Method and apparatus for packing articles in shrink film

A method for packing a series of articles in shrink film, the series of articles including a first group of articles, the shrink film envelope of which is to be shrunk, and a second group of articles, the shrink film envelope of which is to remain unshrunk, the method comprising the steps of:

• enveloping the articles in shrinkage film;
• conveying the series of articles enveloped in shrinkage film on a packing line including a shrinkage tunnel;
• passing the series of articles through the shrinkage tunnel;
• and
• controlling the heat action of the shrinkage tunnel such that during the passage of members of the second group of articles through the shrinkage tunnel, the heat action on the whole shrink film envelope of said articles, is reduced to an amount not sufficient for initiating shrinkage by considerably increasing the speed of travel for members of said second group of articles through the shrinkage tunnel compared with the speed of members of said first group of articles through the shrinkage tunnel for shrinkage.

A method for packing a series of articles in shrink film, the series of articles including a first group of articles, the shrink film envelope of which is to be shrunk, and a second group of articles, the shrink film envelope of which is to remain unshrunk, the method comprising the steps of:

• enveloping the articles in shrinkage film;
• conveying the series of articles enveloped in shrinkage film on a packing line including a shrinkage tunnel;
• passing the series of articles through the shrinkage tunnel;
• and
• controlling the heat action of the shrinkage tunnel such that during the passage of members of the second group of articles through the shrinkage tunnel, the heat action on the whole shrink film envelope of said articles is reduced to an amount not sufficient for initiating shrinkage by reducing the heat action by reducing the heat transfer conditions in the shrinkage tunnel compared with the heat transfer conditions in the shrinkage tunnel during the passage of the members of said first group of articles for shrinkage.

A method for packing a series of articles in shrink film, the series of articles including a first group of articles, the shrink film envelope of which is to be shrunk, and a second group of articles, the shrink film envelope of which is to remain unshrunk, the method comprising the steps of:

• enveloping the articles in shrinkage film;
• conveying the series of articles enveloped in shrinkage film on a packing line including a shrinkage tunnel;
• passing the series of articles through the shrinkage tunnel;
• and
• controlling the heat action of the shrinkage tunnel such that during the passage through the shrinkage tunnel of members of the second group of articles, the heat action on the whole shrink film envelope of said articles is reduced to an amount not sufficient for initiating shrinkage by considerably increasing the speed of travel of members of said second group of articles through the shrinkage tunnel compared with the speed of members of said first group of articles through the shrinkage tunnel for shrinkage and the heat transfer conditions in the shrinkage tunnel are also reduced.