JP2003342477A - Resin composition utilizing bread crumbs and its molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for effectively utilizing bread crumbs disposed of as an industrial waste; and a molded article which contains bread crumbs, has a surface not roughened, and has a high mechanical strength. <P>SOLUTION: A composition prepared by compounding bread crumbs, i.e., a food waste, with an oil-and-fat adsorbent and a thermoplastic resin melting at 170°C or lower is thermally mixed and kneaded with a screw-type extruder to cause the adsorbent to adsorb and absorb an oil-and-fat component contained in the bread crumbs; thus mixed and kneaded composition is melted under overheating and molded to give a low-cost molded article which does not allow the oil-and-fat component to float up to its surface and has a high mechanical strength. The molded article can be widely used as a tray for a bread shop, a bread packaging material, a loose cushioning material, daily sundries, a treating agent for animal excrements, etc. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for effectively utilizing bread scraps generated from a bread manufacturing process that is treated as industrial waste. A composition containing a bread crumb and a fat / oil adsorbent as an essential component and a thermoplastic resin having a melting temperature of 170 ° C. or less provides a molded product having high mechanical strength and low production cost.

[0002]

2. Description of the Related Art Conventionally, bread crumbs have been used as a raw material for breeding materials, composting, bread confectionery, etc., and most of them are treated as industrial waste. Is desired.

[0003]

It is desired to develop bread crumbs, which are treated as industrial wastes, into raw materials and convert them into valuables. As a method for utilizing bread crumbs, for example, Japanese Patent Application Laid-Open No. 2001-136915 proposes a method for producing a silage containing bread crumbs as a feeding material.

Under these circumstances, an object of the present invention is to provide a resin composition using bread crumbs having high mechanical strength and excellent moldability and a molded product thereof.

[0005]

Means for Solving the Problems As a result of intensive studies, the inventors of the present invention have blended a thermoplastic resin having a melting temperature of 170 ° C. or less with bread crumbs and an oil / fat adsorbent generated in the bread manufacturing process as essential components. The resulting composition is fed to a screw type extruder, heated and mixed and kneaded to adsorb and absorb the fat and oil component contained in the bread crumbs to the fat and oil adsorbent, and further melted in the extruder at a high temperature to remove the bread crumbs. It was found that a resin composition can be obtained, and that the resin composition provides a raw material for molding and processing, which has a high mechanical strength and a low manufacturing cost, and thus completed the present invention.

According to the first aspect of the present invention, a composition containing bread crumbs and an oil / fat adsorbent as essential components and a thermoplastic resin having a melting temperature of 170 ° C. or less is supplied to a screw type extruder, heated and mixed and kneaded. A resin composition using bread crumbs is characterized in that a fat and oil component contained in bread crumbs is adsorbed and absorbed by an oil and fat adsorbent and further melted by heating to obtain a resin composition.

In the second aspect, the fat / oil adsorbent is an inorganic fat / oil adsorbent and / or a fat / oil-adsorptive polymer agent, and the resin composition using bread crumbs according to claim 1 is provided. I made it a summary.

A third aspect of the present invention is characterized in that the inorganic oil / fat adsorbent described in the preceding paragraph contains one or more selected from the components such as zeolite, magnesium aluminum silicate, kaolinite and bentonite. The gist is a resin composition using the bread crumbs of item 1. In claim 4, the proportion of the fat / oil adsorbent according to claim 3 is 5 to 200 when the inorganic fat / oil adsorbent is used with respect to the bread crumbs.
The resin composition using bread crumbs according to claim 1, characterized in that the content is% by weight.

According to a fifth aspect of the present invention, the fat-and-oil-adsorbing polymer agent according to the second aspect contains one or more fat-and-oil-adsorbing polymer agents such as starch, modified starch, cyclodextrin and cellulose. The gist is a resin composition using the bread crumbs according to claim 1. In claim 6,
The resin using bread crumbs according to claim 1, wherein the proportion of the fat-and-oil absorbing polymer agent according to claim 5 is 5 to 100% by weight of the fat-and-oil absorbing polymer agent with respect to the bread crumbs. The composition was the subject.

In claim 7, the fat-and-oil-adsorbing polymer agent according to claim 2 is the fat-and-oil-adsorbing polymer agent and / or the surfactant according to claim 5. The gist is a resin composition using the bread crumbs.
In Claim 8, the ratio of the surfactant according to Claim 7 is 0.05 to 5% by weight of the surfactant with respect to the bread crumbs, and the bread crumb according to Claim 1 is used. The resin composition thus prepared was used as the gist.

In a ninth aspect, the gist is a molded article comprising the composition according to any one of the first to eighth aspects.
In the tenth aspect, the molded article according to the ninth aspect is formed by injection molding, extrusion molding, blow molding, film molding, or the like.

[0012] Bread crumbs are industrial wastes that are produced during the daily production process of breads that are eaten daily, so they are easily available, and unlike other industrial wastes, they are relatively uniform wastes. The amount of bread crumbs varies depending on the amount of bread produced and the type of bread, but it is from several Kg / day to several tons / day.

[0013] In the process of making bread, shortening oil and the like are added for improving mechanical resistance when kneading dough, increasing swelling after baking, flexibility, and preventing aging. In addition, many additives such as salt, dairy products, yeast and sugar are used according to the type of bread.

Since a large amount of fat and oil components such as shortening oil and butter are added to bread crumbs, when used as a raw material for molding, effects such as fluidity and dispersibility of molding can be obtained.

However, the fat and oil component in the bread crumbs varies depending on the type of bread, but is contained in the range of several percent to ten and several percent, and if the resin composition is used without treating the excess fat and oil component, the molding process is performed. The mechanical strength is slightly reduced, and the surface of the molded product is damaged. Adsorbs excess oil and fat components in bread crumbs
By blending the components to be absorbed, the compatibility of the composition was improved, and the mechanical strength and the surface suitability of the molded product could be improved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. Examples of the bread scraps include nonstandard products that do not become commodities, products that are collected from a bakery store after the expiration date, ears of bread that are generated in the sandwich manufacturing process, dough that is generated in the manufacturing process of bread, and the like. The molded product can be crushed and dried before use, depending on the required physical properties and application.

By using an inorganic oil / fat adsorbent and / or an oil / fat adsorbent polymer as an adsorbent / absorbent for the oil / fat component contained in the bread crumbs, the excess amount contained in the bread crumbs can be obtained. By adsorbing and absorbing the oil / fat component with the adsorbent, the compatibility with the thermoplastic resin is improved, so that it is possible to prevent the oil / fat from floating on the surface of the molded product and the mechanical strength.

The inorganic fat and oil adsorbent preferably has a function of enhancing the strength of the molded product, and examples thereof include zeolite, magnesium aluminum silicate, talc, kaolinite, bentonite, expanded perlite and synthetic silicate. Can be done. The addition ratio of the inorganic fat / oil adsorbent to bread crumbs is 5 to 200% by weight, and if it is 5% by weight or less, the fat and oil component is not adsorbed, and if it is 200% by weight or more, the molded product is It is not preferable because the weight becomes high and the molded product becomes brittle.

Examples of the oil-and-fat adsorbing polymer agent include starch, modified starch, cyclodextrin, cellulose, polymeric polysaccharides and surfactants. Examples of starch include raw starch (corn starch, wheat starch, potato starch, unpurified starch containing protein components, etc.), and starch modified products include pregelatinized starch, oxidized starch, esterified starch, etherified starch and the like. be able to.

Cyclodextrins include α, β,
Examples thereof include γ-type cyclodextrin.
Examples of the cellulose include pulverized products of pulp, waste paper, wood powder, cotton and the like, cellulose derivatives (cellulose acetate, acrylic acid modified cellulose, etc.) and the like. Examples of high-molecular polysaccharides include chitosan, guar gum, xantha gum and the like.

The action of the surfactant as the oil-and-fat adsorbing polymer agent may be such that it disperses, absorbs and adsorbs the oil-and-fat component in bread crumbs, and imparts compatibility and adhesiveness with the thermoplastic resin. . Examples of the surfactant include fatty acid ester (sorbitan fatty acid ester, propylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, etc.), fatty acid glyceride (glycerin monofatty acid ester, glycerin diacetate monolaurate, diglycerin stearate, etc.) Examples thereof include ionic surfactants (trimethyl diester quaternary salt, dimethyl diethyl quaternary salt, monomethyl ester quaternary salt, octadecyl trimethyl ammonium chloride, ester amide, etc.). They can be used alone or in combination of two or more.

The rate of addition is from 0.05 to bread crumbs.
If it is 5% by weight or less, 0.05% by weight or less is not sufficient for adsorbing / adsorbing the oil component in bread crumbs, and if it is 5% by weight or more, sufficient mechanical strength cannot be obtained, which is not preferable.

Bread crumbs include expanding agents, sugars, eggs, proteins,
Since seasonings, milk powder, etc. are mixed, bread crumbs burn when heat-treated under a high temperature condition of 170 ° C or higher. For this reason, in order to obtain a molded product using bread crumbs, it must be processed at a temperature of 170 ° C. or lower. In order to manufacture bread crumbs-containing molded products, in addition to adsorption and absorption of the oil and fat components contained in bread crumbs, thermoplastics that have functions such as mechanical strength of molded products, water resistance and fluidity during processing Resin blending is essential.

The thermoplastic resin has a melting temperature of 170.
There is no particular limitation as long as it is a polyolefin resin at a temperature of not higher than 0 ° C. and / or a biodegradable resin that is subjected to actions such as digestive decomposition, disintegration and insolubilization in a natural environment. Considering environmental pollution, it is preferable to use a thermoplastic resin that does not generate harmful gas and does not damage the incinerator.

For example, as the biodegradable resin, polyvinyl alcohol resin (for example, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyrate, ethylene.
Vinyl alcohol copolymer, etc.), aliphatic polyester-based resin (for example, polycaprolactone, polybutylene succinate, polybutylene succinate adipate,
Examples thereof include homopolymers or copolymers of polyhydroxyvalerate and the like, and modified products of these homopolymers or copolymers).

Examples thereof include aliphatic / aromatic polyester resins (for example, aliphatic carboxylic acids or hydroxy acids, aromatic dicarboxylic acids and block polymers such as 1,3-propanediol or random polymers). They can be used alone or in combination of two or more. The addition rate is arbitrarily added depending on the desired characteristics and application.

As the polyolefin resin, a polyethylene resin having a melting temperature of 170 ° C. or less (high density, low density,
Linear low density or metallocene polyethylene resin, low molecular weight polyethylene resin, etc.), polypropylene homopolymer or block copolymer, low molecular weight polypropylene resin, ethylene vinyl acetate copolymer resin, ethylene propylene rubber and the like. They may be used alone or in combination of two or more, depending on the desired properties and application. The addition rate is arbitrarily added depending on the desired characteristics and application.

The resin composition using the bread crumbs of the present invention may be optionally blended with a known resin additive within a range that does not impair the characteristics of the composition, depending on the desired characteristics and applications. it can. For example, useful additives such as a filler, a fragrance, a colorant, an antioxidant, a flame retardant and an antibacterial agent can be added.

Further, in order to manufacture a molded product using a resin composition using bread crumbs, a known apparatus used for general plastic manufacturing may be used. Examples of these devices include a single-screw extruder, a twin-screw extruder, a Henschel mixer, a ribbon blender, a Banbury mixer, and a combination of two or more of these.

The overheated resin composition can be made into powder, granules or pellets by taking it out from a die having a desired shape. The resin composition using the bread crumbs of the present invention is excellent in compatibilizing properties of the above composition, and thus can be prepared by a known method such as extrusion molding, injection molding, inflation molding, press molding, etc. Molded products such as treating agents, food trays and containers can be manufactured.

[0031]

EXAMPLES Examples of the present invention will be specifically described below.

[Example 1] The ears of a loaf of bread from the process of producing loaf of bread were dried, 50 kg of ground bread crumbs, 12 kg of kaolinite and 3 kg of cellulose powder were put into a Henschel mixer and heated at 70 ° C for 15 minutes to prepare a mixture A. . The composition prepared by mixing 5 kg of metallocene polyethylene resin, 30 kg of high-density polyethylene resin and mixture A was charged into a twin-screw extruder and the extrusion rate was 100 kg / hr.
Bread crumbs-containing pellets were obtained using a die inner diameter of 2.5 mm at 0 to 150 ° C. A predetermined test piece was prepared by using an injection molding machine using these pellets, and the physical properties of the molded product were evaluated. The evaluation method is as follows.

[0032]

[Example 2] The ears of the loaf of bread from the loaf bread manufacturing process were dried and ground, and 50 kg of bread crumbs, 8 kg of kaolinite, 4 kg of talc and 0.5 kg of octadecyltrimethylammonium chloride were added to a Henschel mixer, and 7
Mixture A was prepared by heating and mixing at 0 ° C. for 15 minutes. 2 parts of the composition prepared by mixing 5 kg of metallocene polyethylene resin, 32.5 kg of high-density polyethylene resin and mixture A
Put into the axial extruder, 100 Kg / hour extrusion rate, 120
Bread crumbs containing pellets were obtained using ˜150 ° C. and a die inner diameter of 2.5 mm. A predetermined test piece was prepared by using an injection molding machine using these pellets, and the physical properties of the molded product were evaluated. The evaluation method is as follows.

[0033]

[Example 3] 50 kg of bread waste obtained by drying and crushing the ears of bread from the bread manufacturing process, 8 kg of expanded perlite,
Add 4 kg of talc and 0.5 kg of octadecyltrimethylammonium chloride to a Henschel mixer,
Mixture A was prepared by heating and mixing at 70 ° C. for 15 minutes. The composition obtained by mixing 37.5 kg of polybutylene succinate resin and the mixture A was charged into a twin-screw extruder, and bread crumbs-containing pellets were obtained under the same processing conditions as in Example 1 below. A predetermined test piece was prepared by using an injection molding machine using these pellets, and the physical properties of the molded product were evaluated. The evaluation method is as follows.

[0034]

Comparative Example 1 Bread crumbs-containing pellets were obtained under the same processing conditions as in Example 1, except that 30 kg of high-density polyethylene resin in the composition of Example 1 was changed to 30 kg of polypropylene resin. A predetermined test piece was prepared by using an injection molding machine using these pellets, and the physical properties of the resin composition were evaluated. The evaluation method is as follows.

[0035]

Comparative Example 2 Bread crumbs-containing pellets were obtained under the same treatment conditions as in Example 2 except that 0.5 kg of octadecyltrimethylammonium chloride in the composition of Example 2 was excluded. A predetermined test piece was prepared by using an injection molding machine using these pellets, and the physical properties of the resin composition were evaluated.

The pellets obtained in Examples 1, 2 and 3 and Comparative Examples 1 and 2 were used to prepare predetermined test pieces by an injection molding machine, and the physical properties of the molded articles were evaluated. The evaluation method is as follows. 1) Tensile yield strength and tensile elongation at break: According to JIS K-6922. 2) Bending stiffness (Olzen): According to JIS K-7106. 3) Surface roughness of injection-molded products. ○ No change × Slight surface roughness was observed 4) Injection moldability was evaluated by the moldability of the dumbbell-shaped test piece used for physical property evaluation. ○ Normal × Slight molding failure

[0037]

[Table 1]

The results obtained in Examples 1, 2 and 3 are:
It had high mechanical strength and excellent moldability and fluidity. In Comparative Example 1, when a polypropylene resin having a high melting temperature was blended, the pellet had a non-uniform composition and was slightly charred, and a good quality pellet could not be obtained. In Comparative Example 2 in which the surfactant which is the oil-and-fat adsorbing polymer agent is not added, the mechanical strength is lower than that in Example 2.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08L 3/02 C08L 3/02 F term (reference) 4F071 AA08 AA09 AA15 AA15X AA20 AA20X AA28 AA28X AA29 AA43 AA44 AB30 AE10 AE22 AH01 AH05 BB05 BB06 BB13 BC01 4J002 AB013 AB042 AB043 AB053 BB031 BB061 BB121 BB151 BE021 BE031 BF011 BF021 CF031 CF191 DJ006 DJ046 FD203 FD206 FD316 GG01 GT00

Claims (10)

[Claims] 1. A composition containing a bread crumb and an oil / fat adsorbent as an essential component and a thermoplastic resin having a melting temperature of 170 ° C. or less is fed to a screw type extruder, heated and mixed and kneaded to obtain bread crumb. Adsorbs and absorbs contained fats and oils components into the fats and oils adsorbent,
A resin composition using bread crumbs, which is characterized in that it is further melted by heating to obtain a resin composition. 2. The resin composition using bread crumbs according to claim 1, wherein the fat and oil adsorbent is an inorganic fat and oil adsorbent and / or a fat and oil adsorbent polymer agent. 3. The inorganic fat / oil adsorbent according to the preceding paragraph contains one or more selected from components such as zeolite, magnesium aluminum silicate, kaolinite and bentonite. A resin composition using bread crumbs. 4. The bread crumbs according to claim 1, wherein the proportion of the fat / oil adsorbent according to claim 3 is 5 to 200% by weight of the inorganic fat / oil adsorbent with respect to the bread crumbs. Resin composition. 5. The oil-and-fat-adsorbing polymer agent according to claim 2, wherein the oil-fat adsorbing polymer agent comprises one or more selected from components such as starch, modified starch, cyclodextrin, and cellulose. A resin composition using the bread crumbs of. 6. The bread according to claim 1, wherein the proportion of the fat-and-oil-adsorbing polymer agent according to claim 5 is 5 to 100% by weight of the fat-and-oil-adsorbing polymer agent with respect to the bread waste. A resin composition that uses scraps. 7. The bread crumbs according to claim 1, wherein the fat-and-oil-adsorbing polymer agent according to claim 2 is the fat-and-oil-adsorbing polymer agent according to claim 5 and / or a surfactant. The resin composition used. 8. The bread crumbs according to claim 1, wherein the ratio of the surfactant according to claim 7 is 0.05 to 5% by weight of the surfactant with respect to the bread crumbs. Resin composition. 9. A molded article comprising the composition according to claim 1. 10. A molded article formed by injection molding, extrusion molding, blow molding, film molding, or the like.
The molded article according to.