Applications

PVC Reinforced Hose Extrusion Line

A PVC reinforced hose extrusion line places a load-bearing layer between two extruded PVC walls: an inner tube, a braid of polyester yarn or steel wire, and an outer coating bonded through the mesh. The reinforcement is what the customer is buying. It decides working pressure, and everything else on the line exists to put it on straight and lock it in place.

Which reinforcement you choose is a pressure decision, not a preference. Polyester braid covers general service; steel wire takes pressures and suction loads that yarn cannot, and it changes the braiding machine, the bonding step and the cooling. Choosing it late means rebuying the middle of the line.

Tell us the working pressure, the bore, and whether the hose has to resist collapse under suction. Those three answers pick the reinforcement type and the carrier count before any other specification matters.

Fiber Braid, Steel Wire or Spiral: Three Reinforcements

Buyers arrive asking for a reinforced hose line and mean one of three constructions. The reinforcement decides the braiding machine and the bonding step, so it is worth settling first:

Reinforcement	What it does	Typical use
Polyester fiber braid	Raises burst pressure while staying flexible and light	Irrigation, water supply, air, general industrial
Steel wire braid	Higher pressure, and resists collapse under vacuum	Suction and delivery, oil, slurry, construction
Spiral or helix	Holds the bore open rather than raising burst pressure	Dust and fume extraction, pool and drainage suction

The distinction people miss is between pressure and collapse. A braid resists a hose bursting outward; it does very little to stop one being crushed flat by vacuum on the suction side of a pump. If your hose is pulling as well as pushing, that is a steel wire or a spiral question, and it has to be settled before the line is quoted.

What a Reinforced Hose Line Produces

One line covers a family of industrial hose, separated by the reinforcement and the compound rather than by the machine:

Suction and delivery hose. Steel wire reinforced, for pumps that draw as well as push.
Air and pneumatic tool hose. Fiber braid, sized to the working pressure of the tool.
Oil, fuel and chemical transfer hose. Compound selected for the medium, reinforcement for the pressure.
Food-grade and beverage hose. Clear inner wall with a braid visible through it, so the operator can see the flow.
PVC-coated flexible metal hose. The coating extruder applied over a bought-in metal core rather than over a braid.

Co-extrusion widens that range further. A second melt stream in the same die head builds a multilayer wall, which is how a chemically resistant liner, a recycled middle layer or a colored identification wall is produced in one pass instead of two.

How a Reinforced Hose Is Made

A complete reinforced hose line runs six stations, each sized against your pressure target rather than your output target:

Drying and feeding. Compound is dried and fed automatically. Moisture becomes voids in the inner wall, and a void under a braid is where a burst starts.
Inner tube extrusion. A single or twin screw extruder forms the inner tube through a die head and sizing sleeve. Wall concentricity here sets how evenly the braid will later sit.
Reinforcement. A high-speed braiding machine lays 24 to 64 carriers of polyester yarn or steel wire over the tube. Braid angle and tension decide burst pressure, and tension control holds both through the run rather than at the start of it.
Bonding and outer extrusion. The heating box brings the braided tube up to temperature so the outer coating keys into the mesh instead of resting on it. Layer separation in service is almost always traced to this station.
Cooling and sizing. A stainless steel cooling tank stabilizes diameter and roundness. Steel wire carries heat differently from yarn, so cooling is set per reinforcement type.
Haul-off, printing, cutting and winding. Belt or caterpillar haul-off matched to extrusion, in-line printing, then automatic cutting and winding. Line speed is typically 6 to 15 m/min depending on bore and carrier count.

All stations run from one PLC control system with recipe storage, so a change of bore or carrier count is recalled rather than dialed in again. Screws and barrels are 38CrMoAlA alloy steel with nitriding treatment, and the electrical components are Siemens, Omron and Schneider. Our standard range covers 6 mm to 75 mm bore.

FAQ

What is a PVC reinforced hose extrusion line?

It extrudes an inner tube, braids polyester yarn or steel wire over it, then coats it with a second extruded wall bonded through the mesh. Six stations, from drying to winding.

Fiber braid or steel wire?

Fiber covers general pressure service and stays light and flexible. Steel wire takes higher pressure and resists collapse under suction, at the cost of weight, bend radius and line speed.

What stops a hose collapsing under suction?

Not the braid. A braid resists bursting outward; holding the bore open against vacuum needs steel wire or an embedded spiral, which is a different machine setting and has to be decided before quotation.

Why do the layers sometimes separate?

Almost always the heating box. If the braided tube is too cool when the outer wall goes on, the coating sits on the mesh instead of keying into it, and the two walls part in service.

How many braiding carriers do I need?

Between 24 and 64, set by working pressure. More carriers give a denser mesh and higher burst pressure at the same wall thickness, at the cost of line speed.

What do you need to quote a line?

Three things: working pressure, bore range, and whether the hose sees suction. Tell us the medium as well and we will confirm the compound and any co-extruded liner.