Process for firmly bonding a thermoplastic covering sheet on a hard article
AssigneeUbe Industries, Ltd.
InventorsMatsushita Masaaki, Terado Tetsuo
Life of this patent
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Abstract
A process for firmly bonding a thermoplastic covering sheet on a hard article, for example, a steel pipe or cable, comprising wrapping a heat-shrinkable covering sheet having an adhesive layer around a portion of the peripheral surface of a hard article to be protected and heating the covering sheet so as to shrink it, which process is characterized by placing a pressing band on the covering sheet and by creating a pressure in the pressing band, so as to press the covering sheet against the hard article, thereby removing air bubbles formed between the covering sheet and the hard article.
Claims11
A process for firmly bonding a thermoplastic covering sheet to a hard article, comprising:
- covering a portion of the peripheral surface of a hard article with a heat-shrinkable thermoplastic covering sheet having an adhesive layer;
- and
- heating said covering sheet around said hard article at a high temperature sufficient for causing said covering sheet to shrink, whereby said covering sheet becomes fastened on the peripheral surface portion of said hard article,
- which process is characterized in that the covering sheet on said hard article is wrapped with a pressing band comprising a hollow belt which is flexible;
- and during or after said heating procedure, a fluid within the hollow space in said hollow belt is pressurized, whereby said covering sheet is pressed against said hard article.
A process for firmly bonding a thermoplastic covering sheet to a hard article, comprising:
- surrounding a portion of the peripheral surface of a hard article with a heat-shrinkable thermoplastic covering sheet having an adhesive layer;
- heating said covering sheet around said hard article at a high temperature sufficient for causing said covering sheet to shrink, whereby said covering sheet becomes secured to the peripheral surface portion of said hard article,
- wrapping said covering sheet on said hard article with a pressing band comprising an elastic hollow belt;
- during or after said heating step introducing pressurized fluid within said hollow belt to cause said belt to expand and press said covering sheet against said hard article,
- said belt having a longitudinally oriented central hollow compartment and a longitudinally oriented lateral hollow compartment on said side of said central compartment, said pressurized fluid being introduced into said central compartment and thereafter being introduced into said lateral compartments, so that any air trapped between said covering sheet and said hard article is pressed out laterally of said belt.
Dependencies are inferred from the claim text.