KR102094111B1 - Method for manufacturing a bulk structure using plant fiber pulp and bulk structure manufactured by the same - Google Patents

Abstract

The present invention relates to a method for manufacturing a bulk structure using plant fiber pulp, and a bulk structure manufactured by the same, and more specifically, to a method for manufacturing a bulk structure using plant fiber pulp, in which a surface structure of a structure manufactured through wet forming of a pulp raw material made of plant fibers is bulked up so that porosity is greatly increased and accordingly, buffering and water absorption properties are significantly improved; and a bulk structure manufactured by the same. According to the present invention, the method for manufacturing a bulk structure using plant fiber pulp comprises: a step (a) of preparing plant fiber pulp; a step (b) of forming a sheet-shaped structure by using the plant fiber pulp prepared in the step (a); a step (c) of adjusting moisture of the structure formed in the step (b); and a step (d) of forming pores and protrusions on the moisture-adjusted structure by using a pointed end member having a sharp front end.

Description

Method for manufacturing a bulk structure using plant fiber pulp and a bulk structure produced therefrom {Method for manufacturing a bulk structure using plant fiber pulp and bulk structure manufactured by the same}

The present invention relates to a method of manufacturing a bulk structure using plant fiber pulp and a bulk structure produced thereby, more specifically, by bulking the surface structure of the structure produced through wet molding of a pulp raw material made of plant fibers. The present invention relates to a method for manufacturing a bulk structure using plant fiber pulp, which greatly increases porosity, thereby significantly improving buffering and water absorption properties, and a bulk structure manufactured thereby.

Restricting the use of synthetic resin-based plastic products that can cause serious environmental pollution due to difficulties in recycling and disposal after use worldwide, and actively recommending alternative use of products based on eco-friendly raw materials with excellent biodegradability and recyclability. have.

Accordingly, the demand for various products based on plant fiber pulp, which is excellent in economic efficiency and excellent in eco-friendliness as a natural material, is continuously increasing. For example, pulp molds and various paper products are already widely used from various disposable hygiene products to packaging materials for food and food, and the use and utilization range of the existing synthetic resin-based products has been expanded to be more diverse. .

 As for the disposable hygiene products on the sheet, products such as wipes, diapers, manure pads, women's products, medical disposable sheets, and fresh food rugs are used in various ways in daily life. Recently, the increase in personal furniture and the increase in the use of convenience items, pets As the proportion of the elderly increases rapidly with the increase in the number, the demand and utilization of such disposable hygiene products are growing.

Most of the sheet-like disposable hygiene products are mainly applied to non-woven products manufactured using synthetic resin-based fibers, and in the case of absorbent pad products such as diapers, a combination of synthetic fiber / fluff pulp and non-woven materials is produced. have.

In the case of a non-woven fabric, it is a sheet-like structure having a bulky and high-porosity sheet-like structure, which has excellent economic and productivity characteristics, but physical molding is impossible if the size of the staple fiber as a raw material does not exceed a certain size due to manufacturing characteristics. Since it is mainly made of synthetic fiber as the main raw material, it is difficult to recycle it when it is disposed of, and there is a disadvantage that it may cause environmental pollution due to poor biodegradability.

In addition, in the case of natural fibers having a relatively longer fiber length of several mm or more, such as cotton, hemp fiber, or wool fiber, it is possible to manufacture a non-woven fabric, but it is in a limited situation to be applied for manufacturing disposable products because economic efficiency is greatly reduced.

 On the other hand, in the case of various plant fiber pulp made of wood, bamboo, rice straw, etc., they are pulped and used in large quantities for paper production. In the case of such plant fiber pulp, they have eco-friendly and economical properties, but the fiber length is short. Therefore, there is a disadvantage that it is difficult to manufacture a high-bulk sheet-like structure such as a nonwoven fabric.

Typical high-bulk products manufactured using plant fibers with short fiber length, especially wood pulp, include toilet paper, tissues, napkins, tissues, etc. In order to form a high-bulk structure, wrinkles or wrinkles are used in the manufacturing process. Applying creping technology and embossing technology to form structural irregularities are applied, and various related technologies have been developed to increase the effect of creping or embossing. An example of such a technique is disclosed in documents 1 to 4 below.

Patent Document 1 discloses a tissue that realizes high bulk by performing a creping treatment that wetly manufactures a thin paper having a very low basis weight and gives wrinkles to the paper after drying in order to realize high bulk. have.

Patent Document 2 discloses a tissue product manufactured by applying an embossing process to impart unevenness to a sheet structure by pressing with a roll having a protrusion structure of a certain shape or pattern in order to enhance bulk properties and provide soft properties .

Patent Document 3 discloses a method of manufacturing a bulk tissue while suppressing a decrease in strength by applying crosslinked cellulose fibers to give rigidity together with bulk characteristics. In this manufacturing method, a method of supplementing strength with bulky properties was proposed by applying a crosslinking agent after the creping treatment. Although the methods and techniques for bulk improvement through creping and embossing of low basis weight paper are introduced and utilized, these methods can be applied only to low basis weight paper products, and when the basis weight is high, destruction of the paper structure is very difficult. , It has the disadvantage that it is impossible to apply the creping and embossing process due to its multi-layer structure.

Patent document 4 has the advantage of increasing the flexibility and ease of absorption of the paper if it has an embossed structure, but the elongation is good, but in the case of a thick sheet-like product having a basis weight of a certain level or more, the structure of the surface and the back side is embossed. The work is very difficult, and the deformation by the actual embossing has a disadvantage that it causes a change in the overall shape of the sheet-like product but does not increase the bulk of the sheet-like product itself.

As described above, in the case of disposable absorbent mat products, cushioning packaging materials, and absorbent materials, the prior art should have a structural property capable of absorbing a sufficient amount of solution and supporting a product while having a high basis weight structure of a certain degree or more, It is very difficult to apply the existing creping or embossing method, and there is a problem that it does not bring about improvements in buffering properties and water absorption through bulk improvement of the material itself.

Republic of Korea Patent Registration No. 10-1448416 (2014.09.30. Registration) Republic of Korea Registered Patent Publication No. 10-1063138 (registered on August 31, 2011) Republic of Korea Patent Publication No. 10-2017-0132137 (2017.12.01. Public) Republic of Korea Registered Patent Publication No. 10-1824843 (Registration on January 26, 2018)

The present invention has been devised to solve the problems as described above, and forms a structure by wet molding using eco-friendly plant fiber pulp having excellent biodegradability and recyclability, and a high basis weight structure is layered through physical treatment by an advanced member. By separating and enabling bulking of the surface structure, the method of manufacturing a bulk structure using plant fiber pulp that can be utilized as a material for packaging materials and various sanitary products by strengthening functionalities such as buffering properties and water absorption properties and manufactured thereby The purpose is to provide a bulk structure.

To achieve the above object, a method of manufacturing a bulk structure using plant fiber pulp according to the present invention includes: (a) preparing a plant fiber pulp; (b) forming a sheet-like structure using the plant fiber pulp prepared in step (a); (c) adjusting the moisture of the structure formed in the step (b); And (d) forming voids and protrusions with a pointed tip member in the moisture-controlled structure in step (c).

In addition, the plant fiber pulp is a wood or non-wood based pulp fiber, unbleached coniferous pulp, unbleached broadleaf pulp, bleached coniferous pulp, bleached broadleaf pulp, newspaper paper recycled pulp, white paper recycled pulp, tissue paper and milk pack recycled paper, It is characterized by using at least one selected from non-wood pulp including recycled high-fat ink and bamboo.

In addition, in step (b) to prepare a stock for performing the wet molding of the structure, it is characterized in that it is prepared by releasing the plant fiber pulp to have a concentration of 0.2 to 5% by weight in water.

In addition, in the step (b), wet molding is performed using a paper machine to wet mold a structure so as to have a certain thickness on a mesh, and a fixed thickness using a mold equipped with a mesh net in a mixed stock tank. Characterized in that it is performed by any one of the mold-type wet-molding method to form the wet-molding mold.

In addition, in step (c), the structure molded in step (b) is characterized in that it is dried to contain 40 to 60% by weight of moisture.

In addition, it is characterized in that a plurality of voids and protrusions are formed in the structure by the penetration and separation of the tip members arranged in a plurality in the step (d).

In addition, the insertion angle of the tip member in step (d) is characterized in that 10 ~ 45 degrees.

In addition, in the step (d), it is characterized in that the tip member penetrates to a depth of 20 to 40% from the surface based on the total thickness of the structure.

In addition, in the step (d), the tip member has a diameter of 1 to 3 mm.

In the bulk structure using the plant fiber pulp according to the present invention, after preparing the sheet-shaped structure through wet molding of the pulp made of the plant fiber, the moisture content of the surface of the structure is adjusted to be 40 to 60% by weight, and a number of It is characterized in that a plurality of voids and protrusions are formed between the surface layer and the inner layer by separating the surface layer of the structure from the inner layer using the arranged advanced member.

As described above, the method for manufacturing a bulk structure using the plant fiber pulp according to the present invention and the bulk structure produced thereby are structured with the internal structure and the surface structure of the structure through physical treatment by an advanced member on the wet-molded structure. By partially separating the layers to form constant voids and protrusions between the surface layer and the inner layer, the buffering effect is excellent due to external impact, the water absorption rate is increased, and the water absorption amount by the pores is increased.

In addition, when the bulk structure is manufactured, the surface structure is partially separated to promote the drying inside, thereby increasing the drying efficiency during product production and saving energy, thereby providing an economic effect.

1 is a process diagram showing a method of manufacturing a bulk structure using a plant fiber pulp according to the present invention.
Figure 2 is an exemplary view showing a state of performing a physical treatment on the surface of the structure according to the present invention.
Figure 3 is a graph showing the bulk rising effect of the bulk structure by the advanced member treatment.
Figure 4 is a graph showing the change in drying speed due to the cutting edge member treatment.

Hereinafter, the most preferred embodiment of the present invention will be described in detail in order to explain in detail that a person skilled in the art to which the present invention pertains can easily implement the present invention.

As shown in Figure 1, the method of manufacturing a bulk structure using a plant fiber pulp according to the present invention comprises the steps of preparing a plant fiber pulp; Forming a sheet-like structure using the prepared plant fiber pulp; Adjusting the moisture of the molded structure; And forming a void with a pointed tip member in the moisture-controlled structure.

In the step of preparing the plant fiber pulp, natural plant fiber pulp is prepared based on natural plant fiber pulp for recycling and biodegradable eco-friendly bulk structure that can replace non-woven fabric-based materials made of synthetic fibers.

These plant fiber pulp is a wood or non-wood based pulp fiber, unbleached coniferous pulp, unbleached broadleaf pulp, bleached coniferous pulp, bleached broadleaf pulp, newspaper paper recycled pulp, white paper recycled pulp, tissue and milk pack recycled paper, recycled paper Use at least one selected from non-wood pulp, including deinking pulp and bamboo.

In the step of forming the sheet-shaped structure, a paper material for performing wet molding of the structure is prepared.

That is, the step of forming the sheet-shaped structure is a step of dissolving and stirring the raw material of the plant fiber pulp in water to form a uniform stock, and mixing and blending various plant fiber stocks to match the quality characteristics of the final product.

More specifically, in the step of forming the sheet-like structure, the plant fiber pulp is released to have a concentration of 0.2 to 5% by weight in water to prepare a mixed stock.

In the step of forming the sheet-shaped structure, wet-molding is a paper-type wet-molding method of wet-molding the structure to have a certain thickness on the mesh using a circular mesh or a long-sized paper-making machine, and a mold equipped with a mesh net in a mixed stock tank It is performed by any one of the mold-type wet-molding method to form a wet-molding mold having a constant thickness.

In particular, in the case of a mold-type wet molding method capable of producing products of various structures and shapes, the feedstock is inhaled at a constant suction pressure for a period of time in a mixed stock tank, and the basis weight of the wet-molded body can be adjusted according to the molding conditions. It has an advantage, and is mainly used for manufacturing mold products for packaging because it can form a bulk structure having a higher basis weight than paper-type wet molding.

Products made of plant fiber pulp include paper products such as packaging paper and toilet paper, and pulp mold products such as egg molds, industrial molds, absorbent pads, and absorbent cores for sanitary pads. It is mostly produced by a wet molding method in which the pulp is dissociated in water and molded into a sheet shape on a wire mesh.

Cellulose and hemicellulose, which are the main components of plant fiber, are hydrophilic substances having three or more hydroxyl groups (hydroxy groups) per unit, which are adjacent to the water molecules existing between the hydroxyl group and the hydroxyl group during drying after wet molding. Strong hydroxyl bonds are formed between hydroxyl groups, resulting in the structure and strength of the final product.

In the case of a bulk structure based on plant fibers that are wet-molded due to the properties of these plant fibers, unlike products such as non-woven fabrics manufactured using synthetic fibers, there is an advantage of having excellent strength without entanglement between fibers or application of a binder. .

On the other hand, strong hydrogen bonding between the plant fibers of the wet-molded structure results in a close bond between the plant fibers, resulting in a relatively low porosity and bulk characteristic during drying, thereby reducing buffer and water absorption. Accordingly, in the present invention, a part of the surface layer is physically separated from the inner layer and a certain part of the wet molding process of the eco-friendly plant fiber-based structure to impart high bulk characteristics.

In the step of adjusting the moisture of the structure, it is a step of controlling the moisture contained in the structure for the high bulking treatment of the structure.

The structure to be wet-molded has a moisture content of about 75 to 90% by weight immediately after molding. In this case, the strength of the structure is very weak and the plant fibers are easily separated with no direct hydrogen bonding between the plant fibers. When the drying of the structure proceeds, the drying proceeds from the surface layer, and as the moisture in the inner layer diffuses into the surface layer, the entire structure is dried to finally form a product.

Thus, in the step of adjusting the moisture of the structure, a certain amount of moisture is dried on the surface by controlling the moisture content contained in the wet-molded structure, and hydrogen bonds are generated between the plant fibers present on the surface, which causes the structure to be mutually inactive. By maintaining a constant bonding strength, to prevent the phenomenon of the surface structure, such as in the process of high-tech member penetration for high bulking treatment, and to control the moisture contained in the structure to form an effective surface protrusion.

On the other hand, if the moisture content of the structure is high in the step of adjusting the moisture of the structure, a push may occur in the process of inserting the high-tech member, and when the structure is excessively dried, the moisture content decreases while the high-tech member Penetration becomes difficult, or tearing occurs due to the bonding force between the fibers, resulting in brittleness and fine powder. Accordingly, drying of a part of the surface of the structure through proper drying prevents pushing when the high-tech member penetrates, and the embossing of the surface protrusion where the undried inner layer is separated is appropriately held.

At this time, the structure is dried to contain 40 to 60% by weight of moisture for high bulk treatment by the penetration of the high-tech member, and various methods such as hot air and hot plate can be applied as the drying method.

In particular, when the water content of the structure is 40% by weight or less, hydrogen bonds between the surface layer and the inner layer of the structure are sufficiently generated, and the separation of the surface layer and the inner layer is not easy, and due to strong hydrogen bonding and densification of the surface layer The insertion of the high-tech member is also difficult to achieve the purpose of bulk treatment.

In addition, when the moisture content of the structure is 60% by weight or more, the plant fibers of the surface layer of the structure do not have sufficient hydrogen bonding, and the surface layer is not separated, and the individual fibers are separated, resulting in a shape in which the surface structure is tangled and separated. Due to the high moisture content in the surface layer, sufficient pores are not formed due to recombination with the inner layer during the subsequent product drying process.

As described above, in the present invention, the surface layer forms a certain degree of inter-fiber bonds, and the structure is first dried in a state in which the moisture content is not sufficiently formed between the inner layer and the surface layer, and is about 40 to 60% by weight. It is a high-tech member that separates the surface layer and the inner layer to form a projection.

As shown in FIG. 2, the step of forming voids and protrusions with the tip member in the structure is a step of forming a plurality of voids and protrusions in the structure by infiltration and separation of the tip members arranged in a plurality.

In other words, the pointed tip is penetrated into the moisture-controlled structure to partially separate the surface layer on which the structure is dried to form a surface protrusion (embossing) with a constant size.

The tip member may be applied with a needle, pin, needle, or the like with a sharp tip, and may be replaced with a member that exhibits the same purpose and effect.

Conventionally, the technique of forming an embossing structure, which is used as a method for increasing the buffer and surface absorption of paper products, is a strong pressure on rolls or plates with irregularities of a certain shape and pattern during the drying process of wet-molded products with plant fibers. By pressing to form a concavo-convex shape on the structure of the sheet-shaped structure, it is manufactured in such a way that the thickness direction of the entire sheet coming out is changed by pressing the back portion.

Due to this effect, there is a disadvantage that the density or bulk difference between the convex and concave portions is hardly seen. Accordingly, in the present invention, as the protruding protrusions (embossing) are formed by separating the surface layer structure from the internal structure rather than the embossing method in which the rear portion protrudes forward, the bulk of the actual protruding surface structure itself is improved, and the internal voids are additionally formed. There are advantages.

In the step of forming voids and protrusions with the tip member in the structure, it is preferable that the insertion angle of the tip member is 10 to 45 degrees.

Here, when the insertion angle of the tip member is 10 degrees or less, the workability is poor, and it is difficult to manufacture a uniform projection pattern due to the irregular surface structure of the surface layer.

In addition, when the insertion angle of the tip member is 45 degrees or more, there is a problem that the protrusion structure of the structure is destroyed and the fibers are agglomerated.

In the step of forming voids and protrusions with the tip member in the structure, it is preferable to penetrate the tip member to a depth of 20 to 40% from the surface based on the total thickness of the structure.

That is, when separating the surface layer and the inner layer of the structure using the tip member, the insertion depth of the tip member is penetrated to a depth of 20 to 40% of the total thickness from the surface to perform layer separation to form protrusions on the structure. You can.

The insertion depth of the tip member is somewhat different depending on the basis weight of the actual bulk structure, but when dried to a certain extent, since the drying is performed from the surface, the surface layer and the inner layer are located at a depth of 20 to 40% from the surface. It is easy to perform separation.

Here, when the insertion depth of the tip member is 20% or less, the layer separation of the surface layer of the structure does not occur, and there is a problem that dragging and agglomeration of the individual fibers occur.

In addition, when the insertion depth of the tip member is 40% or more, there is a problem such that excessive separation of the surface layer occurs or the structure itself is destroyed and a hole is formed.

It is preferable that the diameter of the tip member is 1 to 3 mm in the step of forming voids and protrusions with the tip member in the structure.

Here, when the diameter of the tip member is 1 mm or less, it is difficult to insert the tip member into the structure, and even if inserted, the tip member does not have sufficient rigidity so that the surface of the structure is not well separated.

In addition, when the diameter of the tip member is 3 mm or more, there is a problem that the surface structure of the structure is destroyed by the tip member.

On the other hand, when the tip member is separated in the direction opposite to the insertion direction, the structure of the surface layer maintains a projection shape, and the end part descends downward to make a partial contact with the surface layer, and is combined during drying.

Since the surface layer is already partially dried and bonds between fibers are formed, the protrusion structure can be maintained, and most of the bonding state with fibers on the other untreated surface except for the small hole portion where the tip member is inserted. The retained surface layer maintains the protruding structure in which the middle portion protrudes, and maintains the bonding state with the structure.

The protrusion structure formed on the surface of the structure is a high-bulk structure having a void inside the protrusion, and has excellent buffering effect due to external impact, a large specific surface area for absorption of moisture, and a faster surface absorption rate, as well as moisture caused by surface pores The absorption amount is also effective.

On the other hand, when the surface layer of the structure is separated and the protrusion surface structure is completed, the bulk structure is manufactured through an additional drying step. In the case of separating the surface layer, since the surface structure is bulkier than the untreated structure, and the pores are formed, the drying efficiency is improved and the drying energy is reduced as the moisture drying of the inner layer quickly occurs even in the drying process. have.

In the drying step, a non-contact drying method is applied, and drying is performed by applying a near infrared or far infrared dryer using radiant energy, a microwave dryer using a wavelength energy, a high frequency dryer, or a direct heating hot air dryer. When drying, by simultaneously applying radiant energy or heat transfer from the top and bottom surfaces of the structure, drying of the top and bottom surfaces is made the same, thereby minimizing distortion or deformation that may occur due to uneven drying of the bulk structure.

According to the present invention, a bulk structure is manufactured using the method of manufacturing a bulk structure using the plant fiber pulp of the present invention, wherein the bulk structure is manufactured by manufacturing a sheet-like structure through wet molding of pulp made of plant fibers. After that, the water content of the structure surface is adjusted to be 40 to 60% by weight, and the surface layer of the structure is separated from the inner layer by using a plurality of advanced members arranged to form a number of voids and protrusions between the surface layer and the inner layer. It is characterized by.

Hereinafter, the present invention will be described in more detail by examples. However, the following examples are only to illustrate the present invention, the content of the present invention is not limited to the following examples.

Example  1: Bulk structure production

Among the plant fiber pulp, a stock based on a recycled newspaper was prepared, and a sheet-shaped structure sample was prepared using a wet mold molding method. After molding, pre-treatment was performed so that the moisture content was about 60% by weight. Subsequently, the surface of the structure was penetrated by using the advanced member. At this time, the insertion angle of the advanced member was set to 60 degrees, and the insertion depth of the advanced member was respectively 5%, 25%, and 50% of the depth of the structure. Processed to form protrusions on the structure surface. Thereafter, drying was performed in a hot air drying method at a temperature of 160 ° C. to prepare each sample product.

Example  2 : State-of-the-art  Evaluation of bulk structure characteristics according to insertion depth

As shown in Table 1, when the insertion depth of the tip member penetrated to a depth of 5% from the surface based on the total thickness of the structure, the surface layer was not separated and the fibers on the surface were scratched, and the fibers were lifted. When penetrated to a depth of 25% from the surface based on the total thickness of the structure, it was confirmed that the fibers of the surface layer were lifted together, but the insertion angle of the tip member was large, so that no protrusion was formed, and the fibers were agglomerated to form a lump. I could confirm that it created a projection shape. However, when the insertion depth of the high-tech member penetrated more than the inner intermediate layer, that is, more than 50%, it was confirmed that a hole was generated in the structure while the surface layer was not separated and a part of the structure was destroyed. When the high-tech member deeply enters the structure, a phenomenon in which a part is pierced occurs, and a structure structure is destroyed. When the high-tech member was treated on the surface of the structure, the surface was scratched without lifting, and the fiber was torn to the side. However, when the tip member penetrated to a depth of 25%, it was confirmed that protrusions were formed on the surface of the structure.

Changes in the surface structure of the bulk structure according to the insertion depth of the advanced member Surface structure with advanced member penetrated to a depth of 5% of the structure thickness Surface structure with advanced member penetrated to a depth of 25% of the structure thickness Surface structure in which the advanced member penetrates to a depth of 50% of the structure thickness Structure
Surface structure

Structure
Sectional structure

Example  3: State-of-the-art  Evaluation of bulk structure characteristics by insertion angle

The insertion depth of the tip member was maintained at a level of 25% compared to the thickness of the structure, and the insertion angle of the tip member was adjusted to 45 degrees and 60 degrees, respectively, and then the surface structure by the insertion angle was evaluated.

  As shown in Table 2, when the insertion angle of the tip member was 60 degrees, the fibers of the surface layer were separated from the inner layer, but the fibers were agglomerated and agglomerated. When the insertion angle of the tip member was 45 degrees, it was confirmed that the surface layer was separated without agglomeration of the inner layer, and as a result, it was confirmed that protrusions were properly formed on the surface of the structure.

Changes in the surface structure of the bulk structure by the insertion angle of the advanced member Appearance characteristics when the insertion angle of the advanced member is 60 degrees Appearance characteristics when the insertion angle of the advanced member is 45 degrees Expanded structure treated with 45 ° insertion angle Structure
Surface structure

Example  4: According to the moisture content control of the bulk structure High bulk  Comparison of treatment effect

Wet-molding the structure using conifer BKP among plant fiber pulp, and drying it by hot air to make the moisture content 70% by weight. The effect of high bulking treatment according to the moisture content of the structure was evaluated by adjusting to 60% by weight, 50% by weight, 40% by weight, and 30% by weight, respectively. In the case of high bulk treatment, the insertion angle of the cutting-edge member was 45 degrees, and the insertion depth was 25%, and the bulk structure treatment was performed, and then the surface structure characteristics of the fabricated structure were compared and evaluated.

As shown in Table 3, the protrusions are formed on the surface of the structure when the advanced member is processed when the water content is 70% by weight, but when the product is dried, the surface layer does not exist in a separate form and contracts with drying, resulting in a protrusion structure. It was confirmed that it returned to its original state. Thereafter, when the moisture content was 60% by weight, 50% by weight, and 40% by weight, it was confirmed that an appropriate level of protrusion was formed. When the water content of the structure was 30% by weight, drying of the structure was achieved considerably as a whole, and as a result, in the case of the surface layer, a strong hydrogen bond was formed, and thus, the insertion of the high-tech member into the surface layer was poor. Accordingly, it was confirmed that formation of the protruding structure of the structure was very difficult.

For proper high bulking treatment after wet molding of the structure, it was effective to adjust the water content of the structure to 40 to 60% by weight, and when the water content is high, the fiber layer of the separated surface layer returns to its original state. When the moisture content is small due to drying, the fiber of the surface layer is strongly formed, and resistance is generated in the insertion of the high-tech member itself, and some fibers fall off.

Evaluation of surface structure characteristics of bulk structure after high bulk treatment by moisture content of bulk structure Structure
Moisture content (% by weight)
70
60
50
40

30

Structure
Surface structure

Example  5: State-of-the-art  Bulk structure by size Advanced member  Evaluation of treatment characteristics

Among the plant fiber pulp, the structure is formed by wet molding using broad-leaved bleached pulp, the moisture content is adjusted to 50% by weight, and the depth of the advanced member is 25% compared to the thickness, and the insertion angle of the advanced member is high bulked by 30 degrees. Under the conditions, the bulking treatment was performed by varying the diameters of the tip members.

As shown in Table 4, when the diameter of the tip member is 1 mm or less, it is difficult to insert the tip member into the structure, and even when inserted, the tip member does not have sufficient rigidity so that the surface of the structure is not well separated. When the diameter was 4 mm or more, a phenomenon in which the surface structure of the structure was destroyed by the tip member occurred. When the diameter was 2 mm, it was confirmed that the insertion of the tip member and the separation of the surface layer and the protrusion-like surface structure were appropriately performed. For this treatment, it was confirmed that the application of the tip member having a diameter of 1 to 3 mm was desirable. .

Evaluating the effect of high bulking treatment according to the size of the advanced member State-of-the-art
diameter 1 mm 2 mm 4 mm Structure
Surface structure

Example  6: In the state of the art  Evaluation of surface structure of bulk structure

With the insertion angle of the advanced member being 45 degrees and the insertion depth being 25%, the surface structure of the protruding surface structure manufactured by performing surface treatment when the moisture content of the wet-molded structure is 50% by weight with hardwood bleached pulp Comparative evaluation. As shown in Table 5, as a result of comparative evaluation of the cross-section of the untreated product and the processed product, it was confirmed that the protrusion surface structure was formed by the cutting-edge member treatment, and it was confirmed that sufficient voids were formed inside the actual protrusion.

Evaluation of change in surface structure of bulk structure by advanced member Photo Untreated structure cross section

Advanced member processing structure cross section

Example  7: Advanced member  Bulk change of bulk structure by treatment

Bulk bleaching pulp wet-molded structures were subjected to advanced member treatment to evaluate bulk changes of the prepared structures. As shown in FIG. 3, it was confirmed that the bulk property increased by about 35% when treated compared to the structure where the tip member was not treated. Particularly, when the height elevation of the protrusion itself was measured by the protrusion surface structure formed of the high-tech member, it was found that it exhibits a synergistic effect of bulk by additionally thickening about 20-50% compared to the thickness of the entire structure.

Example  8 : Advanced member  Evaluation of the effect of increasing the water absorption of the bulk structure by treatment

The change in water absorption of the structure by treatment with the advanced member was evaluated. The water absorption amount of the structure is 2 × 2 ㎝ after preparing the specimen of the structure, immersed in distilled water, catched for about 1 minute, and then taken out to remove the gravity water. The amount of absorption was evaluated.

The water absorption of the advanced member-treated structure was 642% by weight, and the water absorption of the untreated structure was 610% by weight, and it was confirmed that the water absorption of the structure was increased by bulking of the surface structure by the advanced member treatment.

The moisture absorption amount of the bulk structure was evaluated using the following equation.

Changes in water absorption of bulk structures by advanced member treatment Water absorption (% by weight) Untreated structure 609.9 ± 11.9 Advanced member processing structure 642.0 ± 6.9

Example  9: Advanced member  Drying efficiency change by treatment

The effect of the structural change of the structure by the advanced member treatment on the drying speed of the product was evaluated. In evaluating the change in the drying rate, the amount of water dried from the structure under the temperature condition of 100 ° C. was evaluated as the amount of dried water per second of the drying time, and the results are shown in FIG. 4. It can be seen that the more the amount of water to be dried per second of drying time, the faster the drying rate.

  It was confirmed that the drying speed is increased by about 20 ~ 30% compared to the non-treatment when processing the advanced member. This was considered to affect the increase in drying speed as the structure was separated by protrusions and bulked and drying both inside and outside occurred together.

The dry amount of the bulk structure was evaluated using the following equation. \

Example  10: Advanced member  Bulk structure by processing Bufferability  change

The buffer change of the structure by the advanced member treatment was evaluated. The cushioning property of the structure was evaluated as a very important quality characteristic when applied as a packaging material, and then the structure was placed on the bottom surface of the structure, and then a steel ball of a certain weight was dropped on the structure to measure the height of the bouncing. In this evaluation, the drop height of the steel bead was set to 300 mm, and after dropping the steel bead (15 mm, 16.43 g), it was touched to the bottom surface after the first drop, and the height of rebound and bouncing was measured and shown in Table 7. The lower the height of the steel ball, the higher the cushioning quality.

  In the case of the high-tech member-treated structure, it was confirmed that the height of the bouncing is significantly reduced from the existing 81 cm to 71 cm compared to the untreated sample. This was judged to show a buffering effect as the surface structure was bulked due to the protrusions formed on the structure surface.

Changes in the cushioning characteristics of the bulk structure through the treatment of advanced members Steel ball recoil height (mm) Untreated structure 81.67 ± 0.88 Advanced member processing structure 71.33 ± 0.33

Although the present invention has been described with reference to the accompanying drawings with reference to preferred embodiments, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the invention from these descriptions. Therefore, the scope of the invention should be construed by the claims set forth to cover examples of many of these variations.

Claims (10)

(a) preparing plant fiber pulp;
(b) forming a sheet-like structure using the plant fiber pulp prepared in step (a);
(c) adjusting the moisture of the structure formed in the step (b); And
(d) forming pores and protrusions with a pointed tip member on the moisture-controlled structure in step (c); a method for manufacturing a bulk structure using plant fiber pulp.
The method according to claim 1,
The plant fiber pulp is a wood or non-wood based pulp fiber, unbleached coniferous pulp, unbleached broadleaf pulp, bleached coniferous pulp, bleached broadleaf pulp, newspaper paper recycled pulp, white paper recycled pulp, tissue and milk pack recycled paper, recycled paper Method of manufacturing a bulk structure using a plant fiber pulp, characterized in that using at least one selected from non-wood pulp including deinking pulp and bamboo.
The method according to claim 1,
In the step (b) to prepare a stock for performing wet molding of the structure, the plant fiber pulp is used to release the plant fiber pulp to have a concentration of 0.2 to 5% by weight to produce a mixed stock. Method for manufacturing bulk structure.
The method according to claim 2,
In the step (b), wet molding is a paper-type wet molding method in which a structure is wet-molded to have a certain thickness on a mesh using a paper machine, and wet molding of a constant thickness using a mold equipped with a mesh network in a mixed stock tank. Method of manufacturing a bulk structure using a plant fiber pulp, characterized in that it is carried out in any one of the mold-type wet molding method to form a mold.
The method according to claim 1,
In the step (c), the method of manufacturing a bulk structure using plant fiber pulp is characterized in that the structure formed in step (b) is dried to contain 40 to 60% by weight of moisture.
The method according to claim 1,
A method of manufacturing a bulk structure using plant fiber pulp, characterized in that a plurality of voids and protrusions are formed in the structure by infiltration and separation of the high-tech members arranged in a plurality in the step (d).
The method according to claim 1,
Method of manufacturing a bulk structure using a plant fiber pulp, characterized in that the insertion angle of the tip member in step (d) is 10 to 45 degrees.
The method according to claim 1,
In the step (d), the method for manufacturing a bulk structure using plant fiber pulp, characterized in that the tip member penetrates to a depth of 20 to 40% from the surface based on the total thickness of the structure.
The method according to claim 1,
The method of manufacturing a bulk structure using plant fiber pulp, wherein the diameter of the tip member in step (d) is 1 to 3 mm.
It is manufactured by the manufacturing method of any one of claims 1 to 9,
After preparing a sheet-shaped structure through wet molding of pulp made of plant fibers, the water content of the structure surface is adjusted to be 40 to 60% by weight, and the surface layer of the structure is internally installed using a multi-staged high-tech member. Bulk structure using plant fiber pulp, characterized in that to form a number of voids and protrusions between the surface layer and the inner layer separated from the layer.

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