A method of manufacturing a compound from a fluid synthetic material and solid fibrous filler by extrusion process and a device for implementing the method

 

The invention relates to a method of manufacturing a compound from a fluid synthetic material and solid fibrous filler of the reinforcing material, in particular glass fiber, as well as to a device for implementing the method. The method involves the extrusion of these materials from the extrusion cavity to the outside. Endless fiber reinforcing material is pre-moistened with a synthetic material, down in the extrusion cavity synthetic material and mix with them in this cavity. For wetting synthetic material endless fibers are fed through the gap formed between the two driven in rotation in opposite directions of the wetting rollers. The outer surface of the roll has a coating of fluid synthetic material with a thickness sufficient to permanently fill the gap between the rolls of synthetic material. A device for implementing the method comprises a screw extruder and a wetting device for the supplied fiber material. Extrusion cavity of the extruder, surrounded by housing, in addition to the input and output holes for extrudable synthetic material has a lateral overstate connected to a side opening of the extruder. The invention provides uniform and complete wetting of the fibrous material and the manufacture of compound with a high content of very long fibers. 2 C. and 15 C.p. f-crystals, 1 Il.

The invention relates to a method of manufacturing a compound from a fluid synthetic material and solid fibrous filler according restrictive part p. 1 claims, as well as to a device for implementing this method.

From DE 19530020 A1 is known a method of manufacturing a compound of synthetic material and solid fibrous filler using a heated screw extruder, which automatically retract endless fibers that are cut and mixed with synthetic material, with the result that appears ready fibrous compound. The length of the section in the extruder is required for intensive mixing of fluid synthetic material, as small as possible, endless fiber before entering the extruder moisten the specified synthetic material in the impregnating device.

Impregnating device is described, for example, in EP 0287427 B1. This device for moistening an endless fibrous material which region of this channel over two of the flow channel for supplying a fluid synthetic material to an endless fibrous material. In the longitudinal direction of the channel is not straightforward, and several times bent up and down, so fibrous material during its passage every time deviates from the respective edges. Thanks this should be the most uniform and complete wetting of the fibrous material.

In the US 5110275 described extruder for the manufacture of the compound of synthetic fluid and particulate fibrous filler of the reinforcing material, in particular glass fiber by extrusion of synthetic material of the extrusion cavity to the outside. Endless fiber reinforcing material, before it is already soaked with synthetic material, are supplied into the extrusion cavity synthetic material and mixed with it in this cavity.

The objective of the invention is to improve known methods so as to ensure uniform and complete wetting of the fibrous material as simple as possible. The method should allow to produce a compound with a particularly high content of very long fibers to ensure high resistance to fracture produced from this compound parts. The invention also AVL the problem is solved with the help of signs, listed in paragraph 1 of the claims. The device for carrying out the method is characterized by the features indicated in paragraph 8 of the claims. Expedient refinements of the invention are described in dependent claims.

According to the invention, the manufacture of the compound from flowing thermoplastic synthetic material and solid fibrous filler of the reinforcing material is carried out by extrusion of the materials used from the extrusion cavity to the outside. As fluid synthetic material can also be used mainly liquid thermosetting synthetic materials such as polyester resin. Preferably still, the use of thermoplastic synthetic material, for example polyethylene or polypropylene, which are softened in the extrusion cavity while applying heat. As a fibrous material for reinforcing is used as the matrix fluid synthetic material, you can use any materials. It is preferable to use fiberglass. The fibrous reinforcing material in the form of endless fibers down to being in the extrusion cavity already in fluid synthetic material is iCustom fluid synthetic material, in comparison with the quantity of this material in the extruder. Due to this pre-wetting time of mixing in the extruder necessary to achieve the most uniform distribution of fibers in the matrix material, can be minimized. Therefore supplied fiber, which when exposed to the mixing tools have a tendency to break or crack, can store a relatively large length. The longer and more intense is the mixing, the shorter becomes the individual fibers. To ensure that the products manufactured according to the invention compound had the highest fracture resistance, it is important that the fibers remained longer. Without sufficient wetting supplied endless fibers mixing must be considerably longer.

To achieve complete wetting of endless fibers fluid synthetic material, these fibers according to the invention, is fed through a gap formed between two of the wetting rollers driven in rotation in opposite directions. The outer surface of the wetting roll has a coating of synthetic material matrix in the m material. Thanks to the endless supply of fibers through the gap between the rollers, these fibers are forcibly introduced into an extremely intense contact with fluid synthetic material, and therefore very inexpensive way their surface is completely wetted with synthetic material. The output of the wetting device in the conveying direction is combined with a side opening of the extruder.

In principle, fluid synthetic material to cover the wetting rolls can be obtained from a separate extruder and to submit to the outer surface of the wetting rolls. However, particularly advantageous to allocate the required fluid synthetic material in the form of a separate stream from the extrusion cavity intended for mixing with endless fibers, where the synthetic material is already in running state, but not yet mixed with the fibers.

For the manufacture of the compound are particularly suitable mnogochasovye extruders, preferably twin-screw extruders, due to its good properties in respect to mixing. In principle, it is possible to use single-screw extruders. It is advisable to apply moistened endless fibers in the zone of mixing of such extruder. For quite what I achieve a particularly good wetting of endless fibers, it is recommended to bring the wetting rollers in rotation with different relative to each other, cutting speeds. In this way the gap between the rollers creates friction, which leads to Raspletina fibrous material. Due to this, a separate fiber feed beam can be injected into the gap between the rollers in a particularly intensive contact with fluid synthetic material and completely covered. By untwisting it is possible to separate the fibers, if they are glued to each other in the "coverage", and to achieve wetting "of the individual fibers". Different values of the peripheral speed of the rolls can be obtained, for example, at equal values of the speed by selecting the respectively different diameters of the rolls. However, it is preferable to set different values for the peripheral speed of the rolls by proper installation and adjustment of different values of the number of revolutions of the wetting rolls.

In order to ensure the orderly flow of endless fibres to the wetting rolls are encouraged to submit endless fiber first couple obkatyvalisj each other retractable rolls, and then in the gap between the wetting rollers. Retractable rollers rotate, as well as wetting rollers, the NII.

The device according to the invention for implementing the above method comprises as a main element, a screw extruder, extrusion cavity which is surrounded by the housing of the extruder, in addition to the two holes for the synthetic material matrix and the outlet for the extruded material, has an additional side opening, which serves to supply endless fibrous material. The hole for the fiber material is located between the inlet and outlet ports for synthetic material, usually much closer to the outlet. Another important element of the device is a wetting device for fibrous material. The output of this wetting device is connected with the ability to transport with a hole for endless fibrous material in the body of the extruder. According to the invention the wetting device has at least one pair of interacting with each other wetting rollers, which are rotated in opposite directions. In principle, you can install several pairs of such rolls each other or next to each other. However, in the General case reasonably limited to one pair of what ereference region of the wetting rolls, i.e. in the region of their perimeter, supply is required for the wetting fluid synthetic material so that the side surface of the wetting rolls during operation constantly covered with fluid synthetic material.

To obtain a compact design it is recommended to place the wetting rolls in the surrounding casing rigidly connected to the housing of the extruder. This means that this building is located in the area of the side holes for feeding fibrous material. It is expedient to provide a side opening in the area of the mixing zone of a screw extruder. Preferably, before the case where the wetting rolls, was also installed steam driven in rotation in opposite directions retractable rolls through which the endless fibers of the fibrous material may be submitted with the possibility of control in the gap between the wetting rolls.

In principle, the screw extruder may be extruded cavity single screw. However, the best mixing is achieved in mnogoshagovykh extruders. Especially, it is preferable to use a twin screw extruder, the screws which are rotated in the same fibrous material, you can use the wetting rollers with different diameters and to bring them into rotation with the same number of turns to get a different circumferential speed on the lateral surface of the rolls. Obviously, you can also use rollers with the same diameter to provide the required different circumferential speeds of the rolls by means of different gear ratios of the drive of the individual rolls. It is recommended to perform the rotation drive of the wetting rolls such that their circumferential speed can be set and adjusted independently from each other. The easiest way this can be achieved by using a completely separate drives wetting rolls.

Supply fluid synthetic material for wetting the rolls is preferably in the form of branch canal, which departs from the extrusion cavity before opening for flow of fibrous material in the direction of transport, carried out by a screw extruder, and the open end of which is located in close proximity to the side surface of the corresponding wetting roll, so that the result generated by the auger or augers pressure fluid synthetic material part of this material through athletically the reference to the drawing, schematically depicting an embodiment of the invention in cross section.

The drawing shows a cross section of the screw extruder 1, is made in the form of a co-rotating twin screw extruder containing screws 11 and 12. As shown by two arrows, both of the screw 11, 12 preferably are rotated in the same directions. Extrusion cavity screw extruder marked position 2, and the casing of the extruder - position 8. In the housing 8 of a screw extruder 1 in the area of the mixing zone has a side opening 3 extending in the extrusion cavity 2. Above this hole 3 is the housing 7, is rigidly screwed directly to the housing 8 of the extruder. In this case 7 mounted for rotation two of the wetting roller 5, 6 of the same diameter having a cylindrical lateral surface. The axis of rotation of the wetting rolls 5, 6, related to the wetting device 4, are parallel to the longitudinal axis of both of the screws 11, 12. The rolls 5, 6 are rotated in opposite directions from a separate frequency drive motors, and the speed of the wetting roller 5 set is slightly different from the speed of the wetting roller 6, to create a certain treyresearch fibers of fiberglass material (not shown in detail), served in the direction of the arrow through the wetting device 4, was transported in extrainfo cavity 2 through the opening 3. To control delivery of fiberglass material, above the wetting rolls 5, 6 are installed with the possibility of rotation of the two retractable roll 9, 10, which are rotated so that the beam of endless fibers is in a straight line in the gap between the wetting rollers 5, 6. To ensure the required full wetting fluid synthetic matrix material in the gap between the wetting rollers 5, 6 with the lateral surface should be covered with an adequate amount of fluid synthetic material, so that a sufficiently fills the gap between the rollers. For this purpose, in the preferred embodiment of the invention for each of the wetting roller is provided corresponding branch channel 13, 14, which in a certain way (not shown) moves away from the extrusion cavity 2 in the place where you already have a fluid synthetic material that goes through the housing 8 of the extruder and the housing 7 to the side surface of the corresponding wetting roller 5, 6 and ends there hole. Thanks to this portion of the stream of fluid synthetic material may occupait on the side surface of the wetting rolls 5, 6, i.e., fills the gap between the side surface of the wetting rolls 5, 6 and the respective cylindrical recesses in the housing 7, in which they rotate. Due to this constant rotation of both the wetting rolls 5, 6 fluid synthetic material distributed on their lateral surfaces with the same thickness. The flow of material through the two branch channel 13, 14 is designed so that the gap between the wetting rollers 5, 6 with the passage of the beam of endless fibers are quite full.

Due to friction and compression processes in the gap between the rollers is formed very close contact between the fibrous material and a synthetic matrix material and thus ensures complete wetting of the outer surface of the fibrous material. Excess fluid synthetic material is captured wetting rollers 5, 6 and can be easily removed at the corresponding edge inside the housing 7, so that it falls into the opening 3 in the housing 8 of the extruder, forcibly moves the screws 11, 12 of the extruder together with the insertion hole 3 of fibrous material and again mixed with the main stream of synthetic material. The fibrous material may be fed into the extrusion die 12 in the fibrous material will always be kinks. However, since the area of mixing, designed for uniform distribution of the fibrous material in flowable synthetic matrix material may be relatively short, supplied endless fibers predominantly remain relatively great length. The proportion of short fibers is significantly lower than in the known methods. Since the device according to the invention consists only of manufactured in a very simple way of parts and the required rotational drive is available at affordable prices, the overall cost of manufacturing the device according to the invention are very small.

Legend: 1 - screw extruder, 2 - extrusion cavity, 3 - hole, 4 - wetting device, 5, 6 - wetting roll, 7 - hull 8 - housing of the extruder, 9, 10 - retractable roll, 11, 12 auger,
13, 14 - drop channel.


Claims

1. A method of manufacturing a compound from a fluid synthetic material and solid fibrous filler of the reinforcing material, in particular glass fiber by extrusion of these materials from the extrusion cavity to the outside, in which an endless fiber reinforcing material is pre-moistened with synthetic mother of the decomposing those for wetting synthetic material endless fibers are fed through the gap formed between the two driven in rotation in opposite directions of the wetting rollers, the outer surface which has a coating of fluid synthetic material with a thickness sufficient to permanently fill the gap between the rollers synthetic material, and the output of the wetting device in the conveying direction is combined with a side opening of the extruder.

2. The method according to p. 1, characterized in that the fluid synthetic material to cover the wetting rolls away from the extrusion cavity where fluid synthetic material is not mixed with the fibers.

3. The method according to one of paragraphs.1 and 2, characterized in that the supply of moistened endless fibers in the extrusion cavity is carried out in the area of mixing mnogovekovogo extruder, in particular twin-screw extruder.

4. The method according to one of paragraphs.1-3, characterized in that as fluid synthetic material used plasticized thermoplastic.

5. The method according to one of paragraphs.1-4, characterized in that the wetting rollers to create friction in the gap between them result in rotation with varying the gain by setting different speeds of these rolls.

7. The method according to one of paragraphs.1-6, characterized in that the endless fibers fed into the gap between the wetting rollers can control two obkatyvalisj each other retractable roll.

8. Device for the manufacture of the compound of synthetic fluid and particulate fibrous filler of the reinforcing material, in particular glass fiber, comprising a screw extruder, extrusion cavity which is surrounded by the housing of the extruder, in addition to the inlet and the outlet for extrudable synthetic material has a side hole for feeding endless fibrous material, and a wetting device for the supplied fiber material, the output of which in the conveying direction is connected with a side opening, wherein the wetting device has at least one pair of interacting wetting rollers, which are rotated in opposite directions, with the gap, existing between the wetting rollers, forms the output of the wetting device, and in the peripheral region of the wetting rolls is located a supply of fluid synthetic material so that the side surface of istwo under item 8, characterized in that the wetting rollers are located in the surrounding casing rigidly connected to the housing of the extruder.

10. Device according to one of paragraphs.8 and 9, characterized in that the casing is installed, at least one pair of driven in rotation in opposite directions retractable rolls through which the endless fibers of the fibrous material may be fed into the gap between the wetting rollers with control.

11. Device according to one of paragraphs.8-10, wherein the screw extruder is mnogochasovym extruder, particularly a twin-screw extruder.

12. The device according to p. 11, characterized in that the screws co-rotating twin screw extruder are rotated in the same directions.

13. Device according to one of paragraphs.8-12, characterized in that the wetting rollers to create friction in the gap between them is made with the possibility of bringing in rotation with different cutting speeds.

14. The device according to p. 13, characterized in that the wetting rollers have the same diameter, and their drives are made with the possibility of independent from each other, the speed control.

15. The device according to p. 14, characterized in that the actuators of the wetting rolls the implementation of the practical material made in the form of branch channels, which depart from the extrusion cavity in front of the hole in the direction of transport augers and the open end of each of which is in close proximity to the side surface of the corresponding wetting roll.

17. Device according to one of paragraphs.8-16, wherein the hole is located in the area of the mixing zone of a screw extruder.

 

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