JP2014231358A - Package for wrap film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package for a wrap film in which a roll 2 of a wrap film 1 for food is stored and a saw-toothed metal cutting tooth 28 in which triangular convex teeth are disposed continuously for cutting the wrap film 1 drawn from the roll 2 is provided, and which allows even the wrap film 1 being a heat-resistant laminated wrap film to be smoothly cut.SOLUTION: A tooth tip angle of a metal cutting tooth 28 is 30-40°.

Description

  The present invention relates to a wrapping film packaging container that includes a wrapping film roll and includes metal cutting teeth for cutting the wrapping film drawn from the roll.

  Conventionally, as a wrap film packaging container provided with a metal cutting tooth, as disclosed in Patent Document 1, a container having a sawtooth metal cutting tooth with triangular convex teeth is known. . Further, as shown in Patent Document 2, there is also known one provided with sawtooth-like non-metallic (bulcanized fiber, resin-impregnated paper, resin) cutting teeth.

  By the way, as a wrap film for food, for example, a single-layer wrap film such as polyethylene, polyvinylidene chloride, and vinyl chloride is generally used, but recently, a heat-resistant laminated wrap film is also used. Examples of the heat resistant laminated film include a laminated film of polyethylene and polypropylene, and a laminated film of polyethylene and polyamide.

  On the other hand, when the tooth tip angle is reduced, the sawtooth-shaped metal cutting teeth are difficult to manufacture because the mold separation at the time of punching into a sawtooth shape is deteriorated. In addition, for single-layer wrap films that have been used for a long time, there is no significant change in sharpness even if the tooth tip angle is reduced, so the tip angle of the metal cutting teeth in a conventional wrap film packaging container is A relatively large angle that is easy to process, specifically 47 ° to 55 °, is the mainstream. And, for the heat-resistant laminated wrap film packaging containers that have recently been used, the same metal cutting teeth as those used for the single-layer wrap film that has been used for a long time are used. is the current situation.

Japanese Utility Model Publication No. 55-173445 JP 2008-201476 A

  However, the sawtooth-shaped metal cutting teeth in the conventional wrap film packaging container have no major problem for cutting a single-layer wrap film, but have a problem that a heat-resistant laminated wrap film is difficult to cut smoothly. Similarly, non-metallic cutting teeth have a problem that it is difficult to smoothly cut the heat-resistant laminated wrap film.

  Patent Document 1 also discloses that the tooth tip angle at both ends is made smaller than the tooth tip angle at the center of the metal cutting tooth. The tooth tip angle at both ends in Patent Document 1 is 30 °, but the tooth tip angle at the center is as large as 60 °. For this reason, even if the metal cutting teeth shown in Patent Document 1 are used in a packaging container for heat-resistant laminated wrap film, smooth cutting is hindered at this central portion, so that a good overall sharpness is obtained. Can't get.

  Patent Document 2 also discloses that when the wrap film is polyvinylidene chloride, the tip angle of the sawtooth-shaped non-metallic cutting teeth is set to 30 ° to 90 ° (see paragraph [0036]). . However, in the case of non-metal cut teeth, the convex teeth tend to bend when the tooth tip angle is small, and even with a single layer wrap film, it is difficult to maintain a good sharpness, so a heat resistant laminated wrap film that is difficult to cut smoothly Is not conceived to reduce the tooth tip angle. Incidentally, the tooth tip angle disclosed in Patent Document 2 in the example is 60 ° when the wrap film is polyvinylidene chloride.

  The present invention has been made in view of the above-described conventional problems, and relates to a wrapping film packaging container that contains a heat-resistant laminated wrap film, and a sawtooth-shaped metal cutting tooth that can smoothly cut the contained laminated wrap film. It aims at making it the packaging container for wrap films provided with.

For the above-mentioned purpose, the present invention provides a sawtooth-shaped metal cutting tooth having a triangular convex tooth for accommodating a roll of food wrap film and cutting the wrap film drawn from the roll. In the wrap film packaging container provided,
The wrap film is a heat-resistant laminated wrap film, and a tip angle of the metal cut teeth is 30 ° to 40 °, and a wrap film packaging container is provided.

In the present invention, the tip angle is 37 ° ± 1 °.
The height of the convex teeth is 0.7 mm to 1.5 mm,
It is preferable that the laminated wrap film is a laminated film of polyethylene and polypropylene as a preferred embodiment.

  In the case of serrated metal cutting teeth, the size of the tip angle does not significantly affect the sharpness for single-layer wrap films, but it has a significant effect on sharpness for heat-resistant laminated wrap films. It was made by what the inventor found.

  That is, in the present invention, since the tooth tip angle of the sawtooth-shaped metal cutting teeth is as small as 30 ° to 40 °, the sharpness with respect to the single-layer wrap film does not change so much, but the heat-resistant laminated wrap The sharpness of the film is greatly improved over conventional metal cutting teeth having a larger tip angle. Therefore, when a heat-resistant laminated wrap film is accommodated, the smooth cutting can be performed, and usability can be improved.

It is a perspective view which shows an example of the packaging container for wrap films which concerns on this invention. It is the elements on larger scale of a sawtooth-shaped metal cutting tooth.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same reference numerals indicate the same components.

  As shown in FIG. 1, a wrap film packaging container 10 according to the present invention is made of a metal for cutting a wrap film 1 drawn from a roll body 2 and a box 20 that houses a roll 2 of a wrap film 1 for food. Cutting teeth 28. A wrap film 1 is wound around a paper tube 3 to form a roll 2. However, the roll 2 without the paper tube 3 may be used.

  The food wrap film 1 accommodated as the roll 2 in the wrap film packaging container 10 of the present invention is a heat-resistant laminated wrap film. Examples of the heat-resistant laminated wrap film include polyethylene and polypropylene laminated films and polyethylene and polyamide laminated films. From the viewpoint of easily obtaining good cutting properties according to the present invention, a laminated film of polyethylene and polypropylene is preferred. These heat-resistant laminated wrap films have a heat resistance of 150 ° C. or higher, whereas the heat resistance of single-layer wrap films such as polyethylene, polyvinylidene chloride, and vinyl chloride is up to about 140 ° C. On the other hand, it is difficult to cut with a general conventional metal cutting tooth. In addition, the polymethylpentene (TPX) single-layer wrap film is a heat-resistant wrap film having a heat resistance of 150 ° C. or higher, but can be easily cut even by a general conventional metal cutting tooth. From these facts, the heat-resistant laminated wrap film is difficult to cut with a general conventional metal cutting tooth, and the metal cutting tooth 28 used in the present invention creates a cause for smooth cutting. Conceivable. In addition, in this invention, a heat resistant laminated wrap film means the laminated wrap film which has heat resistance of 145 degreeC or more.

  The box 20 is a horizontally long rectangular parallelepiped, and includes a main body 22 that houses the roll 2 and a lid body 26 that covers the main body 22 so as to be opened and closed. The main body 22 includes a front plate 22a, side plates 22b and 22c, a back plate 22d, and a bottom plate 22e. The front plate 22a, the side plates 22b and 22c, and the back plate 22d are raised from the periphery of the bottom plate 22e to form the peripheral wall of the main body 22. The lid body 26 includes a front edge plate 26 a that covers the upper outer surface side of the main body 22 when the lid body 26 is closed, side edge plates 26 b and 26 c that cover the upper outer surface side of the side plates 22 b and 22 c of the main body 22, and the main body 22. A top plate 26d covering the opening. The rear edge of the top plate 26d is connected to the upper edge of the back plate 22d of the main body 22, and the front edge plate 26a and the side edge plates 26b and 26c are connected to the front edge and the side edge of the top plate 26d, respectively. Further, the box body 20 includes metal cutting teeth 28 for cutting the wrap film 1 drawn from the roll 2.

  The metal cutting teeth 28 are made of a metal plate such as a tin-plated steel plate or an aluminum plate. With a material other than metal, it is difficult to maintain the sharpness of the tip by setting the tooth tip angle, which will be described later, and the durability of the convex teeth 30, and a good sharpness cannot be obtained.

  As shown in FIG. 2, the metal cutting teeth 28 have a saw blade shape in which triangular convex teeth 30 are connected. The tooth tip angle α is 30 ° to 40 °. If it is less than 30 °, the mold separation at the time of punching into a saw blade shape becomes worse, and the metal cutting teeth 28 are difficult to manufacture. On the other hand, if it exceeds 40 °, the force required to cut the wrap film 1 drawn from the roll 2 becomes large, and smooth cutting becomes difficult. From the viewpoint of easy manufacture of the metal cutting teeth 28 and easy cutting of the wrap film 1, the tooth tip angle α is preferably 37 ° ± 1 °. Moreover, it is preferable that the tip angle α is equal for each convex tooth 30.

  The tip of the tooth tip may be a rounded round shape instead of a sharply pointed shape. By making the tip of the tooth tip into a round shape, the mold separation at the time of punching into a saw blade shape is improved. Moreover, although a force is applied to the tip of the tooth tip during film cutting, the force relating to the tooth tip can be dispersed at that time, and the tip of the tip of the tooth can be prevented from bending.

  The height H of the convex teeth 30 is preferably 0.7 mm to 1.5 mm. When the height H is less than 0.7 mm, the number of convex teeth 30 per unit length direction of the metal cutting teeth 28 increases, and the tooth tips that come into contact with the wrap film 1 during cutting increase and the force is dispersed. Therefore, it becomes difficult to cut the wrap film 1 with a small force. If the height H exceeds 1.5 mm, the tip of each convex tooth 30 may be easily bent or chipped, and it becomes difficult to maintain a good sharpness over a long period of time.

  The metal cutting teeth 28 shown in FIG. 1 are attached downward to the front edge plate 26a of the lid body 26. However, the metal cutting teeth 28 can be disposed anywhere as long as the wrap film 1 drawn from the main body 22 can be cut. Good. For example, it can be attached upward to the front plate 22a of the main body 22, attached to the front plate 22a side of the bottom plate 22e, or can be attached to other positions. Further, as a method of attaching the metal cutting teeth 28, a caulking method, adhesion with an adhesive, or the like can be used.

Examples 1 and 2
A wrap film packaging container as shown in FIG. 1 was prepared, and the cut property of the wrap film was evaluated. Similarly to FIG. 1, the metal cutting teeth were attached to the inside of the front edge plate of the lid of the wrap film packaging container with the tip portion slightly protruding.

  The cut property was evaluated by a force necessary for cutting the film (cutting force: unit Newton). The cutting force was measured using a push-pull gauge.

  First, a wrap film packaging container containing a roll of wrap film is placed on a carton set base of the measuring instrument, and the leading end of the wrap film pulled out from the wrap film packaging container is equipped with a push-pull gauge. It was fixed to the fixing jig. Next, the whole wrapping film packaging container was rotated around the roll core of the wrapping film while fixing the lid so as not to be separated from the wrapping film packaging container. Thus, the wrap film was pressed against the metal cutting teeth, and the rotational force required to cut the wrap film with the metal cutting teeth was measured with a push-pull gauge. This was repeated 5 times for each metal cutting tooth with different tooth tip angles, and the average value was determined. The measurement results are shown in Table 1.

  The wrap film and the metal cutting teeth are as follows.

(1) Wrap film Examples 1 and 2: Heat-resistant laminated wrap film [Laminated film of polyethylene and polypropylene (width = 30 cm, length = 100 m)]

(2) Metal cutting teeth Example 1: tooth tip angle α = 40 °, tooth height H = 1.44 mm, material = tin-plated steel plate Example 2: tooth tip angle α = 37 °, tooth height H = 1.00mm, material = tin-plated steel sheet

Comparative Example 1
The same measurement was performed in the same manner as in Example 1 except that the tooth tip angle α = 47 °, the tooth height H = 1.47 mm, and the material = a metal-cutting tooth of a tin-plated steel plate. The results are shown in Table 1.

Comparative Example 2
The same measurement was performed in the same manner as in Example 1 except that a non-metallic cutting tooth composed of a tooth tip angle α = 40 °, a tooth height H = 1.40 mm, and a material = resin was used. The results are shown in Table 1.

Reference examples 1 and 2
The same measurement was performed in the same manner as in Example 1 except that the following three types of wrap films were used, the metal cutting teeth were as follows, and the number of measurements was three. The results are shown in Table 2.

(1) Wrap film Reference Example 1, 2: Single-layer wrap film [polyethylene (width = 30 cm, length = 20 m), vinyl chloride (width = 30 cm, length = 35 m), TPX (width 30 cm, length) = 3 types of 20m)]

(2) Metal cutting teeth Reference example 1: tooth tip angle α = 37 °, tooth height H = 1.00 mm, material = tin-plated steel sheet Reference example 2: tooth tip angle α = 50 °, tooth height H = 1.04 mm, Material = Tin-plated steel sheet

  1: wrap film, 2: roll, 3: paper tube, 10: wrap film packaging container, 20: box, 22: main body, 22a: front plate, 22b, 22c: side plate, 22d: back plate, 22e: Bottom plate, 26: lid, 26a: front edge plate, 26b, 26c: side edge plate, 26d: top plate, 28: metal cutting teeth, 30: convex teeth

Claims (4)

In a wrapping film packaging container having sawtooth-shaped metal cutting teeth connected with triangular convex teeth for accommodating a wrapping film roll for food and cutting the wrapping film drawn from the roll,
A wrap film packaging container, wherein the wrap film is a heat-resistant laminated wrap film, and a tip angle of the metal cut teeth is 30 ° to 40 °.   The wrap film packaging container according to claim 1, wherein the tooth tip angle is 37 ° ± 1 °.   The wrap film packaging container according to claim 1 or 2, wherein the height of the convex teeth is 0.7 mm to 1.5 mm.   The wrap film packaging container according to any one of claims 1 to 3, wherein the laminated wrap film is a laminated film of polyethylene and polypropylene.

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