JPH0683327U - I die - Google Patents

Abstract

(57) [Summary] [Objective] To provide an I-die capable of changing the film width dimension while performing continuous molding. [Configuration] A flow channel of the molten polymer from the die inlet to one end (side end) of the manifold, a manifold for developing the molten polymer from the flow channel in the die width direction, and a flow of the molten polymer located at the open end of the manifold. An I die having a lip land to be arranged and a lip located at the tip of the lip land for extruding a molten polymer into a predetermined width and thickness, the die being provided at both end portions of the manifold, the lip land and the lip in the die width direction. A film characterized by being provided with an inner deckle that can move back and forth and that regulates the flow of the molten polymer at the side end portion, and the width dimension of the film to be extruded is adjusted by the movement of the inner deckle. Width adjustable type I die.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a film width adjusting type I die, and more specifically, an inner deckle that is freely movable in the die width direction at both ends of the I die and that regulates the flow of molten polymer at both ends. The present invention relates to an I die in which the width dimension of a film to be extruded is adjusted by moving the inner deckle.

[0002]

[Prior art]

 Conventionally, in film extrusion molding, the width dimension of the formed film is determined by the manifold length of the I-die, the lip land, and the width direction of the lip. Therefore, when changing the width dimension of the formed film, In general, continuous molding has been interrupted, and an I die having a manifold, a lip land and a lip length according to the film width has been replaced.

[0003]

[Problems to be solved by the device]

 However, the method of exchanging with an I die having a predetermined width of manifold, lip land, and lip length in the width direction cannot be performed without cutting the film or under continuous molding, and the I die It takes a long time to replace, which is a cause of lowering the operation rate of the film forming equipment. Further, there is a problem that it takes a long time after the I die is replaced and the molding is restarted until the molding is stable and the product film is obtained. Since the film extruded before the molding is stable cannot be supplied as a product, there is a problem that the polymer raw material is wasted and the economical efficiency is impaired.

An object of the present invention is to solve the above-mentioned drawbacks and provide an I-die capable of changing the width dimension of a film while performing continuous forming without cutting without exchanging the die.

[0005]

[Means for Solving the Problems]

 The object of the present invention is, according to the present invention, a flow path of a molten polymer from a die inlet to one end (side end) of a manifold, a manifold for developing the melted polymer from the flow path in a die width direction, and an opening of the manifold. An I-die having a lip land located at the end for regulating the flow of the molten polymer and a lip located at the tip of the lip land for extruding the molten polymer to a predetermined width and thickness, the manifold, the lip land and both sides of the lip. An inner deckle is provided at each end so that it can move back and forth in the die width direction and that regulates the flow of the molten polymer at the side end, and the width direction of the film extruded by the movement of the inner deckle is adjusted. This is achieved by a film width adjusting type I die characterized by being adjusted.

Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a front sectional view of a film width adjusting type I die showing an example of the present invention. In FIG. 1, 1 is a die main body, 2 is a flow path of the molten polymer from the die inlet to one end (side end) of the manifold, 3 is a manifold for developing the molten polymer, 4 is a lip land for regulating the flow of the molten polymer, Reference numeral 5 is a lip, 6 and 6'inner deckles for restricting the flow of molten polymer, and 7 and 7'denotes devices for moving the inner deckles 6 and 6'in the die width direction.

As shown in FIG. 1, a molten polymer supplied from a melt extruder (not shown) is spread in a manifold 3 from a die inlet through a molten polymer flow path 2, a lip land 4, and a lip land 4. 5 is extruded into a film. At this time, since the normal die does not have a function of adjusting the film width dimension, the die body 1 must be replaced when changing the film width dimension, and continuous film forming is interrupted because the continuous molding is interrupted. Utilization rate of.

The I-die of the present invention has a function of adjusting the dimension of the film width, and is provided at both end portions of the manifold 3, the lip land 4, and the lip 5 by the moving devices 7 and 7 ', respectively, in the die width direction. Inner deckles 6 and 6'that can be moved to are provided. By moving the inner deckles 6 and 6'in the die width direction, the film width can be changed under continuous molding without replacing the die body.

2 to 5 show examples of cross-sectional shapes from the manifold 3 to the lip 5 in the I-die, FIG. 2 and FIG. 4 are side cross-sectional views taken along the line AA of FIG. 5 is a side sectional view taken along line BB of FIG. In FIGS. 2 to 5, only the inner deckle portion is hatched for easy understanding. 4 and 5 are modifications of FIGS. 2 and 3, respectively. 2 and 4, the inner deckle 6 has a shape that shields the molten polymer from flowing into a part of the lower side (opening side) of the manifold 3 and all of the lip lands 4 and the lip 5. . In FIGS. 3 and 5, the inner deckle 6 ′ has a shape that blocks the inflow of the molten polymer into all of the manifold 3, the lip land 4, and the lip 5.

The thermoplastic polymer useful for producing a film using the I-die of the present invention may be any polymer capable of forming a film. Typical examples thereof include polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalene dicarboxylate, high density polyethylene, polypropylene, nylon 6 and nylon 66. These may be used alone or in combination of two or more.

[0012]

[Effect of device]

 According to the present invention, it is possible to provide an I-die capable of changing the dimension of the film width by moving and adjusting the positions of the inner deckles 6 and 6 '.

[Brief description of drawings]

FIG. 1 is a front sectional view of an I-die showing an example of the present invention.

FIG. 2 is a side sectional view showing an example of a shape from the manifold to the lip taken along the line AA in FIG.

FIG. 3 is a side sectional view showing an example of a shape from the manifold to the lip taken along the line BB in FIG.

FIG. 4 is a side sectional view showing an example of a shape from the manifold to the lip taken along the line AA in FIG.

5 is a side sectional view showing an example of a shape from the manifold to the lip taken along the line BB in FIG.

[Explanation of symbols]

 1 die main body 2 polymer flow path 3 manifold 4 lip land 5 lip 6,6 'inner deckle 7,7' inner deckle moving device

Claims (1)

[Scope of utility model registration request] 1. A flow path of the molten polymer from the die inlet to one end (side end) of the manifold, a manifold for developing the molten polymer from the flow path in the die width direction, and a molten polymer located at the open end of the manifold. An I die having a lip land for regulating the flow and a lip located at the tip of the lip land for extruding a molten polymer to a predetermined width and thickness, wherein the die width is provided at both ends of the manifold, the lip land and the lip. An inner deckle that can move back and forth in the direction and regulates the flow of the molten polymer at the side end portion, and the width dimension of the film to be extruded is adjusted by the movement of the inner deckle. A film width adjustable type I die.