trial order.
Downstream follows the finished product posture
Date and batch codes should be placed where they can still be read after sealing. The online checkweigher should be arranged according to the discharge spacing and container center of gravity. Both should be commissioned together after the main sealing process is stable.
Prepare the three types of samples separately
When discussing the solution, bring each container, production film and cap, key dimensions, filling state, target cycle time and downstream requirements. Archive materials by cup, box and bottle separately to form their own trial sealing checklists faster.
Common questions
Can the sealing method be determined from a container photo alone?
First check the sealing contact surface. For cups and boxes, usually verify the rim and heat-seal film; for bottles with threaded caps, check whether the cap has an aluminum foil liner inside; for bottles and jars that are directly film-sealed and then capped, follow the film sealing and press capping process.
Can a square small cup be sampled with the SGP-03?
The SGP-03 can be used for trial sealing of actual samples that fall within its container and rim adaptation range. For multi-compartment or larger irregular trays, use a tabletop multi-compartment meal box sealing machine with box film testing.
Why should multi-compartment meal boxes be tested with the film?
Check the rim height, support position, film width, and heat-seal layer of each compartment together, and finally confirm with a complete trial sealing of the production box and film set.
Can induction sealing be done on irregular bottles with threaded caps?
Also verify the container material, aluminum foil liner inside the cap, bottle mouth flatness, tightening state, and whether the bottle body can pass through the induction head smoothly.
How to distinguish between heat-seal film and induction processes for canned products?
First compare the direct film lidding structure on the rim with the liner structure inside the cap. The former can be evaluated for a film sealing and press capping machine; the latter for induction equipment when packaging materials and passing dimensions match.
How to plan a common line for multiple irregular containers?
First complete sealing samples for each specification, then verify mold change steps, printing position, and checkweighing rhythm. If specifications differ greatly, set up separate stations.