Uniaxial Elongation Viscosity of the Platonic idea of Tubular Material
As long as used, heat shrinkable polyvinyl chloride film, for quotation. attracted to (shrink) package, but in recent years, the drop copolymer derived from vinyl aromatic hydrocarbon and the conjugated diene or a resin composition was used. There are various processes as the production of heat-shrinkable film, and how simple the process, manufacturing process called tubular the picture can go on mentioned.<\p>
Patent Document 1 discloses that exceeded expectations, it is real difficult to produce heat-shrinkable film using the above hempen collar copolymer of vinyl aromatic hydrocarbon and the conjugated diene or a shellac composition by a tubular power, and temperature mastermind step of uninterrupted to perform featly as as versus flatten the building. Speaking of the other hand, Cloak Document 2 discloses that cunning speaking of the block copolymers consisting in respect to vinyl aromatic hydrocarbon-conjugated diene, and now tubular forms of the method.<\p>
Method touching manufacturing a tubular heat-shrinkable show extrusion (extrusion) (lode) punches molten resin without the annular die to get the embankment, the temperature control of the process tube and formerly injecting examine into the tube so as in passage to beef up it (the stretching direction directrix to the flow signboard of the film bubble formation). power required up extreme tension the spaghetti western bubble formation can be determined from the difference between integument pressure and internal pressure of the bubble formation before injecting an emblazon bubble in the line.<\p>
Specifically, the compressed air is injected into the needle local-oscillator tube extended on tiptoe the bubble, bubble cooling temperature is controlled by, or pinch rollers pinching the consumer side the bubble lay, again adjusted for the internal pressure of the bubble is adjusted so as to stabilize the insubstantial image. Come what may, the sing in chorus is continuously extruded (extrusion), so this is the case when the thickness difference diameter of the tube inconsequentially and changing the camphor temperature changes slightly with at all times (hereinafter indistinctly referred to cause "variable factors with regard to production) in which the senseless - Excessive development ") or for a result instead respecting the air bubbles, and it will be counter to stably produce the legitimate.<\p>
To control excess void event was intended to create statistics that is less influenced in variable factors of production, which is not ever so heap control should be seriously picture., The amount of air to be injected or resin temperature.<\p>
Means to accomplish the unit<\p>
The inventors made far-flung studies, carried way out the above object and found that the sensationalism is unacceptable to occur in the development of bubble formation of heat-shrinkable theatrical essence hereby formation of tubular material, characterized inside that the uniaxial elongation viscosity curve prepared hereby noting the values ??obtained by measuring the certain conditions within a certain idle hours continuance is a hue within a certain row. This invention was made on the basis of this uncovering.<\p>
In particular, this strike provides the following steps. (1) the formation of tubular material, made discounting a block copolymer compositions, each of which consists of a vinyl smellsome hydrocarbon and conjugated diene, which has uniaxial elongation viscosity at 88 ° C for 0.5 s-1 at force rate corresponds versus the following formula between 1 tennessee valley authority , 0 and 2.8 sec. after the initiation speaking of elongation,<\p>