JPH05330846A - Blade bearing roll for cutting glass fiber - Google Patents

Abstract

PURPOSE:To improve chip cutting resistance and wear resistance by eliminating the stains in the case this blade bearing roll is used for plastic products. CONSTITUTION:The blade bearing rubber layer 3 of the blade bearing roll 1 is constituted of rubber which does not contain a carbon black. Then, the generation of the stains is obviated even if the cut short fibers 5 are used for the plastic products. This rubber layer 3 contains 5 to 30vol.% short fibers and oriented with the short fibers at 50% orientation rate in a radial direction. The chip cutting resistance and wear resistance are, therefore, excellent and the rubber scrap by the blade bearing rubber layer 3 is hardly generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade receiving roll for cutting glass fibers.

[0002]

2. Description of the Related Art Conventionally, short fibers obtained by cutting fibers have been widely used as a reinforcing material for various plastic products and a raw material for various sheet products.

In a device for forming such short fibers by cutting, a cutting blade roll and a blade receiving roll are arranged so as to face each other, and the cutting blade of the cutting blade roll is pressed against the blade receiving rubber layer of the blade receiving roll. , The fibers are cut to form short fibers.

[0004]

[Problems to be Solved by the Invention]
During the fiber cutting work, a large amount of rubber scraps produced by cutting the blades will be mixed into the cut short fibers.Therefore, if the cut short fibers are used as they are for various plastic products, they will be contaminated by the rubber scraps. However, there is a problem that the electric characteristics such as electric insulation are deteriorated. In particular, recently, the demands on the quality of these plastic products have become more stringent, and it goes without saying that they have high mechanical properties, and there are no defects in electrical insulation, dirt, etc., and a good finished appearance is required. However, it is the current situation that we cannot deal with this. Further, since the cutting blades of the cutting blade roll are pressed against each other, the life of the blade receiving roll is short and it is necessary to replace the blade receiving roll frequently.

Therefore, the hardness and shape of the blade receiving rubber layer of the blade receiving roll and the structure and shape of the cutting blade roll have been improved, but they have not been sufficient.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a cutting blade of a cutting blade roll having an outer rubber layer on the outer periphery of a core metal, the outer rubber layer cutting the glass fiber when cutting the glass fiber. Assuming that the glass fiber cutting blade receiving roll is to be received, the outer rubber layer is made to contain a carbon black-free rubber in a proportion of 5 to 30% by volume of short fibers, and the short fibers are 50 in the radial direction of the roll. The orientation is such that the orientation rate is at least%.

As the short fibers used here, organic fibers having excellent impact resistance, such as nylon fibers, polyester fibers, cotton fibers, cellulose fibers, aromatic polyamide (aramid) fibers, aromatic polyester fibers, etc. are particularly suitable. . The reason why the filling rate of the short fibers is 5 to 30% by volume is that the effect is small at less than 5% by volume and the processing of the product becomes difficult at more than 30% by volume.

The short fiber may be oriented in the roll radial direction, the roll circumferential direction, and the roll axial direction. The orientation in the roll radial direction is the most excellent in chip cutting resistance, and in that case, 50% or more. It is desirable that the short fibers be oriented in the radial direction of the roll with the orientation ratio of.

[0009]

When the short fiber is cut using the blade receiving roll according to the present invention, since the outer rubber layer does not contain carbon black, there is a possibility that the cut short fiber may be contaminated in the plastic product. Absent. Further, in the outer rubber layer, since the short fibers are oriented in the roll radial direction, the chip cut resistance is improved, and almost no rubber waste is generated during the cutting operation of the short fibers.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In FIG. 1, which shows the schematic construction of an apparatus for cutting glass fibers, 1 is a glass fiber cutting blade receiving roll, which has a blade receiving rubber layer 3 on the outer periphery of a core metal 2. The glass fiber thread 4 is cut into the blade receiving rubber layer 3 to cut the short fiber 5
The cutting blades 7 of the cutting blade roll 6 that form the above are pressed against each other.

Reference numeral 8 denotes a glass fiber thread roll, from which the glass fiber thread 4 fed at a constant speed passes between the blade receiving rubber layer 3 of the blade receiving roller 1 and the cutting blade roller 6 via the intermediate roller 9. As the cutting blade 7 of the cutting blade roll 6 is pressed against the blade receiving rubber layer 3 of the blade receiving roll 1 when passing through, the glass fiber thread 4 is cut into short fibers 5, which are collected through the hopper 10. Is configured.

The blade receiving rubber layer 3 is formed by adding 5 to 30% by volume of short fibers 5 to rubber containing no carbon black, and orienting the short fibers 5 in the roll radial direction with an orientation rate of 50% or more. Composed of short fiber composite rubber. The length of the short fibers 5 is preferably 6 mm or less from the viewpoint of easy kneading with rubber.

Next, the test performed on the blade receiving roll will be described.

NR (RSS # 3) 100 parts by weight Silica (Nipsin WN3) 40 Procell oil (Sonic R50) 7 Titanium oxide 10 Zinc white 3 5 Stearic acid 2 Anti-aging agent SP 3 Si69 1.5 Sulfur 2.2 Addition Sulfurization accelerator CZ 0.6 First, after kneading the NR matrix rubber with the above rubber compounding, 15% by volume of polyester short fibers (diameter 15 μm, length 2.2 mm) was mixed into the NR matrix rubber, It was thoroughly dispersed, thereby preparing an unvulcanized kneaded product of rubber containing short fibers.

The kneaded material thus obtained was extruded and vulcanized to prepare blade receiving rolls having three kinds of fiber orientations shown in Table 1. The vulcanization conditions at this time are 140 ° C.
× 40 minutes. The diameter of the roll is 250 mm, the thickness of the blade receiving rubber layer is 30 mm, and the length is 250 mm.

[0017]

[Table 1] Further, Comparative Example 3 which is a rubber roll consisting only of the matrix rubber and Comparative Example 4 which is a polyurethane roll having the following composition were prepared.

Polyurethane adipate 100 parts by weight 1,5 naphthalene-diisocyanate 15 1,4 butanediol 25 1,1,1 trimethylolpropane 0.5 Using the blade receiving roll thus obtained, a glass fiber yarn The cutting was performed for 4 hours, and the thickness of the blade-receiving rubber layer worn at that time was measured. The results obtained are shown in Table 2.

[0019]

[Table 2] From the test results, it is understood that the wear amount is reduced and the durability is improved by using the short fiber composite rubber for the blade receiving rubber layer. In particular, when the short fibers are oriented in the radial direction of the roll, the wear amount is further smaller than that of the urethane roll having excellent wear resistance.

According to the above construction, when the glass fiber is cut to form the short fiber, less rubber scraps are produced by the blade cutting than the blade receiving rubber layer 3 of the blade receiving roller 1, and therefore, Even if the cut short fibers 5 are used as they are for various plastic products, no stain is generated, and in the blade receiving rubber layer 3, since the short fibers 5 are oriented in the roll radial direction, chip cutting resistance, The wear resistance is improved, and as a result, the durability is improved, and the replacement life is greatly extended.

[0021]

Since the present invention is constructed as described above,
When used to cut the short fibers, the outer rubber layer does not contain carbon black, so even if the cut short fibers are used in a plastic product, there is no concern that the plastic product will be contaminated. Further, in the outer rubber layer, since the short fibers are oriented in the roll radial direction, the chip cut resistance is improved, and almost no rubber waste is generated during the cutting operation of the short fibers.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an apparatus using a glass fiber cutting blade receiving roll.

[Explanation of symbols]

 1 Glass fiber cutting blade receiving roll 2 Core metal 3 Blade receiving rubber layer (outer rubber layer) 4 Glass fiber thread 5 Short fiber 6 Cutting blade roll 7 Cutting blade

Claims (1)

[Claims] 1. A glass fiber cutting blade receiving roll that has an outer rubber layer on the outer periphery of a core metal, and the outer rubber layer receives a cutting blade of a cutting blade roll that cuts the glass fiber when cutting the glass fiber. In the outer rubber layer, the short fibers are contained in a ratio of 5 to 30% by volume with respect to the rubber containing no carbon black, and the short fibers have an orientation rate of 50% or more in the roll radial direction. A blade receiving roll for glass fiber cutting characterized by being oriented.