JPS5830808B2 - Resin sheet heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device for a resin sheet, and the first invention is a method in which both sides of a continuous resin sheet supplied from a supply source are bitten with clanbutene and then intermittently transferred to a molding device. A sheet heating oven is installed in the straight path where the sheet is heated, and the oven is equipped with heating heaters corresponding to the lower and upper surfaces of the sheet, and a forced air circulation duct that blows out from the bottom and sucks in from the top, and the air is blown into the oven from the duct. The circulating air is passed between the heating heaters on the lower surface and blown onto the lower surface of the sheet, and the temperature inside the oven is adjusted by sucking outside air into the circulation duct at a timely manner. However, the resin sheet is heated evenly by the radiant heat from the heaters on the bottom and top surfaces of the sheet, and the circulating air heated by those heaters, and at the same time, the circulating air is used to prevent the resin sheet from hanging down to the bottom surface, which softens due to the heating. Supported by spraying from the bottom surface, it prevents heat expansion due to the weight of the heating center, making it possible to supply a heating sheet that maintains a nearly normal plane with respect to the molding device, and furthermore, the heating temperature can be adjusted by turning on the heating heater. The purpose is to change from troublesome configurations such as off control to adjusting the temperature of the circulating air by mixing in the outside temperature.

Further, the second invention comprises a sheet heating oven composed of a fixed heating frame and a movable heating rod that advances from a side retracted position, and a heating heater air forced circulation duct on the lower and upper surfaces is provided in the movable heating frame, The movable heating frame can be moved to a retracted position in a timely manner to interrupt sheet heating, and the main object of the first invention is further achieved by providing the movable heating frame in the heated sheet heating oven. Enable it.

A preferred embodiment of the present invention will be described.

FIG. 1 illustrates a sheet forming apparatus equipped with the apparatus of the present invention,
In the figure, reference numeral 1 denotes a support device that supports the rolled continuous resin sheet a in a rewindable manner, and constitutes a supply source of the present invention.

Reference numeral 3 denotes a pair of straight left and right guide rails for guiding the endless crumb chain 4 that reciprocates, and the guide rails 3 are passed through the inside of the sheet heating oven 5 and the forming device 6.

As the guide rail 3 and the crumb chain 4, conventionally commonly used ones can be used, so detailed illustrations and explanations thereof will be omitted.

A resin sheet a supplied from a supply source passes through a guide roller 2, and is bitten at both side edges by an upper running part of a crumb chain 4 guided in a straight line by a guide rail 3, and is driven by an intermittent drive device (not shown) into a sheet heating oven 5. After being heated through the inside of the molding device 6, the molded material is molded by a molding device 6, and then sent out from the molding device 6, removed from the crumb chain 4, and sent via a guide roller 7 to a trimming device (not shown).

The sheet heating oven 5 is supported by a frame 8, and the frame 8 has holes on the front and rear sides of FIG. 1 above and below the passing line of the resin sheet a, as shown in FIGS. Rails 9 and 10 that protrude significantly to one side are provided, and a front wall 11 and a rear wall 12 with high heat insulation properties are fixed to each outer surface of the rails 9 and 10.
The left and right side walls 13 and 14 made of small heat insulating plates that match the height of the passing line of the resin sheet a are fixed between the two,
The fixed heating frame 17 is constituted by the front wall 11, rear wall 12, and side walls 13 and 14 described above.

The guide rail 3 described above passes through the front wall 11 and the rear wall 12 and passes inside the left and right side walls 13 and 14. Slit 1 that allows sheet a to freely pass through
5 and 16 are provided.

In the above, the resin sheet passage gap formed in the rear wall 12 may be in the form of a narrow slit, but the resin sheet passage gap formed in the front wall 11 immediately behind the molding device 6 is easily deformed by heating. Since you will be passing things through, make the top and bottom heights a little larger.

Reference numeral 18 denotes a movable heating frame that moves back and forth between three positions, a retracted position to the side in FIG. 3 and an advanced position in FIG. 1
One end of each of the lower frame 20 that moves across the lower side of the resin sheet a that moves within the resin sheet 7 and the upper frame 21 that moves across the upper side of the same is fixed to a vertical side wall 19 that continues in the vertical direction to form a U-shape. , was constructed.

In the above, the vertical side wall 19, the lower frame 20, and the upper frame 21 all move close to the main walls 11, 12 between the front wall 11 and the rear wall 12, and the lower frame 20 moves closer to the bottom wall 20.
2, side plate 23, vertical side wall 19 (already described) and front plate 24,
It forms an open-top painting rack consisting of a rear panel 25, and a front panel 24.
On the outside of the recess formed in the rear plate 25 and the rear plate 25, a trochanter 26 is provided which fits into and rolls on the aforementioned rails 9, 9 having a U-shaped cross section.

The upper frame 21 forms a bottom-open drawing rack having a top plate 27, a side plate 28, a vertical side wall 19 (as described above), a front plate 29, and a rear plate 30. A roller 31 is provided which fits and rolls on the rails 10, 10 having a U-shaped cross section.

The movement of the movable heating frame 1B between the three positions is controlled by connecting the rod 33 of the horizontally placed cylinder 32 to the lower part of the fixed heating frame 17.

A heater mounting plate 35 is fixed to a peripheral frame 34 fixed to the lower frame 20 so as to wrap around the edge of the open top surface to close the open surface, and a large number of frame-shaped seeds are mounted on the top surface of the mounting plate 35. Heaters 37 are mounted in parallel, and a large number of air jet holes 36 are provided on the entire surface of the mounting plate 35.

A heater mounting plate 39 is fixed to a surrounding frame 38 which is fixed to the upper frame 21 by wrapping around the edge of the open lower surface to close the open surface, and a number of infrared heaters 40 are mounted on the lower surface of the mounting plate 39, and the above-mentioned mounting is performed. An air passage hole 4 is provided at the mounting part on the outer periphery of the plate 39.
1 will be provided.

Further, the respective peripheral side frames 34 and 3 of the lower frame 20 and the upper frame 21
Heat insulating seal plates 42 and 43 are attached to each part of B, which are brought into pressure contact with the inner surface of the side wall 14 of the fixed heating frame 17 when retracted as shown in FIG. 3, and are brought into pressure contact with the inner surface of the side wall 13 when advanced as shown in FIG.

44 is provided with a vertical part 45 on the outside of the vertical side wall 19 of the movable heating frame 18, and a horizontal pipe 46 is passed from the lower end of the vertical part 45 into the inside of the lower frame 20, passing over the upper frame 21 from the upper end to the iron frame 21.
Several sets of forced air circulation ducts are provided with transverse pipes 47 passing through the upper surface plate 27, and the transverse pipes 46 are connected to the lower frame 2.
An air outlet 48 that opens at the lower surface of the heater mounting plate 35 of the upper frame 21 is provided in the transverse pipe 47.
A suction port 49 is provided which penetrates the upper surface plate 27 at the upper surface of the .

Further, a motor 50 for fixing a fan for forcing air circulation is attached to each lower end of the vertical section 45, and an outside air intake port 51 is provided at the top thereof, which is opened by a cover plate 53 that rotates about a shaft 52 as a fulcrum. Each cover plate 53 is connected to the air cylinder 5.
It is connected to a reciprocating rod 56 connected to a rod 55 of No. 4.

The air cylinder 54 is actuated by a superheat temperature detection signal from a sensor that detects the internal temperature of the sheet heating oven 5, which consists of the fixed heating frame 17 and the movable heating frame 18 as described above. 53, the outside air intake port 51 is instantaneously opened, thereby cooling the circulating air heated by the heaters 37 and 40 to around the required heating temperature.

Note that when the heating movable frame 18 moves to the retracted position shown in FIG. 3, outside air flows into the space between the lower frame 20 and the upper frame 21 and cools the heaters 37 and 40, so the door plate 5 prevents this.
7 is provided outside the rails 9 and 10.

To explain the operation of the above embodiment, when the forming device 6 performs sheet forming operation, the movable heating frame 18 is moved forward from the retracted position in Fig. 3 as shown in Fig. 2, and the fixed heating frame 1
7 and its movable heating frame 18 constitute a sheet heating oven 5 in which only the resin sheet a and crumbbutene 4 can freely pass through, while the others are sealed.

Inside the oven 5, the upper and lower surfaces of the resin sheet a are heated by radiant heat from heaters 37 and 40 installed corresponding to the lower and upper surfaces of the resin sheet a, and at the same time, the forced air circulation duct 4
The air that is dispersed and blown up from the air outlet 48 of the heater 3 by the air outlet 36 of the heater mounting plate 35 is sent to the heater 3.
7, the heated air equalizes the heated atmosphere in the oven 5, and at the same time the heated air is sucked to the lower surface of the resin sheet a to operate the heating, and the resin is softened by the heating. It plays an important role as supporting air to prevent the central part of the sheet a from sagging.

The heated air collides with the lower surface of the sheet a and flows left and right as shown by the arrow, and flows from the air passage port 41 to the heater mounting plate 39.
and enters the duct 44 from the suction port 49,
By the action of the fan rotated by the motor 50, air is again blown out from the air outlet 48, causing circulation.

When the temperature inside the sheet heating oven 5 rises above the set value, the voltage across the heaters 37 and 40 is changed or the heaters are turned on or off based on the signal from the sensor that detects the heating temperature. Temperature control is performed to cool the circulating air by opening the outside air intake port 51 as described above, without performing off control.

When the resin sheet a loses sales due to heating, or when molding becomes impossible due to a malfunction in the molding equipment, or when the molding operation is interrupted for a break, the movable heating frame 18 of the sheet heating oven 5 is turned off. Move to the retracted position shown in Figure 3 and interrupt sheet heating.

As clarified by the description of the above embodiments, the present invention has the following features:
The first invention is to heat the sheet in a sheet heating oven not only by heaters placed on the upper and lower surfaces of the resin sheet, but also by directing air blown up from the outlet of the forced air circulation duct to the lower surface of the sheet between the lower heaters. The heated air is heated through the oven and then blown onto the bottom surface of the resin sheet.The heated air circulates inside the oven and is blown in from the air outlet above the sheet, so the resin sheet is heated only by the radiant heat of the heater. In addition, uniform heating can be performed by the temperature dispersion effect of the circulating heated air without causing uneven heating due to so-called temperature gradients, such as when heating is locally produced in areas where the heating temperature is high and areas where it is low. Since the heated air is blown onto the bottom surface of the resin sheet and has a special effect of supporting the sheet other than the clamp side edge, the resin sheet almost completely prevents the sheet from heating and retains its flat surface. This produces an excellent effect in that it can supply the molding equipment to the molding equipment.

Further, the second invention includes a sheet heating oven with a fixed heating frame,
Since it is composed of a movable heating frame equipped with upper and lower heaters and forced air circulation ducts, it is possible to control heating interruptions by removing the movable heating frame from the passage of the resin sheet at a timely manner even during molding operations. This invention has the advantage of making the heating interruption operation of a conventional resin sheet molding machine equipped with a sheet heating oven equipped with a heater much more effective and quick, thereby making the effect of the first invention even more significant.

[Brief explanation of the drawing]

The accompanying drawings show one embodiment of the invention, and FIG. 1 shows a schematic side view. FIG. 2 is a front view taken along the line A-A in FIG. 1. FIG. 3 is the same cutaway top view as FIG. 2 and shows the retraction of the movable heating frame. FIG. 4 is a side view taken along the line B--B in FIG. FIG. 5 is a partially cutaway rear view of the movable heatable frame. FIG. 6 is a cutaway view showing details of the heat sheet portion. FIG. 7 is a partially cutaway front view of the lower heater mounting plate. 3...Guidance rail, 4...Kranbutien, 5...
・Sito heating oven, 9, 10...Rail, 17...
Fixed heating frame, 18... Moving heating frame, 19... Vertical side wall, 20... Lower frame, 21... Upper frame, 30... Rear plate, 31... Trochanter, 35...・Heater mounting plate, 3
6...Air outlet, 37...Heater 39...
- Heater mounting plate, 40...Heater 44...Forced air circulation duct, 48...Blowout port, 49...Suction port, 51...Outside air intake port, 53...Lid plate.

Claims (1)

[Scope of Claims] 1 Both side edges of a continuous resin sheet supplied from a supply source are interlocked with clanbutene so that the sheet and clanbutene can freely pass through a straight path that is intermittently transferred to a molding device. A nearly hermetically sealed sheet heating oven is installed, and the oven is equipped with heating heaters corresponding to the bottom and top surfaces of the sheet, and a forced air circulation duct having an air outlet at the bottom and an air inlet at the top. The circulating air spouted from the outlet of the duct is passed between the heating heaters on the lower surface to be heated almost uniformly, and the air is blown onto the lower surface of the sheet as uniformly heated air and support air to prevent heating from sagging. A heating device for a resin sheet, characterized in that the temperature inside the box is controlled by sucking in an appropriate amount of outside air into the forced circulation duct at a timely manner. 2. A sheet heating oven is installed in a straight path in which both sides of a continuous resin sheet supplied from a supply source are interlocked with cranbutene and transferred intermittently to a molding device, and the oven allows the sheet and cranbutene to freely pass through. A fixed heating frame consisting of a front wall, a rear wall, left and right side walls covering the respective outsides of the sheet a and the crumb chain, and the lower and upper sides of the fixed heating frame are moved forward from the lateral retracted position. It is composed of a roughly U-shaped movable heating frame which is covered to form a substantially airtight shape, and the movable heating frame is provided with heating heaters that extend to correspond to the lower and upper surfaces of the sheet, and a suction port that has a suction port at the bottom and a suction port at the top. A forced air circulation duct is provided, and the circulating air ejected from the outlet of the duct is passed between the heating heaters on the lower surface to be almost evenly heated, and the air is uniformly heated to the lower surface of the sheet and is heated to prevent heating from dripping. A heating device for a resin sheet, characterized in that it is configured to suck air as support air.