JPH08258881A - Easily peelable molding and production thereof - Google Patents

Abstract

PURPOSE: To provide a molding to which food is hand to stick in the case of taking out the food from the molding and the production method thereof, when food, perticularly protein food, food like processed egg for instance, is packaged by a molded material. CONSTITUTION: At least, the contact side with food is made of a molded layer containing a composition of an olefin resin and a surfactant. The quantity W of the surfactant of which HLB existing in 1cm<3> of the layer is 6.0 or higher, satisfies the expressions I, II. Expression I: W×N<3/2> ×d>=0.375, where W: weight (mg) of surfactant, N: HLB number of surfactant, d: thickness (cm) of the layer containing a composite material of olefin resin and surfactant. Expression II : W<=12, where W: weight (mg) of surfactant.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an easily peelable molded article and a method for producing the same. Specifically, when a food, particularly a protein food, for example, a food product such as an egg processed product, is packaged with a molded product, the molded product having a feature that the food is difficult to adhere to the molded product when the food is taken out from the molded product and the production thereof Regarding the method.

[0002]

2. Description of the Related Art Food ingredients, their properties, or their preservation,
There are various treatment conditions, and packaging materials suitable for each are developed and used. For example, when packaging the molded product so that it comes into contact with the food, and then taking out the food from the molded product, if the adhesive force between the food and the molded product is greater than the structural adhesive force (or cohesive force) of the food itself, An unfavorable phenomenon occurs in which a part of the food adheres to the molded product and reduces the commercial value. As a method for solving such a problem, a method is used in which a release agent is kneaded into a resin constituting a molded product, and the action of the release agent which is leached on the surface of the molded product with heat treatment or time elapses is employed.

For example, Japanese Unexamined Patent Publication (Kokai) No. 2-127236 discloses a tray for a fermented steamed food characterized in that a heat-resistant plastic raw material that can withstand the temperature of steam steaming is kneaded with a release agent to form a tray. ing. Examples of plastic raw materials include polypropylene and high-density polyethylene, and polyethylene glycol, which is an emulsifier for food additives, glycerin ester of higher fatty acid, sucrose ester, and the like are used as a release agent. Specifically, in the example, a sheet having a thickness of 0.1 mm, which is made of a material containing 2.8 parts of glycerin ester of polyethylene glycol based on 100 parts of polypropylene, is used.
It is described that it is molded into a tray. It is described that even if Amman or Butaman, which is a fermentation raw material, is steam-steamed while being placed on the tray, the peeling agent is leached on the tray due to heat and the steamed product does not stick to the tray.

[0004] In the method of kneading a release agent into a resin constituting a molded product and utilizing the action of the release agent which is heat-treated or leaches to the surface of the molded product with the lapse of time, the resin is considered to be easy to separate the food from the molded product. It is preferable to increase the amount of the release agent kneaded into. However, when a composition containing a large amount of a release agent in a resin is melt extruded from an extruder and a molded article is produced, the release agent impregnated in the composition adheres to the surface of the screw or cylinder in the extruder. If so, there is a drawback that slipping occurs and extrusion cannot be performed with a stable extrusion amount.

From the viewpoint of the production of the molded product as described above, it is preferable that the amount of the release agent kneaded into the resin is extremely small, but the food and the molded product cannot be easily separated from each other, so that the molded product can be easily separated. There is a drawback that food adheres to the and deteriorates the commercial value.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to enable stable extrusion molding in the production of a molded product, and further to produce a food from a molded product, particularly, It is an object of the present invention to provide a molded product in which food is unlikely to adhere to a molded product when a protein food such as livestock food is taken out, and a method for producing the molded product.

[0007]

Means for Solving the Problems The inventors of the present invention have made extensive studies as to the compatibility between a polyolefin resin and a specific surfactant, and as a result, kneaded a specific amount of the specific surfactant into a polyolefin resin. It has been found that it can be easily produced by melt-extruding the incorporated composition at a specific temperature, and that the obtained molded product has a good releasability from foods, thus completing the present invention.

That is, the first aspect of the present invention is a molded article, wherein at least the side in contact with the article to be packaged is a layer containing a composition of a polyolefin resin and a surfactant.
The easily peelable molded article is characterized in that the amount W of the surfactant having HLB of 6.0 or more in the cm ³ volume satisfies the following formulas (A) and (B). W × N ^3/2 × d ≧ 0.375 − (A) (W: amount of surfactant (mg), N: HL of surfactant
B number, d: thickness of layer containing composition of polyolefin resin and surfactant (cm)) W ≦ 12 − (B) (W: amount of surfactant (mg))

A second aspect of the present invention is to manufacture an easily peelable molded article having a layer containing a composition of a polyolefin resin having a thickness of d (cm) and a surfactant on at least the side that comes into contact with the article to be packaged. In doing so, the layer is covered with a polyolefin resin 10
Extruding a composition in which the amount P of the surfactant having an HLB of 6.0 or more relative to 0 parts by weight satisfies the following formulas (C) and (D) at an extrusion temperature of 200 to 220 ° C. The present invention relates to a method for producing an easily peelable molded article. P × N ^3/2 × d ≧ 1.39 × 10 ⁻¹ − (C) (P: parts by weight of surfactant based on 100 parts by weight of polyolefin resin, N: number of HLB of surfactant) P ≦ 4. 5- (D)

As the polyolefin resin in the present invention, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HD
PE), polypropylene, polymethylpentene and the like can be exemplified, and polyethylene is particularly preferable. These may be used alone, or two or more kinds may be mixed and used for the purpose of improving moldability and mechanical properties during packaging. Furthermore, within a range that does not impair the effects of the present invention, even if ethylene-vinyl acetate copolymer, modified polyolefin resin or the like is mixed and used, an additive such as a slip agent or an anti-blocking agent is added to the polyolefin resin. You may mix | blend 0.1-1 weight part with respect to 100 weight part.

The surfactant in the present invention is a food-grade emulsifier. As the food emulsifier, glycerin acetate, glycerin lactic acid ester, glycerin succinic acid ester, glycerin succinic acid ester, glycerin diacetyl tartaric acid ester, polyglycerin fatty acid ester, polyglycerin condensed ricinoleic acid ester and the like, and derivatives thereof, syrup Examples thereof include sugar fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester, lecithin, calcium stearoyl lactylate, oxyethylene higher aliphatic alcohol, sodium oleate, morpholine fatty acid salt, and polyoxyethylene higher aliphatic alcohol. Specifically, for example, tetraglycerin monostearate (HLB: 8), tetraglycerin monooleate (H
LB: 8), tetraglycerin monolaurate (HL
B: 10) etc., tetraglycerin fatty acid ester obtained by esterifying tetraglycerin with fatty acid, hexaglycerin monostearate (HLB: 10), hexaglycerin sesquistearate (HLB: 10), hexaglycerin tristearate (HLB: 7). ), Hexastearin monooleate (HLB: 11), hexaglycerin monolaurate (HLB: 13) and the like, hexaglycerin fatty acid ester obtained by esterifying a fatty acid with hexaglycerin, decaglycerin monooleate (HLB: 1).
3), decaglycerin monolaurate (HLB: 15)
Polyglycerin fatty acid ester produced by esterifying polyglycerin and fatty acid such as decaglycerin fatty acid ester obtained by esterifying decaglycerin and fatty acid.

As a combination of the polyolefin resin and the surfactant, polyethylene is preferably used as the polyolefin resin and a surfactant having HLB of 7.0 or more is preferably used.

In the layer containing the polyolefin resin and the surfactant constituting the easily peelable molded article of the present invention, the surfactant present in the volume of 1 cm ³ of the layer satisfies the following formulas (A) and (B). It is necessary that the amount W is kneaded into the polyolefin resin. W × N ^3/2 × d ≧ 0.375 − (A) (W: amount of surfactant (mg), N: HL of surfactant
B number, d: thickness of layer containing composition of polyolefin resin and surfactant (cm)) W ≦ 12 − (B) (W: amount of surfactant (mg))

When the amount of the surfactant present in 1 cm ^{3 of the} layer is less than the amount satisfying the above formula (A), protein foods such as livestock foods cannot be easily peeled off from the molded article, and the foods Part of the product adheres to the molded product, and not only the peeling operability is poor, but also the appearance of the food taken out is impaired, and the commercial value is reduced. On the other hand, when the amount of the surfactant present in the volume of 1 cm ^{3 of} the layer is more than the amount satisfying the above formula (B), the amount of the release agent due to bleed-out during the production of the molded product is increased and the extrusion stability is deteriorated. In addition, the obtained molded product becomes sticky and difficult to handle. The preferable numerical value on the right side of the formula (A) is 0.4, and more preferably 0.45. Further, the preferable numerical value on the right side of the formula (B) is 1
It is 0, and more preferably 8.

The easily peelable molded article of the present invention means a film,
Examples include trays, containers, bottles, nets and the like. These molded products may be either a single layer or a multilayer, and in the case of a multilayer, a molded product containing at least a layer containing a composition of a polyolefin-based resin and a surfactant on the side in contact with the object to be packaged may be used. . Layers other than the layer containing the composition of the polyolefin resin and the surfactant are not particularly limited, for example, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyamide resins such as nylon. Examples of the layer include a resin, a hard vinyl chloride resin, and a methacrylate ester-based resin such as polymethylmethacrylate. In addition, as a combination of lamination, for example, a three-layer film including a surfactant-containing polyethylene resin layer / polyamide resin layer / polypropylene resin layer, and a surfactant-containing polyethylene resin layer / polyvinylidene chloride resin layer / polypropylene resin layer Examples thereof include a three-layer film and a three-layer film including a surfactant-containing polyethylene resin layer / ethylene-vinyl alcohol copolymer resin layer / polypropylene resin layer.

Further, when a composition in which a surfactant having a high HLB is kneaded into a polyolefin resin is used as a layer on the side of a molded article having multiple layers which comes into contact with food,
The resin constituting the layer in contact with the layer is preferably lipophilic in order to prevent migration of the surfactant.

The thickness d of the layer containing the composition of the polyolefin resin and the surfactant of the present invention is 10 to 200 μm, preferably 20 to 150 μm. The total thickness of the easily peelable molded article containing at least one layer is not particularly limited, but is usually set in consideration of moldability, particularly deep drawability, peelability, strength, economical efficiency and the like. Generally 50-500
μm, preferably 70 to 300 μm.

The amount W of the surfactant contained in the layer containing the composition of the polyolefin resin having the thickness d of the present invention and the surfactant bleeds out to the surface of the molded article from the viewpoint of easy peeling property. Considering the amount of surfactant, formula (A)
From relationship, if a thin thickness of the layer MUST many amount of surfactant present in the layer 1 cm ³ volume, whereas, in the layer 1 cm ³ in volume when the thickness of the thicker layer The amount of surfactant present can be reduced.

Further, in consideration of both easy peeling property and extrusion stability, when a surfactant having a large HLB is used, it is present in 1 cm ³ volume of the layer as compared with a case where a surfactant having a small HLB is used. Since the amount of the surfactant to be used can be reduced, the selection range of the layer thickness of the composition of the polyolefin resin and the surfactant is wide. From this, the HLB of the surfactant needs to be 6.0 or more, preferably 7.0 or more, and more preferably 8.0 or more.

In the method for producing the exfoliatable molded article of the present invention, the thickness d (c) is provided at least on the side in contact with the article to be packaged.
In producing an easily peelable molded article having a layer containing the composition of m) a polyolefin resin and a surfactant, the layer is prepared by adding HL to 100 parts by weight of the polyolefin resin.
The amount P of the surfactant in which B is 6.0 or more is calculated by
And a composition satisfying (D), an extrusion temperature of 200 to 2
An example of the method is extrusion molding under the condition of 20 ° C. P × N ^3/2 × d ≧ 1.39 × 10 ⁻¹ − (C) (P: parts by weight of surfactant based on 100 parts by weight of polyolefin resin, N: number of HLB of surfactant) P ≦ 4. 5- (D) The obtained easily peelable molded product has the amount W of the surfactant present in 1 cm ³ volume of the layer of the composition of the polyolefin-based resin and the surfactant in the formulas (A) and (B). To be satisfied.

When the amount of the surfactant contained in the composition before melt extrusion is less than the amount satisfying the above formula (C), the obtained molded product does not easily peel off the food, and The part adheres to the molded product, and not only the peeling operability is bad, but also the appearance of the food taken out is impaired, and the commercial value is reduced. On the other hand, when the amount of the surfactant contained in the composition before melt extrusion is more than the amount satisfying the above formula (D), the amount of the release agent due to bleed-out during the production of the molded product is increased, and the extrusion stability is increased. And the resulting molded article becomes sticky and difficult to handle.

In the method for producing an easily peelable molded product by melt extrusion, the amount of the surfactant contained in the extruded molded product is contained in the pellet because the surfactant exudes from the pellet and evaporates. Less than the amount of surfactant. When a polyethylene resin is blended with a surfactant and melt-extruded under conditions of an extrusion temperature of 200 to 220 ° C., about 30% of the amount of the surfactant contained in the pellets is contained in the melt-extruded molded product. It will be the amount of the agent. That is, under the conditions of an extrusion temperature of 200 to 220 ° C., an easily peelable molded article is obtained by melt-extruding a composition containing a polyolefin-based resin satisfying the conditions of the formulas (C) and (D) and a surfactant. can get. However, the method for producing the easily peelable molded product of the present invention is not limited to this, and appropriately adjusts the surfactant in the pellet in consideration of the bleeding amount of the surfactant corresponding to the extrusion temperature, and melts it. By extrusion molding, an easily peelable molded product that satisfies the formulas (A) and (B) can be produced.

The polyolefin resin and the surfactant are compounded in a predetermined amount by mixing a relatively large amount of the surfactant in advance with the polyolefin resin to prepare a masterbatch pellet, which is then mixed with the uncompounded polyolefin resin pellets. It is preferable to use a blended composition as the surfactant ratio. The obtained composition is manufactured into a molded product by a known method.

The molded product obtained by the melt extrusion molding method is
It is considered that the surfactant bleeds out on the surface of the molded product by heating boiled or the like after the packaging, thereby providing easy peeling property.

Foods to which the easily peelable molded product of the present invention is preferably applied include egg-processed products such as fried eggs and fried eggs, and protein foods represented by kneaded foods such as fish meat sausage and kamaboko. More preferably, it is applied to a food having a small structural adhesive strength (or cohesive strength).

By using the easily peelable molded product of the present invention, it is possible to carry out low temperature distribution of processed egg products for business, which has been impossible in the past. For example, fried egg production and use can be accomplished in the following manner. 1) A film which is an easily peelable molded product of the present invention is molded into a concave shape by a deep-drawing machine to obtain a food packaging container, and the concave portion is filled with raw eggs and covered with a normal packaging film to form a package. obtain. 2) 15-20 until the food is solidified in the obtained package.
After heating with steam at a temperature of about 80 to 95 ° C. for a minute, it is cooled in a cooling tank and chilled. 3) Peel off the wrapping film of the circulated package, take out the fried egg, and use it. Hereinafter, the present invention will be described in more detail with reference to Examples.

[Evaluation Method] (Extrusion Stability) The extruded state was observed and evaluated by the upward direct inflation method. Table 1 shows the evaluation criteria.

[Table 1] Good: Extrusion stability is good. Poor: Extrusion is unstable and the film is cracked or cannot be formed.

(Peelability) From peelable film to size 1
A bag of 00 mm × 120 mm was prepared, and the bag was filled with split eggs, then boiled at a hot water temperature of 85 ° C. for 15 minutes and cooled to prepare a fried egg-containing package. After storing this at 10 ° C. for 2 weeks, the package was opened and the peelability was evaluated. Table 2 shows the evaluation criteria.

[Table 2] ○: The food does not adhere to the film at all and the releasability is very good. X: The adhesion is extremely poor.

(Examples 1 to 7, Comparative Examples 1 and 2) LDPE
(Melt index, 2) 30% by weight and LLDPE
A composition prepared by mixing 100 parts by weight of a resin pellet mixture consisting of 70% by weight (melt index, 0.8) with the surfactants shown in Tables 3 and 4 at a temperature of 210
A film having a thickness shown in Tables 3 and 4 was formed by an upward direct inflation method under the condition of ° C to obtain an easily peelable film. The obtained film was allowed to stand at room temperature for 1 day, and the amount of the surfactant present in the volume corresponding to 1 cm ³ of the film was measured by the Soxhlet method using methanol as a solvent. The results are shown in Tables 3 and 4. Further, the extrusion stability and the peeling property were evaluated by the above evaluation methods, and the results are shown in Tables 3 and 4. The abbreviations for the surfactants indicate the following compounds. M
O-750 means decaglycerin monooleate,
MO-310 is tetraglycerin monooleate, MO
-500 is hexaglycerin monooleate, PO-3
10 indicates tetraglycerin pentaoleate.

[0030]

[Table 3]

[0031]

[Table 4]

[0032]

As described above, according to the present invention,
Provided are a molded product that can be stably extruded in the production of a molded product, and further, a food product is less likely to adhere to the molded product when a food, particularly a protein food such as a livestock food, is taken out from the molded product, and a method for producing the same.

Claims (4)

[Claims] 1. A molded article, which is a layer containing a composition of a polyolefin resin and a surfactant, at least on the side in contact with the article to be packaged, and H existing in a volume of 1 cm ^{3 of} the layer.
The amount W of the surfactant having LB of 6.0 or more is calculated by
And an easily peelable molded article which satisfies (B). W × N ^3/2 × d ≧ 0.375 − (A) (W: amount of surfactant (mg), N: HL of surfactant
B number, d: thickness of layer containing composition of polyolefin resin and surfactant (cm)) W ≦ 12 − (B) (W: amount of surfactant (mg)) 2. The easily peelable molded article according to claim 1, wherein the molded article is a film. 3. The easily peelable molded article according to claim 1, wherein the polyolefin resin is a polyethylene resin. 4. When producing an easily peelable molded article having a layer containing a composition of a polyolefin resin having a thickness d (cm) and a surfactant at least on the side that comes into contact with the article to be packaged, said layer A composition in which the amount P of the surfactant having an HLB of 6.0 or more with respect to 100 parts by weight of the polyolefin-based resin satisfies the following formulas (C) and (D):
A method for producing an easily peelable molded article, which is produced by extrusion molding under the conditions of 00 to 220 ° C. P × N ^3/2 xd ≧ 1.39 × 10 ⁻¹ − (C) (P: weight part of surfactant, N: HLB number of surfactant) P ≦ 4.5 − (D)