吹膜模头设计的一些见解

need a sect of straight molding sect channel to get the steady layer borderline 。 A nd then carry through the press or dilation into die lip 。( 4) D ie part is the channel most close to film molding 。 It is directness connection with film surface quality 。 In order to ensure the die lip extrude the melt steadily , before die lip molding sect channel is also need a sect of storing material channel 。 T he transition channel incline angle between them usually is 7.5 °。 Die lip molding sect should have enough length to make the flow tropism steadily 。 D ie lip gap usually take the value between 0.9-3.2 。 S mall gap , die head output is low but good film quality , but the film surface will cause sharkskin if too small 。 T he bigger gap , the more output , oversize will effect the film quality 。