JPH04243528A - Preparation of filter element - Google Patents

Abstract

PURPOSE:To prepare a filter element generating no wrinkles in its microporous membrane and excellent in productivity. CONSTITUTION:A pipe 1, a microporous membrane 2, a filtrate passing net 3 and a raw solution passing net 4 having seal treatment parts 6 at both ends thereof are prepared and, subsequently, the microporous membrane 2 is folded double to insert the pipe 1 and the nets 3,4 are superposed on the microporous membrane 2 to be spirally wound around the pipe 1 and the end part of the spirally wound element is filled with an adhesive 5 to form an adhesive part 9 and, next, the adhesive part 9 is cut so as to cut off the whole seal treatment parts 6. Work can be simplified and automated and a filter element generating no wrinkles in its microporous membrane and excellent in quality is obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a filtration element called a so-called spiral module for ultrafiltration treatment used for recycling electrocoating paint.

0002

[Prior Art] As shown in FIG. 1, an ultrafiltration device element generally used for recycling electrocoated paint is connected to a tube 1 having an opening in the center for guiding the filtered filtrate. A long microporous membrane 2 that wraps around the membrane, a long mesh net 3 that provides a gap for guiding the filtrate, and a gap that is also provided on the undiluted solution side outside the membrane for the undiluted solution to pass through. Long mesh-like nets 4 are alternately stacked and wound in a spiral shape, and the microporous membrane 2 is
An adhesive 5 is applied to both sides in the width direction of the microporous membrane 2 so that the stock solution and the filtrate do not mix together, and the microporous membranes 2 are adhered to each other to form a long bag shape. Moreover, adhesive is applied to the terminal end of the microporous membrane 2 to form a complete bag.

[0003] The conventional manufacturing method of the element for a filtration device shown in FIG.
and one layer of the net 4 for passing the stock solution, a total of four layers were simultaneously wrapped around the tube 1 for guiding the filtrate, and the microporous membrane 2 was wrapped while being coated with an adhesive to bond both sides in the width direction. .

0004

[Problems to be Solved by the Invention] In the method described in the prior art, it is difficult to obtain a uniform thickness depending on the viscosity and amount of adhesive to be applied. 3 and the stock solution passage net 4 were misaligned, causing problems such as wrinkles in the microporous membrane 2. In addition, because the adhesive was applied at the same time as the wrapping, even if wrinkles or other defects occurred, there was little time to interrupt the work and make corrections.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a method for manufacturing a filtration element that does not cause problems such as wrinkles and has excellent productivity. be.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention is constructed as follows. That is, a tube 1 having an opening 11, a long microporous membrane 2, a long filtrate passage net 3, and a long stock solution passage net 4 are prepared, and the stock solution passage net 4 is prepared. In this case, plugging processing portions 6 are formed in advance at both ends in the width direction.Next, the microporous membrane 2 is folded in half, the tube 1 is inserted near this fold, and the microporous membrane 2 is then folded in half. The filtrate passage net 3 is inserted between the two layers of the membrane 2, and the stock solution passage net 4 is placed outside the microporous membrane 2, and then the microporous membrane 2 and the filtrate passage net 4 are placed outside the microporous membrane 2. 3. Wrap the net 4 for passing the stock solution in a spiral around the tube 1, and then bonding the microporous membrane 2 and the net 3 for passing the filtrate to both ends of the net 4 in the width direction of the net 4 for passing the stock solution. The adhesive 5 is filled to form an adhesive part 9, and the adhesive part 9 is formed so that the length L in the width direction is longer than the length L' in the width direction of the filling treated part 6. Next, the adhesive portion 9 is cut so that the entire packing treated portion 6 is separated.

[0007]

[Function] After wrapping the microporous membrane and net around the tube, adhesive is filled at both ends of the microporous membrane and net and bonded.
The work can be simplified and the microporous membrane can be wrapped around the tube in a stretched state.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a cross-sectional view of the filtration element, Figure 2 is an enlarged cross-sectional view of the main part showing the beginning of winding in Figure 1, and Figure 3 shows the state in which the microporous membrane and net are wound around the tube using the manufacturing method of the present invention. 4 is a cross-sectional view of the main part showing the adhesive being injected into the end of the filtration element using the manufacturing method of the present invention, and FIG. 5 is a microporous membrane and net wrapped around the tube using the conventional method. FIG.

First, as shown in FIG. 3, an adhesive such as a hot melt resin is applied to both sides of a long net 4 for passing the undiluted solution, and then the microporous membrane 2 and the net 3 are bonded in a later process. , 4 to prevent the adhesive from penetrating into the inside of the net 4 for passing the stock solution, thereby forming a plugged portion 6. Next, as shown in FIG. 2, the microporous membrane 2 is placed over the tube 1 having the openings 11 for guiding the filtrate, and a long net for passing the filtrate between the two membranes 2. At the same time, a long net 4 for passing the stock solution through the membrane 2 is wound spirally around the outside of the membrane 2. When wrapped for the specified length, the adhesive 5 is attached to the end of the microporous membrane 2.
is applied and the microporous membrane is attached. After that, wrap adhesive tape, etc. around the outer circumference to prevent the winding from loosening.

Next, as shown in FIG. 4, the ends of the membrane 2 and the nets 3 and 4 wound around the tube 1 are attached to an adhesive injection mold 7. The outer peripheries of the mold 7 and the element are sealed with a suitable sealing material, such as an O-ring, to prevent the adhesive 5 from leaking to the outside. On the other hand, the adhesive 5 is filled in advance into a container 8 that can be pressurized from the outside, and the container 8 is attached to the mold 7. Thereafter, when pressure is applied from one side of the container 8 using air pressure or the like, the adhesive 5 is injected into the end of the element through the introduction hole 10 inside the mold 7. Then, the adhesive 5 is applied to the length L of the plugged processing part 6 from the end of the element.
'When the longer distance L is filled, the injection ends. After a while, when the adhesive 5 has solidified, the element is taken out from the mold 7, turned over, and the other side is adhered in the same manner. If the adhesive parts 9 can be formed on both sides in this way, the length of the adhesive parts 9 from the end of the element will be the length L' of the filling part 6.
The net 4 for passing the stock solution was cut off by cutting at a longer length, and only the ends of the net 4 were opened to obtain a filtration element in which the microporous membrane 2 sandwiching the net 3 for passing the filtrate was bonded. .

[0011]

[Effects of the Invention] As described above, the present invention does not apply adhesive at the same time when winding the microporous membrane and the net around the tube, which simplifies the work and prevents defects such as wrinkles on the microporous membrane. It can be automated, and high-quality filter elements can be produced economically.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a filtration element according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the winding start portion of FIG. 1;

FIG. 3 is a perspective view showing a state in which a microporous membrane and a net are wrapped around a tube according to the manufacturing method of the present invention.

FIG. 4 is a sectional view of a main part showing a state in which an adhesive is injected into the end of a filtration element according to the manufacturing method of the present invention.

FIG. 5 is a perspective view showing a state in which a microporous membrane and a net are wrapped around a tube using a conventional manufacturing method.

[Explanation of symbols]

1 pipe 2 Microporous membrane 3 Net for filtrate passage 4　Net for passing the undiluted solution 5 Adhesive 6　Filling processing section 9 Adhesive part 11 Opening of pipe L　Length in the width direction of the adhesive part L’　Length in the width direction of the filling part

Claims (1)

[Claims] Claim 1: A tube (1) having an aperture (11), a long low-light membrane (2), a long filtrate passage net (3), and a long filtrate passage net (3). 4) is prepared, and the net for passing through the stock solution (4) has packing treated parts (6) formed in advance at both ends in the width direction, and then the microporous membrane (2) is Fold it in half and place the tube (1) near this fold.
Then, the filtrate passage net (3) is inserted between the two layers of the microporous membrane (2), and the microporous membrane (
2), and then the microporous membrane (2) and the filtrate passage net (3) are arranged outside the membrane.
and the stock solution passage net (4) are wound spirally around the tube (1), and then the microporous membrane (2), the filtrate passage net (3), and the stock solution passage net (4) are wound around the tube (1) in a spiral manner. ) is filled with an adhesive (5) at both ends in the width direction to form an adhesive part (9), and the length (L) in the width direction of the adhesive part (9) is equal to the filling part (6). It is formed so that it is longer than the length (L') in the width direction, and then the filling part (
6) A method for manufacturing a filtration element, characterized in that the adhesive part (9) is cut so that the entire part is separated.