JP2011024681A - Planar material for handling food - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simultaneously satisfy conflicting requests requested specially for a planar material for handling food by not only securing sanitation but also suppressing the entire thickness even while using a metallic material and securing strength and heat resistance while maintaining sufficient light weight. <P>SOLUTION: The planar material 10 for handling food includes a core layer 12, a reinforcing layer 14 and a surface layer 16. The core layer 12 and the surface layer 16 are formed from an olefinic resin, and the reinforcing layer 14 is composed of a plurality of metal layers 14A and 14B installed at a distance. The plurality of metal layers 14A and 14B are formed from aluminum or stainless steel, and have the thickness of 0.05-1.5 mm, respectively. The core layer 12 has the thickness of 0.9 mm or more. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement in a plate material for food handling used to knead food such as udon flour and bread or display baked bread in, for example, a udon shop, a bakery, a home, etc. The present invention relates to suppressing deformation due to the influence of load, heat, etc. while ensuring hygiene.

  For example, when kneading foods such as udon flour or bread, or placing baked bread or sweets on a shelf or the like, underlays or shelf-like plates may be used. . As such food handling articles, conventionally, articles formed from plywood or other wood have been used (see, for example, Patent Document 1).

  However, since articles made of wood are natural materials, there is a problem that hygiene cannot always maintain a clean feeling as an article handling food. In particular, it is desirable for goods handling food to comply with the Ministry of Health and Welfare (current Ministry of Health, Labor and Welfare) Notification No. 20 regarding the Food Sanitation Law. It was not appropriate. In this regard, for example, decorative sheets used for furniture and the like, and laminates used for circuit boards and the like are also prepregs made of fiber base materials such as paper as a base material or an interlayer adhesive layer. Similarly, it is not always suitable for use as an article for handling food.

  From this, recently, polystyrene foam (styrene foam) has been used as a material for food handling articles (see Patent Document 1). This expanded polystyrene is easy to process and is excellent in handling due to its light weight. On the other hand, it has low density, so it lacks strength and is used as a shelf board for food display etc. by supporting both ends. Then, if sufficient thickness is not provided, there exists a problem which will bend in the center vicinity.

  In addition to the deformation at room temperature, foods to be handled include foods that have been heat-treated for processing and heated items such as freshly baked bread, but expanded polystyrene has sufficient heat resistance. Therefore, when used for handling foods with such heat, there is also a problem that deformation such as warpage occurs due to the influence of heat.

  In order to prevent deformation such as bending and warping due to the influence of the load and heat, it is conceivable to increase the strength and heat resistance by using a metallic material. However, whether it is a building or furniture, simply using a metallic material for reinforcement, in particular, the greater the thickness of the metallic material for enhancing the reinforcement, the food handling article. There is a risk that the lightness required for the product will be offset. As a result, it is also necessary to increase the thickness of the plate material more than necessary. Therefore, even when a metallic material is used, it is necessary to improve strength and heat resistance while maintaining light weight.

JP-A-9-169328

  In view of the above problems, the problem to be solved by the present invention is not only to ensure hygiene, but also to reduce the overall thickness while using a metallic material while maintaining sufficient lightness and strength. Another object of the present invention is to provide a food-handling plate material that can simultaneously satisfy the conflicting demands that are specially required for food-handling plate-like materials while also ensuring heat resistance.

  The present invention provides, as a first means for solving the above problems, a plate material for food handling provided with a core layer, a reinforcing layer, and a surface layer, wherein the core layer and the surface layer are olefin resins. The reinforcing layer is composed of a plurality of metal layers disposed at a distance, and provides a plate material for food handling.

  The present invention provides, as a second means for solving the above-mentioned problems, in the first solution means, wherein a plurality of metal layers are laminated on both surfaces of a core layer. A plate-like material is provided.

  According to the present invention, as a third means for solving the above problem, in any one of the first and second solving means, the surface layer is laminated on the surface side of the plurality of metal layers. The present invention provides a plate material for handling food products.

  According to the present invention, as a fourth means for solving the above-described problem, in any one of the first to third solving means, the core layer is foamed in a solid state or 1.5 to 5 times. The present invention provides a plate material for food handling, characterized by comprising polypropylene or polyethylene.

  According to the present invention, as a fifth means for solving the above-described problems, in any one of the first to fourth solving means, the core layer has a thickness of 0.9 mm to 20 mm. A plate-like material for food handling is provided.

  The present invention provides, as a sixth means for solving the above-mentioned problems, in any one of the first to fifth solving means, wherein the metal layer is formed of aluminum or stainless steel. A plate-like material for handling is provided.

  According to the present invention, as a seventh means for solving the above-described problem, in any one of the first to sixth solving means, the plurality of metal layers each have a thickness of 0.05 mm to 1.5 mm. The present invention provides a plate-like material for food handling characterized by the above.

  The present invention provides, as an eighth means for solving the above-mentioned problems, in any one of the first to seventh solving means, wherein the surface layer is made of polypropylene or polyethylene. A plate-like material is provided.

  The present invention provides, as a ninth means for solving the above-mentioned problems, in any one of the first to eighth solving means, wherein the surface layer has a thickness of 0.2 mm to 1 mm. A plate-like material for food handling is provided.

  As a tenth means for solving the above-mentioned problems, the present invention provides the food according to any one of the first to ninth solving means, wherein at least the surface layer contains an antibacterial agent. A plate-like material for handling is provided.

  According to the present invention, as described above, since the core layer and the surface layer are formed from olefin-based resins such as polypropylene and polyethylene suitable for handling foodstuffs, sufficient hygiene can be ensured. Of course, since the metal layer is installed as the reinforcing layer, the metal layer that is difficult to expand and contract suppresses the expansion and contraction of the plate-like material. Since a plurality of metal layers are installed, compared to the case where a single or multi-layer metal layer is installed in the center, the resistance to bending and warping is increased, and it is sufficient to make each metal layer thin. Since strength and heat resistance can be ensured, there is an actual advantage that deformation such as bending or warping due to load or heat can be suppressed while suppressing the overall thickness and weight.

  According to the present invention, as described above, since the core layer is formed of an olefin resin, it is possible to ensure an appropriate strength with a sufficient thickness as compared with the case where foamed polystyrene or the like is used. There is an actual advantage that deformation such as bending or warping due to load or heat can be suppressed while suppressing the thickness and weight of the material.

  According to the present invention, as described above, the metal layer is made of aluminum or stainless steel that is excellent in heat resistance and relatively light among the metallic materials, and thus, while ensuring lightness, In addition, there is an advantage that the expansion and contraction of the plate-like material due to the influence of heat can be sufficiently suppressed, deformation such as warpage can be effectively suppressed even at high temperatures, and heat-treated food can be handled appropriately.

It is sectional drawing of the plate-shaped material of this invention. It is a schematic side view of the state which measures the deflection amount of the Example and comparative example of this invention.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a plate material 10 for food handling according to the present invention, and the plate material 10 is shown in FIG. In addition, a core layer 12, a reinforcing layer 14, and a surface layer 16 are provided. This plate-like material 10 is a shelf for placing underlays when kneading food such as udon powder or bread in udon shop, bakery, home, etc., or placing baked bread or sweets etc. It is used as a shelf board or the like when displayed on the screen.

(1. Core layer)
The core layer 12 is arrange | positioned in the center part of the plate-shaped material 10, as shown in FIG. 1, and is formed from an olefin resin. Examples of the olefin-based resin include ABS resin, vinyl chloride resin, polycarbonate, polyester, and the like. In particular, polypropylene or polyethylene is desirable for ensuring hygiene and strength. The use of olefin-based resins in this way can ensure adequate strength with sufficient thinness compared to the case of using expanded polystyrene, etc., while suppressing the overall thickness and weight, while reducing the load and heat. This is because it is possible to suppress deformation such as bending and warping.

  In this case, these olefin-based resins can be used in a solid form, or in the form of a foam in consideration of lightness. However, the core layer 12 preferably has a thickness of at least 0.1 mm in order to give a certain level of strength, although depending on the thickness and material of the other layers, as can be seen from the examples described later. In particular, in order to suppress the bending due to the load, it is desirable that the thickness is 0.9 mm or more. On the other hand, if it is too thick, it affects the handleability and lightness, so even if it is thick, it is 20 mm or less, preferably 5 mm or less. In addition, when using foamed olefin resin as this core layer 12, when it is the same thickness, it can aim at weight reduction, so that a foaming rate becomes high, On the other hand, there exists a tendency for intensity | strength to fall. Therefore, when it is permissible to secure a certain thickness, it can be used up to a foaming rate of 5 times considering lightness, and 1.5 times considering the balance between thickness and strength. It is preferable to use an olefin resin foamed up to 3 times.

(2. Reinforcing layer)
As shown in FIG. 1, the reinforcing layer 14 includes a plurality of metal layers 14 </ b> A and 14 </ b> B. For this reason, since these metal layers 14A and 14B which are hard to expand and contract suppress the expansion and contraction of the plate-like material 10, it is possible to suppress deformation due to a load, heat or the like. In particular, in this case, the plurality of metal layers 14A and 14B are disposed at a distance as shown in FIG. As will be demonstrated in the examples described later, even if the metal layer has the same thickness, the plate-like material 10 is compared with the case where one or multiple metal layers are arranged at the center of the plate-like material 10. If the metal plate is shifted from the center of the plate and placed at a distance, the plate-like material 10 becomes stronger and more resistant to loads and heat. Therefore, sufficient strength and heat resistance can be achieved even if each metal layer is thinned. This is because it is possible to prevent deformation such as bending or warping due to load or heat while suppressing the overall thickness and weight. Specifically, in the illustrated embodiment, as shown in FIG. 1, the plurality of metal layers 14 </ b> A and 14 </ b> B are laminated on both surfaces of the core layer 12, and at a position shifted from the center of the plate-like material 10. Installed at a distance.

  The plurality of metal layers 14A and 14B are preferably formed from aluminum or stainless steel. This is because aluminum and stainless steel are excellent in heat resistance and relatively light among metal materials, so that the expansion and contraction of the plate-like material due to the influence of heat is particularly suppressed while ensuring light weight. Thus, deformation such as warping can be effectively suppressed even at high temperatures, and heat-treated foods can be handled appropriately. However, copper or the like can also be used.

  In this case, each of the plurality of metal layers 14A and 14B preferably has a thickness of 0.05 mm to 1.5 mm, and will be described later in consideration of the balance between lightness and thickness, and resistance to load and heat. As shown in the embodiment, it is desirable that the thickness be around 0.095 mm.

(3. Surface layer)
As shown in FIG. 1, the surface layer 16 is laminated on the surface side of the plurality of metal layers 14 </ b> A and 14 </ b> B, which are the reinforcing layers 14, and is installed as the outermost layer of the plate material 10. It is formed from an olefinic resin to constitute a surface that is in direct contact with the food to be treated. Examples of the olefin-based resin include ABS resin, vinyl chloride resin, polycarbonate, polyester, and the like, and polypropylene or polyethylene is preferable. This is because these olefin-based resins such as polypropylene and polyethylene are suitable for handling foods and can ensure sufficient hygiene compared to natural materials such as wood.

  The surface layer 16 preferably has a thickness of at least 0.2 mm in order to give a certain level of strength. On the other hand, if the surface layer 16 is too thick, the handleability and lightness are affected. It is preferable that the thickness is about 0.5 mm.

  The surface layer 16 can be used as at least a plate-like material 10 for food handling if it is installed on at least one of the front and back surfaces, but can be easily handled while avoiding the determination of the front and back sides. At the same time, in order to prevent the reinforcing layer 14 from being exposed to the surface and at the same time to prevent deformation of the entire plate-like material 10, it is desirable to install it on both sides as shown in FIG. Moreover, since this surface layer 16 comprises the surface which contacts directly with the foodstuff to be handled, it is desirable to contain an antibacterial agent. If this antibacterial agent is contained at least in the surface layer 16, it can be contained in the other core layer 12 and the like in order to further improve hygiene.

(4. Molding of plate material)
The plate-like material 10 can be formed by laminating the core layer 12, the reinforcing layer 14, and the surface layer 16 in a predetermined arrangement with an adhesive and then heating and pressing. Further, this plate-like material 10 has at least a plurality of metal layers 14A and 14B, which are the reinforcing layers 14, symmetrically with respect to the central portion of the plate-like material 10 (see the center line “A” in FIG. 1), and It is preferable to set the thickness and weight uniformly, and more desirably, the entire plate-like material 10 including the surface layer 16 is set symmetrically and evenly with respect to the central portion. As a result, it is possible to suppress the occurrence of deformation such as an unexpected warp without biasing the resistance to load and heat.

  Next, various experimental examples performed for confirming the effect of the plate material 10 for handling food according to the present invention will be described. Specifically, as examples of the present invention, (1) Example 1: 0.9 mm thick solid polypropylene is used as the core layer 12, and the reinforcing layer 14 is bonded to both surfaces of the core layer 12 via an adhesive. The metal layers 14A and 14B made of aluminum each having a thickness of 0.095 mm are laminated, and polypropylene having a thickness of 0.5 mm is laminated as the surface layer 16 on the surface side of the metal layers 14A and 14B with an adhesive. The plate-like material 10 was formed by heating and pressing. Further, as another embodiment of the present invention, in order to confirm the influence on the deformation of the thickness of the core layer 12, only the thickness of the core layer 12 is changed from that of the first embodiment, and the other configurations are all the same. An example was also set. That is, (2) as Example 2, a plate-like material 10 having a core layer 12 thickness of 1.7 mm and (3) Example 3 having a core layer thickness of 3.4 mm was formed. Also, in order to confirm the influence of the structure of the core layer 12, (4) Unlike Example 1 to 3, as the Example 4, the core layer 12 is made of polypropylene expanded to a thickness of 3 times 5 mm. The other structure formed the plate-shaped material 10 of the same structure as Examples 1-3.

  On the other hand, the following various comparative examples were also set to support the effect of suppressing deformation against load and heat depending on the presence / absence, thickness, material, and presence / absence of the reinforcing layer 14 in the present invention. Specifically, first, in order to confirm the effect of the arrangement of the reinforcing layer 14 (the plurality of metal layers 14A and 14B), (A) as Comparative Example 1, from the aluminum having a thickness of 0.095 mm at the center of the plate-like material. A metal layer consisting of 0.5 mm thick polypropylene is laminated on both surfaces of this metal layer via an adhesive as a surface layer via an adhesive, and heated and pressed to form a plate. Material 10 was formed. That is, Comparative Example 1 differs from Examples 1 to 4 only in the presence or absence of the core layer.

  Moreover, in order to prove the lower limit of the thickness of the core layer 12 in the present invention, (B) as Comparative Example 2, except that the thickness of the core layer 12 is 0.5 mm, all the examples of the present invention. A plate-like material having the same configuration was formed. Furthermore, in order to confirm the influence by the presence or absence of the reinforcing layer 14, (C) As Comparative Example 3, as the core layer, polypropylene foamed three times as thick as 5 mm was used, and surface layers were formed on both sides of the core layer. , Each having a thickness of 0.85 mm was laminated with an adhesive and heated and pressed to form a plate-like material 10. That is, the comparative example 3 is different from the examples 1 to 4 in that the reinforcing layer 14 (the plurality of metal layers 14A and 14B) does not exist. In addition, in order to prove the effect of the material and thickness of the core layer 12 in the present invention, (D) as a comparative example 4, a plate-like foamed polypropylene having a thickness of 10 mm was used.

  About these Examples 1-4 and Comparative Examples 1-4, first, in order to confirm the deformation | transformation by a load, it shows in FIG. 2 as a state similar to having used as a shelf board under normal temperature (room temperature 19 degreeC). Thus, on the workbench, each sample is supported from below at two positions spaced by 235 mm, and a weight of 200 g is placed at the center, and the amount of deflection in each experimental example is measured. did. Next, in order to confirm the influence of heat in each of these experimental examples with the weight 200 g shown in FIG. 2 placed, the amount of deflection in a state where each sample was heated to 70 ° C. for 30 minutes, The amount of deflection in the state heated to 90 ° C. over 30 minutes was measured. These results are shown in Table 1 below.

  First, as can be seen from Table 1, Comparative Example 1 (Comparative Example 1 without a core layer) in which a metal layer is arranged in the center and the thickness (interval between metal layers) of 0.5 mm even when the core layer 12 is present. In Comparative Example 2, the amount of deflection was too large to be measured. On the other hand, in Examples 1 to 4 in which the thickness of the core layer (interval between metal layers) was 0.9 mm to 5 mm, the degree of deflection was measurable. From this, in order to suppress deformation with respect to the load, the core layer 12 should be installed and the plurality of metal layers 14A and 14B should be installed at a distance, and the distance should be at least 0.9 mm or more. It was confirmed.

  On the other hand, in Comparative Example 3 in which no reinforcing layer (a plurality of metal layers) is present, the core layer is set to a certain thickness, and the deflection at normal temperature is relatively suppressed, but is heated. The amount of deflection increases accordingly. On the other hand, in Examples 1 to 4 of the present invention in which the reinforcing layer 14 was set, there was almost no change in the amount of deflection between normal temperature and warming. From this, it can be seen that, particularly when the reinforcing layer 14 composed of the plurality of metal layers 14A and 14B is not set, deformation such as warpage due to heat cannot be suppressed.

  Similarly, in the comparative example 4 which is not a plurality of layers of the core layer 12 and the surface layer 16 and is simply a plate-like foamed polypropylene not provided with the reinforcing layer 16, the amount of deflection increases as the temperature is increased. It was confirmed that deformation due to heat could not be suppressed. At the same time, in Comparative Example 4, the amount of deflection with respect to the load at normal temperature seems to be comparable to Examples 1-4 of the present invention, but this is set to a total thickness of 10 mm, which is considerably thicker. Therefore, when the total thickness is the same as that of the present invention, it is considered that the resistance to load is further reduced. In other words, when the foamed polypropylene is simply used in the form of a plate, in order to obtain the same load resistance as the present invention, it is necessary to set the thickness to be considerably thick, which affects the handleability, etc. The resistance to load and heat cannot be improved while the thickness and weight are suppressed as in the present invention. In the present invention, as shown in Example 3, the core layer 12 has a thickness of 3.4 mm (total thickness 4.63 mm), and has a load resistance higher than that of 10 mm thick foamed polypropylene. (In the present invention, it is presumed that the core layer 12 has a thickness of about 2 mm (total thickness of 3 mm) and can obtain the same load resistance as a foamed polypropylene having a thickness of 10 mm. )

  In addition, when paying attention to Examples 1-4 of this invention, it turns out that the tolerance with respect to a load is so high that the thickness of the core layer 12 is thick. Therefore, it is considered that the load resistance at room temperature depends mainly on the thickness of the core layer 12, and it is preferable to set it as thick as possible without affecting the handleability. In addition, since the load resistance is sufficiently secured not only in Examples 1 to 3 in which the core layer 12 is solid but also in Example 4 in the form of foam, the core layer 12 is It was confirmed that the resistance to load and heat can be improved by using a solid or foamed olefin resin if the thickness is set to an appropriate thickness.

  The present invention can be used, for example, in an udon shop, a bakery, a home, etc., to spread underlays when kneading food such as udon flour or bread, or to place baked bread or sweets on a shelf etc. In particular, as a plate-like material for food handling such as a shelf board, in particular, even a heated food can be widely applied.

DESCRIPTION OF SYMBOLS 10 Plate-like material 12 Core layer 14 Reinforcement layer 14A, 14B Metal layer 16 Surface layer

Claims (10)

A plate for food handling provided with a core layer, a reinforcing layer, and a surface layer, wherein the core layer and the surface layer are formed of an olefin resin, and the reinforcing layer is installed at a distance. A plate-like material for food handling, comprising a plurality of metal layers. 2. The plate for food handling according to claim 1, wherein the plurality of metal layers are laminated on both surfaces of the core layer. The food-handling plate material according to claim 1 or 2, wherein the surface layer is laminated on the surface side of the plurality of metal layers. Plate material for use. It is a plate-shaped material for food handling as described in any one of Claim 1 thru | or 3, Comprising: The said core layer consists of a polypropylene or polyethylene which was made into the solid form or foamed 1.5 to 5 times. A plate-like material for food handling. The plate for food handling according to any one of claims 1 to 4, wherein the core layer has a thickness of 0.9 mm to 20 mm. Wood. The plate for food handling according to any one of claims 1 to 5, wherein the metal layer is made of aluminum or stainless steel. . The food material plate according to any one of claims 1 to 6, wherein each of the plurality of metal layers has a thickness of 0.05 mm to 1.5 mm. Plate material for handling. The plate for food handling according to any one of claims 1 to 7, wherein the surface layer is made of polypropylene or polyethylene. The plate for food handling according to any one of claims 1 to 8, wherein the surface layer has a thickness of 0.2 mm to 1 mm. Wood. The plate for food handling according to any one of claims 1 to 9, wherein at least the surface layer contains an antibacterial agent. .

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