JP2022057391A - Conveyance device - Google Patents

Abstract

To provide a conveyance device in which films having a sealant layer are laminated so that the sealant layers face each other, and an adhesion prevention nip roll is provided which can avoid a phenomenon that the sealant layers are in close contact with each other and are difficult to peel off due to the nip roll for conveyance.SOLUTION: In a conveyance device in which a laminate having a sealant layer using a plastic film as a base material is stacked and conveyed with the sealant layers facing each other, the conveyance device is provided with a pair of nip rolls, and a conveyance is performed by the rotation of this pair of nip rolls, of these, a surface of at least one of the nip rolls has a convex part that is discontinuous in a circumferential direction and discontinuous in a width direction, and this pair of nip rolls always nip the laminate at any part of the surface during rotation.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transport device. In particular, in a device that stacks films having a sealant layer so that the sealant layers face each other and performs processing such as laminating, the nip roll for transport avoids the phenomenon that the sealant layers are in close contact with each other and difficult to peel off. It relates to a transport device having a contact prevention nip roll which can be used.

For example, a packaging bag can be made from a laminate having a sealant layer using a plastic film as a base material to obtain a packaging bag. In this case, a method is known in which the sealant layers are overlapped with each other so as to face each other, and the sealant layers are sealed to form a bag.

The packaging bag in the example given here is not only composed of a single layer of a plastic film, but also has a layer structure according to the required quality of the contents as a laminate with another plastic film, a resin layer, a metal foil, or the like. One of the features is that it is possible to design materials and materials, and it is widely used for various purposes. In addition, it is often more advantageous than glass bottles and cans in terms of both performance and cost.

Especially recently, there has been a growing movement to stop throwing away plastic and glass bottles. In addition to the cost, from the viewpoint of environmental protection such as the problem of microplastics, there is a remarkable movement to reduce waste by using refill containers.

For example, a liquid packaging bag based on a plastic film and having a sealant layer is flexible and folds flat before filling the contents, takes up less space, and after use. However, it can be folded flat to reduce the volume. It can also be incinerated as waste.

Against the background of such advantages, a packaging bag formed of a laminate having a sealant layer using a plastic film as a base material has been evaluated for its functionality and convenience, and its demand has been particularly increasing in recent years.

However, in a processing process such as bag making, for example, in a bag making process such as a three-way seal bag or a four-way seal bag, the laminate may be conveyed with the sealant layers facing each other, and the laminate may be conveyed. It is generally carried out by sandwiching it between the front and back sides of the nip roll.

At this time, since the stacked laminated bodies are pressed by being sandwiched by the nip rolls, the sealant layers may come into close contact with each other, causing a phenomenon that the sealant layers are difficult to peel off. This is the same regardless of whether the state of the laminated body is roll-to-roll or separated one by one.

Such a state in which the sealant layers of the laminated body are in close contact with each other and are difficult to peel off is one of the causes that hinder the openness of the opening and the filling property of the contents in the case of a packaging bag, for example. ..

Patent Document 1 proposes a method for manufacturing a laminated sheet that can be easily peeled off by a roll having a groove formed around the peripheral surface on the roll surface of a nip roll for web transport, but is not adhered depending on the depth of the groove. It is intended to form a region and a pseudo-adhesive region at the same time, and the purpose is different. In addition, the filling property of the contents was not significantly improved.

Japanese Unexamined Patent Publication No. 9-290452

The present invention has been made in view of such a situation, and in an apparatus in which films having a sealant layer are laminated so that the sealant layers face each other, the sealant layers are brought into close contact with each other by a nip roll for transportation and peeled off. An object of the present invention is to provide a transport device provided with a contact prevention nip roll capable of avoiding a difficult phenomenon.

The invention according to claim 1 is a means for solving the above problems.
In a transport device in which a laminate having a sealant layer using a plastic film as a base material is laminated and conveyed with the sealant layers facing each other.
The transport device is provided with a pair of nip rolls.
The transfer is performed by the rotation of this pair of nip rolls.
Of these, the surface of at least one of the nip rolls has a convex portion that is discontinuous in the circumferential direction and discontinuous in the width direction.
The pair of nip rolls is a transport device, characterized in that the laminate is always niped at any portion of the surface during rotation.

Further, the invention according to claim 2 is based on the invention.
The transport device according to claim 1, wherein the unevenness on the surface of the nip roll is a plurality of irregularities formed by being partially separated in the circumferential direction and the width direction.

Further, the invention according to claim 3 is based on the invention.
The transport device according to claim 1, wherein the unevenness on the surface of the nip roll is irregularly formed in both the circumferential direction and the width direction.

Further, the invention according to claim 4 is the invention.
The transport device according to claim 1, wherein the unevenness on the surface of the nip roll is an unevenness formed in a grid pattern.

Further, the invention according to claim 5 is
The transport device according to any one of claims 1 to 4, wherein the unevenness on the surface of the nip roll is unevenness having a difference in depth of the concave portion with respect to the convex portion of 30 μm or more.

According to the present invention, in a device in which films having a sealant layer are laminated so that the sealant layers face each other, it is possible to avoid a phenomenon in which the sealant layers are in close contact with each other due to a nip roll for transport and are difficult to peel off. It is possible to provide a transport device provided with a contact prevention nip roll that can be used.

That is, the transport device is provided with a pair of nip rolls for transporting the laminated body, and the surface of at least one of the nip rolls is formed with a convex portion which is discontinuous in the circumferential direction and discontinuous in the width direction. By doing so, it is possible to avoid or prevent the phenomenon that the sealant layers are in close contact with each other and difficult to peel off due to the pressurization by the nip roll.

Further, since the pair of nip rolls always nip the laminated body at any part of the surface during rotation, the tension of the laminated body can be stabilized, and more stable transportation becomes possible.

In particular, according to the second aspect of the present invention, the unevenness on the surface of the nip roll is a plurality of unevenness formed by being partially separated in the circumferential direction and the width direction, that is, the unevenness is made plurality. This makes it possible to further level the bias of the nip.

In addition, the pair of nip rolls makes it possible to always nip the laminated body to be conveyed at any part of the surface during rotation, stabilize the tension of the laminated body, and make the transfer more stable. It is possible to do.

In addition, by forming a plurality of irregularities separated in the circumferential direction, pressure due to the nip roll is not applied to the concave portions, which prevents a phenomenon in which continuous peeling is difficult to occur in the flow direction of the web. can do.

In particular, according to the third aspect of the present invention, the unevenness on the surface of the nip roll is irregularly formed in both the circumferential direction and the width direction, so that the generation of tension for transportation is more evenly distributed. It is possible to make something like that.

Therefore, it is possible to prevent stable transport and partial bias of the phenomenon that the sealant layers are in close contact with each other and difficult to peel off, which may occur due to the nip roll, and the sealant layers are in close contact with each other more stably. It is possible to obtain the effect of avoiding the phenomenon of being difficult to peel off.

In particular, according to the invention of claim 4, since the unevenness on the surface of the nip roll is unevenness formed in a grid pattern, it is possible to make the generation of tension for transportation more even and uniform. Is.

Therefore, it is possible to prevent the bias of the phenomenon that the sealant layers are in close contact with each other and difficult to peel off, which may occur due to stable transport and nip roll, and it is more stable and the sealant layers are in close contact with each other and difficult to peel off. The effect of avoiding the phenomenon can be obtained.

In particular, according to the invention of claim 5, it is effective to solve the problem of the present invention that the unevenness of the surface of the nip roll is such that the depth of the concave portion with respect to the convex portion is 30 μm or more.

That is, when the unevenness is 30 μm or more, the pressurized portion and the non-pressurized portion by the nip roll are clear, and the phenomenon that the sealant layers are in close contact with each other and difficult to peel off, which may be generated by the nip roll, should be avoided. It is more effective against.

FIG. 1 is a schematic perspective view for explaining a portion of a nip roll in one embodiment of the transport device according to the present invention.

Hereinafter, a more detailed description of the present invention will be added with reference to the drawings. However, the present invention is not limited to the examples shown here. The present invention is specified by the claims.

FIG. 1 is a schematic perspective view for explaining a portion of a nip roll in one embodiment of the transport device according to the present invention.

The present invention is a transport device for transporting a laminate having a sealant layer using a plastic film as a base material, with the sealant layers facing each other.

The transport is generally performed by sandwiching and transporting a laminated body in which sealant layers are opposed to each other on a pair of rotating nip rolls, for example, in a continuous web shape or in a state of being individually separated. ..

As an example of such a transport device, there is a transport device in which a laminate having a sealant layer using a plastic film as a base material is laminated so that the sealant layers face each other, and the sealant layers are made into a packaging bag and transported. For example, there is a bag-making method in which the sealant layers are stretched together in the longitudinal direction and further sealed with an opening left, or a three-way seal in which three sides are sealed with the opening left.

At this time, since the laminated body is pressed by being sandwiched by the nip roll, the sealant layers may come into close contact with each other, causing a phenomenon that the sealant layers are difficult to peel off. This is the same regardless of whether the state of the laminated body (30) to be conveyed is in the form of a web capable of roll-to-roll or in the state of being individually separated.

The opening is an unsealed part for filling the contents, and is sealed after filling the contents, and the packaging bag is sealed. At that time, the sealant layers of the laminate are in close contact with each other and are difficult to peel off. This is inconvenient for the filling process, and the present invention attempts to solve this problem.

The example shown in FIG. 1 is an example of a web-shaped laminated body (30). That is, it shows a state in which the nipped laminate (30) is conveyed in the direction of the arrow (31).

In the transport device according to the present invention, the surface of at least one of the nip rolls is discontinuous in the circumferential direction and discontinuous in the width direction, and the pair of nip rolls is always on any part of the surface during rotation. It is characterized in that the laminated body (30) to be conveyed is niped.

In the example shown in FIG. 1, of the pair of nip rolls, the surface of the nip roll 1 (10) located on the lower side is flat, and the convex portion (21) is formed on the surface of the nip roll 2 (20) located on the upper side. This is an example of discontinuity in the circumferential direction and discontinuity in the width direction.

The concave portion (22) and the convex portion (21) are due to the relative height difference, and the forming method thereof is not particularly restricted. For example, by forming the convex portion (21), the concave portion (22) can be formed as a portion relatively lower than the convex portion (21). Alternatively, by forming the concave portion (22), the convex portion (21) can be formed as a relatively higher portion.

As described above, since the convex portion (21) is partially formed, the portion pressurized by the nip roll is also partially formed, and the sealant layers are in close contact with each other, which makes it difficult to peel off. It doesn't happen entirely.

That is, the convex portion (21) of the nip roll causes the laminated body (30) to be niped, tension is generated to enable transport, and the concave portion (22) of the nip roll does not pressurize, so that they face each other. It is possible to prevent the sealant layers from adhering to each other.

Therefore, in the transport device provided with such a nip roll according to the present invention, for example, in a device in which films having a sealant layer are stacked so that the sealant layers face each other and laminated, the sealant layers are connected to each other by the nip roll for transport. It is possible to avoid or prevent a phenomenon in which the film is in close contact and is difficult to peel off on the entire surface.

Further, the unevenness on the surface of the nip roll provided in the transport device according to the present invention can be a plurality of unevenness formed by being partially separated in the circumferential direction and the width direction of the nip roll. That is, by making the unevenness a plurality, it becomes possible to further level the bias of the nip.

Further, the pair of nip rolls provided in the transport device according to the present invention can always be in a state of niping the laminated body (30) to be transported at any part of the surface during rotation. Can be performed continuously and more stably.

Further, the unevenness on the surface of the nip roll can be irregularly formed in both the circumferential direction and the width direction.

By randomly forming the unevenness, it is possible to make the generation of tension for transportation more even and uniform, stable transportation, and the sealant layers that may be generated by the nip roll are in close contact with each other. It is possible to prevent the bias of the phenomenon that is difficult to peel off, and it is possible to obtain a more stable effect.

Further, the unevenness on the surface of the nip roll can be unevenness formed in a grid pattern. The grid-like unevenness may be, for example, a checkered pattern, and the irregularities can be arranged in a staggered manner according to the grid pattern. Alternatively, a grid shape such as a houndstooth may be used.

In the process of diligently studying the present invention, the problem of the present invention is that the unevenness of the surface of the nip roll is such that the difference in depth of the concave portion (22) from the convex portion (21) is 30 μm or more. Found to be more effective.

That is, when the difference in the depth of the concave portion (22) with respect to the convex portion (21) is unevenness of 30 μm or more, the pressurized portion and the non-pressurized portion by the nip roll are clear, and the sealant layers are formed by the nip roll. It is more effective in avoiding the phenomenon that the pressure is adhered and difficult to peel off.

The nip roll does not impose any particular restrictions on its material or overall form, and generally, a nip roll having a rubber material layer provided on the outside of a roll core such as metal or FRP is used.

As the rubber material, for example, in addition to natural rubber, nitrile rubber, silicon rubber, fluororubber, urethane rubber and the like are used, and they can be appropriately selected and used depending on the material of the laminate and the processing purpose of the transport device.

As described above, the method of forming the unevenness on the surface of the nip roll is not particularly limited, and for example, there is also a method of scraping off the portion to be the concave portion (22) on the surface of the rubber roll using a rotary blade or a laser. It is also possible to chemically remove it to form a recess (22).

Alternatively, in order to form the convex portion (21), for example, a method of attaching a rubber sheet, a plastic sheet, or the like can be appropriately selected and used.

Further, here, the material constituting the laminated body (30) processed by the transport device according to the present invention will be described.

The plastic film is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), Polyethylene or the like can be used and is appropriately selected according to the application.

In particular, when polypropylene or polyethylene terephthalate is used as a plastic film, it is more preferable in terms of film strength and price. In addition, when a stretched polyamide film is used, it is possible to impart toughness against piercing and impact resistance to the laminated body.

Further, the plastic film can be laminated with another layer via an adhesive layer to form a laminated body. The layer structure of the laminate, the material structure thereof, the thickness, and the like can be appropriately designed according to the desired quality of the packaging bag, for example.

The sealant layer is formed by stacking two laminated bodies so that the sealant layers face each other and adhering them to each other by heating, pressurizing and heat-sealing. For example, in the case of a packaging bag, the sealant layer is manufactured in that form. Enables.

Of the thermoplastic resins, polyolefin resins are generally used as the material of the sealant layer, and specifically, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), and linear low density polyethylene resin. (LLDPE), etc. can be used.

In addition, ethylene-based resins such as ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-methacrylic acid resin copolymer, polyethylene-polybutene blend resin, and homopolypropylene resin (PP). ), Polypropylene-ethylene random copolymer, propylene-ethylene block copolymer, polypropylene-α-olefin copolymer and other polypropylene-based resins can also be used.

To form the sealant layer, a molten resin can be formed by using an extruder or the like to form a layer on the laminate. Alternatively, it is also possible to form a sealant layer on the surface of the laminated body by laminating a material that has been formed into a film state in advance by laminating.

In this way, according to the present invention, in a device for stacking and laminating films having a sealant layer so that the sealant layers face each other, the sealant layers are in close contact with each other by a nip roll for transport and are difficult to peel off. It is possible to provide a transport device provided with a contact prevention nip roll that can prevent the occurrence of a problem.

10 ... Nip roll 1
20 ... Nip roll 2
21 ... Convex part 22 ... Concave part 30 ... Laminated body 31 ... Arrow

Claims (5)

In a transport device in which a laminate having a sealant layer using a plastic film as a base material is laminated and conveyed with the sealant layers facing each other.
The transport device is provided with a pair of nip rolls.
The transfer is performed by the rotation of this pair of nip rolls.
Of these, the surface of at least one of the nip rolls has a convex portion that is discontinuous in the circumferential direction and discontinuous in the width direction.
The pair of nip rolls is a transport device, characterized in that the laminate is always niped at any part of the surface during rotation. The transport device according to claim 1, wherein the unevenness on the surface of the nip roll is a plurality of unevenness formed by being partially separated in the circumferential direction and the width direction. The transport device according to claim 1, wherein the unevenness on the surface of the nip roll is irregularly formed in both the circumferential direction and the width direction. The transport device according to claim 1, wherein the unevenness on the surface of the nip roll is an unevenness formed in a grid pattern. The transport device according to any one of claims 1 to 4, wherein the unevenness on the surface of the nip roll is unevenness having a difference in depth of the concave portion with respect to the convex portion of 30 μm or more.

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