US 4,983,238 AGranted

Method for manufacturing a thermoplastic container with a label

AssigneeMitsui Toatsu Chemicals, Inc.

InventorsMasatsugu Yoshida, Seishiro Maruyama, Hiroshi Ezawa, Takayuki Watanabe, Hiroaki Tsushima

Life of this patent

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Abstract

A sheet made from a foamed polystyrene resin which is heat-shrinkable in one axial direction and has a heat-insulatingness is prepared. A printing process is applied to this sheet to produce a label. A container made from a thermo-plastic resin is covered with said cylindrical label and is put in a furnace in order to heat-shrink the label to be fitted on the container. The container with the label manufactured in accordance with the present invention has a superior heat-insulatingness, and thus can maintain the temperature of water contained therein for a longer time. Also, when it is used in a electronic-range, a temperature of an outer wall surface of the container can be prevented from increasing, and thus the container can be held by a bare hand even immediately after cooking.

Claims23

Dependent claims

A method for manufacturing a thermoplastic container with a label comprising:

extruding a resin sheet and stretching said resin sheet in the direction of extrusion;
cutting said sheet to a desired size to make a label;
forming said label into a cylinder such that the circumference of said cylinder corresponds to the direction of stretching, said cylinder having a circumference less than the maximum circumference of the container;
placing the formed cylindrical label onto the container by applying sufficient force to stretch the portion of the label to be placed in contact with the area of maximum circumference of the container, wherein the circumference of at least a portion of the label remains less than the maximum circumference of the container;
and
heating said cylindrical label to a temperature sufficient to heat shrink the label into adherence with the container.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/261,407Filed 24 Oct 1988
Priority: JP 62-26540122 Oct 1987
Granted: 8 Jan 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

B29C 66/7371
Characterised by the state of the material of the parts to be joined: oriented or heat-shrinkable
B29C 53/40
By bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges: for articles of definite…
B29C 63/426
Specially applied to the mass-production of externally coated articles, e.g. bottles: in combination with the in situ shaping of the external…
B29C 66/1122
Single lapped joints: single lap to lap joints, i.e. overlap joints