JP2008144109A - Core for winding up sheet or film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core for winding up a sheet or film, which effectively utilizes a rice-blended polyolefin resin composition developed to aim at the effective utilization of the surplus rice and prepared by uniformly blending the raw rice as gelatinized rice into a polyolefin resin and which, using this, has excellent features in both performances and manufacturing aspects. <P>SOLUTION: The core for taking up a sheet or film is manufactured by using the rice-blended polyolefin resin composition prepared by kneading a polyolefin resin (A), an α-rice (gelatinized rice) (B) and a compatibilizer (C) to improve the affinity in the interface between the above (A) and (B) at a temperature where the polyolefin resin causes a thermal flow and by finely and uniformly dispersing the rice component into the matrix of the polyolefin resin (A). In its manufacturing process, dust is hardly generated, adherence of the dust to the product core is little, and thus the core can be produced in the clean environment. The winding of the sheet or film around the product core is excellent and the utilization of the roll after the winding is excellent. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cylindrical core member for winding a sheet or film. More specifically, the present invention relates to a cylindrical core member (hereinafter simply referred to as a core) obtained by molding a rice-containing polyolefin resin composition containing polyolefin resin and pregelatinized rice, and particularly electronic materials, pharmaceutical packaging, and special labels. The present invention relates to a core suitable for winding a sheet or film for food packaging.

2. Description of the Related Art Conventionally, sheets and films used for packaging foods, medical products, machinery, electronic materials and the like are wound around a core and provided as a roll product on the market. As a core for such a product, a paper tube manufactured from paper (pulp) as a raw material has been known for a long time.
Paper tubes have been widely used as cores for textile products such as cloth, nonwoven fabrics, paper, films, sheets and the like. However, the sheet and film wound around the core have improved their performance and quality, and the objects to which they are applied have advanced to highly functional materials, and the core itself has become an appropriate material for these materials. Is forced to change. The impact on the environment, such as the recycling and disposal of cores, is also a major shift factor.

In the background of having to change the core material from paper to other materials, paper tubes that have been used as cores in the past have problems such as penetration of dust and moisture, propagation of germs, and deviations in control dimensions. It was.
In order to solve these problems, resin has been used as a core material.
As the resin, vinyl chloride resin, ABS resin, PE, PP and other thermoplastic resins are used. Each of these resin cores has advantages and disadvantages, and is currently properly used depending on the application. For example, these cores are said to have the following problems.
That is, the core made of vinyl chloride resin has a problem that it is difficult to incinerate or to recycle the raw material resin because the treatment after use may generate dioxin.
Also, with cores made of ABS resin or PE resin, the problems of paper and vinyl chloride cores are eliminated, and sheets and films can be wound around the core in a clean environment. It is effectively used as a product that can be applied to fields where work in a clean environment such as electronic materials is desired.
However, using these resin materials, in the process of extruding the core and cutting the molded product into a product, dust is generated, and the scattered dust adheres to the core. In order to remove it, antistatic work and cleaning work are carefully carried out.
That is, although the disadvantage of the paper tube is eliminated, the use of the resin core having the above-mentioned problems may cause problems when a product wound with a sheet or film is applied to the field of electronic materials or pharmaceuticals. is there.

As described above, the core for winding a sheet or film using a conventionally known paper or resin as a material has the above-mentioned problems, and a core having excellent aptitude and solving these problems is required. ing. Under such circumstances, a rice-blended polyolefin resin composition has been proposed for the purpose of effectively utilizing surplus rice (Japanese Patent Laid-Open No. 2005-330402). Raw rice is alpha-blended and blended into a polyolefin resin to be uniformly blended to obtain a moldable rice-blended polyolefin resin composition. However, although the composition and its production method, film molded product and molding method are disclosed, it is used as a material for a core for winding a sheet or film, has excellent characteristics in its production process, and has excellent core itself. The characteristics and applicability are not disclosed.
JP-A-2005-330402

An object of the present invention is to provide a core for winding a sheet or a film, which has appropriate physical and mechanical properties, has no water penetration like a paper tube, and does not propagate bacteria, and has a vinyl chloride core. Provides a resin core that eliminates problems such as difficulties in recycling and the difficulty of manufacturing in a clean environment due to dust generation and dust adhesion during core manufacturing. It is to be.
Moreover, it is providing the core suitable for winding up the sheet | seat or film applied to field | areas, such as an electronic material, pharmaceutical packaging, a special label, and food packaging.

The present inventor has intensively studied to solve the above-mentioned problems, and as a result, in the process of producing a core by molding a rice-blended polyolefin resin composition containing a pregelatinized rice and a polyolefin resin obtained by alpha-izing rice, It has been found that the amount of dust scattered when cutting the core is small, and it is difficult to adhere to the core with fine dust, and even if it adheres, it can be easily removed, and the present invention has been completed.
That is, the present invention
1. 20-95 parts by weight of polyolefin resin (A), 80-5 parts by weight of pregelatinized rice (B), and a compatibilizing agent (C) for improving the affinity at the interface between the polyolefin resin (A) and pregelatinized rice (B) A rice-blended polyolefin resin composition obtained by kneading 0.2 to 20 parts by weight with respect to a total of 100 parts by weight of the components (A) and (B) at a temperature at which the polyolefin resin (A) is thermally fluidized. A core characterized by molding,
2. The core according to 1, wherein the pregelatinized rice (B) is obtained by adding water to brown rice or polished rice and heating to gelatinize the rice,
3. The core according to claim 1, wherein the pregelatinized rice (B) is dehydrated after adding moisture to brown rice or polished rice, heating to gelatinize,
4). The core according to 2 or 3, wherein the water is dissolved in at least one of salt, sucrose, trehalose, antioxidant, protein degradation accelerator, and cellulose degradation accelerator,
5. The core according to 1, wherein the compatibilizer (C) is a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof,
6). The core according to 1, wherein the polyolefin resin (A) is added with an additive that imparts biodegradability,
It is.

The core of the present invention has appropriate physical and mechanical properties as a core for winding a sheet or film, and does not penetrate moisture and propagate bacteria like a paper tube. Like, there is no problem in recycling use and disposal after use. In addition, since the generation and adhesion of dust during production of the core is small, it is possible to reduce the process of static elimination and cleaning for removing the adhered dust, and the core can be produced in a clean environment and with a shortened production process. Moreover, the roll which wound the sheet | seat and film around this core has the outstanding applicability as an electronic material, a pharmaceutical packaging, a special label, and food packaging.
On the other hand, in a rice compounded polyolefin resin composition containing pregelatinized rice and olefin resin used as a raw material for the core, pregelatinized rice is produced for food and is now in an excessive supply state in Japan, increasing year by year. Surplus rice can be used as a raw material.
Therefore, the core of the present invention using a rice-blended polyolefin resin composition as a raw material is used to effectively utilize surplus rice other than food and compress its inventory if its application expands as various physical properties are excellent. It is extremely effective as a use.
In addition, since the core of the present invention uses such a resin material as a raw material, its physical and mechanical performance is good, and it can be reused repeatedly.For example, even if it is incinerated, its burning calories are small. In addition, it responds to global environmental problems such as the generation of no toxic gas, and its usefulness as a core is high.

The present invention will be described in detail below.
In the core of the present invention, the polyolefin resin (A) used in the raw material rice-blended polyolefin resin composition is low density polyethylene (HPPE), high density polyethylene (HDPE), polypropylene (PP), or ethylene-vinyl acetate. Examples thereof include ethylene-based copolymers such as a polymer (EVA) and an ethylene-ethyl acrylate copolymer (EEA). Moreover, these polyolefin resins can also be used 1 type or in mixture of 2 or more types.

The pregelatinized rice (B) blended in these polyolefin resins (A) is obtained by subjecting raw rice such as brown rice or polished rice to pregelatinization.
Polyolefin resins have poor affinity with raw rice, and it is difficult to obtain a rice-blended polyolefin resin composition in which blended rice is finely and uniformly mixed in a polyolefin matrix. For this reason, even if the conventional rice-blended polyolefin resin composition is heat-fluidized to obtain a film molded product by stretching, the polyolefin resin matrix of this film molded product contains a blended rice powder having a large particle size. Is unevenly distributed, the film thickness of the resulting film molded product is non-uniform, cracks occur during stretching, there is a limit to thinning, and the mechanical properties of the film after molding are marked It is inferior, and a high-quality film molded product cannot be obtained.

Normally, raw rice has a water content of about 13% by weight by itself, and when the water content is further increased and placed in a temperature environment of 70 ° C. or higher, the initial crystal structure of starch constituting the raw rice ( (β structure) breaks down to have an amorphous structure (α structure). Thus, when starch contains moisture and changes from β structure to α structure (referred to as gelatinization), raw rice changes from a hard state to a pasty gel state. However, starch that has changed to α structure is allowed to cool again while containing moisture from a temperature environment of 70 ° C. or higher, and when it is left at a low temperature, it returns to the hard state of the original β structure over time (aging). Phenomenon). However, if the raw rice β starch is changed to α starch as described above and then rapidly dried under reduced pressure at a high temperature, aging to β structure is suppressed in a low temperature environment.
In the rice-containing polyolefin resin composition according to the present invention, since the pregelatinized rice (B) has a good compatibility with the polyolefin resin, the β-starch of raw rice is changed to α-starch as described above, and then the Under reduced pressure, it is rapidly dried under reduced pressure to remove water, and kneaded with polyolefin resin as pregelatinized rice in which starch does not return to β structure.
Or, mix raw rice with polyolefin resin, heat and knead, change β starch constituting raw rice to α starch to give compatibility with polyolefin resin, and make into α starch without returning to β starch A polyolefin resin containing rice can also be used.
In this rice-containing polyolefin resin composition according to the present invention, as described above, pregelatinized rice means that the starch having the β structure of raw rice is changed to the starch having the α structure and does not return to the original starch having the β structure. Say the state of rice.

In the rice-blended polyolefin resin composition used in the present invention, pregelatinized rice (B) is blended with the polyolefin resin by the following method. Examples of the method include the following methods (I) and (II).
First, (I) the raw rice is pregelatinized as described above, and the dehydrated pregelatinized rice (B) is blended with the polyolefin resin.
In this method, raw rice is gelatinized in a temperature environment of 70 to 80 ° C. or higher in the presence of water (α-treatment), and then the atmosphere is reduced by a vacuum apparatus as it is, and dehydrated and dried to obtain α-rice. .
Specifically, the treatment to make the β structure of the starch of raw rice into α structure is performed by soaking the raw rice by boiling the raw rice in water or steaming the raw rice with steam. Can do. Therefore, in such a treatment, the treatment of immersing raw rice in water is to immerse raw rice, which originally has a moisture content of about 13%, in water for about 5 to 20 minutes, and then sufficiently drain the water. In general, the moisture content should be at least about 17%.
By such a treatment, if the starch having a β structure of raw rice is changed to an α structure starch, and then water is removed at a high temperature, for example, the structure of the starch is α Since it does not reversibly transition to the β structure while maintaining the structure, it can be used as a material for the rice-blended polyolefin resin composition according to the present invention. That is, the dehydrated pregelatinized rice (B) can be stored for a long period of time as a single pregelatinized rice (B) without converting the αstarch into βstarch, and can be directly incorporated into a polyolefin resin. Therefore, this method contributes to shortening the production period and reducing the production cost of the rice-blended polyolefin resin composition.

In addition, when preparing the rice-blended polyolefin resin composition, the pregelatinized rice (B) contains water or does not contain water (dehydrated) if the starch has an α structure (amorphous structure). ) Any state.
If the starch structure of the blended rice blended with the polyolefin resin (A) is an α structure (amorphous structure), the polyolefin resin (A) and the pregelatinized rice (B) are kneaded with the polyolefin resin (A). The starch molecular chains are loosened in the matrix, and become finer and more easily dispersed. This is an effect that cannot be obtained when raw rice having a β structure (crystal structure) as the starch structure is blended as it is. Note that the raw rice subjected to the pregelatinization treatment may be in the form of brown rice or polished rice, and may be pulverized, or may be used old or old rice or waste rice at low prices.

When the raw rice is pregelatinized, the water to be immersed in the salt, sucrose, trehalose, antioxidant, which has the effect of suppressing deterioration over time of the rice components blended in the rice-blended polyolefin resin composition, At least one of a protein degradation accelerator and a cellulose degradation accelerator may be added.
Among these, trehalose is preferably added because it can suppress the decomposition of the lipid component of rice. That is, fresh rice is further impregnated with an aqueous solution in which trehalose is dissolved.
Trehalose can suppress degradation of the lipid component of rice and suppress deterioration over time of the produced rice-containing polyolefin resin composition. This is because trehalose protects fatty acids from oxidative degradation by coating rice components and interacting with unsaturated double bond moieties where fatty acids are susceptible to alteration.
Moreover, by adding these things, the effect of preventing the characteristic odor, scorching, and coloring by mix | blending rice is also acquired.

Next, (II) water-treated raw rice (B ′) is directly blended into the polyolefin resin (A) and kneaded at the heat flow temperature of the polyolefin resin to convert the raw rice β starch into α starch and at the same time polyolefin It is a method of making it compatible with resin.
The method of (I) above is a method of using pregelatinized rice that has already undergone pregelatinization as the blended rice blended with the polyolefin resin (A). On the other hand, the method (II) is a method of directly blending raw rice that has been subjected to water treatment, and blending raw rice (B ′) with a polyolefin resin, and at the time of melt kneading, raw rice (B ′) Β starch is changed to α starch, which is finely dispersed in a polyolefin resin. Also by this method, the rice compounded polyolefin resin composition used in the present invention can be obtained.

In this method, raw rice is dipped in water for a predetermined time, drained and subjected to water treatment so as to contain predetermined moisture, and a kneading machine together with the polyolefin resin (A) and other additives as necessary. And kneaded at the heat flow temperature of the polyolefin resin (A). This heat flow temperature (usually 100 to 200 ° C.) is sufficient to transfer the starch structure of the raw rice from the β structure to the α structure. Become rice. By such a method, the raw rice is changed into pregelatinized rice, the molecular chain of starch is loosened, the rice component is refined, and a rice blended polyolefin resin composition dispersed in the polyolefin resin (A) matrix is obtained. .
In the kneading process of the raw rice (B ′) and the polyolefin resin, the water content necessary for the raw rice (B ′) to be pregelatinized is 17% or more. Therefore, the water treatment of raw rice (B ′) performed prior to the kneading process usually has a water content of about 13%, so that the immersion time in water is used to obtain the above water content. Must be at least 5 minutes.
In addition, in the water treatment, at least one of trehalose, salt, sucrose, antioxidant, protein degradation accelerator, cellulose degradation accelerator and the like is added to the water in which raw rice is immersed, as in the method (I) above. May be.

The rice-blended polyolefin resin composition used in the present invention comprises 20 to 95 parts by weight of polyolefin resin (A), 80 to 5 parts by weight of pregelatinized rice (B), and polyolefin resin (A) and pregelatinized rice (B). The compatibilizing agent (C) for improving the affinity at the interface contains 0.2 to 20 parts by weight with respect to 100 parts by weight as a total of the components (A) and (B).
That is, in the rice blended polyolefin resin composition, in the method (I), the blended amount of the pregelatinized rice (B) is 100 parts by weight in total of the polyolefin resin (A) and the pregelatinized rice (B). 5 to 80 parts by weight. If it is less than 5 parts by weight, the desired effect of suppressing heat generation cannot be obtained during incineration. Moreover, when it exceeds 80 weight part, the feel of a molded article is inferior.
In addition, in the method (II), the blending amount of raw rice (B ′) in the method (II) is 100% by weight of the total of the polyolefin resin (A) and raw rice (B ′). It is 5 to 80 parts by weight in terms of dry matter of rice. If it is less than 5 parts by weight, the moisture absorbed in the raw rice (B ′) will diffuse into the polyolefin resin (A) during the kneading, and the substantial amount of the raw rice (B ′) This is because the moisture content is 17% or less. Moreover, when it exceeds 80 weight part, the matrix of a rice mixing polyolefin resin composition will be formed with a mixing | blending rice, for example, when a film is shape | molded, the desired texture as a film is not obtained.

  The compatibilizing agent (C) used in the rice-blended polyolefin resin composition used in the present invention improves the affinity between the surface of the polyolefin resin and the pregelatinized rice. As such a compatibilizing agent, a saturated carboxylic acid, an unsaturated carboxylic acid or a derivative thereof is used, and examples of the saturated carboxylic acid include succinic anhydride, succinic acid, phthalic anhydride, phthalic acid, tetrahydrophthalic anhydride, adipine anhydride Examples of the unsaturated carboxylic acid include maleic acid, maleic anhydride, nadic anhydride, itaconic acid, itaconic anhydride, citraconic acid, citraconic anhydride, sorbic acid, and acrylic acid. As the derivative of the unsaturated carboxylic acid, a metal salt, amide, imide, ester or the like of the unsaturated carboxylic acid can be used. Further, a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof can be used. This can be obtained by heating and mixing a polyolefin, an unsaturated carboxylic acid or derivative thereof, and a radical generator in the presence or absence of a solvent. The addition amount of the unsaturated carboxylic acid or derivative thereof is preferably 0.1 to 15% by weight, particularly 1 to 10% by weight.

The compatibilizer (C) is preferably a polyolefin resin modified with an unsaturated carboxylic acid or derivative thereof having no odor and low acidity.
This compatibilizing agent (C) is in the range of 0.2 to 20 parts by weight with respect to 100 parts by weight as a total of the components (A) and (B) or (B ′).

  In addition, the biodegradability improves the rice mixing polyolefin resin composition used by this invention, so that the mixture ratio of mixing rice increases. However, if necessary, an additive that imparts biodegradability to the polyolefin resin itself, which is a matrix component, may be added. Specific examples of such additives include an oxidation catalyst (for example, Tegranobon (trademark), etc.) that decomposes by an auto-oxidation catalytic action based on the action of microorganisms, ultraviolet rays, and temperature. With these additives, when the matrix component polyolefin is discarded, the bond between carbon and carbon is cut off by direct action, and it is decomposed by oxidative degradation in a short time, and finally into water and carbon dioxide. Become.

The means for imparting biodegradability to the rice-blended polyolefin resin composition is not limited to the oxidation catalyst additive as described above, and is limited to the decomposition mechanism as long as it has a function of decomposing the polyolefin resin. It can be used without being used.
As an additive that shows other mechanisms for decomposing the main component resin, for example, an enzyme that activates the activity of microorganisms that decompose the main component resin, or that makes the main component resin easily decomposed by the microorganism, is blended Microbial degradation additives that have been prepared. Specifically, there is an ECM masterbatch (trade name) of Macrotech Research (USA).

The rice-blended polyolefin resin composition used in the present invention can be produced by the following method.
That is, the polyolefin resin (A), pregelatinized rice (B) (or raw rice (B ′) having a water content of 17% or more), a compatibilizing agent (C), and other added as necessary Ingredients (biodegradability-imparting agent, etc.) are mixed in a desired amount within the range specified above, and this mixture is mixed at 130 to 200 ° C., preferably 150 to 190 ° C., for 20 seconds to 30 minutes, preferably 30. It can be manufactured by heating and kneading for 2 to 20 minutes.

  The apparatus used for heat kneading is not particularly limited as long as it can be kneaded under the above-mentioned conditions, and examples thereof include a blender, kneader, mixing roll, Banbury mixer, monoaxial or biaxial extruder. .

For example, each component is first charged directly into a hopper such as a twin-screw extruder by a weight feeder, and the set temperature of the kneading zone is set to the desired temperature with the twin-screw extruder and kneaded.
If the blended rice to be added is raw rice (B ′) having a water content of 17% or more, it is pregelatinized to become pregelatinized rice, and the molecular chains of starch are loosened in the matrix of the polyolefin resin (A). It diffuses, further improves the compatibility with the compatibilizer (C), and further improves the affinity for the polyolefin resin (A). As a result, the blended rice is refined in a matrix of the polyolefin resin composition (A) that is thermally fluidized, and a uniformly dispersed state is obtained. From this state, for example, if molded into a pellet shape and cooled to room temperature, the rice-blended polyolefin resin composition used in the present invention can be obtained.

  In addition, about the injection | throwing-in method to the hopper part of polyolefin resin (A), instead of adding all the amounts suddenly, you may divide | segment the amount in 2 steps. In this way, the total amount of the kneaded material in the first first step is reduced, so that the adhesion can be improved more efficiently. Next, if the remaining polyolefin resin (A) is charged in the second step, the rice component can be finely dispersed and uniformly dispersed in the polyolefin resin (A) matrix in a short time.

  As for the quantity of polyolefin resin (A) thrown in at this 1st step, it is desirable that the weight ratio with respect to a mixing | blending rice is 10 to 200%. If the lower limit is 10% or more, an action of suppressing reaggregation of the refined rice component in the presence of the polyolefin resin (A) can be expected, and the upper limit is 200%. If it is less than this, the effectiveness in terms of efficiency by sufficiently suppressing the total weight is exhibited.

The core of the present invention is obtained by molding a rice-blended polyolefin resin composition obtained by the above-described configuration and production method.
The resin molding method for obtaining the core of the present invention is not particularly limited as long as it is a method of molding a pipe using a thermoplastic resin as a material. For example, it can be preferably manufactured using an extrusion molding apparatus disposed on one line including a kneader, an extruder, a mold, a sizer, a cooling device, a take-up machine, a winder and a cutting machine as main apparatuses.
In the kneading machine (feed zone of a single screw extruder or the like), the rice-blended polyolefin resin composition produced by molding into pellets by the method (I) or (II) above is put into a hopper of a pipe molding apparatus. The required amount of each material used in the method (II) is charged into the hopper of the molding apparatus at a predetermined temperature in the kneader (feed zone of a single screw extruder, etc.) at the predetermined temperature. The core may be subsequently formed as a rice-blended polyolefin resin composition by melting and kneading uniformly with heating.
The melt-kneaded rice-blended polyolefin resin composition is extruded into a pipe shape from a mold laid on an extruder, and the extruded resin is immediately fed to a sizer, guided to a cooling molding apparatus by a take-out machine, and then cooled and molded. A pipe that has been cooled and solidified while adjusting the outer diameter, inner diameter, and thickness while passing through these can be obtained, and the long pipe can be cut into a predetermined length by a cutting machine to obtain a target core.

The excellent feature in the production of the core of the present invention is that, in addition to being able to form a pipe having good physical and mechanical performance, when cutting an extruded long pipe, chips generated at the time of cutting are dust. Therefore, there is no harm to the working environment at the molding site, and chips do not adhere to the pipe of the product, and even if there is dust adhering to the core, it can be easily removed.
Therefore, in the core manufacturing process, cutting into product dimensions can be performed in a clear working environment, the static electricity removal process can be reduced, and the cleaning process can be simplified, and both the inner and outer surfaces of the product are finished beautifully. Products can be provided. These features have the effect of preventing dust and dirt from adhering to the core even when packing the core.
Furthermore, since the surface resistance of the pipe is low, the charging property is small, and the generation of dust and static electricity is reduced, the work process of winding the sheet or film around the core of the present invention in a roll, and from the roll Sheets and films can be used without hindrance. In particular, the sheet or film wound around the core of the present invention can be suitably applied to the electronic equipment field.

Hereinafter, the present invention will be described in detail with reference to examples.
Production Example 1 (Production of Rice-Containing Polyolefin Resin Composition for Production of Core)
Polished rice containing 12.9% water (Echigo Sanae, produced in 1996) was immersed in tap water at 15 ° C. containing 1% by weight of trehalose (non-reducing carbohydrate, Hayashi Kagaku) for 2 hours. After soaking for 2 hours, centrifugal dewatering was performed for about 3 minutes to obtain soaked polished rice having a moisture content of 31.8%.
1. 77 parts by weight of low density polyethylene (Evolue SP2520: Mitsui Chemicals), 20 parts by weight of soaked polished rice in terms of raw rice, maleic acid-modified PP as a compatibilizer (Yumex 2000: manufactured by Sanyo Chemical Co., Ltd.) 2 parts by weight, and 0.8 part by weight of biodegradability imparting agent (MB pellets: Macrotech Research (US)) were kneaded for 3 minutes at a screw speed of 40 rpm and a cylinder temperature of 150 ° C., extruded, cooled, It cut into 2-5 mm, and obtained the pellet of the rice compounding polyolefin resin composition.

Example 1 (core obtained by molding a rice compounded polyolefin resin composition)
Using the pellets of the rice-blended polyolefin resin composition prepared in Production Example 1, the mixture was kneaded at 150 ° C. for 5 minutes using a twin screw extruder, extruded from the die, cooled, shaped, and outer diameter 89 mm, thickness A 6 mm pipe was formed. The obtained long pipe was cut every 500 mm in length.
At the time of this cutting, the chips almost did not rise, and a small amount of fine dust adhered to the pipe after cutting, but these could be wiped clean with a piece of cloth.
The obtained pipes were subjected to the following tests with commercially available vinyl chloride resin pipes (89 mm outer diameter, 6 mm thick pipes) and ABS resin pipes (89 mm diameter, 6 mm thick pipes) to compare their performance.
Evaluation of physical properties 1) Specific gravity Test method: JIS K-7112 Plastic-Density of non-foamed plastic and
Specific gravity measurement method.
2) Burning calorie Test method: JIS Z-7302-2.
3) Wear Test Test method: JIS _{K-7204- 1999} Plastics - by abrasive wheels
Abrasion test method. Test load 9.8N, wear wheel H18.
4) Surface resistivity
Test Method: JIS _{K 6911- 1995} thermosetting plastics General Tests
Compliant, charging time 1 minute, test voltage 500V.

  The core obtained by using the rice-blended polyolefin resin composition according to the present invention is compared with the paper tube, vinyl chloride resin core, ABS resin core, and other thermoplastic resin cores currently used in the market. It has excellent characteristics in terms of the manufacturing method and surface resistance of the obtained core surface, and is extremely excellent as a core for winding up sheets or films applied to the latest electronic devices. The value is extremely great.

Claims (6)

  20-95 parts by weight of polyolefin resin (A), 80-5 parts by weight of pregelatinized rice (B), and a compatibilizing agent (C) for improving the affinity at the interface between the polyolefin resin (A) and pregelatinized rice (B) A rice-blended polyolefin resin composition obtained by kneading 0.2 to 20 parts by weight with respect to a total of 100 parts by weight of the components (A) and (B) at a temperature at which the polyolefin resin (A) is thermally fluidized. A core characterized by molding.   The core according to claim 1, wherein the pregelatinized rice (B) is obtained by adding moisture to brown rice or polished rice and heating to gelatinize.   2. The core according to claim 1, wherein the pregelatinized rice (B) is dehydrated after adding moisture to brown rice or polished rice and heating to gelatinize the rice.   The core according to claim 2 or 3, wherein the water is dissolved in at least one of a salt, sucrose, trehalose, an antioxidant, a protein degradation accelerator, and a cellulose degradation accelerator.   The core according to claim 1, wherein the compatibilizing agent (C) is a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof.   The core according to claim 1, wherein an additive for imparting biodegradability is added to the polyolefin resin (A).