| 摘要 |
The invention relates to a packaging, preferably for foodstuffs, said packaging comprising a container and a lid, both of which is made of a material which is suitable for injection moulding, said lid being sealable relative to the container; and wherein the lid comprises an elevated portion for abutment on the internal, upper edge of the container, wherein at least a portion of the lid (2) is made with a sealing zone (7, 8) for joining with the container (1), said sealing zone (7, 8) being added with an active material which, by influence during joining, changes the material in the sealing zone (7, 8) to the effect that the sealing becomes weaker than the surrounding material, whereby the scaling is, upon opening, broken in the joint and not in the surrounding material. The invention also relates to a method of sealing the above packaging, wherein a material is added which, during the sealing procedure, changes the material in the joint to the effect that the seal becomes weaker than the surrounding material, whereby, when opened, the seal is broken in the joint and not in the surrounding material. |
| 主权项 |
1. A packaging comprising a container and a lid, each of said container and lid being made of a crystalline plastics material which is suitable for injection moulding, said lid being sealable to the container via welding or joining by supplying heat, wherein the lid comprises an elevated area for abutment on an upper edge of the container, wherein at least a portion of the lid is made with a sealing zone for joining with the container, wherein at least a portion of the container is made with a sealing zone for joining with the lid, said crystalline plastic material of at least one of said lid and said container containing an active material which ensures that a seal formed between the sealing zones of the container and the lid via welding or joining by supplying heat is weaker than surrounding material, such that when the seal is broken, the breaking point will be in the seal and not in the surrounding material, the active material being added to moulding material of the sealing zone of at least one of said lid and said container prior to injection moulding and wherein said active material included in said sealing zone of at least one of said lid and said container is deposited in peripheral areas of crystalline grains formed in the moulding material during/following injection moulding. |
