RO138036A2 - Flexible structure for making submerged enclosures intended for hanging-culture of bivalve molluscs from the ostreidae family - Google Patents

Abstract

The invention relates to a flexible cotton woven fabric for making submerged enclosures intended for hanging culture of bivalve molluscs from the Ostreidae family. According to the invention, the fabric is made of cotton threads with a length density of 500 dtex x 2, with 80 twists/m both in weft and in warp, using a band warping machine provided with axial development creel, at a thread tensioning of 0.20 cN/dtex, with braking provided by brake discs and porcelain shaft, the thread guide being placed with an offset of ± 10 mm, the weaving operation using a non-conventional weaving machine with negative holders, provided with 14 harnesses: 12 for the base threads with 355 (+ 6 reserves) healds/harness and 2 harnesses for the border threads with 54 healds/harness, the pass being carried out in harness bodies with 1 thread/heald for the base threads and 2 threads/heald for the border threads, with ciphered pass: -//1-1-2-2-3-9-4-10-5-11-6-12-7-13-8-14//-, reed width of 160 cm, with 135 reed and 2 threads pulled in the reed cradle, P2/2 weave, the weave card being -//1-3-5-7-9-11/1-3-5-7-9-11/2-4-6-8-10-12/2-4-6-8-10-12//-, the fabric count 22, the weft threads being inserted in the shed using an inserting mechanism with negative holder, the thread being fed by means of 4 alternately-operating pre-deliverers, the resulting woven fabric having a mass of 312 ± 16 g/m2, warp and weft breaking resistance of at least 170 daN/5 cm, breaking elongation in both systems of at least 20%, slipping resistance of at least 30 daN in warp and weft and tearing resistance of at least 25 daN in both systems.

Description

Flexible structure for making submerged enclosures for suspended growth of bivalve molluscs from the Ostreidae family

Authors: Jomir Mihaela, Alexandra Gabriela Ene, Carmen Mihai

The invention refers to a flexible structure in the form of woven textile material used to make submerged enclosures for the directed growth in the long-line system of oysters from the subclass Pteriomorphia, family Ostreidae, genus Magallana, with the binomial name Crassostrea gigas.

The oyster development enclosures are placed on artificial supports suspended in the water mass, at the horizon of 2 - 5 m and ensure the protection of the biological material parked.

A textile structure knitted from the warp made of polyamide yarns with a length density of 176den/f32x4 and with a hexagon side of 7 mm is known, used in the construction of enclosures for the development of the bivalve molluscs Crassostrea gigas, but it has the disadvantage of high maintenance costs of the entire long system -line, because the enclosures must be changed at a maximum of 4 months, considering the development cycle of the juveniles, which involves linear and weight increases (without there being a correlation between them).

There is also known a woven textile structure made of polyester yarns with a length density of 940 dtex/f92xl/60Z in the warp and polyamide yarns with a length density of 660dtex/fl00xl/150Z in the weft, used to make enclosures for the development of bivalve molluscs, but which presents the disadvantage of a mass/resistance to stress ratio in the unsuitable environment (tear resistance in the warp and weft 82 daN, mass 380 g/m2).

Also known is a textile structure knitted from the warp made of polyamide 6.6 threads with a length density of 600den/fl20 xl/300Z, used in the manufacture, in the form of a "Japanese lantern", of enclosures for the development of bivalve molluscs but which it has the disadvantage of a high rigidity of the material and a reduced resistance to static mechanical stresses (strangulation at intervals of 50 cm in order to place the enclosures on the cylinder and avoid sliding on the column of oysters).

The problem that this invention solves consists in choosing the type of raw material and the connection of the fabric so that the whole assembly ensures the following operational requirements: extending the time interval between two periodic checks and the maintenance of the entire long-line system (fouling cleaning and thinning); decreasing the distance between enclosures below 70 cm in order to increase the productivity of consumption oysters with a waist of 80 mm); high flexibility, impact resistance of at least 50 daN, technical resource of 24 months, under conditions of min. 4 bf.

The fabric according to the invention eliminates the disadvantages mentioned in that the woven structure is made of 100% cotton threads, both in the warp and the weft, with the length density 500dtex x 2, with 80 ras/m, P2/2 connection made in 14 ite ( 12 for the background threads and 2 for the edge threads), navadire in ite bodies, with the connection card: -//1-3-5-7-9-11/1-35-7-9-11/2- 4-6-8-10-12/2-4-6-8-10-12//-.

The process of making the fabric is well-known and consists of: conditioning the threads for 24 hours at a temperature of 22-25 °C and a relative humidity of 65%, warping on a warping machine in bands with a thread tension of 0.20 cN/dtex, weaving, made on a non-conventional weaving machine and control-metering, made on the control ramp.

The invention presents the following advantages:

- reduction of financial efforts related to imports;

- the possibility of making it on machines in the country, with easily accessible materials;

- increasing the time interval for periodic checks and maintenance of the long-line system;

- increasing the productivity of consumption oysters with a waist of 80 mm;

- ease of handling and placement of submerged premises;

- easy maintenance at low costs.

Next, the example of the invention is presented.

EXAMPLE

The warping of cotton yarns with a length density of 500dtex x 2, with 80 ras/m is carried out on a strip warping machine, equipped with an axial spreader; wire tension: 0.20 cN/dtex, braking is done with the help of porcelain brake discs and spindle, and the wire guide is placed with an offset of ±10 mm, to ensure the lifting of the tip of the unfolding balloon and the symmetry with respect to the tip the deployment format.

Weaving is carried out on an unconventional weaving machine with negative grippers, equipped with 14 stitches: 12 stitches for the background yarns with 355 (+6 reserve) stitches/piece and 2 stitches for the edge threads with 54 stitches/piece each, navadira it is made in ite bodies, with 1 thread in skeins for the background threads and 2 in skeins for the edge threads, the numbered thread: -//1-1-2-2-3-9-4-10-5- 11-6-12-7-13-8-14//-, the width at the back is 160 cm, the number of the back: 135, the number of threads drawn in the box of the back: 2, the connection P2/2, the card of the connection -// 1-3-5-7-9-11/1-35-7-9-11/2-4-6-8-10-12/2-4-6-8-10-12//-, wheel of decimes: 22.

Cotton weft yarns with a length density of 500dtex x 2 with 80 ras/m are inserted into the joint using the negative gripper insertion mechanism; wire feeding is carried out with the help of 4 pre-delivery machines that work alternately.

The fabric has a mass of 312 ± 16 g/m2, the resistance to breaking in the warp and weft of min. 170 daN/5cm, elongation at break in both systems of at least 20%.

The slip resistance for the fabric tested in conditioned condition is min. 30 daN in the warp and weft, and the tear resistance is at least 25 daN in both systems.

The fabric obtained in this way is finished by a process known in itself, including the operations of washing and depositing a polyurethane film with a thickness of 0.15 mm.

The support obtained in this way is used to make submerged enclosures for the suspended growth of bivalve molluscs Crassostrea gigas.

References:

US4300477A

US4716854A

US4198924A

US5038715A

US5178093A

US5353745A

W02006029481A2

EPI773I16AI

CA2571439A1

Claims (2)

1. The cotton thread fabric, with a length density of 500dtex x 2, with 80 ras/m, both in the warp and in the weft, characterized by the fact that it is on a strip warping machine, equipped with an axial spread rake; thread tension: 0.20 cN/dtex, braking made with the help of porcelain brake discs and spindle, thread guide placed with an offset of ±10 mm, weaving is carried out on a non-conventional weaving machine with negative grabs, equipped with 14 ite: 12 ite for the background yarns with 355 (+6 reserve) crochets each and 2 ites for the edge yarns with 54 crochets each, the weaving is made in ite bodies, with 1 yarn in each crochet for the background and 2 crochets for the edge threads, numbered thread: -//1-1-2-2-3-94-10-5-11-6-12-7-13-8-14//-, width in the back is 160 cm, back number: 135, number of threads drawn in the back box: 2, connection P2/2, connection card -//1-3-5-7-9-11/1-3-5- 7-9-11/2-46-8-10-12/2-4-6-8-10-12//-, count wheel: 22, the weft threads are inserted into the joint with the help of the insertion mechanism negative grapple; wire feeding is carried out with the help of 4 pre-delivery machines that work alternately. 2. Fabric according to claim 1 with mass of 312 ± 16 g/m2, resistance to breaking in the warp and weft of min. 170 daN/5cm, elongation at break in both systems of at least 20%, slip resistance for the fabric tested in a conditioned state is min. 30 daN in the warp and weft, and the tear resistance is at least 25 daN in both systems