Pulp containing tea seed oil extraction residue and pulp product produced from said pulp, and method for producing pulp containing tea seed oil extraction residue

Abstract

To provide a pulp and a pulp product having an antioxidant function by adding a tea seed squeezed oil residue to the raw material pulp, and to provide a method for producing the pulp to which the tea seed squeezed oil residue is added.SOLUTION: A pulp according to the invention is formed by processing a residue discharged when oil-squeezing a tea seed embryo into a powder to form a powder residue, adding the powder residue to a raw material pulp, adding water to form a pulp slurry, and preparing the pulp slurry for papermaking, followed by dehydrating. Furthermore, the pulp is thermally molded within a mold to manufacture various pulp products such as tableware such as plates and trays and lunch containers.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to pulp to which tea seed oil expression residue has been added, a pulp product produced from the pulp, and a method for producing pulp to which tea seed oil expression residue has been added, and more particularly to pulp having antioxidant function by utilizing the antioxidant components contained in tea seed oil expression residue, a pulp product produced from the pulp, and a method for producing pulp to which tea seed oil expression residue has been added. [Background technology]

[0002] In recent years, tea seed oil has been attracting attention as a healthy oil because it is known to be rich in oleic acid like olive oil and to have a low content of saturated fatty acids. This tea seed oil is produced by extracting the seed embryo from the tea seed and squeezing the oil component contained in the seed embryo (for example, see Patent Document 1).

[0003] Furthermore, in recent years, the demand for tea-based beverages has grown due to the growing consumer preference for health drinks, and the amount of hydrated tea leaves discharged has increased accordingly. For this reason, it has been proposed to reuse tea leaves by wet-grinding them and adding them to raw pulp, while producing raw pulp with antibacterial and deodorizing properties (see, for example, Patent Document 2).

[0004] Disposable tableware and lunch boxes made from raw pulp are preferable because they place less of a burden on the environment when disposed of compared to tableware and lunch boxes made from petroleum. On the other hand, in lunch boxes and the like, measures have been taken to prevent food deterioration, such as by including sheets impregnated with antioxidant compounds or sinigrin, the spicy component of wasabi (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-152749 A [Patent Document 2] JP 2008-255515 A [Patent Document 3] Japanese Patent Application Publication No. 3-222574 Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 2 proposes using tea leaves generated during tea extraction to add them to raw pulp to produce pulp with antibacterial and deodorizing properties. However, the inventors discovered that the tea seed residue (pomace) generated in the process of producing tea seed oil, as in Patent Document 1, contains a lot of antioxidant substances.

[0007] In addition, as in Patent Document 3, it has been proposed to include sheets impregnated with antioxidant compounds or sinigrin in order to prevent food deterioration, but there have been no pulp products such as tableware or lunch containers that have antioxidant properties in themselves.

[0008] Therefore, an object of the present invention is to provide pulp and pulp products having antioxidant properties by adding tea seed oil extraction residue to raw pulp. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the pulp containing tea seed oil expression residue of the present invention is characterized in that tea seed oil expression residue discharged when the seed embryo of tea seeds is pressed is processed into a powder to form tea seed oil expression residue powder, the powder is added to raw pulp, water is added to form a pulp slurry, the pulp slurry is prepared, paper is made from the pulp slurry, and the pulp is dehydrated to form the paper.

[0010] The pulp product of the present invention is characterized in that it is produced from pulp to which the tea seed oil extraction residue has been added, and it is preferable that the pulp product is tableware.

[0011] Furthermore, the method for producing pulp to which tea seed oil expression residue has been added of the present invention is characterized by sequentially carrying out the steps of processing tea seed oil expression residue discharged when the seed embryos of tea seeds are pressed into a powder form to form tea seed oil expression residue powder, adding the powder to raw pulp and then absorbing moisture to form a pulp slurry, preparing the pulp slurry and making paper, and dehydrating the made paper pulp. Effect of the Invention

[0012] Pulp made from the residue of tea seed oil extraction according to the present invention can produce pulp with antioxidant properties. In addition, while tea seed oil has been used as an effective use of tea seeds that were originally harvested by hand, the residue after oil extraction can also be effectively used, which is believed to lead to environmental conservation on land and the elimination of unpaid (low-wage) labor by agricultural workers.

[0013] Furthermore, by using this pulp to produce pulp containers such as plates, trays, lunch boxes, etc. (the pulp product of the present invention), it is possible to delay the oxidation and decay of foods stored in these containers, such as vegetables, fruits, fish, meat, eggs, etc. Furthermore, by using this pulp to produce pulp tableware such as straws, spoons, forks, knives, chopsticks, stirrers, etc. (the pulp product of the present invention), it is possible to provide tableware with antioxidant properties. [Brief description of the drawings]

[0014] [Figure 1] 1 is a flow chart showing a first step of producing pulp containing tea seed oil extraction residue of the present invention. [Diagram 2] 3 is a flow chart showing the second step of producing pulp containing tea seed oil extraction residue of the present invention. [Diagram 3] 1 is a graph comparing the magnitude of antioxidant effects of plates made using pulp containing tea seed oil extraction residue. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] FIGS. 1 and 2 are diagrams showing the process for producing pulp containing tea seed oil expression residue of the present invention. First, based on FIG. 1, the first step of processing the tea seed oil expression residue to be added to the raw pulp into powder will be described.

[0016] In the first step, the following steps are carried out in sequence: a seed embryo extraction step S1, in which the outer skin is removed from the harvested tea seeds and the seed embryos containing tea seed oil are extracted; the extracted seed embryos are dried, and then crushed and compressed to extract the tea seed oil in a pressing step S2; the tea seed oil extraction step S3, in which the pressed tea seed oil is extracted; a residue extraction step S4, in which the block-shaped residue is extracted after the tea seed oil has been extracted; a residue crushing step S5, in which the block-shaped residue is crushed; and a residue sieving step S6, in which the crushed residue is sieved. This allows for the production of tea seed oil expression residue powder (hereinafter referred to as powdered residue).

[0017] In the residue crushing step S5, the block-shaped residue (about 1 kg to 4 kg per piece) is crushed to about 40 mm, and then further crushed to 2 mm. In the residue sieving step S6, powdery residue of 1 mm to 10 mm is collected (the seed embryo removal step S1 to the residue sieving step S6 are steps for forming the powdery residue of the present invention).

[0018] Next, the second step of producing the pulp of the present invention by adding the powdery residue obtained in the first step to the raw pulp will be described with reference to FIG.

[0019] In the second step, the following steps are sequentially carried out: an adding step S7 of adding powdery residue to the raw pulp; a pulpering step S8 of cutting the fibers into long and short lengths to make them flexible after the pulp to which the powdery residue has been added is saturated with water (swelled); (the adding step S7 and the pulpering step S8 are steps of forming a pulp slurry in the present invention); a beating step S9 of beating (cutting or grinding) the pulp slurry after the pulpering step to fluff the fibers (fibrillate) and promote bonding; (the beating step S9 and the papermaking step S10 of evenly flowing the pulp slurry onto a wire (plastic net) to make paper; (the beating step S9 and the papermaking step S10 are steps of preparing a pulp slurry of the present invention and making paper); and (the dewatering step S11 of drying the pulp slurry through a press part and a dryer part; (the dewatering step S11 is a step of dewatering the paper-made pulp in the present invention). Thus, the pulp to which the powdery residue has been added is produced.

[0020] The types of raw materials used for the raw material pulp include wood raw materials made from conifers and broad-leaved trees, and non-wood raw materials made from kapok fruit, bamboo, Manila hemp, kenaf, etc., and the ratio of the tea seed oil expression residue powder added in the addition step S7 is 90-50% raw material and 10-50% tea seed oil expression residue powder. When coloring the pulp, the dyeing step S12 is performed after the beating step S9, and the papermaking step S10 is performed after the dyeing step S12.

[0021] The pulp produced through the first and second steps is processed through well-known processes into various pulp products such as plates, trays, lunch boxes, straws, spoons, forks, knives, chopsticks, stirrers, etc.

[0022] The pulp produced as described above contains antioxidant substances derived from the residue of tea seed oil extraction, and therefore, by using this pulp to produce pulp containers such as plates, trays, lunch boxes, etc., it is possible to delay the oxidation and decay of foods such as vegetables, fruits, fish, meat, eggs, etc. that are stored in these containers. Furthermore, even if this pulp is used to produce tableware other than pulp containers, such as straws, spoons, forks, knives, chopsticks, stirrers, etc., products having antioxidant properties can be provided.

[0023] Next, as shown in FIG. 3 and Table 1, the pulp produced as described above was used to form plates B and C by thermoforming using a mold, and the antioxidant activity of plates B and C was measured and compared using the conventional Trolox Equivalent Antioxidant Capacity (TEAC) method (hereinafter referred to as the "TEAC method").

[0024] Plate B was produced by adding powdered residue to the raw pulp at a rate of 10 w / w%, and plate C was produced by adding powdered residue to the raw pulp at a rate of 30 w / w%, and the TEAC method was used to examine the extent to which the antioxidant effect was maintained compared to the powdered residue (raw powder). In addition, the normal plate A (blank), produced only from raw pulp without the addition of powdered residue, was similarly examined by the TEAC method to examine the extent to which it retained its antioxidant effect, and used as a comparison. (The samples described below refer to the powdered raw materials of plates A to C.)

[0025] For the specimens of plates A-C and powdered residue, 4 mL of a mixture of 0.2 v / v% aqueous acetic acid and methanol (75:25) was added to 400 mg of cut dried samples of plates A-C and powdered residue, and the mixture was extracted by ultrasonic for 10 minutes, then filtered through a 0.45 μm membrane filter. The magnitude of the antioxidant effect of each specimen was compared by comparing the Trolox equivalent (μmol / L) of each specimen measured by the TEAC method.

[0026] As shown in Figure 3 and Table 1, the Trolox equivalent of the sample in plate B was 176.5 μmol / L, and the Trolox equivalent of the sample in plate C was 255.8 μmol / L. These correspond to 8.7% for the sample in plate B and 12.9% for the sample in plate C, relative to the powdered residue (raw powder). Although these antioxidant activities are reduced relative to the amount of powdered residue added to the raw pulp, they indicate that more than 40% of the antioxidant activity remains even after heat treatment such as thermoforming in a mold. On the other hand, in blank plate A, the Trolox equivalent was 0.55 μmol / L, and it showed almost no antioxidant activity, confirming that adding powdered residue can impart antioxidant function to paper plates.

[0027] [Table 1]

[0028] Furthermore, when the strength of plates B and C was checked, it was confirmed that they had sufficient strength. Therefore, they have sufficient strength and are practical for use in producing various pulp products such as not only plates but also tableware such as trays, lunch containers, straws, spoons, forks, knives, chopsticks, stirrers, etc. Furthermore, while conventional pulp products become fuzzy or peel off into powdery form due to fibrillation with use, it was confirmed that the surfaces of plates B and C mentioned above remain smooth even with repeated use and are less likely to fibrillate. [Explanation of symbols]

[0029] S1... Seed embryo extraction process, S2... Squeezing process, S3... Tea seed oil extraction process, S4... Residue extraction process, S5... Residue crushing process, S6... Residue sieving process, S7... Addition process, S8... Pulper process, S9... Beating process, S10... Paper making process, S11... Dehydration process, S12... Dyeing process

Claims

1. The pulp containing tea seed oil expression residue is characterized in that tea seed oil expression residue discharged when oil is expressed from the seed embryos of tea seeds is processed into a powder to form a tea seed oil expression residue powder, the powder is added to a raw pulp, and then moisture is impregnated to form a pulp slurry, and the pulp slurry is prepared, paper is made from the pulp slurry, and then dehydrated to form the pulp containing tea seed oil expression residue.

2. A pulp product produced from pulp containing the tea seed oil extraction residue according to claim 1.

3. 3. The pulp product of claim 2, wherein the pulp product is a tableware.

4. A step of processing tea seed oil expression residue discharged when oil is expressed from tea seed embryos into a powder form to form a tea seed oil expression residue powder; adding the powder to a raw pulp and then absorbing moisture to form a pulp slurry; preparing the pulp slurry and making paper; A process of dehydrating the paper-made pulp; A method for producing pulp containing tea seed oil expression residue, comprising the steps of:

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