JPS6215375A - Method for infiltrating plastic in synthetic fiber net to coat the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a method of impregnating and coating a synthetic fiber net with plastic, and in particular, a method of impregnating plastic to the inside sufficiently and uniformly covering the surface. This invention relates to a method of impregnating and covering a synthetic fiber net with plastic, which allows a sufficient thread pattern to be produced at the same time as the covering.

(b) Conventional technology Synthetic fiber nets used for tennis, volleyball, etc.
The material is impregnated with plastic and coated to prevent it from becoming unsightly due to the tension being applied to different parts when it is strung up for play, and to prevent it from wearing out or becoming brittle after long-term use. There is.

Conventionally, such nets have been manufactured by various methods, but one example is a method comprising the following steps.

The method consists of a first step of depositing liquid plastic on the first roll onto a synthetic fiber net passing from one to the other over a plurality of rolls, and onto the synthetic fiber net on the top of the next roll or rolls. A second step in which the lower end of the elastic plate is applied and at the same time a blade-shaped plate at the tip is applied to the roll surface at the bottom to remove an appropriate amount of liquid plastic, and a third step in which the synthetic fiber net that has passed through the second step is widened. The fourth step consisted of heating the tentered synthetic fiber net to harden the liquid plastic impregnated and covering the surface.

(c) Problems to be solved by the invention Nets used for tennis, volleyball, etc. are generally thicker in the vertical direction (i.e. in the direction of progress of the process) due to the process of making them into nets. , is narrower in the horizontal direction.

Therefore, as in the second step of the conventional method described above, when removing excess liquid plastic that has adhered to the synthetic fiber net at the top of one or more rolls using an elastic plate, a thick longitudinal net will remove the excess liquid that has adhered to the synthetic fiber net. Most of the liquid plastic was removed, and on the other hand, the thin horizontal mesh was obstructed by the thick vertical mesh, and the lower end of the elastic plate could not go down as desired, resulting in more liquid plastic than necessary adhering to it. Therefore, the plastic cannot be uniformly coated on the surface of the synthetic fiber net, and as a result, the thread pattern of the longitudinal rope is exposed as it is, and the thread pattern of the horizontal rope is completely exposed, resulting in a very poor appearance. In addition, the liquid plastic cannot sufficiently penetrate into the inside of the net in both the vertical and horizontal directions, preventing wear and embrittlement during long-term use. The effect was small.

The present invention aims to eliminate the above-mentioned drawbacks of the conventional method of impregnating and coating a synthetic fiber net with plastic.

(d) Method for solving the problem In order to achieve the above-mentioned objects, the present invention provides a synthetic fiber net that passes over multiple rolls from one side to the other, with liquid plastic being deposited on the first roll. The first step is to apply an appropriate amount of air to the synthetic fiber net at the top of one or more rolls, and at the same time apply a cutting edge plate to the roll surface at the bottom to remove an appropriate amount of liquid plastic. 2 steps, a 3rd step of tentering the synthetic fiber net that has undergone the second step, and heating the tentered synthetic fiber net,
The present invention provides a method for impregnating and coating a synthetic fiber net with plastic, which comprises a fourth step of curing the liquid plastic impregnated and coating the surface of the synthetic fiber net.

(E) Function The present invention provides an appropriate amount of air in the second step, in which an appropriate amount of air is applied to the liquid plastic adhering to the entire surface of the synthetic fiber net over the entire width of the synthetic fiber net at the top of the single or plural rolls. Approximately the same amount of air acts on both the thick mesh in the vertical direction and the thin mesh in the horizontal direction, and the same amount of liquid plastic is transferred to the contacting roll surface, and at the same time, liquid plastic is transferred to the mesh in both directions. Penetrates well. Therefore, the plastic is coated on the surface of the synthetic fiber net with a uniform thickness,
Also, the inside is sufficiently impregnated. Moreover, the thickness of the plastic coated on the body surface can be adjusted appropriately by changing the speed of the air, so it can be freely adjusted to the desired thickness, and the thread pattern can be clearly defined on the entire surface. .

(F) Example The drawing is a schematic side view illustrating the method of impregnating and coating the vinylidene chloride net of the present invention with vinyl chloride.

Guide vinylidene chloride net (1) (diameter 8 mm) (
2-1), (2-2), proceed in the direction of arrow (3) at a speed of 1.5 m/min, and roll the first roll (diameter 350 va).
m) Contact (4). On this roll (4), the following polyvinyl chloride (
Plastisol (5) (copolymerized with vinyl acetate of 202 was used to lower the gelling temperature) is allowed to fall over the entire width.

Polyvinyl chloride (degree of polymerization 800) 100 parts by weight Plasticizer DOP 85 Calcium carbonate 40 Stabilizer (zinc-barium complex) 3~Blowing agent (azodicarbon 7miF)
1 Foaming aid
0.5 Viscosity 30.000 CPS
(at 25℃, the same applies hereafter) The viscosity is usually 20.00
0 CP5~40.000 CPS is used,
If the viscosity is smaller than this, the resulting net will have no elasticity, and if it is larger than this, the net will have elasticity, but it will be difficult to penetrate into the inside of the net that makes up the net. The purpose of using the foaming agent was to add flexibility without compromising the stiffness, making it easier to handle during tensioning, etc.

Next, four rolls (diameter 300 mm) arranged at a distance of about 2 m (6-1), (6-2), (
6-3), At the top of (6-4), 4.
5m'/min, 3.5m3/min, 2m37min, 1.6m'
/min air volume (7-1), (7-2), (7
-3), (7-4), and at the same time each of the above four rolls (6-1), (6-2), (6-3)
, (6-4) has a blade-shaped metal plate (8-1) at the bottom,
(8-2), (8-3), (8-4) sequentially 0.5mm, 0.4ms+, 0゜2mm, Omm
Apply with a gap of

At this time, the excess polyvinyl chloride plastisol (5) adhering to the surface of the net (1) due to the above-mentioned wind spreads to the rolls (6-1), (6-2), (6-3).
, (6-4) It is transferred to the surface and adheres to the surface of all the ropes constituting the net (1) with a uniform thickness, and at the same time sufficiently penetrates into the inside of the net. Moreover, the roll (6-1),
(6-2), (6-3), (6-4) The polyvinyl chloride plastisol (5) attached to the surface of the blade-shaped metal plate (8-1), (8-2), (8 -3
), scraped off by (8-4). Although it is omitted in the drawing, the polyvinyl chloride plastisol (5) that was scraped off and fell to the bottom is collected and removed from the first roll (
4) moved on and reused.

What you must be careful about at this time is that if you completely scrape off this polyvinyl chloride plastisol (5), the amount of polyvinyl chloride plastisol (5) on the back of the net (1) will decrease. .

Therefore, the tip blade-shaped metal plate (8-1), (8-2)
, (8-3).

(8-4) and roll (6-1), (6-2),
(6-3), (6-4) Adjust the gap with the surface as appropriate, and roll (6-1), (6-2), (6-3)
.

(6-4) The amount of polyvinyl chloride plastisol transferred to the surface must be controlled.

In this example, the rolls are (6-1) and (6
-2).

(6-3) and (6-4) are used as an example, but other numbers may be used, and the air volume and
The gap between the roll surface and the tip blade plate is adjusted as appropriate.

Finally, the net (1) treated in this way is sufficiently tentered by a tenter (9), and then heated at a heating device (length 6 m) at a temperature of 155 ± 3° C. αψ
Polyvinyl chloride plastisol (1)
was converted into a kegel to obtain a net, which is the intended object of the present invention.

(G) Effects of the Invention The net obtained as described above had a good appearance because the entire surface was covered with polyvinyl chloride with a thickness of about 1 to 2 mm, and the thread pattern was sufficiently exposed. Moreover, the inside was also impregnated with a sufficient amount of polyvinyl chloride, giving the net sufficient stiffness.

[Brief explanation of the drawing]

The drawing is a schematic side view for explaining the invention in detail. 1 - net, 2 - guide, 3 - traveling direction of net (1), 4 - first roll, 5 - polyvinyl chloride plastisol, 6 - roll arranged next to first roll (4),
7-Air, 8-Tip blade plate, 9-Tendering machine, 10-Heating device.

Claims (1)

[Claims] A first step of depositing liquid plastic on the first roll of the synthetic fiber net that moves from one side to the other over a plurality of rolls, and applying an appropriate amount of air to the synthetic fiber net on the top of the next roll or rolls. , and at the same time remove an appropriate amount of liquid plastic by applying a cutting edge plate to the roll surface at the bottom, and a third step of tentering out the synthetic fiber net that has passed through the second step. A method for impregnating and covering a synthetic fiber net with plastic, comprising a fourth step of heating the synthetic fiber net to harden the liquid plastic impregnated and covering the surface.