JPH11240634A - Roller formed of different materials and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller formed of different materials and its manufacturing method which meets the performances needed for a paper feeding roller and which enables a low thermal resistant resin to be used for a roller core and which is rubber trouble-free. SOLUTION: With a different material formed roller 1, a roller core 2 is formed from a resin having an ordinary level of heat resistance, and the outer peripheral member 3 provided on the roller core 2 is molded by thermoplastic elastomer. Thus, there is no need for a curing process, the temperature dependency can be reduced, the resin material constituting the roller core 2 does not reqire especially severe heat resistance, and various working processes associated with curing are eliminated. Besides, remainder material, a burr, etc., of the different material formed roller 1, a resin of the roller core 2, and the thermoplastic elastomer of the outer peripheral member 3 can be recycled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dissimilar material forming roll used as a roll with a core for feeding and conveying, and more particularly, to a rubber formed by using a thermoplastic elastomer for an outer peripheral member. In order to avoid the need for the vulcanization step as in the case of using the rubber member, and to avoid contact of the rubber member with the core at a high temperature accompanying the vulcanization step, usually without using a heat-resistant resin as the core, usually BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dissimilar material forming roll which is economically excellent because a resin of a certain level can be employed and has a simplified forming process, and a method for manufacturing the same.

Conventionally, a rubber roll has been used as a paper feed roll or the like.
As shown in FIG. 10, a hole b for inserting a shaft through a disk b is provided in a shaft core to form a rubber roll core d, and a rubber material e is fixed to an outer peripheral surface of the disk b.
That is, the rubber roll a is configured such that the groove f is provided on the outer peripheral surface of the disk b of the rubber roll core d, and the rubber material e is fitted into the groove f. This rubber roll a has holes c
A shaft (not shown) is fixed to the shaft, and a rotating force is transmitted from the driving means to the shaft to rotate the shaft, so that a function as a paper feed roll or the like can be exhibited.

[0003] The rubber roll is provided with a plurality of recesses in the axial direction on the outer peripheral surface of a resin-made rubber roll core, pouring the rubber around it, polishing the surface of the vulcanized rubber after a vulcanization step, and polishing the surface. Some rolls are used for paper feed rolls, etc., with high precision as a roll.

[0004]

However, in the above rubber roll a, after the rubber material e is injected in a molten state into the groove f on the outer peripheral surface of the resin core, it takes 160 to 18 days.
Since a vulcanization step at 0 ° C. for about 4 to 15 minutes is required, a material that can withstand the vulcanization conditions must be adopted for the resin rubber roll core.

Accordingly, as a material of the core for the rubber roll, a resin having excellent heat resistance, for example, 66 nylon resin,
Polybutylene terephthalate, polyacetal resin, polycarbonate resin, and the like must be used, which is significantly more expensive than general-purpose resins. In addition, it is necessary to polish the surface of the rubber roll after vulcanization to increase the accuracy, and polishing powder is discharged during the polishing, and the rubber material such as rubber roll residue and burrs cannot be reused, which is uneconomical. Sex matters.

Accordingly, an object of the present invention is to provide a roll core which can be used for a roll core even if the resin does not satisfy the heat resistance conditions at the time of vulcanization while satisfying the performance required for a paper feed roll or the like. It is an object of the present invention to provide a dissimilar material forming roll free from the above-mentioned inconveniences when a roll is used and a method for producing the same.

[0007]

Means for Solving the Problems The present invention has been proposed to achieve the above object, and has the following structure. That is, according to the present invention, there is provided a dissimilar material forming roll characterized in that a roll core is formed of a thermoplastic resin, and an outer peripheral member provided on the roll core is formed of a thermoplastic elastomer.

Further, according to the present invention, there is provided the above-mentioned two-color forming roll of different materials, wherein the roll core is formed of a general-purpose resin having a heat-resistant temperature of 55 ° C. or higher.

Further, according to the present invention, in a two-color molding die capable of integrally molding an internal member and an external member with the same die, first, a thermoplastic resin is injected to form a roll core portion. After cooling, the roll core is inserted into the mold for the outer peripheral member of the mold, and in that state, a thermoplastic elastomer is injected into the mold for the outer peripheral member to integrate the outer peripheral member with the roll core. A method for manufacturing a dissimilar material forming roll is provided.

According to the dissimilar material forming roll and the method of manufacturing the same provided by the present invention,
Since the time after molding the roll core member is not changed, and the outer peripheral member made of the thermoplastic elastomer is molded on the roll core, the molding process can be simplified, and the vulcanization process is not required for molding the thermoplastic elastomer, It is not necessary to adopt a material having excellent heat resistance, which is expensive as in the past, as the resin material for the roll core, and the cost is economically significant.

Further, by using a thermoplastic elastomer in place of the conventional rubber material, the temperature dependency can be reduced, and not only the strict heat resistance to the roll core is not required, but also various kinds of materials generated during vulcanization. There is also an advantage that the resin of the roll core and the thermoplastic elastomer of the outer peripheral member can be reused, such as the remaining material and burrs of the dissimilar material forming roll.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a dissimilar material forming roll showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line XX of FIG. In the figure, different material forming roll 1
The outer core provided on the roll core 2 is formed by molding the roll core 2 with a general-purpose resin that does not require heat resistance (of course, it can also be molded with a heat resistant resin, but there is no particular advantage in using it). The member 3 is formed by molding a thermoplastic elastomer. The roll core 2 is provided with a hole 5 through which a shaft is inserted into a disk 4 on a shaft core, and a ring-shaped support 6 for supporting and holding the outer peripheral member 3 outside the disk 4.

The roll core 2 is provided with a disk 4 as described above.
Since the hole 5 is formed in the shaft core, a cylindrical portion 10 is formed, and a thin portion 11 extends from the central portion in the axial direction on the outer peripheral surface of the cylindrical portion 10. An annular portion 12 is provided on the outer periphery of the thin portion 11, and the ring-shaped support 6 is provided outside the annular portion 12 concentrically with the cylindrical portion 10.

The outer peripheral member 3 is formed of the roll core 2 after molding.
On the other hand, a thermoplastic elastomer is poured into the ring-shaped support 6 outside the annular portion 12 and molded. Therefore, when the outer peripheral member 3 is provided on the roll core 2, the outer peripheral member 3 is attached to the ring-shaped support 7 outside the annular portion 12.
The outer peripheral member 3 does not move in the axial direction and the circumferential direction of the roll core 2 because the outer peripheral member 3 comes in close contact with the roll core 2. Moreover, since the outer peripheral member 3 is a thermoplastic elastomer, the finishing accuracy after molding is high, and it can be used as a feed roll or the like as it is without any particular adjustment such as polishing. It may be adjusted.

Since a thermoplastic elastomer is used for the outer peripheral member 3, a vulcanizing step is not required unlike the case of rubber material, and therefore, the material of the roll core 2 does not withstand the high temperature conditions in the vulcanizing step. General-purpose resins can be used satisfactorily. The resin that can be used as the resin material of the roll core 2 can be used as long as the general-purpose resin has a heat resistance temperature of usually 55 ° C. or higher, which is a level inherent to a general-purpose resin. The selection of the resin material of the roll core 2 can be determined in consideration of various aspects such as price, strength, durability, and stable supply. Examples of such a resin material include polypropylene (PP), ABS resin, and polystyrene (PS).

The thermoplastic elastomer used for the outer peripheral member 3 is made of a rubber product having elasticity, that is, both a soft segment and a thermoplastic component, that is, a hard segment. Has the same elasticity as vulcanized rubber and plasticizes at high temperatures. Examples of thermoplastic elastomers include polyolefins, polystyrenes, polyurethanes,
There are polyester type, polyamide type, fluorine type, polyvinyl chloride type and the like.

Next, a method for manufacturing the dissimilar material forming roll 1 will be described. First, the roll core 2 having the ring-shaped support 6 outside the annular portion 12 shown in FIGS. That is, as shown in FIG. 5, a resin having a normal level of heat resistance, for example, polypropylene (PP) is injected into the portion A through the passage 21 by the primary injection device 20 in the mold-tightened state, and the roll core 2 is rotated. Is molded. At this time, the secondary injection device 2 is also attached to the roll core 2 in the part B already formed.
In 2, a thermoplastic elastomer, for example, a polyolefin (hereinafter simply referred to as an elastomer) is injected into a portion B through a passage 23 to form the outer peripheral member 3 on the roll core 2. The molding conditions at this time are as follows.
Is a resin temperature of 250 to 260 ° C., a mold temperature of 60 to 80 ° C., and a molding time of 20 to 40 seconds. The outer peripheral member 3 on the secondary side has an elastomer temperature of 170 to 250 ° C., a mold temperature of 50 to 70 ° C., and a molding time of 40 to 60 seconds.

Next, when the cooling of both parts A and B is completed,
As shown in FIG. 6, the mold is opened by the movable platen 24 and
Since the dissimilar material forming roll 1 has been formed on the part, it is removed to form a product, and the roll core 2 of the part A is left as it is, and as shown in FIG.
The part and the part B are exchanged. Then, as shown in FIG. 8, the movable platen 24 is moved to the fixed platen 26 side to set the mold in a tightened state, and then polypropylene is injected from the primary injection device 20 into the portion B to form the roll core 2. Then, since the roll core 2 already formed is formed in the portion A, the outer peripheral member 3 is formed on the roll core 2 by injecting the elastomer from the secondary injection device 22 to the portion A.

The molding conditions at this time are the same as those already described. When the cooling of both the parts A and B is completed, FIG.
As shown in the figure, the mold is opened by the movable platen 24, and since the dissimilar material forming roll 1 has been formed on the part A, it is removed to form a product, and the roll core 2 on the part B is left as it is. Hereinafter, the same operation can be performed to successively form the different material forming rolls 1.

Although the embodiment of the present invention has been described above, the specific configuration is not limited to this, and can be arbitrarily changed, added, or combined without departing from the gist of the present invention.

[0021]

As described in detail above, according to the present invention,
By using a thermoplastic elastomer in place of the rubber material on the core roll surface, the temperature dependence can be reduced, and the need for a vulcanization step does not require severe heat resistance for the roll core. Also, the processing step is unnecessary. Further, the resin of the roll core and the thermoplastic elastomer of the outer peripheral member, such as the residual material of the dissimilar material forming roll and burrs, can be reused. Therefore, although the performance is almost the same as that of the conventional improved rubber roll, even if this is used for a paper feed roll, the paper can be sent stably and reliably, and the range of materials for the roll core can be widened and the resin price is low. Also fall into the options. There is no polishing process for the rubber vulcanized portion, and the manufacturing process is simplified, making it easier to manufacture. Further, conventional rubber rolls cannot reuse rubber materials such as residual materials and burrs, but all of the different material forming rolls can be reused.

[Brief description of the drawings]

FIG. 1 is a side view of a dissimilar material forming roll showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIG. 3 is a side view of a roll core constituting a part of the embodiment of the present invention.

FIG. 4 is a sectional view taken along the line YY of FIG. 3;

FIG. 5 is a partially sectional side view showing a manufacturing state of the dissimilar material forming roll of the present invention.

FIG. 6 is a partially sectional side view showing a manufacturing state of the dissimilar material forming roll of the present invention.

FIG. 7 is a partially sectional side view showing a manufacturing state of the dissimilar material forming roll of the present invention.

FIG. 8 is a partially sectional side view showing a manufacturing state of the dissimilar material forming roll of the present invention.

FIG. 9 is a perspective view showing a conventional example.

FIG. 10 is a sectional view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 dissimilar material forming roll 2 roll core 3 outer peripheral member 4, b disk 5, c hole 6 ring-shaped support 10 cylindrical portion 11 thin portion 12 annular portion 20 primary-side injection device 21, 23 passage 22 secondary-side injection device 24 movable Platen 25 Mold reversing device 26 Fixed platen a Rubber roll d Rubber roll core e Rubber material f Groove

Claims (3)

[Claims] 1. A dissimilar material forming roll, wherein a roll core is formed of a thermoplastic resin, and an outer peripheral member provided on the roll core is formed of a thermoplastic elastomer. 2. The roll core is formed of a general-purpose resin having a heat-resistant temperature of 55 ° C. or higher.
A two-color forming roll of a different material as described. 3. In a two-color molding die capable of integrally molding an internal member and an external member with the same die, first, a thermoplastic resin is injected to form a roll core portion, which is then cooled. The roll core is inserted into a mold for an outer peripheral member of the mold, and in that state, a thermoplastic elastomer is injected into the mold for the outer peripheral member, and the outer peripheral member is integrated with the roll core. Production method.