JP2002234511A - Heat seal roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase heat sealing efficiency by controlling a drop in temperature of a heat sealing knife surface in heat sealing. SOLUTION: This relates to a pair of heat sealing rolls 1 mutually driven in opposite directions and provided with film touching panels 3, 4 projecting outward in the radius direction of the rolls positioned on each front side and back side in the rotating direction of a heat sealing knife 2 extending in an roll axis direction. The tip end of the panels projects beyond the surface of the knife for touching a packaging film 5 before the heat sealing knife 2 works and the same moves back to the surface position of the knife 2 when the knife 2 works.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat seal roll for sealing foreign substances continuously or intermittently supplied between packaging films via a filling nozzle or the like, and more particularly to a horizontal heat seal. With respect to the roll, the heat sealing efficiency is improved.

[0002]

2. Description of the Related Art In addition to liquids, kneading, wasabi, and other high-viscosity substances and other liquid-packaged objects are sealed with an impurity seal using an automatic filling device or the like, and used for packaging mainly made of synthetic resin materials. In the case of packaging with a film packaging bag, for example, a liquid to-be-packaged product is continuously supplied through a filling nozzle between packaging films which are vertically sealed by a vertical heat seal roll and formed into a substantially cylindrical shape. While pressing the liquid packaging material with the heat sealing blade of the horizontal heat sealing roll on the packaging film,
It is common to apply horizontal seals at predetermined intervals in the length direction of the film.

FIG. 6 is a cross-sectional view showing a horizontal heat seal roll. In FIG. 6, reference numeral 111 denotes a pair of rolls which are arranged parallel to each other in close proximity to each other and 112 denotes a pair.
In the drawing, heat seal blades are provided at each of the rolls 111 and project outward in the radial direction and extend in the roll axis direction. Reference numeral 113 denotes a packaging film which has been formed into a substantially cylindrical shape by being vertically sealed in advance by a vertical heat seal roll (not shown), and 114 denotes a liquid packaged material continuously supplied between the packaging films, for example, Indicates a liquid.

In such a horizontal heat seal roll, the heat seal blades 112 of each roll 111 are displaced close to each other as shown in FIG. The heat-sealing blades 112,
As shown in FIG. 6 (b), the heat sealing is started by sandwiching the packaging film 113 under heating at the front side in the rotation direction. As shown in FIGS. 6 (c) and 6 (d), such heat sealing is performed by the continuous synchronous rotation of the two heat sealing blades 112 with the rotation of the roll 111.
While pushing back the upper side of the packaging film 113, it gradually progresses to the upper side of the packaging film 113, and as shown in FIG. , One horizontal seal based on the fusion of the sealant layer of the packaging film 113 is performed.

[0005]

However, in such a prior art, before the heat seal blade 112 fully exerts its original function, the heat sealing blade 112 passes through the packaging film 113 to form a packaged object. It comes into contact with the liquid 114 for a relatively long time, for example, as shown in FIG.
When the film is constricted and deformed as shown in FIG. 6, the entire surface of the heat sealing blade 112 is used. During the heat sealing process as shown in FIGS. Since heat is transferred to the liquid 114 from the rear portion in the rotation direction, which contributes to the heat, the surface of the heat seal blade 112 heated to a set temperature by a roll built-in heater or the like (not shown) exerts a heat seal function. At that point, it is considerably lower than the set temperature,
On the other hand, the liquid 11 supplied between the films at a temperature of 20-30 ° C.
4 is a portion near the heat seal blade 112, for example, at 80 ° C.
It was heated up to above.

Accordingly, by applying heat and pressure to the packaging film by the opposing heat sealing blades 112, a sufficient amount of heat is supplied from the surface of the heat sealing blades 112 to the sealant layer of the packaging film 113, and the fusion is reliably performed. In order to realize the above, it is necessary to increase the contact time of the heat sealing blade surface with the packaging film 113, and as a result,
The heat sealing efficiency and, consequently, the filling operation speed of the liquid 114 must be reduced.

It is conceivable to cope with a decrease in the temperature of the heat seal blade 112 by increasing the set temperature of the heat seal blade 112. However, the set temperature of the heat seal blade 112 is usually lower than the heat seal efficiency. For the purpose of improvement, contact the heat seal blade surface for a long time,
(3) The temperature is raised to the allowable limit temperature of the outer surface forming layer of the packaging film, that is, the base film layer, which is continuously heated by the heat sealing blade 112 from the start of the necking deformation to the end of the heat sealing. Therefore, the set temperature cannot be increased unnecessarily, and in that case, the heating control corresponding to the temperature distribution on the surface of the heat seal blade caused by the amount of heat removed from the heat seal blade 112 by the supplied liquid 114. There was another problem that required.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem of the prior art. By reducing the indirect contact time with the object via the packaging film and suppressing the temperature decrease of the heat seal blade surface itself, the heat setting temperature of the heat seal blade rises, It is an object of the present invention to provide a heat seal roll that does not require heating control and can greatly improve heat seal efficiency.

[0009]

SUMMARY OF THE INVENTION A heat seal roll according to the present invention is provided on a pair of rolls which are arranged parallel to each other in close proximity to each other, are driven to rotate in opposite directions to each other, and project outward in the radial direction. A heat-sealing blade extending in the roll axis direction, wherein the film for packaging is sandwiched between the two heat-sealing blades and fused, and the heat-sealing blade provided on at least one of the rolls is located on the front side in the rotation direction of the roll. In at least one of the portion and the rear side portion, the tip is positioned so as to protrude from the surface of the heat sealing blade, contacts the film for packaging prior to the action of the heat sealing blade, and heat seals the action of the heat sealing blade. A film contact plate displaced to the blade surface position or to the rear side thereof is provided. Here, preferably, a film contact plate is provided on each heat seal blade of both rolls.

In this heat sealing roll, at least one, and preferably both, of the heat sealing blades that cooperate with each other to perform the required heat sealing, the heat sealing blade itself contacts the packaging film to heat and heat it. Before pressurizing, the heat transfer from the surface of the heat sealing blade to the liquid packaged object, and thus, by moving the packaging film away from the surface of the heat sealing blade as far as possible under, for example, the projecting displacement of the film contact plate. Since it is possible to effectively prevent the temperature of the heat seal blade from lowering, it is possible to heat seal the packaging film with the heat seal blade having a temperature sufficiently close to the set temperature. Instead of shortening the contact time between the heat seal blade surface and the film without raising Realization becomes possible, greatly improves the heat-sealing efficiency can increase the filling operation speed of the liquid packed material.

This is more effective when both the heat sealing blades cooperating with each other are provided with a film contact plate to prevent both the heat sealing blades from lowering in temperature. As for the heat seal blade, it is preferable to provide a film contact plate on each of the front side and the rear side in the rotation direction of the heat seal blade to ensure more reliable separation of the packaging film from the heat seal blade.

By the way, the film contact plate can be made movable forward and backward with respect to the surface of the heat seal blade, or can be made swingable with respect to the heat seal blade. At least one of spring biasing in the protruding direction and cylinder driving, and the latter can be realized by using a hinge mechanism, a link mechanism and the like and a spring or a cylinder, respectively.

In the case where a spring is used, when the external force acting on the film contact plate in the retreating direction overcomes the spring force, the retreat displacement of the contact plate and when the spring force is lost, When the advance displacement is automatically performed, and when driving by a cylinder or the like is performed, the advance / retreat displacement is performed at the expected timing.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention in a case where a film contact plate is provided on both heat sealing blades of a horizontal heat sealing roll which cooperate with each other. In the drawing, reference numeral 1 denotes a pair of rolls which are disposed in parallel with each other in proximity to each other and are driven to rotate in opposite directions to each other. In the place where four heat seal blades 2 extending in the circumferential direction are provided at equal intervals in the circumferential direction, each heat seal blade 2 is adjacent to each of the front side and the rear side in the roll rotation direction,
The film contact plates 3 and 4 urged in the advance direction by the respective springs 3a and 4a are disposed under a heat insulating state with respect to the heat seal blade 2, respectively. Here, this heat insulation state means not only that an air layer (gap spaced apart) and other heat insulation means are interposed between them, but also that the film contact plate itself is made of plastic, ceramics, metal, etc. This can be realized by using a material or the like.

Based on the pressing force of the springs 3a, 4a, the leading ends of the film contact plates 3, 4 protrude from the surface of the heat seal blade, in particular, the surface portion close to themselves. Prior to the action of the part, and thus the action of the heat sealing blade 2, the sealing film 5 comes into contact with the packaging film 5 which has been longitudinally sealed in advance and has a cylindrical shape. On the other hand, the film abutting plates 3 and 4 are applied to the film abutting plates 3 and 4 by the action of the heat sealing blade 2, more directly, the action of the above-mentioned adjacent surface portion. Due to the component force in the retreating direction that exceeds the pressing force, the retreating displacement is performed to the surface position of the heat seal blade 2.

Here, the cylinders that cause the film contact plates 3 and 4 to move forward and backward are replaced by the springs 3a and 4a, respectively.
Alternatively, when additionally provided, the film contact plates 3, 4
Regardless of the magnitude of the input to the contact plate, the contact plates 3 and 4 can be moved forward and backward at required timing.

According to the horizontal seal roll configured as described above, in the step of forming a constricted portion as shown in FIG. Each of the film contact plates 3 and 4 protruding forward from the blade surface causes a constriction deformation of the film 5, thereby effectively preventing the heat seal blade 2 from contacting the film 5. The heat transfer from the surface of the sealing blade to the liquid packaged object, for example, the liquid 6 flowing down in the packaging film 5 can be prevented, so that the temperature of the heat sealing blade 2 can be advantageously prevented from lowering.

Then, based on the further rotation of the roll 1,
In heat sealing under the cooperation of the two heat sealing blades 2, first, as shown in FIG.
The film abutting plate 3 disposed in the front side in the rotation direction is displaced backward, and the front end in the rotation direction of the surface of the heat seal blade sandwiches the packaging film 5 and is heated and pressed.

At this time, the film contact plate 4 disposed on the rear side in the rotation direction is still in the protruding state, and the packaging film 5, and eventually the liquid in the film, comes into contact with the surface of the heat sealing blade. 2 is effectively restrained, the heat transfer from the heat sealing blade 2 to the liquid 6, in other words, the unnecessary temperature decrease of the heat sealing blade 2 is sufficiently prevented. ), While the heat sealing as shown in FIG.
Is continued until it is completely retracted.

As can be seen from FIG. 2 (c), the film contact plate 3 on the front side in the rotation direction projects immediately after the heat sealing blade surface portion adjacent to the film contact plate 3 has completed the heat sealing function. Displaced to ensure that the film 5 is separated from the heat seal blade surface, thereby preventing excess heat transfer from the heat seal blade 2 to the film side, so that the heat seal blade 2 can quickly recover its temperature. Can be effectively contributed to this, as shown in FIG.
As shown in (d), the film contact plate 4 on the rear side is completely retracted, and continues until the rear end portion in the rotational direction of the surface of the heat seal blade functions.

FIG. 3 is a longitudinal sectional view of a main part showing another embodiment. This embodiment is different from that of FIG. 1 in that a film contact plate is provided only on the front side in the rotation direction of the heat seal blade. 2
The structure is the same as that shown in FIG. 1 except that the film contact plate 4 on the rear side in the rotation direction is omitted. According to this structure, the film contact plate 3 from the heat seal blade surface
In the step of constricting and deforming the film 5 shown in FIG. 3A under the amount of protrusion selected in advance, the packaging film 5 can be sufficiently separated from the surface of the heat sealing blade.
In the heat sealing step shown in (b) and (c), the portion after the heat sealing can be reliably separated from the surface of the heat sealing blade.

Accordingly, in this structure, since there is no film contact plate on the rear side in the rotation direction, as shown in FIG.
Although it is difficult to sufficiently prevent heat transfer from the heat seal blade 2 to the liquid 6 during a process such as heat sealing, a decrease in the temperature of the heat seal blade is sufficiently reduced as compared with the conventional technology. Can be done.

FIG. 4 shows a case where the film contact plate 4 is provided only on the rear side in the rotation direction of the heat seal blade 2, and according to this, the film contact plate 4 shown in FIG. 5
The packaging film 5 is sufficiently separated from the surface of the heat sealing blade in the constriction deformation step, and the heat sealing blade surface portion which will exhibit the heat sealing function in the middle of the heat sealing shown in FIG. 4 (b). By separating the film 5 from the heat sealing blade 2, a decrease in temperature of the heat seal blade 2 can be effectively prevented.

As described above, the case where the film contact plate is moved forward and backward with respect to the packaging film has been described.
It is also possible to swing and displace with respect to the heat seal blade by a hinge function, a link mechanism or the like. FIG. 5 is a diagram illustrating the operation of the film contact plate in that case. In this configuration, the fim contact plates 13 and 14 provided on the front and rear sides in the rotation direction of the heat seal blade 2 are rotatable around fulcrums provided at their rear end portions. Here, in relation to the protruding lengths of the tips of the film contact plates 13 and 14 from the surface of the heat sealing blade, in the step of deforming the film 5 shown in FIG. 5A and 5B, the film contact plate 13 located on the lower side of the figure is separated from the heat seal blade 2 at the start of heat seal, as shown in FIG. 5A, and at the intermediate point of the heat sealing, as shown in FIG.
Is also swung away from the heat seal blade 2, and at the end of the heat seal, the lower contact plate 13 is returned to a position following the heat seal blade 2 as shown in FIG. .

With these features, the heat transfer from the heat seal blade 2 to the filling liquid 6 can be prevented in substantially the same manner as described above, and the temperature of the heat seal blade 2 can be sufficiently prevented from lowering. , As a result, heat sealing efficiency,
As a result, the efficiency of filling and packaging the liquid packaged object can be greatly improved.

The film abutting plate that swings and displaces in this manner can also be provided only on one of the front side and the rear side in the rotation direction of the heat sealing blade 2. By causing 13 and 14 to act in the same manner as shown in FIG. 5, a decrease in the temperature of the heat seal blade can be effectively prevented.

[0027]

As is apparent from the above description, according to the present invention, in particular, at least one of the mutually cooperating heat sealing blades, the front part and the rear part thereof in the roll rotation direction. In at least one of the portions, the tip protrudes from the surface of the heat seal blade, contacts the packaging film prior to the action of the heat seal blade, and contacts the surface position of the heat seal blade or more in the action of the heat seal blade. By disposing a film abutting plate that is displaced backward, unnecessary heat transfer from the surface of the heat seal blade to the liquid package is effectively prevented, in other words, temperature decrease of the heat seal blade due to the heat transfer. As a result, it is possible to increase the heat sealing speed, etc., and also to reduce the set temperature, thereby greatly improving the heat sealing efficiency. It can be. On the other hand, it is also possible to prevent quality deterioration due to unnecessary heating of the liquid packaged object.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the operation of a horizontal heat seal roll.

FIG. 3 is a sectional view of a main part showing another embodiment.

FIG. 4 is a cross-sectional view of a main part showing another embodiment.

FIG. 5 is a cross-sectional view of a principal part showing still another embodiment.

FIG. 6 is a longitudinal sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll 2 Heat seal blade 3,4,13,14 Film contact plate 3a, 4a Spring 5 Packaging film 6 Liquid

Claims (7)

[Claims] 1. A heat seal blade provided on a pair of rolls arranged close to each other and driven to rotate in opposite directions to each other, protruding radially outward, and extending in the roll axis direction. In a heat seal roll that sandwiches and fuses the packaging film between the seal blades, the heat seal blade provided on at least one of the rolls has at least one of a front end portion and a rear end portion in the rotation direction of the roll, and a tip thereof. Protruding from the heat seal blade surface,
A heat-sealing roll comprising a film contacting plate that comes into contact with the packaging film prior to the action of the heat-sealing blade and that is displaced rearward by the surface position of the heat-sealing blade or by the action of the heat-sealing blade. . 2. The heat seal roll according to claim 1, wherein a film contact plate is provided on each heat seal blade of both rolls. 3. The heat seal roll according to claim 1, wherein a film contact plate is provided on each of the heat seal blade on the front side and the rear side in the rotation direction of the roll. 4. The heat seal roll according to claim 1, wherein the film contact plate is capable of moving forward and backward with respect to the surface of the heat seal blade. 5. The heat seal roll according to claim 4, wherein the film contact plate is biased by a spring in a projecting direction. 6. The heat seal roll according to claim 4, further comprising a cylinder for causing the film contact plate to move forward and backward. 7. The heat seal roll according to claim 1, wherein the film contact plate is swingably displaceable with respect to the heat seal blade.