JP2003320573A - T die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a T die wherein only a land part at a lip end can be replaced in order to eliminate the problem that the whole of a lower die has to be replaced simply because of difference of the lip end, and the replacing work and the manufacturing cost become great losses. <P>SOLUTION: A molten resin is introduced from an extruder, and after being accumulated in a manifold inside for one time, the molten resin is distributed in the width direction, and a film or the like is extruded from a lip gap δ comprising a fixed lip 23 at the end and a movable lip 21 by this T die 20. In the T die 20, the land part 25 at the end of the lip is made replaceable. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a T-die for extruding a molten resin into a film sheet. 2. Description of the Related Art Referring to FIG.
The T-die 1 is formed by stacking upper and lower dies 2 and 3, a molten resin inlet 4 is provided on the rear end surface, a manifold 5 is provided inside, and the molten resin is temporarily stored in the manifold 5. A film or sheet 8 (hereinafter simply referred to as a film) having a predetermined thickness δ is formed from a lip gap formed by a fixed lip 6 and a movable lip 7 provided at a distal end portion in the width direction. In order to form a predetermined thickness δ uniformly in the width direction in the T-die 1, adjustment of the lip gap is an indispensable operation, and a plurality of adjustment bolts 9 provided in the width direction are used. The movable lip 7 is moved with respect to the fixed lip 6 to adjust the lip gap. [0004] The tip of the T-die is called a die line, and is a portion that has a large effect on the product, such as a fixing streak in the flow direction of the film or adhesion of a monomer called an eye, and the material of the surface (plating, thermal spraying, coating, etc.). And the size of the edge vary depending on the type of resin used for molding. For example, when replacing a chromium-plated product with a ceramic-sprayed product, a lip must be manufactured and replaced each time. Therefore, in order to exchange a different tip lip depending on the type of resin and the molded product,
The entire lower die had to be replaced, and the replacement work and manufacturing costs were severely lost. The object of the present invention is that the entire lower die is replaced only by the difference in the lip at the tip depending on the kind of resin and the molded product as described above, and the replacement work and manufacturing cost are greatly lost. An object of the present invention is to provide a T-die which can remove the lip and replace only the land at the tip of the lip. In order to achieve the above object, the present invention introduces a molten resin from an extruder, temporarily stores the molten resin in an internal manifold, distributes the molten resin in a width direction, and fixes a fixed lip at a tip. A T-die for extruding a film or the like from a lip gap composed of a lip and a movable lip, wherein a land portion at a tip of the lip is replaceable. As a result, the land portions at the tip of the lip having different surface treatments and different edge sizes can be easily replaced at a relatively low cost. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIGS.
The movable lip 21 is moved relative to the fixed lip 23 by a plurality of adjustment bolts 22 provided in the width direction to adjust the lip gap δ. Movable lip 2
A land portion 25 of an edge portion A provided with a surface material 24 such as ceramic spraying, chromium plating, or coating is exchangeably attached to a tip of the first portion by a plurality of bolts 26 provided in the width direction. The land portion 25 is slightly angled so that a gap is eliminated when the mating surface B tightens the bolt 26. Since the above-described structure is employed, the surface material 24 such as mesa plating, thermal spraying, coating, etc., which varies depending on the type of resin used for molding, and the land portion 25 of the edge A having a different size are replaced each time. It is possible to Although the above-described example has been described with reference to the lower die, the present invention is not limited to this, and an upper die may be used. According to the present invention, the entire lower die is replaced only by the difference in the lip at the tip depending on the type of resin and the molded product initially listed, and the replacement work and manufacturing cost are large. The disadvantage of loss is eliminated, and the land at the tip of the lip is relatively inexpensive and can be easily replaced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing one embodiment of the present invention, and is a cross-sectional view of a T-die in a film extrusion direction. FIG. 2 is an explanatory view showing one embodiment of the present invention, and is a detailed view of an “A” part in FIG. 1; FIG. 3 is an explanatory diagram illustrating a schematic configuration of a T-die. [Description of Signs] 20 Lower die 21 Movable lip 22 Adjusting bolt 23 Fixed lip 24 Surface material 25 Land 26 bolt

Claims (1)

Claims: 1. A molten resin is introduced from an extruder, temporarily stored in an internal manifold, and then distributed in a width direction, and a film or the like is removed from a lip gap formed by a fixed lip and a movable lip at a tip. A T-die for extruding a T-die, wherein a land portion at a tip of a lip is replaceable.