How to Spec a Raschel Construction Net Machine: Mesh, Gauge and Output

August 8, 2026

Spec a raschel construction net machine from the net backwards: settle mesh geometry and yarn first, then let those two decide needle bed, gauge, working width and guide bar count. A speed figure in courses per minute means little on its own — it becomes meters per hour only after lapping, mesh density and a realistic efficiency factor are attached to it.

The order matters because one platform covers a wide spread of products. Machine builder category pages list the same raschel net platform behind construction safety and scaffold netting, shade and greenhouse net, anti-bird and anti-insect net, wind protection netting, mosquito net and packing net. Same family, different setups — which means the phrase raschel net machine on a quotation is not yet a specification. For where this platform sits among warp knitting equipment in general, see our overview of warp knitting machine types and the raschel warp knitting machine family page.

Start with the net, not the machine

Three fabric decisions drive everything downstream: mesh opening, net weight and yarn. Write them down before any machine conversation starts.

Weight and mesh count are how construction netting is actually traded. Safety netting is commonly offered around 55 to 150 GSM in PE, and fine-mesh HDPE grades are quoted by mesh count — 2000 mesh per 100 square centimetres is a figure that shows up in market listings. Those are fabric specifications rather than machine ratings, but they are exactly the constraint the machine has to satisfy, so they belong at the top of your enquiry, not at the bottom.

On yarn, single needle bed raschel net machines are built around monofilament — mono or round yarn — in nylon, PE and PP. If your net program also involves tape yarn or fibrillated yarn, put that on the table early: it sits outside the mainstream configuration for this line, so treat it as a question for the builder instead of an assumption you carry into the quotation.

Needle bed and gauge: what E gauge fixes and what it does not

Raschel gauge was historically written as needles per two inches. Current practice uses E gauge — needles per inch — spanning roughly E1 to E32. That letter-and-number sets needle spacing across the bed, which caps how fine a wale pitch the machine can knit.

Gauge alone does not set mesh size. The mesh opening comes out of the lapping: how many wales and courses the pattern spends per hole, running on top of that needle spacing. A published example makes the point. Trade press describes a high-speed raschel shade and net machine at E6 gauge with full threading that produced about 3.5 meshes per centimetre under standard lappings. Coarse gauge, fine mesh count — the pattern did that work, not the gauge. Read those figures as an industry reference point for one third-party machine, not as a Grand Star rating.

The practical consequence: a quotation that names only a gauge has told you about the needle bed and nothing about the net. Ask for gauge, threading (full or part), guide bar count and the lapping the mesh figure was measured under, together, or the numbers do not compare across builders.

Working width is not finished net width

The same trade press reference lists 264 inches of working width. That is a machine dimension, and it converts into saleable net only once three things are settled: how many panels sit across the bed, how the selvedges are formed and finished, and whether the width you were quoted is measured at the needle bed or after finishing.

Two mills buying the same working width can end up with different usable output simply because one runs a single wide net and the other runs several narrower panels with edge treatment between them. Ask for the panel layout that produced the output figure in the quotation, not just the headline width.

How to read an output claim

An honest output number carries its assumptions with it. The reference machine above is quoted at up to 1,200 courses per minute, about 3.5 meshes per centimetre under standard lappings, and roughly 165 metres per hour at 80 percent efficiency. Notice the distance between the headline speed and the quoted output: the 165 m/h figure already absorbs the lapping and an efficiency haircut, and it is that second number, not the first, that resembles what a shift produces.

So the chain runs: courses per minute, then how many courses the pattern spends per centimetre of net, then an efficiency factor for creel changes, stops and repairs. Any output claim missing one of those three links cannot be compared with another builder’s claim — and if the efficiency assumption is not stated, assume it is 100 percent and discount it yourself.

Match the net type to the variables that actually move

If you knit one net type in long runs, then width, uptime and yarn handling dominate the decision, and a modest guide bar count is enough. If you switch net types every few weeks, then guide bar count and change-over time matter more than peak speed, because the machine spends a measurable share of the month not knitting. This conditional does not apply to fishing net or geogrid programs — those lines carry their own demands, and we treat them separately in our notes on the fishing net warp knitting machine and the geogrid warp knitting machine.

Questions to send before you shortlist

• What gauge, and is the quoted mesh figure measured at full threading or part threading?
• Which lapping produced the mesh-per-centimetre number in your data sheet?
• How many guide bars, and how long is a realistic change-over between two of my net patterns?
• Is the working width measured at the needle bed or after finishing, and how many panels does it yield at my net width?
• What efficiency factor sits behind the metres-per-hour figure, and what does it assume about stops?
• Which yarn types has this configuration actually run — monofilament only, or others as well?

A builder who answers all six in writing is quoting a machine. One who answers only the first is quoting a category. Send us the mesh, weight and yarn you need to produce through our contact page and we will work back to the configuration rather than forward from a model number.

Frequently Asked Questions

What gauge do I need for a construction safety net machine?

Gauge caps the wale pitch, but it does not set your mesh opening on its own — the lapping does. A published industry example runs E6 gauge with full threading and still produces about 3.5 meshes per centimetre under standard lappings. Decide the mesh geometry and net weight first, then ask the builder which gauge and lapping combination reaches it.

Is a single needle bed raschel machine enough for scaffold netting?

Single needle bed raschel net machines are the mainstream configuration on this line and are built around monofilament in nylon, PE and PP, which covers the usual construction and scaffold net programs. Confirm it against your own net weight and mesh figures rather than against the machine category alone.

How do I check whether an output figure like 165 m/h is real?

Ask what it is built from. A comparable figure needs three parts: courses per minute, the lapping and mesh density behind it, and the efficiency factor. The published reference figure of roughly 165 metres per hour is stated at 80 percent efficiency — if a quotation gives you no efficiency assumption, treat the number as a ceiling and discount it yourself.

Can the same raschel net machine make shade net and insect net too?

Builder category pages put construction safety and scaffold netting, shade and greenhouse net, anti-bird and anti-insect net, wind protection netting, mosquito net and packing net on the same raschel platform. The platform is shared; the setup is not, so the practical question is how long a change-over between your patterns takes and how many guide bars you need.

What yarn do raschel net machines run?

Single needle bed raschel net machines are built around monofilament — mono or round yarn — in nylon, PE and PP. Anything outside that, such as tape or fibrillated yarn, should be raised with the builder before the quotation rather than assumed.