CN101328648B - Reparing method of polyethylene twist netting for net box or purse net - Google Patents

Abstract

The invention relates to a net mending method for a polyethylene twist net used by a net cage or a purse net, which relates to net mending and is required to provide the net mending method for maintaining the mechanical property of the polyethylene twist net after mending. The method comprises the following steps of: cutting of the net, terminal treatment of mesh feet, selection of seam and the net mending means. The method is characterized in that: a hole of the net is cut into a rectangle or a square, and terminals of the mesh feet of cutting edges are processed by the melting method; a novel net with the same specification is selected and cut into a rectangle or a square, and the terminals of the mesh feet of the cutting edges are processed by the melting method, and the vertical mesh number and the horizontal mesh number of the novel net are respectively one mesh more than the hole of the net; a high-strength nylon multifilament net is selected to be the seam, and the terminal of the seam is processed by the melting method; the net used for net mending is overlapped with the hole of the net, and superfluous net meshes of the net used for net mending compared with the net in the vertical direction and the horizontal direction are aligned with net meshes on the circumference of the hole; and the seam is used for beginning to mend the net on a crude foot on a net mesh joint point which is three meshes far away from the hole, and the seaming is performed by the seam according to the general trend of the seam until the terminal is seamed. The method is used for mending the net.

Description

Net cage or purse seine polyethylene twist net slice net mending method

Technical field:

The invention belongs to fishing knotless netting method for repairing and mending.

Background technology

The net sheet is the sheet braided fabric that is woven into certain mesh structure by netting twine, is the important materials in the fish production, and the net sheet can be divided into knotless netting and knotted netting two classes.Knotless netting comprises twist net slice, raschel netting, plain netting and inserting; Knotted netting comprises reef knotted netting, English knotted netting and the distortion sheet of knotting.The polyethylene twist net slice is a kind of knotless netting of special construction, is generally twisted mutually to twist with the fingers to intert by 2 strands or 3 strands of polyethylene monofilaments to form.The mesh vertical and horizontal pulling force of polyethylene twist net slice is all better, and the net sheet is in use not yielding.Compare advantage such as easy operating when the polyethylene twist net slice has in fish production that sinking speed is fast, resistance to water-flow is little, rate of drying is fast, is easy to clean and receives hoisting net with raschel netting with equal tensile mechanical properties or knotted netting.Because of the polyethylene twist net slice has above-mentioned lot of advantages, on deep water culture net cage, tuna seine, be used widely, be not limited at set net, trawlnet at present, applied in the fish productions such as net, trap and cylinder mould and use, in other fields such as golf driving net, jungle protection network, fly net, safety net, hammock, use has been arranged also.Especially in Japanese fishery, the polyethylene twist net slice is used quite extensive, the trend that has alternative woven knotted netting, raschel netting to use on purse seine, trawlnet and trap.Compare with single fast knot type polyethylene net sheet,, because it has good fishing performance, obtained the approval that China cage culture family, purse seine are fished for the fisherman although polyethylene twist net slice unit price is more expensive; Therefore, the polyethylene twist net slice is used in Chinese large-sized deep water mesh cage, tuna seine at present.During purse seine fishing operation or cage culture are produced, sometimes the polyethylene twist net slice can be because of hook, bursting, wearing and tearing and tear etc. former thereby be damaged, cause the escape of catches in the purse seine or abandon, the escape of cultured fishes in the net cage, thereby give and to fish for the fisherman or the raiser brings bigger economic loss, therefore, all must take scientific and effective net mending method (technology of repairing the fishing net damaged location is called the benefit net and claims net sheet repairing again) to the polyethylene twist net slice that damages, net mending method has extremely close relation to the fishing of net cage or fishing gear with performance, need to have repaired the twist net slice of damage, to guarantee the safety of fishing gear or net cage time saving and energy savingly, guarantee to fish for the economic benefit at fisherman or cage culture family.

To the polyethylene knotted netting that damages, people generally adopt the embedding reinforcing method or compile reinforcing method, but the polyethylene twist net slice to damaging does not work out suitable net mending method as yet.The polyethylene twist net slice belongs to knotless netting, and the syndeton between its order pin is the mesh tie point, and the syndeton between knotted netting order pin is anastomose (slip-knot, fast knot, two fast knot).The difference of the maximum of polyethylene twist net slice and knotted netting is: particularly after the fracture of English knotted netting order pin, the anastomose around the broken hole is difficult for slippage or loose to knotted netting under tiny external force; And after the fracture of the order pin of polyethylene twist net slice, fracture order pin and mesh tie point thereof around the broken hole are easy to slippage or loose under tiny external force, thereby form new broken hole, finally make broken hole increasing, therefore, we can not adopt traditional embedding reinforcing method or compile reinforcing method when repairing polyethylene twist net slice broken hole.It is the direction of giving priority to of the current fishery of China that deep water mesh cage breed or tuna seine are fished for.Present stage, China fisherman fishes for or cage culture when the local damage of polyethylene twist net slice occurring in producing at tuna seine, usually feel simply helpless, they generally adopt whole section etting changing tuna seine, the method for changing whole top net cage net sheet, and these methods have increased greatly fishes for or the breeding production cost; This had both restricted China and had fished for sustainable development with the cage culture engineering, gave widely-used the brought obstacle of polyethylene twist net slice at other field again, became the principal element that present restriction polyethylene twist net slice is promoted the use of.Both there be not at present generally acknowledged net cage or purse seine polyethylene twist net slice repairing technique, do not have net cage or purse seine polyethylene twist net slice net mending method national standard or industry standard, other field does not have corresponding repairing technique and net mending method standard with the polyethylene twist net slice yet yet.This just presses for a kind of net mending method that is applied to net cage or purse seine usefulness polyethylene twist net slice.

Summary of the invention

The technical issues that need to address of the present invention are to make to repair back net cage or purse seine terminal and benefit net is difficult to loose with sutural end with the order pin of polyethylene twist net slice cutting edge, keep repairing the mechanical property of back repairing area twist net slice, make the anastomose of mending net formation soft as much as possible in order to avoid abrade the fish body, the polyethylene twist net slice after the repairing keeps normal net plate shape and result of use.

Technical scheme of the present invention comprise the pruning of net sheet broken hole and cutting edge order pin end processing, mend net with the selection of net sheet and cut out, mend net with the processing of sutural selection and suture end and the repairing form of net sheet, it is characterized in that the broken hole of polyethylene twist net slice is trimmed to rectangle or square broken hole with the staight scissors method, handle (the terminal monofilament of netting twine is burnt to melt it is bonded together) broken hole order pin end of cutting edge on every side with the thawing method then; Select the new net sheet of a same size and with the staight scissors method it is trimmed to rectangle or square, it is terminal with the processing of thawing method and guarantee that its vertical T-meshes Duos 1 order at least than net sheet broken hole respectively that new net sheet is pruned the order pin on cutting limit, back; Select the high-strength nylon multifilament netting twine close with repairing net sheet order pin diameter as mending the net suture, sutural end is handled with the thawing method; To mend net and stack net sheet broken hole place, the benefit net is alignd with the mesh around the broken hole with upwards unnecessary than the net sheet broken hole in length and breadth mesh of net sheet with rectangle or square net sheet; After the net sheet stacks, give birth to pin with suture on away from a mesh tie point more than broken hole 3 orders and play benefit, wait sighting slit to close by sutural common trend, be sewn onto the terminal point end always with suture with mending net.

This method is owing to consider net cage or purse seine fishery production reality, and net sheet repairing is not subjected to the restriction in place, can carry out the repairing of polyethylene twist net slice broken hole whenever and wherever possible; This method adopts the order pin end of cutting edge to handle with the thawing method, make the order pin end of repairing cutting limit, back be difficult to loose, the end that had both overcome cutting edge is loose defective under water and tiny external force effect in the future, avoided the further diffusion of polyethylene twist net slice broken hole to spread again, method of operating is rationally reliable, practical, the repairing that each can participate in broken hole has per capita improved the repairing speed of net sheet, has saved the benefit net time; This method selects the flexibility close with repairing net sheet order pin diameter good, the high-tenacity multifilament yarn nylon netting twine that intensity is high carries out melt process as suture and sutural end with the thawing method, in case sutural end is loose under the effect of water or tiny external force in the future, both can make the anastomose after the repairing more firm, knot stability is higher, keep repairing the quality and the mechanical property of back repairing area polyethylene twist net slice, can reduce sutures again and mend net and form anastomose culturing the scratch of object or catches, improve the quality of culturing object or catches, reduce the incidence of disease of culturing object; Employing waits sighting slit to close when repairing the net sheet, and the drainability that does not influence the net sheet also helps the exchange of the inside and outside water body of netting gear, has improved the fishing security of repairing back polyethylene twist net slice in the protection environment again; The polyethylene twist net slice of repairing according to this method the results showed to have the good technique effect of performance; This method can avoid changing the method for whole section etting or whole top aquaculture net cage casing etting when the local appearance of net sheet damages, saved and fished for cost or aquaculture cost.

Description of drawings

Fig. 1 is a net cage or purse seine polyethylene twist net slice net mending method schematic diagram;

Fig. 2 is net cage or the purse seine polyethylene twist net slice schematic diagram after repairing.

The specific embodiment

The present invention includes net cage or purse seine with the processing of the pruning of polyethylene twist net slice broken hole and cutting edge order pin end, mend net with the selection of net sheet and cut out, mend net with the processing of sutural selection and suture end and the repairing form of polyethylene twist net slice, this method is trimmed to rectangle or square broken hole with the erose broken hole of polyethylene twist net slice with the staight scissors method, and handle the order pin end of cutting edge around rectangle or the square broken hole with the thawing method, in case the order pin end of cutting edge is loose under the effect of water or tiny external force in the future; Select the new net sheet of a same size and it is trimmed to rectangle or square, prune the order pin end on back rectangle or square cutting limit and will handle and guarantee that its vertical T-meshes Duos 1 order at least than rectangle or square broken hole respectively with the thawing method with the staight scissors method; Select the high-strength nylon multifilament netting twine close as mending the net suture with repairing net sheet order pin diameter, both can improve the mechanical property of repairing back repairing area twist net slice, can make the anastomose of mending net formation soft as much as possible again in order to avoid scratch fish body, sutural end must be handled with the thawing method, in case sutural end is loose under the effect of water or tiny external force in the future; To mend net and stack rectangle or square broken hole place, the benefit net is upwards alignd with the mesh around the broken hole than rectangle or the unnecessary mesh of square broken hole in length and breadth with the net sheet with rectangle or square net sheet; After the net sheet stacks, to mend net and play benefit away from the upward living pin of a mesh tie point more than broken hole 3 orders (1 among Fig. 1, Fig. 2) with suture (dotted line of 3 expressions among Fig. 1), with suture by sutural common trend (Fig. 1, in curved arrow point to) waits sighting slit to close, be sewn onto terminal point (2 among Fig. 1, Fig. 2) end always; Starting point during net sheet repairing and terminal point all adopt two fast knots, other benefit nets to adopt single fast knot with anastomose, and all are mended nets and all must fully tie tight with anastomose; Mending the length of netting suture between the adjacent anastomose (4 among Fig. 1) that forms should be greater than bar size, in case suture shrinks, influences net plate shape and result of use between anastomose under high temperature or dry environment effect in the future.

Claims (3)

1. net cage or purse seine are with polyethylene twist net slice net mending method, comprise the pruning of net sheet broken hole and cutting edge order pin end processing, mend net with the selection of net sheet and cut out, mend net with the processing of sutural selection and suture end and the repairing form of net sheet, it is characterized in that the broken hole of polyethylene twist net slice is trimmed to rectangle or square with the staight scissors method, handle the broken hole order pin end of cutting edge on every side with the thawing method then; Select the new net sheet of a same size and with the staight scissors method it is trimmed to rectangle or square, it is terminal with the processing of thawing method and guarantee that its vertical T-meshes Duos 1 order at least than net sheet broken hole respectively that new net sheet is pruned the order pin on cutting limit, back; Select the high-strength nylon multifilament netting twine close with repairing net sheet order pin diameter as mending the net suture, sutural end is handled with the thawing method; To mend net and stack net sheet broken hole place, the benefit net is alignd with the mesh around the broken hole with upwards unnecessary than the net sheet broken hole in length and breadth mesh of net sheet with rectangle or square net sheet; After the net sheet stacks, give birth to pin with suture on away from a mesh tie point more than broken hole 3 orders and play benefit, wait sighting slit to close by sutural common trend, be sewn onto the terminal point end always with suture with mending net.

2. net cage according to claim 1 or purse seine all adopt two fast knots, other benefit nets to adopt single fast knot with anastomose with polyethylene twist net slice net mending method, starting point when it is characterized in that net sheet repairing and terminal point.

3. net cage according to claim 1 and 2 or purse seine is characterized in that mending the length of the adjacent anastomose break joint zygonema of netting formation greater than bar size with polyethylene twist net slice net mending method.

Images