JPH04122623A - Stretching machine - Google Patents

Abstract

PURPOSE:To prevent a stretching belt-shaped body from generating creases, breakage and the like and also prevent a carrying means from heat deterioration by cooling the carrying means to be heated following the heating of the stretching belt-shaped body by means of a non-clamped section of the stretching belt-shaped body. CONSTITUTION:Both stretching pulleys 3a, 3a are rotated from an inlet side I of a stretching belt-shaped body F to its outlet side O by driving a motor 33 set outside a side plate 32. On the other hand, both circulating belts 3b, 3b are stretched in tension on the semi-peripheral surfaces of the upper sections of the stretching pulleys 3a by means of a plurality of turn pulleys 34, 34... disposed on the side plate 32 and turned over and moved on the semi-outer peripheries of the stretching pulleys following the rotation of stretching pulleys 3a, 3a. The stretching belt-shaped body F clamped by the stretching pullyes 3a, 3a and the circulating belts 3b, 3b are heated up to the given temperature by the hot air from a hot air generating blower 5, and directly heated stretching pulleys 3a, 3a and circulating belts 3b, 3b are cooled by the water in a tank 4 at the non-clamped section of the stretching belt body F.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stretchable belt-shaped body such as a polyethylene film (including one having slits), a net woven fabric, a non-woven fabric, etc. in its width direction. stretching (hereinafter referred to as lateral stretching).

) is related to a stretching machine.

[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. Further, the stretchable strip is heated to a temperature at which it is easy to stretch by radiating heat from a far-infrared heater or heated air from a nozzle.

[Problem to be solved by the invention]

In the above stretching machine, when the stretchable strip is heated by radiant heat or heated air during stretching of the stretchable strip,
Along with this, the stretching pulley and circulation belt are also heated. Here, although the strip is only temporarily heated, the stretching pulley and circulation belt are heated continuously, so that they are heated to a temperature substantially equal to or higher than that of the stretchable strip. For this reason, the gripping margin of the stretchable strip held between the stretching pulley and circulation belt may become taut and wrinkled, or in the worst case, the gripping margin may become thermally welded to the stretching pulley or circulation belt and tear. There are many disadvantages of extensible strips due to heating, such as damage or winding around the turn pulleys around which the circulation belt is stretched. Further, there is also the problem that the life of the circulation belt itself is significantly shortened due to thermal deterioration.

The present invention has been made in view of the above-mentioned disadvantages, and provides a stretching machine that can prevent wrinkles, tears, etc. of the stretchable strip and heat deterioration of the conveying means. The purpose is to provide the following.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a conveying means that pinches and conveys both edges of a stretchable strip and stretches it in the width direction, and a heating means that heats the strip while being conveyed by this conveying means. The present invention is characterized by comprising a cooling means for cooling the conveying means in a non-sandwiched portion of the band-shaped body.

Further, the conveying means is configured to include two sets of stretching pulleys that sandwich and convey both side edges of the strip, and a belt stretched around the stretching pulleys, and the cooling means cools at least one of the pulleys and the belt. It may also be a configuration.

[For production]

The conveying means, which is heated as the stretchable strip is heated, is cooled in a non-sandwiched portion of the stretchable strip.

〔fruit Execution example〕

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In the drawing, code (1) is the casing of the stretching machine, (2) is the base placed at the bottom of the casing (1), and code (3, 3) is the stretchable machine on the base (2). a pair of support plates facing each other in a convex shape with the inlet side of the strip (F) being narrow and the outlet side being wide;
Symbol (4) is a water tank (cooling means) that cools the stretching pulley (3a), which will be described later, and symbol (5) is a hot air generation blower (heating means) that heats the stretchable strip (P) to a predetermined temperature. (6) is a hot air guide plate that guides the hot air from the hot air generator (5) to the inlet and outlet sides of the extensible strip (F), and (60) is a guide roll.

Both support plates (3, 3) are made up of a horizontal board (31) fixed to the base (2) and a side board (32) extending from the horizontal board towards the hot air generation blower (5).
It is formed into a letter shape. As shown in FIGS. 1 and 2, the side plates (32, 32) of these supporting substrates (3, 3) are provided with stretching pulleys that sandwich both ends of the stretchable strip (P) and widen it. (Transporting means) (3a) and circulation belt (transporting means) (3b) are attached. Both the stretching pulleys (3a, 3a) are operated by a motor (33) installed on the outside of the side plate (32), so that the stretchable strip (F
) rotates from the inlet side (+) to the outlet side (0). On the other hand, both the circulation belts (3b, 3b) have side plates (
32) multiple turn pulleys (conveying means) (
34°34,...) is stretched over the upper half outer peripheral surface of the stretching pulley (3a), and the stretching pulley (3a, 3
Along with the rotation operation in a), the stretching pulley is reversely moved on the half outer periphery. Both circulation belts (3b, 3b) are connected to a pair of tension pulleys (3b, 3b) movably supported on the side plate (32) at the inlet side (+) and outlet side (0) of the extensible strip (F). By appropriately moving the transport means (35, 35), the clamping force of the stretchable strip (F) with respect to the stretch pulleys (3a, 3a) can be adjusted.

Said water t'! (4) is fixedly fixed to the inner lower part of the side plate (32, 32) of both support plates (3, 3),
It receives the circumferential portion of the lower end of the extension pulley (3a, 3a). Water (W) is supplied and drained to this water tank (4), and the water stored inside cools the non-clamped portion of the extension pulley (3a).

The hot air generation blower device (5) is arranged above both support plates (3, 3) inside the housing (1). As shown in FIG. 1, this hot air generation blower device (5) consists of heaters (51, 51) arranged opposite to each other on both sides of side plates (32, 32) of both support plates (3, 3).
) to a predetermined temperature, the rear blower fan (5
2, 52), the hot air is sent to the louver (54) via the V-shaped rectifying plate (53) in the center, and the louver (54) adjusts the air volume distribution of the hot air to control the stretching section of the extensible strip (F). The structure is such that hot air is blown over approximately the entire central area.

The hot air guide plate (6) is fixed to the base (2) via a support (not shown). This hot air guide plate (6) is curved into a convex arch shape along the semicircular surface at the upper part of the extension pulleys (3a, 3a) of both support plates (3, 3) (Fig. 1). and FIG. 2), when the extensible strip (P) is made of a breathable material such as a slit film, hot air is guided to the population side and the outlet side of the strip. Incidentally, when the extensible strip (F) does not have air permeability, hot air is guided along the surface of the strip to the inlet and outlet sides of the strip.

As mentioned above, the hot air guided to the inlet side and the outlet side of the extensible strip (F) is supported by both sides (3,
3) Partition walls (36°) provided on both sides of the side plate (32°32)
, 36) on the front wall (11) and rear wall (12) of the housing (1).
) formed by fixing the hot air reflux passage (37,
37), and is sucked into the blower fan (52, 52) of the hot air generating blower device (5).

Therefore, in the drawing machine of this embodiment having such a configuration, the stretchable strip (F) held between the drawing pulleys (3a, 3a) and the circulation belts (3b, 3b) is connected to the hot air generating blower (5).
The stretching pulleys (3a, 3a) and circulation belts (3b, 3b), which are heated to a predetermined temperature by the hot air of the hot air generator (5) and indirectly warmed by the hot air of the hot air generator (5), form the stretchable strip (F). The non-sandwiched portion of the tube is cooled by the water in the water tank (4).

In the above embodiment, only the stretching pulley (3a) was cooled, but as shown in FIG.
3a) and the circulation belt (3b, 3b) may both be cooled.

Furthermore, for example, an external duct may be used to circulate hot air from below to above, or vice versa, or a far-infrared heater may be used to heat the extensible strip. Also,
The stretching pulley (3a) and circulation belt (3b) may be cooled with cooling air.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reliably prevent the occurrence of wrinkles, tears, etc. in the stretchable strip, and it is also possible to prevent the conveying means from deteriorating due to heat.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing the outline of the drawing width according to the present invention, Fig. 2 is a plan view showing the relationship between the support plate and the hot air guide plate in the drawing machine, and Fig. 3 is the hot air in the drawing machine. FIG. 3 is a plan view showing the air generation device. FIG. 4 is an explanatory diagram showing another embodiment of the same stretching machine. (3): Support plate, (3a) Stretching pulley, (3b) Circulation belt, (4): Water tank, (F): Stretchable strip.

Claims (1)

[Scope of Claims] [1] Conveying means for stretching the extensible strip in the width direction while pinching and conveying both side edges of the extensible strip, heating means for heating the strip while being conveyed by this conveying means, and the above-mentioned conveying means. 1. A stretching machine comprising a cooling means for cooling the means in a non-sandwiched part of a strip. [2] The conveying means includes two sets of stretching pulleys that pinch and convey both side edges of the strip, and a belt stretched around the stretching pulleys, and the cooling means cools at least one of the pulleys and the belt. The stretching machine according to claim 1, characterized in that: