JPH0634091Y2 - Joint press for thermoplastic resin belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a joint press for a thermoplastic resin belt. More specifically, in a thermoplastic resin belt, for example, a belt made of polyurethane resin or vinyl chloride resin, a joint press for a thermoplastic resin belt, which is used for making the belt endless by melting the thermoplastic polymer at the end portion of the belt. Regarding

[Prior Art] In a conventional joint press for a resin belt, a hot platen 24 is arranged inside a pair of press frames 21 via a heat insulating material 22, as shown in the side view of FIG. On the inner side of the board, a slightly thicker pressing plate 27 having a thickness of 2 to 5 mm, which is slightly wider than the heating board 24, is arranged in layers via a cushion material 25.

The pressing plate 27 is formed to be slightly wider than the heating plate 24 in order to prevent the occurrence of stepping on the belt at the time of pressing the belt, and the cushion material 25 is intended to apply a uniform pressure to the belt. I am trying.

The heating plate 24 has a cooling means 28 and a heating means 23.
However, they are arranged in a meandering shape so as to cover the entire surface of the heating plate 24 evenly.

The end portions of the resin belt 32 supplied between the pair of press plates 21, 21 to be made endless are approximately 10 at a predetermined pressure between the pair of hot plates 24, 24 heated to 150 ° C. from room temperature. After being heated for ~ 15 minutes, the thermoplastic polymers on both ends of the resin belt are fused and fused together.

[Problems to be Solved by the Invention] However, in the conventional joint press for thermoplastic resin belts, since the pressurizing range is equal to the hot platen range, there is a boundary between the welded part within the hot platen range and the non-welded part outside the hot platen range. Line marks and boundary irregularities occur, and the unpressurized part is deformed. In order to solve this problem, as shown in FIG. 2, a holding plate slightly wider than the heating plate is provided above and below the belt to prevent a sudden pressure variation from occurring in the belt, or at the end of the holding plate ( Although a portion slightly wider than the hot platen) is forcibly cooled, it is difficult to finish the pressurizing portion and the non-pressurizing portion uniformly in appearance and dimensions due to deformation of the pressing plate. For this reason, it is possible to increase the thickness of the pressing plate, but in this case, the heat conduction from the heating plate deteriorates and the molten state does not occur.

The present invention has been made in view of the above-mentioned problems of the prior art, and includes a heating range and a cooling range rather than a conventional endless pressing method for preventing pressure inhomogeneity at a heating plate with a pressing plate. By providing a pressure bag that can expand the entire area at the same time as the pressure range, the boundary line that occurs after the thermoplastic polymer melted in the heating part is pushed out of the hot plate and then cooled An object of the present invention is to provide a joint press for a thermoplastic resin belt, which prevents unevenness in the appearance of the belt due to marks and uneven pressure, and prevents warping and deformation of the joint portion that occurs at the time of jointing a thin conveyor belt.

[Means for Solving the Problem] In order to achieve this object, the present invention has the following configuration.

That is, a heating plate having a heating and cooling function is arranged inside each of a pair of press frames via a heat insulating material, and cooling bars having a cooling function are arranged at both sides in the longitudinal direction of the heating plate via a heat insulating material. A fixed plate with a pressure bag that has a pressing plate that is installed inside and has an enlarged portion that overhangs from the side edge of the cooling bar, and that makes the entire pressure range including the hot plate part and the cooling bar part a pressing range. A joint press for a thermoplastic resin belt, which is provided on the lower press frame side.

[Examples] Next, specific examples of the joint press for thermoplastic resin belts according to the present invention will be described with reference to the drawings.

FIG. 1 is a partial perspective view of a joint press embodying the present invention, in which a pair of press frames 1 whose intervals can be adjusted.
A heating plate 10 having a length capable of covering the entire width of the belt 7 is arranged inside each of the heating plate 10 and the cooling device 11 via the heat insulating material 2. A cooling bar 8 having only cooling means 9 is provided in front of and behind the heat insulating material 2 '. Inside the heating platen 3 and the cooling bar 8, there is laminated a thin pressing plate 4 which is at least 20 to 30 mm longer than the surface length of the heating platen 3 and the cooling bar 8 in the belt longitudinal direction and has a thickness of 2 to 5 mm. It is installed in. This presser plate 4 is usually made of duralumin, iron,
It is desirable that it is made of aluminum or the like, has good thermal conductivity, is lightweight, and has little deformation due to heat.

Further, of the heating plates, a pressure bag 5 made of an elastic material such as rubber or resin that can be pressed by water, air or oil is provided outside the lower heating plate 3 together with a pressure bag fixing plate 6. The range of pressure applied by this pressure bag is expanded from the hot platen portion and the pressure is applied at the same pressure as the hot platen including the cooling bar portion.

FIG. 4 is a schematic partial perspective view of the pressure bag 5, which is a metal plate.
An elastic body 13 such as a rubber plate is laminated over the entire upper surface of 12, and a pressing plate 14 made of a metal plate, a resin plate or the like having a width of about 20 cm is provided around the upper surface, and the metal plate 12 and the elastic body 13 are separated from each other. A screw 15 is integrally fixed via a pressing plate 14. Further, in the central portion of the metal plate 12 on the lower surface of the pressure bag 5,
A hole 16 for injecting and exhausting pressure is drilled, and when water, air, oil, or the like is filled from the hole of the pressure bag fixing plate 6 at a predetermined pressure (4 to 6 kg / cm ² ), The elastic body 13 in the pressure bag 5 expands so that the cooling bar 8 and the heating plate 3 are simultaneously lifted to equalize the pressure of the pressing plate 4.

Then, both ends of the thermoplastic resin belt 7 supplied between the pair of press frames 1 to be jointed are brought into abutting contact with each other, and pressure is applied by the pressure bag 5 while adjusting the interval between the pair of press frames. , Both sides of the belt 7 are clamped by the presser plate 4. At this time, the heating plate 3 is heated to 150 ° C. to 170 ° C. by a heating means 10, for example, a heat source such as steam, electricity, or high frequency, and the cooling bars 8 on both sides are constantly cooled by a cooling means 11, for example, cooling water, In this state, the joint portion of the belt 7 is heated under a pressure of ² to 10 kg / cm ² for 10 to 15 minutes, and the thermoplastic polymers at both ends of the resin belt 7 are melt-fused and integrated.

Since the entire area including the heating part and the cooling part is pressed at the same time, even if the thermoplastic resin melted in the heating part overflows in the cooling part, there is a temperature gradient under uniform pressure, so the boundary mark is prevented. You can After the joint processing by heating is completed, since the belt surface still has adhesiveness, the heat source for heating the heating plate 3 is turned off, and the heating plate 3 is turned off.
The cooling means 11 is supplied, for example, to supply cooling water to cool the hot platen 3 to 40 ° C. or lower. The heating plate 3 is cooled, and further, the belt having a sticky surface is cooled, and the endless belt is taken out by separating the pair of press frames 1.

[Effect] In this invention, the heating range of the heating plate and the cooling bar is made wider than the heating range of the heating plate to pressurize the heating part and the cooling part at the same time, so that the thermoplastic resin melted in the heating part is projected. However, since there is a temperature gradient under uniform pressure, no boundary line mark is generated.

Also, the edge of the presser plate is completely cooled and the temperature rises as it gets closer to the hot platen, but since it is pressurized even in the part where the temperature is high to some extent, there is no heated part without pressurization here. There is an effect such that shrinkage or deformation of the generated boundary line mark or the melted material such as the belt is eliminated.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a joint press for a thermoplastic resin belt according to the present invention, FIG. 2 is a side view showing a conventional joint press, and FIG. 3 is a perspective view showing an outer appearance of a belt joint part. The figure is a schematic partial perspective view of a pressure bag. 1 ... Press frame 2, 2 '... Insulation material 3 ... Hot plate 4 ... Pressing plate 5 ... Pressure back 6 ... Pressure back fixing plate 7 ... Thermoplastic resin belt 8 ... Cooling bar 9, 11 …… Cooling means 10 …… Heating means

Claims (1)

[Scope of utility model registration request] 1. A heating plate having a heating and cooling function is disposed inside each of a pair of press frames via a heat insulating material, and cooling bars having a cooling function are provided on both sides in the longitudinal direction of the heating plate with a heat insulating material. The presser plate, which is placed through the presser plate, has an enlarged portion that extends from the side edge of the cooling bar and has a pressurizing bag that makes the entire pressurizing area including the hot platen portion and the cooling bar portion a pressurizing range. A joint press for thermoplastic resin belts, characterized in that a fixing plate is provided on the lower press side.