Adult & Baby Diaper Machine,Sanitary Napkins Production Line Blog
Use a buyer focused size changeover check for infant diaper making machines, covering tooling, webs, recipes, startup waste, timing, and quality release.
Buyers checking size changeover on an infant diaper making machine should measure the complete path from the last accepted old-size diaper to the first approved new-size diaper. The review must cover change parts, web positions, core dimensions, elastic and tape placement, cutter phase, folding, recipes, packaging, startup waste, and quality release. Ask the supplier to demonstrate a representative change between two contracted sizes with named operators, normal tools, approved materials, and no hidden pre-adjustment. Record mechanical time, threading time, tuning time, and approval time separately so the result reflects real production loss.
Set the Changeover Boundary and Clock
A changeover time is meaningless until its start and finish are defined. A practical start is the last product of the old size that passes the agreed quality checks. A practical finish is the first consecutive group of new-size products released by quality, not the first piece that leaves the cutter. Include safe stopping, cleaning, tooling, material movement, threading, recipe selection, startup, adjustment, sampling, and approval.
State what is outside the measurement. A planned maintenance task, repair of an existing fault, warehouse delay, or unavailable quality technician may need separate recording. Do not quietly remove normal cleaning, guard opening, or verification from the changeover. These are real tasks required for safe repeatable production.
Identify the people in the demonstration. Record the number and roles of operators, technicians, material handlers, and quality inspectors. A supplier specialist using several extra people can establish the technical method, but it may not represent the staffing planned at the buyer's factory. Repeat the method with the intended team during training or site acceptance.
Measurement note: Report total elapsed time and its stages. A single number hides whether improvement should focus on tools, materials, recipes, startup stability, or quality release.
Map Every Size Dependent Station
Create a size-impact sheet from the approved product drawings. Compare finished length and width, absorbent core dimensions, cuff position, leg elastic path, waist elastic, frontal tape, side tapes, release material, backsheet cut, fold dimensions, stack count, and bag format. Mark each station as unchanged, recipe adjusted, manually adjusted, repositioned, or physically replaced.
Follow the process in machine direction. Core-forming drums or inserts may affect absorbent dimensions. Guides and applicators may move when material widths change. Elastic and cuff positions may need indexed adjustment. Tape length or placement can change. Cut-off phase, final folding, product turning, counting, and stacking can require separate settings. The line supplier should explain the dependency between upstream and downstream changes.
Check the most difficult planned transition, not only two adjacent middle sizes. A larger step can expose travel limits, web-width changes, different change parts, longer threading, and packaging constraints. If the full size range cannot be demonstrated at FAT, list the untested transitions and assign a site verification method.
A station map prevents a size dependent adjustment from being missed during planning.
Inspect Change Parts Tools and Identification
Every removable part should have a stable identifier tied to product size, station, drawing, and storage position. Inspect forming components, cutters, folding plates, guides, spacers, vacuum parts, applicator fixtures, stacker parts, and any packaging tooling. A box labeled for one size is not enough when similar parts can be installed in the wrong station.
Review handling risk. Large, sharp, hot, heavy, or accurately aligned parts may need lifting points, carts, covers, locking devices, or alignment gauges. Confirm that guards and neighboring modules allow removal without disassembling unrelated equipment. Tooling should be cleaned and inspected before storage so damage is found before the next scheduled run.
List normal tools and torque requirements. Mark adjustment points and final positions with scales, stops, gauges, or documented measurements where possible. Avoid depending on unrecorded specialist judgment. If one alignment requires a skilled technician, include that skill in staffing and training plans rather than describing the change as operator-only.
Change-part control sheet
Part identifier matches the size matrix, drawing, station, and recipe.
Condition, cleanliness, wear surfaces, and fasteners are inspected.
Required tool, torque, gauge, lifting method, and safe position are listed.
Removed and installed parts are checked by named responsible roles.
Protected storage prevents corrosion, impact, mixing, and lost fasteners.
Any common part is clearly distinguished from size-specific tooling.
Reset Web Positions and Material Feeding
A size change may include new roll widths, different components, or changed web centerlines. The procedure should name which rolls remain loaded, which are replaced, how unused material is identified, and how winding direction and splice preparation are checked. Material staging and lifting time should be included when those tasks occur during normal production.
Document guide positions, sensor positions, edge references, tension zones, dancer settings, unwind brake or drive settings, and web paths. Wider or narrower materials can respond differently to tension and air handling. A recipe value cannot compensate for a mechanically misplaced roll or guide. Use reference marks and measured positions rather than visual approximation.
Threading should follow a controlled path with safe access. Inspect contact surfaces for adhesive, dust, damaged coating, and sharp edges before the new web enters. Confirm that splicing devices, low-material alarms, and web guiding are ready for the changed roll. Keep scrap from trial threading separate from good material and identify the reason for the loss.
Roll location, guide position, tension, and threading are part of the complete changeover.
Control Recipes and Manual Settings
Each approved size should have a controlled recipe name and revision. Define who can create, edit, approve, back up, and restore recipes. Before loading, operators should confirm product code, tooling state, material widths, and packaging format. A recipe should not be selected merely because its name resembles the planned product.
Separate values transferred automatically from positions adjusted by hand. Servo phase, electronic cam, registration, length, speed ratio, alarm limit, adhesive timing, and rejection windows may be recipe controlled. Guides, applicators, sensors, tension hardware, and folding elements may still need physical positioning. The procedure should show both sets of actions in the correct order.
Protect master values from routine tuning. If an operator changes a setting during startup, record the old value, new value, reason, sample result, and whether the approved recipe will be updated. Uncontrolled edits produce different results on the next shift and make repeatability impossible to assess.
Release the First New Size Products
The line should restart at a controlled condition defined by the supplier's procedure. Inspect web tracking, core formation, component registration, adhesive application, elastic position, tape placement, cutting, folding, rejection, and discharge before raising speed. Do not use the speed display as evidence that the new size is ready.
Prepare a first-piece approval sheet tied to the product drawing. It can include finished dimensions, core position, cuff geometry, elastic placement, tape function, bond appearance, weight checks where specified, folding, count, and package condition. The buyer should define the sampling method and tolerance in the approved quality plan rather than improvising during the demonstration.
Keep startup samples in sequence and mark adjustment times. This shows which correction changed the result and how much material was consumed before release. A stable set of consecutive accepted products is stronger evidence than one selected good sample. Confirm that inspection and rejection recipes were also changed for the new dimensions.
Changeover ends only after the new product passes controlled quality release.
Measure Time Waste and Repeatability
Changeover stage
Start and finish evidence
Waste category
Improvement question
Safe stop and clean
Last accepted old-size product to released work area
Remaining web and cleaning discard
Can shutdown and material runout be planned better?
Mechanical conversion
Tooling checklist and independent position check
Damaged or contaminated components
Are identification, access, tools, and storage adequate?
Material reset
Roll and threading sheet completed
Threading and splice material
Can staging, reference marks, or preparation move offline?
Recipe and startup
Correct recipe loaded to first moving product
Startup pieces and known challenge samples
Are settings controlled and initial speed appropriate?
Quality release
First sample to signed consecutive accepted group
Out-of-specification trial products
Are checks, tools, limits, and decision roles ready?
Record elapsed time and product or material waste for each stage using agreed boundaries. Compare repeated demonstrations under similar conditions. One unusually fast trial may depend on pre-positioned materials, warm adhesive, hidden adjustments, or expert labor. Repeatability is more valuable for planning than a record attempt.
Use the data to move preparation outside the stopped period when safe: stage verified rolls, inspect tooling, prepare documents, confirm recipes, and ready measurement tools. Do not reduce time by skipping isolation, cleaning, torque, guard checks, or quality approval. Improvement should remove waiting and uncertainty, not controls.
Run a Buyer Witnessed Changeover Demonstration
Write the demonstration protocol before FAT. Name the starting and ending sizes, materials, machine condition, packaging boundary, people, allowed preparation, time points, samples, and acceptance records. The supplier should disclose adjustments completed before the clock. The buyer should witness settings and preserve the completed checklist.
During project review, HAINA can map the contracted size range for an infant diaper making machine to affected process stations and planned FAT checks. Final changeover conditions should be based on the buyer's approved product construction and materials, because a different tape system, web width, core, or package can change the work.
After the first demonstration, switch back or repeat another transition if risk justifies it. Verify that all tools and parts are accounted for, recipes are backed up, and documentation reflects the demonstrated method. Open findings should identify owner, date, corrective action, and retest evidence. Include the procedure in operator training and site acceptance.
A witnessed trial verifies the complete method under declared preparation conditions.
Size Changeover FAQ
Should changeover time include quality approval?
Yes, when the business needs time to resume sellable production. Report mechanical work and quality-release time separately so delays can be improved correctly.
Can recipes make a size change fully automatic?
Recipes can control many electronic settings, but material widths, rolls, tooling, guides, sensors, cleaning, threading, packaging, and quality checks may still require physical work.
Which two sizes should be used for the FAT demonstration?
Select a contracted transition that represents meaningful changes in width, length, components, tooling, and packing rather than the easiest adjacent sizes.
How can buyers compare changeover claims from suppliers?
Give every supplier the same start and finish boundaries, size pair, staffing basis, preparation rules, materials, quality release, and required evidence.
Conclusion
A credible infant diaper machine changeover check follows the whole production interruption. Map size-dependent stations, control tooling and materials, distinguish recipes from manual settings, and end with approved new-size output. Measure stage times, waste categories, staffing, and repeatability under declared conditions. A buyer-witnessed demonstration turns a broad changeover claim into evidence that can support capacity planning, training, maintenance, and future product launches.
