KR20160132740A - A pulp fiber composition - Google Patents

Abstract

The present invention relates to a pulp fiber composition which can be sufficiently disposed in toilet systems. The composition comprises Acacia mangium fibers and Acacia crassicarpa fibers.

Description

Pulp fiber composition {A PULP FIBER COMPOSITION}

The present invention generally relates to pulp fiber compositions. The present invention also relates to a method of producing a tissue sheet as well as a paper sheet formed from said pulp fiber composition.

Pulp is a common raw material used in the production of tissues such as toilet tissue, paper towels, napkins and other absorbent / sanitary products. Typically, tissue paper is comprised of between 50% and 90% hardwood pulp and between 10% and 50% softwood pulp, depending on the tissue grade. When the tissue paper is made, the specific properties of the pulp material are associated with the desired properties in the resulting tissue, such as flexibility, smoothness, form, opacity, color, and the like. Also, runnability and efficiency during manufacture are important. Thus, the major cost drivers for tissue manufacturing are pulp (light wood and soft wood), chemicals and utilities (electricity, energy, water, etc.).

Acacia pulp provides better flexibility for the tissue due to its fiber properties. This can be attributed to higher fiber populations (number of fibers at a given weight), higher fiber collapse index compared to eucalyptus and other light wood pulps. Acacia also has a lower water retention value (WRV), which results in less water or energy that is required to evaporate water in the Yankee dryer to reach the desired degree of drying .

In addition, the initial strength of the acacia pulp is higher than in the case of eucalyptus and other hardwood pulps. By having higher initial strength, fiber scouring can be minimized in acceptable strength properties to bring about superior bulkiness and flexibility. By lowering fiber refinement, electrical demands can be lowered accordingly, resulting in lower production costs. Another way to improve strength, if needed, is to add expensive fibers such as soft wood. Therefore, the higher initial strength of the acacia fibers results in potentially reducing the use of softwood.

However, despite the aforementioned advantages of using acacia pulp, the acacia pulp has low adhesion (floatability) on the Yankee dryer. This problem can result in poor machine durability and mechanical efficiency, resulting in poor quality tissue due to poor creping from the Yankee dryer. Therefore, for high speed paper machines, the amount of acacia used should be limited and conventionally set at 35%. Increasing the amount of acacia pulp to 35% or more can generally cause durability and quality problems as described above. To improve adhesion to the Yankee dryer, special adhesive chemicals are added to the surface of the Yankee dryer, or treated with acacia pulp prior to use in tissue manufacturing facilities. However, these additional chemicals / treatments are undesirable in terms of economy and efficiency.

There is a need to provide pulp fiber compositions that can overcome or at least ameliorate one or more of the above-mentioned disadvantages.

There is also a need to provide a method of producing a printing paper that can overcome or at least ameliorate one or more of the above-mentioned disadvantages.

According to a first aspect, there is provided a pulp fiber composition comprising acacia mangium fibers and acacia crassicarpa fibers.

Advantageously, the pulp fiber composition may consist of 100% of acacia species with a low lipophilic content in the pulp fiber composition. The pulp fiber composition may not require pretreatment or enzymatic treatment to reduce the lipophilic content in the pulp fiber composition.

The pulp fiber composition may have good adhesion to the Yankee dryer surface without the need for special adhesive chemicals.

The pulp fiber composition may have high fiber collapsibility, thus resulting in a reduced free water content in the pulp fiber composition. This may result in reducing the amount of drying energy required in the Yankee dryer.

According to a second aspect, there is provided a method of producing a printing paper comprising drying a pulp fiber composition comprising acacia mucilage fibers and acacia crisscaraxa fibers to form a dried paper sheet. The method may optionally exclude the step of pretreating the pulp fiber composition or may exclude the addition of adhesive chemicals or enzymes in an excessive amount to the pulp fiber composition.

According to a third aspect, there is provided a tissue sheet formed from a pulp fiber composition comprising acacia mucilages and acacia crasscarf fibers having a tissue bulk property of at least 13 cm 3 / g. do.

Advantageously, the tissue paper can be sufficiently discarded in toilet systems and meet or exceed consumer expectations in tissue flexibility, tissue opacity and tissue strength.

The accompanying drawings illustrate the disclosed embodiments and are intended to illustrate the principles of the disclosed embodiments. It is to be understood, however, that the drawings are designed solely for the purpose of illustration and are not to be construed as limitations of the invention.
Figure 1 is a bar graph showing the fiber structure and disintegration indexes of various pulp mixtures after laboratory pulping.
2 is a bar graph showing the components of the extracted lipophilic material in Acacia moss and Acacia crassicarum wood.
Figure 3 is a bar graph showing fatty acid components in acacia moss and acacia crassicar wood.
Figure 4 is a bar graph showing fatty alcohol components in acacia moss and acacia crassicar wood.
5 is a graph showing the relationship between the melting point of fatty alcohol and the carbon chain length.
Figure 6 is a graph showing the adhesion to a Yankee dryer as a function of acacia lipophilic content. These graphs also indicate the amount of adhesive chemistry used in the Yankee dryer to increase the adhesion of the pulp on the Yankee surface.
Figure 7 is a bar graph showing lipophilic content as a function of increasing amounts of acacia crassicarra in pulp mixtures by laboratory pulping.
Figure 8 is a bar graph showing lipophilic content as a function of increasing amounts of acacia crassicarra in pulp mixtures after mill pulping.
Figure 9 is a bar graph showing the adhesion of Acacia XP to Yankee dryers compared to other pulps.
Figure 10 is a bar graph showing the dryness of the Acacia XP before the Yankee compared to other pulps.
Figure 11 is a bar graph showing tensile indices, refining energy and tensile at 25 ° SR of Acacia XP compared to other pulps.
Figure 12 is a bar graph showing tissue tensile strength indices and tissue bulk values of Acacia XP compared to tissues made from other pulps with similar gsm.
Figure 13 is a bar graph showing tissue flexibility and opacity qualities of Acacia XP compared to tissue made from other pulps with similar gsm.

Definitions

The following words and terms have the meanings indicated below.

The term " lipophilic components " refers to waxes, fatty acids, alkanols (such as pewter and / or long chains of OH, such as C ₂₄ -C ₂₈ -OH) Hydroxy alcohols, triglycerides, diglycerides, and the like) such as compounds and / or alkanols of high melting point at 90 캜 or higher, hydroxy esters, fatty alcohols, triglycerides, diglycerides, , Sterols, steryl esters, and the like, which are intended to be broadly interpreted. The fatty acids may be fatty acids having a C ₄ -C ₃₀ alkyl group, such as C ₁₆ -C ₁₈ fatty acids, C ₁₈ -C ₂₈ fatty acids and / or C ₂₀ -C ₂₆ fatty acids. The fatty acid may be saturated or unsaturated. Some or all of the fatty acids may be attached or attached to other molecules such as triglycerides. Other examples tetradecyl Kano ripening (tetradecanoic) (pre-stick (myristic), C _14); Hexadecanoic (palmitic, C ₁₆ ); Octadecadienoic (linoleic linoleic), _C18 ); 9,12-octadecadienoic (linoleic linoleic), _C18 ); 7-octadecadienoic (C ₁₈ ); Heptadecanoic (margaric, C ₁₇ ) or octadecanoic (stearic, C ₁₈ ); Docosanoyl ripening (docosanoic) (Nick Behe (behinic), C _22); Tetracosanoic (lignoceric, C ₂₄ ); Hexacosanoic (cerotic, C ₂₆ ); And / or pentadecanoic (C ₂₅ ). The lipophilic content can be determined by measuring the amount extracted and extracted using a non-polar solvent such as dichloromethane. Thus, the term "lipophilic component" may also include oleophilic extracts.

The word " substantially "does not exclude" completely ". For example, a composition wherein Y is "substantially free " If necessary, the word "substantially" may be omitted from the definition of the invention.

Unless otherwise indicated, the terms "comprise" and "comprise" and their grammatical variations are intended to be taken to indicate an "open" or "inclusive" language, so that they not only include the referenced elements, Allows inclusion of non-existent elements.

As used herein, the term "about" is intended to mean, in the context of the components of the preparations, +/- 5% of the conventionally mentioned value, +/- 4% of the more commonly mentioned value, +/- 3% of the value, more typically +/- 2% of the stated value, even more usually +/- 1% of the mentioned value, and even more typically +/- 0.5%.

Certain embodiments throughout this disclosure may be disclosed in a range format. It should be understood that the description in a range format is merely for convenience and brevity, and should not be regarded as an unaltered limitation on the scope of the disclosed ranges. Accordingly, the description of a range should be regarded as having all possible subranges specifically disclosed, as well as having individual numerical values within this range. For example, a range of items ranging from 1 to 6 may include any of the specifically disclosed subranges such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, As well as individual numbers within the range, for example, 1, 2, 3, 4, 5 and 6. This applies irrespective of the width of the range.

Certain embodiments may also be described broadly and broadly herein. It forms part of the disclosure with groups of narrower species and subspecies corresponding to general disclosures. This includes a general description of embodiments in which the subject matter has been removed from the species, with or without passive limitation, irrespective of whether the removed material is specifically mentioned or not.

Detailed Description of the Embodiments

Hereinafter, exemplary and non-limiting embodiments of a pulp fiber composition will be disclosed. The pulp fiber composition may comprise acacia mangium fibers and acacia crassicarpa fibers. The pulp fiber composition may be comprised of acacia mucilage fibers and acacia crasscaria fibers. The pulp fiber composition may consist essentially of acacia mucilage fibers and acacia crasscarfa fibers.

The pulp fiber composition may consist of 100% of acacia species fibers. Thus, the pulp fiber composition may not require special adhesion chemicals (in excessive amounts) or addition of enzymes to reduce the amount of lipophilic contents in the pulp fiber composition. The acacia species fibers may be partially or completely original pulp fibers. The acacia species fibers may typically be cellulose fibers and may be acacia fibers from Asia, Indonesia, Africa, and tropical climates.

The pulp fiber composition may have a lower lipophilic content than the pulp of the prior art even though the amount of the acacia species present in the pulp fiber composition is substantially more than is acceptable in the prior art. For example, beyond this limit, increasing the amount of acacia species can lead to adhesion problems for Yankee dryer surfaces that result in poor runnability, reduced machine efficiency, and lower tissue quality Therefore, the amount of acacia species in conventional pulp may not exceed 35%.

However, we have found that by having a mixture of two acacia species (the total content of which is above the 35% limit of the prior art), the amount of lipophilic content in the resulting pulp fiber composition is not increased, , Higher adhesion to the Yankee dryer surface and better tissue quality. This contradicts and contradicts the general view of the field that the limitation on the amount of acacia species present in the pulp should be set to avoid problems in tissue production.

Wherein said acacia mucilage fibers comprise at most about 35 wt%, at most about 30 wt%, at most about 25 wt%, at most about 20 wt%, at most about 15 wt%, at most about 15 wt% About 10 wt%, up to about 5 wt%, or up to about 0.1 wt%, by weight.

At least about 65 wt%, at least about 70 wt%, at least about 75 wt%, at least about 80 wt%, at least about 85 wt%, at least about 90 wt%, at least about 95 wt% or at most 99.9 wt% of the acacia crassifera, By weight of the composition.

The pulp fiber composition may have a collapse index of less than 0.420, less than 0.415, less than 0.410, less than 0.405, or less than 0.400. By increasing the disintegration index, the void volume for incorporation of water after pressurization can be minimized, resulting in a reduction in the amount of free water content in the fibers. This contributes to reducing the amount of heat energy required to evaporate water from the fibers in the Yankee dryer since the amount of water in the pulp fiber composition is reduced. The collapse index (or collapse resistance index: CRI) is calculated based on the following equation (1).

[Formula (1)

The pulp fiber composition may have an adhesion to a Yankee dryer of at least about 5.0 N / m, at least about 5.5 N / m, at least about 6.0 N / m, at least about 6.5 N / m, or at least about 7.0 N / m. Adhesion of the acacia pulp to the Yankee dryer depends on the hydrophobic (or carbohydrate) contents as well as the hydrophobic (or lipophilic) contents. The hydrophilic components are carbohydrates (alpha, beta, gamma-cellulose, arabinose, Galactose, Xylose, Glucose and Mannose) They consist of fatty acids, fatty alcohols, ferulic acids, glycerides and sterols. Increased hydrophilicity or carbohydrate content in the pulp, such as increased hemicelluloses (arabinose, galactose or xylose), glucose and mannose content, will improve the adhesion of the pulp to the Yankee dryer surface, water retention value. The improvement in the adhesion of the pulp to the Yankee dryer is due to the presence of the hydrophilic components acting as an adhesive. The increased rate of water then increases the water content of the pulp, which then adheres the pulp to the metal surface (the Yankee dryer surface) due to water drag on the metal surface through its surface tension and polar attraction . Since the acacia contains less hemicellulose content than eucalyptus, the hydrophilic content in the acacia pulp can be maintained by a lighter pulping process. The hydrophobic components then prevent adhesion to hot metal surfaces. Accordingly, the amount of hydrophilic and hydrophobic components needs to be appropriately controlled and adjusted in order to obtain the desired adhesive force for the Yankee dryer.

The pulp fiber composition may comprise about 0.05% to about 0.15%, about 0.05%, about 0.06%, about 0.07%, about 0.08%, about 0.09%, about 0.10%, about 0.11%, about 0.12% 0.14% or about 0.15% (when extracted with dichloromethane). A standard test for determining the lipophilic content by solvent extraction may be the international standard TAPPI T204 cm07. By controlling the amount of lipophilic contents in the pulp fiber composition, it is still ensured that long chain carbon fatty acids and fatty alcohols (C24 to C28) are present at a controlled level to increase adhesion to the Yankee dryer , The pulp fiber composition can be used to produce tissues of excellent quality.

The pulp fiber composition may have a hemicellulose content of at least about 14.5%, about 15%, or about 20%.

Thus, owing to the presence of acacia crassicarga (which gives high fiber collapsibility and low CRI) and acacia manganese (which provides long chain carbon-oleophilic materials with high melting points), the lipophilic content This results in a tissue with excellent flexibility and opacity, as the pulp fiber composition has excellent adhesion and reduced energy requirements to the Yankee dryer surface, while ensuring a point of up to 0.15%.

In order to form the pulp fiber composition, a fixed ratio of acacia mucilage wood chips and acacia crasscarf wood chips (e.g., 35% to 65% of each) are transferred from a chip pile ≪ / RTI > The mixture of wood chips may be mixed with a white liquor, a Weak Black Liquor (WBL) and a Hot Black Liquor (WBL) to reach the desired cooking kappa (e.g. in the range of 17-19). HBL) in the digester. Kappa is an indirect measure of the degree of wood delignification. The steamed pulp will be screened to remove any undamaged wood chips and will be cleaned to improve cleanliness before the next step. The washed pulp then enters an oxygen delignification (ODL) step to further remove lignin by using oxygen, oxidized white liquor and caustic. The pulp (using ClO ₂₎ D stage after, EOP stage enters the bleaching (bleaching) steps, such as the last D-stage (using ClO ₂₎ after (using oxygen, caustic and peroxide), and . Cleaning steps are applied between each bleaching step to improve cleanliness of the pulp prior to the next step. After the pulp is bleached to the brightness required by the end consumer, the pulp is stored in the slurry reservoir before entering the pulper dryer. In the pulper dryer, the pulp slurry is then further cleaned to remove dust particles. The slurry is formed into a fiber mat as the water is removed, and then pressurized to continue the removal of water before further drying in a hot air dryer. The dried pulp sheets (with the acacia mucilage fibers and acacia crasscarf fibers inside) are then cut to its bale size and wound for transport.

The pulp fiber composition described above can be used to form a printing paper such as a tissue paper. A method of producing a printing paper may include drying a pulp fiber composition comprising acacia mucilage fibers and acacia crisscaraxa fibers to form a dried printing paper. The degree of drying of the tissue paper prior to the Yankee is at least about 24.2%, at least about 24.3%, at least about 24.4%, at least about 24.5%, at least about 24.6%, at least about 24.7%, at least about 24.8% To about 25.0%.

The drying step may be initiated in a Yankee dryer. The pulp fiber composition may be dried to an acceptable degree of drying in the Yankee dryer prior to scrapping with a doctor blade. The pulp fiber composition can be adhered to the Yankee dryer surface without the use of special adhesive chemicals or pretreatment due to its low lipophilic content.

Still on the Yankee dryer, the dried printing paper can be scraped with doctor blades mounted on the yam cylinder to crepe the paper. Thus, the method may further comprise creping the dried printing paper to form a creped printing paper. The creping may be controlled by the adhesion of the pulp to the Yankee dryer, the geometry of the doctor blade, the speed difference between the Yankee and the final part of the paper machine, and pulp properties.

The method may further comprise pressing the creped printing paper to form a paper product. This may involve winding, cutting and packaging the creped print paper to form the paper product, such as wrapped tissue paper.

G., At least about 13.1 cm3 / g, at least about 13.2 cm3 / g, at least about 13.3 cm3 / g, and most preferably at least about 13.3 cm3 / g. The tissue paper formed from the pulp fiber composition comprising acacia mucilaginous fibers and acacia crassifera fibers, , At least about 13.4 cm3 / g, or at least about 13.5 cm3 / g of tissue bulk property. The tissue sheet has a transverse tissue tension of at least about 7.5 Nm / g, at least about 7.6 Nm / g, at least about 7.7 Nm / g, at least about 7.8 Nm / g, at least about 7.9 Nm / (Tissue tensile index cross direction). The tissue sheet has a longitudinal tensile index machine direction of at least about 9 Nm / g, at least about 9.5 Nm / g, at least about 10 Nm / g, at least about 10.5 Nm / . The tissue sheet may have a tissue softness of at least about 13 or at least about 14. The tissue sheet may have a tissue opacity of at least about 56%, at least about 57%, at least about 58%, at least about 59%, or at least about 60%.

Examples

Non-limiting examples and comparative examples of the invention will be described in more detail with reference to specific examples which should not be construed in any way as limiting the scope of the invention.

Experimental Example 1

Acacia myrtle wood chips and acacia crasscarf wood chips were mixed at various ratios prior to pulping (as described above), and the resulting pulp was mixed with the fiber structure, the lipophilic contents, and the Yankee dryer It was characterized to determine adhesion.

Fiber structure

The fiber structure was obtained by measurement in a fiber morphology testing instrument (such as Kajaani Fiber lab., Fiber Master, or FQA instrument). Overall, the fining structure or fiber morphology is the result of the average pieces of individual fibers contained within the pulp. For example, a milligram of pulp contains 10,000-28,000 pieces of fibers.

By having a lower collapse resistance index, the pore volume for incorporation of water after pressurization can be reduced or minimized. A lower collapse resistance index also results in a lower free water content. Figure 1 shows the fiber structure of various pulp mixtures of acacia myrtle and acacia crassicarra. As shown in Figure 1, 11 pulp mixtures were investigated, where the first sample was 100% acacia moss plum (sample AM100AC00) without acacia crassicar, and the subsequent samples were 100% acacia crassicar (AM00AC100) was gradually reduced to 10% until the final sample (sample AM00AC100) containing the sample was used (samples AM90AC10, AM80AC20, AM70AC30, AM60AC40, AM50AC50, AM40AC60, AM30AC70, AM20AC80, AM10AC90 ). It can be seen that the collapse resistance index was reduced by having 65% or more of acacia crassiacar in the pulp. By conserving mainly carbohydrates as the hemicellulose content (at least 14.5%) in the pulp, the pulp can be attached to the surface of the Yankee dryer as well as the water content of the pulp after pressurization before the dryer.

Lipophilic content analysis

The lipophilic content in acacia myrtle and acacia crassicarra was confirmed by extraction with a nonpolar or lipophilic solvent. The extracted lipophilic substances were confirmed using a gas chromatography (GC) analyzer. The test procedure used here is for the standard test TAPPI T204 cm07 process .

Laboratory extraction of wood and pulp with dichloromethane solvent has found that acacia myrtle contains substances more lipophilic than acacia crassicarra. Acacia myrtle wood contains 1.21% lipophilic contents while Acacia crassicarum wood contains 0.33% lipophilic contents. Acacia myrtle um pulp contains 0.29% lipophilic contents whereas acacia crassi carp pulp contains 0.10% lipophilic contents.

Another analysis of oleophilic components between acacia myrtle and acacia crassicarum wood was performed using GC analysis followed by hexane extraction. Figure 2 shows the general composition of extracted lipophilic materials in two types of acacia wood. As shown in Figure 2, Acacia muntum wood contains more fatty acids, fatty alcohols, ferulic acids, glycerides and sterols than acacia crassicar wood. Due to the lipophilic contents of 80%, which are linear fats and saponifibles, this contributes to the purifying effect of acacia wood. In comparison, the lipophilic contents in other hardwoods, such as eucalyptus, are in the form of polymer resins and non-saponifiable fats which cause dust or deposition problems in the paper or tissue making process, Problems associated with the cleanliness of the tissue product.

In addition, the evaluation of the lipophilic component element by GC is as shown in Fig. 2, since the majority of the elements having a very high acacia mothball are long chain carbon fatty acids and fatty alcohols (C24 to C28) Indicating that it is difficult to reduce the content. Figures 3 and 4 show the collapse of lipophilic components by the number of carbon atoms in both acacia species. However, these long chain elements in acacia do not affect dust or deposition in the paper or tissue making process. The melting points of these long chain carbon fatty alcohols are very high (above 75 ° C, see FIG. 5) and have been found to have additional effects on adhesion problems on hot Yankee surfaces. It is therefore important that the amount of long chain carbon components in the lipophilic portion of the acacia pulp is controlled. The present inventors have found that DCM extractability has a lipophilic content equal to or less than 0.16%, thereby providing the best adhesion to the Yankee dryer surface with reference to FIG. Therefore, a target value of lipophilic level equal to or less than 0.16% was used as DCM extractable to achieve the best acacia pulp grade for tissue production.

As indicated above, the amount of long chain oleophilic carbon components in the acacia myrtle was about 17 times that in the acacia crassiaca. By grasping the amount of lipophilic contents in the acacia myrtle and acacia crassicarga pulp mixture was obtained which is the result of having lipophilic contents equal to or less than 0.15%. Laboratory pulping results show that in the case of <30% acacia moss (and over 70% acacia crassicarra), referring to FIG. 7, the pulp mixture had DCM extractable lipophilic content of less than 0.18%. The laboratory pulping was performed with conventional cooking and cleaning (at room temperature tap water) made manually at room temperature for each step of the pulping process. As compared to pulp mill pulp, the pulp mixture with ≤35% of acacia manganese (and ≥65% of acacia crassicar) has a total lipophilicity equal to or less than 0.16% Respectively. While the process used to obtain the pulp (the laboratory wash was carried out with tap water at room temperature, the pulp mill process was carried out at an average temperature of 75 DEG C at high points at some points to remove the enhanced lipophilic material in the pulp mill process , The higher lipophilic content was obtained in the laboratory treated pulp. &Lt; tb &gt; &lt; TABLE &gt;

Based on the foregoing, a pulp mixture containing acacia manganese equal to or less than 35% was selected for further evaluation (hereinafter referred to as Acacia XP pulp). Such a pulp mixture advantageously has good adhesion on a Yankee dryer even though the pulp is 100% acacia. Thus, such pulp is a conventional technical prejudice that the amount of acacia species present in the pulp was typically limited to a maximum of 35% due to problems of poor adhesion and durability when using pulps containing 35% or more acacia species Can be overcome. In order to reduce the amount of acacia species in the pulp to improve the adhesion to the Yankee dryer, conventional methods involve the use of special adhesive chemicals or pretreatment of the acacia pulp, And increased production costs. These examples thus show that pulp with 35% or more of acacia species can be easily obtained by using a mixture of two types of acacia species without any additional chemicals or pretreatment processes compared to conventional methods Prove that. If the disclosed pulp contains 100% acacia species, the resultant tissue will be smoother with a good tissue appearance.

Experimental Example 2

The acacia XP pulp (with 35% acacia mucilage and 65% acacia crassiacar) was compared to other types of pulp and characterized by Yankee dryer, pulp dryness, tissue tensile strength and tissue quality.

Compared to other types of pulps based on standard acacia (made from an uncontrolled chip mixture of 40% minimum acacia mucilage content and some eucalyptus), mill A eucalyptus, wheat F eucalyptus and wheat S eucalyptus, The Acacia XP pulp was shown to have excellent durability in the tissue making process with higher adhesion to the Yankee dryer with reference to FIG. Wheat A eucalyptus, wheat F eucalyptus and wheat S eucalyptus were respectively obtained commercially from Arauco (Chile), Fibria (Brazil) and Suzano (Brazil).

Pulp dryness of the various pulp samples was investigated later. The high fiber collapsibility of the acacia manganese in the acacia XP pulp by incorporating ≤35% acacia manganese in the acacia XP pulp is up to 24.9% higher than the other pulp samples referring to FIG. 10 before the Yankee dryer Thereby improving the drying degree. This results in thermal energy savings during tissue manufacturing while maintaining improved adhesion to the Yankee dryer surface.

By the lighter pulping process, by containing? 35% acacia manganese and? 65% acacia crassiacar, the best fiber properties are obtained which yield high initial tensile and excellent strength afterwards.

Experimental Example 3

The Acacia XP pulp was subsequently formed into a tissue. The Acacia XP pulp may pass through an optional refiner before mixing in a blending chest. The blended pulp then enters the pressure screen stage to further remove impurities and dust. After screening, the pulp is conveyed to the head box (not shown) at a controlled supply concentration before being injected into a forming board (or in a modern paper machine, this forming board is replaced with a twin wire forming system) (Headbox) stage. After the water is removed, the pulp web is pressed to remove more water. The web is then dried in a Yankee dryer. Pulp floating, sticking and creeping behavior will determine the final tissue quality. The amount of lipophilic contents in the pulp plays a large role in this process. Bonding and release agent chemicals can be added to the Yankee dryer process to optimize tissue quality and drying productivity. It should be noted that the paper machine technology may be different, so that the above description provides only one way of forming the tissue. Other methods known to those skilled in the art may be utilized instead.

The acacia XP pulp required half or less refining energy requirements compared to that required for eucalyptus with reference to FIG. This showed the high energy savings of electricity required for the pulp refining process and showed a potential reduction in softwood fiber consumption in the tissue manufacturing process.

After the Yankee dryer process, the Acacia XP shows longitudinal (MD) and transverse direction (CD) tensile index values superior to standard Acacia and Eucalyptus (average) samples with reference to FIG. This indicates that Acacia XP provides better durability during tissue conversion processes (winding, cutting and packaging). The bulk properties of the tissue slightly increased for acacia XP than for standard acacia and eucalyptus, resulting in higher tissue bulk. Such bulk will have a major impact on packaging and transport, since higher bulk will have fewer tissue sheets in a certain volume in a tissue package or rolls.

Experimental Example 4

The final tissue formed from the Acacia XP pulp was characterized in terms of tissue flexibility and opacity quality. From a consumer point of view, tissue texture, flexibility and visual appearance are part of the consumer's expectations. Acacia XP had the best tissue flexibility compared to other pulps; This was achieved through its distinctive properties of fibrous nature and improved creeping quality after Yankee drying. Tissue Opacity Also referring to Figure 13, it was the best among the pulp samples tested due to the higher fiber population (fibers per gram) of Acacia XP. This will provide a more visual appearance of a better tissue similar to a cloth handkerchief in very thin or low gsm tissue. If desired, some wet strength enhancer may be added to the tissue for strength preservation in wet conditions, ensuring that the tissue can be discarded after use without clogging the toilet system.

Applications

The disclosed pulp fiber compositions can be used to form paper products such as tissue. The formed tissue may have excellent flexibility, opacity and strength. The disclosed pulp fiber compositions do not require any enzymatic treatment to reduce the lipophilic content or improve the adhesion to the Yankee dryer. Typically, special adhesion chemistries may not be required, but certain amounts of these chemicals may still be required to form a film layer between the Yankee and tissue papers.

It will be apparent that various other modifications and adaptations of the present invention will become apparent to those skilled in the art without departing from the spirit and scope of the present invention as defined by the following written claims It is intended to fall within the scope of the scope.

Claims (14)

A pulp fiber composition comprising acacia mangium fibers and acacia crassicarpa fibers. The pulp fiber composition of claim 1, wherein the acacia mucilage fibers are present in the pulp fiber composition at a weight concentration of at most 35 wt%. A pulp fiber composition according to claim 1 or 2, wherein the acacia crasscarf fibers are present in the pulp fiber composition in a weight composition of at least 65 wt%. 4. A pulp fiber composition according to any one of claims 1 to 3, wherein the pulp fiber composition has a collapse index of less than 0.420. The pulp fiber composition according to any one of claims 1 to 4, characterized in that it has a lipophilic content ranging from 0.05% to 0.15% (when extracted by dichloromethane) Lt; / RTI &gt; 6. The pulp fiber composition according to any one of claims 1 to 5, wherein the pulp fiber composition has a dryness of at least 24.2% or at least 24.5%. And drying the pulp fiber composition comprising acacia mucilage fibers and acacia crisscaraxa fibers to form a dried paper sheet. 8. The method of claim 7, further comprising creping the dried printing paper to form a creped printing paper. 9. The method according to claim 7 or 8, further comprising pressing the creped printing paper to form a paper product. A tissue sheet having a tissue bulk property of at least 13 cm 3 / g and formed from a pulp fiber composition comprising acacia mucilage fibers and acacia crassicarf fibers. 11. The tissue sheet of claim 10, having a tissue tensile index cross direction of at least 7.5 Nm / g. 12. The tissue sheet of claim 10 or 11, wherein the tissue sheet has a tissue tensile index machine direction of at least 9 Nm / g. A tissue sheet according to any one of claims 10 to 12 having a tissue softness of at least 13. 14. A tissue sheet according to any one of claims 10 to 13 having a tissue opacity of at least 56% or at least 58%.

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