JPH04208432A - Hot air circulating type drawing machine - Google Patents

Abstract

PURPOSE:To stabilize the quality by heating to a uniform temp. improve the thermal efficiency by applying a jet of hot air to a stretchable strip-like body and producing its circulation. CONSTITUTION:When the drawing width or factor of a stretchable strip-like body F to be drawn is set by operating drawing factor adjusting mechanism 4 to regulate the distance or opening angle between support plates 3, the movable plates 7b of a hot air guide plate 7 are automatically actuated responsively to the distance and the opening angle between these support plates 3 into contact with the inner surface of drawing pulleys 3a. In a case where the stretchable strip-like body F is composed of the film having little or no air permeability, when a jet of hot air is directed against a nearly central part of the film drawing zone by a hot air blower 5, this hot air is allowed to flow along the film surface to the entrance side 1 of the film and the exit side 0 thereof to heat the film entirely to a uniform temp. and then it is passed through hot air circulating passages 6 and sucked in by an air supply fan 51 of the hot air blower 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stretchable strip such as a polyethylene film (including one having slits), a net, a woven fabric, a non-woven fabric, etc. The present invention relates to a hot air circulation type stretching machine that stretches in a direction (hereinafter referred to as lateral stretching).

[Conventional technology]

Among the above-mentioned stretching machines, the following types have been proposed (Japanese Patent Publication No. 57-30056). That is, in this stretching machine, a stretching pulley and a circulation belt are attached to a pair of support plates that are arranged opposite each other in a convex shape, with the inlet side of the stretchable strip being narrow and the outlet side being wide. Both ends of the elastic band-like body are held and stretched laterally. In addition, as a means of heating the stretchable strip to an optimal temperature that facilitates stretching treatment,
It uses far-infrared heaters and heated air.

[Problem to be solved by the invention]

In this stretching machine, the radiant heat of the far-infrared heater and the heated air jetted from the nozzle are not recovered, so the radiant heat of the far-infrared heater or the heated air is discarded after the stretchable strip is heated to a predetermined temperature. This has the disadvantage of large heat loss, and on top of that, when far-infrared heaters are used, it is difficult to control the temperature of the radiant heat.
There was a problem in that when the introduction of the extensible strip was stopped, the extensible strip melted and the quality of the product was adversely affected. Furthermore, in the above-mentioned stretching machine, both support plates are connected by a spline shaft or the like so that they can be approached and separated, so that the width expansion dimension of the stretchable strip can be freely adjusted. Since it was fixedly arranged, it was not possible to heat the entire stretching section of the stretchable strip to a uniform temperature.

The present invention was made in view of the above-mentioned difficulties in conventional stretching machines, and aims to improve thermal efficiency by blowing hot air onto a stretchable strip and circulating it. The technical problem is to provide a hot air circulation type stretching machine which can heat a stretchable strip to a uniform temperature evenly and obtain a product with stable quality.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention conveys the stretchable strip by sandwiching both side edges of the stretchable strip between two sets of stretching pulleys and belts passed between the stretching pulleys. In a stretching machine configured to stretch in a direction, a hot air generation/blowing means for blowing hot air onto the strip, and a hot air reflux passage communicating with a suction port of the hot air generation/blowing means to recirculate the hot air blown onto the strip. It is characterized by having the following.

Further, the present invention may further include a hot air guide member that guides the hot air that has passed through the band-like body to the hot-air recirculation passage when the band-like body has air permeability.

Further, the present invention may further include a pulley displacement means for displacing the stretching pulley, and a width changing means for displacing the width of the guide member in accordance with this displacement.

[For production]

The hot air blown onto the strip from the hot air generating/blowing means is guided to the suction port of the hot air generating/blowing means through the hot air recirculation passage, thereby circulating the hot air between the hot air generating/blowing means and the strip.

In addition, in the case where a hot air guide member is provided, when the strip body has air permeability, the hot air passing through the strip body is guided to the hot air recirculation passage by the hot air guide member.

Furthermore, by changing the width of the guide member in response to the displacement of the pulley, leakage of hot air is reduced.

〔Example〕

Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

In the drawings, reference numeral (1) indicates the casing of the hot air circulation type stretching machine according to the present invention, numeral (2) indicates the base fixed to the bottom of the casing (1), and reference numerals (3, 3) indicate the base. A pair of supporting plates arranged oppositely in a figure eight shape on the platform (2) so that the inlet side (1) of the extensible strip (P) is narrow and the outlet side (0) is wide;
Reference numeral (4) denotes a stretching magnification adjustment mechanism (pulley displacement means) which connects both the support plates (3, 3) so that they can approach and separate.
, reference numeral (5) indicates a hot air generation/blowing device (hot air generation/blower means) disposed above between both support plates (3, 3) inside the housing (1), and reference numerals (8, 6) refer to the housing. (1
), a hot air reflux passage (symbol (7)) formed on the inlet side (1) and the outlet side (0) of the extensible strip (P).
are the extension pulleys (3a, 3) of the support plates (3, 3).
3a) A hot air guide plate (hot air guide member) placed between.

As shown in FIG. 1, the support plates (3, 3) are made up of a horizontal board (31, 31) and a side plate (32) extending from the horizontal board toward the hot air generation blower (7>). It is formed into an L shape.These support plays) (3,
3>, the horizontal board (31, 31) is placed on a pair of track rails (21° 21) and lip groove-shaped fixed rails (22, 22) laid on the top surface of the base (2). .

Both the support plates (3, 3) support movement of the extensible strip (F) in the width direction (lateral direction) by fitting a large number of steel balls (21a) into the surface of the track rail (21). In addition, a pair of fixing screws (22a, 22a) slidably inserted into the fixing rail (22) are inserted into the elongated holes ((1a, 31a) drilled in the horizontal board (31, 31)).
) and then tighten the nuts (22b, 22b) onto the corresponding fixing screws.
) is fixed to the base (2) by screwing in the fifth
(see Figure and Figure 6).

As shown in FIGS. 1 to 3, the side plates (32, 32) of both the support plates (3, 3) have a stretching plate on the inside thereof to sandwich both ends of the stretchable strip (P) to widen the width. Pulley (3
a) and the circulation belt (3b) are the attachments. Both stretching pulleys (3a, 3a) are directed from the inlet side (1) to the outlet side (0) of the stretchable strip (F) by operating a motor (33) installed on the outside of the side plate (32). It rotates. On the other hand, both circulation belts (3b, 3b) are
A plurality of turn pulleys (34, 3
4,...) on the upper half outer peripheral surface of the stretching pulley (3a), and moves inverted on the half outer peripheral surface of the stretching pulley as the stretching pulley (3a, 3a) rotates. . Both the circulation belts (3b, 3b) are connected to the second circulation belt (3b, 3b).
As shown in the figure, move a pair of tension pulleys (35, 35) movably supported by the side plate (32) at the inlet side (1) and outlet side (0) of the extensible strip (F) as appropriate. This makes it possible to adjust the clamping force of the stretchable strip (F) with respect to the stretch pulleys (3a, 3a).

As shown in FIG. 1, FIG. 5, and FIG.
), the horizontal substrate of both support plates (3,3) <31
．． A shaft (
A pair of holders (41, 41) rotatably connected via holders (41a, 41a) and bearings (23, 23) whose both ends are bases (2) on the inlet side (1) of the extensible strip (P). )
, and the reverse threaded portions (42a, 42b
) with the holder (41, 41) screwed onto the first screw shaft (42
) is connected to this first screw shaft (42) via a chain (43), and both ends are connected to the side walls (11, 1) of the housing (1).
A second threaded shaft (1) is rotatably supported by a bearing via a bearing and has a reverse threaded portion (44a, 44b) at the center screwed into the upper part of the side plate (32, 32) of both support plates (3, 3). 44
) and a self-adjusting bearing (24,2
4) (see Fig. 7), and the reverse threaded portion (45a) at the other end is screwed into the hanging piece (37°37) of both support plates (3, 3). Third screw shaft (45
, 45) is connected to the third screw shaft (45, 45) via a chain (48, 48), and one end is connected to the housing (1
) is held on the side wall (11, 11) via the self-adjusting bearing (not shown) and has a reverse threaded portion (47a, 47a) at the other end.
and a fourth screw shaft (47, 47) screwed into the upper part of the steel plate (32, 32) of both support plates (3, 3).

As shown in FIG.
1, 41) approach and separate from each other along the base (2) so that the supporting plates (3, 3) can be freely adjusted to the spacing according to the width of the extensible strip (P), and , the third screw shaft (
45, 45), both support play) (3
, 3) are the shafts (41a, 41a) of the holder (41, 41)
It is configured so that the draw ratio of the stretchable strip (F) can be freely adjusted by rotating around the center.

As shown in FIGS. 2 and 4, the hot air generating blower device (5) is composed of a blower fan (51), a heater (52), a rectifying plate (53), and a louver (54). Two or more of the blower fans (51) and heaters (52) are arranged in parallel in a state facing each other on both upper sides of the side plates (32, 32) of the support plate (L8), and the heaters (52) A rear blower fan (51,
51), the direction is released to the current plate (53). The baffle plate (53) is arranged between the heaters (52.degree. 52) so as to form a roughly V shape, and guides hot air from the heaters to the louvers (54).

The louver (54) consists of an upper vertical louver (54a) and a lower horizontal louver (54b), and is a rectifying plate (53).
and the support plate (3), each louver (5
4a, 54b) wind direction adjustment plates (54al, 54a1.-
154b1.54b1. ...) is configured such that the air volume distribution of the hot air blown onto substantially the center of the stretched section of the stretchable strip (F) can be freely adjusted by adjusting the angle of the stretchable strip (F). The horizontal louver (54b) of this louver (54) has
As shown in FIG. 4, a pair of shirt plates (55, 55) are slidably attached to both sides in the longitudinal direction. These shutter plates (55, 55>) prevent a large amount of hot air from leaking to the outside by sliding them in accordance with the position of the support plate (3).

The hot air recirculation passage (8, 6) is! As shown in FIGS. 2 and 3, the extensible strip (P) is formed on the artificial side (1) and the outlet side (0) on both sides of both support plates (3, 3). The hot air reflux passage (6) on the inlet side (1) of the extensible strip (F) is connected to the front wall (12) of the housing (1) and both support plates (3, A sealing piece (12a) extending toward the side plates (32, 32) of 3), and both side plates (32, 32) above the sealing piece (12a).
A pair of heat-resistant cloth bellows sheets (81
, 61), and these bellows sea) (61
, 61) to attract the bellows sheet to the front wall (2), thereby forming a sealed passage communicating with the blower fan (51) of the hot air blower device (5). On the other hand, the hot air recirculation passage (6) on the outlet side (0) of the extensible strip (F) is connected to the rear wall (
13), a sealing piece (13a) extending from the lower part of this rear wall (I3) toward the side plates (32, 82) of both support plates (3, 3), and above this sealing piece (13a). It consists of a pair of bellows sheets (62, 62) made of heat-resistant cloth fixed to the side edges of both side plates (32, 32), and a magnet (82, 82) provided at the tip of these bellows sheets (82, 82).
By adhering the bellows sheet to the front wall (12) using 62a), the blower fan (
5I).

In addition, the sealing pieces (12a, 13a) and the extensible strip (F
), but the blower fan (51)
The flow of air with the outside can be restricted to a virtually negligible level by balancing the discharge and blowing.

As shown in FIGS. 8 to 10, the hot air guide plate (7) is mounted on a base (2) between both support plates (S, a).
) A sheath-shaped fixed plate (7a) supported via struts (72) on a frame (71) fixed to the frame (71), and movable plates (yb, 7b) attached to both sides of this fixed plate (7a). We are prepared. The fixing plate (7a) is formed in a polygonal arch shape consisting of a plurality of flat plate parts bent along the semicircular surface of the stretching pulley (31). The movable plate (7b, 7b)
are slidably attached to the respective flat plate parts constituting the fixed plate (7a), and a wire lobe (
73) One end is connected. And these movable plates (
7b, 7b) are adapted to be displaced by a movable plate displacement mechanism (width changing means). That is, the movable plate (7b,
7b) is a stretching pulley (7b) by connecting a weight (75) to the other end of a wire lobe (73) introduced into the inside of the frame (71) via a pulley (74) provided on the frame (71).
The movable plates (7b, 7b) are energized so that they can advance to the 31) side.
Casters (7c.

7c) It is adapted to slide on the inner surface of the stretching 1-li (3a). The hot air guide plate (7) is constructed by connecting a compression coil spring (75a) or a fluid pressure cylinder (75b) to the other end of the wire lobe (73) instead of the weight (75). 7b) on the stretching pulley (
3a) side (see Figs. 11 and 12), or by utilizing the spring force of a compression coil spring (76) disposed inside the fixing plate (7a). (see Fig. 13), and further actuates the piston rods (77a, 77a) of the fluid pressure cylinder (77) (see Fig. 14) to move both rotating plates (7b, 7b) to the extension pulley (3a). It may be configured to be assisted on the side.

In the stretching machine of this embodiment having such a configuration, the stretchable strip to be stretched (
When the stretching width and stretching ratio of P) are set, the hot air guide plate (7)
movable plate (7b.

7b) automatically follows the extension pulleys (3a, la).
(See Figure 3). In the stretching machine of this embodiment, as shown in FIG. When hot air is blown by the hot air generator (5) approximately in the middle of the section, this hot air flows along the surface of the film to the inlet side (1) and outlet side (0) of the film, evenly covering the entire area of the film. The hot air is heated to a uniform temperature, and then the hot air is passed through the hot air reflux passage (e
, e) of the hot air generating blower device (5).
1) is attracted. In addition, when the stretchable strip (F) is a multi-air film such as a slit film, when hot air is blown onto the middle part of the film by the hot air blower (5), the hot air is applied to the surface of the film. The hot air flows along the inlet side (1) and outlet side (0) of the film, heating the entire area of the film to a uniform temperature, and the hot air that has passed through the film flows along the hot air guide plate (7) to heat the film to a uniform temperature. It flows to the inlet side (1) and the outlet side (0). These hot airs pass through the hot air recirculation passages (8, 8) and are sucked into the blower fan (51) of the hot air generator (5).

The hot air sucked into the blower fan (51) in this way is heated to its original temperature by the heater (52) of the hot air generator (5).

Therefore, the drawing machine of this embodiment has a hot air diversion effect of the hot air guide plate (7), a sealing effect of the hot air return passages (6, 6), and a hot air suction effect of the blower fan (51) of the hot air generator (5). This makes it possible to prevent hot air from leaking to the outside and to greatly reduce intake of cold air.

The drawing machine of this embodiment is generally configured as described above, but
The present invention is by no means limited to the embodiments described above, and various modifications can be made within the scope of the claims. A heater (
52), but this heater (52)
between the rectifier plate (53) and the louver (54), or the louver (5) of the hot air generation blower (5).
4) or inside the hot air recirculation passageway (8), and adjust the air flow rate of the blower fan (51) of the hot air generation blower device based on the temperature of the hot air detected by this temperature sensor. Naturally, the plan is to automatically turn on the heater (52) to ON-OFP and adjust the temperature of the hot air as appropriate.

Moreover, the hot air generator (5) has a stretching pulley (3a).

3a) may be provided, for example, at the lower part of the band-shaped body (
P) may be conveyed by, for example, the lower arcuate portion of the stretching pulleys (3a, 3a).

〔Effect of the invention〕

As explained above, according to the present invention, since hot air is blown onto the extensible strip and the hot air is circulated,
The hot air after heating the stretchable strip can be reused, greatly improving thermal efficiency, and the stretchable strip can be evenly heated to a uniform temperature, making it possible to obtain a product with stable quality.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the inside of a hot air circulation stretching machine according to the present invention; FIG. 2 is an explanatory diagram showing the relationship among the support plate, hot air generation blower, and hot air recirculation passage of the hot air circulation stretching machine; Figure 3 is a plan view showing the relationship between the support plate hot air return passage and the hot air guide plate of the same hot air circulation type stretching machine, Figure 4 is a plan view of the hot air generation blower device in the same hot air circulation type stretching machine, and Figure 5 6 is a plan view showing the relationship between the support plate and the stretching ratio adjustment mechanism of the hot air circulation drawing machine, FIG. 6 is a front view showing the relationship between the support plate and the drawing ratio adjustment mechanism of the hot air circulation drawing machine, and FIG. Figure 7 is an enlarged sectional view of part A in Figure 6, Figure 8 is a perspective view of the hot air guide plate of the same hot air circulation type stretching machine, Figure 9 is an explanatory diagram showing the internal structure of the hot air guide plate, and Figure 10 is an explanatory diagram showing the internal structure of the hot air guide plate. Figure 11 is an explanatory diagram of the casters of the movable plate, Figure 11 is an explanatory diagram of the state in which the compression coil spring is connected to the wire lobe of the hot air guide plate, and Figure 12 is an explanatory diagram of the state in which the fluid pressure cylinder is connected to the wire lobe of the hot air guide plate. , Fig. 13 shows a modified example of the hot air guide plate, and is an explanatory diagram in which the movable plate is configured to be biased toward the extension pulley using a compression coil spring. FIG. 2 is an explanatory diagram illustrating a configuration in which a plate is urged toward a stretching pulley using a fluid pressure cylinder. (3): Support plate, (3a): Stretching pulley, (3b): Circulation belt, (4): Stretching ratio adjustment mechanism, (5): Hot air generation blower, (6): Hot air recirculation passage, (7) : Hot air guide plate, (7a) : Fixed plate, (7b) : Movable plate, (F) : Stretchable strip. Patent applicant Nippon Petrochemical Co., Ltd. 1. Polymer Processing Research Institute Co., Ltd. Figure 2, 2F, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, Figure 8, Figure 10, Figure 11. Figure 13 7:A Figure 14 1m -7777a

Claims (3)

[Claims] (1) In a stretching machine that stretches the stretchable strip in the width direction by sandwiching and conveying both side edges of the stretchable strip between two sets of stretching pulleys and a belt stretched across the stretching pulleys. , a hot air generating means for blowing hot air onto the strip-like body; and a hot-air reflux passageway communicating with the suction port of the hot-air generating means for refluxing the hot air blown onto the strip-like body. Circulating drawing machine. (2) The hot air circulation type stretching machine according to claim 1, further comprising a hot air guide member that guides hot air passing through the band to the hot air recirculation passage when the band has air permeability. (3) pulley displacement means for displacing the stretching pulley;
3. The hot air circulation type stretching machine according to claim 2, further comprising width changing means for changing the width of said guide member in accordance with this displacement.