Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
  • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
  • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
  • B29C44/1209—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements by impregnating a preformed part, e.g. a porous lining
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
  • B29C44/34—Auxiliary operations
  • B29C44/36—Feeding the material to be shaped
  • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
  • B29C44/385—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using manifolds or channels directing the flow in the mould

Definitions

• the invention relates to a hollow chamber profile with a polyurethane foam and a method for producing a hollow chamber profile foamed with a polyurethane foam.
• hollow chamber profiles e.g. B. Rechornenpro file
• a foam or simple pipes for. B. for ski poles
• Double pipes with a thermal insulation foam arranged between them are also known.
• the reaction mixture is either introduced by means of a mixing head drawn through the space between the tubes, or it is applied to a paper strip outside the tube and this is drawn evenly into the cavity to be foamed (Kunststoff Handbuch, Volume 7, “Polyurethane", 3rd edition, Carl Hanser Verlag Kunststoff-Vienna, page 283; ISBN 3-446-16263-1)
• the carrier material insert serving as the carrier strip and retractable into the hollow chamber together with the reaction mixture prevents, due to its permeability delayed by the said time period, the carrier material insert from being penetrated even before the reaction mixture is introduced into the hollow profile. So no polluting stripping of
• reaction mixture take place at the profile entrance.
• the existing permeability but delayed by the said time period, ensures that, after being introduced into the hollow chamber, this reaction mixture, when foaming, or even before it, can penetrate the support material insert and thus, on the other hand, with the inner wall of the hollow chamber during curing quality
• the carrier material insert preferably consists of a nonwoven fabric, a textile fabric, such as linen or cotton, or a paper with a correspondingly delayed permeability.
• Suitable carrier material deposits can best be determined empirically due to the many influencing factors. If one assumes, based on experience, that the reaction mixture has a viscosity of 100 to 800 mPs before or until it is introduced into the hollow chamber, carrier materials which consist of polyester nonwovens with a basis weight between 30 and 60 g have proven to be particularly suitable / m 2 exist and have thicknesses of 0.4 to 0.6 mm. Of course, the fiber thickness also has an impact. Dense fabrics, such as bleached and washed cotton fabrics, with basis weights of 200 to 300 g / m 2 are also suitable. Experiments have shown that, under the conditions mentioned, such carrier materials can retain the liquid reaction mixture for about 5 to 20 seconds before it begins to drip through. When choosing the correct feed speed and the correct distance of the mixture feed point from the profile entrance, there are no difficulties
• a further special embodiment is characterized in that the side edges of the carrier material insert are raised in a trough-like manner.
• the side edges are folded up, in particular when the profile is narrow. This prevents the reaction mixture from running off laterally over the edges of the carrier insert before being introduced into the hollow chamber.
• the side edges should not be too high, otherwise there is a risk that the rising foam, due to its increasing viscosity, will no longer be able to penetrate the side edges in the upper area and that there will therefore be no liability in this area between the foaming and the inner wall of the profile.
• this risk does not generally exist because the reaction mixture is applied along the middle and cannot flow as far to the side before it is introduced. In this case it is not necessary to erect the side edges.
• the starting components on which the foaming is based of the reaction mixture used have high proportions of long-chain polyols and / or di- and / or isocyanate polymers.
• the process for producing the new hollow chamber profile is based on a hollow chamber profile foamed with polyurethane foam
• a liquid reaction mixture is applied to the carrier material insert, while at the same time the carrier material insert together with the reaction mixture is drawn into the hollow chamber profile at a uniform speed.
• the novelty can be seen in the fact that a carrier material insert is used which has a delayed permeability for the reaction mixture, this delay interval lasting from the time when the reaction mixture is introduced until it is introduced into the hollow chamber profile, and that the carrier material insert then becomes permeable for the reaction mixture and the foam that forms adheres to the inside wall of the profile everywhere over the profile cross-section.
• a rod For pulling in the carrier material, for example, a rod is used which can be pushed back and forth on a downstream toothed rack by means of a driven pinion. Also a windable link chain, which in the
• Pivot points z. B. has protruding tabs sufficient rigidity when sliding on the lower inner wall of the profile is conceivable.
• a carrier material insert made of a nonwoven fabric, a textile fabric, such as linen or cotton fabric, or of paper is preferably drawn in.
• the side edges of the carrier material insert are aligned upwards before the reaction mixture is fed in.
• the starting components of the reaction mixture on which the foaming is based are those with high proportions of long-chain polyols and / or di- and / or isocyanate polymers.
• Fig. 2 shows the hollow chamber profile in cross section
• Fig. 3 shows a device for producing this hollow chamber profile in the side view in partial section.
• FIG. 1, 2 there is an essentially rectangular hollow chamber profile 1 made of a window frame profile made of plastic, namely from colored PVC.
• the hollow chamber profile 1 is only shown as a simple rectangular profile.
• a thermally insulating foam 2 made of polyurethane foam is arranged within the hollow chamber profile 1.
• this shows a carrier material insert 3 made of a polyester nonwoven fabric, which in its original state has a basis weight of 40 g / m 2 and a thickness of 0.5 mm.
• the side edges 6 of the carrier material insert 3 are approximately
• the hollow chamber profile 1 is moved out laterally by means of a carriage 18 arranged underneath and closed on both sides with flaps 19.
• the reaction mixture 15 now foams up and hardens to form the foam 2, which has good adhesion to the inner wall 4 of the hollow chamber profile 1 everywhere.
• the carrier material insert 3 changes its position, which is of no importance.
• the flaps 19 are opened and the foamed hollow chamber profile 1 is finished and is removed.
• a new hollow section 1 is placed on the carriage 18 and this is moved together with the hollow section 1 back to the filling position, etc.

Landscapes

• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Laminated Bodies (AREA)
• Polyurethanes Or Polyureas (AREA)
• Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=26055116

Family Applications (1)

Country Status (13)

Families Citing this family (5)

Family Cites Families (2)

• 2000
  • 2000-06-28 DE DE10031568A patent/DE10031568A1/de not_active Withdrawn
  • 2000-09-18 IL IL14831500A patent/IL148315A0/xx unknown
  • 2000-09-18 AU AU76576/00A patent/AU7657600A/en not_active Abandoned
  • 2000-09-18 RU RU2002111675/12A patent/RU2002111675A/ru not_active Application Discontinuation
  • 2000-09-18 JP JP2001526351A patent/JP2003527253A/ja active Pending
  • 2000-09-18 EP EP00966044A patent/EP1222064A1/de not_active Withdrawn
  • 2000-09-18 PL PL00354141A patent/PL354141A1/xx not_active IP Right Cessation
  • 2000-09-18 HU HU0202887A patent/HUP0202887A2/hu unknown
  • 2000-09-18 WO PCT/EP2000/009091 patent/WO2001023162A1/de not_active Application Discontinuation
  • 2000-09-18 BR BR0014432-0A patent/BR0014432A/pt not_active Application Discontinuation
  • 2000-09-18 CN CN00813666.1A patent/CN1377308A/zh active Pending
  • 2000-09-18 CA CA002384500A patent/CA2384500A1/en not_active Abandoned
• 2002
  • 2002-03-21 NO NO20021428A patent/NO20021428L/no unknown

Non-Patent Citations (1)

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