KR102061495B1 - Husking roll - Google Patents

Abstract

An object of the present invention is to provide a detachment roll that is excellent in durability and difficult to expand during use, and is difficult to discolor during storage. The detachment roll of the present invention is a rubber layer laminated on a core portion and an outer circumferential surface of the core portion. A detachment roll provided with the said rubber layer, Comprising: The said rubber layer consists of hardened | cured material of the thermosetting urethane composition containing a polyol component, an isocyanate component, and a crosslinking agent, The said polyol component is a polyester polyol, The said isocyanate component is TDI and / or MDI and the crosslinking agent are 1,4-butanediol and 1,4-bis (β-hydroxyethoxy) benzene.

Description

Dislocation roll {HUSKING ROLL}

The present invention relates to a stripping roll.

An agricultural threshing machine is equipped with a stripping roll. This stripping roll uses two stripping rolls as a pair, and arrange | positions so that stripping rolls may have predetermined space | interval. In a pair of stripping rolls arranged in this manner, rice is removed by inserting rice (rice with chaff) into the gaps between the stripping rolls while rotating each stripping roll at a different main speed. Can be separated

As such a roll member, the roll member which consists of a cylindrical core material part and the rubber layer provided around it is generally used (for example, refer patent document 1).

The said rubber layer is formed using synthetic rubber, such as nitrile rubber (NBR) and styrene butadiene rubber (SBR), for example.

Japanese Unexamined Patent Publication No. 2001-029809

Since the detachment roll has the structure as described above, the rubber layer gradually wears out according to the detachment of the chaff, and when the thickness of the rubber layer becomes thin due to wear, the performance as the detachment roll cannot be exhibited. Therefore, when the thickness of the rubber layer reached the set value, it was necessary to replace the detachment roll.

Here, the conventional stripping roll had a problem that the stripping roll had to be replaced frequently due to insufficient durability (abrasion resistance) of the rubber layer.

As described above, in the stripping machine, the pair of stripping rolls are rotated and used at different main speeds, so that the stripping roll (main roll) on the side having the higher rotational speed has a lower rotational speed. It wears significantly compared with a detachment roll. For this reason, it is common to use the main roll and the sub-roll alternately two or three times until the thickness of the rubber layer reaches a set value due to wear. And in the conventional stripping roll as mentioned above, there also existed a problem that a main roll and a subroll must be exchanged frequently.

Therefore, the present inventors examined in order to provide the stripping roll which is excellent in durability, and discovered that the stripping roll with a rubber layer made of polyurethane was superior to the stripping roll with a rubber layer made of NBR or SBR. .

However, in the detachment roll provided with the polyurethane layer made of polyurethane, the rubber layer expands as the temperature of the rubber layer increases during use, so that the gap between the detachment rolls cannot be maintained, and the detachment rolls finally contact each other, and the detachment rolls It generates a large amount of heat due to the main speed difference of 周 速 差. And when the calorific value increased, the rubber layer made of polyurethane melted, and the desorption performance might fall and it might be damaged. Moreover, the rubber layer discolored at the time of storage, and the external appearance might make the deterioration of a stripping roll suspected.

Therefore, the present inventors made further examination, and completed the stripping roll provided with the rubber layer which is excellent in durability (abrasion resistance), difficult to expand at the time of use, and which is hard to discolor at the time of storage.

The detachment roll of this invention is a detachment roll provided with a core material part and the rubber layer laminated | stacked on the outer peripheral surface of the said core material part,

The said rubber layer consists of hardened | cured material of the thermosetting urethane composition containing a polyol component, an isocyanate component, and a crosslinking agent,

The polyol component is a polyester polyol,

The isocyanate component is TDI and / or MDI,

The crosslinking agent is characterized in that 1,4-butanediol and 1,4-bis (β-hydroxyethoxy) benzene.

In the stripping roll, the isocyanate component is preferably MDI.

Moreover, it is preferable that JIS-A hardness in 20 degreeC of the said rubber layer is 85 degreeC or more and less than 99 degrees in the said stripping roll.

In the detachment roll, the rubber layer preferably has a DIN wear loss of 60 to 100 kPa.

In the stripping roll of the present invention, since the rubber layer is made of a cured product of a specific thermosetting urethane composition, durability (abrasion resistance) is particularly excellent and can be used for a long time.

Moreover, in the said detachment roll, even if the temperature of a rubber layer rises at the time of use, since it is hard to thermally expand, the clearance gap between detachment rolls can be reliably maintained.

In addition, the said detachment roll hardly discolors at the time of storage.

1: (a) is a perspective view which shows an example of the detachment roll of this invention typically, (b) is a front view of the detachment roll shown to (a), (c) is AA sectional drawing of (a). .
It is a schematic diagram for demonstrating the use method of the stripping roll of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

A stripping roll of this invention is a stripping roll provided with the core part and the rubber layer laminated | stacked on the outer peripheral surface of the said core part, The said rubber layer consists of hardened | cured material of the thermosetting urethane composition containing a polyol component, an isocyanate component, and a crosslinking agent. The polyol component is a polyester polyol, the isocyanate component is TDI and / or MDI, and the crosslinking agent is 1,4-butanediol and 1,4-bis (β-hydroxyethoxy) benzene to be.

1: (a) is a perspective view which shows an example of the detachment roll of this invention typically, (b) is a front view of the detachment roll shown to (a), and (c) is sectional drawing of the A-A line of (a).

The detachment roll 10 shown to FIG. 1 (a)-(c) consists of the metal core material part 11 and the rubber layer 12 laminated | stacked on the outer peripheral surface of the core material part 11. FIG.

The core member 11 is a cylindrical member provided with a mounting flange 11a for attaching the detachment roll 10 to the detacher in the cylinder.

The rubber layer 12 is formed in the whole outer peripheral surface of the core material part 11 with uniform thickness.

The rubber layer 12 is a layer which consists of hardened | cured material of the specific thermosetting urethane composition containing a polyol component, an isocyanate component, and a crosslinking agent.

Hereinafter, the structural member of the stripping roll of this invention is demonstrated.

As the core member, the same core member as that used in a conventionally known stripping roll can be used. As a material of the said core part, aluminum, stainless steel, iron, molybdenum, titanium, etc. are mentioned, for example.

Moreover, the shape and size of the said core material part are not specifically limited, either, What is necessary is just to set suitably according to the specification of the stripping machine which mounts a stripping roll similarly to a conventional product, and JIS standard (JIS B 9214: rubber strip for stripping).

The said rubber layer consists of hardened | cured material of the thermosetting urethane composition containing a polyol component, an isocyanate component, and a crosslinking agent. The thermosetting urethane composition contains TDI and / or MDI as the isocyanate component. Therefore, the said rubber layer has the outstanding durability, exhibits the outstanding effect that it is hard to thermally expand at the time of use, and is hard to discolor.

Conventionally well-known TDI can be used as said TDI (tolylene diisocyanate). In the TDI, the compounding ratio (2,4-TDI / 2,6-TDI) of 2,4-TDI and 2,6-TDI is not particularly limited, but 65/35 to 80/20 (weight ratio) is preferable. Examples of the TDI include T-80 (2,4-TDI / 2,6-TDI = 80/20), T-100 (2,4-TDI / 2,6-TDI = 100/0), and T. -65 (2,4-TDI / 2,6-TDI = 65/35) or the like can be used.

Of course, various commercial items can also be used as said TDI.

The said MDI (diphenylmethane diisocyanate or polymethylene polyphenylene polyisocyanate) is not specifically limited, It can use regardless of the optical narrowness of the molecular weight distribution. As said MDI, pure MDI (4,4'-MDI), a polymeric MDI, etc. can be used, for example.

Of course, various commercial items can also be used as said MDI.

It is preferable that the isocyanate group concentration in the said thermosetting urethane composition is 1.2 to 4.5 weight%.

When the said isocyanate group concentration is less than 1.2 weight%, the wear resistance of hardened | cured material may fall. On the other hand, when the said isocyanate group concentration exceeds 4.5 weight%, hardened | cured material may become a thing with too high hardness.

The said isocyanate group concentration (weight%) means the weight ratio of the isocyanate group contained in the total amount of an isocyanate component, a polyol component, and a crosslinking agent.

The polyol component is a polyester polyol. It is because the rubber layer excellent in abrasion resistance can be formed by the high intermolecular force expressed by the high polar polyester polyol group.

As said polyester polyol, what was obtained by reacting dicarboxylic acid and glycol according to a conventional method, etc. are mentioned, for example.

As said dicarboxylic acid, For example, aliphatic dicarboxylic acids, such as aromatic dicarboxylic acid, such as terephthalic acid, isophthalic acid, 2, 6- naphthalenedicarboxylic acid, adipic acid, azelaic acid, sebacic acid, Oxycarboxylic acids such as oxybenzoic acid, ester-forming derivatives thereof, and the like.

Among these, adipic acid is preferable, and adipic acid is particularly preferable when 1,4-butanediol is used as a glycol or a crosslinking agent. Since the C-atomic arrangement in adipic acid is the same quaternary arrangement as 1,4-butanediol, it is excellent in orientation crystallinity and has a strong crystallization structure, and expresses a strong intermolecular force. Adipic acid is also economical because it is inexpensive.

The said dicarboxylic acid may be used independently and may be used together 2 or more types.

Examples of the glycol include aliphatic glycols such as ethylene glycol, 1,4-butanediol, diethylene glycol, neopentyl glycol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, and triethylene glycol. And alicyclic glycols such as 1,4-cyclohexanedimethanol, aromatic diols such as p-xylenediol, polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and the like.

As said glycol, aliphatic glycol is preferable and ethylene glycol and 1, 4- butanediol are more preferable. It is inexpensive while being suitable for forming a rubber layer having a JIS-A hardness of about 90 °.

Although polyester polyol which is a reaction product of dicarboxylic acid and glycol is a linear structure, branched polyester using the trivalent or more ester formation component may be sufficient.

The said glycol may be used independently and may be used together 2 or more types.

Especially as said polyester polyol, polyethylene adipate type polyester polyol, polybutylene adipate type polyester polyol, and polyethylene butylene adipate type polyester polyol are preferable. It is inexpensive while having a molecular structure suitable for forming a rubber layer having a JIS-A hardness of about 90 °.

It is preferable that the number average molecular weights of the said polyol are 1000-3000. When the number average molecular weight is less than 1000, the rigidity may be high without expressing satisfactory rubber elasticity in the rubber layer. On the other hand, when a number average molecular weight exceeds 3000, satisfactory rubber strength may not be provided to a rubber layer, and it may become an excessively flexible rubber layer.

The said number average molecular weight is a measured value of polystyrene conversion by GPC (gel permeation chromatography) measurement.

The crosslinking agent is 1,4-butanediol (1,4-BD) and 1,4-bis (β-hydroxyethoxy) benzene (BHEB).

By using 1,4-BD and BHEB together as a crosslinking agent, the wear resistance of the rubber layer can be improved.

Moreover, when a crosslinking agent is 1, 4-BD and BHEB, it is easy to express suitable rubber hardness and rubber rigidity to the said rubber layer. Moreover, as a crosslinking agent, the thermosetting urethane composition containing 1, 4-BD and BHEB has a comparatively long pot life, and can also be shape | molded in water column shape.

It is preferable that the said thermosetting urethane composition contains a silicone oil further.

The rubber layer which consists of hardened | cured material of the thermosetting urethane composition containing a silicone oil becomes long, for the rubber coefficient becomes low, and its life becomes long. Moreover, when providing the said rubber layer, the sound (moving sound) at the time of detachment becomes small. When the rubber layer is provided, the surface of the stripping roll (surface of the rubber layer) is surrounded by the silicone oil due to the bleed of the silicone oil, thereby improving the water resistance (including storage).

It does not specifically limit as said silicone oil, For example, polydimethylsiloxane, its modified body, etc. can be used.

As for the viscosity of the said silicone oil, 20-1000 mPa * s (cps) are preferable.

When the viscosity of the said silicone oil is less than 20 mPa * s, the amount of the bleed of a silicone oil may become large too much. On the other hand, when it exceeds 1000 mPa * s, dispersibility may fall or it may not bleed.

In the said thermosetting urethane composition, 0.3-5 weight% is preferable with respect to the total amount of the said isocyanate component, the said polyol component, and the said crosslinking agent, and, as for content of the said silicone oil, 0.5-3 weight% is more preferable.

When content of the said silicone oil is less than 0.3 weight%, the effect which mix | blended silicone oil may not be fully acquired. On the other hand, when it exceeds 5 weight%, the surface of a rubber layer may become sticky, or the hardness and rubber property of a rubber layer may fall.

The thermosetting urethane composition may further contain a reaction aid such as a chain extender, a crosslinking accelerator or a crosslinking retardant, a hydrolysis inhibitor, reinforcing agents such as inorganic fibers or inorganic fillers, colorants, light stabilizers, heat stabilizers, antioxidants, You may contain various additives, such as an antifungal agent, a flame retardant, a filler (extender), etc. as needed.

It is preferable that JIS-A hardness in 20 degreeC of the said rubber layer (hardened | cured material of the said thermosetting urethane composition) is 85 degrees or more. When the said JIS-A hardness is less than 85 degrees, since the said rubber layer is too flexible, abrasion resistance may fall.

88 degrees or more are more preferable, and 90 degrees or more of the said JIS-A hardness are more preferable.

On the other hand, the JIS-A hardness at 20 ° C of the rubber layer is preferably less than 99 °. If it exceeds 99 °, the rice breaks during defrosting, and there is a fear that the occurrence rate of so-called waste is increased.

As for JIS-A hardness of the said rubber layer, when rice used as a depilation object is a relatively flexible japonicami etc., about 88-92 degrees is preferable. In addition, when the rice used for degreasing is relatively hard indikami etc., about 92-96 degrees is preferable.

What is necessary is just to measure the said JIS-A hardness based on JISK6225 (but measurement temperature is 20 degreeC).

In addition, the "rubber layer" in this invention is corresponded to the "rubber part" mentioned by JIS B 9124.

It is preferable that the peak temperature (Tg) of tan-delta is 10 degrees C or less of the said rubber layer (hardened | cured material of the said thermosetting urethane composition). It is because an appropriate rubber elasticity is expressed at 30-50 degreeC which is the temperature of the rubber layer at the time of use.

It is preferable that DIN wear loss of the said rubber layer (hardened | cured material of the said thermosetting urethane composition) is 60-100 Pa.

When the said DIN wear loss is less than 60 microseconds, the occurrence rate of waste may increase at the time of detachment. On the other hand, when the DIN wear loss exceeds 100 kPa, the durability of the rubber layer becomes insufficient.

What is necessary is just to measure the said DIN wear loss based on the DIN abrasion test of JISK6264.

The thickness of the said rubber layer is not specifically limited, What is necessary is just to set suitably according to the specification of the stripping machine which mounts a stripping roll similarly to a conventional product, and JIS standard (JIS B 9214).

The thickness (shown as T in FIG. 1B) of the rubber layer refers to a value of 1/2 of the difference between the outer diameter and the inner diameter of the rubber layer when not in use.

In the detachment roll of this invention, in order to improve the adhesiveness of the said core material part and the said rubber layer further, a primer layer and / or an adhesive layer are formed between them, or the adhesiveness with a rubber layer is improved on the outer peripheral surface of the said core material part. You may perform the surface treatment for this.

Formation of the said adhesive bond layer can be performed using a phenol type adhesive agent etc., for example.

Formation of the said primer layer can be performed using the urethane type, polyester type, silane type, polyamide type, phenol type primer, a silane coupling agent, etc., for example.

As said surface treatment, formation of a roughening surface etc. are mentioned, for example. The rough surface may be formed by, for example, a blast treatment, a grinding treatment, an etching treatment, a plating treatment, a polishing treatment, an oxidation treatment, or the like.

It is preferable that the roundness of the said detachment roll is 0.5 mm or less of a cut surface (cut surface perpendicular | vertical to the rotating shaft at the time of use). When the said roundness exceeds 0.5 mm, the deviation of the space | interval of stripping rolls at the time of use may become large, and stripping rate may fall or the occurrence rate of waste may increase.

Next, the manufacturing method of the stripping roll of this invention is demonstrated.

The said stripping roll can be manufactured by going through the process of following (1) and (2), for example.

(1) First, the core part is produced. The core member can be produced by a conventionally known method, and can be produced by, for example, aluminum die cast.

Then, an adhesive bond layer and / or a primer layer are formed in the outer peripheral surface of a core material part as needed, or surface treatment is given to the outer peripheral surface of a core material part.

(2) Next, a rubber layer is formed around the core member. Here, after placing a core material part in a cylindrical metal mold | die, the above-mentioned thermosetting urethane composition is inject | poured into the clearance gap between the outer peripheral surface of a core material part, and the inner wall surface of a metal mold | die. Then, a rubber layer is formed by hardening a thermosetting urethane composition on predetermined conditions.

At this time, the curing conditions of the thermosetting urethane composition are not specifically limited, What is necessary is just to set suitably according to the composition of the said thermosetting urethane composition. As said hardening conditions, the conditions which heat 30 to 90 minutes at 100-160 degreeC can be employ | adopted normally.

Moreover, after hardening process on the said conditions and demolding a hardened | cured material from a metal mold | die, you may perform postcure on the conditions of 3 to 48 hours at 100-160 degreeC, for example.

By using such a method, by laminating a rubber layer on the outer circumferential surface of the core member portion, it is possible to manufacture a detachment roll having a rubber layer having a uniform density throughout.

The thermosetting urethane composition used by this invention is because progress of hardening after preparation is comparatively slow.

In the manufacturing method of the said detachment roll, you may form the surface of a rubber layer by grinding processing as needed. Of course, it is not necessary to perform the said grinding process, demolding from a metal mold | die.

Next, the usage method of the stripping roll of this invention is demonstrated.

It is a schematic diagram for demonstrating the use method of the stripping roll of this invention.

The stripping roll of this invention uses two stripping rolls as one set, and is attached to a conventionally well-known rubber roll type stripper and used.

That is, as shown in FIG. 2, a pair of stripping rolls 10A and 10B are mounted in parallel so as to have a predetermined distance L, and each of the stripping rolls 10A and 10B is opposite to each other and has a different rotation speed. It rotates at the rotational speed Va of the stripping roll 10A ≠ the rotational speed Vb of the stripping roll 10B. When rice 1 is thrown in between the stripping rolls 10A and 10B in this state, rice hulls are stripped from rice 1 by the circumferential speed difference of stripping roll 10A and stripping roll 10B.

The distance L between the gap between the stripping roll 10A and the stripping roll 10B and the rotational speed (main speed) of each of the stripping roll 10A and the stripping roll 10B when the stripping roll is used (Va). And Vb) are not particularly limited and may be appropriately set in accordance with various conditions such as the specification of the deaeration machine, the type and drying rate of the rice to be added, the treatment rate, and the deaeration rate.

Example

Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.

1. Preparation of thermosetting urethane composition

(Preparation Example 1)

100 parts by weight of a urethane prepolymer (sanprene P6814, manufactured by Sanyo Kasei Co., Ltd.), silicone oil (manufactured by Toray Dow Corning Co., SH-200) using MDI as an isocyanate component and polyethylene adipate ester diol (PEA) as a polyol component. 100 mPas)) 1.0 part by weight, 0.02 part by weight of a yellow pigment (ZA yellow # 200, manufactured by Mikuni Kagaku Co., Ltd.), and 0.02 part by weight of a white pigment (ZA white # 2200, manufactured by Mikuni Kagaku Co., Ltd.) Mix with a stirrer. Next, 1.59 weight part of 1, 4- butanediol (made by BASF Japan) and 10.50 weight part of BHEB (made by Mitsui Chemicals) were further mixed with the obtained mixture, and the thermosetting urethane composition A was prepared.

(Preparation Example 2)

100 weight part of urethane prepolymers (San P6814, Sanyo Kasei Co., Ltd.), 0.02 weight part of yellow pigments (ZA yellow # 200), and 0.02 weight part of white pigments (ZA white # 2200) were mixed with the stirrer. Next, 1.59 weight part of 1, 4- butanediol (made by BASF Japan) and 10.50 weight part of BHEB (made by Mitsui Chemicals) were further mixed with the obtained mixture, and the thermosetting urethane composition B was prepared.

(Preparation Example 3)

A thermosetting urethane composition C was prepared in the same manner as in Preparation Example 2 except that the mixing amount of 1,4-butanediol was 6.56 parts by weight and BHEB was not mixed.

(Preparation Example 4)

A thermosetting urethane composition D was prepared in the same manner as in Preparation Example 2, except that 1,4-butanediol was not mixed and the mixed amount of BHEB was 14.37 parts by weight.

(Preparation Example 5)

A thermosetting urethane composition E was prepared in the same manner as in Preparation Example 1 except that the mixed amount of 1,4-butanediol was 6.56 parts by weight and BHEB was not mixed.

(Preparation Example 6)

Polyethylene adipate ester diol (PEA) (bulcoran 2000MM, Sumitomo Bayer Urethane Sha) 100 parts by weight, NDI (Death Module 15, Sumitomo Bayer Urethane Sha) 25 parts by weight, silicone oil (SH-200 (100 mPas) ) 1.0 weight part, 0.02 weight part of yellow pigments (ZA yellow # 200), and 0.02 weight part of white pigments (ZA white # 2200) were mixed with the stirrer. Next, 5.0 weight part of 1, 4- butanediol (made by BASF Japan) was further mixed with the obtained mixture, and the thermosetting urethane composition F was prepared.

2. Fabrication and Evaluation of Stripping Roll (1)

(Example 1)

In the present Example, the form: large 60 detachment roll was produced.

First, the core material part of the shape shown in FIG. 1 was cast by aluminum die casting.

Next, in the cylindrical die, the core portion was provided so that the interval between the outer circumferential surface of the core portion and the inner circumferential surface of the mold was almost equally spaced over the entire circumference.

Thereafter, the thermosetting urethane composition A is injected into the gap between the outer circumferential surface of the core portion and the inner circumferential surface of the mold, and cured under the following conditions. Produced detachment roll.

(Curing condition)

The temperature of the thermosetting urethane composition A at the time of injection was made into 105 degreeC, and it hardened | cured for 60 minutes at 130 degreeC of die temperature.

Then, it demolded from the metal mold | die and post-cured on 110 degreeC and the conditions of 24 hours.

(Example 2)

A desorption roll was produced like Example 1 except having used the thermosetting urethane composition B instead of the thermosetting urethane composition A.

(Comparative Example 1)

A desorption roll was produced like Example 1 except having used the thermosetting urethane composition C instead of the thermosetting urethane composition A.

(Comparative Example 2)

A desorption roll was produced like Example 1 except having used the thermosetting urethane composition D instead of the thermosetting urethane composition A.

(Comparative Example 3)

A desorption roll was produced like Example 1 except having used the thermosetting urethane composition E instead of the thermosetting urethane composition A.

(Comparative Example 4)

A desorption roll was produced like Example 1 except having hardened | cured on the following conditions using the thermosetting urethane composition F instead of the thermosetting urethane composition A.

(Curing condition)

The temperature of thermosetting urethane composition F at the time of injection | pouring was 125 degreeC, and it hardened | cured for 60 minutes at 130 degreeC of die temperature.

Then, it demolded from the metal mold | die and post-cured on 110 degreeC and the conditions of 24 hours.

(Comparative Example 5)

The detachment roll (white roll, unified large 60 type | mold) of the Peninsula Kagakusha product was made into the detachment roll of this comparative example. Moreover, the said white roll is a detachment roll provided with the rubber layer which has SBR as a main component.

(Comparative Example 6)

The detachment roll (red roll, unification vs. 60 type | mold) of the Peninsula Kagakusha make it the detachment roll of this comparative example. Moreover, the said red roll is a stripping roll provided with the rubber layer which has SBR as a main component.

(evaluation)

(1) Relationship between the size of the stripping roll and the temperature

About the stripping roll of an Example and a comparative example, after leaving for 2 hours at each temperature of 20 degreeC, 45 degreeC, and 70 degreeC, the one side thickness of each stripping roll was measured.

Here, leaving for 2 hours under 45 degreeC and 70 degreeC was performed by storing for 2 hours in oven set to each temperature.

In the measurement of one-side thickness, three dimensions from the inner surface of the core member to the surface of the rubber layer were measured using a digital centrifuge of 20 cm, and the average value was taken as the one-side thickness.

Moreover, in each stripping roll, the ratio of the one side thickness in 45 degreeC and 70 degreeC with respect to the one side thickness of 20 degreeC was computed as the one side thickness measured at 20 degreeC as "100". The results are shown in Table 1.

(2) JIS-A hardness

JIS-A hardness of the rubber layer formed in the stripping roll of an Example and a comparative example was measured based on JISK61253. However, the measurement temperature was 20 degreeC and the measurement part was three places. The results are shown in Table 1.

(3) DIN wear loss

The loss of DIN wear of the rubber layer formed on the stripping roll of an Example and a comparative example was evaluated.

Evaluation of the said DIN wear loss produced the test piece (diameter 16 mm x thickness 6 mm) of the same composition as the said rubber layer separately, and using this test piece, by the method based on JISK6264, rotation of a test piece: none ( Method A) and the additional force of the test piece: It carried out at 10N. The results are shown in Table 1.

(4) peak temperature (Tg) of tanδ

The peak temperature (Tg) of tan-delta of the rubber layer formed in the stripping roll of Example 1, 2 and Comparative Examples 4-6 was evaluated.

Evaluation of the peak temperature of said tan-delta produced the test piece (3 mm in width x 40 mm in length x thickness 1mm) of the same composition as the said rubber layer separately, and was made to Leofector-DVE-V4 (Rheological Co., Ltd. product). 5% of static distortion and 10 Hz sine wave tension excitation were measured in 60-100 degreeC of temperature range. The temperature at which loss coefficient tan-delta shows the maximum value was made into the peak temperature of tan-delta.

(5) color tone change (with or without color change)

The color tone change of the rubber layer formed in the stripping roll of an Example and a comparative example was evaluated.

Evaluation of the said hue change produces the test piece (size: 200 mm in length x 70 mm in width x thickness 2mm) of the same composition as the said rubber layer separately, and uses the sunshine weather meter (Suga Shikenki Co., Ltd. product, the sunshine weather meter S80). ), The test piece was exposed to the conditions specified in the accelerated weather resistance test of JIS K 6732 for 120 hours, and then a change in color tone was observed. The results are shown in Table 1.

As shown in Table 1, the stripping roll of the present invention having a rubber layer made of a cured product of a specific thermosetting urethane composition is difficult to expand at the time of use, and has the same dimensional stability as a commercially available product which has already been established in the market with reliability. have.

Moreover, it became clear that the wear resistance of a rubber layer improves by using 1, 4-BD and BHEB together as a crosslinking agent.

Moreover, it became clear that the stripping roll of this invention does not discolor at the time of storage.

3. Fabrication and Evaluation of Stripping Roll (2)

(Example 3)

In the present Example, the stripping roll of type | mold: large 100 was produced.

Here, the removal roll was produced using the method similar to Example 1 except having changed the shape and the dimension.

(Example 4)

A desorption roll was produced like Example 3 except having used the thermosetting urethane composition B instead of the thermosetting urethane composition A.

(Comparative Example 7)

A desorption roll was produced like Example 3 except having used the thermosetting urethane composition C instead of the thermosetting urethane composition A.

(Comparative Example 8)

The stripping roll (white roll, unified large 100 type | mold) of the peninsula Kagakusha made it the stripping roll of this comparative example.

(evaluation)

(6) Performance evaluation of the stripping roll

In three facilities described later, the relationship between the amount of stripping and the amount of wear of the rubber layer was evaluated.

In addition, in the Toyooka country elevator, the hearing investigation was performed about the past results regarding the service life of a commercial stripping roll.

(6-1) Evaluation of the stripping rolls produced in Examples 3 and 4

We evaluated in Tajima agriculture cooperative, Toyooka country elevator.

The deaeration machine used Satakesha product, model: HA10NC (introduced in 2004).

Rice was an item: non-glutinous rice, moisture content (based on brown rice) 14.3 to 14.8%, and the charged rice temperature was 5 to 15 ° C.

The processing speed was about 4.6 ton / hour.

In addition, the stripping rate in the case of using the stripping roll of Example 3 was 78%, and the stripping rate in the case of using the stripping roll of Example 4 was 79%.

In this evaluation, about 300 tons of rice was processed and the abrasion amount of the rubber layer of the stripping roll at that time was measured. At this time, the amount of abrasion was calculated by making the difference between the thickness of the initial rubber layer (25 mm) by measuring the thickness of the remaining rubber layer by placing a ruler on each end face of the pair of stripping rolls (main roll and sub roll). The results are shown in Table 2.

In addition, in Table 2, the amount of abrasion before the main roll and the front roll means the amount of abrasion measured at the cross section located in front when the demounting roll is attached to the demounting machine. Refers to the amount of wear measured at the cross section located inside when attached.

Moreover, based on the measurement result of the said abrasion amount, the estimated limit detachment amount (expected value of the weight of detachable rice) when the stripping roll was used until the service life (until the thickness of the rubber layer becomes 5 mm) was calculated. . The results are shown in Table 2.

In addition, the estimated limit stripping amount calculates an average value (average abrasion amount) of the four abrasion amounts measured by the method mentioned above, and is based on the average abrasion amount (A) and the weight (B) of the rice actually processed below. It calculated from (1).

Expected limit stripping amount = weight of rice (B) ÷ [mean wear amount (A) / 20] ... (1)

Moreover, as a result of the listening investigation in the Toyooka Country Elevator, it became clear that the life (limit removal amount) of the stripping roll (white roll, unification vs. 100 type) of the Peninsula Kagakusha product is approximately 300-400 tons.

(6-2) Evaluation of the detachment roll produced in the comparative example 7

We evaluated in Tajima agriculture cooperative, Izu City country elevator.

The deaeration machine used the Satake product, model: HPS100HEA (introduced in 1999). In addition, rice was made into the item: Hinohikari, moisture content (a brown rice standard) 14.5-16.3%, and charged rice temperature 15-28 degreeC.

The processing speed was about 2.5 tons / hour.

In addition, the removal rate in Comparative Example 7 was 79%.

In this evaluation, about 220 tons of rice was processed and the abrasion amount of the rubber layer of the stripping roll at that time was measured. The results are shown in Table 2.

Moreover, the anticipated limit detachment amount was computed based on the measurement result of the said wear amount. The calculation results are shown in Table 2.

In addition, the measuring method of abrasion amount and the calculation method of anticipated limit removal amount are the same as said (6-1).

(6-3) Evaluation of the stripping roll produced in Comparative Example 8

We evaluated in Hyogo Minami agriculture cooperative, Inami country elevator.

The deaeration machine used Satakesha product, model: HPS100HEA (introduced in 1999).

Rice was made into items: Hinohikari and Kinuhikari, moisture content (based on brown rice): 14.3% (Hinohikari) and 14.1% (Kinuhikari).

The processing speed was about 2.0 tons / hour.

In addition, the removal rate in the case of using the stripping roll of the comparative example 8 was about the same as the case of using the conventional stripping roll.

In this evaluation, about 350 tons of rice was processed and the abrasion amount of the rubber layer of the stripping roll at that time was measured. The results are shown in Table 2.

Moreover, the anticipated limit detachment amount was computed based on the measurement result of the said wear amount. The calculation results are shown in Table 2.

In addition, the measuring method of abrasion amount and the calculation method of anticipated limit removal amount are the same as said (6-1). However, in Comparative Example 8, the amount of wear was measured only at two places in front of the main roll and the front roll.

As shown in Table 2, the stripping roll of this invention provided with the rubber layer which consists of hardened | cured material of a specific thermosetting urethane composition can be used for a long time because it is excellent in durability, and the exchange frequency of a stripping roll can be reduced.

Moreover, when the said thermosetting urethane composition contains silicone oil, it became clear also that durability improves.

10, 10A, 10B: Stripping roll
11: Heartwood
11a: mounting flange
12: rubber layer

Claims (4)

A detachment roll provided with a core material part and the rubber layer laminated | stacked on the outer peripheral surface of the said core material part,
The said rubber layer consists of hardened | cured material of the thermosetting urethane composition containing a polyol component, an isocyanate component, a silicone oil, and a crosslinking agent,
The polyol component is a polyester polyol,
The isocyanate component is TDI, MDI, or the TDI and MDI,
The crosslinking agent is 1,4-butanediol and 1,4-bis (β-hydroxyethoxy) benzene,
In the said thermosetting urethane composition, content of the said silicone oil is 0.3-3 weight% with respect to the total amount of the said isocyanate component, the said polyol component, and the said crosslinking agent, The stripping roll characterized by the above-mentioned. The method of claim 1,
The dewaxing roll, wherein the isocyanate component is MDI. The method according to claim 1 or 2,
The said rubber layer is stripping roll whose JIS-A hardness in 20 degreeC is 85 degreeC or more and less than 99 degrees. The method according to claim 1 or 2,
The rubber layer has a DIN wear loss of 60 ~ 100㎣, stripping roll.

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