DE2302288A1 - SHRINK FRAME - Google Patents

Description

PATENT APPLICATION FOR SHRINKING FRAME Name: Shrinking frame Subject: Invention of a heated frame for shrinking the wrapping film.

Title: Shrink Frame Application Example: The invention relates to a heated frame for shrinking shrink film or packaging film.

Purpose: The shrink frame is required to wrap shrink or packaging film, the goods to be packaged are placed around or over the heat generated by the shrink frame releases to shrink the goods - e.g. cardboard boxes, bottles, containers on pallets - is firmly joined together with the shrink frame after treatment and can be transported.

State of the Art: A summary of the state of the art was in the magazine "Materialfluss" Verlag modern industry in the edition Released June 1972.

Then pallets on which goods are stacked are wrapped in shrink film coated and transported to a shrink oven. These shrink ovens are basically Chamber furnaces that use warm air to heat the film and thereby cause it to shrink.

There is also a device that is equipped with a gas jet is. The gas ejector is attached to a lifting frame and is close to the shrink film moved upwards. It is necessary to approach each side individually. The emitter surface has a temperature of 700 - 900-C.

Shrink cannons are hand-held devices from their barrel that are hot Gas leaks. The shrinkage criticism occurs when the hot gases approach the film of the state of the art: The shrink ovens are rigid, immovable structures. They usually require a separate pallet transport. When opening the doors the warm air (approx. 220 C) escapes into the room. The construction and the sunken Cold air must be heated up again with each process.

They are relatively more expensive to purchase and operate.

The efficiency is low. The shrinking times are 30 max. 60 pallets per hour.

The lifting device with gas ejector requires that a pallet four times is approached.

In addition, the radiation with a wavelength of approx. 2.7 um is only 20 the absorption capacity of the film. The energy consumption is correspondingly high and the shrinking times are correspondingly long.

The high permeability of the film at 217 / u is subject to temperature stress of the goods to be packed.

The shrink cannons are hand-held devices. Working with it is right laborious and time consuming.

The reciprocator and the Schrumof cannons require skilled personnel. The shrinkage is mostly uneven.

Task: The invention is based on the task of providing a cheaper, To create a more flexible and economical system for higher throughputs.

Solution: The object is achieved according to the invention in that the shrink frame Radiant surfaces with air outlet openings, essentially facing towards the film consists. the surface temperature is approx. 400 C and thus approx. 807 ° C des Absorption capacity of the shrink film In addition to the radiation, there are also hot gases brought up to the foil.

Another embodiment of the invention: The shrink frame is adjustable so that he can be wet to the different pallet dimensions. He's so following on pillars Can be moved up and down so that the goods can be retracted by means of a forklift is possible from four sides. The shrink frame is movable.

Achievable advantages: 1. The energy requirement is only about half as high than with known shrink systems.

2. The shrinking time is shorter so the throughput can be more than to be doubled.

3. The space requirement is small because only four columns are out of order be in the way.

4. The frame is adjustable according to the stack size.

5. You can use forklift trucks or trolleys from Move four sides into the shrink area.

6. Equipped with rollers, the shrink frame can be moved.

7. All energy sources are possible for heating.

Description of an exemplary embodiment: An exemplary embodiment is shown in the drawing and is described as follows: The shrink frame consists essentially of the insulated frame (1) in which the heat is generated. Metal sheets (2) are attached to the inside of the frame as radiation surfaces serve and be drawn from the inside of the RaK-men. Also have this Sheet metal (2) openings from which hot gases can escape. The hot gases are through Burners, heating rods or the like. Generated and circulated and transported by means of fans.

To adjust the inner free opening, the two angles, from which the Scnrumt frame is formed are shifted to each other. The shrinkage is suspended from four nozzles (3) so that it can, for example, be connected by electric motors the supports can be moved up and down.

Method of operation: The pallet or the goods wrapped in foil are shown on 3. driven into the middle between the supports by means of a forklift. The shrink frame is lowered and pulled up again.

The heat is transferred through the radiation from the hot sheets (9) and the escaping hot air onto the shrink film, which then shrinks and clasped the goods tightly.

After the frame is up again, the packaged goods can be transported away will.

Claims (1)

Claims: Generic term: 1. Shrink frame for generating and transferring radiant heat and hot air to goods that are located in the central area of the shrink frame, in particular for heating shrink film in the stack of goods. More distinctive Part: Characterized by the fact that the heat transfer through a frames that can be moved up and down on supports, the insides of which are covered with radiant panels are equipped, takes place. The radiation plates can also be provided with openings Transfer of hot gas to be equipped. Preamble of the sub-claim: 2nd shrink frame according to claim 1, Characteristic part of the subclaim: characterized in that the entire Construction is movable and the frame is divided so that it can be moved by moving can be adapted to the stack sizes.