The operator needs to separate sensor contrast and film printing issues from encoder, pull-belt, tension and recipe errors.

Decision intentProblem diagnosis
Capability basisAuthorized brochure and machine data
Reviewed
Editorial method and reference limits
Productsprinted roll film, registered pillow bag, VFFS retail bag
Package formatseye-mark registration, fixed-length bag, printed VFFS film
Decision stageProblem diagnosis
Machine paths3

What the symptom can indicate

01

Low mark contrast or reflective film can create intermittent sensor switching.

02

Film slip at pull belts changes actual travel even when commanded length is correct.

03

Print pitch variation can make a machine appear unstable when the web itself is inconsistent.

Buyer analysis

Verify the printed web first

Measure repeat length across several meters and inspect mark contrast, location and splice quality. Confirm the sensor sees the intended mark and not nearby graphics.

Compare commanded travel with actual film travel

Mark the web and check pull-belt grip, pressure, contamination and encoder coupling. A stable recipe cannot correct intermittent mechanical slip.

Use separate fixed-length and registered tests

Run unprinted film or disable registration where safe to test base bag length, then test eye-mark correction. This isolates motion from optical detection.

Symptom-to-action diagnostic matrix

Observed pattern Evidence to check Controlled next action
Every bag is the same wrong length Recipe length, encoder scaling, forming set Correct base travel calibration
Length varies randomly Film slip, belt pressure, tension Stabilize web traction
Cut drifts by print pitch Eye-mark contrast, sensor position, print repeat Validate optical registration and web printing
Automatic Granular Packing Machine
Vertical form fill seal machines

Automatic Granular Packing Machine

An automatic granular packaging machine for product measurement, feeding, filling, bag making and optional inflation or exhaust in a roll-film packing workflow.

 Full Automatic Electronic Scale Packing Machine
Vertical form fill seal machines

Full Automatic Electronic Scale Packing Machine

A roll-film automatic packing line with electronic scale dosing, film forming, filling, sealing, cutting, date printing and conveying for granular foods.

 Full Automatic Powder VFFS Packing Machine
Vertical form fill seal machines

Full Automatic Powder VFFS Packing Machine

A vertical powder packing machine using auger dosing and roll-film bag making for milk powder, rice flour, milk tea powder, protein powder, seasoning and other powder products.

Brochure-grounded capability references

The rows below connect VFFS Bag Length and Print Mark Troubleshooting to published machine ranges and stated applications. Use them for shortlisting only; final output, accuracy and package quality require testing with the actual product, package material and line conditions.

Machine path Selected brochure reference data
Automatic Granular Packing Machine Process: Measurement, feeding, filling, bag making and sealing; Options: Inflation or exhaust depending on product; Best fit: Granular products needing automatic bag production Stated applications include Granular food, Seeds, Daily chemical granules, Small commodity packs.
Full Automatic Electronic Scale Packing Machine Bag size: L80-450mm and W80-350mm across frame sizes; Reference speed: 10-80 bags/min depending on bag size and dosing; Power: AC220V or AC220V/380V, 3-4kW reference Stated applications include Puffed food, Fruit, Candy, Biscuits.
Full Automatic Powder VFFS Packing Machine Bag size: Frame-dependent roll-film bag range for medium and large powder packs; Dosing: Auger screw filling for powder measurement; Materials: Composite roll films including OPP/PE, PET/PE and foil laminates Stated applications include Milk powder, Protein powder, Rice flour, Milk tea powder.

Specification signals to confirm

Project input Why it changes the decision
Check 01 Exact symptom, first occurrence, frequency and the machine step where it begins.
Check 02 Product, pouch or film lot, SKU, recipe and environmental conditions during the fault.
Check 03 Alarm history, setpoints, actual utility readings and maintenance work completed before the issue.
Check 04 Good and failed samples, time-ordered production data and video of the full cycle at normal speed.

RFQ checklist for this page

A short video showing the complete machine cycle before, during and after the fault.

Photos of good and failed packs with the defect location marked.

Current recipe, setpoints, alarms, line speed and dynamic air or vacuum readings where relevant.

Product, pouch or film samples from both good and failed lots.

Recent change parts, maintenance actions, material changes and the measured reject rate.

From evidence to a machine decision

01

Capture the evidence that changes the decision

A short video showing the complete machine cycle before, during and after the fault. Photos of good and failed packs with the defect location marked.

02

Trace the first process deviation

Automatic Granular Packing Machine, Full Automatic Electronic Scale Packing Machine, Full Automatic Powder VFFS Packing Machine

03

Verify the correction under normal variation

Run the corrected process with normal product, material and utility variation. Confirm reject rate and pack quality before making the new setting a standard.

Related packaging decisions

Troubleshooting

VFFS Film Tracking Troubleshooting

Diagnostic guide for VFFS film tracking problems caused by roll loading, tension, rollers, forming collars, pull belts, registration and material variation.

 Buying guides

Packaging Material Trial Protocol Guide

Guide to packaging material trials for pouch, roll film, sachet film, lidding film and recyclable structures before machine purchase.

 Packaging technologies

Thermal Transfer and Inkjet Coding Packaging Line Guide

Guide to thermal transfer, inkjet coding, date marking, lot codes, 2D codes, verification and reject handling on packaging lines.

 Industry insights

Auger Filler vs Volumetric Cup Packing Guide

Compare auger fillers and volumetric cup dosing for powder, granule and small-dose packaging machines.

 Packaging formats

Gusset Bag VFFS Machine

Gusset bag VFFS machine guide for better shelf shape in roll-film snack, grain, coffee and pet food packs.

 Packaging formats

Pillow Bag VFFS Machine

Pillow bag VFFS machine guide for snacks, rice, granules, powders and roll-film packaging projects.

Send the fault evidence for a practical machine review.

Send a full-cycle video, good and failed packs, current settings, material details, alarms and measured utilities. The review can focus on the first process deviation instead of guessing from the final defect.

Request review