Double-sided pressure-sensitive adhesive tape or sheet

A double-sided pressure-sensitive adhesive tape or sheet having a first pressure-sensitive adhesive surface and a second pressure-sensitive adhesive surface,

• the double-sided pressure sensitive adhesive tape or sheet comprising at least a bubble-containing pressure-sensitive adhesive layer, a first releasable liner and a second releasable liner,
• said first releasable liner comprising a first substrate and a heavier releasing-side releasably treated layer formed by an ionizing radiation-curable silicone releasing agent on one side of the first substrate,
• said second releasable liner comprising a second substrate and a lighter releasing-side releasably treated layer formed on one side of the second substrate,
• wherein the heavier releasing-side releasably treated layer is employed onto the first pressure-sensitive adhesive surface and the lighter releasing-side releasably treated layer is employed onto the second pressure-sensitive adhesive surface, and
• wherein the lighter releasing-side releasably treated layer is formed by a thermally curable silicone releasing agent.