Tamper-evident envelope, process of manufacturing of said envelope and use thereof for containing products

A tamper-evident envelope of sheet material, comprising:

• at least one rear wall,
• at least one first front flap engaged with the rear wall,
• at least one second front flap also engaged with the rear wall opposite to said first front flap,
• wherein the first and second front flaps are configured for defining at least one closed condition wherein these latter at least partially overlap each other, wherein the first and second front flaps are further configured for defining at least one open condition, wherein these latter are distanced from each other,
• said envelope further comprising at least one safety device of sheet material, said safety device comprising:
• at least one first coupling portion borne by the first front flap,
• at least one second coupling portion borne by the second front flap,
• the first and second coupling portions being configured for stably engaging with each other during a first closed condition of the first and second front flaps,
• at least one between the first and second coupling portions exhibiting at least one removable portion configured for separating from at least one between the first and second front flap after a first opening condition thereof subsequent to said first closed condition for preventing a subsequent coupling of said first and second coupling portions and for revealing tampering with the envelope,
• at least one support portion directly constrained to at least one between the second front flap and the second coupling portion,
• wherein the support portion is configured—at least during an initial contact step between the first and second coupling portions before said first closed condition of the first and second front flaps—for supporting at least part of said second coupling portion,
• wherein the support portion comprises a weakening portion configured for enabling the support portion to define at least the following operative conditions:
• a holding operative condition—defined during an initial step of the first closed condition of the first and second front flaps, during which the first coupling portion abuts on the second coupling portion—wherein the weakening portion is intact and enables the support portion itself to support the second coupling portion by limiting the movement thereof,
• a releasing operative condition—defined at least during the first closed condition of the first and second front flaps—wherein the weakening portion is broken so that the support portion can enable a movement of the second coupling portion greater than the movement enabled under the holding operative condition,
• said weakening portion being configured for enabling the support portion to switch from the holding condition to the releasing one when the first closed condition of the first and second front flaps is defined and during the engagement condition of the first and second coupling portions.

A tamper-evident envelope of sheet material, comprising:

• at least one rear wall,
• at least one first front flap engaged with the rear wall,
• at least one second front flap also engaged with the rear wall opposite to said first front flap,
• wherein the first and second front flaps are configured for defining at least one closed condition wherein these latter at least partially overlap each other, wherein the first and second front flaps are further configured for defining at least one open condition, wherein these latter are distanced from each other,
• said envelope further comprising at least one safety device of sheet material, said safety device comprising:
• at least one first coupling portion borne by the first front flap,
• at least one second coupling portion borne by the second front flap,
• the first and second coupling portions being configured for stably engaging with each other during a first closed condition of the first and second front flaps,
• at least one between the first and second coupling portions exhibiting at least one removable portion configured for separating from at least one between the first and second front flap after a first opening condition thereof subsequent to said first closed condition for preventing a subsequent coupling of said first and second coupling portions and for revealing tampering with the envelope, wherein the second coupling portion comprises at least one hook defining at least one undercut portion delimited by a gripping edge,
• wherein the first coupling portion comprises at least one respective hook defining at least one undercut portion delimited by a respective gripping edge,
• said hooks, respectively of the first and second coupling portions, being configured for stably engaging with each other at least during the first closed condition of the first and second front flaps, said hooks—under the first closed condition of the first and second front flaps—exhibiting respective mutually facing concavities,
• wherein the removable portion is defined by at least a part of the hook of the second coupling portion.