JPS6344875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a reticulated belt comprising a number of coils of heat-set synthetic resin monofilament.

For example, DE 24 19 751 A1 describes a mesh belt with a large number of coils. In the case of this mesh belt, adjacent coils are combined and their windings form a channel. An inset wire is then inserted into that channel. Additionally, each coil is biased like a tension spring and contracts longitudinally, causing the windings of adjacent coils to engage and press against each other on the plug wire. However, when this is used, for example, in a paper machine, it is inevitable that the windings of adjacent coils rub against each other as the mesh belt travels around the roll and its coils articulate around the spigots. As a result, the windings of each coil were worn out, resulting in a short lifespan. In addition, in the mesh belt of this specification, if the windings of adjacent coils are not engaged or pressed against each other, the windings of adjacent coils will not be rubbed and wear can be avoided, but the windings of each coil The line moves along the inset line, shifts, and is unable to maintain its position.

Therefore, the present invention aims to ensure that, in this kind of mesh belt, the windings of each coil do not wear out and have a long service life, and that the windings of each coil do not move along the insertion line. This was done for the purpose of being able to maintain its position without shifting.

This invention consists of a large number of coils of heat-set synthetic resin monofilament, the adjacent coils 1 and 2 are combined with each other, the windings 3 and 4 of the coils are inserted between the windings of the adjacent coils, and the the wires are in contact with each other and the connecting means pass through the channel 5 formed by the windings of said adjacent coils;
In the reticular belt in which the filaments of the coils 1 and 2 are not twisted, the coils 1 and 2 are not biased like a tension spring, and the connecting means consists of a plug wire 6, and the winding 3 and 4 are characterized in that they cut into the material of the insertion wire 6 to some extent.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

A conventional mesh belt, shown in detail in FIG. 1, consists of two elongated coils 1 and 2, with coil 1
The winding 3 of the coil 2 and the winding 4 of the coil 2 are fitted into each other. An insertion wire 6 is inserted into the channel formed at this time. Since the coils are heat-set in narrow turns before interfitting, they are pretensioned together perpendicularly to the drawing, causing friction and wear during operation. The channel 5 formed by the overlapping windings has a height h. diameter d
h must be greater than d so that the insertion line 6 of can be inserted from one edge of the mesh belt to the other without difficulty. Between the bends of the windings 3 and 4 and the plug-in wire 6, a point contact is made at 7 and 8, which leads to wear. Furthermore, grooves are formed on the surface of the mesh belt at 9 and 10, which are reflected on the paper and produce marks. Since the height h of the channel is greater than the diameter of the plug-in wire 6, a further offset of the individual windings occurs perpendicular to the plane of the mesh belt. In the production of conventional reticulated belts, therefore, the winding leg 11 of one winding is connected to the winding leg 1 of another winding.
Special care must be taken to ensure that it is on the same side as 2. If these do not line up on one side, you will have to make another mark on the paper.

FIG. 3 shows a sectional view of the mesh belt of the invention in the longitudinal direction to the mesh belt and perpendicular to the insertion line 6. FIG. The winding curvatures 13, 14 are in contact with the plug-in wire 6 over an angle of approximately 180°. The inner diameter of the winding bends 13, 14 therefore approximately corresponds to the radius of the plug-in wire 6. Therefore, the loads appearing at points 7 and 8 in the conventional mesh belt shown in FIG. 1 are distributed linearly in the mesh belt of the present invention, and wear is greatly reduced. The semicircular winding bends 13, 14 transition into straight legs 11, 12. Therefore, in the longitudinal direction of the insertion wire 6, the winding legs 11 and 12 pass each other in a straight line as shown in FIG. 3, and the grooves that occur at 9 and 10 in conventional mesh belts are not formed. In the reticulated belt according to the invention, the winding legs 11
and 12 on one side, marks due to displacements perpendicular to the mesh belt of the individual spirals also do not occur. At the same time, in the reticulated belt of the present invention, the open spaces are of equal shape, ensuring uniform transmission of the entire reticulated belt.

In the mesh belt of the present invention, the insertion line 6 is the tenth
It is preferable to form a corrugation on the surface of the reticulated belt as shown in FIG.
It corresponds to the pitch of The waveform of the insertion wire 6 prevents the windings 3 and 4 from shifting laterally.

The coils 1, 2 of this mesh belt are not biased like tension springs. They are immobile in the mesh belt and have no tendency to shrink. Therefore, in the reticulated belt of the invention, the windings 3, 4 are not compressed and do not exert any force on each other.

The wires forming the coils 1, 2 are not twisted in any way. Figures 5 and 6 show coils in which the wires are twisted or untwisted.

The production of the mesh belt of the present invention essentially involves inserting a number of windings 1, 2 into each running coil, i.e., inserting winding 3 of coil 1 between windings 4 of the next coil 2. done in a manner. At this time, the coils are respectively inserted to such an extent that the windings of adjacent coils cooperate to form the channel 5. An inset wire 6 is inserted into each of these channels.
Channel 5 naturally has sufficient dimensions for this purpose. Generally, a straight plug-in wire 6 is inserted. After insertion of all plug-in wires 6, the mesh belt is tensioned longitudinally and heat set. The windings 3, 4 are deformed by heat setting into the oval shape shown in FIG. 3 having semicircular winding bends 13, 14 and straight winding legs 11, 12, and the winding bends The parts 13, 14 are in close contact with the plug-in line 6.
The insertion line 6 is transformed into a wavy line on its side as shown in FIGS. 10 and 11.

Since heat setting is performed only after the reticulated belt is joined, coils 1 and 2 are first connected to the plug-in wire 6.
can have a shape that allows it to be inserted as easily as possible into the channel 5 formed by the winding bends 13, 14. Only after a later heat setting the coil is given a flat, oval cross-section and the winding legs 11,1
2 is equal to the diameter of the insertion line 6. The surface of the reticulated belt is thereby very flat and does not cause any markings.

Therefore, coils having any cross-sectional shape, such as circular or elliptical, can be used to manufacture the reticulated belt of the present invention. Winding curved portion 13 shown in FIG.
14 belongs to a coil with an elliptical cross section.

The pitch of the coil to be adopted is not determined,
It may be between 1 and 2 times the wire diameter. It is also possible to use coils with even larger pitches. When using a coil with a pitch smaller than twice the wire diameter,
Before interfitting, the coils are pulled together until the pitch approximately corresponds to twice the wire diameter.

Generally, therefore, rather than windings being wound tangentially, coils are used whose pitch is larger than the wire diameter, and in particular the pitch should be somewhat larger than twice the wire diameter. This simplifies the interconnection of the coils. The manufacture of such a coil will be explained later in connection with FIG.

Adjacent coils 1, 2 preferably have opposite winding directions as shown in FIG. As a result, the winding curved portions 13, 14 are joined particularly well. This is because the tangents at the winding bends 13 or 14 have the same spatial alignment. However, it is also possible to alternate a number of coils with right rotation and a number of coils with left rotation. In mesh belts it is also possible to use only coils with the same direction of rotation; however, in this case special care may be required to avoid skewing of the mesh.

When using a coil with enlarged winding curvature 13, 14, the desired pitch of the coil depends not only on the thickness of the coil wire but also on the winding curvature 13, 14.
It also depends on the width. The pitch of the coil is preferably at least twice the wire diameter, and at most equal to the sum of the wire diameter and head width.

Mutual coupling of the two coils is relatively simple due to the precisely defined free space between the windings. When using coils with enlarged winding bends 13, 14, the two coils are placed sideways and overlapping (Fig. 9a), the coils are expanded somewhat vertically, and the two presses are It is passed between rolls, thereby causing mutual compression (FIG. 9b). After removing the tension on the coil, the thickened head or winding curvature 13, 14 holds the coil in position so that the plug-in wire can be inserted. Insert the next coil in the same way.

The flared head is brought between the turns of adjacent coils when the coils are joined together. If the intermediate space between the windings is somewhat smaller than the width of the head, the coils only need to be expanded minimally to accommodate the head. This is an advantage over wires where the windings are wound tangentially and therefore must be stretched over each other to more than twice their original length. Large enlargements of such coils are very difficult due to the high precision required. This is because even relatively small irregularities in the wire, for example, will result in different expansions in coils of different cross sections.

After bringing the head of the coil to the adjacent coil, the expansion is stopped and the windings of the mutually joined coils are juxtaposed without pretensioning. The flared head prevents the coils from coming loose from each other again. The plug-in wire can therefore be inserted without difficulty. FIG. 7 shows this mutually restrained state of the coils.

The mesh belt is not ready for use even after the coils have been joined together and the plug wires have been inserted. In order to avoid the risk of marking the paper, the surface of the mesh belt must also be smooth. Furthermore, the windings of the coil are still freely movable on the plug-in wire. Such movement of the windings can easily occur when using mesh belts, creating the risk that the coils will remain stretched due to friction. Furthermore, the coils are pressed against each other in places, and the coils are no longer free of pretension at those locations. At these locations, external forces therefore cause the pitch of the coil to be smaller than twice the wire diameter. Similar defects can also be caused by variations smaller than the wire diameter. All these defects cause the mesh belt to wrinkle when it is installed, for example in a paper machine, thereby rendering it unusable.

These problems are eliminated by the aforementioned heat setting of the reticulated belt. Heat setting eliminates the tensile spring characteristics of the coils that may occur, smoothes the surface of the reticulated belt, and causes the individual windings to dig into the spigot material somewhat, causing the spigot to become corrugated. This prevents the individual windings from shifting laterally. The enlarged head of the coil winding not only prevents the coils from loosening relative to each other prior to insertion of the plug wire, but also reduces wear between the winding and plug wire.
This is because the head has a larger contact surface with the insertion wire than the undeformed wire. Furthermore, since the contact surface between the insertion wire and the coil wire is enlarged by the head, the winding curved portions 13 and 14 are enlarged.
The load on the insertion wire at will go in a more favorable direction. If the wire is not deformed, i.e. without an enlarged head, the insertion wire will be subjected to additional shear stress (Fig. 10), whereas the synthetic resin wire will suffer from the longitudinal orientation of its macromolecules. Therefore, it merely presents a moderate amount of resistance. Due to the presence of the enlarged heads, which overlap each other - viewed in the longitudinal direction of the mesh, part of the insertion line is sandwiched between the heads, and the shear stress is significantly reduced (FIG. 11).

If the tension exerted on the reticulated belt and the applied heat during heat setting do not result in a perfectly smooth surface, additional pressure is applied perpendicular to the reticulated belt surface, for example by means of a heating plate. The deformation of the original circular or elliptical coil into an oval shape therefore no longer depends exclusively on the amount of tension exerted.

Since the already assembled reticulated belt is exposed to heat setting for the first time, the temperature, tension and possibly pressure exerted by the heating plate will not only cause the windings 3, 4 to form a flat oval shape; The windings 3, 4 are selected so that they penetrate somewhat into the material of the plug-in wire 6. A displacement of the windings 1, 2 along the insertion line 6 is thus prevented, which could occur, for example, when drawing a sieve belt into a paper machine and could cause waves in the sieve belt. Movement of windings 1, 2 is avoided. Intermediate spaces between the coils are likewise prevented.

In order to achieve a good and uniform heat supply over the entire thickness and surface of the reticulated belt, the heat is preferably supplied by a heated air stream.

FIG. 8 shows an apparatus for manufacturing a synthetic resin coil without twisting. This device consists of two rotating mandrels.
0 and a cone 22 that is reciprocably guided at its end. The coil connects the first wire 18 to 19
The mandrel 20 is guided to a mandrel 20 rotating at high speed. The first wire 18 is therefore first wound onto the mandrel 20 with winding to winding contact. The high speed reciprocating movement of the cone 22 forces it through the mandrel 20 to the right as viewed in FIG. After a few windings, at 23 a second wire 24 of high temperature resistant material is passed onto the mandrel 20 and is located between the windings of the first wire 18 . As a result, the windings of the first wire 18 are pressed together, so that the spacing between the windings of the first wire can be set more precisely by the thickness of the second wire 24. It is also possible to feed both wires to the mandrel 20 at approximately the same location. However, in order to prevent the cone 22 from pressing the two lines together, they must form a 90° angle with each other. The second wire 24 passes through a heat set region in conjunction with the first wire 18 for a predetermined number of windings, where the coils formed by the first wire 18 are heated while being pressed together. It is fixed by device 29. After passing through the heat set area, the second line 24
leaves the mandrel 20 at 28 and is then wound onto a reel or returned to position 19 again on a closed track provided with clamping and braking devices. The coil formed by the first wire 18 is fixed in the desired shape and falls off the tapering mandrel 20 and into the storage container 30. As the coil rotates about its axis, the storage container 30 must follow this rotational movement synchronously. This is because otherwise the coil becomes a tangle that is difficult to untangle.

In this way a coil is made from the first wire 18,
The pitch is set exactly between twice the wire diameter and the sum of the wire diameter and head width, and the wire is not twisted.

When producing coils with enlarged heads or winding bends 13, 14, the wire is wound onto a mandrel 20 with an oval cross section. Due to the oval cross-section, the wire tension increases periodically during winding, and increases sharply whenever the first wire 18 is over the rounded side of the oval mandrel 20. The wire tension is selected such that a sudden increase in tension causes a deformation of the wire. The first line 18 expands somewhat at this location, increasing its dimension parallel to the axis of the mandrel 20. The coil is therefore provided with an enlarged portion of the wire at the oval outer end or winding bends 13, 14 (FIG. 7).

When manufacturing a coil in the usual way, winding 3,
The line 4 is twisted, which results in an S in which the winding legs extend vertically in plan view (FIG. 5). The location of the deformation cannot be predetermined and therefore juxtaposed windings will generally have a larger spacing than would be expected from the linearity.

FIG. 6, on the other hand, shows a coil made without twist, ie, the wire is not twisted during the manufacture of the coil. Untwisted coils interconnect flatly with other untwisted coils. Since there is no distortion or deformation of the windings, the coil no longer requires a length other than that corresponding to the wire diameter and the number of windings after interconnection.

Coils made with twist cannot become untwisted by subsequent heat setting. This is because the high temperatures required for this lead to a deterioration of the properties of the synthetic resin material and its deterioration.

Example: A coil with an oval cross section is made from a polyester monofilament with a thickness of 0.7 mm, and the maximum and minimum diameters of the oval are
Make it 6.8 and 3.8mm. The width of the head should be 0.93mm, and the pitch should be 1.54mm. 0.9 as an insertion line
Using polyester fibers with a thickness of mm. The thickness of the reticulated belt is 3.8 mm before heat setting, and the number of insertion lines is 23 per 10 cm of reticulated belt length. The number of helical windings is 65 per 10 cm of mesh belt width. After heat setting, the thickness of the reticulated belt is 2.5 mm, the number of insertion wires is 20.3 per 10 cm of reticulated belt length, and the number of windings is 65 per 10 cm of reticulated belt width. The weight of the mesh belt is 1450Kg/m ² and the air permeability is
It is 950cfm. The maximum or minimum dimension of the oval cross section of the coil is 7.2 or 2.5 mm after heat setting.

As explained above, according to the present invention, a plurality of coils 1 and 2 are combined, and the insertion wire 6 passes through the channel 5 of the windings 3 and 4 of the adjacent coils 1 and 2, but the coils 1 and 2 It is not biased like a tension spring and does not contract lengthwise. Therefore, on the plug wire 6, the adjacent coils 1 and 2
windings 3 and 4 do not engage and are not pressed against each other. Therefore, as the reticulated belt advances around the roll and the coils 1, 2 articulate around the plug-in wire 6, the windings 3, 4 of the adjacent coils 1, 2
Will not rub or wear out. Therefore, its lifespan is long. Furthermore, according to the invention, after insertion of the plug-in wire 6, the coils 1, 2 are heat-set so that their windings 3, 4 dig somewhat into the material of the plug-in wire 6. Therefore, the windings 3 and 4 of each coil 1 and 2 do not move or shift along the insertion wire 6, and can maintain their positions.

[Brief explanation of drawings]

FIG. 1 is a detailed longitudinal sectional view of a conventional mesh belt, FIG. 2 is a detailed longitudinal sectional view of the mesh belt before heat setting, and FIG. 3 is a detailed longitudinal sectional view of the mesh belt according to FIG. 2 after heat setting. Figure 4 is a plan view of a part of a mesh belt, Figure 5 is a coil whose wire is twisted during manufacturing, Figure 6 is a coil manufactured without twisting, and Figure 7 is an enlarged winding curve. Figure 8 is a schematic diagram of a coil manufacturing device with no wire twist, Figure 9 is a schematic plan view of mutual joining of coils, and Figures 10 and 11 are windings. A comparison of methods for avoiding shearing of the inset line with an enlarged head curvature is shown. 1, 2... Coil, 3, 4... Winding wire, 6... Plug-in wire, 11, 12... Winding leg, 13, 14...
...Winding curved part.

Claims (1)

[Claims] 1. Consisting of a large number of coils of heat-set synthetic resin monofilament, adjacent coils 1 and 2 are combined with each other, and windings 3 and 4 of the coils are inserted between the windings of the adjacent coils. , in a reticulated belt in which the windings are in contact with each other and the connecting means passes through a channel 5 formed by the windings of the adjacent coils, so that the filaments of the coils 1, 2 are free from twisting, characterized in that said coils 1, 2 are not biased in the manner of tension springs, said coupling means consist of a plug wire 6, said windings 3, 4 are somewhat wedged into the material of said plug wire 6. A mesh belt. 2. The windings 3, 4 of the coils 1, 2 are egg-shaped and have substantially parallel winding legs 11, 12 and substantially semicircular winding curves 13, 14. The reticulated belt according to item 1. 3. The windings 1, 2 are attached to the filaments of the coils 1, 2 in the regions of the winding curved portions 13, 14.
3. The reticulated belt according to claim 2, further comprising a longitudinally enlarged portion. 4. The pitch of the coils 1, 2 is selected to be between twice the thickness of the filament and the sum of the thickness of the filament and the width of the curved portions 13, 14 of the enlarged winding. A mesh belt according to claim 3. 5 The heat-set synthetic resin coils 1 and 2 are combined, the windings 3 and 4 of which are arranged between the windings of adjacent coils, the channel 5 is formed by the overlapping windings of said coils, and the plug-in wire 6 passes through the channel, and a coil 1 with no twist;
2 is used, after the insert wire 6 is inserted, the mesh belt is heat set at a certain temperature and with a certain longitudinal tension, so that the tensile spring characteristics of the coils 1 and 2 are A method characterized in that the windings 3, 4 of the coil are removed to some extent into the material of the plug-in wire 6. 6. The method of claim 5, wherein during said heat setting said pressure is applied to the surface of said reticulated belt. 7. The method according to claim 5 or 6, wherein the heat for the heat setting is supplied by hot air.