JP2013180558A - Slot die system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slot die system, capable of stably molding a resin film with the film thickness thereof being uniform.SOLUTION: A slot die system includes: inner deckles and a squeezing member provided at both ends of a slot die, and the slot die for molding a molten resin in a film shape by supplying the molten resin to a manifold and passing the resin through a slot provided in a downstream part of the manifold. The slot die system further includes: a means for alternately measuring positions of the inner deckles 11, 12 and squeezing member 13 provided at both ends of the slot die 1; a means for measuring the film thickness of a molded film; a measure for acquiring and accumulating the alternately measured position data and film thickness data; and a means for adjusting the positions of the inner deckles and squeezing member provided at both ends of the slot die based on the film thickness data.

Description

  The present invention relates to a system for molding a resin film using a slot die, and more particularly to a slot die system for uniformly molding the thickness of a resin film.

  Conventionally, when a resin film is molded using a slot die, a non-uniform film thickness distribution is generated in the molded resin film, causing problems such as poor quality and poor appearance. As a method for eliminating the non-uniform film thickness distribution, there are modification of the die shape, modification of the Dickel shape, optimization of the Dickel arrangement, etc., and these methods are used together as appropriate.

  For example, in Patent Document 1, molten resin is supplied from a manifold portion formed on a die body, extruded from a lip outlet through a die land portion and a lip land portion, and a sheet or film widened to a target width is formed. In the T-die for extrusion molding, the lip outlet end is disposed on the inner surface of a pair of inner deckles that are slidably disposed in the manifold portion, die land portion, and lip land portion of the die body, and can be adjusted to be spaced apart from each other. There is disclosed an extrusion-molding T-die provided with an edge-squeezing part that restricts the resin flow rate at the edge part.

  According to this extrusion forming T-die, the flow rate of the resin at the edge portion of the resin film is reduced by the edge drawing portion, and the left and right edge portions of the resin sheet have a circular cross section when discharged from the lip outlet. Swelling can be suppressed.

  Further, Patent Document 2 includes a die body in which a lip forming a discharge portion of a resin discharge slot is provided along a longitudinal direction, and a deckle mechanism that is attached to the lip and defines an opening width of the slot. In the extrusion die for film forming, the deckle mechanism is composed of a pair of left and right deckle components that move toward and away from each other along the lip, and each deckle component has an inner surface that is in contact with the front end surface of the lip. An extrusion die for forming a film is clearly shown, which is composed of a kel and a plate-shaped inner deckle that is raised substantially vertically from the inner surface of the outer deckle and is packaged in a slot.

  Furthermore, Patent Document 3 proposes a Dickel shape that increases the flow velocity on the end side in the width direction of the molten resin discharged from the discharge portion of the slot and suppresses the end portion of the resin film from becoming thick.

JP 2002-192594 A JP 2001-030330 A JP 2011-73156 A

  However, it is difficult to always maintain the same production conditions at the production site because the conditions shown in the above document are always performed at the production site because of fluctuations in the site environment and adjustment errors of workers. A film with a constant and uniform thickness cannot be produced stably.

  This invention is made | formed in view of the situation mentioned above, and it aims at providing the slot die system which can shape | mold the film thickness of a resin film uniformly and stably.

In order to achieve the above object, an invention according to claim 1 of the present invention includes an inner deckle and a throttle member provided at both ends of a slot die, supplies molten resin to the manifold, A slot die system using a slot die that passes through a provided slot and forms into a film shape,
Means for alternately measuring the positions of the inner deckle and the throttle member provided at both ends of the slot die;
Means for measuring the film thickness of the molded film;
Means for acquiring and accumulating the alternative measured position data and film thickness data;
A slot die system comprising: inner deckles provided at both ends of the slot die based on the film thickness data; and means for adjusting the position of the throttle member.

  In the present invention, by alternately measuring the position of the inner deckle and the drawing member inside the slot die, and further measuring the film thickness of the formed film, it becomes possible to prevent poor adjustment of the worker, as a result, Production of a film with a uniform film thickness can be continued, and quality variations can be suppressed.

  In addition, if quality defects occur by accumulating the position and film thickness data of the inner deckle and the diaphragm member, the cause of the defect occurrence is determined by the accumulated position and film thickness data of the inner deckle and diaphragm member. It can be grasped and the occurrence of defective products can be suppressed by eliminating the cause of the occurrence of defects.

The figure which shows the structure of the slot die system of this invention. The figure which shows an example of the slot die applied to the slot die system of this invention. (A) is a figure which shows a cross section. (B-1) is a figure which shows the broken-line part 101-2 of FIG. (B-2) is a figure which shows the broken-line part 101-1 of FIG. (C) is a figure which shows the cross section of the AA line of Fig. (A). The figure for demonstrating the alternative measurement of the position of the 1st inner deckle which concerns on this invention, the 2nd inner deckle, and an aperture member. (A) is a figure which shows the case where the position of the 1st inner deckle of the right end, the 2nd inner deckle, and the aperture member is measured alternatively. (B) is a figure which shows the case where the position of the 1st inner deckle of the left end, the 2nd inner deckle, and the aperture member is measured alternatively.

  Hereinafter, embodiments of the slot die system of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing the configuration of the slot die system of the present invention. The slot die system of the present invention measures the film thickness of the molded film 100 and the position measuring unit 18 which is a means for measuring the positions of the inner deckles at both ends (not shown) provided on the slot die 1 and the positions of the drawing members. Film thickness measuring device 17 as means, personal computer 16 as means for acquiring and accumulating measured position data and film thickness data, inner deckles and diaphragm members provided at both ends of the slot die from the film thickness data. And a position adjusting mechanism 19 which is a means for adjusting the position.

  FIG. 2 is a view showing an example of a slot die to which the slot die system of the present invention is applied. 2A is a cross-sectional view, and FIG. 2B-1 is a detailed view of the broken line portion 101-2 of FIG. 2A, which defines the lengths of the manifold 3 and the slot 4 in the width direction. It is a figure which shows the mechanism 6-2. FIG. 2B-2 is a view showing the broken line portion 101-1 in FIG. 2A in detail, and showing the mechanism 6-1 that defines the lengths of the manifold 3 and the slot 4 in the width direction. FIG.2 (c) is a figure which shows the cross section of the AA line of Fig.2 (a). As shown in FIG. 2 (a), the slot die 1 is formed in the slot die body 2 and in the slot die body 2 so as to communicate with the manifold 3, and the molten resin R1 in the manifold 3 passes and is formed into a film shape. Slot 4, a lip outlet 5 that discharges the film-like molten resin R 1 that has passed through the slot 4, and mechanisms 6-1 and 6-2 that define the length in the width direction of the manifold 3 and the slot 4. ing.

  The slot die body 2 has a supply port 2a for the molten resin R1 at the top, and the supply port 2a is connected to an adapter (not shown) that supplies the molten resin R1. The slot die body 2 has an outer shape elongated in the width direction of the resin film R2 to be molded. The manifold 3 is formed in a cylindrical shape over the width direction of the slot die body 2, and the supply port 2a of the slot die body 2 is connected to the upper part of the intermediate portion in the width direction, and the molten resin R1 is supplied from the supply port 2a. Supplied.

  The slot 4 is formed on the lower side of the manifold 3 over the width direction of the slot die body 2. The lip outlet 5 is formed at the lower end of the slot die body 2 and is located at the lower end of the slot 4.

  2 (b-1) and 2 (b-2), the mechanisms 6-1 and 6-2 for defining the length in the width direction of the manifold 3 and the slot 4 are the Provided at both ends in the width direction, from the first inner deckles 11-1 and 11-2, the second inner deckles 12-1 and 12-2, and the aperture members 13-1 and 13-2 Composed. The first and second inner deckles 11-2 and 12-2 and the diaphragm member 13-2 provided at the left end shown in FIG. 2B-1 are arranged from top to bottom in this order. Similarly, the first and second inner deckles 11-1 and 12-1 and the diaphragm member 13-1 provided at the right end shown in FIG. 2B-2 are arranged in this order from top to bottom. Yes. The first inner deckles 11-1 and 11-2, the second inner deckles 12-1 and 12-2, and the throttle members 13-1 and 13-2 have a width within the manifold 3 and the slot 4. The dimensions of the manifold 3 and the slot 4 in the width direction are defined by the surfaces 11-1a, 11-2a, 12-1a, 12-2a, 13-1a, 13-2a. . The molten resin R1 supplied to the slot die body 2 is guided by this surface, passes downward, and is discharged from the lip outlet 5 in the form of a curtain.

  FIG. 2 shows the case of two inner deckles (for example, 11-1 and 12-1) of a pair of first inner deckle and second inner deckle. Depending on the degree, one inner deckle may be used.

  The first inner deckle 11-2 at the left end shown in FIG. 2 (b-1) is located on the upper side of the manifold 3 and the slot 4 and moves the first inner deckle position adjusting bar 11-2b. Defines the dimensions in the width direction on the upper side of the manifold 3 and the slot 4. The surface 11-2a of the first inner deckle 11-2 is inclined or curved so as to increase the dimension in the width direction of the manifold 3 and the slot 4 from the upper side to the lower side. Further, the second inner deckle 12-2 is located on the downstream side of the slot 4, and by moving the second inner deckle position adjustment bar 12-2b, the size in the width direction on the lower side of the slot 4 is adjusted. It prescribes. The surface 12-2a of the second inner deckle 12-2 is inclined or curved so as to widen the dimension in the width direction of the slot 4 from the upper side to the lower side. Further, the throttle member 13-2 is located on the downstream side of the slot 4, and by moving the throttle member 13-2 itself, the width direction dimension on the lower side of the slot 4 is regulated, so that the width of the lip outlet 5 is increased. Defines the dimensions in the direction.

  Contact surfaces 11-2a and 12-2a of the first and second inner deckles 11-2 and 12-2 with the molten resin R1 provided at the left end shown in FIG. In the cross section, either a convex shape or a concave shape may be used.

  Similarly, contact surfaces 11-1a and 12-1a of the first and second inner decks 11-1 and 12-1 with the molten resin R1 provided at the right end shown in FIG. 2 (b-2). May have either a convex shape or a concave shape in a horizontal cross section.

  A method of forming a resin film by the slot die having the above-described configuration of the present invention will be described with reference to FIG. First, the molten resin R1 is supplied to the slot die body 2 from the supply port 2a. The molten resin R1 flows into the manifold 3, spreads in the width direction of the manifold 3, and flows into the slot 4 below. The molten resin R1 passes through the slot 4 and is formed into a film having a predetermined thickness. Then, the molten resin R1 formed into a film in the slot 4 is discharged from the lip outlet 5, and while passing through the air, the molten resin R1 is cooled and gradually solidified to be in the state of the molten film R2, Rolling is performed by a roller (not shown) provided below (downstream side) the slot die apparatus 1. The roller is rotated at a speed faster than the speed at which the resin film R2 is discharged. When discharged from the lip outlet 5, the resin film R2 is not completely solidified, but is cooled and solidified by a roller portion or the like.

  In this case, since the resin film R2 discharged from the lip outlet 5 is not completely solidified, the end R2a contracts in the width direction, and the end R2a of the resin film R2 becomes thick. Later, the thickened end R2a is cut away to provide a resin film R2 having a uniform thickness.

  FIG. 3 is a view for explaining a method of measuring the positions of the inner deckle and the diaphragm member according to the slot die system of the present invention. FIG. 3A shows the case of the right end inner deckle and the diaphragm member, and FIG. 3B shows the case of the left end inner deckle and the diaphragm member.

  In the case of the rightmost inner deckle and the restricting member shown in FIG. 3A, the positions of the first inner deckle 11-1, the second inner deckle 12-1, and the restricting member 13-1 are set to the slot die. Since it is difficult to measure the position of the first inner deckle, the second inner deckle, and the throttle member as positions instead of the fixed portion 20-1 as a reference, the position adjustment for moving each of them is performed. The amount of protrusion of the bars 11-1b, 12-1b and the diaphragm member 13-1 (the movement of the diaphragm member 13-1 moves the diaphragm member 13-1 itself) is based on the fixed portion 20-1, that is, the arrow 111- The lengths indicated by 1, 112-1, and 113-1 are measured.

  Similarly, the positions of the first inner deckle 11-2, the second inner deckle 12-2, and the throttle member 13-2 at the left end shown in FIG. 3B are also difficult to measure inside the slot die. Therefore, the position adjustment bars 11-2b and 12-2b and the diaphragm member 13-2 (moving the diaphragm member 13-2 itself for moving the diaphragm member 13-2) for moving each of the position adjusting bars 11-2b and 12-2b are fixed to the fixing unit 20. −2 as a reference, the amount of protrusion of each of the position adjustment bars 11-2b, 12-2b and the diaphragm member 13-2 as an alternative to the position of the first inner deckel, the second inner deckel, and the diaphragm member, That is, the lengths indicated by the arrows 111-2, 112-2, and 113-2 are measured.

  Measurement of the pop-out amounts 111-1, 112-1, 113-1 and 111-2, 112-2, 113-2 should be automatically performed in order to reduce the work load on the operator and due to restrictions on the installation location. Is desirable. The automatic measurement method is not limited to a specific method. For example, the protruding portion can be imaged at regular intervals by an imaging camera, and the captured image can be measured by generally used image processing. It can also be achieved by a laser measuring method.

  As shown in FIG. 1, in the slot die system of the present invention, the resin film discharged from the slot die 1 is conveyed in the direction indicated by the arrow 101. A film thickness measuring device 17 is installed in the middle of the conveyance path, and film thickness data is measured as needed, and the measurement data is taken into the personal computer 16. As the film thickness measuring device 17, for example, an ultrasonic film thickness measuring device can be used.

  The pop-out amounts 111-1, 112-1, 113-1, and 111-2, 112-2, 113-2 are adjusted by the film thickness data acquired from the film thickness measuring device 17, and the variation in the formed film thickness is It is corrected. As for the adjustment amount, a part or all of the protrusion amounts 111-1, 112-1, 113-1 and 111-2, 112-2, 113-2 are adjusted depending on the film thickness variation, and the adjustment width and adjustment are adjusted. The object is derived from past measurement data. The jump-out amount after adjustment is taken into the personal computer 16. The taken-out amount can be reflected in the history of the subsequent product together with the measurement data.

  As described above, according to the slot die system according to the present invention, it becomes possible to stably perform production under uniform conditions, and even when quality defects occur, the quality of defects is determined from the pop-out amount and film thickness data. Since the cause can be known, it is possible to take immediate action, reduce waste of material costs, and increase the production efficiency of the slot die device.

DESCRIPTION OF SYMBOLS 1 ... Slot die 2 ... Slot die main body 2a ... Supply port 3 ... Manifold 4 ... Slot 5 ... Lip exit 6-1, 2 ... Specified width of manifold and slot The first inner deckle 11-1a, 2a ... the first inner deckle surface 12-1, 2 ... the second inner deckle 12-1a, 2a ... surfaces of the second inner deckle 13-1, 2 ... diaphragm members 13-1a, 2a ... surface 16 of the diaphragm member ... personal computer 17 ... film thickness measuring device 18 ... Position measuring unit 19 ... Position adjusting mechanism 20-1, 2 ... Fixing unit 100 ... Molded film 101-1, 2 ... Broken line 111-1, 2, indicating the range to be enlarged・ The first inner deckle position adjustment bar pops out Amount 112-1, 2 ... Amount of protrusion of the position adjusting bar of the second inner deckle 113-1, 2 ... Amount of protrusion of the squeezing member R1 ... Molten resin R2 ... Resin film R2a ...・ End of molded resin film

Claims (1)

The slot die is provided with an inner deckle and a squeezing member provided at both ends of the slot die, the molten resin is supplied to the manifold, and the slot die provided in the downstream portion of the manifold is passed through and formed into a film shape. A slot die system,
Means for alternately measuring the positions of the inner deckle and the throttle member provided at both ends of the slot die;
Means for measuring the film thickness of the molded film;
Means for acquiring and accumulating the alternative measured position data and film thickness data;
A slot die system comprising: inner deckles provided at both ends of the slot die from the film thickness data; and means for adjusting the position of the aperture member.

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