JPH0475951A - Transporting method and transporting device for soft sheet-shaped object - Google Patents

Abstract

PURPOSE:To transport and move a sheet-shaped object at low tension by using a rotary roll formed with fiber sheets made of many fibers and a polymer elastic body impregnated between the fibers, and transporting the sheet-shaped object along its outer periphery surface. CONSTITUTION:Many fiber sheets made of many fibers and a polymer elastic body impregnated between fibers within the range 20-100 wt.% against the fiber weight are wound on a center axis pipe 4 with many suction vent holes on the periphery, or many doughnut disk-shaped fiber sheets are overlapped in the roll axis direction and compressed to form a transport roll 1. Extremely fine fibers with the weaving degree 1.0 denier or below are used to constitute the fiber roll 1. Guide rolls 3 are provided at the front and rear of the transport roll 1, and a sheet-shaped object 2 is transported at relatively low tension along the outer periphery surface of the transport roll 1 within the range of the contact angle with the center angle alpha1 30-260 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for conveying soft sheet-like materials.

In more detail, we use a specially configured roller as a transport roller to transport very soft sheet-like materials such as paper, films, and foils without damaging them. The present invention relates to a novel conveyance method and conveyance device.

[Prior art]

Conventionally, soft sheet-like products, especially sheet-like products such as paper, film, and foil, have been manufactured through various physical and chemical treatments such as impregnation, application, extraction, drying, and heating with treatment liquids. In many cases, the sheet-like material must be conveyed or moved in the form of a sheet.

Conveyance and movement of such a sheet-like material can be carried out by placing the sheet-like material on a net conveyor in -C, or by using transport rolls while nipping it with an appropriate nipping means,
This is often done by holding it with a clip or similar method.

However, although the method using a net conveyor can perform processing with low tension, it may be difficult to process depending on the specific processing conditions, such as when the net is made of a hard material, the object to be processed is soft, or heat is applied. The resulting sheet-like material is prone to scratches and marks, and there are usually limitations on what can be processed.

On the other hand, methods such as using rolls while nipping or gripping with clips may damage the surface of the sheet material due to compression gripping due to the nip of the rolls or the gripping force of the clips, or may cause deformation due to tension. There was an inconvenience that this could happen.

In particular, if the object to be processed is something very soft and weak, such as a very thin film or foil, even if the rolls used are soft, the quality and quality may deteriorate due to wrinkles in the nip of the rolls. Not only that, but there were also many cases where tears occurred, making it impossible to achieve the purpose at all, and causing problems in maintaining production.

Therefore, the conveyance and movement means should be selected as appropriate based on comprehensive judgment from the processing conditions and content, quality, economics, equipment, etc. of the processing of the sheet-like material. In the case of very soft objects such as objects, a conveyance method and a conveyance device that realize stable conveyance and movement with low tension without damaging the surface or gripping part of the conveyed object being gripped. The reality is that this has not yet been seen.

[Problem to be solved by the invention]

In view of the above-mentioned points, an object of the present invention is to prevent the surface portion of the sheet-like object to be gripped even if the object to be processed is a very soft and weak sheet-like object such as film, foil, paper, etc. It is an object of the present invention to provide a novel conveying method and a conveying device for a sheet-like object, which can convey and move a sheet-like object with low tension without damaging the grasped portion.

[Means to solve the problem]

The novel conveyance method and conveyance device for sheet-like objects of the present invention, which achieve the above-mentioned objects, have the following configuration.

That is, the method for conveying a sheet-like object of the present invention uses a rotating roll made of a fibrous sheet made of a large number of fibers and an elastic polymer impregnated between the fibers, and a soft sheet-like object to be conveyed, This is a method for conveying a soft sheet-like material, characterized in that the soft sheet-like material is conveyed while being placed on the outer peripheral surface of the rotating roll.

Further, in the method for conveying a sheet-like article of the present invention,
Preferably, the sheet material to be conveyed is adsorbed onto the outer circumferential surface of the roll by a suction airflow acting from inside the rotating roll, and is conveyed while being attached to the outer peripheral surface of the roll. In the roll, the sheet-like material to be conveyed is placed on the outer peripheral surface of the roll at a central angle of 3
It is characterized by being conveyed while being attached within a contact angle range of 0 degrees or more and 260 degrees or less, or preferably, the fibers are ultrafine synthetic fibers of 1 denier or less. Alternatively, preferably, the fibrous sheet is impregnated with 20 to 100% by weight of the polymeric elastomer based on the weight of the fibers, or alternatively, preferably, the fibrous sheet is a nonwoven fabric sheet. It is characterized by:

In addition, the soft sheet material conveying device of the present invention is composed of a single or multiple rotating rolls made of a fibrous sheet made of a large number of fibers and an elastic polymer impregnated between the fibers. This is a soft sheet-like material conveying device characterized in that the sheet-like material is conveyed while being attached to the outer peripheral surface of the rotating roll.

Alternatively, the soft sheet material conveying device of the present invention includes a rotating roll made of a fibrous sheet made of a large number of fibers and an elastic polymer impregnated between the fibers, and an air flow sucked from inside the roll. It has a suction mechanism that causes
This is a soft sheet-like material conveying device characterized in that the suction airflow is configured to convey a soft sheet-like material while adsorbing it onto the outer circumferential surface of the roll.

[For production]

Hereinafter, the present invention will be explained in more detail based on the drawings and the like.

A feature of the method of the present invention is that a rotating roll made of a fibrous sheet made of a large number of fibers and an elastic polymer impregnated between the fibers is used as a conveying roll, and on the outer peripheral surface of this rotating roll, To convey a soft sheet-like object while being attached to the conveyed object.

FIG. 1 and FIG. 2 are both schematic side views showing a state in which a soft sheet-like material is being transported by the method of transporting a soft sheet-like material of the present invention, and 1.1" is a side view showing a state in which a soft sheet-like material is being transported by the method of transporting a soft sheet-like material of the present invention. It is a rotary conveyance roll made of a fibrous sheet made of an elastic polymer impregnated between the fibers, 2 is a soft sheet-like object to be conveyed, and 3 is a guide roll.

To give a more specific example, the conveyance roll 1
．． 1, for example, is made by wrapping a fibrous sheet made of a large number of fibers and a polymeric elastic material impregnated between the fibers in multiple layers around a central shaft vibrator 4 having a large number of suction ventilation holes on the circumferential surface. It is made by superimposing and compressing a large number of such fibrous sheets into donut disk shapes (disc shapes) in the roll axis direction.

With such a configuration, a suction mechanism is connected to the center pipe to generate a suction airflow on the surface layer of the roll through the fibrous sheet layer, thereby sucking the soft sheet-like material running on the outer peripheral surface of the roll. It can be conveyed along the outer peripheral surface of the roll by adsorption. Such a conveying method using a suction mechanism in combination is suitable for carrying out the present invention in an embodiment in which guide rolls 3 are provided before and after the conveying roll 1 as shown in FIG. This is suitable when it is desired to convey the sheet-like material 2 under tension.

In addition, the embodiment shown in FIG. 2 uses two rotary conveyance rolls 1.1' made of the above-mentioned fibrous sheet, and conveys the sheet-like material by taking a zigzag path with respect to these two rolls. 2
This figure shows an example in which the soft sheet-like material 2 to be conveyed is conveyed while being attached to the outer peripheral surface of the rotary conveyance roll by passing through the rotary conveyance roll. In this case, the sheet-like material can be run along the roll surface by appropriately setting the passage route, so the suction mechanism described in the example of FIG. 1 is not necessarily required. However, this mode is suitable for the case where the conveyance is carried out under a higher tension than in the case of FIG. 1 on the route.

When carrying out the method of the present invention, whether or not a suction mechanism is used together, the fibrous rotating conveyance roll is
A single number or a plurality of numbers may be used. According to the findings of the present inventors, although not particularly limited, in any case, in each individual roll, the contact angle on the outer peripheral surface of the roll is within the range of 30 degrees or more and 260 degrees or less at the central angle. It is preferable that the contact angle be conveyed while the contact angle is in the range of 75 degrees or more and 180 degrees or less at the center angle. Here, the central angles representing the contact angle are α1, α2,
This is the angle indicated by α3. In particular, FIGS. 3 and 4 show examples of transport methods in which the contact angle is small and the contact angle is large.

In addition, a method in which the fibrous rolls are used as a pair of nip rolls and a soft, clean sheet material is moved straight between them without touching the surface of the rolls has a weak conveying force; Since this method requires a separate nip device or the like, this method is not preferred as a transportation method and is not included in the present invention.

In the present invention, the fibers constituting the fibrous roll are preferably synthetic fibers in terms of durability and resistance to sagging,
In particular, ultrafine fibers with a fineness of 1.0 denier or less are preferred, and more preferably 0.5 denier or less.

In other words, the smaller the fineness, the softer and denser the fibrous sheet, which makes the surface of the roll softer to the touch, which not only allows processing without damaging the surface of the sheet to be transported, but also allows the sheet to be transported to be processed more easily. This is more preferable since it is possible to obtain an appropriate frictional force between the material and the material necessary for transportation.

The ultrafine fibers can be obtained by various known methods, such as the seabird type, which allows ultrafine fibers to be obtained relatively easily by removing binding components, applying vibration, etc., and the mixed spinning type. Alternatively, a method using a conjugate fiber that can be made into ultra-fine fibers such as a peelable type is preferably used.

The polymer forming the ultrafine fibers is not particularly limited, but polyester or polyamide is preferably used.

Next, the base of the fibrous sheet is not particularly limited, but it is preferable that the base is a nonwoven fabric, a woven fabric, or a combination thereof.Also, in order to convey the sheet-like material softly, the fiber gaps have a high It is necessary that the molecular elastic material is impregnated. In particular, it is preferable to use a nonwoven fabric in which ultrafine synthetic fibers are entangled three-dimensionally (three-dimensionally) and the interfiber voids are filled with an elastic polymer. In other words, the nonwoven fabrics are intertwined three-dimensionally,
By eliminating the directionality and filling the three-dimensional voids with the polymeric elastic material, the fibrous sheet is given better elasticity and has a moderately soft touch that does not damage the surface of the transported object. This results in a moderate amount of frictional force.

The polymeric elastic material is not particularly limited as long as it imparts elasticity to the fibrous sheet, but polyurethane resins are preferably used from the viewpoint of handling.

The filling ratio of the polymer elastic body is 20-
It is preferably within the range of 100% by weight, more preferably from 30 to 70% by weight. If the filling ratio of the polymeric elastomer is high, the roll formed from the fibers will become hard, making it easier to damage the soft sheet material being transported.
Conversely, if the amount is too low, the surface of the roll formed from the fibrous sheet will be easily damaged, making it unsuitable for long-term use, and both are unfavorable from a practical standpoint.

As a method for obtaining a fibrous sheet consisting of ultrafine fibers and a polymeric elastomer, for example, a woven fabric or a nonwoven fabric is made from the aforementioned composite fibers that can be made into ultrafine fibers, and a solution or dispersion of the ultrafine fibers and the polymeric elastomer is prepared. It can be easily obtained by applying it by a method such as impregnation.

Alternatively, it can be obtained by preparing ultrafine fibers in advance, making them into woven or nonwoven fabrics, and filling them with a polymeric elastic material in an appropriate order.

A roll can be formed by winding a fibrous sheet around a cylindrical shaft as described above, or by stacking a large number of fibrous sheets in the form of a disk, stacking them, and pressing them in the axial direction. .

This roll has a hardness of 25 to 8 as measured in accordance with the JIS-6301 (A code) method.
Preferably, the angle is within a range of 5 degrees.

It is preferable that this roll is provided with a mechanism capable of generating suction airflow by reducing the internal pressure as described above, and the shaft is preferably a hollow cylindrical type with holes provided on the surface.

By using such a roll, it is possible to obtain an appropriate frictional force between the roll surface and the processed sheet material being transported by the internal suction force, and it is possible to realize efficient transport. .

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In this example, the present invention will be specifically explained using a polyethylene film as the object to be treated.
The present invention is not limited to the following examples.

In addition, regarding the evaluation items such as transportability, scratches, and practicality,
It was evaluated using the following method.

(1) Conveyance: According to the embodiments shown in Figures 1 and 2, the conveyance speed is 35 m for each of two types: conveyance in the case of low tension in Figure 1 and conveyance in the case of high tension in Figure 2. The amount of conveyance per minute was evaluated.

In addition, as shown in FIG. 1, the mode of low-tension conveyance by suction was carried out using two guide rolls and one roll was suctioned at a contact angle of center angle αl-60°.

In addition, the mode of high-tension conveyance uses two rolls at 240
A contact angle of 120° (α2 = 120°, α3 = 120°) was carried out.

(2) Scars: The scratches on the film surface were observed and evaluated.

(3) Practicality: Evaluation of practicality was made by repeating continuous 20-minute conveyance evaluation several times and observing and evaluating subsequent changes in the shape of the roll surface.

Example 1 A web was formed with a 3-denier two-component seabird type composite fiber (16 island fibers) consisting of 50% by weight of polyethylene terephthalate as an island component and 50% by weight of polyethylene as a sea component, and a nonwoven fabric was made by needle punching. Ta.

After shrinking the obtained nonwoven fabric, the ultrafine fibers were filled with 50% by weight of polyurethane, and the sea component was removed to obtain a fibrous sheet.

This fibrous sheet was punched out into a disk shape with an outer diameter of 250 mm and an inner diameter of 100 g, a large number of sheets were stacked on a metal shaft with suction holes, and pressed in the axial direction to form a roll. The surface hardness of the obtained roll (according to JIS-6301 method) was 4.
It was 0 degrees.

Using two of these rolls, the polyethylene film was conveyed under high tension in the manner shown in FIG. 2, and the film could be conveyed well without damaging the surface or cleaning it.

Furthermore, when we evaluated the same transportability under low tension using one roll and reducing the pressure in the axial direction with suction of 50 mmHg, the film was transported very well in the manner shown in Figure 1. did it.

The evaluation results are shown in Table 1.

Example 2 A web was formed from 5 denier polyethylene terephthalate, and a nonwoven fabric was made by needle punching.

Polyurethane was added to the obtained non-woven fabric by 50% of the ultrafine fibers.
A fibrous sheet was obtained by filling % by weight.

Evaluations similar to those described in Example 1 were performed using this fibrous sheet.

As a result, we were able to transport the film well, but
Since fibers with a larger fineness than those of Example 1 were used, some slippage was observed at low tension in terms of transportability, and it was judged to be inferior to that of Example 1.

In addition, some of the film was found to have traces from the roll surface, and it was recognized that some care should be taken in selecting the sheet to be transported during use.

The evaluation results are shown in Table 1.

Comparative Example 1 When a polyethylene film was conveyed using a metal roll in the same manner as in Example 1, the film was not damaged, but slippage was observed in all cases, and in terms of conveyance, the polyethylene film was conveyed in the same manner as in Example 1. It was inferior to item 1.2.

The evaluation results are shown in Table 1.

Comparative Example 2 When a polyethylene film was transported using a rubber roll in the same manner as in Example 1, slipping was observed at low tensions and the transportability was poor, and scratches were observed on the surface at high tensions.
Moreover, the film was stretched and was inferior in quality.

The evaluation results are shown in Table 1.

Comparative Example 3 In the embodiment of Comparative Example 2, when the polyethylene film was transported under low tension with a rubber roll on top and nipped, there was no problem in terms of transportability, but wrinkles occurred continuously. A tear was seen in some parts.

The evaluation results are shown in Table 1.

Comparative Example 4 Using a sponge, a roll was formed by overlapping the same cylindrical metal shaft as used in Example 1, and a polyethylene film was transported in the same manner as in Example 1. There were no problems with the quality, such as scratches on the film.

However, it was found that the surface of the roll was damaged during use, making it impractical for practical use.

The evaluation results are shown in Table 1.

(Margins below this page) 4゜ [Effects of the Invention] As described above, the present invention enables the surface or part of the object to be processed when transporting or moving a very soft sheet-like object such as a film or foil. This provides a roll that can be transported and moved with low tension without damaging the material.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic side views each showing an example of a mode in which a soft sheet-like object is conveyed by the method of conveying the soft sheet-like object of the present invention. FIGS. 3 and 4 show examples of transport methods in which the contact angle is particularly small and the contact angle is large.

Claims (1)

[Claims] 1. Using a rotating roll made of a fibrous sheet made of a large number of fibers and an elastic polymer impregnated between the fibers, the soft sheet-like material being conveyed is A method for conveying a soft sheet-like object, characterized by conveying it while being placed on top of the object. 2. The method for conveying a soft sheet-like material according to claim 1, wherein the sheet-like material to be conveyed is adsorbed onto and attached to the outer peripheral surface of the roll by a suction airflow acting from inside the rotating roll. 3. The soft material according to claim 1, wherein the sheet-like material to be conveyed is conveyed in each roll while being attached to the outer peripheral surface of the roll within a contact angle range of 30 degrees or more and 260 degrees or less at a central angle. A method of transporting sheet materials. 4. The method for conveying a soft sheet material according to claim 1, wherein the fibers are ultrafine synthetic fibers of 1 denier or less. 5. The method for conveying a soft sheet material according to claim 1, wherein the fibrous sheet is impregnated with 20 to 100% by weight of the polymeric elastic material based on the weight of the fibers. 6. The method for conveying a soft sheet material according to claim 1, wherein the fibrous sheet is a nonwoven fabric sheet. 7. Consisting of a single or a plurality of rotating rolls made of a fibrous sheet made of a large number of fibers and an elastic polymer impregnated between the fibers, the sheet material to be conveyed is attached onto the outer peripheral surface of the rotating roll. A conveying device for a soft sheet-like material, characterized in that the device is configured to convey the soft sheet-like material while adjusting the material. 8. It has a rotating roll made of a fibrous sheet made of a large number of fibers and an elastic polymer impregnated between the fibers, and a suction mechanism that generates an airflow sucked from inside the roll,
A conveying device for a soft sheet-like material, characterized in that the suction airflow is configured to convey the soft sheet-like material while adsorbing it onto the outer peripheral surface of the roll.