WO2008019741A1

WO2008019741A1 - Granulated rod-shaped long fibre material

Info

Publication number: WO2008019741A1
Application number: PCT/EP2007/006312
Authority: WO
Inventors: Richard Brüssel
Original assignee: Blach Verwaltungs Gmbh & Co. Kg
Priority date: 2006-08-18
Filing date: 2007-07-17
Publication date: 2008-02-21
Also published as: DE102006038948A1

Abstract

The invention is based on a granulated rod-shaped long fibre material formed from fibre material (14) impregnated with plastic (12). It is proposed that at least 10% of fibres (16) of the fibre material (14) are shorter than a length (18) of the granulated rod-shaped long fibre material.

Description

Langfaserstabchengranulat

State of the art

The invention is based on a long-fiber rod granulate according to the preamble of claim 1. The invention is further based on a process for the production of long-fiber rod granules according to the preamble of claim 5.

Long fiber bar granules are already known which are formed from a fiber-impregnated fiber material. The fibers of an endless fiber strand are wetted by a polymeric plastic and / or coated.

The invention is in particular the object of providing a Langfaserstabchengranulat, which is produced with a low cost and / or energy consumption. It is achieved according to the invention by the features of claim 1. Further embodiments will be apparent from the additional and dependent claims. Advantages of the invention

The invention relates to a Langfaserstabchengranulat from a plastic impregnated Fasermateπal.

It is suggested that at least 10% fibers of the fiber material are shorter than long fiber rod granules. Due to a shorter fiber length than the long fiber rod granulate length, the long fiber rod granules can be produced with a low cost and / or energy expenditure. The plastic is preferably formed by a polymeric plastic. The content of fibers in the long fiber bar granules that are shorter than the long fiber bar granules is preferably at least 10%. The fiber material is preferably formed from a fiberglass material, a carbon fiber material, a natural fiber material and / or another fiber material that appears expedient to the person skilled in the art.

Furthermore, it is proposed that the long fiber bar granulate length be between 3 mm and 30 mm, whereby the long fiber bar granules can advantageously be further processed. Furthermore, a large fiber length connected thereto can be achieved by the large long fiber rod granulate length and thus an advantageous strength of a component produced from the long fiber rod granules can be achieved.

Advantageously, a mean fiber length of the fiber material amounts to between 1 mm and 20 mm, whereby a wear of fiber material in the production and in particular in the Further processing of Langfaserstabchengranulats can be at least reduced. The average fiber length can be limited within the long fiber bar granules to an effective fiber length for further processing.

Furthermore, it is advantageous if a Fasermateπalkonzentra- tion between 10% and 80%, whereby Langfaserstabchengululat can be generated, which can be used for different types of further processing or for different components produced from the Langfaserstabchengranulat components.

In a further embodiment of the invention, a method is proposed, which is provided for the production of long-fiber rod granules, which is formed from a fiber-impregnated fiber material, wherein short fibers of the fiber material are used for the production of Langfaserstabchengranulats. In this way, a particularly cost-effective method for producing the long-fiber rod granules can be achieved by, in particular, fiber residues can be processed. In this context, "short fibers" are to be understood as referring in particular to fibers which have a finite length and in particular less than 2 m (meters) Preferably, a length of the fibers is limited to a maximum of one double of a long fiber rod granule length, advantageously it is maximum however, it is limited to a fraction of the final long fiber bar granules length, but individual fibers of the fiber material for making the long fiber bar granules may also be - A -

SAK 1877 WO

have a multiple of the final long fiber bar granule length.

It is also proposed that the short fibers of the fiber material be impregnated with plastic, which structurally simple a short fiber length, in particular a shorter fiber length than a final Langfaserstabchengranulatlange can be achieved. The proportion of fibers in the long fiber rod granules which are shorter than the long fiber rod granules is preferably at least 10%, advantageously at least 25%, and preferably at least 40%.

In addition, it is proposed that endless fibers of the fiber material be used for producing the long fiber rod granules, whereby an advantageous supply of the fiber material can be achieved.

Furthermore, it may be advantageous if the fibers of the fiber material are shortened during an impregnation process and / or after an impregnation process. Endless fibers can also be used with particular advantage as fiber material for producing the long fiber rod granules, in which ultimately at least 10% of the fibers of the fiber material are shorter than a long fiber rod granulate length. The fibers can be broken here on special mixing elements and / or cutting elements.

It is further proposed that the fiber-impregnated fiber material be cut to a long fiber rod granule length, thereby providing a uniform distribution of fiber material within the long fiber rod granule. can be targeted. By "cut" in this context is meant a separation from a coherent object, such as a polymer material impregnated with a polymeric material, such as, in particular, breaking, knocking, cutting, etc.

A particularly low level of wear during the production of the long fiber bar granules can advantageously be achieved when a long fiber bar granulate mass is cut in a hot cut. It should under a "hot discount" a

A method can be understood in which a Langfaserstabchengranulatmasse is cut in a hot state in long fiber rod. Preferably, the Langfaserstabchengra ^¬ nulatmasse is heated for impregnation to a melting temperature of the polymeric resin, so that also a vorteilhaf ^¬ te energy saving can be achieved.

In addition, that a Langfaserstabchengranu ^¬ latmasse is cut in the cold cut is proposed. The term "cold cut" is to be understood as meaning a process in which a long fiber bar granulate mass is cut into long fiber bar stock in a cooled state.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the Invention shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine these into meaningful further combinations.

Show it:

Fig. 1 is a schematic sectional view of an apparatus for a method according to the invention for the production of a Langfaserstabchengranulats invention and

FIG. 2 shows a long fiber rod of the long fiber rod granulate from FIG. 1.

Description of the exemplary embodiment

FIG. 1 shows a device 22 for a method for the production of long fiber bar granules 10. The apparatus 22 includes an extruder unit 24 and a cutting unit 26. The extruder unit 24 includes a Schne ^¬ ckenwelle 28 which is arranged inside a screw cylinder 30th The worm shaft 28 is driven by a drive shaft 32 from a drive unit not shown in detail.

The worm cylinder 30 is rohrformig and has an opening 34 on one of the drive shaft 32 side facing. Through this opening 34 polymer plastic 12 is introduced into the screw cylinder 30. At one of the tendons Ckenwelle 28 opposite side of the opening 34, a funnel-like receptacle 36 is arranged, which receives the polymeric plastic 12 before it is inserted into the screw cylinder 30. The polymeric plastic 12 is supplied to the screw cylinder 30 in the form of a solid plastic granules. The supply of the polymer plastic granules takes place via a not shown gravimetric dosing, in which by a determination of a weight of the polymer plastic granules a required amount per period of the extruder unit 24 is supplied.

Along the worm cylinder 30 heating elements 40 are arranged in a transport direction 38 on an outwardly directed side of the worm cylinder 30, which heat the polymer plastic granules. In this case, the polymer plastic granules are heated to a temperature which is higher than a melting temperature of the polymer plastic granules, so that the polymeric plastic granules are melted during transport inside the screw cylinder 30.

Along the transport direction 38, the screw cylinder 30 has a further opening 42 for a supply of fibers 16 of a fiber material 14. In the region of the opening 42 of the screw cylinder 30, which is provided for the supply of Fasermateπ- than 14, the polymeric plastic is already completely melted.

The feeding of the fibers 16 of the fiber material 14 takes place via a side dosing 58, which encloses a worm shaft 60. The worm shaft 60 transports the fibers 16 of the fiber material 14 to the opening 42 of the worm cylinder 30. A fed amount of fibers 16 of the fiber material 14 is carried out gravimetrically, so that a fiber material concentration can be varied in the Langfaserstabchengranulat 10, wherein the fiber concentration in a range between see see 10% and 80%. The fiber material is already shortened to a finite length of the individual fibers 16 before being fed into the screw cylinder 30. In principle, however, it is also conceivable to use fibers 16 of an endless fiber strand for producing the long fiber rod granules 10. For this purpose, the fiber strands are fed through the opening 42 in the worm cylinder 30 by wrapping around the worm shaft 28 to the molten polymeric plastic 12 within the worm cylinder 30. For this purpose, advantageously a twin-screw extruder not shown in more detail is used.

Inside the worm cylinder 30, the fibers 16 of the fiber material are impregnated with the polymer plastic 12 or a long fiber bar granulate mass 44 having a homogeneous fiber concentration is produced. For this purpose, the fibers 16 of the fiber material 14 and the polymeric plastic 12 are further transported by the worm shaft 28 in a transport direction 38 of the worm shaft 28 and mixed together by the worm shaft 28. To a cooling of the molten polymeric plastic 12 together with the

Furthermore, heating elements 40 are arranged along the screw cylinder 30 on the outwardly directed side of the screw cylinder 30, which keep the polymer plastic 12 together with the fiber material at a temperature which is above the melting temperature of the polymer plastic 12. Along the transport direction 38 is disposed after the opening 42 for introducing the fibers 16, a unit 46 which is provided for breaking the fibers 16, in particular of endless and / or very long fibers 16 of the fiber material 14.

In the transport direction 38 of the worm shaft 28, after the worm shaft 28, the long fiber rod granulate mass 44 is pressed through a nozzle 48. In the transport direction 38, after the nozzle 48, a multi-hole panel 50 connects, through which the long fiber rod granulate mass 44 is pressed during operation of the apparatus 22. The cutting unit 26 adjoining the multi-hole panel 50 cuts the long fiber rod granule mass 44 to a long fiber rod granule length 18.

The long fiber rod granules 10 are cut in a hot punching process. For this purpose, 50 heating elements 52 are arranged in the transport direction 44 along the multi-hole aperture, which prevent cooling of the long fiber rod granules 44 to a temperature below the melting temperature of the polymer plastic 12. The tough long fiber rods granular mass 44 is pressed through the multi-aperture plate 50 and cut by a cutting means 54 of the cutting unit 26 to a Langfa ^¬ serstäbchengranulat 10th The cutting means 54 thereby moves in rotation about an axis 56 on the multi-aperture 50.

In principle, however, it is also possible to cut the long fiber rod granulate mass 44 in a cold cut method. For this purpose, in the device 22 from FIG. 1, the heating elements 52 along the multi-hole diaphragm 50 or a use of the heating elements 52 can be dispensed with. The long fiber stabchengranulatmasse 44 has in the range of the multi-aperture plate 50 has a temperature which is below the Schmelztem ^¬ temperature of the polymeric resin 12, so that the long faserstabchengranulatmasse 44 is pressed in an already cooled and solidified state by the multi-aperture plate 50 and then by the cutting means 54 is cut to a long fiber rod granule length 18.

The cutting unit 26 cuts the long fiber bar granular mass 44 onto a long fiber bar granule length 18 that is between 3 mm (mm) and 30 mm. The long fiber rod granules 10 (FIG. 2) have a fiber length 20 that is at least 10% shorter than the long fiber rod granules 18 due to the short fibers 16 of the fiber material used in making the long fiber rod granules 10. The average fiber length 20 in the long fiber rod granules 10 due to the amounts Langfaserstabchengranu ^¬ latlange 18 between 1 mm and 20 mm.

13. 07. 07

Be zugs sign

10 Long fiber bar granules 50 Multi-perforated plate lat 52 heating element

12 plastic 54 cutting agents

14 fiber material 56 axis

16 fiber 58 side dosing

18 Langfaserstabchengranu- 60 worm shaft latlange

20 fiber length

22 device

24 extruder unit

26 cutting unit

28 worm shaft

30 screw cylinders

32 drive shaft

34 opening

36 receptacles

38 Transportπchtung

40 heating element

42 opening

44 Long fiber bar granulated material

46 unit

48 nozzle

Claims

13.07.07Ansprüche

1. long fiber bar granules, which is formed from a plastic (12) impregnated fiber material (14), characterized in that at least 10% fibers (16) of the Fasermateπals (14) are shorter than a Langfaserstabchengranulatlange (18).

2. Langfaserstabchengranulat according to claim 1, characterized in that the Langfaserstabchengranulatlange (18) amounts to between 3 mm and 30 mm.

3. Langfaserstabchengranulat according to claim 1 or 2, characterized in that a mean fiber length (20) of the fiber material (14) amounts to between 1 mm and 20 mm.

4. Langfaserstabchengranulat according to any one of the preceding claims, characterized in that a fiber material concentration is between 10% and 80%.

5. A process for the production of long fiber bar granules, which is formed from a plastic (12) impregnated fiber material (14), according to one of the preceding claims, characterized in that short fibers (16) of the fiber material (14) are used for the production of Langfaserstabchengranulats ,

6. The method according to claim 5, characterized in that the short fibers (16) of the fiber material (14) are impregnated with plastic (12).

7. A method at least according to claim 5, characterized in that endless fibers (16) of the fiber material (14) are used for the production of long fiber rod granules.

8. The method according to any one of claims 5 to 7, characterized in that the fibers (16) of the fiber material (14) are shortened during a Impragniervorgangs and / or after a Impragniervorgang.

9. The method according to any one of claims 5 to 8, characterized in that the plastic (12) impregnated fiber material (14) is cut on a Langfaserstabchengranulatlange (18).

10. The method at least according to claim 9, characterized in that a Langfaserstäbchengranulatmasse (44) is cut in the hot tee.

11. The method at least according to claim 9, characterized in that a Langfaserstäbchengranulatmasse (44) is cut in the cold cut.