Wrapping member attaching method and wrapping member attaching device

1. A wrapping member attaching method for attaching a wrapping member to a container comprising the steps of:

conveying the container;

preheating the container in such a manner that the container collides with a contact means to rotate the container in a circumferential direction while entering a gap between a first and a second container preheating means along the contact means, the first and the second container preheating means arranged to face with each other in parallel, each having a blowout face for preheating a portion of the container and arranged inclined with respect to the conveying direction of the container, the contact means is included in the first container preheating means and is arranged adjacent to the blowout face of the first container preheating means;

surrounding the container with the wrapping member; and

heating the wrapping member by a wrapping member heating means at a temperature not less than a shrinkage starting temperature of the wrapping member so as to shrink the wrapping member around the container and attach the wrapping member to the container.

2. The wrapping member attaching method according to claim 1 , further comprising the step of suppressing the container, which has been preheated by the first and the second container heating means, by a self-cooling suppressing means, from being self-cooled between the first and the second container preheating means and the wrapping member heating means.

3. A wrapping member attaching device for attaching a wrapping member to a container, comprising:

a first and a second container preheating means arranged to face with each other in parallel and each having a blowout face for preheating a portion of the container;

a wrapping member arranging means for arranging the wrapping member in such a manner that the container can be surrounded by the wrapping member;

a wrapping member heating means for heating the wrapping member to a temperature not less than a shrinkage starting temperature of the wrapping member so that the wrapping member can be shrunk around the container and attached to it; and

a conveyer for conveying the container, the first and the second container preheating means, the wrapping member arranging means and the wrapping member heating means are arranged in this order in a conveying direction of the conveyer;

wherein the first and the second container preheating means are arranged being inclined with respect to the conveying direction of the conveyer in such a manner that the blowout face of the first container preheating means can be seen from the upstream side of the conveying direction of the conveyer;

wherein the first container preheating means includes a container rotating means for rotating the container, the container rotating means is a contact member which is arranged being adjacent to the blowout face of the first container preheating means; and

wherein when the conveyer conveys the container, the container collides with the contact means to rotate in a circumferential direction of the container while entering a gap between the first and the second container preheating means along the contact means so that the container is preheated.

4. The wrapping member attaching device according to claim 3 , further comprising a self-cooling suppressing means for suppressing the container, which has been preheated by the first and the second container preheating means, from being self-cooled between the first and the second container preheating means and the wrapping member heating means.

5. The wrapping member attaching device according to claim 4 , wherein the container preheating means and/or the wrapping member heating means is a steam type heating device.

6. The wrapping member attaching device according to 4 , wherein the container preheating means and/or the wrapping member heating means is a hot air type heating device.

7. The wrapping member attaching device according to claim 3 , wherein the container preheating means and/or the wrapping member heating means is a steam type heating device.

8. The wrapping member attaching device according to claim 3 , wherein the container preheating means and/or the wrapping member heating means is a hot air type heating device.