AIR ASSISTED PREPREG APPLICATION APPARATUS AND SYSTEM

Abstract

A prepreg application apparatus, comprising an air supply duct having a lumen configured to guide an air stream, a prepreg compacting body configured to set a position of a prepreg, the prepreg compacting body having a porous surface in fluid communication with the lumen of the air supply duct, and configured to release air of the air stream to an area ambient to the prepreg compacting body, and an air conveying device configured to control a power of the air stream ensuring that the air emanates from the prepreg compacting body at the porous surface when being on or close to the prepreg.

Claims

1. A prepreg application apparatus, comprising: an air supply duct having a lumen configured to guide an air stream; a prepreg compacting body configured to set a position of a prepreg, the prepreg compacting body having a porous surface in fluid communication with the lumen of the air supply duct, and configured to release air of the air stream to an area ambient to the prepreg compacting body; and an air conveying device configured to control a power of the air stream ensuring that air emanates from the prepreg compacting body at the porous surface when being on or close to the prepreg.

2. The prepreg application apparatus of claim 1, wherein the air supply duct at least partially forms a hollow axis, around which the prepreg compacting body is arranged.

3. The prepreg application apparatus of claim 1, wherein the prepreg compacting body comprises a core element, wherein the porous surface is provided at least on a portion of the core element.

4. The prepreg application apparatus of claim 3, wherein the core element is configured to move relative to the air supply duct.

5. The prepreg application apparatus of claim 1, wherein the porous surface has a substantially flat shape.

6. The prepreg application apparatus of claim 1, wherein the prepreg compacting body forms a roller, and wherein the porous surface is an exterior circumferential surface of the prepreg compacting body.

7. The prepreg application apparatus of claim 6, further comprising: at least one bearing supporting the prepreg compacting body and configured to allow a rotational movement of the prepreg compacting body relative to the air supply duct; or at least one air seal provided between the air supply duct and the prepreg compacting body, or both.

8. The prepreg application apparatus of claim 1, further comprising: a cover covering at least a portion of the prepreg compacting body and configured to at least partially block the air from emanating through the porous surface.

9. The prepreg application apparatus of claim 1, wherein the porous surface is made from a graphite material.

10. The prepreg application apparatus of claim 9, wherein the graphite material comprises pyrolytic graphite.

11. A prepreg application system, comprising: a mold configured to receive a prepreg thereon; and a prepreg application apparatus of claim 1, wherein the prepreg application apparatus is moved along the mold, so that the prepreg compacting body presses the prepreg towards the mold.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In the following, the present disclosure will further be described with reference to exemplary implementations illustrated in the figures, in which:

[0033] FIG. 1 schematically illustrates a perspective view of an exemplary prepreg application apparatus;

[0034] FIG. 2 schematically illustrates a cross-sectional view of the prepreg application apparatus of FIG. 1;

[0035] FIG. 3 schematically illustrates a perspective view of another exemplary prepreg application apparatus;

[0036] FIG. 4 schematically illustrates a cross-sectional view of the prepreg application apparatus of FIG. 3;

[0037] FIG. 5 schematically illustrates an exemplary prepreg application system;

[0038] FIG. 6 schematically illustrates another exemplary prepreg application system; and

[0039] FIG. 7 schematically illustrates yet another exemplary prepreg application system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the present disclosure. It will be apparent to one skilled in the art that the present disclosure may be practiced in other implementations that depart from these specific details.

[0041] FIGS. 1 and 2 schematically illustrate a perspective view and a cross-sectional view of an exemplary prepreg application apparatus 100, respectively. The apparatus 100 comprises an air supply duct 110 having a lumen 112 configured to guide an air stream 150. The air supply duct 110 can be made from a metallic or plastic material, and can form an axle of the prepreg application apparatus 100.

[0042] The prepreg application apparatus 100 further comprises a prepreg compacting body 120 configured to set or fix a position of the prepreg 200 with respect to a mold 250 (FIGS. 5 to 7) or even position the prepreg 200 on the mold 250. In the exemplary prepreg application apparatus 100 of FIGS. 1 and 2, the prepreg compacting body 120 forms a roller, such as a cylinder or drum. This round form facilitates rolling over the prepreg 200, while applying/placing the prepreg 200.

[0043] The prepreg compacting body 120 has a porous surface 122 that is in fluid communication with the lumen 112 of the air supply duct 110. As a mere example, the air supply duct 110 can have one or more through holes 114 through which air can leave the lumen 112. As illustrated in FIG. 2, the one or more through holes 114 are arranged in a region of the air supply duct 110, where the prepreg compacting body 120 is arranged, i.e., where the prepreg compacting body 120 surrounds the air supply duct 110. Thus, the air streaming from the lumen 112 through the through holes 114 will be inside of the prepreg compacting body 120, and particularly, inside of the porous material forming the porous surface 122.

[0044] In the exemplary prepreg application apparatus 100 of FIGS. 1 and 2, the porous surface 122 is an exterior circumferential surface of the prepreg compacting body 120. Thus, the porous surface 122 forms a wheel tread of the wheel-like or roller-like prepreg compacting body 120.

[0045] The prepreg application apparatus 100 further comprises an air conveying device 180, which is only schematically illustrated in FIG. 2. The air conveying device 180 is configured to convey air into the lumen 112 of the air supply duct 110. In other words, the air conveying device 180 generates an air stream 150 that is guided into the air supply duct 110, from where the air stream 150 can emanate through the through holes 114.

[0046] Furthermore, the air conveying device 180 can further be configured to control a power of the air stream 150. Specifically, the porous surface 122 of the prepreg compacting body 120 is configured to release air 156 of the air stream 150 (illustrated exemplarily for three through holes in FIG. 2) into an area ambient to the prepreg compacting body 120. In other words, the porous surface 122 allows air to be released to the outside of the body 120. The air conveying device 180 can control the power of the air stream 150 to ensure that the air 156 emanates from the prepreg compacting body 120 at the porous surface 122 being on or close to the prepreg 200. This will be explained in more detail with respect to FIGS. 5 to 7.

[0047] The porous surface 122 can be made by/from a graphite material, for example, a pyrolytic graphite, or a sintered metal or porous ceramic. Such materials have fine pores usually fluidly connected to one another, so that air 156 can stream through the porous material and can emanate at/from the porous surface 122.

[0048] Thus, the air conveying device 180 generates an air stream 150 introduced into the lumen 112 of the air supply duct 110. The air supply duct 110 can at least partially form a hollow axis around which the prepreg compacting body 120 can be arranged. The air 156 of the air stream 150 is released from the air supply duct 110 and can stream to the porous material of the prepreg compacting body 120, and can then emanate from the porous surface 122.

[0049] The prepreg application apparatus 100 can further comprise at least one bearing 132 supporting the prepreg compacting body 120 and allowing a rotational movement of the prepreg compacting body 120 relative to the air supply duct 110. As a mere example, FIG. 2 illustrates two bearings 132 arranged at/on the air supply duct 110. Each bearing 132 can, for example, be a ball bearing, rolling bearing or the like facilitating a relative movement of the prepreg compacting body 120 around the air supply duct 110. The present disclosure is not restricted to the illustrated number of bearings 132, but less or more than two bearings 132 can be employed.

[0050] In order to avoid air to be released from the interior space or area of the prepreg compacting body 120 at the ends of the body 120, at least one air seal 130 can be provided between the air supply duct 110 and the prepreg compacting body 120. As a mere example, as illustrated by a darker grey color, a space can be provided between the exterior of the air supply duct 110 and the interior of the prepreg compacting body 120, which is filled with air from the air stream 150. This space or gap can be closed at the respective ends of the prepreg compacting body 120 by respective seals 130. It is to be understood that in the areas of the bearings 132, such space or gap can be interrupted by the bearing 132.

[0051] In the exemplary prepreg application apparatus 100 of FIGS. 1 and 2, the prepreg compacting body 120 can be entirely made from the porous material forming the porous surface 122.

[0052] In another exemplary prepreg application apparatus 100 illustrated in FIGS. 3 and 4, the amount of porous material may be reduced. In this variant, the prepreg compacting body comprises a core element 140, and the porous material 121 forming the porous surface 122 is provided on the core element 140, such as surrounding the core element 140 circumferentially.

[0053] FIGS. 3 and 4 schematically illustrate a perspective and a cross-sectional view of this exemplary prepreg application apparatus 100, where components and elements of the apparatus 100 being identically or at least functionally the same to those of the exemplary apparatus 100 of FIGS. 1 and 2 are provided with the same reference numerals. While reference numeral 120 in FIGS. 1 and 2 refer to the prepreg compacting body as well as the porous material (since the body 120 (almost) entirely consists of the porous material), in FIGS. 3 and 4 the porous material is referred to as 121 to distinguish it from the core element 140. In order to avoid repetitions, a redundant description of the same elements and components as in FIGS. 1 and 2 has been omitted.

[0054] As can be derived from FIG. 4, the through holes 114 in the air supply duct 110 release air from the air stream 150 towards the core element 140. There can be a gap between the core element 140 and the air supply duct 110 facilitating distribution of the air. The core element 140 itself can comprise a porous material and/or through holes (also referred to as through holes 114 in FIG. 4) to guide the air of the air stream 150 to the porous material 121.

[0055] Thus, air 156 of the air stream 150 can be guided through the air supply duct 110, stream through the core element 140 and through the porous material 121, in order to emanate at the porous surface 122.

[0056] Furthermore, FIG. 5 schematically illustrates an exemplary prepreg application system. For instance, the prepreg application system can comprise a mold 250, which is only exemplarily illustrated as a flat form or tool, but can have any shape required for forming the composite structure made from the prepreg(s).

[0057] Furthermore, the prepreg application system can comprise a prepreg application apparatus 100, such as the apparatus 100 of either FIGS. 1 and 2 or FIGS. 3 and 4. The prepreg application apparatus 100 is moved along the mold 250, so that the prepreg compacting body 120 of the apparatus 100 applies and further presses the prepreg 200 towards the mold 250. As illustrated in FIG. 5, the prepreg application apparatus 100 moves from the right to the left and applies the prepreg 200 to the mold 250. By applying a pressure onto the prepreg 200, any air can be removed from the prepreg 200 and a snuggly fit of the prepreg 200 of the mold 250 can be achieved. Likewise, one or more subsequent layers of prepreg(s) can be applied onto an already laid out prepreg 200 in the same manner. FIG. 5 does not illustrated how the prepreg 200 is provided to the system, as this does not form part of the present disclosure. Any given technique to provide the prepreg 200 to the system can be employed.

[0058] As can be derived from FIG. 5, the air from the air stream 150 (provided through the lumen 112) flows through the porous material 120/121. This flow of air is referred to as 152 in FIG. 5. In other words, air 152 is from the air stream 150 and distributes throughout the interior of the prepreg compacting body 120. At the porous surface 122, the air 152 emanates from the porous surface 122. In the area, where the porous surface 122 is close to or on the prepreg 200, an air cushion 154 builds up, as the air cannot emanate in the same manner as in the area, where no prepreg 200 obstructs the porous surface 122. Specifically, the air conveying device 180 can control a power of the air stream 150, for example, a volume flow and/or mass flow of the air stream 150, so that the air inside the prepreg compacting body 120 is pressurized and the emanating air 156 can form the pressurized air cushion 154.

[0059] FIG. 6 schematically illustrates another exemplary prepreg application system. This prepreg application system corresponds to that of FIG. 5, so that the description of identically or functionally same features will be omitted. These features are provided with the same reference numerals.

[0060] Specifically, in the system of FIG. 6, the prepreg application apparatus 100 comprises a cover 160 covering at least a portion of the prepreg compacting body 120. The cover 160 may be provided in a fixed manner relative to the air supply duct 110. In the exemplary system of FIG. 6 (as well as FIG. 5) the prepreg compacting body 120 can rotate around the air supply duct 110, and, hence, can move relative to the cover 160. In other words, the prepreg compacting body 120 can rotate in a cavity or recess formed by the cover 160.

[0061] By covering the prepreg compacting body 120 and, hence, a portion of the porous surface 122, the cover 160 is further configured to at least partially block the air 156 from emanating from/through the porous surface 122. This increases the amount of air forming the air cushion 154, which facilitates building the air cushion 154 and further reduces the amount of air 150/152 to be conveyed by conveying device 180.

[0062] FIG. 7 schematically illustrates yet another exemplary prepreg application system. This prepreg application system includes elements and components identical to or functionally the same to that of FIGS. 5 and 6, so that the description of such identical or functionally same features will be omitted. These features are provided with the same reference numerals throughout all drawings.

[0063] In the exemplary system of FIG. 7, the prepreg compacting body 120 or at least the porous surface 122 (or a section thereof) has a substantially flat shape. As can be derived from FIG. 7, the flat surface at the bottom of the prepreg compacting body 120 can be (substantially) flat. This is possible due to the air cushion 154 formed between the body 120 and the prepreg 200 and significantly reducing adhesion and friction. Such flat surface 122 facilitates flattening the prepreg 200 while applying it to the mold 250. Thus, the prepreg compacting body 120 functions like an iron for textiles.

[0064] Since such flat prepreg compacting body 120 does not need to rotate, the porous material forming the porous surface 122 can be applied only in one or more regions of the body 120, which apply the prepreg 200 to the mold 250. For instance, the porous surface 122 can be provided at the flat (bottom) region of the body 120. This not only reduces the amount of porous material required for the prepreg application apparatus 100, but further allows omitting a specific cover 160 (cf. FIG. 6). Instead, the upper region of the prepreg compacting body 120 can be made from an airtight material, so that the air stream 150 from the air supply duct 110 is guided solely to the flat (bottom) region of the body 120 and the porous surface 122.

[0065] It is to be understood, that a front section (to the left in FIG. 7) may have a round shape and may also be provided with a porous surface 122. In other words, the prepreg compacting body 120 can be made specifically for applying the prepreg 200, i.e., a porous surface 122 is only applied in regions of the body 120, where the body 120 will be close to or comment or contact with the prepreg 200.

[0066] Since one (upper) region of the prepreg compacting body 120 is different from another (bottom) region, such prepreg application apparatus 100 can include a core element 140, which is equipped with through holes 114 only in the region where the porous material forming the porous surface 122 is provided. Thus, a very simple prepreg application apparatus 100 can be formed.

[0067] It is believed that the advantages of the technique presented herein will be fully understood from the foregoing description, and it will be apparent that various changes may be made in the form, constructions and arrangement of the exemplary aspects thereof without departing from the scope of the disclosure or without sacrificing all of its advantageous effects. Because the technique presented herein can be varied in many ways, it will be recognized that the disclosure should be limited only by the scope of the claims that follow.

[0068] While at least one exemplary embodiment of the present invention(s) is disclosed herein, it should be understood that modifications, substitutions and alternatives may be apparent to one of ordinary skill in the art and can be made without departing from the scope of this disclosure. This disclosure is intended to cover any adaptations or variations of the exemplary embodiment(s). In addition, in this disclosure, the terms comprise or comprising do not exclude other elements or steps, the terms a or one do not exclude a plural number, and the term or means either or both. Furthermore, characteristics or steps which have been described may also be used in combination with other characteristics or steps and in any order unless the disclosure or context suggests otherwise. This disclosure hereby incorporates by reference the complete disclosure of any patent or application from which it claims benefit or priority.