JP2009269268A - Drawing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing machine capable of reducing an energy loss and capable of maintaining a proper temperature of a heating area, by reducing heat quantity flow-out from a conveying-in inlet and a post-stretched outlet of a sheet-like object in a drawing machine side covered with a heating area chamber by simple constitution. <P>SOLUTION: This drawing machine guides the thermoplastic sheet-like object along a route closed with a plurality of links for grasping an end part of the sheet-like object, and stretches the sheet-like object while conveying it from an inlet side to an outlet side, and the drawing machine is provided with plate-like cushioning bands of upper and under faces opposed to sheet-like object faces conveyed to an outdoor side of at least one of the conveying-in inlet side and the post-stretched outlet side in the heating area chamber for stretching the sheet-like object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stretching machine for heating and stretching a sheet-like material such as a thermoplastic resin film.

  As shown in FIG. 3, a plurality of sheet-like objects 1 having thermoplasticity, which are arranged facing each other at both ends in the width direction, are connected to each other, and extend and contract in a fold-like shape to grip each end of the sheet-like object. A pair of link devices 7 and 8 for guiding the link 2 along the closed path 3 and extending the sheet 1 while transporting the sheet 1 from the entrance side to the exit side and then traveling back to the entrance side are provided. In a sheet-like material drawing machine, it is necessary to adjust and maintain the inside of the sheet-like material at a high temperature from the conveyance inlet to the outlet after drawing.

  In order to maintain and maintain such an interior at a high temperature, the drawing execution part of the sheet-like material drawing machine is covered with a heating region chamber of a heat insulating structure, and a heater is used for heating the sheet-like material. Radiant heating is performed by a hot air circulation type in which heated air is blown to the sheet-like material or heated, or by a radiant heater installed facing the sheet-like material.

  The inside of the drawing machine covered with the heating area chamber is controlled to a required temperature by a heater, but a conveyance inlet for starting gripping both ends in the width direction of the sheet-like material 1 by the links 2 and each end of the sheet-like material 1 At the outlet after stretching that opens the part from the link 2, the heating region chamber of the heat insulating structure has an opening outside the room temperature state, so that there is a heat loss due to a larger heat outflow than the opening at the outlet of the conveying inlet and after stretching. Also, there was a phenomenon that temperature control was not easy even in the heating region of the heat insulating structure on the drawing machine side adjacent to the conveyance inlet and the outlet after drawing.

  As a technique for solving this problem, Japanese Patent Application Laid-Open No. 58-201618 (Patent Document 1) provides a hot air flow blocking mechanism at each of the raw tube opening of the biaxially stretched film preheating layer and heating layer, It describes preventing the outflow of hot airflow and the inflow of cold airflow.

JP 58-201618 A

  However, the one described in Patent Document 1 is a type in which a gas is pressed into a raw fabric tube as an object to be stretched and stretched, and the hot air sealing mechanism is a structure that is in close contact with the object to be stretched. In the tenter method of pulling and stretching, the sheet-like material cannot be entangled and used.

  The present invention reduces the heat loss from the conveyance inlet and the outlet after stretching of the sheet-like material on the drawing machine side covered with the heating zone chamber with a simple configuration, thereby reducing energy loss and the appropriate temperature of the heating zone. An object of the present invention is to provide a stretching machine that can be maintained.

  In order to solve the above-mentioned problems, the present invention is arranged so as to be opposed to each other at both ends in the width direction of the thermoplastic sheet-like material, and is connected to each other to expand and contract in a folded scale shape while extending both ends of the sheet-like material in the width direction. A pair of link devices that guides a plurality of links to be gripped along a closed path, stretches the sheet-like material while being conveyed from the inlet side to the outlet side, and then travels back to the inlet side. A heating region chamber having a heat-insulating structure covering the link device and the gripped sheet-like material from a sheet-like material conveyance inlet to a post-stretching outlet, and conveying the sheet-like material in the heating region chamber The upper and lower plate-shaped buffer bands opposed to the front and back surfaces of the sheet-like material are provided on at least one outdoor side of the inlet side and the outlet side after stretching.

  Further, the buffer band is arranged so as to sandwich a plurality of links that hold both ends of the sheet-like material in the width direction. Further, the buffer band has a movable structure.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that high temperature air flows out from the heating area | region chamber for extending | stretching a sheet-like material with the upper and lower plate-shaped buffer bands, and can maintain energy saving and temperature management favorably. Moreover, the both sides of the upper and lower buffer bands form a duct shape by a plurality of links that grip both ends in the width direction of the sheet-like material, and can prevent the outflow of high-temperature air more effectively.

  Embodiments of a continuous heating apparatus according to the present invention will be described with reference to the drawings.

  The Example of the drawing machine of the sheet-like material based on this invention is described using FIG. 1, FIG. The stretching machine shown in FIG. 1 is disposed opposite to each other at both ends in the width direction of the sheet-like material, and is connected to each other to expand both ends in the width direction of the sheet-like material (thermoplastic resin film) 1 while expanding and contracting in a folded scale shape. It has a plurality of links 2 to be gripped, is guided along a closed path on the link guide rail 3, and stretches while conveying the sheet-like material 1 from the inlet side to the outlet side, and then returns to the inlet side. It is a drawing machine provided with a pair of link devices 7 and 8 (see FIG. 3) that travel in the same manner.

  Reference numeral 6 denotes a heating region chamber having a heat insulating structure that surrounds the stretching region of the sheet-like material 1 and maintains a high temperature suitable for stretching. At both ends of the heating region chamber 6 in the sheet conveyance direction, a conveyance inlet 4 and a post-extension outlet 5 for the sheet 1 are opened. In the stretching machine having only the above configuration, the heat in the heating region chamber 6 flows out from the openings of the inlet 4 and the outlet 5, but the amount of hot air circulation is high when heating is performed by hot air circulation heating. It corresponds to a few percent of the quantity.

  In this embodiment, as shown in FIGS. 1 and 2, an inlet upper surface buffer facing the surface of the sheet-like material 1 on the upstream side of the conveyance inlet 4 on the conveyance of the sheet-like material 1 outside the heating region chamber 6. An inlet lower surface buffering band 12 facing the band 11 and the lower surface (back surface) is placed in close contact with the heating region chamber 6 and close to the link 2. That is, the buffer band is arranged so as to sandwich a plurality of links that hold both ends of the sheet-like material in the width direction.

  With this configuration, the upper and lower plate-like buffer bands 11 and 12 facing both surfaces of the sheet-like object 1, and the plurality of links 2 that hold each end of the sheet-like object 1, upstream of the conveyance inlet 4. A duct-like space is formed, fluid resistance is generated, a pressure loss of about several tens of Pa is generated, and high temperature air can be prevented from being released from the heating region chamber 6.

  Similarly, also in the outlet 5 after stretching, the outlet upper surface buffer band 21 facing the upper surface of the sheet-like article 1 and the outlet lower surface buffer band 22 opposing the lower surface are brought into close contact with the heating region chamber 6 of the heat insulating structure, and It is possible to suppress the release of high-temperature air from the heating region chamber 6 to the outside even at the carry-out port 5 after stretching.

  As described above, since the discharge of high-temperature air from the inlet 4 and the outlet 5 is suppressed, energy loss can be reduced, and an appropriate temperature of the heating region chamber 6 can be maintained, so that uniform stretching can be performed. .

  In addition, since the sheet-like material (thermoplastic resin film) 1 is gripped and released by the link device 2 at each of the transport inlet 4 and the post-stretch outlet 5 of the stretching machine, it is necessary to check this operation and correct the trouble. There is a case.

  In order to cope with such a case, the inlet upper surface buffer band 11, the inlet lower surface buffer band 12, the outlet upper surface buffer band 21, and the outlet lower buffer band 22 are provided with a hinge or the like in the heating region chamber 6 so as not to obstruct work. (Not shown) can be opened and closed freely. In FIG. 2, a state in which the outlet upper surface buffer band 21 is opened is indicated by a broken line 21a. In addition to opening and closing by a hinge, this may be, for example, a folding structure, a bellows structure, a screen-like winding structure, or the like, as long as the buffer band is movable. With this movable structure, it is possible to easily check the operation of the sheet-like object 1 that is gripped and released by the link device 2 and correct it when there is a malfunction.

  Applicable to all tenter type film stretching devices.

It is a schematic block diagram of the drawing machine of the sheet-like material of an example of the present invention. It is a cross section of the drawing machine of a sheet-like thing similarly. It is explanatory drawing of the link apparatus of the drawing machine of the sheet-like material which adapts an Example of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sheet-like material (thermoplastic resin film), 2 ... Link, 3 ... Link guide rail, 4 ... Conveying inlet, 5 ... Post-extension outlet, 6 ... Heating area chamber, 7, 8 ... Link apparatus, 11 ... Upper surface of inlet Buffer zone, 12... Entrance bottom surface buffer zone, 21... Exit top surface buffer zone, 22.

Claims (3)

  Along the path where a plurality of links that grip both ends in the width direction of the sheet-like material are closed while being opposed to each other at both ends in the width direction of the sheet-like material having thermoplasticity and expanding and contracting in a folding scale shape. A sheet-like material stretching machine having a pair of link devices that are guided and stretched while being conveyed from the inlet side to the outlet side and then moved back to the inlet side. A heating region chamber having a heat insulating structure covering the link device from the conveyance inlet to the outlet after stretching and the gripped sheet-like material, and at least one chamber on the conveyance inlet side and the outlet side after stretching of the sheet-like material in the heating region chamber A stretching machine characterized in that plate-like buffer bands facing the front and back surfaces of a sheet-like material are provided on the outside on the upper and lower sides.   2. The stretching machine according to claim 1, wherein the buffer band is disposed so as to sandwich a plurality of links that hold both ends of the sheet-like material in the width direction.   3. The stretching machine according to claim 1, wherein the buffer band has a movable structure. 4.

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