A cylindrical shrink label is provided with a heat-shrinkable label base material; and a joint formed by cylindrically forming the label base material so that the edges thereof overlap, and then solvent welding the inner surface of the outside edge, which is positioned on the outside of the cylinder, and the outer surface of the inside edge, which is positioned on the inside of the cylinder. A resin layer, which is soluble in a hot alkaline aqueous solution, is formed on the abovementioned inner surface and/or the abovementioned outer surface, which form the joint.

A cylindrical shrink label is provided with a heat-shrinkable label base material; and a joint formed by cylindrically forming the label base material so that the edges thereof overlap, and then solvent welding the inner surface of the outside edge, which is positioned on the outside of the cylinder, and the outer surface of the inside edge, which is positioned on the inside of the cylinder. A resin layer, which is soluble in a hot alkaline aqueous solution, is formed on the abovementioned inner surface and/or the abovementioned outer surface, which form the joint.

A cylindrical shrink label is provided with a heat-shrinkable label base material; and a joint formed by cylindrically forming the label base material so that the edges thereof overlap, and then solvent welding the inner surface of the outside edge, which is positioned on the outside of the cylinder, and the outer surface of the inside edge, which is positioned on the inside of the cylinder. A resin layer, which is soluble in a hot alkaline aqueous solution, is formed on the abovementioned inner surface and/or the abovementioned outer surface, which form the joint.

A solar-reactive agricultural mulch film including a sheet of heat-shrink material having one or more layers and uniform thickness, formed by a mechanical process. The process includes elongating the sheet, in a longitudinal direction, evenly across a width of the sheet, while the sheet is at a stretching temperature to pre-strain the sheet evenly across the width, and yields the solar-reactive agricultural mulch film having the uniform thickness throughout and being configured to, in operation, shrink when an exposure temperature of the material is elevated, by exposure to solar energy, to a shrinking temperature. The process may include elevating the sheet to an above-ambient stretching temperature for the elongating, or elongating the sheet at an ambient temperature.

The invention provides a heat shrinkable polyester film which has (1) a hot-water heat shrinkage of not less than 55% and not more than 90% in a main shrinking direction of the film when dipped in hot water at 98 C.; (2) a hot-water heat shrinkage of not less than 5% and not more than 12% in a direction orthogonal to the main shrinking direction of the film when dipped in hot water at 98 C.; (3) a difference in specific heat capacity C.sub.p between at a lower and a higher temperature than Tg of not less than 0.1 J/(g.Math. C.) and not more than 0.7 J/(g.Math. C.) when a reverse heat flow is measured with a temperature modulated DSC; and (4) a tensile breaking strength of not less than 70 MPa and not more than 150 MPa in the direction orthogonal to the main shrinking direction of the film.

The invention provides a heat-shrinkable polyester-based film, where the heat-shrinkage ratio in the width direction is high and the irregularity of thickness is small. The heat-shrinkable polyester-based film of the present invention contains 90 mol % or more of ethylene terephthalate unit based on 100 mol % of whole ester unit, wherein, the heat-shrinkable polyester-based film satisfies the requirements: (1) heat-shrinkage ratio in a width direction measured by shrinking the film for 10 seconds in 90? C. hot water is 50%-75%, (2) heat-shrinkage ratio in a longitudinal direction measured by shrinking the film for 10 seconds in 90? C. hot water is ?6% or more and 14% or less, (3) heat-shrinkage ratio in the longitudinal direction measured by shrinking the film for 10 seconds in 70? C. hot water is ?6% or more and 6% or less, and (4) irregularity of thickness in the width direction is 1%-20%.

A blend composition comprising a first polyester and a second polyester. The first and second polyesters each comprises residues of terephthalic acid, neopentyl glycol (NPG), 1,4-cyclohexanedimethanol (CHDM), ethylene glycol (EG), and/or diethylene glycol (DEG). The first polyester comprises NPG, CHDM, and DEG in a combined amount that is less than the second polyester. The blend composition can be useful for producing a shrink film exhibiting high ultimate shrinkage (e.g., >65% at 95? C. for 10 seconds) and a high strain induced crystalline melting point (e.g., greater than 190? C.).

The invention provides a heat-shrinkable polyester film which has a high heat shrinkage rate in the width direction, exhibits a low heat shrinkage rate in the longitudinal direction, and has a great mechanical strength in the longitudinal direction, good openability along perforations, and excellent shrink finish. The film has a hot-water heat shrinkage rate of 40% to 85% in the main shrinking direction and 5% to 15% in the perpendicular direction when the film is immersed in hot water at 98 C. for 10 seconds, and a maximum shrinkage stress of 2-7 MPa in the main shrinking direction when measured in hot air of 90 C. and the shrinkage stress 30 seconds after measurement of the shrinkage stress has started is of 60-100% of the maximum shrinkage stress. The film contains 6 mol % or more of diethylene glycol-derived constituent units with respect to 100 mol % of all polyester resin components.

This invention relates to processes for collation shrink packaging of one or more items with a thermally insulating film, to films for such processes, to packages so made, and to methods for extruding such films. The one or more items packaged may be cans, bottles, pouches and other carriers of liquid or solids.

The blocking phenomenon at the time of recycling can be effectively suppressed. Provided is a heat-shrinkable polyester film derived from a first polyester resin and a second polyester resin as a plurality of polyester resins having different crystallinity, the heat-shrinkable polyester film satisfying the following characteristics (A) to (E). (A) and (B): The first polyester resin includes terephthalic acid, in which a reaction amount of ethylene glycol is in the range of 50 mol % or more and below 90 mol %, and the second polyester resin includes terephthalic acid, in which a reaction amount of ethylene glycol is 90 mol % or more. (C) and (D): When predetermined isothermal crystallization measurement is performed, an exothermic peak appears within 12 minutes from the start, including a cooling process time, and the heat quantity of the exothermic peak is 5 to 35 J/g. (E): The thermal shrinkage ratio in the main shrinkage direction as measured under predetermined conditions is 20% to 60%.