Flat Die and Method for Manufacturing Laminated Resin Film or Sheet Using the Same

A flat die for use in molding at least two resins, comprising:

• a resin inlet portion for introducing molten resins therethrough;
• a manifold connected to the resin inlet portion;
• and
• a lip opening for discharging the resins therethrough,
• wherein the manifold comprises a cavity defining a width direction, a thickness direction, and a resin flowing direction, the directions being perpendicular to one another;
• wherein the manifold has a larger width in the width direction as compared with the resin inlet portion;
• wherein molten resins supplied to the die through the resin inlet portion are to enter the manifold and to flow so as to spread in the width direction in the manifold, then being discharged through the lip opening;
• and
• wherein, when resins of different kinds flow in the manifold in a laminated condition in which each resin forms a layer in the thickness direction, the die allows each resin to be introduced into the manifold so that one layer of resin spreads in the width direction in a different way from an adjoining layer of resin.

A flat die for use in molding resin, comprising:

• a resin inlet portion for introducing at least one molten resin therethrough;
• a manifold connected to the resin inlet portion and defining a width direction and a thickness direction perpendicular to the width direction;
• a projecting cavity formed adjacent to the resin inlet portion and to part of the manifold where the manifold is connected to the resin inlet portion so that the projecting cavity projects in the thickness direction as compared with the manifold;
• and
• a lip opening for discharging the resin therethrough,
• wherein the manifold has a larger width in the width direction as compared with the resin inlet portion;
• and
• wherein molten resin supplied to the die through the resin inlet portion and the projecting cavity is to enter the manifold and to flow so as to spread in the width direction in the manifold, then being discharged through the lip opening.

A flat die for use in molding resin, comprising:

• a resin inlet portion for introducing at least one molten resin therethrough;
• a manifold connected to the resin inlet portion;
• and
• a lip opening for discharging the resin therethrough,
• wherein the manifold comprises a cavity defining a width direction, a thickness direction, and a resin flowing direction, the directions being perpendicular to one another,
• wherein the manifold has a larger width in the width direction as compared with the resin inlet portion;
• and
• wherein molten resin supplied to the die through the resin inlet portion is to flow into the manifold in a manifold-inflow direction crosswise to the resin flowing direction;
• so that the supplied resin enters the manifold and flows so as to spread in the width direction in the manifold, then being discharged through the lip opening.

A flat die for use in molding at least two molten resins, comprising:

• a plurality of resin inlet portions for introducing molten resins therethrough;
• a manifold connected to the resin inlet portions;
• and
• a lip opening for discharging the resins therethrough,
• wherein the manifold comprises a cavity defining a width direction, a thickness direction, and a resin flowing direction, the directions being perpendicular to one another;
• wherein the manifold has a larger width in the width direction as compared with the resin inlet portions;
• and
• wherein the resin inlet portions are connected to the manifold at an identical position in the width direction and at different positions in the resin flowing direction,
• so that molten resins supplied to the die through the resin inlet portions enter the manifold and flow so as to spread in the manifold in the width direction, then being discharged through the lip opening.