from the heating wire 39 while the film is kept pinched forming a sleeve around the article a a transfer device 47 wherein pushing members 47 34 are secured to a chain 47 39 in an appropriate spaced relation to one another functions to deliver the sleeve wrapped article a into a pinching device d by means of the pushing members 47 34 the pinching device d includes chains 48 and belts 49 progressively descending with respect to flow direction of the article a and the belts 49 are held pressed against the chain 48 by pressing members 50 as shown in fig4 the slanted plates 51 refer to fig1 serve to help pull both sides of the film sandwiched in between the chains 48 and belts 49 outwards folders 52 are located at the front of the slanted plates 51 so that the both open sides of the sleeved film which has been elongated while it passes through the slant plates 51 are folded down and applied to the bottom of the article as they pass through the folders 52 which are formed so as to decrease progressively the clearance between the folders 52 along the direction that the article a proceeds a device e is a known type of heat sealing conveyor for heat sealing the folded down portion of the film and for discharging the heat sealed article however the pinching device d mentioned above is positioned further into the middle of the folders 52 so that the article can be transferred to the folders 52 with the film being pinched a pusher 54 interrupts upward movement of the article a when it is sleeve wrapped.