EP3978709A1 - Profile for manufacturing a slat for a rollable swimming pool cover and rollable swimming pool cover - Google Patents

Profile for manufacturing a slat for a rollable swimming pool cover and rollable swimming pool cover Download PDF

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Publication number
EP3978709A1
EP3978709A1 EP21196596.7A EP21196596A EP3978709A1 EP 3978709 A1 EP3978709 A1 EP 3978709A1 EP 21196596 A EP21196596 A EP 21196596A EP 3978709 A1 EP3978709 A1 EP 3978709A1
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EP
European Patent Office
Prior art keywords
plastic
profile
layer
top wall
plastic composition
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.)
Pending
Application number
EP21196596.7A
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German (de)
English (en)
French (fr)
Inventor
Ludo VERVOORT
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.)
Technics & Applications Afgekort T&a BV
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Technics & Applications Afgekort T&a 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
Application filed by Technics & Applications Afgekort T&a BV filed Critical Technics & Applications Afgekort T&a BV
Publication of EP3978709A1 publication Critical patent/EP3978709A1/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H4/00—Swimming or splash baths or pools
    • E04H4/06—Safety devices; Coverings for baths
    • E04H4/08—Coverings consisting of rigid elements, e.g. coverings composed of separate or connected elements
    • E04H4/082—Coverings consisting of rigid elements, e.g. coverings composed of separate or connected elements composed of flexibly or hingedly-connected slat-like elements, which may or may not be wound-up on a fixed axis

Definitions

  • the present invention concerns a profile for manufacturing a slat for a rollable swimming pool cover and a rollable swimming pool cover, more in particular a rollable swimming pool cover which is made from such profiles.
  • Such profiles and swimming pool covers are known from, for example, AU-A-21669/95 , FR2761711A1 , DE29604839U1 and FR2719622A1 .
  • the underside of the profiles is black and the upper side is transparent, such that overheating of the upper side is avoided, but sunlight is maximally absorbed by the underside of the profiles, whereby this heat can be released again to the swimming pool water to thereby heat up the swimming pool water. Beause of the black underside this also limits algae growth in the swimming pool and/or this algae growth is not visible.
  • Such profiles are also called 'Solar' profiles.
  • Such profiles and swimming pool covers are known from, for example, DE3044949A1 and DE4101727A1 .
  • top walls and optionally the side wall of the groove are opaque, such that little or no sunlight can enter the groove and algae development is limited and avoided. Also, because of this, contaminations in the grooves, such as leaves and dead insects, are hidden from view.
  • Such profiles and swimming pool covers are known from, for example, DE19646117C1 , DE10103204A1 and EP2295676B1 .
  • these profiles have the disadvantage that, when they are assembled into a swimming pool cover, the upper side of this swimming pool cover does not look homogeneous, but rather striped. This is the case because the top wall of the profile at the location of the groove is black or because at the location of the groove a black wall lies close below a transparent top wall, while at other locations than the groove the black bottom wall is located at a much larger distance from the transparent top wall. This means that the black colour at the location of the groove is much more explicitly visible than in other locations, resulting in a striped, zebra-like pattern.
  • the present invention concerns a profile for manufacturing a slat for a rollable swimming pool cover, wherein the profile is made of plastic, wherein the profile comprises one or more internal hollow channels, which extend in the profile direction, wherein the profile has a first top wall located above the one or more hollow channels, wherein the profile has a bottom wall under the one or more hollow channels, wherein the first top wall and the bottom wall are interconnected by two or more connecting walls, wherein the profile is provided on a first side with a groove for receiving a coupling member to thereby allow lateral coupling of profiles, whereby the groove extends in the profile direction, the groove having a second top wall, whereby the second top wall comprises a first opaque layer of plastic made of a first plastic composition, wherein the bottom wall comprises a second opaque layer of plastic made of a second plastic composition, wherein the first plastic composition is different from the second plastic composition.
  • Such a profile has the advantage that, at a given colour of the bottom wall, which is traditionally but not necessarily black, and at given optical properties such as the colour, light transmittance and the degree of light reflection of the first top wall, the colour, and/or other optical properties such as the light transmittance and the degree of light reflection, of the second top wall can be adjusted independently of the bottom wall such that the occurrence of said striped zebra-like pattern can be limited or avoided, while still, because this second top wall is opaque, light is prevented from entering the groove such that algae growth in the groove is limited.
  • the absorption of sunlight by the first layer can be reduced in comparison with the known black top walls of the groove, such that excessive heating of the second top wall, and therefore warping, of the profiles is limited.
  • profile direction is the direction in which the cross-section of the profile remains the same.
  • plastic compositions a composition comprising one polymer or two or more mixed polymers and optionally comprising one or more additives which are mixed with the polymer or polymers to adjust the mechanical and/or optical and/or chemical properties of the polymer or polymers.
  • a plastic composition is therefore different from another plastic composition if the nature and/or concentration of one or more of the polymer or polymers or additives is different.
  • a layer is meant a volume within which the plastic composition is homogeneous and which differs from adjacent volumes.
  • the profile is an extruded profile made of polycarbonate.
  • the first top wall is free of a layer made of said first plastic composition or second plastic composition.
  • the first top wall has at least 30%, and preferably at least 40%, light transmittance such that a significant heating of the swimming pool water by the sunlight can take place.
  • the second top wall is translucent, but not transparent. This has the advantage that droplets of condensation water, which can form on the inside of the profiles due to condensation of water vapor and which are unattractive, are invisible.
  • the first plastic composition has a first colour and the second plastic composition has a second colour, the first colour and the second colour being different.
  • the second colour preferably has a V-value in the HSV-colour space that is at most 0.40, and that is preferably at most 0.20.
  • the second colour is black.
  • a colour space is a model for characterizing a colour by means of usually three parameters.
  • the most well-known colour spaces are HSV, also known as HSB, HSL, RGB and CMY.
  • the HSV-colour space has the advantage of being the most intuitive, hence, best matches how people perceive colour. Colours that are characterized in one of these colour spaces can be converted via known mathematical relationships to a characterization in another colour space.
  • the first colour has a first V-value in the HSV-colour space and the second colour has a second V-value in the HSV-colour space, wherein the first V-value is at least 10 percentage points higher than the second V-value, wherein preferably the first V-value is at least 15 percentage points higher than the second V-value.
  • the first colour is lighter than the second colour, because it is closer to the upper side of the profile than the second colour, such that from the upper side, seen through the first top wall, the colours look more similar.
  • the first colour and the second colour both have an S-value in the HSV-colour space, wherein the S-values of both the first colour and the second colour are both lower than 50%.
  • the colours are not very bright, such that the creation of a striped pattern is suppressed.
  • the second top wall also comprises a layer of plastic made of a plastic composition other than the first plastic composition, wherein the first opaque layer of plastic forms the bottom layer of the second top wall.
  • the formation of a striped pattern can be avoided even better. This is in particular the case when such a layer of plastic with a different plastic composition than the first plastic composition is present both in the first top wall and in or on top of the second top wall.
  • the first top wall comprises a third layer of plastic made of a third plastic composition, wherein the third plastic composition is different from the first plastic composition and is different from the second plastic composition.
  • the third layer of plastic is also located in the second top wall on top of the first opaque layer or in another wall that is located above the second top wall.
  • the third layer of plastic is preferably a layer that is transparent, optionally provided with a light colouring.
  • the first top wall comprises a fourth layer of plastic made of a fourth plastic composition, wherein the fourth plastic composition is different from the first plastic composition and is different from the second plastic composition and is different from the third plastic composition.
  • the fourth layer of plastic is also located in the second top wall on top of the first opaque layer or in another wall located above the second top wall.
  • the fourth layer is preferably located on top of the third layer.
  • the fourth plastic composition preferably comprises a UV blocking agent to protect the fourth plastic layer and the other underlying parts of the profile from UV light aging.
  • the fourth plastic composition preferably includes light-reflecting particles to impart an attractive metallic, glossy appearance to the profile. This gloss also helps visually reducing a striped pattern.
  • the fourth plastic composition comprises such a low concentration of said light-reflecting particles that the light transmittance of the first top wall is at least 30%, and preferably at least 40%.
  • the groove has a side wall on a side facing the one or more internal hollow channels, wherein a portion of this side wall, adjacent to the second top wall, comprises a fifth opaque layer of plastic made of said first plastic composition.
  • the fifth opaque layer of plastic preferably also forms the surface of said portion of the side wall that faces the groove.
  • the bottom portion of the side wall of the groove comprises a sixth opaque layer of plastic made of said second plastic composition, wherein the sixth layer of opaque plastic and the fifth layer of opaque plastic in the side wall taken together extend continuously from the bottom wall to the first opaque layer of plastic.
  • this side wall is provided with an opaque layer of plastic over its entire height, such that light cannot penetrate into the groove via any point of this side wall.
  • the bottom wall consists only of said second opaque layer.
  • the profile is provided on a second side with a coupling member which is adapted to be inserted into the groove of another such profile in order to thereby couple two profiles hingedly laterally to each other, the coupling member comprising an opaque layer of plastic, wherein the coupling member is preferably made of the second plastic composition.
  • the coupling member in coupled condition, also forms a blockage which prevents light from entering the groove via a space between two profiles.
  • the first plastic composition has a first colour and the third plastic composition or fourth plastic composition has a third colour, wherein the first colour has a first V-value and a first S-value and a first H-value in the HSV-colour space, wherein the third colour has a third V-value and a third S-value and a third H-value in the HSV-colour space, wherein the difference between the first V-value and the third V-value is at most 40 percentage points, wherein the difference between the first S-value and the third S-value is at most 40 percentage points and wherein the absolute value of ((first H-value - third H-value) modulo 360°) is less than 90°, wherein, in case there is no fourth layer of plastic or the fourth layer of plastic is colourless, the third plastic composition has said third colour and wherein, in other cases, the fourth plastic composition has said third colour.
  • the third plastic composition has said third colour
  • the fourth plastic composition has said third colour
  • the top wall is at least partially transparent but also coloured and is the first colour chosen such that it does not deviate much from the colour of the top wall, in order to avoid the zebra effect.
  • the invention also relates to a rollable swimming pool cover comprising two or more profiles according to the invention that are laterally mutually coupled.
  • the profile 1 shown in the figures has a total width B of 73 mm and a total height H of 14 mm. The relative dimensions of the various parts of the profile 1 are correctly shown in the figures.
  • the profile 1 extends in a profile direction P.
  • the profile 1 On a side, the profile 1 is provided with a coupling member 2 with a double hook shape. On the opposite side, the profile 1 is provided with a groove 3 which can receive such a coupling member 2, such that such profiles 1 can be laterally mutually coupled to form a swimming pool cover.
  • the profile 1 comprises a bottom wall 4 and a first top wall 5 and a second top wall 6.
  • the first top wall 5 is connected to the bottom wall 4 by means of four connecting walls 7 which define three closed hollow channels 8 between the bottom wall 4 and the first top wall 5.
  • One of the connecting walls 7, in this example the rightmost connecting wall, also forms the side wall 9 of the groove 3.
  • the second top wall 6 is located above the groove 3 and is the top wall of this groove 3.
  • the first top wall 5 and the second top wall 6 together form a slightly curved common top wall without kink or angle at the junction between the first top wall 5 and the second top wall 6.
  • the bottom wall 4 extends in this example under both the hollow channels 8 and under the groove 3.
  • the profile 1 comprises four different plastic compositions, as will be explained below, and in this example, but not necessarily, is made of polycarbonate, and is made by means of coextrusion of the four plastic compositions.
  • the second top wall 6 consists of three layers of plastic and the first top wall 5 consists of two layers of plastic.
  • the bottom layer of the second top wall 6, hereinafter referred to as the first layer 10 of plastic is made of a first plastic composition.
  • This first layer 10 of plastic is opaque, that is to say, it does not transmit light, and has a first colour.
  • the first colour is a medium gray RAL-colour 7004. In the HSV-colour space this corresponds to a first H-value of 0°, a first S-value of 0 and a first V-value of 61%.
  • the bottom wall 4 consists of one layer of plastic, hereinafter referred to as the second layer 11 of plastic, which is made of a second plastic composition.
  • This second layer 11 of plastic is opaque and has a second colour, which in this example is black, and hence in the HSV-colour space has a second H-value of 0°, a second S-value of 0 and a second V-value of 0.
  • the bottom layer of the first top wall 5, hereinafter referred to as the third layer 12 of plastic is made of a third plastic composition, and continues into the second top wall 6, said third layer 12 of plastic forming the intermediate layer of the second top wall 6.
  • This third layer 12 of plastic is transparent.
  • the top layer of the first top wall 5, hereinafter referred to as the fourth layer 13 of plastic is made of a fourth plastic composition, and continues into the second top wall 6, said fourth layer 13 of plastic also forming the top layer of the second top wall 6.
  • This fourth layer 13 of plastic is substantially transparent with a gray metallic lustre and contains an additive that blocks UV light.
  • the coupling member 2, just like the bottom wall 4, is made of the second plastic composition.
  • the upper part of the side wall 9 of the groove 3 consists of two layers, more specifically a layer of plastic which is located on the side of the hollow channels 8 and which is made of the third plastic composition and which adjoins the third layer 12 of plastic, and a layer, hereinafter referred to as the fifth layer 14 of plastic, located on the side of the groove 3.
  • This fifth layer 14 is made of the first plastic composition and is therefore opaque.
  • the fifth layer 14 of plastic adjoins the first layer 10 of plastic such that together they form a continuous layer made of the first plastic composition.
  • the first layer 10 of plastic and the fifth layer 14 of plastic have a thickness of approximately 0.2 mm.
  • the fourth layer 13 of plastic has a thickness of approximately 0.15 mm.
  • the total wall thickness of the first top wall 5, the second top wall 6 and the bottom wall 4 is approximately 0.9 mm.
  • the bottom part of the side wall 9 of the groove 3 consists of one layer of plastic, hereinafter referred to as the sixth layer 15 of plastic, which is made of the second plastic composition and is therefore opaque.
  • the sixth layer 15 of plastic adjoins without interruption the second layer 11 of plastic.
  • the fifth plastic layer 14 of plastic and the sixth layer 15 of plastic adjoin each other without interruption, such that the entire side wall 9 of the groove 3 is opaque, as is the second top wall 6 and the bottom wall of the groove 3.
  • the bottom part of the connecting walls 7 is made of the second plastic composition and the top part of the connecting walls 7 is made of the third plastic composition.
  • said top part is at least as high as said bottom part, such that the black colour of the bottom part of the connecting walls 7 cannot, or only to a very limited extent, be seen from above.
  • the four plastic compositions are the following:
  • the first plastic composition consists of opaque polycarbonate with added colorants to obtain RAL-colour 7004.
  • the second plastic composition consists of polycarbonate with added 0.5% carbon black.
  • the third plastic composition consists of transparent polycarbonate.
  • the fourth plastic composition consists of transparent polycarbonate with 3% gray metallic masterbatch and an additive that blocks UV light.
  • This masterbatch has RAL-colour 9007. In the HSV-colour space, this corresponds to an H-value of 60°, an S-value of 4% and a V-value of 53%.
  • the average light transmittance of the first top wall 5 is 42% in the interval 380nm to 750nm. This was measured using a Shimadzu UV-1800 spectrofotometer according to standard NBN EN ISO 13468-2 : 2006.
  • the first layer 10 is designed in a lighter colour than the second layer 11, i.e. the bottom wall 4, it is largely or completely avoided that a zebra-like pattern of dark lines and light lines is formed in the swimming pool cover.
  • the first layer 10 of plastic should have in order, at given colours of the second layer 11 of plastic and/or the third layer 12 of plastic and/or the fourth layer 13 of plastic, to have the lowest possible zebra effect.
  • the first H-value may only deviate slightly from the second H-value, that the two S-values are preferably limited, and that the first V-value is higher than the second V-value.
  • the H-value, V-value and S-value of the colour of the third layer 12 of plastic or the fourth layer 13 of plastic are preferably only slightly deviating from the first H-value, the first S-value and the first V-value.
  • a second embodiment of a profile according to the invention differs from the profile described above in that the fourth plastic composition has the transparent RAL-colour 110 70 70-P-T, also to be referred to as the third colour, and in that the first plastic composition has a first colour which is the non-transparent RAL-colour 110 50 55-P.
  • the third colour RAL 110 70 70-P-T corresponds in the HSV-colour space to a third H-value of 66°, a third S-value of 100% and a third V-value of 69%.
  • the first colour RAL 110 50 55-P corresponds in the HSV-colour space to a first H-value of 65°, a third S-value of 100% and a third V-value of 49%.
  • the light transmittance of the first top wall 5 of the alternative profile is 52%, measured in the aforementioned way.
  • the third layer 12 and the fourth layer 13 of plastic are arranged in the second top wall 6, it is also possible that the top wall of the profile is located at some distance from the top wall of the groove, as is the case, for example, in the profile of figure 5 of AU-A-21669/95 and figure 1 of EP2295676B1 , such that, in that case, the third layer 12 and fourth layer 13 of plastic also can be arranged in a wall above the second top wall, hence in the top wall of the profile above the top wall of the groove.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
EP21196596.7A 2020-09-30 2021-09-14 Profile for manufacturing a slat for a rollable swimming pool cover and rollable swimming pool cover Pending EP3978709A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE20205674A BE1028659B1 (nl) 2020-09-30 2020-09-30 Profiel voor het vervaardigen van een lamel voor een oprolbare zwembadafdekking en oprolbare zwembadafdekking

Publications (1)

Publication Number Publication Date
EP3978709A1 true EP3978709A1 (en) 2022-04-06

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EP21196596.7A Pending EP3978709A1 (en) 2020-09-30 2021-09-14 Profile for manufacturing a slat for a rollable swimming pool cover and rollable swimming pool cover

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EP (1) EP3978709A1 (nl)
BE (1) BE1028659B1 (nl)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044949A1 (de) 1980-11-28 1982-07-01 Georg 8000 München Almer Rolladen zum abdecken von fluessigkeitsbecken
DE4101727A1 (de) 1991-01-22 1992-07-30 Hans Heinz Helge Rolladenprofilstab
FR2719622A1 (fr) 1994-05-09 1995-11-10 Beloou Philippe Installation de couverture immergée de piscine.
AU2166995A (en) 1994-07-05 1996-01-18 Remco Roller Shutters (Aust) Pty Ltd Swimming pool cover and slat end cap arrangement
DE29604839U1 (de) 1996-03-15 1996-06-13 Melichar, Roland, 82549 Königsdorf Profilleiste für Schwimmbadabdeckungen und damit gebildete Schwimmbadabdeckung
DE19646117C1 (de) 1996-11-08 1998-06-10 Helge Hans Heinz Solarrolladen für Schwimmbadeabdeckungen
FR2761711A1 (fr) 1997-04-03 1998-10-09 Daniel Hebert Lame pour tablier de couverture de piscine comportant une levre de recouvrement et tablier obtenu
DE10103204A1 (de) 2001-01-24 2002-07-25 Hans-Heinz Helge Profil zum Separieren eines Raumes und Verfahren zur Herstellung des Profils sowie dessen Verwendung
EP2295676B1 (de) 2009-08-20 2017-11-22 Hans-Heinz Helge Solarprofil für Schwimmbadabdeckungen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044949A1 (de) 1980-11-28 1982-07-01 Georg 8000 München Almer Rolladen zum abdecken von fluessigkeitsbecken
DE4101727A1 (de) 1991-01-22 1992-07-30 Hans Heinz Helge Rolladenprofilstab
FR2719622A1 (fr) 1994-05-09 1995-11-10 Beloou Philippe Installation de couverture immergée de piscine.
AU2166995A (en) 1994-07-05 1996-01-18 Remco Roller Shutters (Aust) Pty Ltd Swimming pool cover and slat end cap arrangement
DE29604839U1 (de) 1996-03-15 1996-06-13 Melichar, Roland, 82549 Königsdorf Profilleiste für Schwimmbadabdeckungen und damit gebildete Schwimmbadabdeckung
DE19646117C1 (de) 1996-11-08 1998-06-10 Helge Hans Heinz Solarrolladen für Schwimmbadeabdeckungen
FR2761711A1 (fr) 1997-04-03 1998-10-09 Daniel Hebert Lame pour tablier de couverture de piscine comportant une levre de recouvrement et tablier obtenu
DE10103204A1 (de) 2001-01-24 2002-07-25 Hans-Heinz Helge Profil zum Separieren eines Raumes und Verfahren zur Herstellung des Profils sowie dessen Verwendung
EP2295676B1 (de) 2009-08-20 2017-11-22 Hans-Heinz Helge Solarprofil für Schwimmbadabdeckungen

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Publication number Publication date
BE1028659B1 (nl) 2022-05-02
BE1028659A1 (nl) 2022-04-25

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