JP2542949Y2 - Web drying equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web drying apparatus for drying a web such as a running film or sheet by blowing air thereon.

[0002]

2. Description of the Related Art Conventionally, laminated materials such as plastic films and metal foils have been used for food packaging and pharmaceutical packaging.
A laminator is used for manufacturing the laminated material. In this laminator, a drying device is used in which an adhesive is applied to a running film (hereinafter, referred to as a web), and then the web is blown with dry air to dry the adhesive. Typically, the dryer had a dry air chamber with a plurality of nozzles for blowing dry air onto a running web.

[0003]

However, such a conventional laminator using a drying apparatus has a problem that the obtained product contains foreign matter. As a result of examining the cause of this foreign matter contamination, the present inventors have found that foreign matter mixed into the product is caused by foreign matter mixed in the air blown from the drying device.

The present invention has been made in view of such a conventional problem, and has as its object to provide a drying apparatus which does not cause foreign matter to be mixed into a product and does not cause poor drying.

[0005]

According to the present invention, there is provided a drying apparatus comprising: a drying air chamber having a plurality of nozzles for blowing dry air toward a running web; and a filter provided in each of the plurality of nozzles. , Upstream and downstream of the filter
And a differential pressure detecting device for detecting a differential pressure between the two.

[0006]

In the above-described drying apparatus, since the filters are provided in the respective nozzles, foreign matters are removed from the air immediately before being sprayed on the web, so that foreign matters are reliably prevented from being mixed into the web. Also, if foreign matter is caught and accumulated in the filter during operation, the passage resistance of the filter increases,
Insufficient amount wind blowing against the web, but which may cause insufficient drying, the passage resistance of the filter increases its
As the pressure difference between the upstream and downstream of the filter increases,
Can be detected by the differential pressure detecting device, whereby the occurrence of defective drying can be predicted, and the occurrence of defective drying can be prevented by replacing the filter at an appropriate time.

[0007]

1 is a cross-sectional view of a drying apparatus according to an embodiment of the present invention viewed from a direction perpendicular to a running direction of a web.
FIG. 3 is a cross-sectional view of the drying device as viewed in the running direction of the web. 1 and 2, reference numeral 1 denotes a running web,
The adhesive to be dried is applied to the upper surface. 2 is a roll for conveying the web, 3 is a drying hood forming a drying space, and 4 is a dry air chamber arranged in the drying hood 3. The dry air chamber 4 has a plurality of nozzles 5 at positions facing the running web, and a filter 6 is arranged at each nozzle 5. Here, as the filter 6, a filter having a mesh that can catch foreign matter that is mixed in the web and becomes a problem is used, and specifically, a wire mesh is preferable. An air circulation device having a fan 8 and a heat exchanger 9 for heating the air surrounding the fan 8 is provided in the dry air chamber 4, and the fan 8 is connected to an external drive motor (not shown). I have. Reference numeral 10 denotes a manometer (differential pressure gauge), which is a high pressure side pressure.
The connection port is above the filter 6 in the air drying chamber 4
Flow, and connect the low pressure side pressure connection to the air drying chamber.
-4, and therefore downstream from the filter 6.
Pressure difference between the inside and outside of the air drying chamber 4
An indicator is arranged to detect a differential pressure between the upstream and the downstream and displays the differential pressure. Therefore,
The manometer 10 constitutes a differential pressure detecting device that detects a differential pressure between the upstream and the downstream of the filter 6.

In the drying apparatus having the above-described structure, the drying air is sent to each nozzle 5 of the drying air chamber 4 by the fan 8, and is blown from the nozzle 5 to the web 1 running thereunder to dry the adhesive of the web 1. . At this time, since the air blown to the web has the foreign matter removed by the filter 6 in the nozzle 5 immediately before the blowing, the air is blown to the web in a state where there is no foreign matter, and the foreign matter is surely prevented from being mixed into the web. On the other hand, the filter 6 becomes clogged as foreign matter in the dry air is captured, and gradually becomes upstream of the filter 6.
The differential pressure between the air and the downstream increases, and the passing air volume decreases. If the passing air volume is abnormally reduced, there is a very serious drawback that poor drying occurs and residual odor of the solvent is generated in the product. However, in this drying device, since the manometer 10 always displays the differential pressure between the upstream and downstream of the filter 6, the operator monitors this differential pressure and sets a preset value (more than that). The filter 6 is replaced when the pressure difference reaches a pressure that causes poor drying when the pressure difference increases. Thereby, poor drying due to insufficient air volume can be prevented, and generation of residual solvent odor of the product can be prevented.

The filter 6 provided for each nozzle 5 is
In order to give a suitable resistance to the passing air, the air volume distribution passing through each nozzle 5 is also made uniform.

[0010]

As described above, since the drying device of the present invention is provided with a filter at each nozzle that blows dry air onto the web, foreign matter can be removed from the air immediately before being blown onto the web, and foreign matter mixed into the web can be prevented. It can be reliably prevented. Further, since a differential pressure detecting device for detecting a differential pressure between the upstream and the downstream of the filter is provided, it is possible to monitor the degree of clogging of the filter, thereby predicting the occurrence of poor drying, and By replacing the filter in
The occurrence of poor drying can be prevented. Thus, the drying apparatus according to the present invention has an effect that foreign substances can be prevented from being mixed into the obtained product and generation of residual solvent odor can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a drying apparatus according to an embodiment of the present invention when viewed from a direction perpendicular to a running direction of a web.

FIG. 2 is a cross-sectional view of the drying device of FIG. 1 as viewed in a running direction of a web.

[Explanation of symbols]

 1 Web 2 Roll 3 Dry Hood 4 Dry Air Chamber 5 Nozzle 6 Filter 8 Fan 9 Heat Exchanger 10 Manometer

Claims (1)

(57) [Scope of request for utility model registration] 1. A dry air chamber having a plurality of nozzles for blowing dry air toward a running web, a filter provided at each of the plurality of nozzles, and a filter disposed between an upstream and a downstream of the filter . A web drying device having a differential pressure detecting device for detecting a differential pressure.