JPS60219034A - Manufacturing of short fiber reinforced elastic sheet - Google Patents

Abstract

PURPOSE:To maintain a desired orientation of bundles of short fibers by forming upper and bottom surfaces of a designed sheet with a consolidation of transverse sections of narrow strips that are cut with a prescribed angle of inclination including verticality from a sheet in which the bundles of short fibers were oriented in parallel to a surface of the sheet into which the fibers have been buried. CONSTITUTION:An elastic sheet 1 in which bundles of short fibers are oriented in the longitudinal direction of the sheet and in parallel to the surfaces of the sheet and almost uniformly mixed is cut in the direction of JK against the sheet with an interval of JB. Narrow strips 5 that are obtained by cutting are turned and respective side surfaces 6 of the narrow strips 5 are joined together one by one, and a reinforced elastic sheet 7 in which short fibers are oriented vertically to the surface of the sheet is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an elastic sheet reinforced with short fibers, that is, cut fibers, more specifically, an elastic sheet made of rubber or synthetic resin in which the short fibers are placed in a certain vertical or diagonal direction. The present invention relates to a method for manufacturing a short fiber-reinforced elastic sheet formed by oriented fibers.

Conventionally, methods for improving the abrasion resistance of sheet rubber compositions include adding fillers with a high reinforcing effect to the rubber, using elastomers with excellent abrasion resistance, or adding wear-resistant granules to the rubber. Methods such as embedding it in an elastic body have been proposed, but none of them have been able to exhibit sufficient effects on wear resistance and impact resistance.

For example, to explain the case of a conveyor belt for conveying crushed stone, a conveyor belt is one in which multiple sheets of canvas are laminated approximately at the center of the conveyor belt, and both the front and back sides are coated with a front cover rubber layer and a back cover rubber layer of a predetermined thickness. When a transported object is heavy during loading or unloading, its surface layer is particularly susceptible to wear, and the front cover rubber layer is damaged by the impact when the transported object is dropped. If this phenomenon is repeated, as the front cover rubber layer wears out, the scratches caused by the damage on the front cover rubber layer will gradually expand, eventually reaching the core canvas, and the strength will decrease due to the canvas absorbing water. The decrease in adhesive strength between the core canvas and the occurrence of peeling, etc., result in a significant shortening of the life of the belt.

In order to deal with this type of problem, the front cover rubber layer is made of short fibers that have a strong property of mitigating the abrasion and impact caused by impact objects even if they hit the front cover rubber layer, and also have a strong ability to prevent belt damage. Conveyor belts have been proposed in which the surface material is a rubber sheet oriented perpendicularly to the layer, but the present invention is based on a rubber or synthetic belt in which short fibers of this type are embedded in an elastic layer while maintaining a certain orientation. A method for manufacturing a resin sheet is provided.

It is relatively easy to embed a group of short fibers in an elastic sheet parallel to the horizontal plane of the sheet in the same longitudinal direction of the sheet. Although it is technically difficult to maintain the angle and bury it in the same direction,
This sheet, which maintains a single direction and embeds precise short fiber groups within the elastic sheet, has flexibility, toughness, and durability.
'There is a great advantage in that the effectiveness inherent in the sheet can be actively and efficiently utilized in many aspects such as impact resistance and abrasion resistance.

This invention was proposed with a focus on the accuracy of the orientation of short fiber groups in this type of short fiber reinforced elastic sheet, and includes a single elastic sheet in which short fiber groups are oriented in a fixed direction (longitudinal direction); Alternatively, after forming an elastic sheet laminate by laminating and pasting a plurality of sheets with the grain direction of the single elastic sheet aligned, the horizontal direction ( The sheet is cut at a predetermined inclination angle including the direction perpendicular to the sheet surface to form a band-shaped small piece group. The present invention relates to a method for manufacturing a short fiber-reinforced elastic sheet, which comprises sequentially joining the side surfaces of the cut band-like pieces with the cut surfaces of the group of pieces positioned on the upper and lower surfaces of a desired sheet, respectively.

Hereinafter, the method for producing a short fiber reinforced elastic sheet according to the present invention will be explained in more detail with reference to the drawings.

FIGS. 1 to 4 and 5 to 8 are perspective views sequentially showing the manufacturing process of a short fiber reinforced elastic sheet according to the present invention, respectively. The first invention comprises an elastic sheet, and FIGS. 5 to 8 show the second invention comprising a laminated elastic sheet, in which short fiber groups are oriented and embedded in a direction perpendicular to the sheet surface. The manufacturing method is shown.

Figures 1 and 5 show a single elastic sheet (1) in which short fibers are oriented and mixed almost uniformly in the longitudinal direction of the belt-shaped sheet and parallel to the sheet surface.
Organic fibers such as aromatic polyamide, aliphatic polyamide, polyester, and vinylidene chloride, inorganic fibers such as glass, carphone, and ceramic, or metal fibers such as stainless steel and alumina are mixed into the unvulcanized elastic body (2) of synthetic resin such as urethane. The short fibers (3), such as Kunimi, are oriented and mixed in the longitudinal direction of the sheet by a known method using a roll or an extruder.

Next, in the second invention, as shown in FIG.
Multiple elastic sheets (1) (4 sheets in the figure), row p1"
Elastic sheet laminate (4) by laminating and pasting in the same direction
form.

Figures 2 and 6 show the single elastic sheet (1) or the elastic sheet laminate (4) cut at intervals perpendicular to the ABFE plane, that is, the sheet surface (plane), that is, in the JK force direction JB. , Fig. 3, and Fig. 7 show the obtained strip-shaped small piece (5) rotated 90° in either the left or right direction around its axis, or to the left in the drawing. In (5), the short fibers change in the direction perpendicular to the B D HF plane, that is, the plane. Figures 4 and 8 show the strip-like pieces (
5) (111 sides (6) are joined one after another, and as a result, the short fibers are placed on both the top and bottom surfaces of the sheet for the purpose of cutting 161 into strips so that the short fibers are oriented perpendicularly to the sheet surface. A reinforced elastic sheet (7) is obtained.

Each of the above methods is an example of a method for producing an elastic sheet in which the short fibers are oriented in a direction substantially perpendicular to the plane of the finished elastic sheet.
Constant tilt angle (90-θ).

A method of manufacturing an elastic sheet oriented in the following manner will be explained below with reference to FIGS. ) are the same except for the cutting angle, so a part of the detailed explanation will be omitted.

FIG. 9 shows an elastic sheet laminate (8
) is cut at an inclination angle of θ° to the plane, that is, J', at intervals of J'B' in the 'direction', and the obtained strip-shaped pieces (9) are cut with their axis centered. It is rotated by (90-θ) degrees to the left or right in the center, or to the left in Fig. 10.
Figure 0) shows the inclination angle (90-θ) of the short edge MAIL with respect to the plane.
Oriented at °.

Figure 11 shows the side surface (6) of the strip-shaped piece (9) thus obtained.
) Reinforced elastic sheet 0Q in which the short fibers are oriented at an inclination angle of (90-θ)° with respect to the finished sheet surface by sequentially joining comrades.
get. Therefore, the smaller the inclination angle (90-θ)°, the smaller the inclination of the short fibers (2).

Next, a specific apparatus used to carry out the above-described sheet manufacturing method will be described with reference to the drawings.

FIG. 12 is a schematic explanatory diagram of a series of devices showing the manufacturing process of the elastic sheet of the present invention.
) or a zone for cutting the elastic sheet laminate (4),
It is composed of a rotation zone for changing the direction of the strip-shaped pieces formed in the front zone, a zone for drying and preheating the strip-shaped pieces, and a zone for joining the strip-shaped pieces.

1] [In step J, short fibers are oriented and mixed in advance in the longitudinal direction of an elastic band-shaped sheet and parallel to the sheet surface, and manufactured by known means such as a roll or an extruder. Single '71t elastic sheet) (1) or an integrated elastic sheet bond (4) (hereinafter simply referred to as elastic sheet) made by laminating and pasting multiple single elastic sheets with their grain directions aligned in advance. The elastic sheet is wound up on a roll α group together with the liner 0■, and is hung on a hanging table 0]) which has a function of rotating by a drive device (not shown), and the elastic sheet is sequentially fed out from the roll H portion in the form of a drawer. The fed-out elastic sheet (1) or (4) is a guide roll (14)
It is guided onto the conveyor belt η while being kept at a nearly constant tension by the pull-out roll 00 configured to rotate by a drive device and the stepped roll 0→ configured to move up and down by its own weight. . Note that the liner 0, which was separated from the elastic sheet (1) or (4) as the elastic sheet (1) or (4) was fed out, is placed on the hanging stand 0.
8) It is wound up on the rotating roll 09) installed above. Then, in the next guiding process, the elastic sheet (1) or (4) is equipped with a rotary round blade cutter (4) equipped with a water injection mechanism on one cutter (4), which can change its inclination as appropriate, and which can be raised and lowered. 0, the elastic sheet (1) or (4) is pressed and cut at predetermined intervals in the rlJ direction to create small strips (5) or (9), and the strips are moved to the next rotation step.

In this rotation process, a cylindrical rotating drum (E) having elongated holes (C) extending in the axial direction on its circumferential surface at equal intervals, for example, with a center angle of 90°, is cut into strip-shaped pieces (5) or ( 9
), the long holes (c) of the drum (a) are installed in such a way that the - - of the long holes (c) of the drum (a) are sequentially rotated. A seal bulkhead pot is installed to form a seal, and this vacuum seal zone is formed by a long hole (28a) corresponding to a small strip located on the rotating shaft surface of the drum, and a long hole (28a) located at the lowest end of the long hole (28a).
8b), and the elongated hole (28a
) The strip-like small piece (5) or (9) that was suctioned and adsorbed to the drum surface at section ) is separated from the vacuum sealing zone by approximately 90° counterclockwise rotation of the drum and rotated to the lowest position of the drum. The strip falls naturally from the hole (28a) onto the conveyor belt ■, and as a result, the small piece of strip moves 9 times around its axis.
After rotating by 0°, the orientation of the short fibers, which was horizontal when picked up by the drum, changes to vertical on the conveyor belt.

Next, in the dryer step 1, the small strip pieces 5) or (9) are dried and preheated by the dryer (c) installed on the conveyor belt to such an extent that moisture is removed, and the strip pieces are sent to the next joining step. will be moved.

In the joining process, after the small strip is held between a conveyor belt and a holding plate, the piston head (c) is fixed to the tip of the piston head (c), which can repeatedly expand and contract.
The strip-like pieces pushed forward from behind by ' are joined together on the side surfaces of adjacent strip-like pieces to form a continuous reinforcing elastic sheet (7) or 00, and the conveyor belt (c),
The liner (31) is moved around the guide roll shaft and wound into a take-up roll (3 pieces) together with the liner (31).

The apparatus shown in FIG. 14 is one of the series of apparatuses explained with reference to FIGS. 12 and 13, and is used for cutting the elastic sheet (1) or (4) into strip-like pieces (5) or (9). This invention is proposed with the intention of being able to synchronize the connection work by joining adjacent pieces of the band-like piece, omitting the process of rotating the small band-like piece about its axis, and further simplifying the mechanism. Therefore, the explanation of the mechanical components similar to those of the previous device will be omitted, and the belt-shaped elastic sheet (1) or (4)
The explanation will focus on the cutting mechanism and the joining mechanism that follows.

Introducing the elastic sheet (1) or (4) into a cylinder (34) having a flat cross-section through its upper opening (35),
A ram head (37) fixed to the tip of a ram rond (36) is installed in the cylinder (34), and this ram head (37) slides inside the cylinder centering around the opening (30 minutes), and the ram head (37) ) A longitudinal cutter (38) is attached to the upper edge of the ram head (37).
A compressed air outlet (39) (39) is opened on the suppression surface to ensure the separation of the band-shaped small piece (5) or (9) cut by the cutter (38) from the ram hend part. There is. and ram head cylinder (34)
An exhaust hole (40) is provided in the upper surface of the plate-shaped cylinder (34) near the maximum protrusion point beyond the opening (35).

Perpendicularly from the opening (35) of the plate cylinder (34),
Alternatively, the elastic sheet (1) or (4) inserted while maintaining a predetermined inclination angle will cause the ram head (37) to move when the lower end of the elastic sheet (1) or (4) comes into contact with the bottom of the cylinder (34). As the elastic sheet advances, the cutter (38) cuts the elastic sheet into a compressed shape to form small strips (5) or (9).In this way, the reciprocating motion of the ram head (371) sequentially cuts, compresses, and Ram head (37
) Due to the jet of compressed air from the tip surface, each band-shaped piece is repeatedly detached from the ram head (3 forces), and the plate-shaped cylinder (
34) The short fibers embedded in the sheet are laid out on the sheet surface vertically or at a predetermined inclination angle. The short fibers mixed into the elastic sheet for the purpose of reinforcement can most effectively achieve the purpose when a certain precise orientation is established according to the purpose, and this reinforcing elastic sheet It is very difficult to orient and embed the short fibers at a predetermined inclination angle, including perpendicular, on the sheet surface of the elastic sheet. Taking advantage of the fact that it is relatively easy to orient and embed short fibers parallel to the sheet surface, this easy-to-manufacture sheet can be reshaped into strips with a predetermined inclination angle, including perpendicular to the sheet surface. By cutting and again forming the upper and lower surfaces of the desired sheet using each cut surface of the band-like small pieces, a reinforced elastic sheet made of short fibers that maintains the desired orientation of the short fibers can be obtained very easily. I was able to do that.

Furthermore, since the reinforced elastic sheet obtained by the manufacturing method according to the present invention is rolled on the sheet surface and the short fibers are oriented vertically or in a predetermined diagonal direction, this sheet can be used, for example, as a front cover of a conveyor belt. When used as a compress, even if crushed stone falls, the ends of the short fibers catch it and reduce the impact force, making the surface less likely to be damaged, and it is also extremely resistant to abrasion caused by heavy objects. When used as the surface layer of conveyor belts, this sheet exhibits excellent effects in a wide range of fields, such as extending the lifespan by 15 to 3 times compared to conventional conveyor belts. In addition to belts, IJ can be expected to have a wide range of uses, such as the wear-resistant parts of tires, entrance mats, and sheets for rooms and hallways.

[Brief explanation of the drawing]

1 to 4 are perspective views showing the manufacturing sequence of a reinforced elastic sheet according to the present invention using a single elastic sheet, FIG. 1 is a perspective view of the single elastic sheet, and FIG. 2 is a perspective view of the single elastic sheet. FIG. 3 is a perspective view of a single elastic sheet showing the cutting points to obtain strip-like pieces; FIG. 3 is a perspective view of the strip-like piece after the direction change;
The figure is a partial perspective view of a reinforcing elastic sheet formed of a group of band-like small pieces, and FIGS. 5 to 8 are perspective views showing the manufacturing sequence of the reinforcing sheet according to the present invention using an elastic sheet laminate. Fig. 5 is a perspective view of a single elastic sheet, Fig. 6 is a perspective view of an elastic sheet laminate showing the cutting points to obtain small strips, and Fig. 7 is a perspective view of the small strip after the direction has been changed. , FIG. 8 is a perspective view of a part of a reinforcing elastic sheet formed of a group of strip-shaped small pieces, and FIGS. 9 to 11 show other embodiments in which the elastic sheet laminate is cut at a predetermined inclination angle. No. 6 shown. A side view corresponding to FIGS. 7 and 8, FIG. 12 is a schematic explanatory diagram showing a series of manufacturing equipment for reinforcing elastic sheets, FIG. 13 is an enlarged detailed view of a part of FIG. 12, and FIG. FIG. 7 is a longitudinal sectional view showing another embodiment of the cutting and joining process section in the sheet manufacturing apparatus. In the figure, (1) is a single elastic sheet, (2) is an unvulcanized elastic body, (3) is short fiber, (4) is a laminate of elastic sheets, (
5), (9) are strip-shaped pieces, (6) are the side surfaces of the strip-shaped pieces, (
7), 0Q indicates a short fiber reinforced elastic sheet.

Claims (2)

[Claims] (1) A sheet in which short fibers are oriented and embedded in the longitudinal direction of the elastic sheet is cut in the width direction of the sheet at a predetermined angle of inclination, including the direction perpendicular to the sheet surface, to form a group of small strips. A method for producing a short fiber-reinforced elastic sheet by positioning the cut surfaces of the small pieces on both upper and lower surfaces and joining the side surfaces of adjacent strip-like pieces. (2) forming an elastic sheet laminate by laminating and pasting a plurality of sheets in which short fiber groups are oriented and embedded in the longitudinal direction of the sheets, with the rows and embedding directions of the sheets aligned;
Cutting the sorted laminate at a predetermined inclination angle including the direction perpendicular to the sheet surface in the width direction to form a group of small strips;
A method for producing a short fiber-reinforced elastic sheet by arranging the cut surfaces of the strip-shaped pieces on both upper and lower surfaces and joining the side surfaces of adjacent strip-shaped pieces.