本发明之课题系在于对由热塑性树脂制构件所形成的容器，使用二轴延伸聚丙烯薄膜作为盖材薄膜时，内容物的保护性高，取出内容物时，可容易地剥离，又剥离性容易控制、耐压性高，且在剥离时二轴延伸聚丙烯薄膜不容易撕裂的接合构造。本发明之解决手段系在于本发明的接合构造之形成方法，其特征在于：将含有密封胶层(A2)之二轴延伸薄片(A)与含有密封胶层(B2)之热塑性树脂制构件(B)热融接，于该热融接部分形成具有剥离性之接合构造的方法，于该二轴延伸薄片(A)之密封胶层(A2)，包含聚丙烯系无规共聚物(PPA)，于该该热塑性树脂制构件(B)之密封胶层(B2)，包含低熔点聚丙烯系无规共聚物(PPB)，低熔点聚丙烯系无规共聚物(PPA)之丙烯单位的含有质量与低熔点聚丙烯系无规共聚物(PPB)的丙烯单位的含有质量的差(PPA-PPB)/PPB×100(%)，在±5%以内。

To provide a forming method of bonding structure which has strippable property. For the container made of thermoplastic resin member, biaxial stretching polypropylene film is used as the cover membrane so that the content of the container is highly protected; upon taking out the content, the membrane can be easily controlled to strip off and is resistant to pressure, and the bonding structure has the property that the biaxial stretching polypropylene film is not easy to be torn in stripping off. The bonding structure is characterized in that: thermal fusing of the biaxial stretching thin sheet (A) containing sealing adhesive layer (A2) with the thermoplastic resin member (B) containing sealing adhesive layer (B2), and the thermally fused portion provides the strippable property in this forming method of bonding structure. The sealing adhesive layer (A2) of the biaxial stretching thin sheet (A) contains polypropylene series random copolymer (PPA). The sealing adhesive layer (B2) of the thermoplastic resin member (B) contains low melting point polypropylene series random copolymer (PPB). The difference in existing mass of propylene unit between the low melting point polypropylene series random copolymer (PPA) and the low melting point polypropylene series random copolymer (PPB) [(PPA-PPB)/PPB×100(%)] is within ± 5%.