CN114007967A

CN114007967A - Method for placing fiber strips in a can

Info

Publication number: CN114007967A
Application number: CN202080044072.XA
Authority: CN
Inventors: 托马斯·巴尔文; 马丁·多文; 亚历山大·霍恩; 安德烈亚斯·泽博德卡
Original assignee: Trutschler Group Europe
Current assignee: Trutschler Group Europe
Priority date: 2019-06-19
Filing date: 2020-02-07
Publication date: 2022-02-01
Anticipated expiration: 2040-02-07
Also published as: EP3986816A1; CN114007967B; EP3986816B1; WO2020253997A1

Abstract

The invention relates to a method of placing fibre material in a can (1), the method having a first step in which a coil head of fibre material is positioned above the can (1) to a predetermined starting position (2) middle. Then there is a cycle. Said circulation comprises a first circulation step in which a predetermined length of fibrous material is placed in said can (1). In other words, the position of the coil head has not changed. Next, in the second loop step, the coil head is removed from the current position according to predetermined information. The predetermined fiber material lengths differ from each other between at least two cycles.

Description

Method for placing fiber strips in a can

Technical Field

The invention relates to the placement of fibrous material in a can.

Background

A method for depositing fibrous material, in particular fiber slivers, comprises the rotation of a stationary can winding disc above a can. When the can is circular, the can rotates, and when the can is rectangular, the can oscillates. This allows the next layer of sliver to be placed over the same sliver ring of the previous sliver layer after each revolution or oscillation of the can. Whereby the crossing points of the individual layers of laid fiber strips are vertically stacked. This allows the height of the sliver to grow rapidly. In order to be able to place the fibre material sufficiently, the fibre strand must be pressed strongly, which adversely affects the quality of the fibre material.

To cope with this problem, it is known to vary the position of the coil head irregularly. The disadvantage is that it is completely uncertain where the crossing points are formed and how many layers of fibrous material are superposed on these points. It may particularly occur that at some crossing points the number of layers stacked is considerably smaller than at other crossing points, so that the maximum amount of fillable fibre material is reduced. In the result, it cannot be predetermined how much fiber material can be placed in the can. This displacement of the can end also causes an unstable and sudden movement and thereby a loading of the can be achieved.

Disclosure of Invention

The object of the invention is to remedy the aforementioned disadvantages.

This object is achieved by the objects of the independent claims. Advantageous variants are given in the dependent claims.

The method according to the invention for placing a fiber material in a can has a first step in which a winding head of the fiber material is positioned above the can into a predetermined starting position. Followed by a cycle. The cycle includes a first cycle step in which a predetermined length of fibrous material is placed in the can. In other words, the position of the winding head is not changed. Then, in a second loop step, the can is removed from the current position according to predetermined information. This means that it is precisely determined how much fibre material is placed in the can by the can winding head in the holding position. The predetermined displacement of the can ends reduces the number of layers stacked at the respective intersection points when the number of layers is predetermined, and thereby makes it possible to maximize the filling quantity and/or in particular positively influences the quality of the laid fiber material. The predetermined fiber material lengths differ from each other between at least two cycles. This makes it possible to predictably vary the position of the point of intersection, in particular when the can is circular, also when there are only two predetermined positions of the can end.

This cycle is preferably repeated until the can is filled.

The predetermined length of fibrous material preferably corresponds to the output quantity during one revolution of the can. This is a form which can be realized very simply in terms of control technology in order to optimize the placement of the fibre material.

The predetermined length of fibrous material may alternatively or additionally be matched to the output volume during placement of the loop of fibrous material. This makes it possible to change the position of the winding head several times during the laying of the layer of fibrous material, which is laid down in one revolution of the can. The winding head can be displaced from the end position to the other position in a stepwise or continuous manner.

The displacement of the winding head is preferably carried out between a plurality of predetermined end positions of the winding head in at least one cycle. This increases the degree of freedom, so that the fibre material can be optimally placed.

The placement of the sliver is preferably performed such that the number of loops of fiber material prevented from being placed in one revolution of the can is an integer. This means that after one revolution of the can, not the start of a fiber band, but later. This also reduces the number of layers stacked at each intersection.

The displacement of the loop bar head is preferably carried out in such a way that the loop bar head is accelerated in a targeted manner at the beginning of the displacement processes and/or is braked in a targeted manner at the end of the displacement processes. This results in a relatively small load on the can winding device, which has the winding head and moves the winding head.

The deposited fibrous material preferably relates to a fiber strand.

Drawings

Additional features and advantages of the present invention are set forth in the description of the preferred embodiments that follows. In the figure:

figure 1 shows a round can in two filling states of a method for laying down a fibre material according to a first embodiment of the invention,

figure 2 shows two drawings relating to the placement of fiber strands in a circular can according to a second embodiment of the invention,

figure 3 shows a circular can filled by a fibrous material placement method according to a third embodiment of the present invention,

figure 4 shows a larger circular can filled by a fibrous material placement method according to a third embodiment of the present invention,

figure 5 shows a round can filled according to a method of placing a fibrous material according to a fourth embodiment of the invention in two filling states,

figure 6 shows a diagram illustrating placement methods according to other embodiments of the present invention,

fig. 7 shows a circular can in two filling states of the method for placing a fibrous material according to the embodiment of the invention shown in fig. 6d, and is also represented in a side view.

Detailed description of the preferred embodiments

Fig. 1 shows a circular can 1 in two filling states of a method for placing a fibrous material according to a first embodiment of the invention. Fig. 1a shows a state of the can 1, in which the can has completed a single revolution during filling with fibrous material. When reference is made here to the placed fiber strand loops, only the uppermost fiber strand loop is assigned in each case with the reference numeral 7 in the figures. An air hole (blowhole) 5 is gradually formed in the center of the can 1. As can be seen, the position of the winding head is changed from position 3 to position 2. The

positions

2, 3 always represent the center point of the respectively placed fiber strand loop 7.

When the can 1 is filled, the state shown in fig. 1b is assumed. As can be seen, the air holes 5 have become very small. The number of layers of fibre material at the crossing point is thereby likewise reduced in the vertical direction, in other words in the direction into the paper or out of the paper according to fig. 1.

Fig. 2 shows two drawings concerning the placement of fiber strands in a circular can 1 according to a second embodiment of the invention. According to the method shown in fig. 2a, there are three positions 3-5 for the winding head. As a variant, the drawing shown in FIG. 2b has different lying planes 6₁-6₅. As can also be seen here, the air holes 5 are likewise very small. In the lowermost plane (position 4), the ring 7 is preferably placed along the interior of the can 1, which is not further shown. The winding head is thereafter switched to position 3, which coincides with the middle position of the winding head. Thereafter, the winding head is moved to position 2 or left in position 2 in two superimposed planes. Thereafter, the winding head is moved again to position 4 and subsequently to position 2. The change between said positions 2-4 is therefore always made after a single revolution of the can or after the length of the sliver, which is placed at the respective position 2-4 during a revolution of the can. The data relating to the respective sliver length can be stored in a database in conjunction with the respective position of the winding head and can be read simply by means of the controller of the winding head. A method for moving the can end or leaving it in place is thus obtained which can be implemented very simply.

Fig. 3 shows a circular can 1 filled by a fibrous material placement method according to a third embodiment of the present invention. Here again three placement positions 2-4 are present. However, the fiber strips are placed such that they move successively to the positions (in the order of 2, 3, 4, 2, 3, 4 … …).

Fig. 4 shows a circular can 1 filled by a fibrous material placement method according to a third embodiment of the present invention. However, the diameter of the circular can 1 shown here is larger than in fig. 2. Thus, a different placement diagram is given in fig. 4 compared to fig. 2.

Fig. 5 shows a round can 1 in two filling states of a method for placing a fiber material according to a fourth embodiment of the invention. In this embodiment, again, there are only two

positions

2, 3 for the winding head. However, during a revolution of the can, the winding head is continuously moved from position 2 to position 3 and back again. In other words, the distance of the fiber band ring 7 to the inner wall of the can 1 preferably varies continuously. In addition, according to fig. 5a, after a turn of the can, the fiber sliver ring 7 bears against the inner wall of the can 1 with a slight rightward displacement with respect to the vertical center axis. At the beginning of the placement of the fiber strand, however, the center point of the respective fiber strand loop 7 is directly on the central axis. In other words, the position 2 to which the winding head repeatedly moves "wanders" along a circumferential line around the centre point of the can 1.

When the can 1 is filled, the placement diagram shown in fig. 5b is presented. As can be seen here, the air holes 5 become very small again.

Fig. 6 shows three charts demonstrating different placement methods.

According to fig. 6a, the position of the winding head is here shifted between two

positions

2, 3 only during the first three revolutions of the can. Thereafter, the loop end is left in position 3, as is known in conventional placement methods. The effect of the dotted line is to indicate the corresponding turning point of the diagram in relation to each revolution of the can.

According to fig. 6b, the change between the

positions

2, 3 is repeated after each can rotation and is repeated until the can 1 is filled during n can revolutions.

According to fig. 6c, the change between

positions

2, 3 is carried out after a can has been rotated slightly more than one revolution (for example after a can has been rotated 370 °) and again until can 1 is filled during can n revolutions.

According to fig. 6d, the change between

positions

2, 3 is alternately carried out after a can of slightly less than one revolution (for example after a can has rotated 350 °) and after just one revolution of the can, and again, until can 1 is filled during n revolutions.

Fig. 7 shows the circular can 1 in three filling states according to the fiber material placement method of fig. 6 d. Fig. 7a shows the can 1 in a state in which a single turn has been completed during filling with fibrous material, and fig. 7b shows the can 1 after two turns.

Fig. 7c shows the effect of the change in position of the winding head when the can 1 is filled. The transformation "wanders" the generally vertically stacked and corresponding position of the two directly stacked ribbon loops 7, more precisely diagonally to the right and upwards. It is clear that, therefore, when the can 1 is filled, fewer layers are vertically stacked at the intersection.

The invention is not limited to the embodiments given hereinbefore. The embodiments can be interchanged in any form or combined with one another.

The number of said positions to which said can heads are moved may vary. This number may in particular be greater than 3.

The present method is not limited to a particular fibrous material. The fibre material is preferably a fibre sliver, but may also be a roving.

The method according to fig. 5 can be combined with the method according to fig. 1, for example, in such a way that the ring position 7 according to fig. 5a changes after one revolution of the can, while the can end likewise changes its position.

In all methods, the angle of rotation of the can 1 with respect to the change in position of the can winding head can be always or only partially the same, smaller or larger than 360 °.

The invention consequently provides a very universally applicable method in which it can be predetermined where the crossing points are located and how many layers are expected to overlap at the crossing points.

List of reference numerals

1 can

2-4 position

5 air holes

6_i，iE.n placement plane

7 fiber strip ring

Claims

1. A method of placing fibre material in a can (1),

·It has:

- a first step in positioning the coil head of fibrous material above said can (1) in a predetermined starting position (2), and

- a cycle of repeated implementations, consisting of

a first circulation step of placing a predetermined length of fibrous material in said can (1), and

a second cyclic step of removing the coil head from the current position (2-4) immediately according to predetermined information,

- wherein the predetermined fiber material lengths differ from each other between at least two cycles.

2. The method according to claim 1, wherein the repetition is carried out until the can (1) is filled.

3. The method according to any one of the preceding claims, wherein the predetermined length of fibre material corresponds to the output during one revolution of the can.

4. The method according to any one of the preceding claims, wherein during the placement of the loop of fibrous material (7), the predetermined length of fibrous material corresponds to the output.

5. The method according to any one of the preceding claims, wherein, in at least one cycle, the shifting of the coiling head is performed between a plurality of predetermined end positions (2, 4) of the coiling head set.

6. The method according to any one of the preceding claims, wherein the laying of the fiber strands is carried out such that the number of loops (7) of fiber material that prevents the laying of the fiber material in one revolution of the can is an integer.

7. The method according to any of the preceding claims, wherein the displacement of the coil sliver head is carried out by

a targeted acceleration of the coiling head at the beginning of each displacement process, and/or

• The coiling head is braked in a targeted manner at the end of each displacement process.

8. The method of any preceding claim, wherein the fibrous material is a fibrous strand.