Proof Net is the HDPE net in the four photographs above: a multi-span block with the net carried over the house, the same net seen from inside along the wall, the net pulled over the hoops of a tunnel, and the cloth as it leaves the factory on the roll. It is quoted as Insect Proof Net FCW-30, and it is the layer of a greenhouse that keeps air moving while it keeps insects out.

Take the jobs of a cover apart and the net stands on its own. Weather and heat are dealt with by the film cover or by rigid sheets, and the house and the wind load are carried by the frame it is stretched over. The net does neither. It is the exclusion layer, fitted where a house would otherwise stand open to the outside - a vent, a side wall, a doorway, a tunnel end - so that air still moves through while the insects that carry virus and disease stay out.

Because the job is exclusion rather than strength, the net is ordered by what has to be kept out, and this page gives that as two figures: a mesh of 30 openings to the inch, and a wire diameter of 0.14 to 0.15 mm. Where a grower is working against a pest of a known size rather than against a mesh count, tell us the opening you need and the two figures are matched to it.

The cloth is HDPE - high density polyethylene - and the specification calls it out with an Anti-UV Protect Addition. That addition is what makes an outdoor net out of a plastic mesh: an unstabilised polyolefin goes brittle in sunlight, and a brittle net sheds its weave at the first strong gust, at which point the mesh figure stops describing anything. With the UV protection in the compound, the cloth holds the weave it was made with while it sits under tension on the frame.

The specification therefore states a use time of 5 years under normal usage. The figure is written against the material in that service: it assumes the net is doing the job it is made for, as a cover on a frame. A net that is stored or handled against cut tube ends and wire ties, or kept in permanent contact with wet ground, is cut or scuffed long before the polymer has aged - and that is a question of the roll being looked after, not of a different grade of cloth.

This is a roll product, so an order is worked out in metres and rolls rather than in pieces. Three widths are standard - 1 m, 1.5 m and 2 m - and the net is sewn to any width a house needs, so a wide span is covered by one sheet rather than a row of overlapping strips. A standard roll runs 450 m, and each roll is packed in one woven bag, which is how it is stored and how it is shipped.

Because the net arrives as a full roll, it is planned against a house or a block rather than counted out bay by bay. Send the finished width and the total length of the surface to be covered, and the order is worked out from the 450 m roll, with the number of rolls and the sewn width confirmed with the order.

Model: Insect Proof Net FCW-30
Material: HDPE with Anti-UV Protect Addition
Standard width: 1 m, 1.5 m, 2 m; sewed to any width is available
Standard length: 450 m
Mesh per inch: 30
Wire diameter: 0.14-0.15 mm
Packing: One roll with one woven bag
Use time: 5 years under normal usage

Our company has been making greenhouse and planting tools for above 35 years, and we supply over 1,200 different kinds of planting tools. They are used by farms, and by agricultural science academies and institutes at home and abroad, and we have exported to more than 120 countries around the world.

As a net supplier we quote from our own works, so the price follows the cloth and the sewing rather than a middleman's list. The rolls are dispatched with the rest of the planting tools and accessories and with the greenhouse equipment lines, on the same order and in the same shipment.

Extension material on protected cultivation and on keeping insects out of a crop is published by the USDA, and reporting on commercial protected cropping appears in HortiDaily.

Q: What is the proof net on this page made of?
A: HDPE, high density polyethylene, listed in the specification with an Anti-UV Protect Addition, and supplied as Insect Proof Net FCW-30 in one roll to a woven bag.

Q: How long does the net last outdoors?
A: A use time of 5 years under normal usage is quoted. The anti-UV addition is what lets the cloth hold its weave in sunlight while it sits under tension, and the figure assumes the net is in service as a cover on a frame rather than being worked against sharp metal or left in standing water.

Q: What does the net do that the film does not?
A: The film is the weather layer and the frame is the structure; the net is the exclusion layer at the openings, letting air pass while keeping insects out. That is why it is quoted by mesh and wire, not by strength.

Q: What widths and lengths is the net supplied in?
A: Standard widths are 1 m, 1.5 m and 2 m, sewn to any width a house needs, and a standard roll is 450 m, packed one roll to a woven bag.

Q: How is an order for the net priced and shipped?
A: From our own works and by the roll. State the mesh and the wire, the finished width and the total length, and the number of rolls and the sewing are confirmed with the order; the net travels with the rest of the planting tools and greenhouse equipment.

Q: Who uses this net?
A: Farms and agricultural science academies and institutes at home and abroad. The company has above 35 years in greenhouse and planting tools and has exported to more than 120 countries.

If you need to ask a question and get some help to find the best greenhouse for you, then just call us on +86 191 5068 3942 or send E-mail to sales@cngreenhouses.com