METHOD AND DEVICE FOR PRODUCING A COATED STRUCTURE
The present invention relates to a method and a device for producing a coated structure. A support structure is initially introduced into a mold, and subsequently a flooding gap is formed between the support structure and at least one part of the mold. Then, a negative pressure is generated in the flooding gap, and the flooding material is filled into the flooding gap. In order to avoid irregularities during the filling process, it is proposed to control or regulate the negative pressure in accordance with a predetermined pressure profile.
1 .- 11 . (canceled)
12 . A method, comprising the steps of:
forming a flooding gap between a support structure and a cavity wall in a closed molding tool;
generating a negative pressure in the flooding gap;
filling a flooding material into the flooding gap;
continuously controlling the negative pressure in the flooding gap in accordance with a predefined desired value specification to establish a flooding rate profile; and
executing the filling process by tracking the flooding rate profile.
13 . The method of claim 12 , further comprising the step of placing a support structure into the molding tool before the forming step, with the flooding gap being defined between the support structure and the molding tool.
14 . The method of claim 12 , further comprising the steps of executing an operation in at least one of two ways, a first way in which the negative pressure in the flooding gap is continuously determined, a second way in which a fill rate of the flooding material in the flooding gap is continuously determined.
15 . The method of claim 12 , further comprising the step of executing a compression molding step in the molding tool in combination with the controlling step.
16 . The method of claim 12 , wherein the controlling step is executed to keep the flooding rate substantially constant during the filling process.
17 . A device, comprising:
a molding tool with a bottom part and a top part, said bottom and top parts defining a cavity there between;
a filling device for filling a filling material in a flooding gap of the molding tool,
a sensor assembly continuously ascertaining a negative pressure in the flooding gap or a flooding rate; to output a corresponding signal;
a control unit storing predefined desired values commensurate with establishing a desired pressure profile in the flooding gap and comparing the output signal received from the sensor assembly with the desired values; and
a negative pressure device fluidly connected with the flooding gap and responsive to the control unit for generating a variable negative pressure in accordance with the desired pressure profile and to attain a predefined flooding rate profile.
18 . The device of claim 17 , wherein the molding tool has a cavity for producing a support structure, said molding tool being constructed to establish the flooding gap between the support structure and a wall of the cavity.
19 . The device of claim 17 , wherein the filling device is a mixing head for a polyurethane system.
20 . The device of claim 17 , wherein the negative pressure device is constructed to ascertain the negative pressure.
21 . The device of claim 17 , wherein the sensor assembly includes a sensor provided in an area of the flooding gap.