Triple extrusion die head with low center

Abstract

The invention discloses a triple extrusion die head with a low center, wherein, an inner layer feed inlet (12), a middle layer feed inlet (13) and an outer layer feed inlet (14) are positioned in a same plane and the center-height of which is H. The invention overcomes the defects that the runner of the existing triple extrusion die head has long length, the amount of polymer accumulated in the center of a die is large, the time needed for changing the resin or the color is long, and the cooling efficiency is low and the like. The distribution design of the invention reduces the height of thedie head, shortens the length of the runner, improves the cooling efficiency, ensures more convenient operation of the film pulling, reduces the amount of polymer accumulated in the die head, and leads the changing of the material or the color more rapid.

Description

technical field

[0001] The invention relates to the field of plastic film manufacturing machinery, more specifically it is a low center three-layer co-extrusion die head. Background technique

[0002] Most of the feeding methods of the existing three-layer co-extrusion dies use concentric core sleeves to feed in layers. The centerlines of the three-layer feeding ports are not on the same level, and there is a certain height difference, which requires extrusion of each layer. The height of the machine center is different. Such a feeding method increases the length of the flow channels of each layer, the stock of polymer in the center of the mold is high, and the overall height of the mold is high. This will increase the possibility of polymer decomposition in the die, the time required to change the resin or color will be longer, and the relative distance between the die outlet and the center line of the main traction will be short, that is, the effective height of the upper...

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