Method for molding a body in a mold

Abstract

Adhesive tape having a carrier material comprising the following layers: a textile composed of fibers having a softening point greater than or equal to 200° C., and coated with fluoropolymers or silicone polymers, to the top side of which textile a first film composed of fluoropolymers is applied over the whole surface and to the bottom side of which textile a second film is applied over the whole surface, wherein a self-adhesive mass is applied to one side of the carrier material.

Claims

1. A method comprising: applying an adhesive tape to an inner side of a mold; distributing at least one material layer over the adhesive tape; curing the at least one material layer, thereby forming a body; and removing the body from the mold, wherein: the adhesive tape comprises a self-adhesive mass and further comprises a carrier material comprising a textile; the textile comprises a top side, a bottom side, and at least one fiber comprising a coating; the at least one fiber has a softening point greater than or equal to 200° C.; the coating comprises at least one first fluoropolymer or at least one silicone polymer; a first film comprising at least one second fluoropolymer covers the whole of the top side; and a second film covers the whole of the bottom side.

2. The method as claimed in claim 1, wherein: the at least one second fluoropolymer is present at 50 wt. % relative to the total weight of the first film; or the first film consists of the at least one second fluoropolymer.

3. The method as claimed in claim 1, wherein the at least one first fluoropolymer is present and comprises a polytetrafluoroethylene (PTFE), a poly(ethylene-co-tetrafluoroethylene) (ETFE), a poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP), a poly(1,1-difluoroethene) (PVDF), a perfluoralkoxy polymer (PFA), or a mixture thereof.

4. The method as claimed in claim 1, wherein the coating further comprises a homopolymer of ethylene, a copolymer of ethylene, a propylene, a butylene, a polyethylene terephthalate (PET), a polyamide, a polyurethane, a polyoxymethylene, a polyvinyl chloride (PVC), a polyethylene naphthalate (PEN), an ethylene vinyl alcohol (EVOH), a polyvinylidene chloride (PVDC), a polyvinylidene fluoride (PVDF), a polyacrylonitrile (PAN), a polycarbonate (PC), a polyamide (PA), a polyethersulfone (PES), a polyimide (PI), a polyarylene sulfide, or a polyarylene oxide.

5. The method as claimed in claim 1, wherein at least one of the first film and the second film is between 15 and 350 μm thick.

6. The method as claimed in claim 1, wherein the textile is a non-woven fabric.

7. The method as claimed in claim 1, wherein the at least one fiber comprises a carbon fiber or a glass fiber.

8. The method as claimed in claim 1, wherein the textile further comprises a glass fiber fabric.

9. The method as claimed in claim 1, wherein the self-adhesive mass is based on an acrylate or a silicone.

10. The method as claimed in claim 1, wherein the self-adhesive mass has a mass application between 10 and 200 g/m.sup.2.

11. The method as claimed in claim 1, further comprising applying a release agent to the inner side before application of the adhesive tape.

12. The method as claimed in claim 1, wherein the at least one material layer is cured under a vacuum.

13. The method as claimed in claim 1, wherein the at least one second fluoropolymer comprises a polytetrafluoroethylene (PTFE), a poly(ethylene-co-tetrafluoroethylene) (ETFE), a poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP), a poly(1,1-difluoroethene) (PVDF), a perfluoralkoxy polymer (PFA), or a mixture thereof.

14. The method as claimed in claim 1, wherein the first film further comprises a homopolymer of ethylene, a copolymer of ethylene, a propylene, a butylene, a polyethylene terephthalate (PET), a polyamide, a polyurethane, a polyoxymethylene, a polyvinyl chloride (PVC), a polyethylene naphthalate (PEN), an ethylene vinyl alcohol (EVOH), a polyvinylidene chloride (PVDC), a polyvinylidene fluoride (PVDF), a polyacrylonitrile (PAN), a polycarbonate (PC), a polyamide (PA), a polyethersulfone (PES), a polyimide (PI), a polyarylene sulfide, or a polyarylene oxide.

15. The method as claimed in claim 1, wherein the textile is a woven fabric.

16. The method as claimed in claim 11, wherein the release agent comprises a polyvinyl alcohol or a silicone wax.

17. The method as claimed in claim 11, wherein the release agent is based on a silane or a siloxane.

18. The method as claimed in claim 8, wherein the glass fiber fabric comprises a coating of at least one third fluoropolymer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the figures:

(2) FIG. 1 shows the arrangement of the individual layers in the mold in a side view,

(3) FIG. 2 shows the arrangement of the individual layers in the mold from above, and

(4) FIG. 3 shows a simplified detail from FIG. 1.

(5) FIG. 1 shows the arrangement of the individual layers in the mold in a side view, and FIG. 2 shows the arrangement from above.

(6) The mold 4 is provided with a very thin layer, a few μm thick, of a release agent 6, for example a solvent-based suspension of low molecular weight PTFE, the thickness of which is not shown in the correct ratio in FIG. 1. The release agent is applied using a rag. The suspension then dries, resulting in a very thin film. The adhesive tape 1 is then applied in a layer to the inner side of the mold 4.

(7) In FIG. 3 it is shown that the edges of the individual strips of the adhesive tape 1, 2, 3 lie edge to edge, in other words have no gaps. The individual adhesive tape portions 1, 2, 3 consist of a carrier layer 10, to which an adhesive mass layer 11, in particular a self-adhesive mass, is applied.

(8) Following the gluing of the adhesive tape 1, the material layers 5 forming the body are distributed over the adhesive tape.

(9) A sealing film 21 is then fixed over the material 5 with the aid of a second adhesive tape 24 so that a closed space is produced.

(10) In FIG. 2 only half of the protective film 21 is shown. The protective film 21 is fixed on the mold 4 by the second adhesive tape 24.

(11) The air is removed through a discharge point 22. The resin is fed to the material layers 5 by means of an access point 23, until these material layers are saturated.

(12) The curing process is performed.

(13) When this is complete, the sealing film 21 is removed and the finished molded body can be removed from the mold 4.