JP2005289025A - Film molding t-die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film molding T-die reduced in the force for adjusting the uneven thickness of a film and capable of precisely and finely adjusting the uneven thickness of the film. <P>SOLUTION: The film molding T-die is constituted so that narrow X- and Y-parts are formed by providing a plurality of oblong through-holes 10 to an adjusting jaw 3 and reducing the rigidity in the direction of a lip gap 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a T-die for film forming that has an adjustment jaw that slides and adjusts a lip gap, and that forms a molten synthetic resin supplied from an extruder into a film.

  When the molten resin supplied from the extruder is formed into a film, adjusting the lip gap by sliding the adjustment jaw of the T die has already adjusted the thickness variation of the film. Traditionally done.

As this type of T-die, for example, there is an example of a conventional T-die as shown in FIG.
An adjustment jaw 41 is attached to the block 40 in a slidable state, and the lip gap 43 is adjusted by an adjustment bolt 42 screwed with the block 40 to adjust the uneven thickness of the film 44.

        US Pat. No. 3,018,515

Problems to be solved by the invention

However, in the film-forming T-die having the above-described configuration, the adjustment jaw 41 has a large width indicated by Z, so that the rigidity when deforming in the direction of the lip gap 43 is large and hardly deformed. It cannot be finely deformed locally.
Accordingly, there is a problem that a large force is required to adjust the adjusting bolt 42 and that the thickness deviation of the film extruded from the lip gap 43 cannot be adjusted with high accuracy.

  Accordingly, an object of the present invention is to provide a T-die for forming a film that has a small force for adjusting the uneven thickness of the film and can adjust the uneven thickness of the film accurately and finely.

Means for solving the problem

In order to achieve the above object, the present invention has an adjustment jaw that slides and adjusts the lip gap, and a film forming T-die that forms a molten synthetic resin supplied from an extruder into a film.
The adjusting jaw is provided with a plurality of through holes.

  Thereby, the force for adjusting the uneven thickness of the film is small, the uneven thickness of the film can be adjusted finely with high accuracy, and the uneven thickness of the film is minimized.

  Hereinafter, the T-die for film forming of the present invention will be described in detail with reference to the accompanying drawings.

[Example]
FIG. 1 is a cross-sectional view of a film-forming T die showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-B in FIG.

As shown in FIGS. 1 and 3, the molten synthetic resin supplied to the film forming T-die 1 from an extruder (not shown) comes out as a molten film 12 from the lip gap 11.
The molten film 12 is cooled and solidified by a cooling roll (not shown).

  As shown in FIGS. 1 and 2, the film-forming T-die 1 has a fixed jaw 4 attached to a main body 2, and an adjustment jaw 3 is attached to the opposite side by a fastening bolt 5 to form a lip gap 11. doing.

  One end of the connecting rod 6 is fixed to the adjusting jaw 3 with a set screw 9, and a female screw having an M8 pitch of 1.25 mm is cut on the other end side of the connecting rod 6. One end of the adjusting bolt 7 is screwed to the threaded portion of the M8, and the other end of the adjusting bolt 7 is threaded with an M10 pitch of 1.5 mm and fixed to the main body 2. It is screwed. Here, the connecting rod 6 and the adjusting bolt 7 function as a differential screw that moves with a pitch difference of 1.25 mm and 1.5 mm. Moreover, the attachment interval 13 of the adjusting bolt 7 is 25 mm.

  The adjustment jaw 3 is provided with a plurality of oval through holes 10, and the X and Y portions formed by providing the through holes 10 are narrow in width, so the rigidity in the direction of the lip gap 11 is small, and the lip When the gap 11 is adjusted, the X and Y portions are easily deformed.

  Accordingly, the adjustment bolt 7 can be adjusted with a small force, and the adjustment bolt 7 can be reduced in size, so that the mounting interval 13 of the adjustment bolt 7 can be reduced, and the lip is coupled with the adjustment bolt 7 and the connecting rod 6 of the differential screw. It can be finely adjusted locally in the gap direction.

Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, the shape of the through hole 10 may be a rectangle instead of an oval. Moreover, it may replace with the adjustment bolt 7 and may adjust using the thermal expansion of a bolt using an electrothermal bolt.

The invention's effect

  As described above, according to the present invention, in the T-die for film forming that has the adjusting jaw that slides and adjusts the lip gap and that forms the molten synthetic resin supplied from the extruder into the film, the adjusting jaw Since the plurality of through holes are provided, the adjustment jaw can be finely adjusted with a small force, the apparatus can be miniaturized, and the uneven thickness of the film can be minimized.

  It is sectional drawing of the T die for film forming regarding this invention.   Similarly, it is an A arrow view of FIG.   Similarly, it is BB sectional drawing of FIG.   It is sectional drawing of the T die for film forming regarding a prior art.

Explanation of symbols

1 T-die for film molding 3 Adjustment jaw 10 Through hole 11 Lip gap 12 Film

Claims (1)

In a T-die for film forming that has an adjustment jaw that slides and adjusts the lip gap, and that forms a molten synthetic resin supplied from an extruder into a film,
A film-forming T-die comprising a plurality of through holes provided in the adjustment jaw.

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