A paper plant stores its own fuel in very tall rolls
A paper converting plant takes parent reels and turns them into boxes, bags, tissues or packaging. The converting machines are large and they set the hall; the reels set the store.
Reel weights are concentrated and the stacks are tall
A parent reel is heavy and it stands on a small contact area, either on its side or on end depending on the handling system. Stored in stacks, the load at the bottom of a stack is considerable.
Two consequences follow. The floor has to be designed for the reel loads and the handling equipment rather than for a general warehouse load. And the store has to be tall enough for the stack height the operation needs, which is often greater than a default shed height.
Paper is the fire load, and there is a lot of it
Paper burns readily, and a reel store contains a large mass of it in a compact volume. That makes the store a fire compartment in its own right.
The usual arrangement is a fire wall between the store and the converting hall, with fire-rated doors where the reels pass through. Where that wall is omitted for the sake of forklift convenience, the whole plant becomes one compartment, and the fire load of the store is applied to the production area.
The converting hall is sized by the machine
Corrugators, printing presses and die-cutters are long machines with inline processes. The hall follows the machine line, and the height follows the machine's tallest point plus the space needed for roll changes and maintenance.
That makes a paper plant another case where the eave comes from the equipment elevation, not from the plan. It also means the crane or hoist used for roll changes has to be positioned over the machine, not over the aisle.
Dust and trim are generated continuously
Cutting and trimming produce paper dust and offcuts. The dust is combustible and it settles on every horizontal surface, and the trim has to be extracted and baled.
Roof profiles with deep ribs collect both. A smooth soffit over the machine line, with the trim extraction ducted out, is the arrangement that keeps the roof inspection from finding a fire load.
Humidity affects the product, not just the building
Paper absorbs moisture and changes dimension. A plant in a humid climate needs its paper store held at a stable humidity, or the printing registration moves between the first and last reel.
That makes the store a conditioned space, which is the opposite of the ventilated shed the rest of the building wants. The boundary between the two is a wall.
What I want before drawings
- The reel sizes and weights, and the stack height required.
- Whether the store is conditioned, and to what humidity.
- The machine line length, heights and the roll-change method.
- Whether a fire wall is required, and between which areas.
- The trim and dust extraction routes.
- The wind speed for the site in km/h from the applicable local code, not a round number.
Paper plants are straightforward industrial buildings with one dominant constraint: the fire load. Drawing the compartment lines first makes everything else simpler.
Written by Johnny Joe, who advises owners and project managers in Africa and South America on steel buildings. If this decision is live on a project, send the layout and the constraint that worries you and I will tell you what it changes.
Related: a hall sized by the machine · a combustible product with a fire load · separating a fire load · a floor added inside a shed