JPH0140745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new continuous manufacturing method for synthetic resin corrugated sheets, and more particularly to a method for continuously manufacturing corrugated plastic sheets, and more particularly to a method for continuously manufacturing corrugated sheets, which allows the corrugation of the corrugated sheet product to be changed without interrupting the execution of the forming operation. This invention relates to a continuous plate manufacturing method.

In the conventional technology for continuously manufacturing synthetic resin corrugated sheets, the process begins with extrusion molding of the synthetic resin raw material into a sheet-like object, and then completes the entire forming process such as polishing, waving, trimming, cutting, and feeding of the sheet-like object. A method is adopted in which corrugated sheets having one type of corrugation are continuously mass-produced using a large-scale molding equipment that includes a process. For example, in a conventional continuous corrugated plate manufacturing apparatus as shown in FIG.
A thermoplastic synthetic resin raw material, such as polyvinyl chloride, is extruded to obtain a sheet with a thickness of 0.6 to 1.0 mm. The sheet thus obtained is applied to a polishing roll 2 and then in a corrugating section 3, for example in FIG.
Alternatively, a desired corrugation is applied using a corrugating device in which a plurality of sets of corrugating rolls as shown in B are arranged. The waves coming out of the corrugating device are cooled and solidified, and while being taken by a take-up roll 5, both ends are trimmed by a trimming device 4, and then held by a vise 6 that moves in synchronization with the corrugated sheet. The cutter 7 cuts it to a predetermined length. The corrugated sheet veneer P thus produced is separated from the forming device by a sharpening roll 8 and stored at a predetermined location.

However, in such a conventional method, when changing the corrugation of a corrugated sheet product, it is necessary to replace the extruder and the equipment performing the steps after the polishing roll. In other words, the part from the corrugation device to the deburring roll that was used to manufacture the previous corrugated sheet is removed from the entire forming process, and the part from the corrugation device to the deburring roll used to form the next different corrugated sheet is removed from the entire forming process. A series of equipment must be replaced and installed. Normally, a series of devices from the corrugating device to the edged rolls are fixed on one trolley, but the interruption time required for forming operations from the start of device changeover work to the restart of operation due to the production of different types of corrugated sheets is It takes at least 4 hours or more, and the labor and time loss in manufacturing corrugated sheets is significant.

In the past, when attempting to manufacture corrugated sheets with different waveforms, it was impossible to avoid the large-scale replacement work of equipment as described above, which resulted in many problems as described below. That is, when an extruder and a corrugating device are used in series as described above, the interruption of the molding operation causes the following inconveniences: PVC is generally used as the thermoplastic resin;
PVC remaining in the extruder and die is prone to thermal decomposition, so if the extrusion operation is interrupted, the PVC will decompose in the extruder and die and attack the extruder and die, so polishing and assembly will take 20 hours or more. It takes a long time and causes a huge loss of time;
In order to prevent the above-mentioned time loss, when replacing the corrugating device and the following parts while the extruder is running, the extruder can be maintained, but the raw resin is lost in an amount equivalent to the time required for the replacement work. If the raw resin output rate of the extruder is 170 kg/hr, a minimum resin loss of 680 kg will occur; in order to prevent the above raw resin loss, the synthetic resin sheet extruded from the extruder is cooled during the corrugation equipment replacement work. can be made into crushed recycled pellets, but has the disadvantage of requiring considerable labor and separate equipment for such regeneration; separate corrugating equipment for imparting different corrugations and other A large space is required to prepare and store the above-mentioned equipment in advance, and a large work area is required to replace the equipment; generally, the parts below the corrugating equipment are all integrated and held by a frame. Since it is a large device, it is not easy to move it.

Conventionally, in the production of synthetic resin corrugated sheets, product prices are kept low by mass producing a small number of corrugated sheet products, but in order to produce a wide variety of products in small quantities, it is necessary to replace the corrugations in many ways as described above. However, the problems in its industrial production have not yet been solved.

The present inventor has researched a method for continuously manufacturing corrugated sheets of thermoplastic synthetic resin, in which corrugated sheets of different shapes can be manufactured continuously without interrupting the extrusion operation, and has found many drawbacks of the conventional methods as described above. The present invention has been completed which eliminates the

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for continuously manufacturing corrugated sheets with different corrugations by easily changing the corrugation without interrupting the extrusion sheet molding operation of thermoplastic synthetic resin.

According to the invention, different waveforms, such as small waves (pitch; approximately 30-70 mm), large waves (pitch; approximately 70-130 mm)
Corrugations such as rectangular corrugations and rectangular corrugations can be manufactured continuously by a process that includes only one series of continuous corrugated sheet manufacturing equipment.

The object of the present invention is to supply a continuously extruded thermoplastic synthetic resin sheet to a corrugated roll unit including a row of upper and lower pairs of corrugated rolls, and to pass the sheet between the upper and lower pairs of corrugated rolls while hot. In a method for continuously manufacturing a thermoplastic synthetic resin corrugated sheet by Only the upper and lower pairs of corrugated rolls with the same corrugation are selectively brought together on the synthetic resin sheet supply surface, and the remaining corrugated roll pairs are left open from the surface to produce a corrugated sheet, and then are taken back. This is achieved by a continuous corrugated sheet manufacturing method characterized in that the corrugated sheet is taken up by matching the waveform of the take-up roll of the roll unit to the corrugated roll waveform.

The present invention will be described below with reference to the drawings.

FIG. 2 is a conceptual diagram schematically showing a pair of upper and lower corrugating rolls of a corrugating section for carrying out the method of the present invention. According to the method of the present invention, the thermoplastic synthetic resin sheet P that has passed through the extruder and the polishing roll is sent to a corrugated roll unit that incorporates a pair of upper and lower corrugated rolls as shown in FIG. 2A. It will be done.
In FIG. 2A, sets () to () are shown including the upper and lower pairs of corrugated rolls a and the upper and lower pairs of corrugated rolls b, and the sheet P is formed by the upper and lower pairs of corrugated rolls a. It is formed into a corrugated plate having a waveform a. As is clear from the figure, while the corrugated roll a is in operation, all pairs of upper and lower corrugated rolls B are isolated above or below from the sheet so that they do not participate in the forming operation by the corrugated roll A. It's getting old. The figure shows five pairs of upper and lower corrugated rolls a and b, but the number of these pairs depends on the type of thermoplastic synthetic resin raw material, the conditions of the sheet, etc.
A desired number can be selected depending on molding conditions and the like.

FIG. 2B shows sets () to () including upper and lower pairs of corrugated rolls a, b, and c. In this case as well, the thermoplastic synthetic resin sheet P is formed by the corrugated rolls a, and the corrugated rolls b and c are separated above or below the sheet P.

An example of a corrugated roll unit used in the method of the present invention is shown in FIG. FIG. 3 shows a device having the arrangement of corrugated rolls of FIG. 2A, arranged in a frame 31. FIG. For example, the corrugated roll a top and bottom pair row and the corrugated roll b top and bottom pair row are underframe 3.
A plurality of take-up units 36 are arranged independently and in series via take-up units 36 disposed on the left and right sides of 1. The upper and lower pairs of corrugated rolls A are involved in the production of corrugated sheets, and similarly the upper and lower pairs of corrugated rolls B are arranged alternately with the upper and lower pairs of corrugated rolls A in the underframe 31. are isolated either above or below.

The corrugated rolls are connected to pipes 34, 34', 35, and 35' by rotary joints, and the corrugated rolls are heated by a heating medium such as hot water sent through the pipes 32, 33, and 33'. Temperature is now controlled.

FIG. 4 shows the overall arrangement of an apparatus for carrying out an integrated operation for continuously manufacturing corrugated sheets by the method of the present invention. In FIG. 4, the thermoplastic synthetic resin raw material, such as polyvinyl chloride resin, polycarbonate resin, etc.
It is extruded as a 1.0 mm sheet at a speed of 3 to 3.5 m/min. This sheet is then passed through a polishing roll 12 and heated to a temperature of 120-130 by a preheating unit 12'.
Temperature controlled at ℃. The sheet preheated to this temperature is sent to the corrugating roll unit 13.

Corrugated roll unit 13 preheated to a predetermined temperature
The sheets sent to the sheet are corrugated between the upper and lower pairs of corrugated rolls in the upper and lower rows of corrugated rolls a (see, for example, Figure 5A for the waveforms of the rolls). The roll temperature is controlled to have a negative slope so that the corrugated sheet exiting the roll unit is cooled and solidified, making it convenient for subsequent trimming operations. The solidified corrugated sheet is trimmed at both ends by the trimming unit 14 to have a constant width, and then transferred to the take-up roll unit 1.
5, the sheet is taken up in accordance with the extrusion molding speed of the sheet and sent to the next vise cutter unit. The corrugated sheet advances through the passage of the vise/cutter unit and the passage of the delivery roll unit 18, and when its tip contacts the limit switch 20, the vice 16 closes to prevent the corrugated sheet P from moving. However, when the vise is closed, the vise cutter unit moves in the direction of movement of the corrugated sheet in synchronization with the traveling speed of the corrugated sheet, and when the corrugated sheet has traveled a certain distance, the cutter 17 cuts the corrugated sheet. When cutting is complete, the vise opens and the vise/cutter unit returns to its original position. On the other hand, the cut corrugated plate P
is quickly sent to a stacker by a delivery roll and recovered as a corrugated sheet product.

According to the above process, a corrugated sheet product having corrugation a is obtained, but according to the present invention, a corrugated sheet having corrugation b can be manufactured as follows without interrupting the extrusion operation of the synthetic resin sheet; Combined with corrugated roll a in roll unit 13 () ~
A pair of corrugated rolls B (see, for example, FIG. 5B for the waveforms of the rolls) provided in () is previously controlled to a predetermined temperature with hot water.

Next, while a corrugated sheet having a corrugated shape a is being continuously produced, without cutting the sheet sent from the extruder, the corrugated rolls a are first opened upward or downward to isolate them; Next, in place of the corrugated rolls a, the corrugated rolls b, which were isolated above or below each set, are lowered or raised to press the extruded sheet to form the corrugated rolls b. have it placed. At this time, at the same time as the corrugated roll of the corrugated roll unit is changed, the corrugation of the take-up roll is changed from type A to type B so that the forming operation of the type B corrugated sheet can be carried out smoothly. In this way, the production of the B-type corrugated sheet is started, and thereafter, the B-type corrugated sheet products can be continuously manufactured in the same manner as the above-mentioned manufacturing of the A-type corrugated sheet.

It should be noted that the time required to replace the corrugated roll pair A with the corrugated roll B pair in the corrugated roll unit 13 is as short as about 0.5 minutes, and the sheet extruded during this time is about 2 m long. , a significant benefit is that sheet loss due to the time required for roll-to-row exchange is significantly reduced.

The take-up roll unit 15 consists of a roll group a or b that applies pressure from above to the troughs of the corrugated sheet in accordance with the a-type or b-type corrugation, and a large-diameter rubber roll C that supports the corrugated sheet from below. The roll group rotates around a fulcrum 15' according to the waveform of the corrugated sheet, so that it can immediately match the waveform of the corrugated sheet.

Unit 1 for performing each unit process of corrugated sheet manufacturing
2, 13, 14, 16, 18 are a pair of rails 10
By arranging the corrugated plates one after the other, the traveling direction of the corrugated plates can be easily maintained constant, but one rail is engaged with a wheel to hold the unit row in a straight line, and the other rail is flat. By allowing wheels to run freely on the top, the entire device can be moved and placed easily.

Furthermore, as shown in Fig. 2B, by configuring a pair of upper and lower corrugated rolls by two or more rolls with corrugations a, b, c, etc., one corrugated roll unit can be used. Many types of corrugated sheets can be manufactured quickly and easily. In addition, a corrugated roll (Fig. 5 A)
) can be made up of a unit member u as shown by the broken line, and when using such a corrugated roll, adjustment of the width of the corrugated sheet; handling (light); and switching of the upper and lower corrugated rolls is required. ; Work efficiency is extremely high when exchanging unused pairs of upper and lower corrugated rolls.

The present invention has been described in detail above.According to the present invention, it is possible to quickly change the corrugated rolls while the sheet remains in the continuous molding state, so the corrugated sheet can be continuously formed without stopping the operation of the extruder. Therefore, there is almost no loss of raw materials, and compared to conventional technology, the changeover work is not only easier and does not require manpower, but also the corrugation forming work can be restarted almost at the same time as the changeover. You can get excellent effects such as
In addition, by replacing the unused corrugated roll pair in the corrugated roll pair with a third corrugated roll pair having a different waveform during the manufacture of one corrugated sheet, corrugated sheets with many different types of corrugations can be continuously manufactured. It has the advantage of being able to

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional continuous manufacturing apparatus for corrugated sheet, and FIGS. 2A and 2B are conceptual diagrams schematically showing a set of upper and lower paired rows of corrugated rolls for carrying out the method of the present invention. , FIG. 3 is a diagram showing a corrugated roll unit having the corrugated roll arrangement of FIG. 2A,
FIG. 4 is a diagram showing the overall arrangement of the equipment that performs the integrated operation for manufacturing continuous corrugated sheet by the method of the present invention.
FIGS. 5A and 5B are diagrams showing examples of corrugated roll pairs. Codes in the figure: 1... Extruder; 2... Polishing roll; 3... Corrugated portion; 4... Trimming device; 5...
...Take-up roll; 6... Vise; 7... Cutter; 8... Edged roll; 10... Rail; 1
1... Extruder; 12... Polishing roll; 12'...
... Preheating unit; 13 ... Corrugated roll unit; 14 ... Trimming unit; 15 ... Take-up roll unit; 15' ... Fulcrum; 16 ... Vise; 17 ... Cutter; 18 ... Delivery roll unit; 20... Limit switch; 31...
...Underframe; 32, 33, 33'...Piping: 34, 3
4', 35, 35'... Pipe piping; 36... Take-up unit; a, b... Corrugated roll; P...
...Corrugated board.

Claims (1)

[Claims] 1. A thermoplastic synthetic resin sheet that is continuously extruded is supplied to a corrugated roll unit including a row of upper and lower pairs of corrugated rolls, and the thermoplastic synthetic resin sheet is heated by passing between the upper and lower pairs of corrugated rolls. In a method for continuously manufacturing a synthetic resin corrugated sheet, the corrugated roll unit includes a plurality of sets of upper and lower paired rows of corrugated rolls with different waveforms, and each set of upper and lower paired rows of the corrugated rolls has the same waveform. Only the upper and lower pairs of corrugated rolls are selectively brought together on the synthetic resin sheet supply surface, and the remaining pairs of upper and lower corrugated rolls are left open from the surface to produce the corrugated sheet, and the sheet is taken off by the take-up roll unit. A method for continuous production of corrugated sheet, characterized in that the corrugated sheet is taken by matching the waveform of the roll to the waveform of the corrugated roll.