JPS5847973B2 - Molding method and device for synthetic resin semi-mesh tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for continuous molding of a synthetic resin semi-mesh tube having holes arranged in the longitudinal direction in a part of the curved surface.

Synthetic resin mesh pipes with a mesh formed on the entire circumference of the pipe have been widely used, but depending on the use of the mesh pipe, it is better to form the mesh on only a part of the circumference of the pipe and close the rest. Sometimes it's good.

For example, in the case of a buried drainage pipe, it is convenient to use the lower half as a gutter to drain rainwater that flows into the soil from the mesh in the upper half.

SUMMARY OF THE INVENTION An object of the present invention is to propose a method and apparatus for forming a half-mesh tube made of synthetic resin in which a mesh is formed in the longitudinal direction on a portion of the curved surface of the tube.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, an outer cylinder 1 is fixed to a machine frame (not shown),
An inner cylinder 2 is fitted and fixed inside the outer cylinder 1, and an annular plate 4 covering the upper surface 3 of the inner cylinder 2 is fixed to the upper part of the outer cylinder 1.

An annular lower resin reservoir 5 and an annular upper resin reservoir 6 with an open upper part are formed on the joint surface of the outer cylinder 1 and the inner cylinder 2, and a resin passage 7 communicates between the two resin reservoirs, and the lower resin reservoir The reservoir 5 is connected to an outlet of an extruder (not shown) through a connection hole 8 provided in the outer cylinder 1.

The plate 4 has an annular recess 9 facing the upper resin reservoir 6 as shown in FIG. Annular nozzle 1
0, the remaining part of the inner part is cut out in a comb-like shape to form a groove 11, and the lower part of the comb-teeth is cut out in a range of a predetermined central angle α to form a groove 11 with a height higher than that of the groove 11. The groove 12 is formed to be smaller by a.

A hollow rotary shaft 14 is supported in the hollow part of the inner cylinder 2 by a tapered roller bearing 13, and the shaft 14 is rotated by a subrocket wheel 15 attached thereto.

An annular nozzle 1 is attached to the upper end of the shaft 14 in sliding contact with the inside of the inner ring 12.
A peripheral wall 16 is formed to close the opening 0, and a notch 17 is provided in a part of the peripheral wall 16 as shown in FIG. 3A.

A bottom surface 17a of the notch 17 is approximately at the same height as the inner cylinder top surface 3, and a slope 17b is formed at the rear of the notch 17 in the rotational direction (arrow).

In this case, the upper edge 16a of the peripheral wall 16 as shown in FIG.
closes the lower part of the groove 11 and divides it into independent linear nozzles 18, and in the groove 12, a flat annular nozzle 20 with a thickness of approximately a is provided at the lower part of the linear nozzle 19 corresponding to the groove.
The comb-shaped nozzle 21 similar to the one in which (the shaded part) is combined constitutes a comb-shaped nozzle 21.

Next, the operation of the present invention will be explained.

When the molten resin is injected through the band hole 8 while rotating the shaft 14, the resin is maintained at a melting temperature by a heating device (not shown) and distributed uniformly in the circumferential direction as it reaches the resin reservoir 5, the passage 7, and the resin reservoir 6. However, part of the lower side is discharged in a linear shape from the linear nozzle 18, part of the part is discharged from the comb-shaped nozzle 21 in a shape in which the lower part of the filament is connected by a plate-like wall with a thickness of a, and further part is in an annular shape. The liquid is ejected from the part of the nozzle 10 that faces the notch 17 .

When the discharged resin is drawn upward in FIG. 1, the filaments 22 are arranged at equal intervals in the direction of the generatrix of the tube, and within the range of angle α, the filaments form a tubular body connected by a cylindrical wall 23, and further have notches. The resin discharged from the section 17 is directed to the annular nozzle 10 by the slope 17b.
The spiral thread 24 is separated from the inner resin and pulled upward.
The filament 22 and the inner side of the cylindrical wall 23 are fused together while forming.

In this way, a semi-mesh-like tube is formed in which the filament 22 has a mesh and the other parts have the mesh closed by the cylindrical wall 23.

If a plurality of notches 17 are provided in the peripheral wall 16, the multi-spiral thread 24
Therefore, it is possible to form a semi-mesh tube having a fine mesh with respect to the rotational speed of the shaft 14, or to increase the forming speed for a mesh of the same roughness.

The shape of the notch 17 is determined as appropriate depending on the type of resin used and the molding temperature.

That is, when the melt viscosity of the resin is low, the cut arrow part 17 is made smaller as shown in FIG. Alternatively, the notch 17 may be enlarged so that most of the annular nozzle 10 is opened, as shown in FIG. 3.

The hollow portion of the shaft 14 is used for introducing air for cooling or expanding the semi-reticular tube formed as required, or for introducing cooling water.

In the above structure, the annular nozzle 10, the linear nozzle 18, and the comb-shaped nozzle 21 are formed integrally, but these nozzles may be separated into upper and lower parts, in which case resin feeding passages leading to each nozzle may be provided separately. For example, a semi-mesh tube can be molded using different materials (hard resin and soft resin, different colors, etc.).

FIG. 5 shows an apparatus for forming a semi-reticular tube in which spiral stripes are fused to the outside of parallel stripes.

In the same figure, a fixed outer cylinder 25, an intermediate cylinder 26, and a hollow inner cylinder 2 are shown.
7 are concentrically connected, a circular plate 29 having a center hole 28 is fixed to the intermediate cylinder 26, and a resin reservoir 30 whose upper part is open at the joining surface of the outer cylinder 25 and the intermediate cylinder 26 is communicated with this. A resin passage 31 is formed, a resin passage 32 is formed at the joint surface between the intermediate cylinder 26 and the inner cylinder 27, and a slit-like annular slit is formed between the plate 29 and the upper surface 33 of the outer cylinder 25 and communicates with the resin reservoir 30. A nozzle 34 is formed.

Further, an annular resin reservoir 35 is formed in the plate 29 and communicates with the resin passage 32, and a large number of passages 36 at equal intervals extend radially from the annular resin reservoir 35, and the lower parts of the passages 36 within the range of the central angle α are mutually arranged in the circumferential direction. A flat fan-shaped passage 37 is provided which communicates with the
Passages 36 and 37 open in a conical side surface 38 formed in plate 29 directly above annular nozzle 34 and adjacent to nozzle 34 to form a fixed linear nozzle 39 and an annular nozzle 40, respectively.

Thus, nozzles similar to the linear nozzle 18 and the comb-shaped nozzle 21 shown in FIG. 4 are formed on the outer surface of the plate 29.

A subrocket wheel 4 is mounted on the outside of the outer cylinder 25 with a bearing 41.
2 is supported on the shaft, a circumferential wall 43 that closes the annular nozzle 34 is protruded from the circumferential wall 43, and a notch 44 is provided in a part of the circumferential wall 43 (
FIG. 6) Part of the annular nozzle 34 is opened.

Like the notch 17 in FIG. 1, the notch 44 has a slope 44b at the rear in the rotational direction.

Passage 31. The molten resin fed through the annular nozzle 32 is uniformly distributed in the resin reservoirs 30 and 35, respectively, and is distributed between the opening portion of the annular nozzle 34 facing the notch 44 and the nozzle 39.
and discharged outward from 40.

When the discharged resin is drawn upward, as in Fig. 1,
Parallel filaments 45 along the generatrix of the tube and a cylindrical wall 46 that connects the outer sides of the filaments 45 to each other over an angle α are formed, and the resin discharged from the opening is caused by the rotation of the slope 44b. It is pushed up and becomes a spiral strip 47, which is a spiral strip 4.
5 and the outside of the cylindrical wall 46 to form a semi-mesh tube.

The passages 36, 37 and the annular nozzle 34 may not be separated as described above, but may be formed integrally as in FIG.

The present invention has the above-mentioned configuration, and since the mold members such as the inner cylinder and plate forming the nozzle are not rotated and the discharged resin is taken in a direction away from the peripheral wall slider, unlike the conventional rotary slider. There is no resin leakage on the surface, and the rotating part can be rotated at high speed to improve molding efficiency.

In addition, since the mesh is formed by parallel striations and spiral striations along the generatrix of the tube, by making the spiral striations thicker or using a high-strength material, it is possible to create a semi-mesh-like tube with reduced diametrical strength. It has the advantage of being able to be continuously molded, and furthermore, it is possible to screw together the spiral stripes formed on the inside and outside of the tube using the spiral stripes, making it extremely easy to connect the tubes. It has excellent effects such as making it easier.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of the nozzle portion, Fig. 3 A is a perspective view of the peripheral wall portion, and Fig. 4 is a perspective view of the peripheral wall portion.
The figure is a developed view of the nozzle portion, FIG. 5 is a partial vertical sectional view of another embodiment, and FIG. 6 is a perspective view of the peripheral wall portion. 1 0, 34... Fixed annular nozzle, 1 6
, 43...Rotating peripheral wall, 17,44.
...notch, 17b, 44b... slope,
18.39...Fixed line nozzle, 20,40.
...Fixed annular nozzle, 22,45...
Parallel striations, 23.46... Cylindrical wall.

Claims (1)

[Claims] 1. Parallel filaments arranged at intervals along the generatrix of the tube;
A cylindrical wall that connects parallel filaments in the circumferential direction within a predetermined center angle range of the tube, and a large number of fixed filament nozzles arranged concentrically with the tube and a fixed filament adjacent to the fixed filament nozzles within the range. While discharging the molten resin from the annular nozzle in the radial direction of the circle, the discharged resin is drawn in the direction of the generatrix line and molded. A synthetic resin half-mesh tube characterized in that the resin discharge part of a fixed annular nozzle that opens in the direction is moved in the circumferential direction, and the discharged resin is separated in a spiral shape and fused to the parallel filaments and the cylindrical wall. Molding method. 2. A large number of fixed line nozzles arranged in a circle and opening in the radial direction, and a number of fixed line nozzles arranged in a predetermined center angle range of the circle, adjacent to the fixed line nozzles, concentric with the circle, and in the same direction as the fixed line nozzles. a fixed annular nozzle that opens, and a fixed nozzle that opens in the same direction as the fixed linear nozzle that is adjacent to both nozzles on the side opposite to the direction in which the discharged resin is taken away parallel to the central axis of each nozzle, that is concentric with the circle, and in the same direction as the fixed linear nozzle. It has an annular nozzle and a rotating circular wall that has a notch and closes the fixed annular nozzle at a part other than the notch, and connects the ejected resin of the fixed annular nozzle to the fixed linear nozzle and the fixed notch at the rear of the cut arrow in the rotational direction. A molding device for a synthetic resin half-mesh tube, characterized in that an annular nozzle is provided with a slanted surface at the front thereof.