Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B1/00—Layered products having a non-planar shape
  • B32B1/08—Tubular products
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L11/00—Hoses, i.e. flexible pipes
  • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2323/00—Polyalkenes
  • B32B2323/04—Polyethylene
  • B32B2323/046—LDPE, i.e. low density polyethylene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2323/00—Polyalkenes
  • B32B2323/10—Polypropylene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2597/00—Tubular articles, e.g. hoses, pipes

Definitions

• the invention concerns of multi layer tubes of polyolef ⁇ ne
• Main material demands for manufacture of tube systems piping components are following: high chemical resistence, high mechanical strength and technologicaly easy workability. Demands above result from following main needs: as long as possible life of piping systems at the lowest cost (price).
• the high chemical resistence giving long term corrosson resistence.
• the high mechanical strength is the main premise against long term mechanical stress (inner event, outer overpressure).
• the good workability is then the main condition for of stabile quality when respect piping components are manufactured, which includes various tube and tube f ⁇ tings in very wide diameter range generally.
• HDPE high density polyethylen
• PVC non softened polyvinylchlorid
• PP polypropylene
• LDPE low density polyethylene
• LLDPE linear low density polyethylene
• MDPE medium density polyethylene
• PEX net polyethylene
• PB polybuthylene
• This type of PP is a copolymer of propylene with some alfa defines , e.g. 1-hexen or 1- octen.
• This type PP has much lower tendency to be liable to brittle breakage destruction in comparisson with the other PP types thanks its modifyed cristaline phase.
• the main unadvantage uf this type of PP is the higher price in comparison with the others PP types.
• the biggest unadvantage currently used plastics materials up to now is their tendency to be liable to destruction at long term overpresure loading.
• the effort to eliminate this unadvantage led to development of three layer tubes with two shift- inner and outer surface plastic coating of metalc core (aluminium is mostly used).
• the metalic core of tube is manufactured by coiling of sheet core which increases essentially tube overpreassure resistance with no regard to water temperature. Coating of metalic core by pastic surfaces ensures then health unobjectionability and chemical resistence required. PB or net forming PE (PEX) is used for coating. Essential advantage of this tube is an easy instalation of the piping system (no fittings are almost required), the piping is formed downright on the site by simillar processing method as used when leaden tubes were installed with the same temperature and mechanical resistence.
• Multi layer tube of polyolefine in accordance with this invention eliminates these unadvantages currently used tubes of plastics, which have relatively low resistance against inner overpressure and considerably higher price when manufactured to provide better properties it means higher resistence to constant inner overpressure.
• the subject of the invention is multi layer tube of polyolefime consisting from two layers of different material concentric to centre line of the tube, where inner layer of the tube (i) is created by polyolefine assorted from a group containing material of low density polyethylene (a) of 0,910 to 0,930 g/cm density, linear low density polyethylene (b) of 0,915 to 0,940 g/cm density, high density polyethylene (c) of 0,940 to 0,975 g/cm 3 density, and of isotactic polypropylen (d).
• low density polyethylene a
• linear low density polyethylene b
• high density polyethylene c
• isotactic polypropylen d
• the second (outside) layer (ii) - outwards centre line of the tube is a mixture of polyolefines containing 50 % of mass polyolefines at least, which creats inner layer of the tube and 50 % at most of low density polyethylene (a) of density 0,910 up to 0,930 g/cm 3 and/or linear low density polyethylene (b) of 0,915 up to 0,940 g/cm3 density and/or high density polyethylene ( c ) of 0,940 to 0,975 g/cm density and/or isotactic polyprophylene (d)
• the tube of polyolefines in accordance with this invention described could also be made with three layers adventiously, when third layer outwards centre line contains 50% of polyolefines of (a) type at least and/or (b), and/or (c) and/or (d) , which is contained in polyolefine mixture in second layer (ii).
• Outer layer of rhe tube can contain 0.5 % up to 15 % anorganic pigment in accordance with the invention, which could consist of carbon or soot respectively, titan oxide, zinc oxide and/or it can contain also 0.1% to 1.5 % anorganic oxidant mass on the base of fenol substituted and/or 0,3 to 2.5% organic fosfid mass.
• anorganic pigment in accordance with the invention which could consist of carbon or soot respectively, titan oxide, zinc oxide and/or it can contain also 0.1% to 1.5 % anorganic oxidant mass on the base of fenol substituted and/or 0,3 to 2.5% organic fosfid mass.
• Multi layer tube principle design to the invention constitutes several polyolefine materials having a good inter phase adhesion and eliminates present most considerable unadventage plastics tubes represented by easy brittle breakage widening through tube wall cross section.
• the brittle breakage widening is possible to eliminate by appropriate combination of polyolefine materials fastening up concentricaly oriented other layers of inner wall, without essential price increasing.
• Another one advantage of multi layer polyolefine tubes to this invention is easy reachable weather resistance with tubes having the outer layer of temperature stabilized material, without any negative influence on hygienic properties of water, which could arise from reaction components and products of stabilizing penetrated into system of water conducting.
• Weather resistance of the tube invented is guaranted by anorganic pigments addition to eliminate effect of sun radiation. Titan oxide, zinc oxide and carbon in form of soot and/or antioxidants is used for this purpose. Creation of polyolefine precursors degradation is also possible to avoid by fenols substituted or synergic combination substituted fenols with organic fosfids.
• Another one of multi layer tube of polyolefine advantage in accordance with this invention is recycling of polyolefine remainders and scrap utilized for a new tubes production, without lost or decreasing of material properties.
• Recyclants utilizing is advantageous especially for tube outer layer manufacture under the supposition the inner wall of the tube is made of virgin polyolefine and penetration or difusion eventual deleterious substances from recyclate into conducted water is avoided.
• Mechanical properties improvement of recyclate of outer layer is possible by additives of polyolefine compatibilizators - ethylene copolymers especially.
• Polyolefine recyclantes exploitation as material for tube manufacture to this invention is advategeous from ecological point of view, also of valuation and energetical content utilization of this raw material.
• the optimal technology for manufacture of multi layer tubes in accordance with this invention is co extrusion.
• the two layer tube has been manufactured by co- extrusion of outside diameter 63 mms.
• Tube total wall thickness of 3 mms consisted of 1 mm inner layer of virgin low density polyethylene of 0,921 g/cm mass (commercial name Bralen FB 2-17) and outer layer of polyethylene recyclant mixture containing low and high density polyethylen in mass proportion of 2: 3.
• Material of outer layer has been added by 2.0% titan oxide of rutile type, 1,2 % soot, 0,2% fenolic antioxidant (commercial name Irganos 1010) and 0,6 % of organic fosfide (commercial name Irgafos 168).
• the tube manufactured has been tested on resistence against constant inner overpressure.
• Table no. 1 compares test results of constant inner overpressure resistance at 20°C and starting stress of 6,9 MPa of two layer tube described above, manufactured in accordance with invention with the tube manufactured of low density polyethylene Bralen FB 2-17. The comparison made in table shows that the time until rupture of two layer tube to the invention is practicaly the same as of the tube made from virgin low density polyethylene, in spite of it that this two layer tube was made of less valuable material (recyclante).
• the two layer tube has been manufactured by co- extrusion of outside diameter 63 mms.
• Tube total wall thickness of 3 mms consisted of 1,2 mm inner layer of virgin low density polyethylene of 0,919 g/cm 3 mass (commercial name Bralen RA 2-19) and outer layer of waste polyolefine recyclante mixture containing low and high density polyethylen and izotactic polypropylen in mass proportion of 3 : 2 : 2.
• the tube manufactured has been tested on resistence against constant inner overpressure. Table no.
• the three layer tube has been manufactured by co- extrusion of outside diameter 75 mms.
• the tube manufactured has been tested on constant overpressure resistence . Comparison of tests is made in Table 3.
• Multilayer tubes of polyolefine to this invention are available as components for inside and outside water conduit piping and draining systems in civil engineering also as protection components of cabel distribution systems , in chemical and food industry as well as piping systems of fluid and gas conveying in many industrial branches.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Laminated Bodies (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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ID=5473332

Family Applications (1)

Country Status (3)

Cited By (5)

Families Citing this family (2)

Citations (4)

• 2001
  • 2001-03-29 CZ CZ20011163A patent/CZ293343B6/cs unknown
• 2002
  • 2002-03-29 EA EA200301074A patent/EA005477B1/ru not_active IP Right Cessation
  • 2002-03-29 WO PCT/CZ2002/000019 patent/WO2002078952A1/en not_active Ceased

Patent Citations (4)

Non-Patent Citations (1)

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