JP2000336575A - Production of impregnated material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate problems of disadvantages in that a varnish is not efficiently impregnated because a vibrator and a fibrous structure are separated in a conventional technique and further disadvantages in that the equipment cost is increased in proportion to the number of ultrasonic vibrators when increasing the number thereof. SOLUTION: This method comprises a primary impregnating step of impregnating or coating a fibrous structure with an excessive amount of an impregnant and a secondary impregnating step of subsequently bringing the primarily impregnated material obtained in the primary impregnating step into contact with a scraper equipped with an ultrasonic vibrating mechanism, thereby further diffusing the impregnant into the interior of the fibrous structure and simultaneously discharging the excessive impregnant on the surface of the fibrous structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to food and beverage products such as a paper box for snacks, a multi-packed outer paper box for collecting and packaging individually packaged products such as seasonings and canned beers, and small household electrical appliances. Packaging materials such as exterior paper boxes, paper boxes for powder compact detergent containers, building materials such as wallpaper, and fiber structures made of paper, nonwoven fabric, and other composite materials used as industrial materials are impregnated with functional materials. The present invention relates to a method for producing an impregnated material such as a fiber structure.

[0002]

2. Description of the Related Art In recent years, environmental problems have become more serious, and containers and packaging materials have to be easily disposed of, and the demand for containers and packaging materials using recyclable materials or easy incineration has increased. Therefore, the increase of waste is a major social problem. There is a great social demand for the reduction and recycling of garbage, and in the packaging container market, instead of metal cans, glass bottles, plastic bottles, and wooden boxes, paper that can be lightly incinerated and recycled as recycled paper In many cases, a container mainly composed of is used.

[0003] Compared with plastic containers and metal containers, paper containers have lower strength of the paper material itself and are more easily deformed. Therefore, when used in a heavy-weight packaging container or in an environment where a large pressure or load is applied, the required container strength may not be able to be maintained satisfactorily. However, as a paper container excellent in easy disposability and recyclability, as the application field expands, higher strength physical properties and physical properties close to those of metal materials and plastic materials are required.

Conventionally, when considering the packaging design of a paper container which is a fiber structure, for example, a method of improving the strength as an example of the function of the paper as the base paper of the packaging material is as follows. Focusing on pulp fiber, which is one of the methods, a method of using base paper having a large basis weight of paper and having a large paper thickness, for example. (2) A method using virgin pulp having a large pulp fiber length or a pulp fiber raw material having a large fiber length, focusing on the components of the paper. (3) A method of laminating a polymer such as a polyethylene resin on the surface. (4) A method of forming a coat layer, an impregnated layer, and the like on the surface of the paper made by coating or the like. (5) A method for improving the strength of paper by adding a chemical containing a functional substance as a main component for improving the strength of the paper in the papermaking process and fixing the chemical to pulp. Etc. are widely and generally performed.

[0005] Base paper to be used for packaging materials and the like in order to cope with environmental problems and resource saving, in order to minimize the amount of pulp fiber used within the range of satisfying required physical properties, use pulp fiber. Virgin pulp having a large length is selectively used, and base paper made from recycled pulp obtained by recycling waste paper has a large basis weight. In the case of base paper using recycled pulp, base paper to which a functional agent having a certain function is added at the paper making stage is made in order to compensate for various physical properties such as inevitably reduced strength.

[0006] The use of recycled paper pulp provides functionalities to the paper in order to compensate for the lost physical properties of the paper itself, such as, for example, strength and water resistance, or to provide additional functionality to virgin pulp based paper. Conventionally, a method of impregnating a drug has been performed, and an impregnation method of adding a drug at a paper making stage is generally used. Therefore, it is not easy to make a base paper having a specific function in order to give the required function to the final form of packaging containers etc. . Therefore, paper having a specific function corresponding to a small lot was not produced.

[0007] Therefore, the production of base paper having a specific specification requires mass production in view of the general paper production process, and the increase in production cost is suppressed by mass production. is the current situation.
In the conventional impregnation process at the papermaking stage, it is not easy to produce a functional impregnated paper in a small lot, so that an impregnated paper corresponding to each required function has not been produced. Therefore, in order to suppress the production cost by mass production, there are not a few cases where base paper provided with unnecessary functions is made and used. That is, an increase in material cost and an increase in production cost due to the requirement for performance that is closer to and / or corresponding to the production of small lots have been a problem that occurs even at the papermaking stage.

The functions required of the paper include strength and water repellency. For example, as a method of supplementing the strength of the paper, a polymer such as polyethylene is laminated on the surface layer, or a hard resin is applied to the surface layer. Methods of impregnating coatings or surface layers have been used. As a method for imparting water repellency, an impregnation method in which rosin or a substance exhibiting water repellency is coated on the surface layer of paper or impregnated into the surface layer has been used. In other words, the conventional impregnation method for modifying the formed paper later to give the required function is only a modification technique that acts on the surface layer of the paper and a layer near the surface layer.

As a method of introducing the impregnating agent deeper into the interior of the fibrous structure, studies have been made on, for example, lowering the liquid viscosity or adding a high boiling point solvent having a good leveling property, depending on the physical properties of the impregnating agent itself.

As an approach from the impregnation processing method, a method of controlling the time during which the fiber structure is immersed in the impregnation tank has been widely and generally used. There has been proposed a method of impregnating a fibrous structure by ultrasonic vibration in which the impregnation property is relatively insensitive.

Therefore, a method of providing an ultrasonic transmitter in the impregnation tank and allowing the impregnating agent to permeate into the fiber structure in a shorter time has been performed. It is known that a conventional ultrasonic oscillation device is attached to an impregnation tank (for example, Japanese Patent Application Laid-Open No. 60-190430, Japanese Patent Application Laid-Open No. 5-318479). Ultrasonic vibration is attached to the impregnating agent in the tank by attaching an ultrasonic vibrator, and at the same time, the fibrous structure passing a certain distance through the impregnating agent is vibrated, and the impregnating agent is impregnated by the vibration of the fibrous structure and the impregnating agent. It is intended to promote the impregnation of the fibrous structure with the agent.

These have the drawback that the varnish is not efficiently impregnated because the vibrator and the fiber structure are separated from each other, and it is necessary to increase the number of ultrasonic vibrators. If the number of ultrasonic oscillators is increased in proportion to this, there is a disadvantage that the equipment cost becomes very large.

Further, there is a method in which an ultrasonic transmitter is brought into contact with a fibrous structure once immersed in an impregnation tank, and the impregnating agent permeates into the fibrous structure in a shorter time. It is known that a conventional ultrasonic oscillator is attached after the impregnation step (for example, Japanese Patent Application Laid-Open No. 10-36531).
In these, the fiber structure containing the impregnating agent is brought into direct contact with an ultrasonic vibrator to vibrate the fiber structure via the impregnating agent, and the impregnating agent is impregnated into the fiber structure by the vibration of the fiber structure and the impregnating agent. Although it is to be promoted, it is necessary to measure the impregnating agent. If the impregnating agent is not weighed,
It is hard to say that the impregnating agent partially emerges on the surface of the fibrous structure due to the ultrasonic vibration, forms a cured film with the impregnating agent, and can be uniformly impregnated.

[0014]

DISCLOSURE OF THE INVENTION The present invention has been made as a result of intensive studies by the inventors with a view to solving the above-mentioned problems, and has been made of fibers made of paper, nonwoven fabric and other composite materials. In a method for producing an impregnated material in which a structure is impregnated with an impregnating agent, a primary impregnating step of impregnating or coating the fibrous structure with an excessive amount of an impregnating agent, and then superimposing the primary impregnated material obtained in the primary impregnating step on the fibrous structure. By the secondary impregnation step of contacting the scraper with the ultrasonic vibration mechanism,
Furthermore, at the same time as the impregnating agent diffuses inside the fiber structure,
By discharging the excess impregnating agent on the surface of the fibrous structure and the secondary impregnating step of contacting a Meyer bar equipped with an ultrasonic vibration mechanism, the impregnating agent is further diffused into the fibrous structure, and at the same time, the amount of impregnation is measured. The method for producing an impregnated material is characterized by further impregnating the impregnating agent capable of exhibiting the intended function even more effectively even inside the impregnated material, thereby minimizing material cost and production cost increase. It is an object of the present invention to provide a method for producing an impregnated material in which the material is most efficiently impregnated and modified.

[0015]

Means for Solving the Problems A first invention of the present invention is:
In a method for producing an impregnated material in which an impregnating agent is impregnated into a fibrous structure made of paper, nonwoven fabric, and other composite materials, a primary impregnation step of impregnating or coating the fibrous structure with an excessive amount of an impregnating agent, The secondary impregnation step, in which a scraper equipped with an ultrasonic vibration mechanism is brought into contact with the primary impregnation obtained in the impregnation step, further diffuses the impregnating agent into the interior of the fibrous structure and simultaneously discharges the surplus impregnating agent on the surface of the fibrous structure. A method for producing an impregnated material.

According to a second aspect of the present invention, there is provided a method for producing an impregnated material for impregnating an impregnating agent into a fibrous structure made of paper, nonwoven fabric, other composite materials, or the like, wherein the fibrous structure is impregnated with an excessive amount of the impregnating agent. Alternatively, the primary impregnation step of coating, and then the secondary impregnation step of contacting a Meyer bar equipped with an ultrasonic vibration mechanism to the primary impregnation obtained by the primary impregnation step, further diffusing the impregnating agent into the interior of the fibrous structure At the same time, a method for producing an impregnated material characterized by measuring an impregnation amount.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on one embodiment.

According to a first aspect of the present invention, there is provided a method for producing an impregnated material comprising impregnating an impregnating agent into a fibrous structure made of paper, nonwoven fabric and other composite materials. When the primary impregnation step of impregnating or coating and the secondary impregnation step of contacting a scraper equipped with an ultrasonic vibration mechanism to the primary impregnation obtained by the primary impregnation step, the impregnating agent is further diffused into the fiber structure. At the same time, a method for producing an impregnated material characterized by discharging an excess impregnating agent on the surface of the fiber structure.

In the method for producing an impregnated material of the present invention, first, as a first step, a primary impregnation for impregnating or coating a fiber structure with an impregnating agent capable of exhibiting a desired function is performed. The method of the primary impregnation step of supplying the impregnating agent to the fiber structure depends on the used fiber structure and the impregnating agent, but the fiber structure can be temporarily immersed in the impregnating agent and an excess amount of the impregnating agent can be applied. Dipping method, preferably, there is a gravure coating method or roll coating method of applying or impregnating the impregnating agent by a certain amount, but any method can be selected as long as the impregnating agent can be supplied to the fiber structure. it can.

Following the primary impregnation step, as a second step, a secondary impregnation step of bringing a scraper equipped with an ultrasonic vibration mechanism into contact with the primary impregnated material having the impregnating agent in the surface layer or near the surface layer in the primary impregnation step is further performed. The method is characterized in that the impregnating agent is diffused into the interior of the fiber structure, and at the same time, the surplus impregnating agent on the surface of the fiber structure is discharged. By applying ultrasonic vibration to the primary impregnated material, for example, if the fibrous structure is paper or paperboard, the pulp fiber itself constituting the fiber structure further absorbs the impregnating agent, and temporarily enters the gap between the fibers. Is absorbed by the fibers inside the secondary impregnation stage by ultrasonic vibration.

As a result, it becomes possible to impregnate the inside more efficiently with the impregnating agent capable of exhibiting the desired function. For example, in the case of paperboard used for packaging materials such as confectionery boxes, the impregnating agent can be diffused to almost the entire layer area. Further, since the impregnating agent in the vicinity of the surface layer of the fiber structure is diffused by the ultrasonic vibration, it is possible to obtain an impregnated material in which the impregnating agent is spread almost uniformly to the inside of the fiber structure.

Further, since the impregnating agent floating on the surface can be removed at the same time as the secondary impregnating treatment by ultrasonic waves by a scraper serving as an ultrasonic vibrator, the surplus impregnating agent by using ultrasonic waves forms a layer on the surface of the fiber structure. Never do.

Further, by performing the secondary impregnation treatment using ultrasonic waves, the impregnating agent in the vicinity of the surface layer can be quickly diffused into the interior of the fibrous structure, and the amount of the impregnating agent used can be reduced. This is a method of causing a functional agent to act on a fibrous structure.

When a fibrous structure having a relatively large thickness or a fibrous structure hardly penetrated by an impregnating agent is used, primary impregnation from both sides of the fibrous structure is more efficient. The target impregnating agent can be disposed over the entire area in the thickness direction of the substrate.

Alternatively, in the case of a paper material such as a coated ball in which one surface of a paper is treated with a clay coat or the like, the impregnating process is performed from the other surface that has not been subjected to the treatment, so that the inside of the fibrous structure is formed. Since the impregnating agent can be diffused, even the material having one surface treated, such as the above-described coated ball, can be impregnated efficiently into the interior of the fiber structure by using the impregnating method of the present invention. The agent can be applied as a post-processing after the paper is made, whereby the impregnating agent capable of expressing the desired function can be disposed on all layers of the paper, and the entire layer of paper is modified. It became possible.

Furthermore, since the impregnation method of the present invention can be used as post-processing after papermaking, a general grade paper material can be used as a base material. By performing the impregnation treatment of the present invention, it becomes possible to impart physical properties according to the purpose by impregnation processing, and it is easy to produce only a necessary small amount of functionally modified paper with greatly reduced production cost. became.

As the fibrous structure used in the method for producing an impregnated material of the present invention, paper is often used, and paperboard such as balls and kraft or recycled paper is mainly used and kraft paper is disposed on the surface layer. As the paperboard, a thick paperboard having a thickness of 300 μm or more is preferably used. It is also possible to use either paper made of 100% virgin pulp, recycled paper made from waste paper, or base paper made by laminating these papers in the paper making process. is there. In the method for producing an impregnated material according to the present invention, the fiber structure constituting the impregnated material is not limited to a material and a structure.

As the impregnating agent, acryl, acrylate, acrylonitrile, a copolymer of styrene and butadiene, and a polysilane compound are preferably used. In the method for producing an impregnated material of the present invention, the material and composition of the impregnating agent disposed in the impregnated material are not limited.

The impregnated material produced by the conventional production method in which the surface layer and the vicinity of the surface layer of the fibrous structure are modified with a chemical, exhibits functions such as the strength and water repellency of the surface layer to which the impregnated chemical acts. , Their function remains in the modified part of the paper surface. However, in the method for producing an impregnated material of the present invention, by impregnating and diffusing the impregnating agent into the interior of the fibrous structure, the function of the impregnating agent itself can be widely exhibited in the thickness direction of the impregnated material. Further, the function of the impregnating agent can be imparted to the entire region of the fiber structure such as paper in the thickness direction, and a necessary and sufficient functional impregnated material can be obtained.

According to a second aspect of the present invention, there is provided a method for producing an impregnated material comprising impregnating an impregnating agent into a fibrous structure made of paper, nonwoven fabric and other composite materials. The primary impregnation step of impregnation or coating, and the secondary impregnation step of contacting the primary impregnant obtained by the primary impregnation step with a Meyer bar equipped with an ultrasonic vibration mechanism further diffuses the impregnating agent into the interior of the fibrous structure. At the same time as measuring the amount of impregnation.

Some of the fibrous structure materials, such as thick paper, are relatively impervious to the impregnating agent. However, the secondary impregnation step in which a Meyer bar equipped with an ultrasonic vibration mechanism is in contact with the fibrous structure material further impregnates the inside of the fibrous structure. At the same time as diffusing the impregnating agent, by measuring the amount of impregnation on the surface of the fiber structure, the fiber structure can be more efficiently used in combination with the scraper provided with the ultrasonic generator according to claim 1. The impregnating agent can be introduced into the object, and the amount of the impregnating agent used can be reduced.

Hereinafter, embodiments of the present invention will be described specifically.

<Example 1> As a fibrous structure, a manila ball made of virgin pulp as a raw material and having a clay coat layer on one surface (surface) was used. The basis weight is 505 g / m ² and the thickness is about 0.7 mm.
A solution of an acrylic resin solution using ethyl acetate as a solvent was used as the impregnating agent. An excessive amount of the impregnating agent was primarily impregnated from the non-clay-coated side (back side) of the base paper by a coating method. Next, an ultrasonic scraper was brought into contact with the above-mentioned primary impregnated material, and secondary impregnation for diffusing the impregnating agent was performed. The impregnating agent impregnated from the side of the base paper opposite the clay coating surface was diffused to the vicinity of the clay coat layer, and the impregnating agent was spread on all layers of the paper. The obtained impregnated paper also has a water repellent effect due to the acrylic resin on the paper end face.

<Comparative Example 1> The same fiber structure and impregnating agent as in Example 1 were used. Example 1 from the non-clay-coated side (back side) of the base paper by the coating method
The same impregnation treatment was performed. In the obtained impregnated paper, a water-repellent effect by the acrylic resin was recognized near the paper surface, but no water-repellent effect was recognized on the paper end surface. Further, a coating film of an acrylic resin was formed on the surface to impair the texture of the paper.

[0035]

According to the method of the present invention for producing an impregnated material, the function of the impregnated drug itself is widely exhibited in the thickness direction of the impregnated material by impregnating and diffusing the impregnating agent into the interior of the fibrous structure. It became possible. Furthermore, the function of the impregnating agent could be imparted to the entire area of the fiber structure such as paper in the thickness direction, and a necessary and sufficient functional impregnated material could be obtained. That is, as is clear from the comparison between Example 1 and Comparative Example 1, only the required amount of the impregnating agent can be supplied to the fibrous structure, and the amount of the impregnating agent used can be reduced without being wasted. Thus, it became possible to make the functional drug act on the fiber structure.

Claims (2)

[Claims] 1. A method for producing an impregnated material for impregnating a fibrous structure made of paper, nonwoven fabric and other composite materials with an impregnating agent, wherein the fibrous structure is impregnated or coated with an excessive amount of an impregnating agent. And a secondary impregnation step in which a scraper equipped with an ultrasonic vibration mechanism is brought into contact with the primary impregnated material obtained in the primary impregnation step, thereby further diffusing the impregnating agent into the interior of the fibrous structure and, at the same time, surplus of the surface of the fibrous structure A method for producing an impregnated material, comprising discharging an impregnating agent. 2. A method for producing an impregnated material comprising impregnating an impregnating agent into a fibrous structure made of paper, non-woven fabric and other composite materials, etc., wherein the fibrous structure is impregnated or coated with an excessive amount of an impregnating agent. And, by the secondary impregnation step in which a Meyer bar equipped with an ultrasonic vibration mechanism is brought into contact with the primary impregnant obtained in the primary impregnation step, the impregnating agent is further diffused into the interior of the fibrous structure, and the impregnation amount is measured. A method for producing an impregnated material, comprising: