DE10024754C2 - Device for impregnating plastic fabric wound on a roll - Google Patents

Description

The invention relates to a device for soaking on a Roll of wound plastic fabric.

For the manufacture of boats or rotor blades from wind turbines glass fiber reinforced plastic (GRP) are the ones required for production Glass fiber fabrics and fabrics usually on rolls from the GRP manufacturer delivered.

If necessary, the glass fiber mats are then cut and machined or soaked manually with resin (e.g. epoxy or polyester). For this, the GFK Material unwound from the roll and on laminating foils on a so-called Spread out laminating table. A resin nozzle moves during mechanical impregnation evenly over the unwound plastic mats and applies the resin. at The manual impregnation is carried out by a trained person (per Hand).

This is a time consuming and expensive process because the mats then come back rolled up, for example, to be transported to the rotor blade shape, where they are then unrolled again and the mats are inserted into the mold.  

WO 99/33623 A1 describes a method and a device for fiber impregnation disclosed. Here, fiber bundles, fiber strands, fabrics or fiber mats, in which an impregnating agent in the interstices of the fiber material is introduced, soaked, the supply of the impregnating agent over Openings are made in a feed body over which the fiber material is moved away, the device being a feed body with openings for the Has supply of an impregnating agent.

DE 35 37 755 C2 describes an application roller for paints made of porous and solvent resistant foam cylinders with holes or slots for color penetration known to the outside with a pile cover.

The object of the invention is to avoid the aforementioned disadvantages and one simpler and significantly cheaper impregnation of the glass fiber reinforced Allow plastic.

The object is achieved by means of a device with the feature according to claim 1 and solved by a method according to claim 5. Advantageous further training conditions are described in the subclaims.

According to the invention, the impregnation of the glass fiber reinforced Plastic already on the roll. There is a corresponding one Device provided with which the two end faces of the roller are sealed and which allows a controlled impregnation of the roll with resin (from the inside out). Here, the roll core has a chamber with a radial opening, so that due to gravity and / or pressure the resin the plastic fabric can enforce what happens especially even when the role during the impregnation is rotated or swiveled accordingly.

With the invention it is achieved that the rotor blade production with pre-impregnated rollers can be supplied and there are always sufficiently long tracks with constant Width are available.  

With the impregnation according to the invention it is possible to determine the resin content of the fabric (within a certain tolerance range) to define the Impregnation itself requires a very short processing time and the cost of that Impregnation per role is very low and beyond that there is only one very little waste of resin fabric or film.

The invention is based on an embodiment in the drawing explained in more detail.  

Fig. 1 shows a plastic fabric roll 1 , which surrounds a core 2 . This core 2 is hollow on the inside and has a plurality of radial openings (not shown).

Furthermore, seals 3 and 4 are formed on the end of the roll, which are pressed onto the end faces of the fabric roll by means of a tie rod device 5 .

Furthermore, a feed line 6 is formed in the hollow core interior. The feed line is connected to a filling device 7 , by means of which the impregnating resin can flow into the hollow chamber of the core 2 . The filling device preferably has a pump, by means of which the resin is pressed into the chamber interior at a predetermined pressure.

The entire device is pivotally or rotatably suspended (not shown), which can be done by means of a carriage, the outside is attached and to which the swivel device (not shown) engage can.

If the resin is pressed into the interior of the chamber, it can only pass through this core leave radial openings of the core. From there, the Harz gradually penetrates according to the respective fabric roll layers until excess resin comes out of the outside Role exits.

This can be collected in a collecting device and the resin conveyor device are fed again until the entire fabric roll is soaked.

Various swivel devices are of course conceivable. these can for example, consist of an electric motor with two ball bearings, through which the Roll (with internal resin feed) is rotated.

The core of the role preferably consists of a metal cylinder in the  Holes are embedded. The core can also consist of a cardboard tube.

The amount of resin collected can also be measured (e.g. by Weight / volume measurement) and as soon as a certain amount of resin leaked , the impregnation process is ended because of the amount of excess resin the completeness of the impregnation can be concluded.

Because the impregnation is mainly due to the gravity of the resin , it is important to ensure that the role is preferably several complete Can make swings so that resin on all parts of the roller layers can reach.

By means of the device according to the invention, the previous impregnation of Fabric rolls are replaced so that the mold and shell construction with full impregnated rolls can be supplied (long webs, constant width). in this connection a very precise resin content (within narrow tolerance) can be set, which Processing time is very short and the cost per roll is low and it poses there is even a small drop in resin, fabric and film.

If the fabric rolls by means of the device according to the invention with resin injected, the protective film is perforated around the tissue, so that the Injection of excess resin leaking easily from the tissue surface (e.g. by stripping) can be removed.

Instead of a single tie rod (conveniently located centrally) also several tie rods, for example four tie rods distributed over the circumference, be provided. These outer tie rods can especially warp the Prevent seals. The seals themselves can be made of wood or metal or Plastic plates (rings) exist, on the inside of which one or two or several layers of foam rubber can be put.  

The resin is fed through the hose with the hose pump through a hose pressed. The resin fills the gap between the core and is covered by the Holes pressed out through the fabric. Here it can also be advantageous to arrange the impregnation device within a vacuum, so that then the resin is conveyed by vacuum. The resin coming out is collected and injected back into the circulation.

Below are several examples of how to perform an inventive one Procedure described.

example 1

A roller G1 + G2 with the following dimensions was used for the first injection attempt:
Manufacturer: Ahlstrom
Weight: 15 kg
Width: 150 mm
Laminating resin L 135 / H137 was used at 20 ° C temperature.
The roll was placed in a container under vacuum (approx. 1 bar) and resin was injected through the core.
The injection lasted approx. 20 min., The roll was completely soaked.
The resin content (outside): 37.2%.
Due to gravity, the resin content in the lower part of the roll is higher than in the upper part of the roll.
Drill core = Ø 33 mm, height = 45 mm
Resin content above: 33%
Resin content below: 35%

Example 2

After that, the roll was only injected under pressure. After the injection, the roll was rolled out so that the resin content in the inner and outer area of the roll can be adjusted.
Resin content (outside): 38%; 33%
Resin content (inside): 33%; 31%
Injection time: 30 min.
Pump position: medium

Example 3

Roll G1 + G2 + G2 injected (width 150 mm)
Manufacturer: Kümpers
Weight: 15 kg
Resin content (outside): 32%
Resin content (inside): 28%
Injection time: 30 min.
Pump position: medium

Example 4

Roll G1 + G2 + G2 injected (width 150 mm)
Manufacturer: Saertex
Weight: 15 kg
Resin content (outside): 36%
Resin content (inside): 31%
Injection time: 20 min.
Pump position: medium-full

Example 5

Roll G1 + G2 + G2 injected (width 500 mm)
Manufacturer: Saertex
Weight: 30 kg
Resin content (outside): 33%
Resin content (inside): 34%
Injection time: 20 min.
Pump position: medium-full

Example 6

Roll G1 + G2 + G2 injected (width 1270 mm)
Manufacturer: Saertex
Weight: 75 kg
Resin content (outside): 42% (influence of winding tension)
Resin content (inside): 30%
Injection time: 20 min.
Pump position: full
Comment:
Roll rotated after 15 min.
Roll with perforated sheet core

As can be seen from the individual implementation examples described above, the time taken to impregnate a roll to a range of 30 minutes or be held less. This is a significantly shorter time and also with considerably less effort than with the previous impregnation technology, where the rolls are first unwound, then soaked and then be wound up again.  

In summary it can be stated that by means of the Impregnation process generates a small amount of waste. It is u. a. also none Laminating film needed. The entire device consists of simple and therefore less complicated individual elements, such as a resin pump, a watering station as well as clamping and sealing elements.

Of course, instead of perforating the core, a core can also be used Longitudinal grooves are used.

To increase the resin content, the roller is preferably loosened relatively loosely kelt, so that a sufficiently large space between the layers of resin can be filled out.

Depending on the different sewing technique of the fabric, this is sometimes one or the other other example above rather advantageous. Especially with the roles make sure that the seams of layers lying on top of each other are not parallel, but rather crossed.

Fig. 2 shows a front view of the device according to the invention for impregnating a roll with plastic fabric. Here, in the manner of a slide, which at least partially surrounds the outside of the roller, a swivel drive is attached, which swivels the entire roller to a certain angle.

The resin (impregnating liquid) escaping from the outside of the roll gets into one Collection and can be fed from there to the resin cycle. This can also the amount collected is measured, which is a measure of the degree of impregnation of the Role is.

The resin reaches the interior of the roll from a resin reservoir via a pump - as already described in FIG. 1.

Claims (5)

1. Device for impregnating plastic wound on a roll fabric, preferably glass fiber, with resin, the roll having a central chamber has at least one radial opening, wherein means are formed, the roller to seal on both faces and with a resin supply to the chamber is provided. 2. Device according to claim 1, characterized in that the device has at least one tie rod, by means of which a seal is pressed onto each end face. 3. Device according to claim 1 or 2, characterized in that the chamber is formed by a cylinder which is surrounded by the roll material. 4. Device according to one of the preceding claims, characterized in that the device for pivoting or Rotating this role or the entire device has. 5. Method for impregnating glass fiber reinforcement fabric with resin a device according to any one of the preceding claims, wherein after the recording the roll with wound glass fiber fabric in the device the end faces of the Be sealed and resin in the chamber under gravity and / or Pressure is filled, which is the openings of the chamber and the individual layers passes through the roll until excess resin emerges from the outside of the roll.