JPH0760758A - Method for continuously vulcanizing rubber sheet - Google Patents

Abstract

PURPOSE:To perform continuous vulcanization of a continuous-length rubber sheet using a short-length press, eliminate a preparation operation for previously cutting a continuouslength unvulcanized rubber sheet into a predetermined length, eliminate the use of a duralumin caul to eliminate a toublesome operation, such as the loading/ unloading of the caul and the application of a cooling agent and a releasant, and prevent occurrence of irregularities in a heating boundary part. CONSTITUTION:When a continuous-length unvulcanized rubber sheet Sa is intermittently fed forward by the length of a hot platen from one side of hot platens 11, 12 of a short-length press 10 to the opposite side through between the upper and lower platens, continuous-length release sheets 17 are overlapped on the upper and lower surfaces of the continuous-length unvulcanized rubber sheet Sa on one side of the hot platens. The continuous-length unvulcanized rubber sheet Sa is transported by the release sheets 17. Next, the continuous-length unvulcanized rubber sheet Sa is heated for a predetermined time together with the upper and lower release sheets 17 between the upper and lower hot platens. Thereafter, the upper and lower release sheets 17 are released on the opposite side of the hot platens 11, 12. The release sheets 17, 17 and the vulcanized rubber sheet Sb are taken up individually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously vulcanizing a long rubber sheet using a short press having a press length of several meters or less.

[0002]

2. Description of the Related Art The following method is known as a method for vulcanizing a long rubber sheet using a short press.
As shown in FIG. 5, a press machine 10 including a lower heating plate 11 that moves up and down downward and an upper heating plate 12 fixed above the lower heating plate 11.
A front table 3 and a rear table 4 are installed in front of (on the left side of the figure) and behind, respectively, and a lower backing plate 5 made of duralumin is placed on the lower heating plate 11 and is not added to the lower backing plate 5. The vulcanized rubber sheet Sa is spread, the winding roll (unvulcanized winding roll) Ra of the unvulcanized rubber sheet Sa is provided at the front end (left end in the figure) of the lower backing plate 5, and the vulcanized rubber sheet Sb is provided at the rear end. A winding roll (vulcanization winding roll) Rb is placed.

When the lower heating plate 11 is raised in this state and press vulcanization for a predetermined time is completed, the lower heating plate 11 is lowered, the lower backing plate 5 is pulled out onto the rear table 4, and the upper backing plate 6 is pulled out. Remove vulcanization roll R (see Fig. 6)
b is rolled forward as indicated by arrow P, and the rubber sheet Sb vulcanized by the above press is wound up. Next, both the unvulcanized winding roll Ra and the vulcanized winding roll Rb having a diameter increased by rolling are moved to the rear end of the lower backing plate 5,
Then, the unvulcanized winding roll Ra is rolled forward to extend the unvulcanized rubber sheet Sa for one press on the lower patch plate 5, and the upper patch plate 6 is placed on the unvulcanized rubber sheet Sa. Then, the lower backing plate 5 is again attached to the lower heating plate 11
The lower hot platen 11 is pulled upward and vulcanized by raising it, and thereafter, by repeating this process, the long unvulcanized rubber sheet Sa is vulcanized over the entire length. In addition, at the time of the first press, the lower backing plate 5 is placed on the front table 3, the unvulcanized winding roll Ra is placed at the rear end, and this is rolled forward,
The unvulcanized rubber sheet Sa for one press is spread.

[0004]

According to the above-mentioned conventional method, an unvulcanized rubber sheet Sa having a predetermined length is wound into a roll, placed on the lower backing plate 5, and the press 1 is pressed on the lower backing plate 5.
Since the vulcanized rubber sheet Sb is wound in a roll shape every time, it is necessary to cut a long unvulcanized rubber sheet into a predetermined length, for example, every 10 m, and wind it in a roll shape. . In addition, the lower backing plate 5 is put into and taken out from between the upper and lower heating plates 11 and 12 for each pressing, the upper backing plate 6 is attached and detached, and the vulcanized rubber sheet Sb on the lower backing plate 5 is attached.
And the heavy and long winding rolls Ra and Rb are manually moved from the front end to the rear end of the lower backing plate 5, and the above backing plate needs to be cooled to lower the thermal efficiency. And the rubber sheet S of the backing plates 5 and 6
The release agent had to be applied to the surface where a and Sb were in contact with each press, resulting in extremely low efficiency.

Further, in order to prevent the boundary portion (burning boundary portion) of the portion vulcanized by pressing two times before and after from being over-vulcanized, each of the front ends of the lower heating plate 11 and the upper heating plate 12 is provided. Forming slopes 11a and slopes 12a (see FIG. 5),
The slopes 11a and 12a are cooled during the pressing, but if this is done, the pressing pressure of the portion facing the slopes 11a and 12a will be insufficient during the previous vulcanization, and this portion will be semi-vulcanized. Therefore, there is a problem that the semi-vulcanized portion is damaged when the upper backing plate 6 is peeled off, and the thickness unevenness occurs at the above-mentioned burning boundary portion due to the insufficient pressing pressure.

The present invention eliminates the need for preparatory work for cutting a long unvulcanized rubber sheet into a predetermined length when vulcanizing a long rubber sheet using the above short press machine. In addition, the use of a duralumin backing plate is abolished to eliminate the troublesome work such as its attachment / detachment, cooling, application of a release agent, etc., and to provide a vulcanization method that does not cause defects such as unevenness at the burning boundary. Is.

[0007]

The present invention, as shown in FIG. 1, applies a long unvulcanized rubber sheet Sa to a short press 1
When intermittently advancing the heating plate length from one side of the heating plates 11 and 12 of 0 to the opposite side through the upper and lower heating plates 11 and 12, the unvulcanized rubber sheet Sa of one side of the heating plates 11 and 12 is An unvulcanized rubber sheet Sa is formed by stacking long release sheets 17 on the upper and lower surfaces.
Is conveyed by the release sheet 17, and then the unvulcanized rubber sheet Sa is heated between the upper and lower heating plates 11 and 12 together with the upper and lower release sheets 17 and 17 for a predetermined time, and then the heating plates 11 and 12 are heated. A continuous vulcanization method for a rubber sheet, characterized in that the upper and lower release sheets 17 and 17 are peeled on the opposite side, and the release sheets 17 and 17 and the vulcanized rubber sheet Sb are individually wound. Is. In FIG. 1, 18A and 18B are winding rolls for the release sheet 17.

The rubber sheet Sa is a rubber sheet made of natural rubber and any synthetic rubber such as NBR and SBR. As the release sheet 17, commercially available release paper, polyester film, fluororesin film,
A glass fiber cloth coated with a fluororesin is preferable. The short press machine 10 to be used is provided with a pair of upper and lower hot plates 11 and 12 which can be opened and closed, and the press stroke thereof is preferably 30 to 50 mm. And
In the present invention, the unvulcanized rubber sheet Sa is sandwiched between the upper and lower release sheets 17 and 17 and conveyed by the release sheets 17 and 17. That is, the release sheet 17 works as a conveyor, and the conveying speed is preferably 2 to 20 m / min.

Since the unrolled rubber sheet Sa and the long liner sheet are superposed on the unrolled rubber sheet Sa, the unrolled rubber sheet Sa is pulled out from the winding roll. , This unvulcanized rubber sheet Sa
The above liner sheet is peeled off.

[0010]

In this invention, the unvulcanized rubber sheet Sa is sandwiched between the upper and lower mold release sheets 17 and 17, and is sent between the upper and lower heating plates 11 and 12 by the mold release sheet and vulcanized as it is. Therefore, the unvulcanized rubber sheet Sa is subjected to vulcanization without being subjected to abnormal tension accompanying transfer. After the vulcanization is completed, the upper and lower release sheets 17 and 17 are peeled off, so that the peeling is easy and the rubber sheet Sb is not damaged at the time of peeling.

[0011]

2 and 3 show an example of a continuous vulcanizing apparatus suitable for carrying out the present invention. FIG. 2 shows the first half of the above apparatus,
FIG. 3 is the latter half. In FIGS. 2 and 3, 1
0 is a short press machine, 11 is a lower heating plate that can be raised and lowered,
12 is a fixed upper heating plate. A winding roll (unvulcanized winding roll) in which the unvulcanized rubber sheet Sa is wound together with the liner sheet L on the supply side (left side in FIG. 2) of the press machine 10.
Ra is rotatably supported, and a winding roll around which a long liner sheet L is wound (liner winding roll).
RL is rotatably supported and is rotated by the drive of a winding device, and the unvulcanized winding roll Ra is rotated while winding the liner sheet L separated from the unvulcanized rubber sheet Sa. The sheet Sa is sent out.

Pressing machine 10 for the unvulcanized winding roll Ra
On the side, a plurality of first guide rollers 13, an unwinding speed adjusting roller 14, a plurality of second guide rollers 15 and a zigzag arrangement of third guide rollers 16 are sequentially arranged toward the press machine 10, and 2 guide roller 15 and third
The unvulcanized rubber sheet Sa having a length corresponding to one press is laid across the guide roller 16. The lower and upper heating plates 12 of the second guide roller 15 row
Long release sheet (release paper) 17 on each supply side
The winding roll 18A wound with is rotatably provided.
A brake device for preventing the inertial rotation is attached to the support portion of the release paper winding roll 18A.

On the other hand, on the discharge side of the pressing machine 10, as shown in FIG. 3, a pair of peeling rollers 21, which are in contact with each other,
A take-up device (not shown) for driving the pull-out roller 22, the fourth guide roller 23 of the lower release sheet 17 and the winding roll 18B of the lower release sheet 17 is arranged substantially linearly. Set up. In addition, the winding roll 18 of the upper release sheet 17 is provided above the peeling roller 21.
A winding device (not shown) for driving B is provided.

A fifth guide roller 24, a sixth guide roller 25, a winding speed adjusting roller 26, a seventh guide roller 27 for guiding the vulcanized rubber sheet Sb to the upper rear of the peeling roller 21. The belt conveyor 28 and the winding device 29 are arranged in order, and the winding device 2
The vulcanized rubber sheet Sb is wound around the vulcanization winding roll Rb on 9.

In the above structure, the liner winding roll RL (see FIG. 2), the pulling roller 22 of the lower release sheet 17, and the winding roll 1 of the upper and lower release sheets 17 and 17 are used.
8B, 18B, the belt conveyor 28, and the rubber sheet winding device 29 are synchronized with the vertical movement of the lower heating plate 11 of the press machine 10, are driven and rotated when the lower heating plate 11 is raised, and are located on the supply side. The unvulcanized rubber sheet Sa is unwound from the unvulcanized winding roll Ra, and the release sheets 17 and 17 are wound intermittently by the lengths of the heating plates 11 and 12 from the winding rolls 18A and 18A of the upper and lower release sheets 17, respectively. And is supplied between the heating plates 11 and 12. Then, when the feeding movement is stopped, the lower heating platen 11 rises to pressurize and heat the unvulcanized rubber sheet Sa together with the upper and lower release sheets 17 and 17.

When the unvulcanized rubber sheet Sa is pulled out from the unvulcanized winding roll Ra, the liner sheet L is peeled off from the unvulcanized rubber sheet Sa and is wound up on the liner winding roll RL. On the other hand, when the unvulcanized rubber sheet Sa moves from the unwinding speed adjusting roller 14 and the second guide roller 15 to the third guide roller 16, the lower release sheet 17 is superposed on the lower surface thereof. Then, the distortion of the rubber sheet Sa caused by the tension while the unvulcanized rubber sheet Sa is wound in the unvulcanized winding roll Ra is caused by the rubber sheet Sa being the second guide roller 15 and the third guide roller 15. It is removed while stopped on the guide roller 16 in a tensionless state.

The unvulcanized rubber sheet Sa is supported and conveyed by the release sheet 17 on the lower surface, and the upper and lower heating plates 1 are provided.
It is sent between Nos. 1 and 12, and at that time, the upper release sheet 17 is superposed on the upper surface, and the heating plates 11 and 1 are transferred by the above-mentioned conveyance.
When the unvulcanized rubber sheet Sa having a length equal to the length of 2 is supplied, the lower heating plate 11 rises and heating is performed for a predetermined time. By this heating, the vulcanization of the unvulcanized rubber sheet Sa is completed, and when the vulcanized rubber sheet Sb is obtained, the lower hot platen 11 is lowered and the forward feeding of the unvulcanized rubber sheet Sa and the like is started again. , The release sheets 17 and 17 above and below the vulcanized rubber sheet Sb at the position of the peeling roller 21 (see FIG. 3).
The upper and lower winding rolls 18 are peeled off and individually wound.
B and 18B are formed. Then, the vulcanized rubber sheet Sb is adjusted in tension while passing through the guide roller 24, the belt conveyor 28 and the like, cooled, and then wound to form a vulcanized winding roll Rb. The vulcanized winding roll Rb has a predetermined length of vulcanized rubber sheet S.
When b is wound, the vulcanized rubber sheet Sb is cut on the belt conveyor 28, and the vulcanization winding roll Rb is replaced.

In the embodiment shown in FIG. 4, the lower release sheet 17 is used.
Is wound around the third guide roller 16 in a staggered arrangement, then wound around the first guide roller 13 at the upper rear of the unwinding speed adjusting roller 14, and a large number of second guide rollers By guiding it straight to the pressing machine 10 along the upper surface of 15 and placing the unvulcanized rubber sheet Sa on this long linearly extending release sheet 17, its elongation becomes smaller than that of the embodiment of FIG. It was done like this.

[0019]

As described above, according to the continuous vulcanization method of the rubber sheet of the present invention, the long unvulcanized rubber sheet is reversed from one side of the heating plate of the short press machine through the upper and lower heating plates. When intermittently advancing the hot plate length to each side, on one side of the hot plate, stack long release sheets on the upper and lower surfaces of the unvulcanized rubber sheet,
The unvulcanized rubber sheet is conveyed by the release sheet, and then the unvulcanized rubber sheet is heated with the upper and lower release sheets for a predetermined time between the upper and lower heating plates, and then the upper and lower release plates are separated on the opposite side of the heating platen. It is a method of peeling off the mold sheet and individually winding these mold release sheet and vulcanized rubber sheet, and when feeding the unvulcanized rubber sheet forward, since it is conveyed by the mold release sheet, No tension is applied to the unvulcanized rubber sheet to cause elongation.

Further, since the release sheets on the upper and lower surfaces are peeled off after the completion of the vulcanization, there is no defect such as uneven thickness at the burning boundary as in the case of peeling the conventional duralumin patch plate. Further, a long release sheet is used instead of the duralumin backing plate, and this release sheet is pulled out from the winding roll on the supply side of the press machine and overlaid on the unvulcanized rubber sheet, and on the discharge side. Since it is peeled off and wound, the work of cutting a long unvulcanized rubber sheet into a predetermined length, for example, 10 m in advance and the attachment / detachment of a backing plate, the application of a release agent, which has been performed for each pressing, All the complicated work such as cooling becomes unnecessary.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pressing machine for explaining a main part of the present invention.

FIG. 2 is a cross-sectional view of the first half of the vulcanizing apparatus showing the embodiment of the present invention.

FIG. 3 is a sectional view of the latter half of the vulcanizing apparatus showing the embodiment of the present invention.

FIG. 4 is a cross-sectional view of the first half of the vulcanizer showing another embodiment of the present invention.

FIG. 5 is a sectional view of a pressing machine for explaining a conventional method.

FIG. 6 is a cross-sectional view of the rear of the press for explaining a conventional method.

[Explanation of symbols]

Sa: unvulcanized rubber sheet Ra: unvulcanized roll Sb: vulcanized rubber sheet Rb: vulcanized roll L: liner sheet RL: liner roll 10: short press 11: lower heating plate 12: upper heat Board 13, 15, 16, 23, 24, 25, 27: Guide roller 14: Rolling speed adjusting roller 17: Release sheet 18A, 18B: Release sheet winding roll 21: Peeling roller 22: Pulling roller 26: Roller for winding speed adjustment 28: Belt conveyor 29: Winding device

Claims (1)

[Claims] 1. When the long unvulcanized rubber sheet is intermittently forwarded from one side of the heating plate of the short press machine to the opposite side through the upper and lower heating plates by the length of the heating plate, on one side of the heating plate. Long release sheets are stacked on the upper and lower sides of the unvulcanized rubber sheet, the unvulcanized rubber sheet is conveyed by the release sheet, and then the unvulcanized rubber sheet is released between the upper and lower hot plates. A rubber characterized by being heated together with the release sheet for a predetermined time, and then peeling off the upper and lower release sheets on the opposite side of the heating plate, and individually winding the release sheet and the vulcanized rubber sheet. Sheet continuous vulcanization method.