JP2010248672A - Filter for painting booth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems of conventional filters for a painting booth that wrinkles and streaks are generated and adhesion failure occurs when pasting a net or sheet on an air outlet surface to prevent falling off of fibers, and increased cost caused by increase in number of materials and number man-hours. <P>SOLUTION: Falling off of fibers is prevented by heat-treating and melting a surface of a thermal bond nonwoven fabric filter media of a filter for a paint booth, thereby smoothing the surface. Furthermore, problems of troubles are solved, and the numbers of materials and man-hours are decreased to reduce the cost. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a paint booth filter used for cleaning air provided to a paint booth.

As a paint booth filter, for example, those disclosed in Patent Document 1 and Patent Document 2 are known. That is, by covering the one or both sides of the nonwoven fabric with a heat-fusible fiber sheet, the fibers are prevented from falling off, and the surface is flat and smooth to facilitate handling. In addition to the above, there are many products with nets attached to the surface.
JP 2005-111345 A JP2008-40295

Problems to be solved by the invention

However, the prior art has the following problems.
(1) Since two or more types of sheet-like materials such as sheets and nets are bonded to the nonwoven fabric surface, wrinkles and streaks are generated due to differences in heat shrinkage and tensile strength and elongation. Moreover, there existed a problem of a malfunction, such as a part with weak adhesion | attachment generate | occur | producing depending on processing conditions.
(2) Since two or more types of sheets are bonded together, there is a problem that at least two steps or more are required, and two or more types of materials are required, resulting in high production costs.

Means for solving the problem

  As a result of intensive studies to solve such problems, the present inventors have found that the above problems can be solved by directly performing heat treatment on the surface of the thermal bond nonwoven fabric composed of the high-melting polyester fiber and the heat-fused polyester fiber. .

The invention's effect

  Based on this knowledge, the thermal bond nonwoven fabric of the present invention, as claimed in claim 1, heat-treats the surface of the short fiber nonwoven fabric to melt it and smoothes the surface, thereby preventing the fibers from falling off and making handling easy. In addition, the generation of wrinkles and streaks and poor adhesion can be eliminated, and the production can be improved in one process, so that the material used can be reduced and the cost can be reduced.

  As described above, the thermal bond nonwoven fabric of the present invention is characterized in that the surface of the thermal bond nonwoven fabric made of high-melting polyester fiber and heat-fused polyester fiber is melted and smoothed by hot plate treatment.

  There is no special restriction | limiting in the said high melting point polyester fiber, The polyester-type fiber generally manufactured and sold other than a heat-fusible polyester fiber is pointed out. However, considering the adhesiveness of the heat-fused polyester fiber, a material having good adhesiveness with the heat-fused polyester fiber is preferable.

  The polyester heat-bonding fiber refers to a core-sheath type or side-by-side type composite fiber made of two kinds of resins having a difference in melting point between a low melting point resin and a high melting point resin.

  The blending ratio of the heat-fused polyester fiber is 50% by mass or more. When the blending ratio of the heat-fused polyester fiber is less than 50% by mass, there are few adhesion intersections between the fibers, the intersection strength is weak, and fluffing occurs when the surface is rubbed. Is likely to occur, causing the fibers to fall off. Therefore, the blend ratio of the heat-fused polyester fiber is preferably 50% by mass or more.

  As a method of heat treatment on the surface of the thermal bond nonwoven fabric, the thermal bond nonwoven fabric is brought into contact with a hot plate or a heating roll heated to a temperature higher than the melting point of the low melting point resin of the heat fused polyester fiber and lower than the melting point of the high melting point resin. Only the surface is heated and melted.

  There is no restriction | limiting in particular in the material of a hot plate or a heating roll, What is necessary is just to have heat resistance, such as metal and resin. Further, in order to improve the peeling between the thermal bond nonwoven fabric and the hot plate or the heating roll, the surface of the hot plate or the heating roll may be coated with a fluorine tree or processed with a satin finish.

  The present invention will be described with reference to the drawings and examples. Drawing 1 is a figure explaining the surface state before and after the formed thermal bond nonwoven fabric passes a hot platen. Moreover, FIG. 2 is the schematic of the manufacturing process used for the Example based on invention.

Example 1
A non-woven filter medium of the thermal bond method having a smooth surface with the following fiber configuration was prepared.
Polyethylene terephthalate-based polyester fiber (fineness = 4.4 dtex, melting point 270 ° C.) is used as a high melting point polyester fiber by 30% by weight, and the core component is a polyester resin having a melting point of 255 ° C. and the sheath component is a melting point 110 ° C. A core-sheath type heat-sealable polyester fiber (fineness = 4.4 dtex) formed from a polyester resin was mixed by using 70% by weight. Next, the web 1 was spun using a cotton spreader and a carding machine 10, and these were superposed to obtain a target weight, which was introduced into a heating furnace 13 using a conveyor 12. Heating was performed in the heating furnace 13 at a temperature at which the center temperature in the thickness direction of the filter medium was 140 ° C., and the short fibers were thermally fused to obtain a thermal bond nonwoven fabric 3. Subsequently, one side of this serval bond nonwoven fabric was brought into contact with a metal hot plate 14 heated to a surface temperature of 180 ° C., held lighter than the opposite side of the contact surface, processed at a speed of 2 m / min, weight 296 g / m ² thickness 19 mm A thermal bond nonwoven fabric filter medium 4 having a smooth surface was obtained.
Even when the surface of the nonwoven fabric was rubbed with bare hands, no fibers were dropped. In addition, when evaluated by a test method according to JIS B-9908 Format 3, the mass collection average efficiency by mass method was 94.4%, and the filtration life was 651 g / m 2 of dust collection. The test conditions were a wind speed of 0.5 m / sec and a final pressure loss of 390 Pa. Moreover, the initial pressure loss of this nonwoven fabric was 23.5 Pa. Moreover, when this nonwoven fabric is evaluated by the flame retardancy test method according to JIS L-1091 A-1, the flame retardancy evaluation value is Category 3, and has the flame retardancy required as a filter for coating booths. It was. Thus, the nonwoven fabric obtained in Example 1 was a coating booth filter suitable as a coating booth filter.

(Example 2)
The nonwoven fabric filter material of the thermal bond method was created with the following fiber composition.
25% by weight of polyethylene terephthalate polyester fiber (fineness = 4.4 dtex, melting point 270 ° C.) is used as the high melting point polyester fiber, and the core component is a polyester resin having a melting point of 255 ° C. and the sheath component is a melting point 110 ° C. 50% by weight of core-sheath type heat-fusible polyester fiber (fineness = 2.2 dtex) formed from polyester resin and 25% by weight of core-sheath type heat-fusible fiber (fineness = 6.6 dtex) Were mixed to obtain a thermal bond non-woven filter medium having a smooth surface with a weight of 313 g / m ^{2 and a} thickness of 23 mm by the same processing as in Example 1.
Even when the surface of the nonwoven fabric was rubbed with bare hands, no fibers were dropped. Further, when evaluated by a test method according to JIS B-9908 Type 3, the mass collection average efficiency by mass method was 95.3%, and the filtration life was 366 g / m 2 of dust collection amount. The test conditions were a wind speed of 0.5 m / sec and a final pressure loss of 390 Pa. Moreover, the initial pressure loss of this nonwoven fabric was 40.2 Pa. Moreover, when this nonwoven fabric is evaluated by the flame retardancy test method according to JIS L-1091 A-1, the flame retardancy evaluation value is Category 3, and has the flame retardancy required as a filter for coating booths. It was. Thus, the nonwoven fabric obtained in Example 2 was a coating booth filter suitable as a coating booth filter.

(Comparative Example 1)
A thermal bond nonwoven fabric having a weight of 302 g / m ² and a thickness of 19 mm was produced in exactly the same steps as in Example 1 except that the metal plate was not contacted. The surface of this nonwoven fabric was not smooth, and when rubbed with bare hands, fluffing occurred and the fibers fell off. Since fibers easily fall off, when actually used in a painting booth, there is a high possibility that the fibers will adhere to the surface of the material to be coated, and it is judged unsuitable as a filter for painting booths.

Industrial applicability

The present invention is used in a filter for a paint booth, and is processed so as to prevent scattering of fibers due to fiber detachment during use. However, the manufacturing process is consistently connected to non-woven fabric production and has a single layer configuration. Therefore, there is a possibility of industrial use in that the process is simplified.

Sectional drawing which shows the state before and behind the heating plate of the filter of this invention The conceptual diagram which shows the manufacturing process of the filter of this invention

DESCRIPTION OF SYMBOLS 1 Short fiber web 2 Surface fusion | melting layer of a short fiber nonwoven fabric 3 Thermal bond short fiber nonwoven fabric 10 Carding spinning machine 11 Needling machine 12 Conveyor 13 Heating furnace 14 Hot plate 15 Winding product (roll)

Claims (3)

In the process of manufacturing the thermal bond nonwoven fabric,
(1) A step of uniformly heating a web composed of a mixture of a high-melting polyester fiber and a heat-bonded polyester fiber in a heating furnace to form a thermal bond nonwoven fabric by bonding between fibers (2) A method for producing a single-layer coating booth filter having a smooth surface by connecting a step of bringing the nonwoven fabric into contact with a hot plate or hot roll having a temperature higher than the melting point to remelt the surface layer portion.   2. The coating according to claim 1, wherein the web is composed of 10 to 50% by weight of high-melting polyester fiber and 90 to 50% by weight of heat-fused polyester fiber, and each short fiber is selected from the range of 1 to 100 dtex. Manufacturing method for booth filter   The high melting point polyester fiber is 10 to 50% by weight, and the heat-fused polyester fiber is 90 to 50% by weight. Each short fiber is 1 to 100 dtex, the weight per unit area is 100 to 500 g / m2, and the thickness is 10 to 30 mm. The filter for coating booths which consists of a single nonwoven fabric layer with a smooth surface by the manufacturing method according to claim 1

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