Apparatus for shaping an oriented tubular film by wet process

Claim 1

An apparatus for shaping an oriented tubular film by downwards blowing wet process, which comprises: a hollow cylinder having an annular feed vessel for coagulation liquid at the top thereof, provided sufficiently below and concentrically to an annular die from which a tubular polymer mass is extruded penetratingly and vertically through the top wall of a sufficiently spacious negative pressure chamber capable of accommodating therein hereinafter-mentioned successive means down to a flattening and withdrawing pinching means, the upper part of the hollow cylinder, projecting out from the negative pressure chamber, having heating means from outside thereof and grooved inner wall surface, and the lower part of said hollow cylinder, extending into the negative pressure chamber, consisting of a perforated wall through which negative pressure outside the wall and in the negative pressure chamber can suck and press the film thereto, to support the film while passing therethrough; a downwardly spread, conical umbrella-like guide wall for the inflating tubular film, attached to the lower end of the perforated hollow cylinder; supply means for supplemental heated liquid to the perforated wall and the umbrella-like guide wall; an annular trough with drainage means to collect the flowing down liquid and separate the heating liquid from the inflated tubular film at the lower end of said guide wall; an annular coagulating liquid tube provided below the trough to inject a coagulation liquid to the tubular film; a flattening and withdrawing means of the tubular film provided at the bottom of the negative pressure chamber; and a negative pressure sealing means provided at the side bottom of the negative pressure chamber together with outside withdrawing means to withdraw the flattened tubular film into the atmosphere.

Claim 2

An apparatus for shaping an oriented tubular film by downwards blowing wet process, which comprises: a hollow cylinder having an annular feed vessel for coagulation liquid at the top thereof, provided sufficiently below and concentrically to an annular die from which a tubular polymer mass is extruded penetratingly and vertically through the top wall of a sufficiently spacious negative pressure chamber capable of accommodating therein hereinafter-mentioned successive means down to a flattening and withdrawing pinching means, the upper part of the hollow cylinder, projecting out from the negative pressure chamber, having heating means from outside thereof and grooved inner wall surface, and the lower part of said hollow cylinder, extending into the negative pressure chamber, consisting of a perforated wall through which negative pressure outside the wall and in the negative pressure chamber can suck and press the film thereto, to support the film while passing therethrough; a downwardly spread, conical umbrella-like guide wall for the inflating tubular film, attached to the lower end of the perforated hollow cylinder; supply means for supplemental heated liquid to the perforated wall and the umbrella-like guide wall; an annular trough with drainage means to collect the flowing down liquid and separate the heating liquid from the inflated tubular film at the lower end of said guide wall; an annular coagulating liquid tube provided below the trough to inject a coagulation liquid to the tubular film; a flattening and withdrawing means of the tubular film provided at the bottom of the negative pressure chamber; and a negative pressure sealing means provided at the side bottom of the negative pressure chamber together with outside withdrawing means to withdraw the flattened tubular film into the atmosphere.