Modified post-consumer resin (PCR) suitable for shrink films, shrink films and articles comprising thereof and a method for preparing a shrink film. The modification of the PCR occurs by a free-radical initiator having a melt flow rate ranging from 0.01 to 1 g/10 min and it is added in an amount ranging from 100 to 1000 ppm based on the total weight of the modified PCR.

A heat-shrinkable polyester film that has (1) a hot-water heat shrinkage of 40% or more in a main shrinkage direction of the film when immersed in hot water of 98 C. for 10 seconds; (2) a planar orientation coefficient of 0.035-0.070; (3) ethylene terephthalate as a main constituent component and 6-25 mol % diethylene glycol (DEG) constituent in 100 mol % of polyhydric alcohol in all the polyester resin constituting the film; (4) a maximum shrinkage stress of 2-17 MPa in the main shrinkage direction of the film when measured in hot air of 90 C.; and (5) a tensile elongation at break of 20% or more in a direction orthogonal to the main shrinkage direction after the film is aged in an atmosphere with an atmospheric temperature of 40 C. and a relative humidity of 85% for 28 days.

In various examples, the subject matter of this disclosure relates to heat-shrinkable films and systems and methods for manufacturing and recycling heat-shrinkable films. A heat-shrinkable film can include: a first layer having a first copolymerized polyester resin; and a second layer disposed on the first layer and having a second copolymerized polyester resin, wherein the heat-shrinkable film is predisposed to either (i) curl towards the first layer when heat is applied or (ii) not curl towards the second layer when heat is applied. A layer of ink can be disposed on the second layer.

A multilayer film containing 80 mass % or more of a polyolefin-based resin. A thermally shrinkable multilayer film according to an embodiment of the present invention is a multilayer film including at least three layers including an outer surface layer (a) containing a polyolefin-based resin, an intermediate layer (b) containing a gas-barrier resin, and an inner surface layer (c) containing a polyolefin-based resin, in which at least one layer of the multilayer film contains a cyclic olefin copolymer; when a total mass of the multilayer film is 100 mass %, a proportion of a mass of the polyolefin-based resin in the multilayer film is 80 mass % or more, and a proportion of a mass of the cyclic olefin copolymer in the multilayer film is 15 mass % or more.

A pipe fitting (100) includes a tubular connecting part (101); the tubular connecting part being configured to be inserted into an expanded pipe end section (111) of a pipe (110) having a first circumferential intact sealing region (113) on the inner surface (112) of the pipe end section (111); the tubular connecting part comprising a first radially outwards extending circumferential sealing barb (105) positioned for engaging, when in use, with the first circumferential intact sealing region during shrinkage of the pipe end section for forming a sealing between the pipe fitting and the pipe.

A three-dimensional shaping method of shaping a three-dimensional shaped article using a first material including first resin and a second material including second resin having a heat shrinkage rate different from a heat shrinkage rate which the first resin has, the method including stacking, when preparing a first slice layer formed of one of the first material and the second material, and stacking a second slice layer formed of another of the first material and the second material on the first slice layer, a first boundary layer formed of the one of the first material and the second material on the first slice layer, staking a second boundary layer formed of the another of the first material and the second material on the first boundary layer, and stacking the second slice layer on the second boundary layer, wherein the first boundary layer is a layer provided with a plurality of voids formed inside a contour of the first boundary layer when viewing the first boundary layer from a stacking direction of the first slice layer and the second slice layer.

A polyester film includes a polyester (A) composed mainly of polybutylene terephthalate and a polyester (B) composed mainly of polyethylene terephthalate, wherein a mass ratio (A/B) between the polyesters (A) and (B) is 70/30 to 55/45, a dry heat shrinkage rate (B) through heat treatment at 200 C. for 15 minutes is 35% or less in any of four directions (0, 45 90 and 135) on the film surface, a difference between a maximum value and a minimum value of these dry heat shrinkage rates is 5% or less, a thickness variation in the four directions is 10% or less, and a crystallization index shown in DSC measurement is 25 to 55 J/g.

A heat-shrinkable film includes a first layer containing at least one of a petroleum resin, a terpene-based resin, or a rosin-based resin and containing a propylene-based resin, a cyclic olefin-based resin, and an ethylene-based resin containing an ethylene component in an amount of 50 mol % or more and having a melting point of 70 C. or higher.

[PROBLEMS] It is an object of the present invention to provide a heat-shrinkable polyester-based film roll which can reduce defects caused during a heat shrinking step due to the variation of a heat shrinkage rate in the heat-shrinkable polyester-based film roll having the longitudinal direction as the main shrinkage direction, specifically, defects of the film when covering an object by a wrap-around method and heat-shrunk. [SOLUTIONS] A heat-shrinkable polyester-based film roll, comprising a core; and a heat-shrinkable polyester-based film having a longitudinal direction as a main shrinkage direction that is wound around the core; wherein the film (roll) satisfy predetermined polyester composition, and all samples cutout every about 100 m have a heat shrinkage rate measured by immersion in hot water of 90 C. for 10 seconds of 30% or more and 80% or less and 3% or less of an average in the longitudinal direction.

A method for producing the fluororesin tube, the method including a step of subjecting a thermoplastic fluororesin to melt extrusion molding at a temperature of about 260 to 450 C., wherein the thermoplastic fluororesin is selected from the group consisting of a tetrafluoroethylene-hexafluoropropylene copolymer and a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, wherein in the melt extrusion molding, a flow path of the molten thermoplastic fluororesin is temporarily branched to form a weld line in a lengthwise direction in the fluororesin tube. In some cases, the fluororesin tube has tearing property in a lengthwise direction and the method includes subjecting the thermoplastic fluororesin, a filler and/or a contrast agent to the melt extrusion molding.