TW201900983A - Method for manufacturing laminated pulp mold and device for manufacturing laminated pulp mold - Google Patents

Abstract

To provide a method for manufacturing and a device for manufacturing a laminated pulp mold such that the strength of the finished pulp mold is great and mold release is easily accomplished. A method for manufacturing a laminated pulp mold, wherein a laminated pulp mold is manufactured by forming a first pulp mold layer by a pulp mold method in a recycled wastepaper pulp slurry that includes 0-5% by mass cellulose nano fibers, next dehydrating the pulp mold intermediate, then forming a second pulp mold layer on the surface of the first pulp mold layer by a pulp mold method in a cellulose nano fiber slurry that includes 1-30% by mass recycled wastepaper pulp, and finally carrying out dehydration and drying.

Description

 Method for manufacturing laminated pulp mold and manufacturing device for laminated pulp mold  

The present invention relates to a method and apparatus for producing a pulp mold, and more particularly to a method and apparatus for producing a laminated pulp mold.

For example, as disclosed in Japanese Laid-Open Patent Publication No. 2012-214943, paper and papermaking methods containing cellulose nanofibers are in full swing. Moreover, research on aeronautical members, automobile members, and the like using a resin material containing cellulose nanofibers is also underway.

In the prior patent application (Japanese Patent Application No. 2016-190568), the following patent application is proposed for the purpose of a pulp mold containing a predetermined amount of cellulose nanofibers and having an improved strength. Pulp mold.

The pulp mold proposed in the prior patent application is a pulp mold comprising a cellulose nanofiber having a solid content of 0.01% by mass or more and a residual solid component mainly comprising waste paper recycled pulp.

In the above pulp mold, if the content of the cellulose nanofiber is increased, the strength is higher, but when the solid content of the cellulose nanofiber content exceeds 30% by mass, the molded article becomes difficult to be removed from the mold. If the mold is forced to be demolded, problems such as cracking may occur.

 [Previous Technical Literature]    [Patent Literature]  

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2012-214943.

Accordingly, an object of the present invention is to provide a method and apparatus for producing a laminated pulp mold having a high strength and a mold release which is high in strength.

The above object can be attained by the method and apparatus for producing a laminated pulp mold of the present invention comprising the following (1) to (4).

(1) A method for producing a laminated pulp mold, wherein a first layer of a pulp mold is formed by a pulp molding method in a waste paper recycled pulp slurry containing 0 to 5% by mass of cellulose nanofibers, and then The pulp mold intermediate is dehydrated, and then, in the waste paper recycled pulp slurry containing 1 to 30% by mass of the cellulose nanofiber, the second layer of the pulp mold is formed on the surface of the first layer of the pulp mold by the pulp molding method. Finally, dewatering and drying are carried out to produce a laminated pulp mold.

(2) The method for producing a laminated pulp mold according to the above (1), wherein a part of the first waste paper recycled pulp and/or the second waste paper recycled pulp is discarded by resin, rubber, or coffee grounds, tea residue, or the like. The fiber of the object is replaced.

(3) A manufacturing apparatus for a laminated pulp mold, comprising: a first copying table having a first papermaking mold, a first molding machine, a first container, and a first lifting unit; and the mesh body of the first papermaking mold The first papermaking mold has a first layer of a papermaking mold having a mesh body disposed on the surface and having a plurality of suction ports penetrating from the surface to the back surface; the first molding machine supporting the first papermaking die and used for The inside of the first papermaking mold is sucked; the first container stores a waste paper recycled pulp slurry containing 0 to 5% by mass of cellulose nanofibers; and the first lifting unit holds the first papermaking mold and supports the first The first molding machine of the papermaking mold moves up and down between the inactive position above the surface of the waste paper recycled pulp slurry and the action position immersed in the waste paper recycled pulp slurry; the second copying table has the second a papermaking mold, a second molding machine, a second container, and a second lifting unit, and a second layer of the papermaking mold is applied to the surface of the first layer of the pulp mold, wherein the second papermaking mold has a mesh body provided on the surface and a plurality of suction ports extending from the surface to the back surface; the second mode Supporting the second papermaking mold to attract the inside of the second papermaking mold; the second container storing the cellulose nanofiber slurry containing 1 to 30% by mass of the cellulose nanofiber; and the second lifting unit The action of the second papermaking mold and the second molding machine supporting the second papermaking mold on the surface of the cellulose nanofiber slurry and the effect of immersing in the cellulose nanofiber slurry a lifting unit; a drying unit; an upper mold for releasing the pulp mold intermediate body on the first and second papermaking molds; a second lifting unit for lifting the upper mold; and a transfer unit The upper mold is transferred in the order of the first paper-making structure, the second paper-making structure, and the drying unit.

(4) The apparatus for producing a laminated pulp mold according to the above (3), wherein a part of the first waste paper recycled pulp and/or the second waste paper recycled pulp is discarded by resin, rubber, or coffee grounds, tea residue, or the like. The fiber of the object is replaced.

In the method for producing a laminated pulp mold of the present invention, as described above, the first layer is formed by using a raw material slurry having a small content of cellulose nanofibers, and then the cellulose layer is used on the first layer. The raw material slurry having a large content of rice fibers forms the second layer to copy the paper pulp mold, so that the release of the pulp mold intermediate is easy, and the strength of the finished pulp mold is high.

Further, since the pulp of the pulp mold of the present invention uses recycled paper to reproduce pulp, there is an advantage that the natural environment and the earth resources can be preserved and protected.

10‧‧‧Manufacturing device for laminated pulp mold

12‧‧‧1st copying table

14‧‧‧1st papermaking mode

16‧‧‧Paper mode body

18‧‧‧ attracting mouth

20‧‧‧ net body

22‧‧‧1st molding machine

24‧‧‧1st papermaking structure

26‧‧‧1st container

28‧‧‧1st lifting unit

50‧‧‧2nd copying table

52‧‧‧4th papermaking mode

54‧‧‧Paper mode body

56‧‧‧ attracting mouth

58‧‧‧ net body

60‧‧‧1st molding machine

62‧‧‧Second papermaking structure

64‧‧‧2nd container

66‧‧‧2nd lifting unit

70‧‧‧Drying equipment

72‧‧‧Drying equipment body

74‧‧‧Transfer unit (conveyor)

80‧‧‧上模

82‧‧‧2nd lifting unit

84‧‧‧Transfer motor

86‧‧‧Transfer unit

88‧‧‧ Track

Fig. 1 is a schematic view showing an apparatus for manufacturing a laminated pulp mold according to an embodiment of the present invention.

Fig. 2 to Fig. 14 are explanatory views showing the steps of a method for producing a laminated pulp mold using the apparatus for producing a laminated pulp mold shown in Fig. 1 according to the embodiment of the present invention.

Fig. 15 is a cross-sectional view showing a papermaking mold used in the apparatus for manufacturing a laminated pulp mold according to an embodiment of the present invention.

 [Formation for carrying out the invention]  

Hereinafter, an apparatus for manufacturing a laminated pulp mold according to an embodiment of the present invention will be described.

The manufacturing apparatus 10 of the laminated pulp mold includes a first copying table 12 and a second copying table 50 disposed on the downstream side of the first copying table 12.

The first copying table 12 is provided with a first papermaking die 14 (see FIG. 15) having a predetermined outer shape (making surface), and the papermaking die main body 16 of the first papermaking die 14 is formed at equal intervals on the main body. A plurality of suction ports 18 that pass through the entire surface (inner surface) to the back surface (outer surface). Further, a net body 20 is disposed on the papermaking mold main body 16.

The first papermaking die 14 is fixedly supported by the first molding machine 22. Hereinafter, the combination of the first papermaking mold and the molding machine will be referred to as a first papermaking mold structure 24. The first molding machine 22 sucks the inside by a suction pump (not shown). A first container 26 is disposed in a lower portion of the first copying table 12, and accommodates a waste paper recycled pulp slurry containing 0 to 5% by mass of cellulose nanofibers. A part of the waste paper recycled pulp in the waste paper recycled pulp slurry can be replaced with fibers such as resin, rubber, or the like, or waste such as coffee grounds or tea leaves.

In the first papermaking mold structure 24, the first papermaking mold 14 is placed above the surface of the waste paper recycled pulp slurry contained in the first container 26 by, for example, the first lifting unit 28 including a hydraulic cylinder. The inoperative position (see FIG. 1 and the like) is raised and lowered between the position (see, for example, FIG. 2) immersed in the waste paper recycled pulp slurry. The first layer of the papermaking mold is placed on the net body 20 of the first papermaking mold 14 by the first copying table 12 having the above structure.

The second papermaking table 50 has the same structure as the first papermaking mold 14, and includes a second papermaking mold 52 (see FIG. 15) having a predetermined outer shape (making surface), and papermaking in the fourth papermaking mold 52. The mold main body 54 is formed with a plurality of suction ports 56 which are provided at equal intervals on the entire body and penetrate from the front surface (inner surface) to the back surface (outer surface). Further, a net body 58 is disposed on the papermaking mold main body 16.

The second papermaking mold 52 is fixedly supported by the first molding machine 60. Hereinafter, the combination of the second papermaking mold and the molding machine will be referred to as a second papermaking mold structure 62. The second molding machine 60 is sucked into the interior by a suction pump (not shown). A second container 64 is disposed in a lower portion of the second table 50, and accommodates a cellulose nanofiber slurry containing 1 to 30% by mass of cellulose nanofibers. A part of the waste paper recycled pulp in the waste paper recycled pulp slurry may be replaced by fibers such as resin, rubber, or the like, or waste such as coffee grounds or tea leaves.

In the second papermaking mold structure 62, the second papermaking mold 52 is placed above the surface of the waste paper recycled pulp slurry contained in the second container 64 by, for example, a second lifting unit 66 composed of a hydraulic cylinder. The inoperative position (see FIG. 1 and the like) is raised and lowered between the position (see, for example, FIG. 9) immersed in the waste paper recycled pulp slurry. The second papermaking table 50 having the above structure is used to apply the second layer of the paper pulp mold to the first layer of the pulp mold on the net body 58 of the second papermaking mold 52, thereby completing the pulp mold for fabricating the product structure.

A drying device 70 is provided on the downstream side of the second table 50. This drying device 70 includes a drying device main body 72 having a heater (not shown) having an arbitrary structure, and a transfer unit (conveyor) 74 that transfers the pulp mold from the second copy forming table 50 to the drying device main body 72. .

An upper mold 80 that is released from the pulp mold intermediate body (the first layer of the pulp mold) on the first papermaking mold 14 is provided on the upper portion of the first papermaking table 12. Therefore, the upper mold 80 is provided with a suction pump (not shown). The upper mold 80 can be raised and lowered by a second lifting unit 82 such as a hydraulic cylinder.

Further, the upper mold 80 is further provided with a transfer unit 86 including a transfer motor 84, and the transfer unit 86 transfers the first copy table 12, the second copy table 50, and the drying device unit 72 along the rail 88 in this order.

Next, a method of manufacturing a laminated pulp mold using the apparatus 10 for manufacturing a laminated pulp mold having the above structure will be described.

First, in the first papermaking table 12, the first papermaking mold structure 24 is lowered from the state of FIG. 1 to the working position of FIG. 2, and the first papermaking mold 14 is immersed in the waste paper recycled pulp in the first container 26. In the slurry, the first molding machine 22 is sucked, and the solid component in the waste paper recycled pulp slurry is deposited on the net body 20 (see FIG. 15) of the first papermaking mold to form the first layer of the pulp mold. The suction system is carried out for about 1 to 30 seconds to form a first layer of a pulp mold having a thickness of about 1 to 5 mm in an undehydrated state.

After the first layer of the pulp mold in the undehydrated state is formed, the first papermaking mold structure 24 is raised to the inoperative position of FIG. 3, and in this state, the first layer of the pulp mold is sucked by the first molding machine 24 to perform Dehydration. This dehydration is carried out for about 5 to 60 seconds, and the water content of the first layer of the pulp mold is set to about 5 to 80%. The thickness of the first layer of the pulp mold after the dehydration is about 1 to 5 mm.

After the dehydration, the upper mold 80 is lowered and covered on the first layer of the pulp mold on the first papermaking mold 14, as shown in Fig. 4. By sucking the upper mold 80, the first layer of the pulp mold is passed from the first papermaking mold 14. The mold is demolded and held in the upper mold 80 by suction.

Thereafter, as shown in FIG. 5, the upper mold 80 is raised, and then, as shown in FIG. 6, the upper mold 80 is transferred to the second copying table 50. Then, the upper mold 80 is lowered from the position of FIG. 6 to the position of FIG. 7, and covers the second papermaking mold 52. In this state, the second molding machine 60 is passed through the pulp mold held by the upper mold 80. One layer is attracted to the second papermaking mold 52.

Then, the upper mold 80 is raised as shown in FIG. 8, and then the second papermaking mold structure 62 is lowered as shown in FIG. 9, and the second papermaking mold 52 is immersed in the cellulose in the second container 64. In the nanofiber slurry, the solid component of the cellulose nanofiber slurry is deposited by the second molding machine 60, and the solid component of the cellulose nanofiber slurry is deposited on the first layer of the pulp mold on the mesh body 58 of the second papermaking mold (see FIG. 15). On top, the second layer of the pulp mold is formed. The suction system is carried out for about 5 to 60 seconds to form a second layer of the pulp mold in an undehydrated state having a thickness of about 1 to 5 mm.

After the second layer of the pulp mold in the undehydrated state is formed, the second papermaking mold structure 62 is raised to the inoperative position of FIG. 10, and in this state, the first and second layers of the pulp mold are sucked by the second molding machine 62. Layer for dehydration. This dehydration is carried out for about 5 to 60 seconds, and the water content of the first layer and the second layer of the pulp mold is set to about 10 to 80%. The total thickness of the first layer and the second layer of the pulp mold after dehydration is about 1 to 5 mm.

After the dehydration, as shown in FIG. 11, the upper mold 80 is lowered to cover the first and second layers of the pulp mold on the second papermaking mold 52, and the upper mold 80 is attracted to the first layer of the pulp mold. The second layer is released from the second papermaking mold 52, and is attracted and held in the upper mold 80.

Thereafter, as shown in Fig. 12, the upper mold 80 is raised, and then, as shown in Fig. 13, it is transferred to the transfer unit (conveyor) 74 of the drying apparatus 70, and then, by blowing, as shown in Fig. 14. It is shown that the pre-drying pulp mold P is detached onto the transfer unit (conveyor) 74, and moved to the drying apparatus body 72 and dried to complete the pulp mold.

[Examples]

A waste paper-recycled pulp slurry containing no cellulose nanofibers is used as the first layer of the pulp mold, and a waste paper recycled pulp slurry containing 1% by mass of cellulose nanofibers as a solid component is used as the second layer. The pulp mold P-1 of the example was produced by the above-described production method. On the other hand, a pulp mold P-2 of a comparative example was produced in the following manner: a cellulose resin containing 1% by mass was coated with a brush on the first layer having the same structure as that of the first layer of the example. The waste paper recycled pulp slurry of the fiber is formed as a solid component for the second layer and dried.

Further, regarding the waste paper recycled pulp slurry, first, a waste paper (confidential document, newspaper, corrugated paper, etc.) is dissolved by a pulper, and then foreign matter such as garbage which is not suitable for the product is removed from the raw material by a foreign matter removing device. Then, in the finished pulp mold, cellulose nanofibers are added in such a manner that the content of the cellulose nanofibers is 1% by mass, and the concentration of the slurry is adjusted to obtain the cellulose nanofiber-added waste paper regeneration. Pulp slurry.

The samples prepared in the above examples and comparative examples were cut out, and the samples were used to measure the tensile strength and the breaking strength of the samples.

As a result, in the structure of the example, the tensile strength was 276 N and the breaking strength was 456 kPa, and in the comparative example, the tensile strength was 254 N and the breaking strength was 386 kPa.

experiment method

Both tests were carried out in a constant temperature and humidity chamber set to 20 ° C and 65% RH.

Tensile strength test

Using a constant-speed elongation type tensile testing machine (RTF-1250, manufactured by A&D Co., Ltd.)

Test piece width: 50mm

Grab interval: 200mm

Stretching speed: 200mm/min

Number of trials: 3 times

Bursting strength test

MULLEN rupture tester (high pressure type) (M2-HD made by Toyo Seiki Co., Ltd.)

Measuring surface: the surface in contact with the rubber diaphragm

(Broken from the face of the mesh toward the uneven surface.)

Number of trials: 10 times

From the above tests, the efficacy of the present invention can be clearly understood.

Further, after observing the ease of release of each sample, it was confirmed that both of the examples and the comparative examples were good.

That is, according to the present invention, it is possible to manufacture a laminated pulp mold having high strength while ensuring ease of demolding.

Claims (4)

 A method for producing a laminated pulp mold, wherein, in a waste paper recycled pulp slurry containing 0 to 5% by mass of cellulose nanofibers, a first layer of a pulp mold is formed by a pulp molding method, and then a pulp mold is intermediate The body is dehydrated, and then, in the waste paper recycled pulp slurry containing 1 to 30% by mass of the cellulose nanofiber, the second layer of the pulp mold is formed on the surface of the first layer of the pulp mold by the pulp molding method, and finally, The laminated pulp mold was produced by dehydration and drying.    The method for producing a laminated pulp mold according to the first aspect of the invention, wherein the first waste paper recycled pulp and/or the second waste paper recycled pulp are partially made of resin, rubber, or coffee grounds, tea residue, or the like. The fiber of the waste is replaced.    A manufacturing apparatus for a laminated pulp mold comprising: a first copying table having a first papermaking mold, a first molding machine, a first container, and a first lifting unit; and the papermaking pulp is applied to the net body of the first papermaking mold The first layer of the mold, wherein the first papermaking mold has a mesh body provided on the surface and has a plurality of suction ports penetrating from the surface to the back surface; the first molding machine supports the first papermaking die and is for sucking the first papermaking die a inside of the papermaking mold; the first container stores a waste paper recycled pulp slurry containing 0 to 5% by mass of the cellulose nanofiber; and the first lifting unit includes the first papermaking mold and the first papermaking mold The first molding machine moves up and down between the inactive position above the surface of the waste paper recycled pulp slurry and the action position immersed in the waste paper recycled pulp slurry; the second copying table has the second papermaking mold, The second molding machine, the second container, and the second lifting unit, and the second layer of the papermaking pulp is applied to the surface of the first layer of the pulp mold, wherein the second papermaking mold has a mesh body provided on the surface and has a surface a plurality of suction ports penetrating to the back; the second molding described above Supporting the second papermaking mold for sucking the inside of the second papermaking mold; the second container storing the cellulose nanofiber slurry containing 1 to 30% by mass of the cellulose nanofiber; and the second lifting unit The action of the second papermaking mold and the second molding machine supporting the second papermaking mold on the surface of the cellulose nanofiber slurry and the effect of immersing in the cellulose nanofiber slurry a lifting unit; a drying unit; an upper mold for releasing the pulp mold intermediate body on the first and second papermaking molds; a second lifting unit for lifting the upper mold; and a transfer unit The upper mold is transferred in the order of the first paper-making structure, the second paper-making structure, and the drying unit.    The apparatus for manufacturing a laminated pulp mold according to the third aspect of the invention, wherein the first waste paper recycled pulp and/or the second waste paper recycled pulp are partially made of resin, rubber, or coffee grounds, tea residue, or the like. The fiber of the waste is replaced.