GB2193187A

GB2193187A - Method of heating the twist- closed ends of sweet wrappers and an apparatus for this purpose

Info

Publication number: GB2193187A
Application number: GB08714765A
Authority: GB
Inventors: Werner Kmoch; Michael Aurin; Peter Pietsch
Original assignee: Nagema VEB
Current assignee: Nagema VEB
Priority date: 1986-07-02
Filing date: 1987-06-24
Publication date: 1988-02-03
Anticipated expiration: 2007-06-24
Also published as: DE3717621C2; DD250692A1; CH673447A5; IT8748088A0; GB8714765D0; GB2193187B; IT1216824B; JPS6396011A; JPH0356972B2; DE3717621A1

Description

1 GB2193187A SPECIFICATION By the use of the specially constructed rotary

grippers or removal members disposed behind Method of heating wrapping material them, or of both, these members can be brought into the working sequence, so that a This invention relates to a method of heating 70 continuous method of operation is possible.

wrapping material in wrapping machines for Apparatus solutions will be explained in sweets (candies) with twist folding, by means more detail below by reference to an example of which the wrapping material is plasticized of embodiment thereof.

at the twist position and to an apparatus for The figures in the associated drawing show:

carrying out this method. 75 Figure 1 a partial view of the twisting appa A method for the heating of the wrapping ratus comprising a removal member equipped material has been disclosed by DE- with removers, OS2226710. In the procedure described Figure 2 the rotary grippers passing through there, the twist zone of the wrapping material an induction coil, is to be plasticized by blowing-on by hot air 80 Figure 3 a lateral view of Fig. 2, or by radiant energy. For realizing this pro- Figure 4 view A-A according to Fig. 2, cess, corresponding blowing nozzles or heat Figure 5 a sweet (candy) wrapped with radiators are provided. packing material with closed removal grippers In this method of proceeding it is not pos- and still closed rotary grippers.

sible to plasticize the wrapping material solely 85 An apparatus for directly heating wrapping in the twist zone, because due to the scatter material folded around a sweet (candy) con of the hot air or the radiant energy neighbour- sists of a wrapping wheel 1, which is ing zones, including the functional elements equipped in known manner with rotary grip situated in these zones, are always also pers 2. These rotary grippers 2 are of a plas- heated. 90 tics material and are furnished on the working Furthermore, this procedure is suitable only surfaces with a metal disc 3. Induction coils 4 for intermittent operation, because sufficiently are so arranged in the machine frame that a long time must be available for satisfactory rotary gripper of each pair of rotary grippers plasticizing and the heating members are can pass through these coils in the open posi mounted fixed, 95 tion just before the closure operation (Fig. 2).

The objective of the present invention is to In this solution, the metal discs 3 are induc eliminate energy losses and to extend the field tively heated. Immediately after passage of use to a continuous working process. through the induction coils 4, the rotary grip The task is to transfer the heat energy only pers 2 are brought together and grip the free in the twist zone, without heating the periph- 100 ends of the wrapping material, with the result eral zones. According to the invention this that the heat energy stored in the metal discs task is achieved in that the heating takes 3 is transfered to the wrapping material and place by direct contact with a solid heat en- thus plasticizes this material. In this plasticized ergy carrier. condition, the wrapping material is twisted in The heating takes place immediately after 105 known manner and cannot, - after release, again the twisting while tke wrapping material is still spring open.

held, but may also take place during the twist- In another solution, a removal wheel 5, ing operation or by both types of heating. equipped with removal grippers 6 (Fig. 1), is Removal members disposed behind the ro- disposed behind the wrapping wheel 1.

tary grippers or the rotary grippers them- 110 The removal heads 7 of the removal grip selves, equipped with a metallic working sur- pers 6 are made sufficiently thin to fit into the face, are-us ed as heat energy carriers. region between the sweet (candy) and rotary The heating of the heat energy carriers gripper 2 (Fig. 5). The removal heads 7 are of takes place by resistance heating or by an a ceramic material and are furnished with a inductive field. An apparatus for heating 115 metal foil, which is supplied with electrical en wrapping material for realizing the above-deergy via a conductor 8 and thus is directly scribed method consists in that the twisting heated. It is also possible to make the re apparatus, equipped with rotary grippers of moval heads of metal and to heat then induc plastics material furnished with a metallic tively, as described in the first solution.

working surface, is followed by a removal 120 In this solution, the ends of the wrapping member furnished with removal clamping hol- material are twisted-in in known manner. After ders, the removal gripper of which member the twisting operation has been completed, has the same width as the immediate twist while the rotary grippers 2 a re still closed, the position of the wrapping material. The removal removal grippers 6 are brought together, in grippers are constructed as slender ceramic 125 the manner known for rotary grippers, and elements, the working surfaces of which are grip the wrapped sweet or candy on both furnished with a thin metal coating. sides in the region between it and the rotary In this method of proceeding, due to the gripper 2 (Fig. 5). At this instant, the rotary direct heat transfer, no scattering takes place, grippers 2 are opened. The heat energy so that only the twist position is plasticized. 130 stored in the removal heads 7 is now trans- 2 GB2193187A 2

Claims

ferred directly in the twist zone to the wrapp- 12. Apparatus as claimed

in Claim 9, sub ing material, causing the latter to be plasti- stantially as described with reference to the cized. After the removal grippers 6 have been accompanying drawings.

opened, the twist positions cannot again Published 1988 at The Patent Office, State House, 66/71 HighHolborn, spring open. In this solution, the rotary grip- London WC 1 R 4TP. Further copies may be obtained from pers 2 do not need to be heated and may be The Patent Office, Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD.

constructed in known manner. It is, however, Printed by Burgess & Son (Abingdo. n) Ltd. Con. 1/87.

also possible to combine both these variants of heating. Where the heating variant accord- ing to the first described solution is used, the removal wheel 5 may be dispensed with.

CLAIMS 1. Method of heating wrapping material in sweet (candy) wrapping machines with twist folding, by means of which the wrapping material is plasticized at the twist position, characterized in that the heating takes place by direct contact with a solid heat energy carrier.
2. Method according to Claim 1, character ized in that the heating takes place immedi ately after twisting while the wrapping material is still held.
3. Method according to Claim 1, character- ized in that the heating takes place during the twisting.
4. Method according to Claim 1, characterized in that the heating takes place during the twisting and immediately after the twisting while the wrapping material is still held.
5. Method according to Claim 1 and 2, characterized in that removal members disposed behind the rotary grippers are used as heat energy carriers.
6. Method according to Claims 1 and 3, characterized in that rotary grippers of plastics material with a metallic working surface are used as heat energy carriers.
7. Method according to Claims 1 to 6, characterized in that the heating of the heat energy carriers takes place by resistance heating.
8. Method according to Claims 1 to 6, characterized in that the heating of the heat energy carriers takes place by an inductive field.
9. Apparatus for heating wrapping material in sweet (candy) wrapping machines with twist folding, comprising a twisting apparatus equipped with rotary grippers, for realizing the method according to Claims 1 to 6, characterized in that the twisting apparatus is followed by a removal member equipped with removal clamping holders, the removal clamping holders of which (member) have the same width as the immediate twist position of the wrapping material.
10. Apparatus according to Claim 9, characterized in that the removal clamping holders are constructed as slender ceramic elements, which are equipped on their working surfaces with a thin metal layer.
11. A method as claimed in Claim 1, sub- I stantially as described in the example dis- closed herein.