Blow molding method, composite preform, composite container, inner label member, and plastic member
First, a composite preform 70 including a preform 10 a and a plastic member 40 a in close contact with the outer surface of the preform 10 a is made by preparing the preform 10 a made of plastic material and arranging the plastic member 40 a to surround the outer surface of the preform 10 a . Subsequently, the composite preform 70 is heated and inserted in a blow molding die 50 and undergoes blow molding in the blow molding die 50 , by which the preform 10 a and the plastic member 40 a of the composite preform 70 are inflated integrally and a composite container 10 A is obtained.
1. A blow molding method for molding a composite container, comprising:
preparing a preform which is made of plastic material;
arranging a plastic member having heat shrinkability outside the preform;
setting the plastic member in close contact with an outer surface of the preform by heating the plastic member, by a first heating device, to cause it to heat-shrink and make a composite preform;
heating the preform and the plastic member, by a second heating device, and inserting the preform and the plastic member in a blow molding die; and
integrally inflating the preform and the plastic member by performing blow molding on the preform and the plastic member in the blow molding die;
carrying out a first series of processes for making the composite preform in a first factory, the first series of processes including:
preparing the preform,
arranging the plastic member, and
setting the plastic member in close contact with an outer surface of the preform by heating the plastic member by a first heating device;
transporting the composite preform to a second factory; and
carrying out a second series of processes for making the composite container by means of blow molding in the second factory, the second series of processes including:
heating the preform and the plastic member by a second heating device, and
integrally inflating the preform and the plastic member.
2. The blow molding method according to claim 1 , wherein:
the preform includes a mouth part, a trunk part and a bottom part; and
the plastic member is arranged to cover the trunk part and the bottom part of the preform.
3. The blow molding method according to claim 1 , wherein:
the preform includes a mouth part, a trunk part and a bottom part; and
the plastic member is arranged to cover a part of the trunk part and bottom part of the preform.
4. The blow molding method according to claim 1 , wherein the plastic member has a gas barrier property or a ray barrier property.
5. The blow molding method according to claim 1 , wherein the plastic member has been provided with a design or printing.
6. The blow molding method according to claim 1 , wherein the plastic member is made of material having a higher warm keeping property or cool keeping property than the plastic material forming the preform.
7. The blow molding method according to claim 1 , wherein the plastic member is made of material that is less slippery than the plastic material forming the preform.
8. The blow molding method according to claim 1 , wherein the plastic member is an outer contractive member having a function of contracting with respect to the preform.
9. The blow molding method according to claim 1 , further comprising arranging an inner label member to surround the outer surface of the preform,
wherein the plastic member is arranged outside the inner label member.