JP2005288738A - T-die and outer inner dekker rod for t-die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a T-die which minimizes the leakage of a resin from a rib part and prevents the occurrence of saddles at both ends of a formed resin film independent of the kind and property of the resin and an outer inner Dekker rod for the T-die. <P>SOLUTION: The outer inner Dekker rod for the T-die is composed of a rod made of a column or a cylinder, a plate-like lengthy flag integrated with the lower part of the rod, and a lengthy Dekker having a rectangular cross section which is integrated with the lower part of the lengthy flag, and the lengthy flag is integrated over its whole length with the lower surface in the longitudinal direction of the rod on the upper surface in the longitudinal direction and is integrated over its whole with the upper surface in the longitudinal direction of the lengthy Dekker on the lower surface in the longitudinal direction. The T-die uses the outer inner Dekker rod. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a T-die used when a film is formed from a synthetic resin such as polyethylene, and more specifically, the T-die that eliminates resin leakage from the lip portion as much as possible and prevents the occurrence of ear heights at both ends of the formed film. The present invention relates to an outer inner deck rod for dies and T dies.

  As a main method for forming a thermoplastic resin film such as polyethylene or polypropylene, there are a T-die method and an inflation method. Among these, the T-die method extrudes and molds a resin film such as polyethylene, superimposes it with metal foil, cellophane paper, kraft paper, etc. while it is hot, presses with a roll, laminates it, and fertilizer bags, vibration-proof bags It is used for making and widely used for packaging materials such as medicine packaging materials and food packaging materials.

  In this T-die, means for adjusting the extrusion width is indispensable. As the means for adjusting the extrusion width, there are roughly divided into an inner deckle method and an outer deckle method. In the inner deckle method, for example, a deckle is arranged at the round part of the T die, and a deckle rod is arranged at the lower end of the round part, and the resin width is regulated by this deckle and deckle rod while preventing leakage of the molten resin. Is. On the other hand, in the outer deckle method, for example, a jig is attached to the outer surface of the lip portion of the T die with a mounting bracket, and the seal portion in the jig is closely attached to the lip to regulate the resin width and prevent resin leakage. Is intended.

  FIG. 8 is a schematic cross-sectional view of the front portion showing an example of the inner deckle method, and FIG. 9 is an enlarged view of the deckle portion. 8 and 9, 5 is an extruder, 6 is a T-die body, 7 is a manifold portion, 8 is a round portion, 9 is a lip portion, 10 is a resin film, 11 is an embedded deck support rod, 12 is an embedded deck, 14 Indicates a deckle rod, and 15 indicates a flagged deckle rod.

  8 and 9 includes an embedded deckle 12 held by an embedded deckle support bar 11 provided in the manifold portion 7, a deckle rod 14 provided at a lower end inclined portion of the round portion 8, and a flagged deckle rod 15; The resin width is adjusted and finely adjusted to extrude the resin film 10.

  However, even with such a T-die, depending on the type of resin, ear heights are generated at both ends of the resin film obtained based on the neck-in. The ear-high portions at both ends must be removed after winding the resin film, which is extremely disadvantageous economically. There are more than 10 types of resins used for T-die, such as low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate resin, and polypropylene, and there are colored masterbatch resins. The size of each is also different. Under such circumstances, no T-die has been obtained in which no ear height is generated at both ends of the resin film obtained by using any resin.

  Further, in such a T-die, there is a problem that the resin is accumulated in the deckle rod portion and the resin leaks from the portion. The leaked resin falls and adheres to the obtained resin film. Resin leakage may occur 2-3 times per hour, and the resin adhering to the resin film is extremely problematic in terms of product quality. That is, if there is a resin leak, static electricity is generated when the resin film is wound up, and the leaked resin enters the product, causing a complaint. For this reason, the operator removes the adhering resin by using a removing tool, but this operation is the most dangerous and may cause a hand to be caught in a roll such as a nip roll.

  On the other hand, in the outer deckle method, since the deckle is attached to the lip outlet, the air gap from the die to the roll becomes inevitably long, and there is a problem that the occurrence of an ear height cannot be avoided. Also, there is a problem that resin leakage occurs as in the case of the inner deckle method.

  As a proposal for solving such a problem, Patent Document 1 proposes a T-die using a combination of a specific-shaped inner deck and an outer deck.

JP-A-8-52783

  However, even when the T-die described in Patent Document 1 was used, depending on the type of resin used, ear heights occurred at both ends of the obtained resin film, and resin leakage occurred.

  On the other hand, Patent Document 2 describes a lip lower surface cleaning device of a T-die device in which a spear removal body is formed on a bottom surface of a rod rod with a spatter, and the lower surface of the lip can be slid as the spear removal body. A rod-shaped body is described.

JP 2000-25089 A

  However, the spear remover described in Patent Document 2 is provided only on the bottom surface of the grouper, and its purpose is to remove the spear (fixed resin) generated on the bottom surface of the lip. It does not prevent the occurrence of film heights and eliminates resin leakage from the lip as much as possible.

Accordingly, an object of the present invention is to provide a T-die that eliminates resin leakage from the lip portion as much as possible regardless of the type and properties of the resin and prevents the occurrence of ear heights at both ends of the molded resin film, and the T-die. An object of the present invention is to provide an outer inner deckle rod for a T-die used.

  As a result of the study, the present inventors have found that the present invention can be reached by using a specific outer inner deckle rod in addition to the embedded deckle and the like.

That is, in the present invention (1), a rod made of a columnar body or a cylindrical body, a plate-like long flag integrated in the lower portion of the rod, and a cross section integrated in the lower portion of the long flag are vertically long. A long deckle that is rectangular, and the long flag is integrated over the entire length with the lower surface in the longitudinal direction of the rod at the upper surface in the longitudinal direction, and the longitudinal direction of the long deckle at the lower surface in the longitudinal direction An outer inner deckle rod for a T-die characterized by being integrated over the entire upper surface and length.

The present invention (2) also provides the outer inner deckle rod for T-die, wherein the rod has a polygonal, circular or reverse droplet cross section.

Further, the present invention (3) provides the outer inner deckle rod for T-die, wherein the tip end portion has an acute inclination toward the lower surface with respect to the longitudinal direction.

  Further, the present invention (4) provides the outer inner deckle rod for a T die, the tip of which is perpendicular to the longitudinal direction.

  Further, in the present invention (5), the ratio of the longitudinal length (a) of the rod and the longitudinal length (b) of the long deckle is 1: 1.2 to 3.0. An outer inner deck rod for a T-die is provided.

Further, the present invention (6) is a T die having a manifold part, a round part and a lip part through which a molten resin flows, and having a deckle on the round part,
It consists of a rod made of a columnar body or a cylindrical body, a plate-like long flag integrated in the lower part of the rod, and a long dekel whose section integrated in the lower part of the long flag is a vertically long rectangle. The long flag is integrated with the longitudinal lower surface of the rod over the entire length on the longitudinal upper surface thereof, and is integrated with the longitudinal upper surface of the elongated deckle over the entire length with the longitudinal lower surface. An outer inner deckle rod is provided, the rod is fitted to the inclined portion at the lower end of the round portion, and the long flag is arranged so as to project the lip portion outlet from the upper portion of the lip portion. A T-die is provided.

  Further, the present invention (7) provides the T-die in which the rod has a polygonal, circular, or reverse droplet shape in cross section.

  In addition, the present invention (8) provides the T die in which the tip end portion of the outer inner deckle rod has an acute inclination toward the bottom surface with respect to the longitudinal direction.

  Further, the present invention (9) provides the above-mentioned T die in which the tip end portion of the outer inner deckle rod is perpendicular to the longitudinal direction.

  In the invention (10), the ratio of the longitudinal length (a) of the rod to the longitudinal length (b) of the long deckle is 1: 1.2 to 3.0. Provide a die.

The T-die using the outer inner deckle rod for T-die according to the present invention eliminates resin leakage from the lip portion as much as possible regardless of the type and properties of the resin, and generates the ear height at both ends of the molded film. Can be prevented.

Hereinafter, the best mode for carrying out the present invention will be described.
FIG. 1 is a cross-sectional view showing a first embodiment of an outer inner deckle rod for a T die according to the present invention, and FIG. 2 is a perspective view of a tip portion thereof. FIG. 3 is a cross-sectional view showing a second embodiment of the outer inner deckle rod for T die according to the present invention, and FIG. 4 is a perspective view of the tip portion thereof.

  An outer inner deckle rod 1 according to the present invention includes a rod 2, a long flag 3 integrated with the lower portion of the rod, and a long deckle 4 integrated with the lower portion of the long flag.

  The rod 2 is formed of a columnar body or a cylindrical body, and the cross section thereof is a polygon, a circle, a reverse droplet shape, or the like. In the first embodiment shown in FIGS. 1 and 2, the cross-section is a funnel-shaped hexagon, and in the second embodiment shown in FIGS. These cross-sectional shapes and sizes thereof need to be shapes and sizes that can be fitted to the inclined portion at the lower end of the round portion of the T die.

The long flag 3 is plate-shaped. The length (c) of the long flag 3 in the vertical direction needs to be long enough to project the lip exit from the upper part of the lip of the T die.

The long deckle 4 has a vertically long rectangular cross section, and is arranged below the lip portion outlet of the T die. The longitudinal length (b) of the long deckle 4 is such that the ratio of the longitudinal length (a) of the rod 2 to the longitudinal length (b) of the long deckle 4 is 1: 1.2. It is necessary to make the length to be -3.0. The lateral length (e) of the long deckle 4 is preferably substantially the same as the lateral length (maximum length) (d) of the rod 2, and the lateral length of the long flag 4 About 3.0 to 7.0 times the thickness (f) is preferable.

Further, the long flag 3 is integrated over the entire length with the lower surface in the longitudinal direction of the rod 2 at the upper surface in the longitudinal direction, and is integrated with the upper surface in the longitudinal direction of the long deckle 4 at the lower surface in the longitudinal direction. Has been. In this way, the rod 2, the long flag 3 and the long deckle 4 are integrated over the entire length in the longitudinal direction, and the overall integration is obtained when they are arranged on the T-die. This is to prevent the height of the resin film from being generated and to prevent resin leakage as much as possible.

In the first embodiment of the present invention, as shown in FIG. 2, the distal end portion of the outer inner deckle rod 1 is inclined at an acute angle with respect to the longitudinal direction, that is, from the rod 2 toward the long deckle 4. have. The inclination angle at this time is preferably (α) 30 to 60 degrees. On the other hand, in 2nd embodiment of this invention, as FIG. 4 shows, the front-end | tip part of the outer inner deck rod 1 is a right angle with respect to a longitudinal direction. In the outer inner deckle rod according to the present invention, the tip portion may be in any form, but the first embodiment shown in FIG. 2 is preferable in order to achieve the object of the present invention more effectively.

The outer inner deckle rod 1 according to the present invention is composed of the rod 2, the long flag 3 and the long deckle 4 as described above, and these are integrally formed. This outer inner deckle rod 1 is made of phosphor bronze or the like in consideration of strength, heat resistance and the like.

An example of a preferable cross-sectional dimension of the outer inner deckle rod 1 of the first embodiment shown in FIG. 1 is as follows.
Rod 2: Horizontal length (d) of upper rectangular part (d) 3.5 mm, vertical length 5.0 mm, horizontal upper base 3.5 mm, lower base 0.7 mm, vertical direction of lower inverted trapezoidal part, vertical direction Length of 2.4 mm, overall length in the vertical direction (a) 7.4 mm
Long flag 3: horizontal length (f) 0.7 mm, vertical length (c) 3.0 mm
Long deckel 4: horizontal length (e) 3.5 mm, vertical length (b) 10.0 mm

An example of a preferable cross-sectional dimension of the outer inner deckle rod 1 of the first embodiment shown in FIG. 3 is as follows.
Rod 2: Maximum lateral length (d) 2.65 mm, upper longitudinal length 1.325 mm, lower longitudinal length 2.04 mm, overall longitudinal length (a) 3.365 mm
Long flag 3: horizontal length (f) 0.7 mm, vertical length (c) 3.0 mm
Long deckel 4: horizontal length 3.5 mm (e), vertical length (b) 10.0 mm

FIG. 5 is a schematic longitudinal sectional view of a front portion showing an embodiment of a T die according to the present invention, FIG. 6 is an enlarged view of the deckle portion of FIG. 5, and FIG. 7 is a round of the T die shown in FIG. It is a partial cross-sectional view of a part and a lip part.

In the T die shown in FIGS. 5 to 7, the molten resin extruded from the extruder 5 passes through the manifold portion 7, the round portion 8, and the lip portion 9 of the T die body 6, and the resin film 10 is extruded from the lip portion outlet. Is done.

As shown in FIGS. 6 and 7, the resin width is adjusted and finely adjusted, as shown in FIGS. 6 and 7. Is moved in the lateral direction of the T die 6. The rod 2 of the outer inner deckle rod 1 is fitted to the inclined portion at the lower end of the round portion 7, and the long flag 3 is disposed so as to project the lip portion outlet from the upper portion of the lip portion 8. Move horizontally. In the present invention, instead of the long deckle 13, a conventionally used deckle rod with flag (see FIGS. 8 and 9) may be used.

By providing the outer inner deckle rod 1 on the T die 6 in this way, the following operations and effects are achieved. That is, since the outer inner deckle rod 1 has a constant weight and is stably positioned, the outer inner deckle rod 1 is not displaced due to the pressure of the molten resin, so that the resin leakage from the lip portion 9 hardly occurs. In addition, since the long deckle 4 having a vertically long cross section not only adjusts and finely adjusts the resin width, but also functions as a heat sink, the leaked resin is cooled and becomes a fixed resin, so that the resin adheres to the resin film. As a result, it can be prevented.

  The outer inner deckle rod for T-die according to the present invention and the T-die using the same eliminate the resin leakage from the lip as much as possible regardless of the type and properties of the resin, and the height of the ends of the molded resin film. Can be prevented. Accordingly, since the removal of the adhering resin from the resin film and the blowers at both ends can be largely avoided, not only the productivity is remarkably improved but also extremely economically advantageous.

FIG. 1 is a cross-sectional view showing a first embodiment of an outer inner deckle rod for a T die according to the present invention. FIG. 2 is a perspective view of the tip end portion of the outer inner deckle rod for T die shown in FIG. FIG. 3 is a cross-sectional view showing a second embodiment of an outer inner deckle rod for a T die according to the present invention. FIG. 4 is a perspective view of the tip end portion of the outer inner deckle rod for T die shown in FIG. FIG. 5 is a schematic longitudinal sectional view of a front portion showing an embodiment of a T die according to the present invention. FIG. 6 is an enlarged view of the deckle portion of the T die shown in FIG. FIG. 7 is a partial cross-sectional view of the round part and the lip part of the T die shown in FIG. FIG. 8 is a schematic longitudinal sectional view of a front portion showing an example of a conventional T die. FIG. 9 is an enlarged view of the deckle portion of the T die shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer inner deck rod 2 Rod 3 Long flag 4 Long deck 5 Extruder 6 T die body 7 Manifold section 8 Round section 9 Lip section 10 Resin film 11 Embedded deck support rod 12 Embedded deck 13 13 Decks 14 deck 15 Rod Deckle rod with

Claims (10)

It consists of a rod made of a columnar body or a cylindrical body, a plate-like long flag integrated in the lower part of the rod, and a long dekel whose section integrated in the lower part of the long flag is a vertically long rectangle. The long flag is integrated with the longitudinal lower surface of the rod over the entire length on the longitudinal upper surface thereof, and is integrated with the longitudinal upper surface of the elongated deckle over the entire length with the longitudinal lower surface. Outer inner deckle rod for T-die characterized by 2. The outer inner deckle rod for a T-die according to claim 1, wherein the rod has a polygonal shape, a circular shape, or a reverse droplet shape. The outer inner deckle rod for a T-die according to claim 1 or 2, wherein the tip portion has an acute inclination toward the lower surface with respect to the longitudinal direction. The outer inner deck rod for T-die according to claim 1 or 2, wherein the tip portion is perpendicular to the longitudinal direction. The ratio between the longitudinal length (a) of the rod and the longitudinal length (b) of the long deckle is 1: 1.2 to 3.0. Outer inner deckle rod for T-die. A T-die having a manifold part, a round part and a lip part through which a molten resin flows, and a deckle provided in the round part
It consists of a rod made of a columnar body or a cylindrical body, a plate-like long flag integrated in the lower part of the rod, and a long dekel whose section integrated in the lower part of the long flag is a vertically long rectangle. The long flag is integrated with the longitudinal lower surface of the rod over the entire length on the longitudinal upper surface thereof, and is integrated with the longitudinal upper surface of the elongated deckle over the entire length with the longitudinal lower surface. An outer inner deckle rod is provided, the rod is fitted to the inclined portion at the lower end of the round portion, and the long flag is arranged so as to project the lip portion outlet from the upper portion of the lip portion. T-die. The T-die according to claim 6, wherein the rod has a polygonal, circular, or reverse droplet shape in cross section. The T die according to claim 6 or 7, wherein a tip end portion of the outer inner deckle rod has an acute inclination toward a lower surface direction with respect to a longitudinal direction. The T die according to claim 6 or 7, wherein a tip portion of the outer inner deckle rod is perpendicular to the longitudinal direction. The ratio of the longitudinal length (a) of the rod to the longitudinal length (b) of the long deckle is 1: 1.2 to 3.0. T-die.