JPH018351Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an adapter connected to an extruder for laminate film, and more particularly to an adapter that enables lamination processing with excellent printability to be carried out on laminate film.

Conventionally, when laminating using the T-die method using a single extruder, the fixing eye tends to create recesses in the base paper, resulting in ink seepage, etc. There are problems such as the printing suitability is greatly deteriorated and the ventilation blocking property is also significantly reduced. The reason for this is that, as shown in Figure 1, in the resin film 2 laminated on the top surface of the paper 1, there are usually many fine bubbles 3 inside the resin film. This is because cracks are generated around the existing air bubbles 3 and recesses 4 are formed on the surface.

In order to solve the above problem, we used two extruders,
It is conceivable to merge the resins using an adapter, but in this case, not only does it require two extruders and the equipment configuration becomes larger, but also the flow rate may be lower because the resin flows that have been extruded separately are merged. There are also problems with adjustments.

On the other hand, apart from the above-mentioned lamination problem, it has been known to branch out the intermediate portion of the resin flow path in order to generally improve the degree of kneading of the resin. For example, Japanese Patent Application Laid-Open No. 163545/1983 discloses a system in which such a branch flow path is provided, and when the flow is divided in the radial direction, the resin is forced to pass through a narrow slit portion, thereby giving strong kneading to the resin and causing the resin to join again. . However, such a method in which the flow is divided simply to increase the degree of kneading cannot solve the above-mentioned problems associated with lamination. This is because the occurrence of fish eyes and the like cannot be eliminated simply by increasing the degree of kneading.

Contrary to the idea of increasing the degree of kneading, the present invention solves the conventional problems by actively stratifying the resin flow. A resin flow path is provided in which the parts are branched and the branch flow path is formed flat, and the branch flow paths are merged again on the exit side so that the resin flow that has passed through the branch flow path is stacked on each other while remaining flat. It is characterized by being able to grow.

The present invention will be explained in detail below based on an embodiment shown in the drawings. The adapter of the present invention is shown in FIGS. 2 to 4.

FIG. 2 is a sectional view of the adapter according to the present invention. In the figure, the adapter 10 is formed by integrally joining an upper adapter 11 on the upstream side and a lower adapter 12 on the downstream side. The upper adapter 11
and the lower adapter 12 have flanges 11a and 1, respectively.
2a is provided, and the flanges 11a, 12
Both adapters 1 are connected by bolts 13 through a.
1 and 12 are joined together. A resin flow path 14 is provided inside the adapter 10.
The resin flow path 14 passes through the inside of the adapter 10, and an inlet block 15 for the resin flow path is provided at the upstream end of the upper adapter 11, and an inlet block 15 for the resin flow path is provided at the downstream end of the lower adapter 12. A channel outlet block 16 is provided. The adapter 10 is connected to an extruder (not shown) through an inlet block 15, and a T-die (not shown) or the like is connected to the outlet block 16.

Furthermore, the adapter 10 of the present invention has its resin flow path 1
4 is branched in the middle, and the branch flow path is formed flat, and the branch flow paths are formed so that they merge again on the exit side so that the resin flows that have passed through the branch flow path are stacked on each other while remaining flat. has been done.

That is, a branch block 17 is interposed at the joint between the upper adapter 11 and the lower adapter 12, and the resin flow path 14 is divided by the branch block 17. As shown in FIGS. 3 and 4, the branch block 17 is formed inside the adapter 10 so as to protrude in the radial direction thereof, and the upstream end surface 17a of the branch block 17 has a hole centered around the resin flow path 14. Branch channels 17b and 17c extending in the radial direction are carved. These branch channels 17b and 17c are curved left and right at the end surface 17a, and their directions are reversed to form an S-shaped channel. Furthermore, the branch passages 17b and 17c are formed so that the cross section of the passage passing through the branch block 17 is flat, and the branch passages 17b and 17c are formed in parallel with each other in the width direction. Furthermore, the branch channels 17b and 17c are inclined at a predetermined angle θ so that the resin flows that have passed through the branch channels 1b and 17c merge with each other toward the downstream side so that the resin flows remain flat and stacked on top of each other.

In the above configuration, the resin that has flowed into the flow path 14 of the adapter 10 through the inlet block 15 is branched by the branch flow paths 17b, 17c, and the directions are reversed to form a flat resin flow. After passing through, it rejoins. In this case, the resin flows are laminated symmetrically with the flow in the width direction reversed to each other. Therefore, the distortions of the resin flow cancel each other out, and it is possible to perform a homogeneous lamination process as a whole.

As explained above, according to the adapter of the present invention, the resin flow is differentiated and laminated in a laminated state as shown in FIG. Since there is an additional resin layer on the side, the concave portion 4 does not expand to the base paper 1, and accordingly, ink does not bleed, so that suitable printability can be obtained.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional diagram of conventional laminating process.
Figures 2 to 4 relate to the adapter of the present invention, Figure 2 is a sectional view thereof, Figure 3 is a sectional view of the branch block, Figure 4 is a front view thereof, and Figure 5 is a diagram showing the use of the adapter of the present invention. FIG. In the drawings, 1 is paper, 2 is a resin film, 3 is a bubble, 4 is a recess, 10 is an adapter, 11 is an upper adapter,
12 is a lower adapter, 13 is a bolt, 14 is a resin flow path, 15 is an inlet block, 16 is an outlet block, 17 is a branch block, 17a is an end face, 17
b, 17c are branch flow paths.

Claims (1)

[Scope of utility model registration request] The intermediate portion of the resin flow path was branched and the branched flow path was formed flat, and the branched flow paths were merged again on the exit side so that the resin flow that had passed through the branch flow path remained flat and stacked on top of each other. An adapter for an extruder for laminating film, characterized by being equipped with a resin flow path.