JPH0563290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for processing artificial turf laid on the floor of a balcony or the like.

<Prior art> As shown in Japanese Patent Publication No. 52-1569,
Artificial turf having columnar projections formed by dividing a cylinder in the axial direction is known.

<Problems to be Solved by the Invention> However, in the above-mentioned artificial turf, rolls or reciprocating plates are used to bend the tip of each protrusion, so the bending direction is irregular and the appearance is poor. It was hot.

<Means for Solving the Problems> The present invention provides artificial turf in which columnar protrusions, each of which is a cylinder divided in the axial direction, are arranged side by side on the upper surface of a substrate, and a substantially conical heating element is inserted into the cylinder. The above-mentioned problem is solved by heating and softening the protrusions, pressing downward to bend each protrusion radially outward, and then cooling the protrusions in the pressed state.

Example 1 Made of low-density polyethylene with MI=7 and a Vikat softening point of 104°C, a height of 25 mm and a thickness of
Artificial turf is molded by injection molding, in which 100 columnar protrusions 12 are formed by dividing a cylinder with a diameter of 0.8 mm and an outer diameter of 7 mm into eight equal parts in the axial direction, 100 of which are lined up per meter, and protruding into the mold 2 are provided in the cylinder. Tip diameter: 4mm, base diameter: 9mm
mm, height 14 mm approximately conical heating body 21 is attached to columnar projection 1.
The mold 2 and the substrate 11 are inserted so that the tip of the mold 2 touches the base of the heating element 21 and heated at 120°C for 30 seconds.
After applying pressure downward for 10 seconds so that the distance between
It was cooled to 40°C or less while being pressed to a thickness of mm.

In this way, when the artificial turf cooling process is performed using a separate cooling type, there is no loss of thermal energy and productivity is improved.

The tip of the columnar process curled outward in a radial pattern, was approximately 19 mm in height, had a good feel to the foot, and had a good appearance.

Example 2 90 parts of low density polyethylene with MI=7, Vikatsu softening point 95°C and vinyl acetate content with MI=7
A mixture of 10 parts of 15% ethylene/vinyl acetate copolymer was used to coat the top surface of the substrate 11 with a height of 16 mm and a thickness of 0.8 mm.
Columnar protrusion 1 made by dividing a cylinder with an outer diameter of 7 mm into 8 equal parts in the axial direction
2, 100 rows per 1 m of artificial turf are molded by injection molding, and the cylindrical center is provided with a diameter of 3 mm at the tip, a diameter of 8 mm at the base, and a height of 7 mm, which is protruded from the mold 2. Insert the conical heating element 21 to such an extent that the tip of the columnar projection 12 touches the base of the heating element 21, and
After heating at ℃ for 30 seconds, the distance between mold 2 and substrate 11 is
After applying pressure downward for 10 seconds to a depth of 10 mm, take it out.
It was cooled to 40° C. or lower while being pressed with a flat mold so that the distance from the substrate was 10 mm. The tip of the columnar process was bent outward radially and approximately horizontally, and was sturdy and good-looking.

The inclination angle of the approximately conical heating element is 5° or more, preferably
It is preferable that the angle be 10° or more, and that the base should be arcuate.

<Effects of the Invention> As described above, the present invention heats and softens the columnar protrusions using a substantially conical heating element and then presses them downward, so the heating rate is fast and a good view can be obtained in a short time. You can get artificial grass.

In addition, by bending each protrusion radially outward and then cooling it while being pressed, the tips of the columnar protrusions that have been bent radially outward will not return to their original state in pieces. , artificial turf that is regularly bent in a radial pattern and has a good appearance can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the processing method of the present invention;
FIG. 2 is a perspective view showing artificial turf before being processed by the method of the present invention. 11: Substrate, 12: Columnar projection, 21: Heating body.

Claims (1)

[Claims] 1. In artificial turf in which columnar projections formed by dividing a cylinder in the axial direction are arranged side by side on the upper surface of the substrate, a substantially conical heating element is inserted into the cylinder to heat and soften the projections, and then pressed downward, A method for processing artificial turf, which comprises bending each protrusion radially outward and then cooling it while being pressed.