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Choosing a Bottom Seal Machine starts with the bags you intend to sell, not the highest speed on a quotation. Film structure, bag dimensions, gussets, sealing requirements, and collection methods all affect which configuration fits your production plan. This buyer’s guide explains how to compare equipment, calculate realistic output, review quotations, and agree on acceptance testing before purchase. It is written for packaging manufacturers evaluating Chovyting Machinery or another supplier and focuses on evidence you can request rather than assumptions based on model names or general claims.
A bottom seal machine produces a seal across the bottom of a bag using a suitable film presentation, commonly tubular or appropriately prepared folded film. Feeding, sealing, cutting, punching, and collection arrangements vary between models and finished products.
“Bottom seal” identifies the location of a seal. It does not automatically mean a square-bottom bag, a stand-up pouch, or a machine that fills products. Confirm the finished-bag construction before selecting equipment.
Start with Chovyting’s bottom sealing bag making machines and prepare a requirement sheet covering your main product. Additional bag types should be listed separately so the manufacturer can identify which fit the same configuration.
● Provide a finished-bag sample or a dimensioned drawing.
● Specify the film structure, thickness convention, and roll dimensions.
● Define the bag width, length, gusset, opening, and finishing requirements.
● State the required quantity per shift and normal batch size.
● Identify whether bags are plain or printed and how they must be collected.
A machine recommendation should connect the incoming film with the finished bag. Ask the supplier to explain where the bag sides, opening, bottom seal, and cut are formed.
Applications can include flat bags, liners, or other bottom-sealed products, subject to the particular equipment and material. Handle punching, perforation, roll production, or specialized collection may require different configurations or another production route.
If your product has side gussets, identify the folded geometry and how many layers pass through the sealing area. If you require printed bags, include the artwork repeat and registration requirements.
A useful confirmation is a simple drawing showing the film path and finished-bag dimensions. This is more reliable than assuming that two suppliers use “bag width” or “bag length” in exactly the same way.
Material compatibility cannot be established from the word “plastic” alone. Even films within the same polymer family can behave differently because of blends, additives, recycled content, thickness variation, and winding quality.
Provide the actual material specification and sample. Ask the manufacturer to confirm feeding, sealing, cutting, and finished-bag performance at the required production conditions.
A specification may refer to one wall of film or to several layers measured together. These are not interchangeable. Gusseted areas can contain more layers than the central part of the bag, creating a different sealing requirement.
State thickness in microns or another explicit unit and identify the measurement convention. One mil equals 25.4 microns; a mil is not a millimeter.
● Confirm the minimum and maximum film thickness for the proposed application.
● Identify the layer stack at the bottom seal, including gussets.
● Check roll width, outside diameter, core dimensions, and maximum roll weight.
● Ask whether the actual film will be used during acceptance testing.
A published maximum thickness is not proof that every film at that thickness will seal acceptably at maximum speed. Material, product, and speed need to be assessed together.
Finished bag width, incoming film width, and total machine working width describe different dimensions. Their relationship depends on the film presentation, gusset, clearances, and lane arrangement.
For multi-lane production, ask for a layout showing the proposed bags across the machine. A maximum lane count does not guarantee that your widest product can use every lane.
Chovyting lists the CW-1100BS5 multi-line bottom sealing machine. Its published maximum lane capability should be evaluated against your bag dimensions, required accessories, and intended operating arrangement.
● Confirm the usable bag dimensions for each proposed lane setup.
● Ask whether lanes must share length, speed, or other settings.
● Verify whether plain and printed products have different operating limits.
● Record any tooling, guide, or collection changes required between products.
Do not assume that “multi-line” means independently controlled lanes or simultaneous production of unrelated bag specifications.
Send Chovyting Machinery your bag sample, film thickness, gusset details, and target output. Ask for a recommended configuration and a confirmed lane layout before comparing prices.
The bottom seal must meet the agreed product requirement. Its performance depends on the film, sealing surfaces, temperature, pressure, contact time, cooling conditions, and cleanliness.
There is no universal sealing temperature suitable for every Bottom Seal Machine and film combination. Increasing temperature is not automatically the correct response to a weak seal; excessive heat can damage or distort the material.
Ask the supplier to demonstrate acceptable sealing across the intended product range, including the most demanding layer arrangement where relevant.
● Define the acceptable seal appearance and position.
● Agree on dimensional tolerances and the inspection method.
● Specify seal-strength, leak, or load checks where your product requires them.
● Identify sampling frequency and acceptance limits before testing.
A bottom seal is not automatically stronger than every alternative bag construction. Finished-bag performance must be evaluated against the actual use, material, and agreed test method.
Automatic equipment can coordinate operations, but the word “automatic” does not describe the complete labor requirement. Operators may still load film, inspect bags, adjust guides, remove stacks, or pack finished products.
Review each operation separately. Ask which functions are included, optional, manual, or outside the supply scope.
| Function | What to verify | Why it matters |
|---|---|---|
| Feeding and tension | Control arrangement and compatible roll specifications | Influences film stability and dimensional consistency |
| Sealing and cutting | Adjustment method and material-specific performance | Determines acceptable finished-bag quality |
| Print registration | Included sensor and registration capability | Relevant when processing preprinted film |
| Punching and finishing | Included tooling, optional units, and product limits | Prevents missing functions in the quotation |
| Counting and collection | Required count, removal method, and sustained operation | Helps identify downstream handling constraints |
For a particular finishing application, Chovyting also lists the CW-1100BS5+AP calendar bag making machine. Use the model-specific proposal to confirm the required punching and finishing arrangements rather than assuming they are standard across all bottom seal equipment.
Size the equipment around accepted bags per shift, not an unexplained speed figure. This manual worksheet shows how operating time, cycle rate, bags per cycle, and rejects affect output.
| Input | What to use | Illustrative value |
|---|---|---|
| Required accepted bags | Your actual shift target | 80,000 bags |
| Planned production time | Time intended for production | 450 minutes |
| Stop time | Stops within that time, including relevant setups | 50 minutes |
| Average running rate | Cycles per minute during the remaining run time | 100 cycles/minute |
| Bags per cycle | Total bags across the active configuration | 2 bags |
| Reject rate | Rejected bags divided by total bags produced | 2% |
Run time = planned production time − stop time.
Estimated accepted bags = run time × average cycles per minute × bags per cycle × (1 − reject rate).
Example: (450 − 50) × 100 × 2 × 0.98 = 78,400 accepted bags.
Against an 80,000-bag target, the estimated shortfall is 1,600 bags. The configuration should not be treated as sufficient without reviewing the assumptions and the available production options.
Required average cycles per minute = target accepted bags ÷ [run time × bags per cycle × (1 − reject rate)].
Planning limits: these figures are illustrative, not Chovyting specifications. Do not multiply by lane count again if the rate already represents total bags per minute. For different products or lane arrangements, calculate each segment separately. Check collection, packing, and material availability as additional constraints.
A lower machine price may exclude functions or services included in another offer. Compare quotations against the same bag specification and acceptance conditions.
● Base machine, required options, and tooling.
● Recommended initial spares and wear parts.
● Test materials, inspection scope, and factory acceptance arrangements.
● Packing, delivery responsibilities, and transport-related costs.
● Installation, training, and any travel or local support charges.
● Warranty scope, exclusions, and parts-supply arrangements.
Obtain the installation layout and utility requirements before ordering. Confirm voltage, frequency, phase, connected load, compressed air where applicable, unloading access, roll-loading space, and maintenance clearance.
Use qualified local advisers to review destination compliance and installation requirements. General promotional certification statements should not replace the documents relevant to the actual machine and destination.
A factory acceptance test, or FAT, should establish whether the quoted configuration meets the agreed requirements before shipment. Define the scope early enough for both parties to prepare the correct film, tooling, and inspection methods.
● Identify the film specification, bag drawings, and representative products.
● Agree on lane configuration, staffing, test duration, and output definitions.
● Record total bags, accepted bags, rejects, and interruptions.
● Check seal quality, dimensions, printing alignment, and finishing as applicable.
● Demonstrate counting, collection, and representative changeovers.
● Document deviations, corrective actions, and any retest requirements.
A running video can support the record, but it should not replace agreed acceptance criteria. If travel is impractical, discuss remote witnessing or a suitably scoped independent inspection.
Chovyting Machinery publishes information about installation, commissioning, training, and maintenance support. Confirm the project-specific scope so the handover plan extends beyond dispatching the machine.
It forms a seal at the bottom of a bag using a compatible film presentation and processing arrangement. The exact products depend on the configuration. Ask the supplier to confirm the incoming film, finished construction, and required finishing operations.
No. Bottom sealing describes the position of a seal. A square-bottom bag requires a particular formed construction. Do not select equipment from the word “bottom” alone; provide a finished-bag sample or drawing.
Some configurations are suitable for specified polyethylene films, but compatibility must be confirmed for the actual material, thickness, additives, and bag design. Request testing with representative film rather than relying on the polymer name alone.
Use the finished bag dimensions, usable machine width, required tooling, and output target. Ask for a lane layout and confirm shared operating limits. A model’s maximum lane count does not apply automatically to every bag size.
There is no universal temperature. It depends on the film, layer stack, sealing system, pressure, contact time, cooling, and operating rate. Establish settings through controlled trials and verify the finished seal against agreed requirements.
No. Material formulation, film quality, bag construction, seal performance, and the intended load also matter. Evaluate the finished product using the required test method instead of assuming thickness alone determines suitability.
Request model-specific instructions for sealing surfaces, cutters, guides, sensors, drives, lubrication, and safety systems. Also obtain wear-part identification, replacement procedures, and recommended spares. Maintenance intervals should follow the machine instructions and actual operating conditions.
Provide bag samples or drawings, film specifications, thickness convention, dimensions, gusset details, printing and finishing requirements, production targets, available utilities, and destination. Identify your main product separately from possible future applications.
Share your bag requirements, production target, and factory conditions with Chovyting Machinery. Ask for a recommended configuration, required options, and a sample-based acceptance plan.
● Bottom Sealing Bag Making Machines — Explore the relevant product category before preparing a quotation request.
● CW-1100BS5 High Speed Bottom Sealing Bag Making Machine — Review the model associated with multi-line bottom sealing applications.
● How to Define Film Thickness for a Bottom Seal Machine Quotation
● How to Compare Bottom Seal Machine Lane Layouts for Different Bag Sizes
● What to Include in a Bottom Sealing Machine Factory Acceptance Test
A Bottom Seal Machine should be selected against a defined bag, material, production target, and acceptance plan. Confirm the construction first, clarify thickness and width conventions, and calculate output using realistic running time and accepted bags. Then compare complete quotations, installation requirements, and support responsibilities. Chovyting Machinery can review your samples and specifications to discuss a suitable configuration. The strongest purchase decision is not based on the largest speed figure or longest feature list, but on evidence that the proposed equipment can produce your required bags under agreed operating conditions.
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