EP2726674B1 - Synthetic fibre and an artificial lawn comprising such a fibre - Google Patents

Synthetic fibre and an artificial lawn comprising such a fibre Download PDF

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Publication number
EP2726674B1
EP2726674B1 EP12733231.0A EP12733231A EP2726674B1 EP 2726674 B1 EP2726674 B1 EP 2726674B1 EP 12733231 A EP12733231 A EP 12733231A EP 2726674 B1 EP2726674 B1 EP 2726674B1
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EP
European Patent Office
Prior art keywords
fibre
synthetic fibre
shaped pattern
synthetic
wave shaped
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.)
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Application number
EP12733231.0A
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German (de)
English (en)
French (fr)
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EP2726674A1 (en
Inventor
Jean-Claude Auguste
Harry R. Ma
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.)
Ten Cate Thiolon BV
Original Assignee
Ten Cate Thiolon BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE201120103403 external-priority patent/DE202011103403U1/de
Priority claimed from US13/174,997 external-priority patent/US10793973B2/en
Application filed by Ten Cate Thiolon BV filed Critical Ten Cate Thiolon BV
Priority to PL12733231T priority Critical patent/PL2726674T3/pl
Publication of EP2726674A1 publication Critical patent/EP2726674A1/en
Application granted granted Critical
Publication of EP2726674B1 publication Critical patent/EP2726674B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/20—Industrial for civil engineering, e.g. geotextiles
    • D10B2505/202—Artificial grass

Definitions

  • the present invention relates to synthetic fibers and artificial lawn comprising such a fibre. More particularly, the invention relates to grass-like monofilament type fibers having a curved cross section and an artificial grass lawn, especially an artificial grass sports field, comprising such a fibre.
  • Natural grass is often used intensively and as a result thereof and as a result of others such as varying weather influences, sustain a great deal of damage.
  • a number of artificial lawns have been introduced to provide an alternative for natural grass. These artificial lawns are used both indoors as well as outdoors.
  • a well known example of such an outdoor artificial lawn is an artificial grass sport field, for example, for playing soccer, field hockey, tennis, American football and the like.
  • WO 2010/082816 A1 in the name of the same applicant such an artificial lawn is disclosed.
  • a drawback of synthetic fibres used for artificial lawns is that they tend to assume a flat orientation relative to the ground surface during use. This can result in so-called “bare patches” in the lawn and can thus increase the risk of injuries, decrease the playing characteristics and/or give a less natural look, etc.
  • a thick layer of infill can be provided on the artificial lawn.
  • Such a thick layer of infill is for example disclosed in EP 1158099 A2 .
  • Installing this thick layer of infill is, however, more labor intensive than installation of a natural lawn.
  • substantially more maintenance is required as the infill, over time, gets a less uniform distribution due to non-uniform use of the lawn.
  • An alternative for the thick layer of infill is to provide an artificial lawn having synthetic fibres which have an increased stiffness and resilience. This result can be achieved by changing the chemical composition and/or the processing method. This, however, is undesirable because it will lead to a more complex production process and/or abrasive artificial lawn with an increased risk of injuries.
  • WO 2010/082816 A1 Another solution for the problem as described above is to adapt the geometry of the synthetic fibre, for example as disclosed in WO 2010/082816 A1 .
  • the fibre disclosed herein has such a geometry that it has an increased resistance to the loads applied thereon when playing a sport on the field.
  • the surface of the fibre however is smooth and in combination with used chemical compositions result in a shiny, non natural, synthetic look.
  • a fibre is disclosed comprising stiffness-enhancing agents. These agents, i.e. protrusion ribs, increase the fibre's stiffness/resilience and because of the non-smooth surface exhibits a light scattering effect, decreasing the synthetic fibre's shiny look.
  • a synthetic fibre of the monofilament type for use in an artificial lawn is provided in accordance with the features of claim 1, in particular for use in an artificial sports lawn, which synthetic fibre has a curved cross section, wherein the synthetic fibre has a centre line arc length (L) to maximum thickness (T) ratio (L/T) of between 4.5 and 3.8, and more preferably between 4.4 and 4.0.
  • the synthetic fibre has a convex surface radius (R1) to concave surface radius (R2) ratio (R1/R2) of less than 0.9. More particularly the convex surface radius (R1) to concave surface radius (R2) ratio (R1/R2) is between 0.6 and 0 and even more particular between 0.35 and 0.
  • the synthetic fibre has a linear mass density between 1000 dtex and 2500 dtex.
  • a synthetic fibre having stiffness-enhancing agents is known. These agents, arranged as protrusion ribs, increase the stiffness of the fibre.
  • the stiffness-enhancing agents are provided at a central axis of the fibre or at both ends of the wings of the fibre. These stiffness-enhancing agents do on the one hand increase the stiffness of the fibre but do on the other hand increase the risk of fracture or splitting of the fibre. This however is a unwanted side-effect of such a design.
  • the fibre is exposed to a large load applied thereon. As a result of such a large load the fibre exhibits material stress, which stress is concentrated on weak points of the fibre. These weak points are points where due to a non-smooth surface of the fibre the stress is concentrated.
  • ribs on a fibre exhibit a non-smooth transition at the point where the rib shape protrudes, a concentration of stress at this point will directly during use of the field, or inevitably after time, cause the fibre to fracture or split.
  • Known prior art fibres such as the fibre known from WO 2005/005730 A1 , have a certain thickness to centre line arc length ratio, which ratio, amongst others, determine properties/characteristics of the fibre such as flexibility, resilience and flexural strength.
  • this thickness is the maximum thickness, and is located at the central portion of the fibre (see reference “T” in figure 1a for example).
  • the centre line arc length is the length of the centre line (see reference “L” in figure 1a for example).
  • the length of this centre line arc is larger than the over all width (W) of the fibre.
  • the ratio of a fibre according to the invention is determined not by the width of the fibre but by the length of the centre arc line.
  • a synthetic fibre according to a first aspect or to the first and more of the above stated aspects of the invention has improved aesthetics (e.g., appearance) and mechanical properties and closely simulates natural turf.
  • prior art synthetic fibres show a non optimal stiffness upon a load applied thereon
  • a synthetic fibre according to an aspect of the invention having a L/T, R1/R2 ratio within the range of linear mass density as described above, has an increased optimal stiffness upon a load applied thereon.
  • the fibre exhibits increased and more optimal combination of resilience, flexibility, strength and stiffness.
  • the curved cross section has a central portion having a maximum thickness and tapered edges having a minimum thickness.
  • the fibre geometry of such a fibre thickness combination provides desirable balance of stiffness and flexibility, as well as of bending resilience of the fibre, preventing a flat orientation in the artificial lawn.
  • the cross sectional shape has a circular segment shaped cross section
  • the synthetic fibre has a convex side which is curved and a side formed by a straight line.
  • a synthetic fibre according to an aspect of the invention can be provided with a convex side and on the other side a line which is anywhere between a straight line and a strong concave line.
  • a synthetic fibre that is provided with a wave shaped pattern around the circumferential surface has, with respect to prior art fibres such as for example the fibre known from WO 2005/005730 , an increased stiffness, because all waves of the pattern do function as stiffness enhancements.
  • a further advantage lies in the smooth transitions of the surface contour having a multiple wave shaped pattern. This wave shaped pattern exhibits an increased stiffness without an increased risk of fracture or splitting of the fibre. All load applied on the fibre during use is divided along the whole surface of the fibre by the multiple waves. Because of this enhanced stress distribution, no stress concentration point exist on the surface of the fibre. It is therefore for a fibre having such a wave shaped pattern less likely to split or fracture.
  • the wave shaped pattern can also be arranged and extended continuously in the longitudinal direction.
  • the choice of the chemical composition is limited.
  • Several polymers can be used for the production of the fibres.
  • polyethylene, polypropylene, polyamide or a combination thereof can be used.
  • a fibre is produced from such a compositions it has a shiny effect over its surface. This shiny effect gives the fibre a non natural look.
  • a fibre having a wave shaped patterned surface does provide a solution to this problem. No change in chemical composition or use of additives is needed.
  • the wave shapes on the fibre surface have a significant light scattering effect, and therefore the fibre has a more "dull" look.
  • the wave patterned surface reflects light in different directions resulting in the light scattering effect.
  • the synthetic fibre can be provided with either a circular segment shaped cross section or a cross section having a convex side and a side formed by a straight line.
  • Fibre characteristics of an artificial fibre according to an aspect of the invention having a curved cross section with a maximum thickness central portion and tapered edges with a wave shaped pattern around its circumference can be further optimized by changing the amount of and/or adjusting its size/dimension of the wave shapes.
  • Increasing the amount of wave shapes will increase the light scattering effect, making the fibre more dull, and therefore more natural like.
  • Increase the size/dimension of the wave shapes will lead to an increased stiffness of the fibre, because the waves function as stiffness-enhancing means. Larger waves will exhibit a larger stiffness-enhancing effect.
  • the wave shaped pattern is a sine wave shaped pattern.
  • the advantage of a sine wave shaped pattern is that it has an even smoother wave transition in between the antinodes of the pattern. Therefore the fibre can resist an even greater load without losing stiffness and without an increased risk of splitting/fracture.
  • the wave shaped pattern on a convex side of the curved synthetic fibre has an equal, number of antinodes as that, on a concave side of the curved synthetic fibre.
  • the antinodes of the wave shaped pattern on the convex side of the curved synthetic fibre can be positioned opposite to the nodes of the wave shaped pattern on the concave side of the curved synthetic fibre.
  • the wave shaped pattern on the convex side of the curved synthetic fibre has a larger number of antinodes than that on the concave side of the curved synthetic fibre.
  • the number of antinodes on either the convex side or the concave side is at least 4 but not more than 30.
  • At least some waves of the wave pattern have different dimensions.
  • the characteristics of the fibre can be changed.
  • a combination of effects can be achieved. For example large waves can be alternated with small ones combining different effects like stiffness, light scattering effect, fibre resilience, and the like.
  • the synthetic fibre of the monofilament type for use in an artificial lawn is provided, in particular for use in an artificial sports lawn, which synthetic fibre has a curved cross section, wherein the circumferential surface of the synthetic fibre is provided with a wave shaped pattern.
  • the wave shaped pattern is arranged in the longitudinal direction of the fibre.
  • the invention also provides in an embodiment an artificial lawn, in particular an artificial sports lawn, comprising a substrate having artificial fibres according to any of the features described above attached thereto.
  • Fig. 1a shows in a cross sectional view a fibre not falling under the scope of the invention wherein with reference number 10a a synthetic/artificial fibre, for example a synthetic grass sports fibre is illustrated, which is preferably of a monofilament type obtained by an extrusion process.
  • a synthetic/artificial fibre for example a synthetic grass sports fibre is illustrated, which is preferably of a monofilament type obtained by an extrusion process.
  • the bending radius 10a6 or amount of curvature of the fibre 10a shown in figure 1a has an effect on the characteristics of the artificial lawn in which it is provided. Increasing the curvature will increase the flexural stiffness of the fibre, which as a result thereto will not unnecessarily assume a flat orientation in the artificial lawn of which the fibre 10a forms part. Increasing the stiffness, however, can decrease the playing characteristics of the artificial lawn because when played on, it can lead to an increased risk of injuries and in particular when sliding tackles are made thereon.
  • Figure 1a shows that the fibre 10a has a curved shape, which curve radius 10a6 shown in figure 1a is only indicative.
  • the ratio between the concave surface radius 10a7 (R2) and the convex surface radius 10a8 (R1) is in this embodiment less than 0.9, and preferably between 0.6 and 0, and even more preferably between 0.35 and 0.
  • the fibre shown in figure 1b has a flat surface at its concave side R2.
  • the fibres used therein should also have an optimal flexibility and resilience. Flexibility can prevent the fibre from splitting or fracture when undergoing high material stress when being played on. Resilience is needed for the fibre to re-assume an erect orientation after impact of forces applied thereon during play.
  • the fibre 10a shown in figure 1a is tapered near the edges 10a1a, 10a1b and reaches its maximum thickness at the centre portion 10a1c.
  • the fibre 10a shown here has relative thin edges 10a1a, 10a1b. Increasing this thickness will increase the stiffness of the fibre.
  • the edges 10a1a and 10a1b are preferably round.
  • the fibre 10 does therefore not only have non-sharp edges, which have a positive effect on the playing characteristics, it also decreases the risk of injuries when for example making a sliding or tackle.
  • the centre line arc length 10a6 of the fibre 10a disclosed in figure 1a is clearly larger than the thickness T 10a3, measured at the middle, central part 10a1c of the fibre.
  • the centre line arc length 10a6 is determined by, and defined as, the length of dotted line Rc 10a6 from one end of the fibre 10a1a to the other 10a1b.
  • the ratio (L/T) between the centre line arc length 10a6 and the maximum thickness 10a3 is between 4.5 and 3.8, and preferably between 4.4 and 4.0.
  • the linear mass density of a fibre according to an aspect of the invention is in the range between 1000 dtex and 2500 dtex.
  • the centre arc line length or thickness of a fibre according to an aspect of the invention can be calculated when the dtex and one of the centre arc line length and thickness is given.
  • the fibre is a fibre 10a having a L/T ratio as it is described above
  • the fibre 10a exhibits improved characteristics.
  • Study shows that especially the stiffness of a fibre 10a according to this aspects has substantially increased with respect to prior art fibres.
  • the fibre 10a characteristics are such that not only a sufficient resilience and flexibility is achieved, but also that it exhibits a flexural stiffness such that it will not unnecessarily assume a flat orientation in the artificial lawn, or the artificial grass sports field in case of a synthetic grass sports fibre of which the fibre 10a forms part of.
  • Such a fibre according to an aspect of the invention and according to figures 1a-1b are preferably made of polypropylene, polyethylene, polyamide, a copolymer, or a blend of one or more of the these polymers.
  • the fibre may therefore be made of rubber, which is permanently elastic synthetic polymer, or of a synthetic (co)polymer which will remain within the elastic range upon being subjected to a load.
  • the fibre 20 as shown in figure 2 being provided with a sine wave shaped pattern around the circumferential surface.
  • the sine wave shaped pattern is provided with nodes 21c and antinodes 21a, 21b.
  • the nodes 21c of the fibre function as stiffness-enhancing means and the size, amount and position can be changed to influence the stiffness needed for a particular artificial lawn.
  • the way the fibre 20 is provided with a sine wave shaped surface increases it's natural look.
  • Light rays striking the surface of the fibre 20 are directed in a different direction than the direction they originated from.
  • Parallel rays of light striking a fibre 20 according to the invention having a wave shaped surface will be directed to different directions.
  • the amount of waves/antinodes and nodes and the size/dimension of the waves influence this light scattering effect.
  • Study showed that a fibre 20 according to the invention which is provided with a wave shaped pattern as indicated in figure 2 has an increased light scattering effect and therefore such a natural look that it closely resembles real grass.
  • the fibre 20 shown in figure 2 has relative small and sharp edges 20a and 20b and an optimal L/T ratio of 3.8.
  • the concave side of the fibre 20 is provided with eight nodes 21c and seven antinodes 21a, 21b.
  • the other side which in this figure lies below the central portion 20c of the fibre 20, being the convex side of the fibre 20, is provided with ten nodes 21c and 9 antinodes 21a, 21b.
  • a fibre 70 has a curved cross section with a wave shaped pattern around the circumferential, however the fibre is, seen in cross sectional view, flat at one side.
  • the wave shaped pattern which in this embodiment is a sine shaped pattern, consists of nodes 71c and both negative antinodes 71b as well as positive antinodes 71a.
  • Such a sine shaped pattern will decrease the risk of splitting or fracture due to the smooth transitions at the nodes.
  • the flat side of an embodiment of the fibre 70 shown in figure 3 is provided with seven (both positive and negative) antinodes 71a, 71b and eight nodes 71c and on its convex side, the fibre 70 is provided with nine (both positive and negative) antinodes 71a, 71b and ten nodes 71c.
  • Figures 4 and 5 show a few embodiments of an artificial lawn such as an artificial grass sports field in which a synthetic fibre according to the invention can be used.
  • the artificial lawn comprises a backing 1, to which the several synthetic fibres 2 (corresponding to the fibres 20 and 70 shown in figures 2 and 3 ) are attached at the locations indicated by reference numeral 3, for example by tufting or weaving.
  • the extruded synthetic fibre 2 may be individually attached to the backing 1 or in a bundle of, for example twined, fibres 2a-2c.
  • the backing member in figure 4 has an open structure and is composed of a grid of supporting yarns 1a-1b, to which the synthetic fibres 2 are attached.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Artificial Filaments (AREA)
  • Woven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
EP12733231.0A 2011-07-01 2012-06-27 Synthetic fibre and an artificial lawn comprising such a fibre Active EP2726674B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12733231T PL2726674T3 (pl) 2011-07-01 2012-06-27 Włókno syntetyczne i sztuczny trawnik zawierający takie włókno

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE201120103403 DE202011103403U1 (de) 2011-07-01 2011-07-01 Synthetische Faser und Kunstrasen mit einer solchen Faser
US13/174,997 US10793973B2 (en) 2011-07-01 2011-07-01 Synthetic fibre and an artificial lawn comprising such a fibre
PCT/NL2012/050453 WO2013006042A1 (en) 2011-07-01 2012-06-27 Synthetic fibre and an artificial lawn comprising such a fibre

Publications (2)

Publication Number Publication Date
EP2726674A1 EP2726674A1 (en) 2014-05-07
EP2726674B1 true EP2726674B1 (en) 2019-04-10

Family

ID=46466809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12733231.0A Active EP2726674B1 (en) 2011-07-01 2012-06-27 Synthetic fibre and an artificial lawn comprising such a fibre

Country Status (10)

Country Link
EP (1) EP2726674B1 (zh)
KR (2) KR102373501B1 (zh)
CN (1) CN103764915B (zh)
AU (1) AU2012278394B2 (zh)
ES (1) ES2734059T3 (zh)
PL (1) PL2726674T3 (zh)
RU (1) RU2637261C2 (zh)
TR (1) TR201910153T4 (zh)
WO (1) WO2013006042A1 (zh)
ZA (1) ZA201400486B (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10793973B2 (en) * 2011-07-01 2020-10-06 Ten Cate Thiolon B.V. Synthetic fibre and an artificial lawn comprising such a fibre
CN108951363A (zh) * 2018-09-21 2018-12-07 张家港翔盛塑业科技有限公司 C形亚光加强型人造草丝
KR102357998B1 (ko) * 2021-07-09 2022-02-08 주식회사 지에스티지 천연잔디와 유사하도록 구성되는 인조잔디 및 그의 제조방법
KR102419294B1 (ko) * 2021-09-13 2022-07-12 주식회사 지에스티지 내구성과 치수정밀도가 향상된 천연잔디와 유사하도록 구성되는 인조잔디 및 그의 제조방법

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IT1320197B1 (it) 2000-05-25 2003-11-26 Mondo Spa Struttura di manto erboso sintetico, relativo materiale particellareed impiego del materiale particellare stesso.
WO2005005730A1 (en) * 2003-07-14 2005-01-20 Mattex Leisure Industries Artificial turf filament and artificial turf system
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Also Published As

Publication number Publication date
KR20140071325A (ko) 2014-06-11
TR201910153T4 (tr) 2019-08-21
WO2013006042A1 (en) 2013-01-10
AU2012278394B2 (en) 2016-10-27
AU2012278394A1 (en) 2013-05-09
RU2014101667A (ru) 2015-08-10
RU2637261C2 (ru) 2017-12-01
ES2734059T3 (es) 2019-12-04
KR20210005736A (ko) 2021-01-14
ZA201400486B (en) 2015-09-30
EP2726674A1 (en) 2014-05-07
CN103764915A (zh) 2014-04-30
KR102373501B1 (ko) 2022-03-10
PL2726674T3 (pl) 2019-09-30
CN103764915B (zh) 2017-03-08

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