Method for molding a body in a mold

Patent metadata

Field	Value
Publication number	US-2016158971-A1
Application number	US-201414908302-A
Country	US
Kind code	A1
Filing date	Jul 21, 2014
Priority date	Aug 1, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

Method for molding a body in a mold, comprising the steps of applying an adhesive tape ( 1 ) to the inside of a mold ( 4 ), distributing on the adhesive tape ( 1 ) the material layers ( 5 ) that form the body, curing the material layers ( 5 ), removing the body from the mold ( 4 ), wherein the adhesive tape ( 1 ) has a carrier film ( 10 ), onto one side of which a self-adhesive mass is dispensed, and the carrier film ( 10 ) contains one or at least two fluoropolymers.

First claim

1 . A process for the molding of a body in a mold, comprising the following steps:
application of an adhesive tape on the internal side of a mold distribution, on the adhesive tape, of the layers of material that form the body hardening of the layers of material removal of the body from the mold, where the adhesive tape comprises a backing foil onto one side of which a self-adhesive has been spread, and the backing foil comprises one or at least two fluoropolymers.

2 . The process as claimed in claim 1 ,
wherein the backing foil comprises 50% by weight of one or at least two fluoropolymers, based in each case on the entire composition of the backing foil, or the polymers forming the backing foil are composed of 100% by weight of one or at least two fluoropolymers.

3 . The process as claimed in claim 1 ,
wherein fluoropolymers used are PTFE (polytetrafluoroethylene), ETFE (poly(ethylene-co-tetrafluoroethylene)), FEP (poly(tetrafluoroethylene-co-hexafluoropropylene)), PVF (polyvinyl fluoride), PCTFE (polychlorotrifluoroethylene), ECTFE (poly(ethylene-co-chlorotrifluoroethylene), PVDF (poly(1,1-difluoroethene)), or PFA (perfluoroalkoxy polymers), or a mixture of two or more of the fluoropolymers mentioned.

4 . The process as claimed in claim 1 , wherein
the fluoropolymers have been mixed with other polymers selected from the group consisting of polyethylene terephthalate (PET), polyamides, polyurethanes, polyoxymethylene, polyvinyl chloride (PVC), polyethylene naphthalate (PEN), ethylene-vinyl alcohol (EVOH), polyvinylidene chloride (PVDC), polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polycarbonate (PC), polyamide (PA), polyether sulfone (PES), polyimide (PI), polyarylene sulfides, and polyarylene oxides.

5 . The process as claimed in claim 1 , wherein the thickness of the backing foil is from 15 to 350 μm.

6 . The process as claimed in claim 1 , wherein the adhesive applied on the backing foil is a pressure-sensitive adhesive.

7 . The process as claimed in claim 1 , wherein the backing foil is composed of an at least two-layer laminate made of two or more foil layers.

8 . The process as claimed in claim 1 , wherein the backing foil is composed of at least two foil layers, where the two exterior foil layers are of different color.

9 . The process as claimed in claim 1 , wherein the quantity of the adhesive applied to the backing foil is from 10 to 200 g/m 2 .

10 . The process as claimed in claim 1 , wherein the internal side of the mold is equipped with a release agent prior to application of the adhesive tape.

11 . The process as claimed in claim 1 , wherein the hardening of the layers of material takes place in vacuo.

Assignees

• Tesa Se

Inventors

• Bernt Stephan
• Kerep Patrick

Classifications

• B29C33/60 Primary

  Releasing, lubricating or separating agents {(in general C10M)} · CPC title

• B29C70/48

  and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM] {, e.g. by vacuum} · CPC title

• B29K2105/0872

  Prepregs · CPC title

• B29K2027/12

  containing fluorine · CPC title

• B29L2007/007

  Narrow strips, e.g. ribbons, tapes, bands (belts B29L2029/00; tapes as carrier of sound or information B29L2017/008) · CPC title