JPH0967470A - White belt rubber composition for copying machine and white belt for copying machine using the same - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a white belt rubber composition for a copying machine, which can obtain a belt having a low coefficient of friction with paper and is excellent in processability. A white belt rubber composition for a copying machine containing the following components (A) and (B) as main components. (A) At least one of ethylene-propylene rubber and ethylene-propylene-diene rubber. (B) Isoprene rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white belt rubber composition for a copying machine, which is used as a material for forming a paper feeding belt of a copying machine in an automatic document feeder of a copying machine.

[0002]

2. Description of the Related Art There is a copying machine as shown in FIG. 1 as a copying machine capable of continuously automatically copying a plurality of originals. That is,
In this copying machine 1, a plurality of originals 3 are placed in a stack on an original placing table 2 arranged at the upper end of one side of the main body so that the originals face down, and the original placing cover is placed. 4 is rotated around one edge as shown by an arrow A in the drawing to tilt it on the platen glass 5, and in that state, a switch (not shown) is pressed to operate, so that it is provided on the back surface of the platen cover 4. The white rubber paper feed belt 6 running in the direction of the arrow B conveys the originals 3 placed on the original placing table 2 one by one from the upper side onto the original placing glass 5 each time copying is completed. It is like this. In this case, in response to the copy, the copy paper 8 or 10 housed in the copy paper cassette 7 or 11 is conveyed to the inside of the copying machine 1 and the characters or patterns on the surface of the original 3 are transferred to make a copy. It is sent to the tray 9. In FIG. 1, reference numeral 17 is a storage tray for the originals 3 that have been copied. Such an automatic document feeder of the copying machine 1 is shown in FIG.
As shown in FIG. 2, the rotation of the two drive rollers 12 causes the paper feed belt 6 to travel to convey the original 3, and the number of rotations of the paper feed belt 6 (the number of rotations of the drive roller 12 is counted to determine the paper feed belt 6). Measure the number of rotations of 6)
Is provided at a predetermined position on the platen glass 5. In FIG. 2, 14 is a press roll. Further, in order to simplify the structure and reduce the cost, instead of the method of positioning the stop position by the number of rotations of the paper feed belt 6 as shown in FIG. The method of providing it on the edge of the glass 5 is performed. The paper feed belt 6 needs a frictional force to convey the original document 3 and needs to have the originality of the original document to eject the original document 3.

Materials for forming such a paper feed belt 6 include ethylene-propylene rubber (hereinafter abbreviated as "EPM") and ethylene-propylene-diene rubber (hereinafter "EP").
A rubber composition for a white belt having a main component of "DM" is used.

[0004]

In order to improve the originalness of the paper feed belt obtained by using the above rubber composition, that is, to reduce the friction coefficient of the paper feed belt against paper. Can be achieved by using one having a high ethylene content in the EPM or EPDM. Specifically, the ethylene content in the EPM and EPDM is 65% by weight (hereinafter abbreviated as "%") or more. However, in order to further reduce the friction coefficient with respect to paper, the larger the ethylene content is. The ethylene content is preferably 70% or more, particularly preferably.

However, the above EPM and EPDM are
Originally, since it is a high-viscosity, high-molecular weight polymer, the kneader and roll processability are poor. Moreover, as described above, by increasing the ethylene content, what can be conventionally kneaded in a kneader, during kneader kneading, the rubber slips and the workability deteriorates, or even during roll processing There is a problem that even if they are not put together, even if they are put together, the roll may float, or even if they are divided into sheets, the surface of the sheet feels stiff and stable dimensions cannot be obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a white belt rubber composition for a copying machine, which can obtain a belt having a low friction coefficient with respect to paper and is excellent in processability.

[0007]

In order to achieve the above object, the white rubber belt composition for a copying machine of the present invention is composed of the following components (A) and (B) as main components. (A) At least one of EPM and EPDM. (B) Isoprene rubber.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION That is, the present inventors have used EPM, E used to obtain a belt having a low coefficient of friction with paper.
In PDM, a series of studies were conducted in order to prevent a decrease in processability that occurs when a PDM having a high ethylene content is used. As a result of compounding various compounds for the purpose of improving processability, when isoprene rubber (hereinafter abbreviated as “IR”) is used in combination, the processability of the EPM and EPDM is maintained while maintaining the low friction coefficient with respect to paper. The inventors have found that the reduction is improved to have good workability, and the present invention has been reached.

Particularly, the compounding ratio (A / component) of at least one of the above EPM and EPDM (component A) and IR (component B).
By setting B) in a weight ratio of A / B = 95/5 to 70/30, deterioration of physical properties does not occur, and a remarkable effect of improving workability can be obtained.

In the rubber composition of the present invention,
At least one of ERM and EPDM (A component) and I
A peroxide-based vulcanizing agent is used in consideration of co-crosslinking with R (component B).

Next, the present invention will be described in detail.

The white rubber belt composition for a copying machine of the present invention comprises at least one of EPM and EPDM (component A).
And IR (B component).

The EPM and EPDM are not particularly limited, and conventionally known ones can be used. In particular, from the viewpoint of a low coefficient of friction with paper, it is preferable to use a high ethylene content type. Specifically, the ethylene content is preferably 65% or more, and particularly preferably the ethylene content is 70% or more.

The IR (component B) used together with the above component A brings about an effect of improving the processability of the rubber composition, and in general, IR has a property close to transparency and a white belt forming material is obtained. Also, it is preferable to use IR. Liquid IR is also included in the above IR.

Blending ratio (A / B) of at least one of the EPM and EPDM (component A) and IR (component B)
Is preferably set to A / B = 95/5 to 70/30 by weight ratio, and particularly preferably A / B = 90/10.
８０80/20. That is, the mixing ratio of A component is 9
When it exceeds 5 (B component is less than 5), it is difficult to obtain the effect of improving workability (kneader kneading, roll processability) by IR blending, and conversely, the blending ratio of A component is less than 70 (B component is 30).
If it exceeds, the physical properties will decrease (particularly the elongation will decrease) and the coefficient of friction with paper will increase.

The white belt rubber composition for a copying machine of the present invention contains, in addition to the above-mentioned components A and B, a peroxide vulcanizing agent, a filler, a pigment, a vulcanization accelerator, an antioxidant, a processing aid, and the like. Other additives are appropriately blended.

As the above vulcanizing agent, in the present invention,
From the viewpoint of co-crosslinking at least one of EPM and EPDM with IR, a peroxide-based vulcanizing agent is preferably used. Examples of the peroxide-based vulcanizing agent include dicumyl peroxide, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,1-bis (t-butylperoxy) 3,3,5. -Trimethylcyclohexane,
2,5-dimethyl-2,5-di (t-butylperoxy) hexyne, n-butyl-4,4-bis (t-butylperoxy) valerate and the like can be mentioned. The compounding amount of the vulcanizing agent is preferably set to a ratio of 3.0 to 4.0 parts with respect to 100 parts by weight (hereinafter, abbreviated as “part”) of the total amount of the A component and the B component.

The white belt rubber composition for a copying machine of the present invention is obtained, for example, as follows. That is, it can be obtained by mixing the main components A and B, a peroxide-based vulcanizing agent and other additives in a predetermined ratio, and kneading them with a kneader or the like.

Then, using the above rubber composition, for example,
A white belt for a copying machine having a desired shape can be produced by filling a predetermined molding die and vulcanizing it under vulcanizing conditions of 165 ° C. for 30 minutes.

The white belt for a copying machine thus obtained is manufactured with good workability, and a belt having excellent whiteness can be obtained.

Next, examples will be described together with comparative examples.

[0022]

Examples 1 to 6 and Comparative Examples 1 to 3 The respective components shown in Tables 1 and 2 below were blended in the proportions shown in the same table and kneaded with a kneader to prepare white belt rubber compositions for copying machines. did.

[0023]

[Table 1]

[0024]

[Table 2]

The white belt rubber composition for each copying machine of each Example product and Comparative example product thus obtained was filled in a molding die of a predetermined shape and vulcanized at 165 ° C. for 30 minutes. By doing so, a paper feed belt for the copying machine was produced. Then, the breaking strength and the breaking elongation were measured using this paper feed belt according to JIS K6301. The hardness (JIS A) was measured according to JIS K6301. Further, the whiteness of the belt was measured by a reflection densitometer (Macbeth densitometer RD-9 / 4). Further, the coefficient of friction with paper was measured as follows. That is, as shown in FIG. 4, a sheet (300 mm × 300) made up of the belt for the copying machine, which is an object to be measured, is mounted on a table 26 whose height is adjustable.
mm × thickness 2 mm) 21 and A5 size copy paper 24 was placed on the sheet 21. Further, on the copy paper 24, the weight 20 (weight 200 g, size:
63 mm × 63 mm × thickness 30 mm) was placed. Further, on the other stand 27, a measuring gauge 22 having a movable portion 23 on the bottom surface (Digital Force Gauge manufactured by Imada).
Was prepared, the copying paper 24 and the measuring gauge 22 were connected by a thread 25, and the measuring gauge 22 was moved in the direction of the arrow under a certain condition, and the tensile force (F) during the movement was measured. Using the measured tensile force (F), the friction coefficient (μ) against paper was calculated from the following formula. As the above condition, the pulling speed in the arrow direction was set to 115 mm / min.

[0026]

## EQU1 ## F = μN [In the above formula, N is the weight of the heavy weight 20.] ]

Further, with respect to workability, both kneader kneading and roll workability were evaluated. For evaluation, in the kneader kneading, those that were neatly assembled at the time of discharge were evaluated as ◯, those that were cohesive but slightly in a tattered state were evaluated as Δ, and those that were not together but in a tattered state were evaluated as x. With regard to roll processability, a condition in which workability around the roll is good is ○, a condition in which the roll is slightly floating but a stable size is △, and a stable size is obtained without being wound around the roll. The non-existent state was marked with x. The results of these measurements and evaluations are also shown in Tables 3 to 5 below.

[0028]

[Table 3]

[0029]

[Table 4]

[0030]

[Table 5]

From the results of Tables 3 to 5 above, the mechanical properties, the hardness, the whiteness and the coefficient of friction with the paper of the Examples and Comparative Examples were at the same level. With respect to workability, however, the evaluation results of Comparative Examples 1 and 3 were poor with respect to kneader kneading and roll processability, and the evaluation results of Comparative Example 2 were similar, and poor evaluation results were obtained. On the other hand, in the case of the example product, good evaluation results were obtained in both kneader kneading and roll processability. From this, it can be seen that the example products are excellent in mechanical properties, hardness, whiteness, and friction coefficient against paper, and have improved processability.

[0032]

As described above, the white belt rubber composition for a copying machine of the present invention contains at least one of the EPM and EPDM (component A) and IR (component B) as main components. For this reason, the workability is improved and good workability is maintained while maintaining the low friction coefficient with respect to paper that EPM and EPDM have. Moreover, it is possible to obtain a paper feed belt having excellent whiteness for a copying machine.

Further, the content ratio (A / B) of the above-mentioned A component and B component is A / B = 95/5 to 70/3 in weight ratio.
By setting in the range of 0, deterioration of physical properties does not occur,
A remarkable improvement in workability is realized. Such a white rubber belt composition for a copying machine is co-crosslinked with a peroxide vulcanizing agent to form a white rubber belt. Thus, when the white belt rubber composition for a copying machine of the present invention is used to manufacture a white belt for a copying machine, it is possible to manufacture a white belt having a low friction coefficient with respect to paper with good processability.

[Brief description of drawings]

FIG. 1 is a perspective view of a copying machine.

FIG. 2 is an explanatory diagram showing a document stop method of a conventional automatic document feeder.

FIG. 3 is an explanatory diagram showing a document stopping method of a conventional automatic document feeder.

FIG. 4 is an explanatory diagram showing a method of measuring a friction coefficient with respect to paper.

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[Procedure amendment]

[Submission date] September 28, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Title: White belt rubber composition for copier and white belt for copier using the same

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white belt rubber composition for a copying machine used as a material for forming a paper feeding belt of a copying machine in an automatic document feeding section of a copying machine, and a white belt for a copying machine using the same. .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

The present invention has been made in view of the above circumstances, and a white belt rubber composition for a copying machine which can obtain a belt having a low coefficient of friction with paper and is excellent in processability, and a copying machine using the same The purpose is to provide a white belt.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

In order to achieve the above object, the present invention has as its first gist a white belt rubber composition for a copying machine, which comprises the following components (A) and (B) as main components. A second gist is a white belt for a copying machine, which is formed by using the above-mentioned white belt rubber composition for a copying machine. (A) At least one of EPM and EPDM. (B) Isoprene rubber.

Claims (3)

[Claims] 1. A white belt rubber composition for a copying machine, which comprises the following components (A) and (B) as main components. (A) At least one of ethylene-propylene rubber and ethylene-propylene-diene rubber. (B) Isoprene rubber. 2. The mixing ratio (A / B) of the components (A) and (B) is A / B = 95/5 to 70 by weight.
The white belt rubber composition for a copying machine according to claim 1, which is set to / 30. 3. The white belt rubber composition for a copying machine according to claim 1, wherein a peroxide type vulcanizing agent is blended.