JP4154550B2 - Windsock-type filter and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blow-off type filter provided in an air conditioner such as a building air conditioner and a factory air conditioner that opens a bag-like filter medium during ventilation and increases a filtration area, and a method for manufacturing the same.
[0002]
[Prior art]
As shown in FIGS. 5 and 6, a conventional streamer filter is formed of a filter medium made of glass fiber, synthetic fiber, or a combination felt thereof into a bag shape, and is inserted through opposing filter medium walls a and a of the bag-shaped filter A. A large number of sewing threads B that are sewn while leaving the bulge allowance b at each insertion portion in the space in the bag are arranged in parallel with a predetermined interval in the width direction of the bag, and each bulge of each sewing thread B Adhesive c is applied to the insertion thread portions of the opposing filter media walls a, a at both ends of the margin b, and both ends of each bulge margin b of each sewing thread B are applied to the opposing filter media walls a, a by drying or curing of the adhesive c. It is of a fixed and manufactured type. Thus, a large number of the wind-flow type filters were constructed in a unit type for large air volume treatment with a large dust collection area, in which each lip portion was airtightly attached to a frame body composed of an outer frame and a partition frame and arranged in parallel. As shown in FIG. 6, in each use, each streamer type filter A swells until a predetermined swell amount b of each sewing thread B is tensioned by the inflow of air. The bulge is limited to prevent the adjacent blow-off type filters A from contacting each other and to obtain a predetermined good air filter action.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional blow-off type filter, it is necessary to apply the adhesive to the predetermined positions at both ends of the swell margin in order to fix each sewing thread. For this reason, it is relatively difficult to accurately apply the adhesive to the predetermined positions. It was difficult and had drawbacks such as dislike that it caused product quality degradation and defects.
As a method for solving the above-mentioned problem, in Japanese Patent Publication No. 8-4699, as shown in FIGS. 7 and 8, the filter medium walls a and a of the bag-shaped filter are bagged with a plurality of rows of sewing threads B. In the manufacturing method of the blow-off type filter in which the swell b is left in the inner space and stitched, and both ends of the swell b of each sewing thread B are bonded to the filter medium walls a, a, the filter medium along the stitched portion by the sewing thread B A heat-sealable plastic tape d is overlapped on the outer surface of the wall, and after the stitching, the plastic tapes d on both outer surfaces are simultaneously heated to bond the entire length of the exposed sewing thread portion to the filter medium wall. However, according to the above method, since the sealing step is performed after the sewing step is completed, the sewing thread B is slackened or stretched during handling, and the desired swelling margin b cannot be maintained. In addition, the sewing thread has a defect such that the sewing thread comes off.
The present invention eliminates the drawbacks of the conventional blow-type filter, and aims to provide a high-quality blow-type filter with high workability and productivity, and a method for manufacturing the same.
[0004]
[Means for Solving the Problems]
The streamer-type filter of the present invention, as claimed in claim 1, is to sew the opposing filter media walls of the bag-like filter with a plurality of rows of sewing threads, leaving a swell margin in the bag inner space. In a blow-off type filter in which both ends of the swell of each sewing thread are bonded to the filter material wall, a breathable adhesive layer is formed on the outer surface of the wall material wall along the stitched portion by the sewing thread, and the entire length of the exposed sewing thread portion Is bonded to the filter medium wall.
According to a second aspect of the present invention, there is provided a method for manufacturing a blow-off filter, wherein the opposing filter media walls of the bag-like filter are sewn with a plurality of rows of sewing threads leaving a swell in the bag inner space, and each sewing is performed. In the method of manufacturing a blow-off type filter in which both ends of a yarn bulge allowance are bonded to a filter medium wall, at the same time as sewing with the sewing thread, spiral adhesive is spiraled on at least one outer surface of the wall material wall along the stitched portion. It is characterized in that a breathable adhesive layer is formed by coating in the shape and the entire length of the exposed sewing thread portion is bonded to the filter medium wall.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The filter material of the streamer-type filter of the present invention is obtained by integrally polymerizing glass fibers, synthetic fibers, or a combination felt thereof as a main material, and glass fibers, synthetic fibers, or a combination nonwoven fabric thereof as an outer cover material on the outer surface thereof. Can be used.
[0006]
As the sewing thread of the streamer-type filter of the present invention, a thread made of synthetic resin fibers such as cotton thread, polyester thread, aramid fiber thread and the like can be used. In particular, if it is a polyester yarn, the processability is good.
[0007]
The bag shape of the blow-off type filter of the present invention is parallel with an almost constant width from the inlet to the outlet with a filter medium interval of 35 to 50 mm, or inclined so that the outlet of the filter medium is wide with an inlet of 50 to 100 mm and the outlet is closed. Things can be used. In particular, an inclined one is advantageous in terms of pressure loss of the filter.
[0008]
In the method for forming a breathable adhesive layer of a blow-off type filter according to the present invention, the exposed sewing thread portion can be formed continuously in the form of a band having a width of about 15 to 35 mm, or can be formed intermittently.
The air-permeable adhesive layer is selected so that the application part by the adhesive is not completely closed and the air permeability of the filter medium wall is not significantly reduced. Specifically, for example, a breathable adhesive layer is formed by applying a hot melt resin adhesive in a spiral shape with a spiral nozzle. In order to make a spiral, such a spiral nozzle has a plurality of hot air blowing holes around the blowing hole, and the blown adhesive layer has a hot melt resin drawn into a thread shape and a spiral thread. It is formed on the filter medium wall in the form of an entangled nonwoven fabric.
Examples of the adhesive include hot melt resins such as polyolefin, polyethylene, and polyamide, and solvent-based adhesives. In particular, if it is an APP (softening point 115 ° C. to 150 ° C.) hot melt resin, the coating state is good.
[0009]
As the breathable adhesive layer, in addition to the spiral-shaped hot melt resin, a nonwoven fabric layer previously formed of a heat-fusible material such as a hot melt resin is prepared, and an exposed sewing thread portion of the filter medium wall It can also be formed by heating and pressure bonding with a heating roller after polymerization. Further, in order not to lower the air permeability of the nonwoven fabric layer, a heat-melting resin powder having a melting point lower than that of the nonwoven fabric material can be fixed to the exposed sewing thread portion of the filter medium wall in the form of dots.
[0010]
The air-permeable adhesive layer can be formed on both outer surfaces of the filter medium wall immediately after sewing, or formed on one outer surface of the filter medium wall to first prevent misalignment of the sewing thread, After cutting to the bag size of the filter, it can be reversed and formed on the other outer surface.
In particular, if a breathable adhesive layer is formed on both outer surfaces at the same time, the sewing and the adhesive can be solidified at the same time, and the production efficiency is remarkably improved by shortening the production time and man-hours.
[0011]
【Example】
Next, examples of the present invention will be described.
FIG. 1 to FIG. 3 show a blow-off type filter according to an embodiment of the present invention, 1 shows a bag-like filter, and the bag-like filter 1 is made of a polyester resin with a glass fiber felt as a main material and a back net on its outer surface. It consists of a filter medium made by integrally polymerizing synthetic fiber nonwoven fabrics, and the peripheral edges of the three sides excluding the bag-like mouth edge are firmly sewn together.
[0012]
The filter media walls 1a, 1a on both sides of the bag-like filter 1 facing each other are in the bag along the direction of the air flow flowing from the mouth portion toward the bottom edge, and the polyester resin sewing thread 2 is connected to the filter media walls. 1a and 1a are inserted in a zigzag shape, and are sewn with the bulge margins 2a being left at a number of locations in the bag space. The sewing thread is 75 mm on the entrance side in the bag width direction, and the exit side is closed and an inclined interval is provided, and a plurality of them are arranged, in the illustrated example, four. In the figure, reference numeral 3 denotes a hanger attached to the bottom edge corner of the bag-like filter 1.
[0013]
According to the present invention, in order to fix both ends of each bulge allowance 2a of each sewing thread 2, the sewing thread portions 2b that are exposed on the outer surfaces of the walls 1a of the opposing filter media walls 1a and 1a and are aligned in a line. 2b... Is formed by polymerizing the air-permeable adhesive layer 4 on the top to fix the sewing threads 2.
That is, both ends of each bulge allowance 2a of each sewing thread 2 are fixed to both outsides of the sewing thread 2 that passes through the surfaces of the filter media walls 1a and 1a. Thus, as shown in FIGS. 2 and 3, when the bag-like filter 1 is inflated by the inflowing air during use, it is inflated by the length of the inflating allowance 2a fixed to the constant length, and this predetermined inflating. Air purification is performed in the state.
[0014]
The breathable adhesive layer 4 of the present invention is a non-woven fabric in which hot melt resin threads are entangled, and the exposed sewing thread portions 2b, 2b,. If it is cured by overlapping, the sewing thread 2 can be fixed easily and quickly without the need for consideration and devices for applying adhesive to the insertion portions at both ends of the bulge allowance 2a. In addition, the time for waiting for the conventional adhesive to dry or harden can be omitted, and the sewing threads 2 can be simultaneously fixed to the opposing filter media walls 1a and 1a. In addition, since the adhesive layer is air permeable, the filter can be a low pressure loss filter without reducing the air permeability of the filter medium.
[0015]
Next, a manufacturing method will be described with reference to FIG.
First, the filter media 1 walls a and 1a are supplied from above and below and overlapped vertically, and the sewing thread 2 is sewn to the opposing filter media walls 1a and 1a by the sewing needle 5. Next, hot melt resin is discharged by hot air from spiral nozzles 6 and 6 from the outside of the filter media walls 1a and 1a, and the hot melt resin is formed into a nonwoven fabric in which a thread is entangled with a 20 mm width on the sewing thread portions 2b and 2b. The sewing threads 2 and 2 are fixed to the filter media walls 1a and 1a by the breathable adhesive layer 4 made of the hot melt resin.
Next, the filter media walls 1a and 1a are cut to a desired size, the side edges 7 and 8 and the end portions 9 of the filter media walls 1a and 1a are sewn and fixed, and the hanging tools 3 and 3 are sewn and fixed. Thus, the bag-like filter 1 as shown in FIGS. 1 to 3 is manufactured.
[0016]
【The invention's effect】
According to the present invention, the opposite filter medium walls of the bag-like filter are sewn with the swell margin left, and the entire length of the exposed sewing thread portion of the double-sided sewing threads aligned on the same line is simultaneously sealed by the air-permeable adhesive layer. Since the flow-through type filter is fixed to the surface, the manufacturing time is shortened and the production efficiency is remarkably improved as compared with the conventional method in which the individual seam portions are fixed one hole per side with an adhesive.
Further, according to the present invention, since the exposed sewing thread portion is bonded to the filter medium wall by the breathable adhesive layer, a filter product with a low pressure loss can be obtained without impairing the breathability of the filter medium.
Further, according to the present invention, since the exposed sewing thread on the filter medium wall reliably keeps a predetermined bulge allowance, a product that does not come into contact with adjacent filters or members and does not deteriorate the good filter action can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view of an embodiment of the airflow type air filter of the present invention. FIG. 2 is a cross-sectional view taken along the line II of FIG. FIG. 5 is a side view of a conventional air blow type air filter. FIG. 6 is a sectional view taken along line II-II in FIG. 5. FIG. 7 is a side view of a conventional air flow type air filter. FIG. 8 is a cross-sectional view taken along line III-III in FIG.
DESCRIPTION OF SYMBOLS 1 Bag-shaped filter 1a Filter medium wall 2 Suture thread 2a Puff allowance 2b Sewing thread part 3 Hanging tool 4 Breathable adhesive layer

Claims (2)

In the blow-off type filter in which the filter media walls facing each other of the bag-like filter are sewn with a plurality of rows of sewing threads leaving the bulge allowance in the bag space, and both ends of the bulge allowance of each sewing thread are bonded to the filter media wall, the sewing thread A blow-off type filter characterized in that a breathable adhesive layer is formed on the outer surface of the wall material wall along the stitched portion, and the entire length of the exposed sewing thread portion is adhered to the filter material wall. In the manufacturing method of the blow-off type filter in which the filter medium walls facing the bag-like filter are sewn with a plurality of rows of sewing threads leaving the bulge allowance in the bag inner space, and both ends of the bulge allowance of each sewing thread are bonded to the filter medium wall. Simultaneously with the sewing with the sewing thread, a breathable adhesive layer is formed by spirally applying an adhesive on the outer surface of the wall material wall along the stitched portion with a spiral nozzle to form the entire length of the exposed sewing thread portion. A method of manufacturing a blow-off type filter, wherein the filter is adhered to a filter medium wall.

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