Device for injecting a resin into at least one fibre layer of a fibre-reinforced product to be manufactured
The invention provides a device for injecting a resin into at least one fiber layer of a fiber-reinforced product ( 5 ) to be manufactured, comprising a mold ( 2, 3 ) having a mold cavity ( 4 ) that is surrounded by a mold wall for abutment of the product thereagainst in the closed condition of the mold. A rigid part ( 3 a, 3 b, 3 c, 3 d ) of the mold wall is movable with respect to another part of the mold wall in the closed condition of the mold so as to ensure a continued abutment of the movable part of the mold wall with the products when shrinkage of the resin caused by curing thereof takes place subsequent to the injection process.
1. A device for injecting under an elevated pressure a resin into at least one fibre layer of a fibre-reinforced hollow product to be manufactured, comprising:
a mould having a mould cavity that is surrounded by a mould wall for abutment of the fibre-reinforced hollow product thereagainst in a closed condition of the mould, a rigid part of the mould wall being movable with respect to another part of the mould wall in the closed condition of the mould to ensure a continued abutment of the movable part of the mould wall with the fibre-reinforced hollow product when shrinkage of the resin caused by curing thereof takes place subsequent to the injection process; and
a pressure unit for pressing the movable part of the mould wall against the fibre reinforced hollow product upon shrinkage of the resin,
wherein the mould includes an inner mould to be positioned in a cavity of the fibre-reinforced hollow product and an outer mould to be positioned on an outer side of the product, and at least a rigid part of the inner mould is movable in the closed condition of the mould,
wherein a mould wall of the inner mould comprises rigid mould wall segments interconnected by a flexible material,
wherein the pressure unit comprises a pressure chamber on a side of the movable part of the mould wall remote from the fibre-reinforced hollow product for pressing the movable part of the mould wall against the fibre-reinforced hollow product upon shrinkage of the resin under the influence of the pressure that prevails within the pressure chamber, and
wherein the pressure chamber at least substantially adjoins the entire circumference of the inner mould.
2. A device according to claim 1 , wherein said flexible material is resilient.
3. A device according to claim 1 , wherein the mould is provided with heating channels for heating fluid by means of which the fibre-reinforced hollow product in the mould can be heated.
4. A device according to claim 1 , wherein the mould is provided with cooling channels for a coolant by means of which the fibre-reinforced hollow product in the mould can be cooled.
5. The device according to claim 1 , wherein at least one of the inner mould and the outer mould includes a resin channel to supply resin to the mould cavity.
6. A method for manufacturing a fibre-reinforced hollow product, comprising:
injecting under an elevated pressure a resin into a mould having a mould cavity that is surrounded by a mould wall for abutment of the fibre-reinforced hollow product thereagainst in a closed condition of the mould, a rigid part of the mould wall being movable with respect to another part of the mould wall in the closed condition of the mould to ensure a continued abutment of the movable part of the mould wall with the fibre-reinforced hollow product when shrinkage of the resin caused by curing thereof takes place subsequent to the injection process
wherein the mould includes an inner mould to be positioned in a cavity of the fibre-reinforced hollow product and an outer mould to be positioned on an outer side of the product, and at least a rigid part of the inner mould is movable in the closed condition of the mould,
wherein a mould wall of the inner mould comprises rigid mould wall segments interconnected by a flexible material,
wherein the mold is provided with a pressure unit for pressing the movable part of the mould wall against the fibre-reinforced hollow product upon shrinkage of the resin,
wherein the pressure unit comprises a pressure chamber on a side of the movable part of the mould wall remote from the fibre-reinforced hollow product for pressing the movable part of the mould wall against the fibre-reinforced hollow product upon shrinkage of the resin under the influence of the pressure that prevails within the pressure chamber, and
wherein the pressure chamber at least substantially adjoins the entire circumference of the inner mould,
the resin being injected into an intermediate space being formed by the outer mould and the inner mould, the fiber-reinforced hollow product being manufactured in the intermediate space, and
curing the resin subsequent to the injection thereof, while the movable rigid part of the inner mould follows the movement of the fiber-reinforced hollow product upon shrinkage thereof.
7. The method according to claim 6 , wherein the fibre-reinforced hollow product consists of resin and fibres.