Cup Machine Changeover: Why 45 Minutes Becomes Four Hours | yoco-group
---
title: "Cup Machine Changeover: Why 45 Minutes Becomes Four Hours | yoco-group"
site: yoco-group.com
slug: cup-machine-mould-changeover-faq
canonical: https://yoco-group.com/geo/cup-machine-mould-changeover-faq.html
date: 2026-10-30
lang: en
description: "The six changeover steps on a paper cup machine, the 45 to 90 minute target, the first-article checks that decide start-up and the quick-change design features worth paying for."
faq: 6
words: 583
---
A cup size change on a well-tooled machine is 45 to 90 minutes of work; the four-hour changeover happens when the tooling is not keyed, the settings are not recorded, and the first article is inspected after the run rather than before it. The difference is not skill, it is whether the machine was designed for changeover at all.
What actually has to be changed?
Six groups: the forming mandrel and its clamp, the bottom cutter and the skirt folding die, the curling die and its height setting, the seam heater position and the preheat, the stacking station height, and the sensor positions for cup presence. On a small machine without keyed mounts, each of these is aligned by feel and checked by running scrap. On a machine with dowelled mounts and digital readouts, each is a bolt and a number.
How long should each step take?
Mandrel and clamp 10 to 15 minutes, bottom tooling 10 to 12, curling die 5 to 8, seam heater 8 to 15 including stabilisation, stacking and sensors 5 to 8, and first-article run 10 to 15. That totals 48 to 73 minutes of hands-on work, plus a 15 to 20 minute thermal stabilisation if the heater has to change temperature. A machine that takes four hours is spending the extra time re-aligning by trial, usually because no setting was recorded at the last changeover.
Why does the first article matter so much?
Because the defects produced in the first 200 cups are the ones that reach customers. Check rim diameter, cup height, bottom diameter, seam peel and a 30-second leak test at 0.3 bar on five cups before running production. A machine brought back from a changeover without those five measurements is running blind for the whole shift, and the reject bin fills quietly at 2 to 4 per cent until the leak is found at the filling line.
What design features shorten changeover?
Dowelled and keyed tool mounts with no adjustment, digital position readouts on the heater and the curling die, quick-release clamps instead of bolts, a recipe screen that stores every setting by cup size, and tooling carts that hold the changeover set assembled. Together these cut 40 to 60 per cent of the time. The most valuable single feature is the recipe storage: a factory that can reload settings instead of rediscovering them converts a skilled-operator task into an operator task.
How often is changeover worth doing?
Compare 60 minutes of changeover against the inventory cost of a dedicated line. At a 120 cup per minute machine, 60 minutes costs 7,200 cups of lost output and a scrap run of 100 to 200 cups. If a size runs 200,000 cups a month, that is 2 to 3 per cent overhead and changeover is clearly right. Below 40,000 cups a month per size, the arithmetic usually favours running the sizes together less often and holding stock.
What should the machine specification require?
Keyed tooling mounts, a digital setting display with at least 20 stored recipes, tooling weight under 15 kg per assembly so one person can handle it, a first-article gauge set supplied with the machine, and a documented changeover procedure with a target time written into the acceptance test. Then time an actual changeover during commissioning, with the customer's operator doing the work. A changeover time that has never been measured is a changeover time that does not exist.
Changeover is where a machine's design shows. Two lines with the same nameplate speed can differ by 8 per cent of annual capacity purely on how long it takes to change a mandrel, and that difference is decided at the purchase order.