JPH0362618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for treating ends of a thermoplastic resin sheet.

(Prior Art) For filtration to capture solid particles from a mixture of liquid and solid particles, a cylindrical filter made of porous material is generally used, and by passing the solid-liquid mixture through the peripheral wall of this filter, only the liquid is allowed to pass through the filter, and solid particles are captured on the peripheral surface of the filter.

Conventionally, the above-mentioned cartridge type filters have been manufactured by (a) a method of winding a fiber thread around a permeable core (commonly known as a wound type cartridge filter);
(b) Various fabrics, non-woven fabrics, sponges, etc. in the permeable core.
Alternatively, methods have been adopted such as winding a pleated filter paper or porous film, and (c) integrally molding a porous material such as sintered metal or inorganic material or sponge felt.

However, the wound type cartridge filter (a) has a disadvantage in that the axial size of the cartridge filter is unsuitable for high-mix, small-lot production. In other words, even if the diameter of the filter can be changed in the radial direction of the cylinder by reducing the number of turns or changing the type of fibers to be wound, Therefore, cutting to shorten the filter length is impossible, and if the setting of the winding device is to be changed to obtain the desired filter length, the traverse cam must be changed. Therefore, it is necessary to change the traverse cam for each lot and to design and manufacture a new traverse cam for new sizes.
Manufacturing a wide variety of products in small batches increases costs.

Further, in the cartridge filter manufactured by the method according to (b) above, in addition to filter media such as various cloths and nonwoven fabrics, a permeable core that holds these filter media is required to maintain the shape of the cartridge filter. This permeable core provides effective strength against fluid pressure differences during filtration, the core itself is filterable, and the filter media wound around this core is in contact with the non-permeable part of the core, and the contact part The filter medium has an essential defect in that it cannot function as a filter medium. This results in disadvantages such as pressure loss or increase in the filter medium and a decrease in the life of the filter medium when the filter is used.

Furthermore, in the cartridge filter obtained by the method (c) above, a new mold must be made in order to obtain the desired filter dimensions. This is because recently the dimensions of cartridge filters have been diversifying depending on the purpose, and considering that mini-sized (usually 100 mm or less in length and 40 mm or less in outer diameter) cartridge filters are required, there are many If we are forced to respond to small-lot production of different types and create filter molds for each type, this will lead to a rise in manufacturing costs. Furthermore, in the case of the above-mentioned mini-sized cartridge filter, although it is not difficult to manufacture a mini-sized mold per se, it is difficult to take out or remove the filter from the mold after molding.

Therefore, in order to eliminate the various drawbacks of the conventional filters mentioned above, the applicant created a cartridge filter by winding porous sheets into a hollow cylindrical shape and laminating them. We have developed a cartridge filter that does not require a separate mold (see Japanese Patent Application Laid-Open No. 15712/1983).

(Problem to be Solved by the Invention) However, when a thermoplastic resin sheet is wound to form a hollow cylindrical cartridge filter as described above, it is necessary to fix the wound ends to improve shape retention. However, if the conventional heat-sealing method in which plastic films are heat-sealed together using a heater is used to fix the end of the winding, the shape of the heater is flat and heat conduction is mainly in the plane direction. Therefore, even if the object is a plastic film such as the one mentioned above, it is difficult to wind a thick resin sheet and heat-seal the ends of the film, and it is difficult to wrap the film. When a thick resin sheet is wound around a core, it is not easy to position the end of the winding. In addition, with the method of fixing the wound end of a resin sheet by wrapping it around the outer periphery of a cylindrical resin sheet, it takes time to wind the thread, and productivity cannot be increased. There was a problem.

The present invention provides a method for treating the ends of a thermoplastic resin sheet, which can reliably fix the ends of even thick resin sheets, and a processing device that can be used directly to carry out this treatment method. It was done for that purpose.

(Means for Solving the Problems) In order to solve the problems of the prior art described above, the present invention provides a method for winding a thermoplastic resin sheet in multiple layers around a winding core and treating the end portion of the sheet. The winding end of the formed sheet is set in a fixed position, and the winding end portion is held down in the axial direction by a winding end presser plate, and then the required number of heater needles are passed through the winding end presser plate and applied to at least one layer of the sheet winding end. By inserting the sheet over a depth above, the sheet is locally heated to soften or melt it, and when the heater needle is removed, the part cools and solidifies, bonding the wound end of the sheet to the next layer, and forming the wound sheet. The end of the roll is fixed. Also,
As a device for realizing the above method, in a winding device that winds a thermoplastic resin sheet in multiple layers around a winding core using a friction drive method, the winding device supports the end portion of the wound roll-shaped sheet so as to be able to rise and fall freely. The heater mechanism includes a heat supply device, a plurality of heater needles vertically installed at a required interval below the heat supply device, and an arbitrary lower limit of the heat supply device. A lifting support mechanism that supports the sheet so as to be adjustable up and down, and a sheet holding plate that is supported by the heat supply device so as to be able to move up and down, elastically presses the winding end of the wound sheet, and has a hole through which the heater needle is inserted. We propose a winding edge processing device for thermoplastic resin sheets.

(Function) Based on the above structure, a thermoplastic resin sheet is placed on a conveyor belt, and the conveyor belt is driven to wind it around a core and wind it into a roll to form a predetermined rolled sheet. The winding end pressing plate is lowered to hold down the winding end of the wound sheet, and then the heater needle is lowered and inserted into the winding end portion, and the upper and lower layers are softened or thermally melted by reaching the next layer. After that, when the heater needle is pulled out, this area is cooled and fixed by the heater needle, and the end of the wound sheet is fixed.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows the external appearance of the main parts of the apparatus for implementing the present invention, FIG. 2 shows the same side view, and FIGS. 4A to 4E show the operating state.

The sheet winding mechanism 1 includes a conveyor belt 3 on which a thermoplastic resin sheet 2 is conveyed, and a shaft 5 of a drive roll 4 at the end of the conveyor belt 3.
The pulley 6 at the end, the pulley 10 on the output shaft 9 of the reduction mechanism 8 of the motor 7, and the belt 11 are hooked up.
The conveyor belt 3 is driven in the direction of the arrow in FIG.

On the other hand, a core support mechanism 13 for supporting the core 12 is provided at the end of the conveyor belt 3 . This winding core support mechanism 13 includes bearings 14, 14 fixedly installed at positions corresponding to the width interval of the conveyor belt 3.
A shaft 15 is pivotally supported between the shafts 15 and 15.
The bases of left and right support arms 16, 16 are fixed to the bases of the support arms 16, 16, and the winding core 12 is supported between the tips of these support arms 16, 16. are pivotable in the vertical direction, and when the support arms 16, 16 are lowered, the winding core 12 is positioned almost directly above the drive roll 4.

An air cylinder 17 is used as a driving source for vertically pivoting the support arms 16, 16.
The base of this air cylinder 17 is pivotally supported by a fixed member 18, and the tip of a piston rod 19 is connected to a small arm 20 at the base of the support arm 16. When the piston rod 19 is extended, the support arm 16,
16 is adapted to be pivoted upward about the shaft 15.

The heater mechanism 21 includes a heat supply device 22 having a built-in heating source, and a winding core 12 at the bottom of the heat supply device 22.
A plurality of heater needles 23, 23, etc. are vertically installed at predetermined intervals in the longitudinal direction of the heat supply device 2.
This heat supply device 22 is provided with a winding end pressing plate 25 that presses down the winding end 2B of the winding sheet 2A.

In the illustrated embodiment, the lift support mechanism 24 uses a link mechanism. That is,
Two links 28 and 29 are pivotally supported by shafts 30 and 31 on a support member 27 suspended from a fixed member 26, and a heat supply device 2 is attached to the tips of these links 28 and 29.
2 is pivotally supported by shafts 32 and 33 to form a parallel link mechanism, and is capable of moving up and down between the position shown by the chain line and the position shown by the solid line in FIG. As a driving source for this lifting support mechanism 24, the tip of a piston rod 35 of an air cylinder 34 is connected to the rear end of one link 28.
5 is extended, the heat supply device 22 is moved upward,
It is designed to be lowered at the same time.

In FIG. 2, reference numeral 36 is a stopper that defines the lowering limit of the heat supply device 22, and the lowering amount of the heat supply device 22 is such that the heater needles 23, 23 touch the winding end 2B of the wound sheet 2A and the next layer The stroke is set to just push in to a depth of . Although the stopper 36 is not shown in detail, the vertical position of the stopper 36 can be adjusted by operating a handle 37 shown in FIG. It is now possible to arbitrarily set the lowering limit of . Reference numeral 38 is a position detection sensor. Note that the lifting support mechanism 24 is not limited to the above-mentioned link mechanism, and may be other means.

The winding end pressing plate 25 is formed of a plate-like material having a length corresponding to the width of the winding sheet 2A and an arcuate cross-sectional shape that almost matches the arc surface of the outer peripheral surface of the winding sheet 2A. There is a heater needle 2 in the center in the longitudinal direction.
A hole 39 through which 3 and 23 can be inserted is provided.
The lower ends of a plurality of presser plate supports 40, 40, . . . are fixed to one end of the winding end presser plate 25.

These pillars 40, 40... are inserted into bearings 41, 41... provided on the side surface of the heat supply device 22,
A horizontal bar 42 is fixed to the upper end of these columns 40, 40..., and each presser plate column 40, 40... is supported so as to be slidable in the vertical direction all at once. The bases of plate-shaped springs 43, 43... are fixed to the heat supply device 22 at positions corresponding to the upper ends of these presser plate supports 40, 40..., so that when the presser plate supports 40, 40... rise, the bases of the plate springs 43, 43... The winding end pressing plate 25 is brought into pressure contact with the winding sheet 2A.

Further, a rolled sheet 2 is provided at the lower end of the presser plate support 40.
A sensor 44 is provided to detect the position of the winding end 2B of the winding sheet 2A, and is designed to detect the winding end position of the wound sheet 2A and obtain a signal for stopping the winding operation of the sheet.

The material of the thermoplastic resin sheet 2 used here is, for example, a sheet with a porosity of 65 to 95%, a degree of acetalization of 70 to 90%, a thickness of 0.5 to 10 mm, and one or more sheets having different pore diameters. A polyvinyl acetal porous sheet is used. The winding core 12 may be made of water-soluble phenolic resin, melamine resin, or urea resin with a resin solid content of 15 to 15%.
80% of the material used.

FIG. 3 shows an embodiment in which the above-mentioned device is combined with a core automatic supply device 45, in which cores 12 are intermittently supplied one by one to the lower part of a hopper 46 that stores a large number of cores 12. A supply port 47 is provided, and a core delivery rotating body 48 is provided opposite the supply port 47. This core sending rotary body 48 has a plurality of core receiving grooves 49, 49, .
By rotating the core delivery rotor 48 in the direction of the arrow, the core 12 is ejected from the core receiving groove 49 and delivered to the core support mechanism 13 of the sheet winding mechanism 1. In the figure, reference numeral 50 indicates a pressing member for pressing the winding start end of the sheet 2, 51 indicates a gripping tool, and 52 indicates a chute for receiving the finished product of the rolled sheet 2A.

Next, the operation of the above embodiment will be explained.

While supporting the core 12 on the core support mechanism 13, the sheet 2 is placed on the conveyor belt 3, and the heat supply device 22 of the heater mechanism 21 is placed in the raised position.
The motor 7 is started to drive the drive roll 4 in the direction of the arrow. As a result, the tip of the sheet 2 is connected to the winding core 12.
(Figure 4A).

When the winding is completed, the air cylinder 34 of the lifting support mechanism 24 of the heater mechanism 21 is shortened to lower the heat supply device 22. This heat supply device 22
As the winding end pressing plate 25 comes into contact with the outer periphery of the winding sheet 2A (FIG. 4B), the winding end 2B is detected by the sensor 44 as the winding sheet 2A rotates, and the winding end presser plate 25 contacts the outer periphery of the winding sheet 2A. Stop operation. As the heat supply device 22 further descends, the horizontal bars 42 at the upper ends of the columns 40, 40... of the winding end presser plate 25 spring 43,
43... and is pushed up, and due to the reaction force, the winding end pressing plate 25 strongly presses down the winding end 2B of the wound sheet 2A (the state before reaching C in FIG. 4).

Furthermore, as the heat supply device 22 descends, the heater needles 23, 23... are inserted into the winding end 2B, penetrate into the next layer of the winding end 2B, and the heat supply device 22 hits the stopper 36, causing its descent. Stop. As a result, the sheet is thermally melted by the heat of the heater needles 23, 23, . . . , and the winding end 2B and the next layer are fused together (FIG. 4C).

Then, when the air cylinder 34 of the elevating support mechanism 24 is extended and the heat supply device 22 is raised, the heater needles 23, 23, . . . are removed from the rolled sheet 2A (FIG. 4D). However, until the heater needles 23, 23... come out, the winding end presser plate 25 presses the wound sheet 2A as shown in FIG. 4D, and the heater needles 23, 23...
3, 23, . . . , the winding ends 2B are pulled together and prevented from peeling off.

When the heat supply device 22 further rises and returns, the winding end presser plate 25 also separates from the wound sheet 2A, and during this time the bonded portions heat-sealed by the heater needles 23, 23... are cooled and become fixed (Fig. 4). E), the state is returned to the state before starting. Note that in this embodiment, the fourth
In process D in Figure D, the winding sheet 2A is held down by its own weight on the winding end presser plate 25, but in the case of a resin sheet with a strong winding reaction force, the winding end presser plate 25 is held down by an adjustable spring until process E is completed. The plate 25 may be biased.

When used in combination with the automatic core feeder 45 shown in FIG. 3, everything from supplying the core 12 to collecting the rolled sheet product can be performed automatically.

(Effects of the Invention) As explained above, according to the present invention, since a cartridge filter is formed by winding a thermoplastic resin sheet, molding can be performed without requiring a permeable core or a mold. Moreover, since the end of the roll is partially fused by inserting a heater needle, even thick sheets can be reliably heat fused. When inserting and removing the heater needle, the winding end is held down by the winding end presser plate, so the winding sheet does not loosen and the winding end does not roll up when the heater needle is removed, ensuring a secure winding end. It is possible to fasten the ends of the winding and fasten the ends of the winding with high efficiency, so productivity is high and it can be provided at low cost. The axial length and thickness of the cartridge filter can be arbitrarily selected by selection, and the cost does not increase even if the number of lots is small. Furthermore, the thickness of the thermoplastic resin sheet and the bonding state based thereon can be easily adjusted by appropriately selecting the heater needle shape, heater temperature, fusion time, heater needle pressure, etc. You can get the following effect.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts showing one embodiment of the device for carrying out the present invention, Fig. 2 is a side view of the main parts, and Fig. 3 is a schematic view of the main parts when combined with an automatic core feeder. The side views of FIGS. 4A to 4E are explanatory views of the operation of the embodiment of FIG. 1. DESCRIPTION OF SYMBOLS 1... Sheet winding mechanism, 2... Thermoplastic resin sheet, 3... Conveyor belt, 4... Drive roll, 7... Motor, 12... Winding core, 13... Winding core support mechanism, 15... Shaft, 16... Support arm, 21... Heater hole, 22... Heat supply device,
23... Heater needle, 24... Lifting support mechanism, 25
... Winding end presser plate, 40... Presser plate support, 43...
Spring.

Claims (1)

[Claims] 1. In a method of winding a thermoplastic resin sheet in multiple layers around a core and treating the end portion of the sheet, the winding end of the wound sheet is set at a fixed position and the winding end portion is centered. The sheet is held down in the direction by an end presser plate, and then a required number of heater needles are inserted through the end presser plate to a depth of at least one layer of the sheet winding end to locally heat the sheet and soften or soften the sheet. End winding treatment of a thermoplastic resin sheet characterized by melting and removing a heater needle to cool and fix the part, bonding the winding end of the sheet to the next layer and fixing the winding end of the wound sheet. Method. 2. In a winding device that winds a thermoplastic resin sheet in multiple layers around a winding core using a friction drive method, a heater mechanism is provided that is supported so as to be able to rise and fall at the end of the wound roll-shaped sheet, and this heater The mechanism includes a heat supply device, a plurality of heater needles vertically installed at required intervals below the heat supply device, and an elevating device that supports the heat supply device so that it can be raised and lowered so that the lowering limit of the heat supply device can be adjusted as desired. A thermoplastic resin comprising: a support mechanism; and a sheet holding plate that is supported by the heat supply device in a vertically movable manner, elastically presses the end of the wound sheet, and has a hole through which the heater needle is inserted. Sheet end processing device.