JP2008284274A - Plastic blade sheet, plastic blade, and carton for storing film-like material - Google Patents

Abstract

[Problem] To provide an inexpensive sheet for plastic knives, which has good workability and handleability, does not spill when formed into a knives, and provides a good sharpness.
A plastic blade sheet in which a filler blend layer in which an inorganic filler is blended and a base layer having an inorganic filler blend amount less than the inorganic filler blend amount in the filler blend layer is laminated.
[Selection] Figure 1

Description

  The present invention relates to a plastic blade that can replace a metal or ceramic blade, and a sheet for a plastic blade that enables such a plastic blade.

  Household or business wrap films, aluminum foil (foil) and the like are generally supplied in a state of being wound around a paper tube and stored in a rectangular paper box (carton for storing film-like material).

  The user opens the lid of such a paper box, draws out a film or foil by a desired length, closes the lid, and then the metal provided on the paper box body or lid Cut the film and foil with a blade made of steel.

There have been various problems with such storage containers.
1. During use, a metal blade may cause injury.
2. Since metal blades are non-combustible materials, it has been necessary to remove them from a paper box for separation at the time of disposal. In this case, labor and danger become problems.
3. If it is discarded without performing the above operation 2, the amount of incombustible waste increases, or metal members are mixed into the combustible waste.
4). The metal blade is expensive.

  Here, the blade part is made of hard paper or hard plastic, but measures such as deterioration or breakage due to moisture (in the case of paper), “cut” However, there is a problem that sufficient durability cannot be obtained.

For this reason, in the technique described in JP-A-11-99498 (Patent Document 1), a technique for adding an inorganic filler (inorganic filler) is described, but costly biaxial stretching is necessary in terms of equipment. In addition, it is necessary that the added amount of the inorganic filler is less than 26% by weight, and exceeding this added amount makes it extremely brittle when trying to obtain a sufficient “sharpness”, and the handleability is greatly reduced. It has been found that there is a big problem that even if it can be processed into a sawtooth shape, "blade spillage" occurs.
JP-A-11-99498

  The present invention improves these problems, i.e., good workability, handleability, no blade spill when used as a knife, and an inexpensive sheet for plastic blades that provides good sharpness, good sharpness, The object is to provide a blade that does not spill and that can be incinerated when the raw material resin is selected from those that do not contain a halide, is highly safe and less expensive to damage the human body.

  In order to solve the above-mentioned problems, the sheet for plastic blades of the present invention contains a filler compounded layer in which an inorganic filler is compounded and an inorganic filler compounded in an amount less than the inorganic filler compounded amount of the filler compounded layer as described in claim 1. It is the sheet | seat for plastic cutters characterized by being laminated | stacked with the base layer which is quantity.

  Furthermore, the plastic knife sheet of the present invention is the plastic knife sheet according to claim 1, wherein at least one filler compounding layer is provided on each of both side surfaces of the base layer, as described in claim 2. It is characterized by being laminated.

  The plastic blade sheet of the present invention is the plastic blade sheet according to claim 1 or 2, wherein the amount of the inorganic filler in the filler compounded layer is 30% by weight or more. It is characterized by being.

  Moreover, the plastic cutter sheet of the present invention is the plastic cutter sheet according to any one of claims 1 to 3, wherein the inorganic filler is talc, titanium oxide, sulfuric acid. It is one or more types selected from barium, calcium carbonate, and silica.

  According to a fifth aspect of the present invention, there is provided a plastic cutter comprising the plastic cutter sheet according to any one of the first to fourth aspects.

  A carton for storing a film-like object according to the present invention comprises, as described in claim 6, a plastic knife according to claim 5 for cutting a film-like object containing the film. A carton.

  The plastic blade of the present invention has a high degree of freedom in shape, has good sharpness, does not spill, and can be incinerated without the generation of harmful halogen gases when the resin used is selected from those that do not contain halides. Yes, it is hard to hurt the human body, light weight, high safety and low price. For this reason, it can be applied to fields such as toys as well as replacement of general household blades.

  Further, since the degree of freedom in forming is high, it can be applied not only to a flat blade, but also to a blade for cutting an irregular shape (for example, obtaining a cutting shape similar to a pinking rod).

  Moreover, according to the sheet | seat for plastic cutters of this invention, said outstanding plastic cutter can be made possible.

  The plastic knife sheet of the present invention may be formed by laminating a filler compounded layer in which an inorganic filler is compounded and a base layer having an inorganic filler compounding amount less than the inorganic filler compounding amount of the filler compounding layer. is necessary.

  A general resin can be used as the matrix resin component that constitutes the filler compounded layer in which the inorganic filler is compounded, but usually contains halides in consideration of cost, safety during incineration, moldability, etc. In consideration of hardness and abrasion resistance as a blade, it is selected from those that are not present. From such points, homopolypropylene, block polypropylene, random polypropylene, high-density polyethylene, low-density polyethylene, and the like are desirable.

  As the inorganic filler to be blended in the filler blend layer formed by blending the inorganic filler, magnesium oxide, calcium oxide, titanium oxide, zinc oxide, magnesium sulfate, calcium sulfate, barium sulfate, calcium carbonate, magnesium carbonate, barium carbonate, alumina , Aluminum hydroxide, silica, talc, kaolin, glass powder and the like. Of these, talc, titanium oxide, barium sulfate, calcium carbonate, silica and the like are particularly preferable.

  Among the above inorganic fillers, titanium oxide is classified into its anatase type, rutile type and brookite type from its crystal system, and any crystal system can be used normally, but it has a catalytic ability with organic substance decomposability. It is desirable in terms of durability to select from those that do not.

  Calcium carbonate has calcite, argonite, and vaterite as crystal forms, but any crystal form can be used. Silica is natural or synthetically obtained silicic acid, and kaolin is a hydrous aluminum silicate produced naturally, and a calcined type from which crystal water has been removed can also be used. On the other hand, talc is a naturally occurring hydrous magnesium silicate.

  The inorganic filler preferably has an average particle size of 5 μm or more and 30 μm or less in terms of uniform dispersibility, moldability, and strength (physical property strength).

  Moreover, in order to improve the dispersibility in the matrix resin, these inorganic fillers may be used in which the surface is coated with an oxide such as alumina, silica, zinc oxide or the like and subjected to a surface treatment with an aliphatic polyol or the like. good.

  The blending amount of the inorganic filler in the filler blend layer is generally 20% by weight or more, preferably 30% by weight or more so that a sufficiently good sharpness can be obtained. The upper limit is usually 70% by weight or less, although it depends on the type of resin and filler and the thickness of the layer.

  Since the plastic blade of the present invention can reduce the burned calories by blending these inorganic fillers, it does not reach a high temperature even when burned, and can therefore be incinerated with paper or the like.

  The matrix resin and the inorganic filler are mixed by a common means such as a roll mill, a Banbury mixer, a kneader, a Henschel mixer, and uniformly dispersed.

  Since the base layer is a layer for supporting and reinforcing the filler blending layer, the inorganic filler is not blended at all, or even when blended, the inorganic filler blending amount is smaller than the blending amount in the filler blending layer. And As a result, since the required amount of inorganic filler as a sheet is reduced, moderate elasticity can be imparted to the sheet, and cracks and breaks can be prevented.

  The resin for forming the base layer can be appropriately selected in the same manner as the matrix resin for forming the filler compounding layer. However, the recyclability and the point at which delamination with the filler compounding layer is prevented (in the case of lamination by melt extrusion lamination) ) And the like, it is desirable to use the same matrix resin except in special cases.

  As long as the effects of the present invention are not impaired, additives and additives such as pigments and dyes, metal powders and reinforcing materials (glass fibers, carbon fibers, etc.) are added to these filler blend layers and base layers. You may do it. These can change a compound and a compounding ratio for every layer, for example, a special design effect can also be acquired by changing the colorant to mix | blend for every layer. However, it is necessary to confirm the safety of any raw material when applying it to food fields such as food processing / packaging, medical fields, toys, etc., and select them appropriately.

  As described above, the base layer is usually formed thicker than the filler-blending layer in order to improve the strength of the sheet and the blade and prevent cracking and breaking. Although it depends on the resin used, it is usually set to 0.2 mm or more so that sufficient strength can be obtained.

  On the other hand, the filler compounding layer is sufficient if it has a thickness that can provide durability as a blade, and can be made thinner than the base layer. At this time, the required amount of the inorganic filler as a sheet is small. In general, the thickness of the filler-containing layer is preferably 30 μm or more in consideration of durability.

  In the plastic blade sheet of the present invention, the filler blend layer can be formed on one side or both sides of the base layer. Here, FIG. 1A is a model sectional view of the sheet A for a plastic knife according to the present invention in which a filler compound layer 2 is arranged on one side of the base layer 1, and FIG. A model cross-sectional view of the sheet B for a plastic knife according to the present invention in which the layer 2 is arranged is shown.

  In the plastic blade sheet of the present invention, other layers may be provided as necessary. However, it is usually desirable that the filler-blending layer is disposed in the outermost layer because of its functionality as a blade.

  The filler blend layer and the base layer can be laminated by a normal lamination method. In other words, adhesive lamination, melt extrusion lamination, press lamination, etc. can be mentioned, but the melt extrusion lamination method requires fewer steps, eliminates the need for adhesives, and does not easily cause delamination, so that a highly durable plastic blade can be obtained. It is done.

  Using the sheet for plastic cutter of the present invention, a desired shape such as a saw blade by pressing or the like, for example, a saw blade shape (a model diagram of the saw blade-shaped plastic cutter 3 according to the present invention is shown in FIG. 2A) or a knife A plastic blade is cut into a shape (a model diagram of the knife-shaped plastic blade 4 according to the present invention is shown in FIG. 2B).

Examples of the plastic blade sheet of the present invention will be specifically described below.
<Resin composition for filler compounding layer>
As the filler to be blended in the filler blending layer, PKP-53S manufactured by Fuji Talc Kogyo Co., Ltd. is used. Then, after kneading and granulating with a Henschel mixer, a resin composition for a filler compounding layer was obtained by extrusion molding.

<Base layer resin composition>
As the base layer resin composition, the same block polypropylene as that of the matrix resin of the filler compounding layer was used as it was.

<Sheet>
A sheet for plastic blades according to the present invention having a filler compounding layer having a thickness of 50 μm on one side of a base layer having a thickness of 250 μm by the melt extrusion laminating method using the resin composition for filler compounding layer and the resin composition for base layer. α was obtained.

<Cutting and evaluation>
Press cutting was performed using the sheet α for a plastic blade, and a saw-tooth blade β (length: 30 cm) shown as a model in FIG. 2A was obtained. This serrated blade β was attached to a lid of a storage carton of a commercially available polyvinylidene chloride film for food packaging (width 30 cm, length 20 m) by replacing the metal blade. At the time of attachment to the carton, a commercially available general office stapler (Max No. 10 stapler manufactured by Max Co., Ltd.) was used.

  The handling of such a carton-containing film is exactly the same as a commercially available one with a metal blade, and it was evaluated until it was cut every 30 cm and the film disappeared. There was no difference between the sharpness of the blades and the blades were not cracked or cracked.

It is a model sectional view showing the composition of the sheet for plastic knives of the present invention. (A) It is a model sectional view of sheet A for plastic knives concerning the present invention which arranged filler compounding layer 2 on one side of base layer 1. (B) It is a model sectional view of sheet B for plastic knives concerning the present invention which arranged filler compounding layer 2 on both sides of base layer 1. It is a model figure which shows the example of the cutter formed using the sheet | seat for plastic cutters concerning this invention. (A) It is a model figure of the saw blade-shaped plastic cutter 3 concerning this invention. (B) It is a model figure of the knife-shaped plastic cutter 4 concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base layer 2 Filler compounding layer 3 Saw blade-shaped plastic blade according to the present invention 4 Knife-shaped plastic blade according to the present invention

Claims (6)

  A sheet for plastic blades, characterized in that a filler compounded layer in which an inorganic filler is compounded and a base layer having an inorganic filler compounding amount less than the inorganic filler compounding amount of the filler compounding layer are laminated.   The plastic blade sheet according to claim 1, wherein at least one filler blending layer is laminated on each of both side surfaces of the base layer.   3. The plastic blade sheet according to claim 1, wherein the amount of the inorganic filler in the filler blend layer is 30% by weight or more.   4. The plastic blade according to claim 1, wherein the inorganic filler is at least one selected from talc, titanium oxide, barium sulfate, calcium carbonate, and silica. 5. Sheet.   A plastic cutter comprising the sheet for a plastic cutter according to any one of claims 1 to 4.   A carton for storing a film-like object, comprising the plastic blade according to claim 5 for cutting a film-like object.

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