JPH0479290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a film or plate having an automatic nozzle adjustment device that automatically adjusts the slit gap of the nozzle for discharging molten material in the form of a film or plate using a control mechanism such as a thickness gauge and a computer. The present invention relates to an apparatus for manufacturing plate-shaped products.

A molding device that produces a film or a plate-like product by discharging a liquid molten substance from a die having a slit-like gap, such as a molding device that has a slit-like gap after heating a thermoplastic substance to a temperature higher than its melting point and melting it. A molding device that produces a film or plate-like product by discharging it from a nozzle, cooling it and solidifying it, or dissolving a non-thermoplastic substance in a certain kind of solvent and making it into a molten state, then discharging it from a nozzle with a slit-like gap, In molding equipment that removes solvents and produces film-like products, it is a basic required function to make the thickness of the film or plate-like material uniform, and the entire molding equipment is configured for this purpose. It is no exaggeration to say that. Among these, the mouthpiece that discharges molten material can easily change the thickness of the film or plate material by changing the slit shape, so it is generally equipped with a mechanism that can adjust the slit shape to meet the purpose. The thickness is adjusted by the operator etc. to obtain the desired thickness. That is, the thickness of the formed film or plate-like object is continuously measured in the width direction during molding, and the operator adjusts the slit shape of the die so that the measured value falls within the target thickness level range. is common. Also,
The adjustment mechanism for adjusting the slit shape changes the slit gap by applying a push/pull force from the outside within the range of elastic deformation of the structure forming the slit. More specifically, many adjustment mechanisms are used that change the gap between the slits of the cap using push and pull forces generated by the rotation of bolts provided in the width direction of the slits.

However, such manual thickness adjustment methods such as operators have problems not only due to differences in operator proficiency, but also when it comes to membranes or plate-like objects that require a high level of thickness, the adjustment limit may be exceeded. is often pointed out, and in recent years, as a countermeasure, measuring the product thickness of membranes or plate-like objects has been developed.
Against the backdrop of improved accuracy and reliability of so-called thickness gauges and technological advances in computer-based feedback systems, so-called automatic mouthpiece adjustment, which automatically adjusts the slit shape of the mouthpiece, was proposed and has entered the stage of practical application. It came.

A typical proposal for an automatic cap is, for example, in Japanese Patent Publication No. 55-38249, in which the slit gap is changed by rotating a bolt and using the pushing and pulling force, which has been widely used in the past.
Some attempts are made to adjust the method of manually rotating a bolt by an operator using a rotation imparting body such as a motor. In addition, with this device, the thickness data from the thickness gauge that is continuously measured in the width direction and the target thickness data are processed by a computer to determine the width direction position to be adjusted and the adjustment action amount. In other words, determine how many rotations (including forward and reverse rotations) to give to each of the numerous adjustment bolts provided in the slit part of the cap,
A method has been proposed in which the slit gap is adjusted using the aforementioned rotation imparting body.

However, the automatic nozzle adjustment device typified by the method described above functions effectively when the width at the nozzle discharge part of the film or plate-like material and the width at the product part do not differ greatly; When stretching the plate-like material in the longitudinal and transverse directions to improve its mechanical properties, the film or the plate-like material shrinks or expands in the width direction during the stretching process, and the degree of this decreases in the width direction. It does not function effectively because it differs in terms of In particular, when stretching a membrane or plate-like material in the width direction, hold both ends with clips, etc., and run the clip on a rail arranged in a widening manner. It is necessary to use gripping force to maintain the thickness of the membrane or plate-like object at a level that does not break during the stretching process, and this problem becomes more important as the membrane is thinner.

In other words, conventionally proposed membrane or plate manufacturing equipment equipped with an automatic mouthpiece adjustment device cannot be used as is if it is impossible to control the thickness level of the membrane or plate to be uniform across the entire width. cannot be used. Therefore, its use is limited to the product area excluding both ends of the stretched membrane or plate.

In addition, magnetic recording films, such as recent magnetic tapes, are becoming thinner and thinner to improve recording density, and there is a strong demand for uniform thickness levels. Manual adjustment, which depends on skill level, cannot handle the problem, and the need for automatic adjustment has been highlighted.However, as the thickness becomes thinner, the more the film breaks during the manufacturing process, the majority of the causes are This has been linked to film damage at the clip gripping portion during lateral stretching. In other words, it is impossible to adjust the thickness of both ends of the stretched film with a conventional automatic adjustment device that is limited only to the product section. It cannot be called an automatic nozzle adjustment device in the true sense of the word.

The purpose of the present invention is to eliminate the drawbacks of the prior art described above, and to
It is an object of the present invention to provide a manufacturing device that can automatically and easily manufacture membranes or plate-shaped objects of excellent quality that do not cause breakage in their gripping portions.

The structure of the present invention that achieves the above object includes a mouthpiece for discharging a molten substance in the form of a film or a plate, a slit adjustment mechanism of the mouthpiece, and a mechanism for adjusting the distance between the slits of the mouthpiece, and a direction in which the film or plate-like material discharged from the mouthpiece is directed. A longitudinal stretching device for stretching and a lateral stretching device for stretching in the width direction are arranged in this order, as well as a thickness gauge for measuring the thickness of the discharged material, and a thickness level sent from the thickness gauge in advance. A film or plate manufacturing apparatus comprising: a computer that calculates a deviation from a set target thickness level and instructs the slit adjustment mechanism of the mouthpiece to adjust the amount; (a) the thickness gauge comprises: , a plurality of thickness gauges comprising a thickness gauge for measuring the thickness of the end of the membrane or plate-like object, and a thickness gauge for measuring the product part, A thickness gauge for measuring the thickness is placed at the front of the longitudinal stretching device or at the front of the horizontal stretching device, and a thickness gauge for measuring the product section is placed at the rear of the horizontal stretching device. This is an apparatus for producing a film or a plate-like material.

That is, the present invention clarifies the required characteristics of each of the central portion and both end portions of the stretched film. An automatic die adjusting device for molding a stretched film or a plate-like object needs to control the product part and both end parts to different target thickness levels. In the product section, the goal is to achieve a uniformly flat thickness level except for special cases, and at the edges, taking into account the shrinkage and expansion in the width direction that occurs during the stretching process, we take measures to prevent breakage during stretching. The target thickness is set to a level that allows stable production without any problems. That is,
More specifically, the present invention is a film or plate manufacturing apparatus that is equipped with an automatic mouthpiece adjustment device that has separate thickness gauges for the product section and both ends.

Hereinafter, the present invention will be explained in more detail based on the drawings.

The figure is a schematic diagram showing an embodiment of the film or plate-like product manufacturing apparatus according to the present invention, which is equipped with an automatic mouthpiece adjustment device. 2 and fed into an automatic mouthpiece 3 equipped with an automatic gap adjustment mechanism between the slit opening and the slit. The molten film 4a discharged from the automatic mouthpiece 3 is cooled and solidified by a chill roll device 5 to form an unstretched film 4b, and then a longitudinal stretching device 6 stretches the film in the longitudinal direction using the difference in circumferential speed between the heating and cooling roll groups. The longitudinally stretched film 4c is then laterally stretched by a transverse stretching device 7 which holds both ends of the film 4c with clips running on rails disposed in a widening manner. A winder 8 winds up the film 4d.

In the above, the automatic cap adjustment device includes a thickness gauge 9 that mainly measures the thickness of both ends of the film;
a thickness gauge 10 that mainly measures the thickness of the product part;
A computer that calculates the deviation between the thickness level measured by each thickness gauge and each preset target thickness level, and instructs the slit gap adjustment mechanism of the automatic cap 3 to adjust the adjustment position and adjustment amount. 1
1.

That is, by independently installing the thickness gauges 9 at both ends and the thickness gauge 10 at the product section, it becomes possible to control each target thickness level. In this embodiment, the positions of the thickness gauges 9 at both ends are as follows:
Although the film 4c after longitudinal stretching was arranged to be measured, an unstretched film 4b may also be measured. Further, by separately installing thickness gauges at both ends and controlling each independently, more advanced control becomes possible.

On the other hand, the thickness gauge 10 in the product section was installed after the transverse stretching device 7 as shown in the figure.

In addition to the conventional automatic cap 3, we also have the U.S. Patent No. 3, which utilizes thermal expansion.
There is no problem with the one described in the specification of No. 3940221. In addition, focusing on the difference in thickness level between the product part and both ends, we installed the automatic adjustment mechanism described in the above US patent specification in the product part and the automatic adjustment mechanism described in Japanese Patent Publication No. 55-38249 for both ends. It is also possible to use them together.

The technical point of the present invention is that when there are multiple required target levels, each of them is controlled independently, and by making them independent, advanced thickness control is possible. ing.

In this example, we focus on the difference in adjustment targets in the width direction of a stretched film or plate-like object, and focus on an application example in which a high level of thickness is achieved by controlling each part in the width direction separately and independently. However, for example, in the case of a composite film or plate-like material that is composited in the thickness direction, a thickness meter that can focus on the thickness direction and measure the thickness level of a single composite base material is required. It is also possible to form a more advanced composite membrane or plate-like product by installing a number corresponding to multiple layers and adjusting the thickness level of each base material independently.

As described above, the film or plate-like product manufacturing apparatus according to the present invention includes a die for discharging a molten substance in the form of a film or a plate, a slit gap adjustment mechanism of the die, and a film or plate-like product discharged from the die. A longitudinal stretching device that stretches the plate-like object in its running direction and a horizontal stretching device that stretches it in the width direction are arranged in this order, and
A thickness gauge is used to measure the thickness of the discharged material, and the deviation between the thickness level sent from the thickness gauge and a preset target thickness level is calculated, and an adjustment amount is applied to the slit adjustment mechanism of the mouthpiece. In an apparatus for manufacturing a film or plate-like product, the apparatus includes: (a) the thickness gauge measures the thickness of the end of the film or the plate-like product; (b) The thickness gauge for measuring the thickness of the end portion is located at the front of the longitudinal stretching device or the front of the lateral stretching device. The thickness gage that measures the product part is installed in the membrane or plate manufacturing device, which is placed at the rear of the lateral stretching device.
The thickness of the membrane or plate-like material at the end portion and the product portion can be independently and precisely controlled to a predetermined thickness level.

B The thickness gauge was installed at the front of the longitudinal stretching device or the front of the lateral stretching device, and at the rear of the lateral stretching device, so the end of the membrane or plate before entering the lateral stretching process was The thickness can be automatically controlled in advance to a sufficient level that no breakage occurs due to the gripping force of clips, etc., and prevents film tearing in the transverse stretching device, that is, film tearing due to being too thin, and vice versa. The disadvantage of reduced production efficiency due to excessive thickness can be easily resolved, and the thickness gauge at the end is placed at the front side of the transverse stretching device, so the thickness gauge is placed at the rear of the transverse stretching device. It is closer to the mouthpiece than the other way around, which improves feedback control.

Furthermore, because the thickness gauge of the product section is placed at the rear of the horizontal stretching device, the thickness unevenness of the product section due to temperature unevenness that occurs in the longitudinal stretching device and the horizontal stretching device can be reduced to the uniform thickness level required for the final product. After automatically adjusting the winding speed, the winding machine can wind the winding machine.

Therefore, according to the manufacturing apparatus of the present invention, it is possible to easily manufacture a film or plate-like product of a predetermined thickness and excellent quality without causing breakage.

[Brief explanation of the drawing]

The figure is a schematic diagram showing one embodiment of the device according to the invention. Explanation of symbols in the drawings, 1: extruder, 2: conduit,
3: mouthpiece, 5: chill roll device, 6: longitudinal stretching device, 7: lateral stretching device, 8: winding machine.

Claims (1)

[Claims] 1. A mouthpiece for discharging a molten substance in a film or plate shape;
A slit-to-slit adjustment mechanism of the die, a longitudinal stretching device for stretching the film or plate-like material discharged from the die in its running direction, and a transverse stretching device for stretching it in the width direction are arranged in this order, and , a thickness gauge that measures the thickness of the discharged material, and calculates the deviation between the thickness level sent from the thickness gauge and a preset target thickness level, and applies the adjustment amount to the slit adjustment mechanism of the mouthpiece. (b) The thickness gauge measures the thickness of the edge of the membrane or plate, and the product section. (b) The thickness gauge for measuring the thickness of the end portion is located at the front of the longitudinal stretching device or the front of the lateral stretching device. An apparatus for producing a membrane or plate-like article, wherein a thickness gauge for measuring the product portion is disposed at a rear part of the lateral stretching device.