The heat shrinkable tube according to the present disclosure contains an ethylene-tetrafluoroethylene copolymer as a main component. The heat shrinkable tube has a melting point of 210? C. to 250? C. and a storage elastic modulus of 0.8 MPa to 2.8 MPa at 250? C. to 280? C.

To provide an insole more easily fitting to a purchaser's foot. A method for manufacturing an insole comprises: a first step of foaming a footprint resin portion 12 having a footprint shape having a predetermined thickness using a thermoplastic resin which melts at a predetermined temperature; a second step of performing shrink processing such that the footprint resin portion 12 is covered with a film, and thereafter vacuum packing the footprint resin portion covered with the film in a nylon polyethylene bag; a third step of heating the insole 10 manufactured through the first step and the second step at a predetermined temperature; and a fourth step of attaching the insole 10 having the footprint resin portion 12 melt by the third step to the inside of a shoe 2 of a user, and hardening the footprint resin portion 12 by leaving the shoe 2 stand for a predetermined time period while the user is wearing the shoe 2.

The present invention relates to an MDO thermoresistant heat-shrinkable multilayer film of a copolymer polyester having excellent thermal resistance. In particular, the present invention provides an MDO thermoresistant heat-shrinkable multilayer film that includes multiple skin layers capable of improving thermal resistance formed on a substrate layer capable of providing high shrinkage, and simultaneously has excellent thermal resistance and high shrinkage properties through MD orientation instead of the conventional TD orientation method.

A thermally shrinkable tube heating apparatus 10 includes a holding member 40A including an accommodation space S1 capable of accommodating a thermally shrinkable tube 5; and a hot air generation device 50 generating hot air. A wall 41W of the holding member 40A is provided around a predetermined axis Ax, extends in a direction of the axis Ax, and forms the accommodation space S1 inner thereto. An inlet flow path R3 includes a supply opening R3a opened to an outer surface of the holding member 40A and an inlet opening R3b opened to the wall 41W. A discharge flow path R1 includes an outlet opening Ria opened to the wall 41W and a discharge opening Rib opened to the outer surface of the holding member 40A. The hot air generation device 50 sends the hot air into the supply opening R3a.

[Problem] To provide a composite preform that can ensure that worsening of the appearance of a surface of a plastic member caused by near-infrared heating prior to blow molding is effectively prevented and that an inner preform is efficiently heated.

[Solution] The composite preform of the present invention includes a preform and a heat-contractive plastic member, the preform including a mouth part; a trunk part linked to the mouth part; and a bottom part linked to the trunk part, and the heat-contractive plastic member being disposed so as to surround the outside of the preform and including at least a colored layer that contains a resin material and a colorant, wherein the heat-contractive plastic member has a near-infrared transmittance of 50% or higher.

Embodiments relate to a heat shrinkable film, which has a heat shrinkage rate in the direction perpendicular to the main shrinkage direction that is not high even at a high temperature and which is printable thereon. The heat shrinkable film comprises a polyester resin, wherein the heat shrinkage characteristics in the direction perpendicular to the main shrinkage direction satisfy the following Relationships 1 and 2:

15T.sub.70650[Relationship 1]

0T.sub.100955[Relationship 2] wherein T.sub.X-Y is a value obtained by subtracting a heat shrinkage rate of the heat shrinkable film in the direction perpendicular to the main shrinkage direction after the heat shrinkable film is immersed in a water bath for 10 seconds at Y C. from a heat shrinkage rate of the heat shrinkable film in the direction perpendicular to the main shrinkage direction after the heat shrinkable film is immersed in a water bath for 10 seconds at X C.

This method for manufacturing a composite preform (70) includes: preparing a preform (10a) that is formed from a plastic material; preparing a tubular heat shrinkable plastic member (40a) that is longer than the preform (10a) and has a margin (80a) for thermocompression bonding at one end; inserting the preform (10a) into the plastic member (40a); having the plastic member (40a) undergo thermal shrinkage by heating the preform (10a) and the plastic member (40a); and bonding the margin (80a) of the plastic member by thermocompression.

An electronic core for a metal card, such as a transaction card, having a metal core and a cured polymer top surface, is manufactured by a process in which a two-part polymer mixture is introduced to a reservoir holding the metal core in a process chamber, and then a partial vacuum followed by pressurization with inert gas are used to reduce the volume of voids in the partially-cured polymer mixture, followed by curing outside of the process chamber, and then the top surface is removed by a treatment operation, such as milling or etching, to form a reduced upper surface with less surface irregularities which is more substantially plan the original top surface.

The present invention relates to an MDO thermoresistant heat-shrinkable multilayer film of a copolymer polyester having excellent thermal resistance. In particular, the present invention provides an MDO thermoresistant heat-shrinkable multilayer film that includes multiple skin layers capable of improving thermal resistance formed on a substrate layer capable of providing high shrinkage, and simultaneously has excellent thermal resistance and high shrinkage properties through MD orientation instead of the conventional TD orientation method.

Provided are a tube that has high inner-surface smoothness and outer-surface smoothness and a thickness distribution with a small variation, and a method for manufacturing the tube. The tube includes points a, b, c, and d that satisfy the following conditions (1) and (2): (1) 0.9<Rea/Rec<1.1 and 0.9<Reb/Red<1.1; and (2) Rea/Reb0.9 or Rea/Reb1.1. The points a, b, c, and d are four random points that are located on the circumference of the tube on any cross section in the axial direction of the tube, and are aligned in the stated order in a circumferential direction. Rea, Reb, Rec, and Red respectively indicate retardations at the points a, b, c, and d. The tube satisfies the following condition (3): (3) (10-point standard deviation/10-point average)1002 in the respective sets A, B, C, and D. Each of the sets A, B, C, and D includes retardations at ten random points present in a range between the point a, b, c, or d and a point 5 mm away from that point in the axial direction.