Container equipped with label and production method thereof
First Claim
1. A process for the preparation of a labelled hollow vessel having a non-bulging and non-wrinkling outer label surface with excellent adhesion and peeling resistance, which comprisespreparing a label composed mainly of a drawn film of a plastic material having a heat shrinkage factor measured in the machine direction larger than the forming shrinkage factor of a plastic material constituting the outer surface of a vessel wherein the heat shrinkage factor is measured at a temperature (T1) lower by 40°
- C. than the melting point or softening point of the plastic material constituting the outer surface of the vessel;
attaching the label to the inner surface of a cavity of a blow mold;
blow-forming a single-layer or multiple-layer plastic parison or sheet in the blow mold to bond the label to the surface of a side wall portion of the vessel formed, andwherein the plastic material constituting the outer surface of the vessel is a polyolefin.
1 Assignment
0 Petitions
Accused Products
Abstract
In a hollow molded container equipped with a label and its production method, molding is made by use of a label consisting, as a base, of a stretched film of a plastic having a thermal shrinkage ratio greater than a mold shrinkage ratio of a plastic constituting the outer surface of a container, at a temperature 40° C. lower than the melting point or softening point of the plastic so that the label is bonded to the container at a residual equilibrium shrinkage ratio (Rs), defined below, of 0.5 to 100%: Rs=L1 -L2 /L1, where L1 is a length of a label film peeled from the container and L2 is a length when the peeled label film is brought to equilibrium at the temperature (T1) described above. In this manner, crease and swelling of the label during labelling operation inside the mold can be prevented and adhesion and peel-resistance between the label and the container outer surface can be improved.
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Citations
24 Claims
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1. A process for the preparation of a labelled hollow vessel having a non-bulging and non-wrinkling outer label surface with excellent adhesion and peeling resistance, which comprises
preparing a label composed mainly of a drawn film of a plastic material having a heat shrinkage factor measured in the machine direction larger than the forming shrinkage factor of a plastic material constituting the outer surface of a vessel wherein the heat shrinkage factor is measured at a temperature (T1) lower by 40° - C. than the melting point or softening point of the plastic material constituting the outer surface of the vessel;
attaching the label to the inner surface of a cavity of a blow mold; blow-forming a single-layer or multiple-layer plastic parison or sheet in the blow mold to bond the label to the surface of a side wall portion of the vessel formed, and wherein the plastic material constituting the outer surface of the vessel is a polyolefin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- C. than the melting point or softening point of the plastic material constituting the outer surface of the vessel;
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15. A labelled vessel comprising
a plastic vessel formed by blow-molding and a label bonded to the surface of a side wall portion of the vessel by an in-mold labelling operation, wherein the plastic material constituting the outer surface of the vessel is a polyolefin, and the label is a label comprising a drawn plastic film as the substrate and the label is bonded to the vessel so that the residual equilibrium shrinkage factor (Rs), defined by the following formula, of the drawn plastic film is from 0.5 to 100%: - ##EQU4## wherein L1 is the length of the label film peeled from the vessel and L2 is the length of said peeled label film equilibrated at a temperature (T1) lower by 40°
C. than the melting point or softening point of the plastic material constituting the outer surface of the vessel. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
- ##EQU4## wherein L1 is the length of the label film peeled from the vessel and L2 is the length of said peeled label film equilibrated at a temperature (T1) lower by 40°
Specification