JPS6211765Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sealer used in a packaging machine, and more particularly to a sealer that can perform a suitable sealing operation even when the packaging machine starts operating.

(Prior Art) Generally, in automatic packaging machines, for example,
As disclosed in Japanese Patent Publication No. 25918, a rotary sealer having a heater inside the sealer body is used as a sealing means for packaging materials.

(Problem to be solved by the invention) However, when using the sealer as described above, for example, when performing the sealing work with the sealer set at 240°C as shown in Figure 1, first of all, When the heater of the sealer is turned on to generate heat, the sealer is heated as shown in O to A and the heater is turned off at position A, but despite this, the temperature of the sealer rises to B, which is over 240℃ due to residual heat. After that, the sealer temperature becomes stable between C and D. Next, when the sealer is rotated at point D, the heat from the sealing surface of the sealer is radiated to the packaging material, so the temperature immediately drops below the predetermined 240°C, and then at point F. It had temperature characteristics that would provide an appropriate sealing temperature.
The above-mentioned phenomenon is caused by the fact that the heat dissipation state and other conditions are different between when the sealer is stopped and when it is in operation, as shown in Figure 2. This was due to something out of control.

Therefore, in the conventional method, since the sealing work is performed at a temperature of point D which is higher than the predetermined temperature at the beginning of the sealing work, the packaging material is heated to an unreasonably high temperature and melts, causing the packaging material to melt. Not only was there a problem in that cutting could not be performed, but there was also a problem in that the packaging material could not be heated sufficiently during the fixed period from E to F when the sealer temperature dropped below the predetermined temperature, resulting in a seal failure. It is.

In this way, in the conventional sealer,
When the packaging machine starts operating, the packaging material is heated to a high temperature above a predetermined temperature, and the temperature of the sealer drops for a while after that, making it difficult to perform proper sealing.As a result, when the packaging machine starts operating ( The problem was that a large amount of packaging was lost (including when the company restarted).

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to prevent sealing failure due to a drop in sealer temperature and high-temperature heating at the beginning of the sealing process when starting the operation of a packaging machine. The purpose is to eliminate the occurrence of the situation and allow proper sealing work to be performed.

(Means for Solving the Problems) The present invention provides a method for controlling the temperature of the heater before and after the start of the sealer operation, when conventionally the temperature of the heater for heating the sealer body is controlled. Focusing on the fact that the temperature control could not be performed properly due to the large difference in conditions, we set the temperature control conditions before and after the start of sealer operation to the same conditions, thereby improving the temperature control described above. It was designed to solve the problems of

That is, the gist of the configuration of the present invention is that the heater 4
is provided at an outer position of the sealer body 1, facing or in contact with the sealing surfaces 2, 2' of the sealer body 1 when the operation of the sealer body 1 is stopped, and when the sealer body 1 is in rotation. The sealing surface 2,
2' is provided with a cooling means for cooling it.

(Function) Therefore, in the sealer characterized by the above configuration, when the heater 4 is heated to heat the sealer main body 1 when the operation is stopped, the sealing surface 2,
If the sealer is cooled and the heat consumption is the same or approximately the same as the heat consumption per unit time consumed during sealing work during operation, the heating and heat radiation conditions when the sealer is stopped will be the same as the conditions during operation. This means that the same conditions can be set.

Therefore, if the cooling to the sealing surfaces 2, 2' is stopped at the same time as the sealer starts operating in this state, the heating and heat radiation conditions of the sealer body 1 will be the same before and after the start of the operation. Therefore, not only will the sealing surfaces 2 and 2' not be heated to an unreasonably high temperature at the beginning of the sealing operation, but also the sealing surfaces 2 and 2' will not be heated to an unreasonably high temperature at the beginning of the sealing operation.
Even if the temperature of sealing surface 2' drops, the temperature will quickly return to the predetermined set temperature before the second sealing operation, and the temperature of sealing surfaces 2 and 2' can be controlled very easily and appropriately. That's what happens.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 3, reference numeral 1 indicates a sealer main body having arcuate sealing surfaces 2, 2' formed at its tip.
Reference numerals 4 and 4 indicate heaters installed inside the sealer body 1, and the heaters 4 and 4 are controlled to a predetermined constant temperature by temperature measurement with a temperature measuring element 5 provided on the side surface of the sealer body 1. It is possible.
3 and 3' are sealing surfaces 2 and 3 of the sealer body 1 located outside the position where the sealer body 1 is stopped.
2′ shows the nozzles provided to face each other,
The nozzles 3, 3' can discharge compressed air for cooling.

The present embodiment has the above configuration, and its usage and operation will be explained next.

First, when the sealer is stopped before starting operation, turn on the heaters 4 and 4 and turn on the sealer body 1.
After heating the sealer body 1, compressed air is blown onto the sealing surfaces 2 and 2' from the nozzles 3 and 3'.
The heat consumption is equivalent to the unit heat consumed during the sealing operation during rotational operation, but the heat consumption is equal to the heat consumed when the sealing surfaces 2, 2' contact the packaging material, It is calculated by taking into consideration the amount of heat consumed by air cooling during rotation of the sealer main body 1, and this amount of heat can also be easily obtained as an empirical value through tests or the like.

However, in the above state, the sealer main body 1
The sealing surfaces 2, 2' are cooled by the compressed air from the nozzles 3, 3' while the temperature of the heaters 4, 4 is controlled, so the temperature of the sealing surfaces 2, 2' will never exceed a predetermined set temperature. Undue heating will not occur, and the temperatures of the heaters 4, 4 will be controlled under the same conditions as when operating the sealer.

Therefore, if the cooling operation of the sealing surfaces 2, 2' is then stopped and the sealer is rotated to start the prescribed sealing operation, the sealing surfaces 2, 2' will be at the appropriate temperature first. In the initial stage of the sealing operation, the packaging material is not heated to an unreasonable high temperature, so that the sealing operation can be carried out appropriately.

Furthermore, since the sealing surfaces 2 and 2' subsequently consume heat due to contact with the packaging material, the temperature will temporarily drop, but even in this case, the heater 4, 4 is temperature-controlled under the same conditions as the operating conditions, so the sealing surfaces 2, 2' are quickly returned to the appropriate predetermined temperature, which prevents sealing failure of the packaging material due to insufficient heating. This prevents problems such as the following, and allows proper sealing work to be continued from now on.

In the above embodiment, a nozzle that discharges compressed air is used as a means for cooling the sealing surface when the sealer stops operating, but the present invention is by no means limited to this. For example, as shown in FIG. There is no problem even if the radiator 6 is provided in contact with the sealing surfaces 2, 2' as shown in FIG. In short, any means that can cool the sealing surfaces 2, 2' while the sealer main body 1 is not operating is sufficient, and the amount of heat consumed at that time is not limited to an amount that exactly matches the amount of heat consumed when the sealer is in operation. , there is no problem even if there are some errors within the practical tolerance range.

In addition, the design of the present invention can be changed with respect to the number of heaters 4, the shapes of the sealing surfaces 2, 2', and other specific configurations within the scope of the present invention.

(Effects of the invention) As described above, the present invention separately provides a cooling means to cause the sealing surface to consume heat equal to or approximately the same as the heat consumption when the sealer is in operation while the sealer is not operating. , the heating and heat dissipation conditions of the sealing surface before the sealer starts operating can be set to the same conditions as the sealer operating conditions, so the heater temperature control can be operated even before the sealer starts operating. This means that the sealing surface can be controlled under the same conditions as when the sealing process starts, and there is no need to heat the sealing surface above a predetermined temperature before starting the sealing process. In addition, by suppressing the sudden temperature drop on the sealing surface at the start of sealing work and enabling rapid temperature recovery, it is possible to prevent sealing failures due to insufficient heating during subsequent sealing work. As a result, a special effect has been achieved in that all occurrences of seal failures at the start of operation can be suitably prevented.

Therefore, the present invention can significantly reduce the loss of packaging defects by preventing the seal defects that were conventionally unavoidable at the start of operation of the packaging machine, and its practical value is great. be.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the state of temperature change of a conventional sealer. FIG. 2 is an explanatory diagram showing the temperature distribution of a conventional sealer when it is stopped and when it is in operation. FIG. 3 is a side view showing an embodiment of the sealer according to the present invention. FIG. 4 is a side view showing another embodiment of the present invention. 1...Sealer body, 2, 2'...Seal surface,
3, 3'... Nozzle, 6... Radiator.

Claims (1)

[Claims for Utility Model Registration] 1. At an outer position of the sealer body 1 comprising the heater 4, facing or facing the sealing surfaces 2, 2' of the sealer body 1 when the operation of the sealer body 1 is stopped. for cooling the sealing surfaces 2, 2' in contact with each other so as to consume heat equal to or approximately equal to the heat consumption per unit time consumed during the sealing operation during rotational operation of the sealer body 1; A sealer for a packaging machine, characterized in that it is provided with a cooling means. 2. The sealer for a packaging machine according to claim 1, wherein the cooling means is a nozzle 3, 3' that blows compressed air onto the sealing surfaces 2, 2'. 3. The sealer for a packaging machine according to claim 1, wherein the cooling means is a radiator 6 that contacts the sealing surfaces 2, 2'.