EP2264247B1 - Procédée de fabrication d'un réseau - Google Patents

Procédée de fabrication d'un réseau Download PDF

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Publication number
EP2264247B1
EP2264247B1 EP10163529A EP10163529A EP2264247B1 EP 2264247 B1 EP2264247 B1 EP 2264247B1 EP 10163529 A EP10163529 A EP 10163529A EP 10163529 A EP10163529 A EP 10163529A EP 2264247 B1 EP2264247 B1 EP 2264247B1
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EP
European Patent Office
Prior art keywords
series
elements
thread
net
manufacture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10163529A
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German (de)
English (en)
Other versions
EP2264247A1 (fr
Inventor
Pierluigi Maggioni
Cesare Beretta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tenax SpA
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Tenax SpA
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Publication of EP2264247A1 publication Critical patent/EP2264247A1/fr
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Publication of EP2264247B1 publication Critical patent/EP2264247B1/fr
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E02D17/202—Securing of slopes or inclines with flexible securing means

Definitions

  • the present invention relates to a process for production of multi-planar nets.
  • the invention relates to a method of making a layered monobloc product in which all layers forming it are disposed in distinct planes rigidly interconnected during the same process of co-extrusion so as to form a single continuous structure.
  • multilayer nets obtained by an extrusion process are presentely commonly used in geotechnical applications and not.
  • multi-planar nets for geotechnical use are known which have optimal features in terms of fluid drainage, in combination with an excellent resistance to compressive forces applied in a direction orthogonal to the median plane of the manufactured product.
  • the present invention aims at finding a solution for the pointed out limits.
  • Another aim of the invention is to obtain a final product of less weight per square meter, the draining capability being the same.
  • An auxiliary aim of the invention is to make available a method for production of nets that can be used in quite different sectors (such as geotechnics and packaging, for example), in any case giving the multilayer product advantageous features for the specific sector.
  • the method in accordance with the invention first of all contemplates production of a multiplanar net-like article of manufacture 10 (preferably a three-planar article) that can be obtained by a co-extrusion process using known machines equipped with a rotary head.
  • the net-like article of manufacture (a semi-finished product) 10 obtained by co-extrusion can be of the type shown in Fig. 4 .
  • the net-like article 10 comprises a first, a second and a third series 2, 3, 4 of thread-like elements 2a, 3a, 4a.
  • Each series lies in a respective plane A, B, C that is parallel and offset relative to the plane of the adjacent series ( Fig. 3d ).
  • thread-like elements 2a, 3a, 4a of each series 2, 3, 4 are substantially parallel to each other.
  • the thread-like elements 2a of the first series 2 are rigidly fastened to the thread-like elements 3a of the second series 3 at respective knots 5.
  • the thread-like elements 3a of the second series 3 are rigidly fastened to the thread-like elements 4a of the third series 4 at respective corresponding knots 6.
  • a monobloc multiplanar net which is rigidly interconnected and defines a plurality of meshes.
  • knots 5 between the first and second series 2, 3 and the knots 6 connecting the second and third series 3, 4 of thread-like elements are disposed at corresponding positions in such a manner as to define true coupling regions wherein the first, second and third series are connected to each other.
  • the mesh structure is rather uniform and the three series of elements are coupled at corresponding knots.
  • the process for making the multiplanar nets being the object of the invention contemplates that, once the net-like article of manufacture 10 described above has been made, in particular by co-extrusion of said thread-like elements by means of a known and appropriate rotary head, at least one further stretching step of the net-like article of manufacture 10 thus obtained is carried out at least in a first stretching direction 7.
  • the first stretching direction 7 is substantially transverse to such an extrusion direction.
  • the stretching direction 7 will be orthogonal to the feeding direction MD previously mentioned, so that the elements of the first and third series (2, 4) will be mainly acted upon.
  • the first stretching direction 7 is not coincident with any longitudinal extension direction of the three series of threads of the product.
  • the thread-like elements 2a and 4a of the first and third series 2, 4 are correspondingly extended, while maintaining the geometric relation of mutual parallelism.
  • the above means that, upon examination of a section at different points of a mesh it is possible to see that the greater section is at the knots 5, 6, then said section becomes increasingly smaller (even if the geometry thereof is partially uneven) until it reaches a mid-line region where it starts increasing again as far as in the vicinity of the immediately following knot.
  • the stretching operation reduces the weight of the article of manufacture per dimensional unit.
  • the three planar net is in particular stretched at least in two stretching directions where the second stretching direction 13 is transverse to the first stretching direction 7.
  • the second stretching direction is parallel to the feeding direction of the machine (MD) and actually it is coincident with the longitudinal extension direction 8 of the thread-like elements 3a of the second series 3.
  • the thread-like elements of the second series too modify their geometry and the section varies from a maximum value at the knots to a minimum value at a mid-line region between two consecutive knots.
  • the production method may also comprise a step of engaging at least one layer of filtering material 12 with the net-like article of manufacture 10, which layer can be associated either with the first series 2 or with the third series 4 of the thread-like elements (in a further embodiment it could be associated with both series).
  • the two layers 2, 4 placed upon and under the central one 3 respectively have threads that are not oriented in a direction orthogonal to the machine direction (MD), but according to an angle of at least 15° and they form with each other an angle in which the MD direction is substantially the bisector.
  • MD machine direction
  • the capability of orienting the net in a direction at least orthogonal to the extrusion direction enables a final product to be obtained which has a lower weight per square meter, the draining capability being the same.
  • the pressure variation to which the product is submitted that would lead to a greater crushing in a direction orthogonal to the median plane of the article of manufacture can be easily counteracted by a reduction in the width of the channels (and therefore the free bending length of the threads), by merely varying the value of the stretching ratio (provided a good assembly of thread sizes, angles between the threads and correct stretching ratio is always maintained) and no longer by modifying the number of the longitudinal threads of the article of manufacture.
  • the stretched product at all events has substantially taut threads, knots substantially maintaining the original thickness (in particular the thickness loss is less than 15% and on average contained around 10%) and therefore the channels have wide dimensions and keep a good resistance to compression.
  • the thread of the second series 3 maintains a substantially rectilinear direction and therefore goes on representing the bisector of the angle formed by the two outermost orders of threads.
  • the net in question can be used as a geogrid where it is possible to utilise the volume capacity within the channels between the threads of the order oriented in the machine direction and the higher containing capacity of the ground particles in a transverse direction (appearing from the overall thickness of the product) and in an orthogonal direction from the median plane of the orders of threads composing the article of manufacture (due to the presence of the outermost orders of threads, each of which passes through the mesh traced by the opposite thread orders).
  • the present invention allows the object of the mentioned US patent to be improved by maintaining the same draining capability while at the same time being more flexible from the production point of view, as it is possible to obtain the necessary resistance capacity to the pressure of the article of manufacture merely by correctly modifying the stretching ratio in a direction transverse to advancing of the threads in the machine and by reducing the free bending length of the threads themselves.
  • a possible use of the inventive net having a low weight per square meter is therefore that for packaging products such as hay or fruit and vegetables.
  • the light weight of the net and the marked thinness of the threads disposed according to the previously described specifications give the net an optimal containing elasticity combined with a great strength of the threads oriented in the machine direction ( Fig. 5 ).
  • the intrinsic elasticity given to the net due to the particular arrangement and working of the orders of threads, enables a possible reduction in weight/volume of the wrapped product to be taken up, for instance when packaging of vegetables is concerned, by adapting the wrapping element to the sizes of the contents without the package losing its mechanical strength.
  • FIG. 5 A net for this type of applications is shown in Fig. 5 ; it is a light net having three orders of threads disposed as previously described and is obtained following the process in accordance with the invention.

Claims (11)

  1. Procédé de fabrication de filets à plans multiples, comprenant les étapes suivantes :
    - la réalisation d'un article de fabrication en forme de filet d'un seul bloc par au moins les sous-étapes suivantes :
    • la fourniture de première, deuxième et troisième séries (2, 3, 4) d'éléments filaires (2a, 3a, 4a), chaque série (2, 3, 4) ayant des éléments filaires (2a, 3a, 4a) parallèles l'un à l'autre ;
    • le couplage de la première série (2) d'éléments filaires (2a) à la deuxième série (3) d'éléments filaires (3a) de telle manière que les éléments (2a) de la première série (2) soient inclinés par rapport aux éléments (3a) de la deuxième série (3), les éléments de la première série (2) se trouvant dans un plan de pose (A) différent de celui des éléments de la deuxième série (3), les régions de couplage entre les éléments filaires (2a) de la première série (2) et les éléments filaires (3a) de la deuxième série (3) définissant une pluralité de noeuds (5) entre les première et deuxième séries ;
    • le couplage de ladite deuxième série (3) d'éléments filaires (3a) à ladite troisième série (4) d'éléments filaires (4a) de telle manière que les éléments de la deuxième série (3) soient inclinés par rapport aux éléments de la troisième série (4), les éléments de la première série (2), de la deuxième série (3) et de la troisième série (4) se trouvant dans des plans de pose (A, B) différents l'un de l'autre, les éléments de la deuxième série (3) étant interposés entre les éléments de la première série (2) et les éléments de la troisième série (4), les éléments de la deuxième série et les éléments de la troisième série définissant une pluralité de noeuds de connexion (6) entre les deuxième et troisième séries (3, 4) ; caractérisé en ce qu'il comprend en outre une étape d'étirement de l'article de fabrication en forme de filet (10) ainsi obtenu dans au moins une direction d'étirement (7).
  2. Procédé selon la revendication précédente, caractérisé en ce que les étapes de la réalisation de ladite première série (2), de ladite deuxième série (3) et de ladite troisième série (4) d'éléments filaires et l'étape d'association de ladite première série à ladite deuxième série et à ladite troisième série sont sensiblement simultanées.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite étape de réalisation d'un article de fabrication en forme de filet (10) est obtenue par une étape d'extrusion, les éléments filaires (3a) de la deuxième série (3) ayant une direction d'extension sensiblement parallèle à la direction de déplacement vers l'avant (MD) de l'article de fabrication en forme de filet (10) sortant de l'extrudeuse.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments filaires de la première série (2) et les éléments filaires de la troisième série (4) sont réalisés de manière à avoir des axes d'extension (9, 11) inclinés l'un par rapport à l'autre, les éléments de la deuxième série (3) étant inclinés par rapport aux éléments des première et troisième séries (2, 4).
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les noeuds de connexion (5) entre les première et deuxième séries (2, 3) et les noeuds de connexion (6) entre les deuxième et troisième séries (3, 4) sont réalisés de manière à se trouver à des emplacements correspondants définissant des noeuds de connexion entre les première, deuxième et troisième séries.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments de la deuxième série (3) définissent sensiblement une bissectrice de l'angle (α) formé entre les éléments des première et troisième séries (2, 4).
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend en outre une autre étape d'étirement pour étirer l'article de fabrication en forme de filet (10) dans une autre direction (13) transversale à la première direction d'étirement (7), la première direction d'étirement (7) n'étant pas de préférence parallèle à une direction d'extension quelconque des éléments filaires des première, deuxième et troisième séries.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite première direction d'étirement (7) est sensiblement transversale et de préférence orthogonale à la direction de déplacement vers l'avant (MD) au cours de la fabrication, et à l'extension longitudinale (8) des éléments filaires de la deuxième série (3).
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite autre direction d'étirement (13) est transversale et de préférence orthogonale à ladite première direction d'étirement (7), ladite autre direction d'étirement (13) étant avec le plus de préférence parallèle à la direction d'extension longitudinale (8) des éléments filaires de la deuxième série (3).
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend en outre une étape d'association d'au moins une couche de matériau filtrant (12) à l'article de fabrication en forme de filet étiré, ladite couche de matériau filtrant (12) étant de préférence associée à ladite première série (2) d'éléments filaires et/ou à ladite troisième série (4) d'éléments filaires.
  11. Filet à plans multiples, en particulier pour drainer des fluides, comprenant :
    - au moins des première, deuxième et troisième séries (2, 3, 4) d'éléments filaires (2a, 3a, 4a), les éléments filaires (2a) de la première série (2) étant parallèles l'un à l'autre, les éléments filaires (3a) de la deuxième série (3) étant parallèles l'un à l'autre et les éléments filaires (4a) de la troisième série (4) étant parallèles l'un à l'autre, les éléments filaires de la première série (2) se trouvant dans un premier plan de pose (A), les éléments filaires de la deuxième série (3) se trouvant dans un deuxième plan de pose (B) et les éléments filaires de la troisième série (4) se trouvant dans un troisième plan de pose (C), lesdits plans de pose (A, B, C) étant décalés l'un par rapport à l'autre,
    - des noeuds de connexion (5) entre les éléments filaires de la première série (2) et les éléments filaires de la deuxième série (3) ;
    - des noeuds de connexion (6) entre les éléments filaires de la deuxième série (3) et les éléments filaires de la troisième série (4), caractérisé en ce que les éléments filaires (3a) de la deuxième série (3) sont étirés le long de leur direction d'extension principale (8), en ayant une coupe, dans un plan orthogonal à la direction d'extension principale, qui diminue puis augmente en passant d'un noeud au noeud suivant.
EP10163529A 2009-05-25 2010-05-21 Procédée de fabrication d'un réseau Not-in-force EP2264247B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2009A000919A IT1394408B1 (it) 2009-05-25 2009-05-25 Procedimento per la realizzazione di reti multiplanari stirate

Publications (2)

Publication Number Publication Date
EP2264247A1 EP2264247A1 (fr) 2010-12-22
EP2264247B1 true EP2264247B1 (fr) 2012-06-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10163529A Not-in-force EP2264247B1 (fr) 2009-05-25 2010-05-21 Procédée de fabrication d'un réseau

Country Status (5)

Country Link
US (1) US20100294115A1 (fr)
EP (1) EP2264247B1 (fr)
CN (1) CN101920566B (fr)
ES (1) ES2387354T3 (fr)
IT (1) IT1394408B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102529103B (zh) * 2011-12-21 2015-07-29 泰安路德工程材料有限公司 聚酯(pet)塑料土工格栅及其制造方法
CN107542016A (zh) * 2017-08-09 2018-01-05 中铁四局集团第工程有限公司 一种控制路基差异沉降的填筑方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1252382B (it) * 1991-11-12 1995-06-12 Rdb Plastotecnica Spa Struttura di rete a strati per il drenaggio di fluidi particolarmente per uso geotecnico
US5851089A (en) * 1996-10-07 1998-12-22 Tenax Spa Composite reinforced structure including an integrated multi-layer geogrid and method of constructing the same
IT1284964B1 (it) * 1996-10-15 1998-05-28 Tenax Spa Struttura lastriforme con protuberanze superficiali per la realizzazione di elementi distanziatori grippanti drenanti
GB2390565A (en) * 2002-06-27 2004-01-14 Tensar Internat Ltd Geogrid
ITMI20060320A1 (it) * 2006-02-22 2007-08-23 Tenax Spa Elemento lastriforme del tipo rete particolarmente per applicazioni geotecniche
ITMI20060498A1 (it) * 2006-03-20 2007-09-21 Tenax Spa Rete multistrato per il drenaggio di fluidi particolarmente per uso geotecnico
ES2264908B1 (es) * 2006-04-10 2008-01-01 Intermas Nets S.A. Metodo para la conformacion de un material de estructura reticular, instalacion para su realizacion y material reticular resultante del metodo.
EP2037046B1 (fr) * 2007-09-17 2011-05-11 Tenax S.p.A. Filet pour drainage et filtrage, particulièrement pour application géotechniques

Also Published As

Publication number Publication date
CN101920566B (zh) 2015-01-14
ITMI20090919A1 (it) 2010-11-26
US20100294115A1 (en) 2010-11-25
IT1394408B1 (it) 2012-06-15
EP2264247A1 (fr) 2010-12-22
ES2387354T3 (es) 2012-09-20
CN101920566A (zh) 2010-12-22

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