JPS6221513A - Manufacture of netted sheet made of synthetic resin - Google Patents

Abstract

PURPOSE:To perform extrusion molding of a netted sheet continuously, by a method wherein molten resin in the inside of an extrusion machine is pressed in a stripe groove of a mesh on the external circumferential surface of a revolving roll, the molten resin is led outward of a mold by making the revolving roll revolve, cooled by bringing the same into contact with a cooling roll and peeled off from the revolving roll. CONSTITUTION:Molten resin 5 is fed to a resin passage 13 of a mold 1 with pressure through the inside of an extrusion machine, extruded in a sheetlike state from a resin discharge outlet 12 through a manifold 15 and pressed in a stripe groove 21 of the external circumferential surface of a revolving roll 2. In this instance, the revolving roll 2 is being revolved in harmony with a discharge quantity of the resin of the extrusion machine and the molten resin 5 is pressed in the stripe groove 21 in a revolving direction of the revolving roll 2 in order, in a land part 14 of a recessed part 11 of the mold 1. Then the molten resin 5 of the inside of the stripe groove 21 is led outward of the mold 1 in order according to a revolution of the revolving roll 2 and cooled by bringing the same into contact with a cooling roll 3. Then cooled resin 5' of the inside of the stripe groove 21 is peeled off in order from the revolving roll 2 through the cooling roll 3 and a peeling roll 4 and received. In sucession to the above, cooled resin 5', that is, a netted sheet may be appropriately oriented monoaxially or biaxially.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a synthetic resin net sheet.

(Prior Art and Problems to be Solved by the Invention) Conventionally, as a method for manufacturing a net-like sheet made of synthetic resin, for example, Japanese Patent Publication No. 42-6029 discloses that one side of a thermoplastic resin sheet having a uniform thickness or A method is described in which a large number of recesses of a certain size are provided at regular intervals on both sides, and the sheet is stretched lengthwise and laterally to form openings at the positions of the recesses. However, in this method, after the -H sheet is produced, it is embossed and further stretched, so the manufacturing process is complicated, and it is difficult to make the openings, that is, the shape of the mesh, uniform, and the product rK surface is uneven and windy. There are problems such as poor performance.

In addition, in the 4th official publication No. 59-24670fl, thermoplastic STMI is extruded from a rotating die of an extruder light type to form a group of double inner and outer threads lined up in a cylindrical shape, and the threads are made by rotating the rotating die. Cross them and weld the intersections to form a cylindrical mesh t-f.
f of the net made by manufacturing v and opening this cylindrical net by 17J to make a flat net.
! The II manufacturing method has been softened by 1. However, this method has a problem in that the cylindrical mesh is cut open after the cylindrical mesh is produced, and therefore the manufacturing process is time-consuming. Unfortunately, since the threads are intersected by the rotation of a rotating die, there is a problem in that only four-sided meshes can be manufactured.

(Means for Solving the Problems) The Four Parties have resolved the above-mentioned problems as a result of intensive research into the problems of the conventional technology, and also provide a method for producing net cane sheets made of apricot resin. It is.

Hereinafter, the invention will be explained with reference to the drawings.

In the drawing, (1) is a mold, which is attached to the tip #A of a general-purpose extruder for synthetic resins. Mold (11 is I
ff along the width direction [! ! A resin passage (11) is provided inside so that a resin discharge port +121 opens in the recess (11). Since it is provided with one side of the surface, the recess (II) generally has an arcuate cross section along the outer circumferential surface of the rotating roll (2) as shown in FIG. The cross section does not have to be arcuate, and at least the inner surface of the fourth part (11) along the rotation direction of the rotating roll (2) from the fat-retaining outlet 02), that is, the land part θ4) is along the outer circumferential surface of the rotating roll (2). It is curved in a circular arc and has a good angle.Also, it is a manifold provided at the 05) H411 discharge port 021.

The rotating roll (2) has, for example, mesh lines tI4 and 1 cut in its outer peripheral surface as shown in FIG. Rotating roll (2) N
(Left below) As shown in Figure 1, the outer peripheral surface is the recess (II) of the mold
At least the land part 0 of the mold +1)
It is designed to be in sliding contact with Xun. Further, the strip #11m1 may be provided so that the mesh has an appropriate shape such as a circle, an oval, a square, or a polygon. Furthermore, rotating roll ill i
The extruder is rotated by a drive device such as I7 in synchronization with the amount of resin discharged from the extruder.

13) is a cooling roll, and one or more cooling rolls are provided in front of the mold II) so as to be in contact with the rotating roll (2). Cooling roll +31 t-4 rotating roll (
! ) rotates with the rotation of.

(4) A peeling roll, which is provided in front of the rotating roll (2) and is arranged to face one of the cooling rolls (3) as shown in FIG.

16) i! a molten resin, (6) a cooled resin,
It is a synthetic resin that has a reticulated shape, and is made of polyethylene,
Thermoplastic resins such as polypropylene and polyvinyl chloride are used.

Next, the manufacturing method of the present invention will be sequentially explained with reference to FIG.

S- First, the molten resin (5) is fed under pressure from inside the extruder to the resin passage 01 of the mold (1), and then passed through the manifold to the resin discharge port 6.
The sheet is extruded from the trout and is press-fitted into the grooves on the outer peripheral surface of the rotating roll (2). At this time, the rotating roll (ri) is rotating in synchronization with the resin discharge amount of the extruder, and the mold (
The rotating roll (
The molten resin film is sequentially press-fitted into the grooves in the direction of rotation. Next, the rotating roll (the molten resin body in the groove as the roller rotates) is sequentially guided to the outside of the mold (1), and cooled by contacting with the cooling roll (31). cooling resin +il'& cooling roll (1) and peeling roll (
4), it is sequentially peeled off from the rotating roll (2) and taken off.

Further, after coloring, the above-mentioned cooling resin (pass, that is, the net-like sheet may be stretched as appropriate by axial or two-wheel stretching).

As described above, by using the manufacturing method of the present invention, the mesh sheet 711 having a circular or square mesh as shown in FIGS.
1.

(Effects of the Invention) As detailed above, the production method of the present invention involves press-fitting the molten resin in the extruder into the grooves of the mesh on the outer circumferential surface of the rotating roll.
The molten resin in the grooves is guided sequentially from the mold recess to the outside of the mold by rotating the groove, and is cooled by contact with the cooling roll, and the resin in the groove is sequentially peeled off from the rotating roll. Can be extruded into a reticulated sheet, making manufacturing time-consuming.

In addition, since the molten resin is press-fitted into the grooves of the mesh on the outer peripheral surface of the rotating roll, it is easy to continuously form a mesh sheet having meshes of various shapes using the rotating roll having grooves of the mesh of various shapes. can be manufactured. Moreover, since the outer circumferential surface of the rotating roll comes into sliding contact with the inner surface of the mold recess extending from the resin discharge port at least in the direction of rotation, it is possible to easily produce a reticulated sheet with a uniform thickness and a well-defined mesh. be able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a manufacturing process apparatus in the manufacturing method of the present invention, FIG. 2 is a partially cutaway front view showing an embodiment of a rotating roll in the manufacturing method of the present invention, and FIGS. 3 and 4 are respectively It is a partially cutaway perspective view showing an example of a reticulated sheet manufactured by the manufacturing method. l... Mold, 11... Concavity, 12... Resin discharge port, 13... Resin passage, 14... Land portion, 15...
・Manihole, 2... rotating roll, 21... groove,
3... Cooling roll, 4... Hull separation roll, 5... Molten resin, 5'... Cooling resin, 6... Reticular sheet, 6
1...mesh.

Claims (1)

[Claims] 1) A resin discharge port is opened in a recess provided along the width direction of the mold on the front surface of the mold at the tip of the extruder, and a rotating roll having a mesh groove on its outer peripheral surface faces the recess. The outer circumferential surface of the rotary roll is in sliding contact with the inner surface of the recess extending from the resin discharge port at least in the direction of rotation, and a cooling roll in contact with the rotary roll is provided in front of the mold. The molten resin is extruded into a sheet form from the resin discharge port and is press-fitted into the grooves on the outer circumferential surface of the rotating roll.
A mesh made of synthetic resin that rotates a rotating roll to guide the molten resin in the grooves from the mold recess to the outside of the mold, cools it by contacting a cooling roll, and sequentially peels the resin in the grooves from the rotating roll. Method of manufacturing sheets.