JPH0667010U - Resin recovery device - Google Patents

Abstract

(57) [Summary] [Purpose] To capture and collect dust containing powder binder resin generated in the production line of bulky nonwoven fabric, and reuse it. [Structure] A resin recovery device used in a bulky nonwoven fabric production line, comprising a dust collection hood 1 and a dust collector 2 installed in a fleece molding machine, and a classification device 3 and a sorting device 4 connected to the dust collection hood 1. Composed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a resin recovery device that can be used in a bulky nonwoven fabric manufacturing line used for automobiles, construction / construction, home appliances, and the like.

[0002]

[Prior art]

 Conventionally, these fiber materials such as various natural fibers such as wool, cotton and hemp, various synthetic fibers such as polyester, nylon and vinylon, glass fibers and inorganic fibers such as rock wool are defibrated and used as binders. The following thermosetting resin and thermoplastic resin are dispersed and mixed, and the fleece is molded by a fleece molding machine, and then the fleece is heated by an appropriate heating means to cure the binder resin and to form a bulky nonwoven fabric. The method for producing is known. Depending on the purpose of subsequent use of the bulky nonwoven fabric, the curing state of the binder resin contained in the bulky nonwoven fabric can be changed by adjusting the heating temperature and time, and a semi-cured state that does not cure all the contained resins ( Semi-cure), in which case a hot press can be used as a means for forming the bulky nonwoven fabric in the subsequent step.

In addition, when a bulky nonwoven fabric is required to have strength in a product after molding, or when it is required to have moldability at the time of hot pressing for molding into a complicated shape, it is used as a binder. A simple method is to increase the amount of resin mixed. However, increasing the amount of resin not only increases the dust generated from the fleece molding machine and deteriorates the working environment of the nonwoven fabric manufacturing line, but also causes excess resin from the conveyor that conveys the fleece molding machine to the heating device. Problems such as falling will also occur.

[0004]

[Problems to be solved by the device]

 Therefore, the present invention does not deteriorate the working environment of the bulky nonwoven fabric production line even if the amount of the binder resin mixed in the bulky nonwoven fabric is increased, and at the same time, the excess binder resin is collected and reused without waste. The purpose is to develop a resin recovery device that contributes to resource saving.

[0005]

[Means for Solving the Problems]

 As a solution to this problem, the inventors of the present invention have earnestly studied and as a result, the dust is sucked from the place where the dust containing the most excess resin is generated, and the binder resin is passed through the classifier through the classifier and the binder resin We have succeeded in developing a recovery device for selecting only the above, and the gist of the present invention lies below.

[0006] A resin recovery device for use in a bulky nonwoven fabric production line, comprising a dust collecting hood 1 and a dust collecting device 2 installed in a fleece molding machine, a classifying device 3 connected to the dust collecting hood 2, and a sorting device 4. A resin recovery device characterized in that

A configuration example of a bulky nonwoven fabric production line will be briefly described. Various fibrous materials are first defibrated by a machine such as a pail feeder and a shredder, and a web of a considerable thickness is formed by a wrapper, a gage roll and the like. While the formed web is being conveyed by the conveyer, a resin spreader is used to spread a binder resin such as a thermoplastic resin, a thermosetting resin, or a mixed resin thereof on the web. The web is subjected to the secondary defibration by the cylinder of the fleece molding machine, and at the same time, the fiber raw material and the binder resin are mixed and the binder resin is uniformly dispersed in the web. The fleece molding machine turns the fleece into a fleece of a considerable thickness again, and the fleece is conveyed to the heating machine by the conveyor and the fleece is heated to facilitate molding workability. Is manufactured.

In the vicinity of the gauge roll, which is the exit of the fleece molding machine, powdery binder resin is generated as dust together with fiber scraps generated from the fiber raw material, which is a cause of significantly impairing the environment of the production line. . Therefore, a dust collecting hood 1 is provided near the exit of the fleece molding machine, and dust generated by an arbitrary means such as a drawing fan (not shown) is captured and stored in the dust collector.

The stored dust is discharged by a fixed amount by means such as a fixed amount feeder (not shown) provided in the dust collector, and the classification device 3 is operated by an arbitrary air transportation means such as a pushing fan (not shown). Sent to. Examples of the classifier include cyclones and back filters, which can be used. A cyclone classifies particles by utilizing the difference in specific gravity of dust by generating swirls, and a back filter classifies particles by a mesh. Other known devices that classify dust that has been pneumatically transported can be used without problems. Dust having a high specific gravity classified by the classifier drops into the classifier 4 by a fixed amount, and is finally classified into the fiber waste of the fiber raw material and the powder binder resin. The sorting device can be used without any particular limitation as long as it utilizes the difference in size, specific gravity, etc. of the two, and for example, an electric sifter or the like in which several kinds of appropriately selected meshes are combined can be exemplified. The selected binder resin is returned to the resin spreader again by a conveyer such as a conveyor, and mixed with a new resin for reuse.

Examples of binder resins that can be used include thermoplastic resins, thermosetting resins, and mixed resins thereof. When using a thermoplastic resin such as polyethylene or polypropylene, it is particularly preferable to add 100 g or more to 1 kg of the fiber component. A thermosetting resin such as phenol resin may be used alone or in combination with the thermoplastic resin. This is recommended. The thermosetting resin is excellent in moldability and shape retention of the fiber base material, but if it is added in an amount of 5% by weight or more of the total amount, the dynamic elastic modulus may be increased and the sound insulation may be deteriorated. As an example of the manufacturing method, after forming a fleece, it is heated to form a semi-cured fiber base material, and the fiber base material is cut into an appropriate size and formed into a molding die for forming an arbitrary shape. It is put on the surface and pressure-molded or heat-press molded to produce a product.

When a thermosetting resin such as a phenol resin is used alone, it is necessary to prevent the selected resin from absorbing moisture due to the humidity in the air. If it absorbs moisture, the thermosetting reaction may not occur. To prevent this, after the binder resin is sorted by a sorting device, it is transported by a closed facility including a transport conveyor, and if necessary, dry air is constantly sent by a facility such as a heating blower or warm air blower. is necessary.

[0012]

【Example】

 To provide an understanding of the present invention, examples will be described below. Needless to say, this proposal is not limited to the following examples.

[0013]

【Example】

 20 parts by weight of a phenolic resin as a thermosetting resin was mixed with 100 parts by weight of a mixed fiber raw material such as cotton and polyester to form a fleece, which was then heated to a semi-cure state and cut to produce a fiber base material. . The amount of phenolic resin consumed per hour was 200 kg.

[0014]

[Comparative example]

 The bulky fiber production line was operated under the same conditions as in the example to produce a fibrous base material, but the resin recovery device was not operated. The amount of phenolic resin consumed per hour was 250 kg.

[0015]

[Effect of device]

 Compared to the conventional bulky nonwoven fabric production line, the resin recovery device according to the present invention reduces the amount of binder resin used by about 25% to 23%, which improves the working environment of the production line and saves resources. It turned out to be useful.

[0016]

[Brief description of drawings]

FIG. 1 is a side view of a resin recovery device according to the present invention.
1: Dust collector hood, 2: Dust collector, 3: Classification device, 4: Sorting device

FIG. 2 is a side view when the resin recovery device according to the present invention is applied to a bulky nonwoven fabric production line. 5: Sheet forming machine, 6: Resin spreader, 7: Cylinder, 8: Conveyor, 9: Heating machine

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masashi Yanagida, architect Masashi Yanagida, Isohiro, Yachiyo-cho, Ibaraki 614, Ibaraki Plant, Nikko Industrial Co., Ltd. Stock company Isesaki factory

Claims (1)

[Scope of utility model registration request] 1. A resin recovery device for use in a bulky nonwoven fabric production line, comprising a dust collecting hood 1 and a dust collecting device 2 installed in a fleece molding machine, and a classifying device 3 and a sorting device 4 connected thereto. A resin recovery device comprising: