TW201800199A - Cutting blade for storage container and storage container - Google Patents

Abstract

Provided are a cutting blade for a storage container and a storage container capable of satisfactorily cutting off a film while suppressing occurrence of rewinding. A cutting blade (40) is used in a storage container (10) for a packaging film (50). The cutting blade (40) comprises: a first surface attached to the storage container (10); and a second surface which is a surface on the opposite side to the first surface and which comes into contact with the packaging film (50) when the packaging film (50) is being cut off by the cutting blade (40). At least the second surface contains a roughened surface region having an arithmetic average roughness of 0.1 [mu]m or more and less than 0.4 [mu]m.

Description

Cutting blade for storage container and storage container

The present invention relates to a cutting blade for a storage container for storing a packaging film, and a storage container provided with the cutting blade.

A storage container for storing a packaging film wound into a roll shape is known. This storage container includes a main body portion and a lid portion, wherein the main body portion has a box shape opened on the upper surface and extends in one direction, and the lid portion is configured to be openable or closable with respect to the opening of the main body portion. Specifically, the main body portion includes a bottom wall portion constituting a bottom portion of the main body portion, and a peripheral wall portion erected from the bottom wall portion, and the opening is surrounded by an upper edge of the peripheral wall portion. The peripheral wall portion includes a front wall portion and a rear wall portion facing each other, and the front wall portion and the rear wall portion extend along the length direction of the main body portion. The cover portion includes an upper wall portion that extends from the upper edge of the rear wall portion of the main body portion and covers the opening when the cover portion is closed, and the extension portion extends from the upper wall portion and is closed at the cover portion. When it overlaps with the front wall. A saw blade-shaped cutting blade is attached to an end portion of the surface opposite to the front wall portion when the cover portion of the extension portion is closed, so that the blade tip protrudes from the extension portion. The packaging film is stored in a space surrounded by the main body so that the longitudinal direction of the main body is taken as the axial direction of the roll, and after being pulled out from the storage container and cut by a cutting blade, it is used for packaging of foods and the like.

When cutting the packaging film, the user of the packaging film pushes the extension portion and the cutting blade toward the front wall portion by pulling the packaging film from the extension portion and the front wall portion, so that the cutting blade penetrates the packaging film. Thereby, the packaging film is cut. Here, in the package After the film is cut off, the phenomenon that the end of the packaging film extended from the roll returns to the inside of the main body part may be called "rewinding". If rewinding occurs, the end of the packaging film is adhered to the roll in the main body portion and is difficult to identify, which may cause the user to find the end of the packaging film when the user wants to withdraw the packaging film next time.

One of the reasons for the rewinding is because the cutting blade is pressed against the packaging film when the packaging film is cut, so the end of the cut packaging film is affixed to the cutting blade. When the lid is opened with the end of the packaging film attached to the cutting blade, the end of the packaging film is lifted toward the opening of the main body together with the extension portion, and rollback easily occurs.

As one of the countermeasures for suppressing the occurrence of rewinding, for example, as in the cutting blade described in Patent Document 1, a convex portion is provided on the surface of the cutting blade to reduce the cutting blade and the packaging film when cutting the packaging film. The area of the part in contact.

In addition, Patent Document 2 discloses that by improving the smoothness of the front panel and adjusting the surface roughness of the metal plate mounted on the back of the masking sheet, the cut end portion of the film is reliably attached to the front after leaving the masking sheet. On the panel, this prevents the food packaging film from being rolled back towards the carton.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2010-269815

[Patent Document 2] Japanese Patent Laid-Open No. 3-69444

[Patent Document 3] Japanese Patent Laid-Open No. 2016-137541

Since the degree of adhesion between the packaging film and the cutting blade changes according to the surface state of the surface of the cutting blade that is in contact with the packaging film when the packaging film is cut, appropriately controlling the surface state of the above surface of the cutting blade is also a kind of suppression of rollback Countermeasures. For example, it is conceivable to make the surface state rough to suppress rewinding as in Patent Document 2, but if it is too rough, the film slips when the film is cut, and it cannot be cut smoothly.

An object of the present invention is to provide a cutting blade for a storage container and a storage container which can suppress the occurrence of rewinding and can smoothly cut a film.

The cutting blade for a storage container for solving the above-mentioned problems is a cutting blade for a storage container for a packaging film, and includes: a first surface that is mounted on the storage container surface; and a second surface that is described above A surface opposite to the first surface, and in contact with the packaging film when the packaging film is cut by the cutting blade; and at least the second surface includes an arithmetic average roughness of 0.1 μm or more and less than 0.4 μm Rough area.

The storage container for solving the above-mentioned problem is a storage container for storing a packaging film, and includes a main body portion that divides the storage space as a space for storing the packaging film and has a box shape. The main body portion is provided with the main body. A bottom wall portion of the bottom portion, and a peripheral wall portion erected from the bottom wall portion; an opening surrounded by an edge of the peripheral wall portion constitutes an end portion of the storage space; and a cover portion is configured to be opposite to The opening is opened or closed and is provided to extend from an edge of the peripheral wall portion when the cover portion is closed And covering the upper wall portion with the opening, and an extension portion further extending from the upper wall portion to overlap the peripheral wall portion; and a cutting blade, which is mounted on the extension portion when the cover portion is closed, and And the cutting blade is the cutting blade for the storage container described above.

According to the above configuration, since the surface roughness of the rough surface area is sufficiently large, even if the second surface is pressed against the packaging film when the packaging film is cut, the second surface can be prevented from being strongly adhered to the packaging film. Therefore, when the storage container is opened, the higher the packaging film is lifted together with the cover of the storage container, the more strongly the packaging film can be prevented from sticking to the cutting blade, so that the packaging film can be prevented from being rolled back and cut smoothly. Breaking film.

In the above-mentioned storage container cutting blade, it may be formed that the rough surface area has a shear adhesion strength of 10 gf or less with respect to a packaging film made of polyvinylidene chloride; the shear adhesion strength is for a plurality of The average value of the minimum force measured by the object with the rough surface area, wherein the minimum force means: the 25 mm wide packaging film is adhered to the object, at 22 ° C, 31% In an RH environment, at a test speed of 300 mm / min, when the object and the packaging film are directed in opposite directions, and pulled relative to the horizontal direction of the adhesion surface of the two, the packaging film is made relative to The minimum force required for the object to move.

In the cutting blade for a storage container, the gloss of the rough surface area may be less than 40%.

According to the above-mentioned configuration, it is possible to appropriately suppress the rewinding of the packaging film and smoothly cut the film.

The cutting blade for a storage container may contain a polyester resin as a main component.

According to the above configuration, it is easy to realize a cutting blade having sufficient cutting performance and having a second surface including the rough surface region.

In the storage container described above, a sliding suppressing portion may be provided at a position opposed to the extending portion when the lid portion of the peripheral wall portion is closed.

According to the said structure, since a sliding of a packaging film with respect to a peripheral wall part at the time of cutting a packaging film can be suppressed by a slip suppression part, a packaging film can be cut easily. In addition, as described above, it is possible to suppress the packaging film from slipping, thereby suppressing the packaging film from being rolled back.

According to the present invention, the packaging film stored in the storage container can be prevented from being rolled back, and the film can be cut smoothly. Other aspects and advantages of the present invention will become clearer with reference to the drawings showing examples of the technical idea of the present invention on the basis of the following description.

10‧‧‧Storage Container

20‧‧‧Main body

21‧‧‧ front wall

22‧‧‧ rear wall

23‧‧‧ bottom wall

24‧‧‧ sidewall

25‧‧‧Slip suppression section

30‧‧‧ Cover

31‧‧‧ Upper wall

32‧‧‧ extension

32a‧‧‧ leading edge

33‧‧‧ horizontal wall section

40‧‧‧ cutting blade

40F‧‧‧First side

40S‧‧‧Second Side

50‧‧‧Packaging film

S‧‧‧Storage space

FIG. 1 is a perspective view of one embodiment of a storage container, and shows a three-dimensional structure of the storage container in a closed state with the extracted packaging film and a user's hand.

FIG. 2 is a perspective view of a storage container according to an embodiment, and shows a three-dimensional structure of the storage container in a state where the lid portion is opened together with the extracted packaging film.

FIG. 3 is an embodiment of a cutting blade, and is a top view showing a planar structure of the cutting blade.

One embodiment of the storage container cutting blade and the storage container will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing a storage container in a closed state together with the extracted packaging film and a user's hand withdrawing the packaging film, and FIG. 2 is a diagram showing a storage container in an opened state together with the extracted packaging film.

As shown in FIG. 1, the storage container 10 includes a main body portion 20, a lid portion 30, and a cutting blade 40, and has a substantially rectangular parallelepiped shape extending in one direction when the lid portion 30 is closed.

The main body portion 20 has a box shape with one surface opened. Specifically, the main body portion 20 includes a front wall portion 21, a rear wall portion 22, a bottom wall portion 23, and two side wall portions 24. The bottom wall portion 23 constitutes the bottom of the main body portion 20, and the front wall portion 21, the rear wall portion 22, and the side wall portion 24 constitute a peripheral wall portion that is erected from the bottom wall portion 23. In addition, in FIGS. 1 and 2, the front end of the peripheral wall portion extending from the bottom wall portion 23 with respect to the bottom wall portion 23 is based on the state in which the storage container 10 is arranged so that the bottom wall portion 23 is in contact with the horizontal plane. The upper side is described, and the side where the bottom wall portion 23 is located with respect to the front end of the peripheral wall portion will be described as the lower side. That is, the main body portion 20 extends in a left-right direction in a direction parallel to the horizontal plane, and opens in a direction perpendicular to the horizontal plane, that is, in a direction above and below the vertical direction.

The front wall portion 21 has a substantially rectangular plate shape extending in the left-right direction, and the rear wall portion 22 and the bottom wall portion 23 also have substantially the same plate shape as the front wall portion 21. Front wall 21 and The rear wall portion 22 is opposed to the direction parallel to the horizontal plane and perpendicular to the left-right direction, that is, the front-rear direction. The bottom wall portion 23 is located between the front wall portion 21 and the rear wall portion 22, and one edge of the bottom wall portion 23 in the front-rear direction is connected to the lower edge of the front wall portion 21, and the other of the bottom wall portion 23 is in the front-rear direction. The side edge is connected to the lower edge of the rear wall portion 22.

The two side wall portions 24 have a substantially rectangular plate shape that is substantially the same as each other, and are opposed to each other in the left-right direction. One side wall portion 24 of the two side wall portions 24 in front and rear directions and the lower edge are connected to one side edge in the left-right direction of the front wall portion 21, the rear wall portion 22, and the bottom wall portion 23. The other edges and the lower edges of the other side wall portion 24 in the front-rear direction are connected to the other side edges in the left-right direction of the front wall portion 21, the rear wall portion 22, and the bottom wall portion 23.

The cover portion 30 is configured to be openable or closable with respect to the opening, and includes an upper wall portion 31, an extension portion 32, and two lateral wall portions 33. The upper wall portion 31 has a substantially rectangular plate shape that is substantially the same as the bottom wall portion 23 and extends from the upper edge of the rear wall portion 22. When the lid portion 30 is closed, the upper wall portion 31 covers the opening and faces the bottom wall portion 23 in the up-down direction.

The extension portion 32 is plate-shaped and extends from the edge of the upper wall portion 31 opposite to the edge connected to the upper edge of the rear wall portion 22. When the cover portion 30 is closed, the extension portion 32 is outside the main body portion 20 and the front wall. One of the portions 21 partially overlaps. The extension portion 32 has a shape in which the width in the vertical direction in the state where the cover portion 30 is closed is the largest in the center portion in the left-right direction. In other words, the lower edge of the extension portion 32 in the state where the lid portion 30 is closed, that is, the leading edge 32a, is bent in a state where the center portion is closer to the bottom wall portion 23 than the both end portions in the left-right direction.

The two lateral wall portions 33 have a substantially rectangular plate shape that is substantially the same as each other. When the cover portion 30 is closed, an upper edge of one of the two horizontal wall portions 33 is connected to one edge in the left-right direction of the upper wall portion 31, and one edge of the horizontal wall portion 33 in the front-back direction is connected to One edge in the left-right direction of the extending portion 32 overlaps. Further, when the cover portion 30 is closed, one of the two lateral wall portions 33 overlaps a portion of one of the side wall portions of the side wall portion 24 outside the main body portion 20. In addition, when the cover portion 30 is closed, the upper edge of the other lateral wall portion of the two lateral wall portions 33 is connected to the other lateral edge of the upper wall portion 31 in the left-right direction, and the lateral wall portion 33 is oriented forward and backward. One side edge of is overlapped with the other side edge in the left-right direction of the extension portion 32. Furthermore, when the cover portion 30 is closed, the other lateral wall portion of the two lateral wall portions 33 partially overlaps with one of the other side wall portions of the side wall portion 24 outside the main body portion 20.

The cutting blade 40 is a plate-shaped blade having a plurality of blade tips arranged in a saw blade shape. The cutting blade 40 is mounted on the end of the surface opposite to the front wall portion 21 when the cover portion 30 of the extension portion 32 is closed along the front edge 32a so that a plurality of blade points protrude from the front edge 32a of the extension portion 32. The cutting blade 40 has a shape in which the center portion is curved closer to the bottom wall portion 23 than the left and right end portions in a state where the lid portion 30 is closed.

As shown in FIG. 2, the cover portion 30 is configured to be able to rotate relative to the main body portion 20 as an axis between a boundary portion of the upper wall portion 31 and the rear wall portion 22, and the cover portion 30 is opened or closed by rotating the cover portion 30.

In a state where the cover portion 30 of the front wall portion 21 is closed, a sliding suppression portion 25 is provided at a position opposite to the extension portion 32. The slip suppressing portion 25 has a function of suppressing the packaging film 50 from sliding relative to the outer side surface of the front wall portion 21. That is, the slip suppressing section 25 is located in front. The adhesiveness between the outer surface of the wall portion 21 and the packaging film 50 is higher than that of the portion other than the sliding suppressing portion 25, and is formed by applying a varnish such as UV varnish or a resin film. In addition, the slip suppression portion 25 may be provided in the front wall portion 21 in the length direction of the front wall portion 21, that is, in the entire width of the left-right direction, or may be provided at intervals along the length direction, or may be provided in the length direction. On one part.

In addition, the front wall portion 21 may be provided with a flap, and a slip suppressing portion 25 may be provided on the flap, wherein the flap is formed by cutting away a part of the front wall portion 21 and is configured from the front wall portion 21 The other portions are raised toward the outside of the main body portion 20.

The main body portion 20 defines a storage space S for storing the packaging film 50, that is, a space surrounded by the front wall portion 21, the rear wall portion 22, the bottom wall portion 23, and the two side wall portions 24 is a storage space S. The opening of the main body portion 20 is surrounded by the upper edge of the front wall portion 21, the upper edge of the rear wall portion 22, and the upper edge of each side wall portion 24, that is, the edge of the peripheral wall portion opposite to the bottom wall portion 23, and The end of the storage space S is configured.

The packaging film 50 is wound around, for example, a paper tube having a cylindrical shape and formed into a roll shape, and is stored in the storage space S such that the axial direction of the roll is a left-right direction. The size of each wall portion constituting the main body portion 20 may be a storage space S capable of dividing the size of the roll of the packaging film 50 to be stored, into a size capable of accommodating the roll.

The main body portion 20 and the cover portion 30 are formed by bending a sheet of thick paper, for example. Each of the wall portion and the extension portion 32 may be a laminated body formed by laminating a plurality of plate-shaped members, or may be made of a material other than paper made of a resin other than thick paper. Cutting knife The sheet 40 is mounted on the extension portion 32 by, for example, arranging a sealing material or an adhesive layer between the extension portion 32 and the cutting blade 40 and performing ultrasonic bonding. In addition, the tip of the cutting blade 40 may be exposed from the extension portion 32 when the packaging film 50 is used, and may be covered with other members when the storage container 10 storing the packaging film 50 is stored or transported.

Examples of a constituent material of the packaging film 50 include polyvinylidene chloride.

When using the packaging film 50 stored in the storage container 10 configured as described above, the user, for example, withdraws the packaging film 50 from between the extension portion 32 and the front wall portion 21 with one hand, grasps the front end thereof, and uses the other Hold the storage container 10 with the lid 30 closed with one hand, and press the central portion of the extension portion 32 with the thumb to rotate the storage container 10 in the direction shown by the arrow A in FIG. 1. Thereby, the blade of the cutting blade 40 penetrates the packaging film 50, and the packaging film 50 is cut. At this time, the packaging film 50 is sandwiched between the cutting blade 40 and the front wall portion 21.

A detailed configuration of the cutting blade 40 will be described with reference to FIG. 3.

As shown in FIG. 3, the cutting blade 40 has a shape that extends in a band shape and corresponds to the front end edge 32 a of the extension portion 32, that is, a substantially V-shape. By making the cutting blade 40 have a substantially V shape, the cutting edge of the cutting blade 40 can easily penetrate the center portion in the width direction of the packaging film 50, and thus the packaging film 50 can be easily cut.

In addition, the cutting blade 40 may have a shape extending linearly, as long as the front end edge 32 a of the extension portion 32 extends in the left-right direction as a whole according to the shape of the cutting blade 40.

The cutting blade 40 has a first surface 40F and a second surface 40S, wherein the first surface 40F refers to a surface opposite to the front wall portion 21 when the cover portion 30 of the extension portion 32 is closed when the cover portion 30 of the extension portion 32 is closed. The upper surface and the second surface 40S refer to a surface on the opposite side to the first surface 40F, and are opposed to the outer side surface of the front wall portion 21 when the cover portion 30 is closed. The second surface 40S is a surface that comes into contact with the packaging film 50 when the packaging film 50 is cut.

Hereinafter, characteristics showing the surface properties of the second surface 40S will be described.

Regarding the surface roughness of the second surface 40S, the arithmetic average roughness Ra is preferably 0.1 μm or more and less than 0.4 μm, and more preferably 0.15 μm or more and 0.3 μm or less. The maximum height Rz of the second surface 40S is preferably 1.0 μm or more and 2.5 μm or less. The arithmetic average roughness Ra and the maximum height Rz are values measured by a method based on JIS B 0601: 2001.

When the arithmetic average roughness Ra is 0.1 μm or more and less than 0.4 μm, the second surface 40S is rough, and even if the second surface 40S is pressed against the packaging film 50 when the packaging film 50 is cut, the second surface can be suppressed. 40S is strongly adhered to the packaging film 50. Therefore, when the lid portion 30 is opened, the higher the packaging film 50 is lifted together with the extension portion 32, the more strongly the packaging film 50 can be prevented from sticking to the cutting blade 40, and the packaging film 50 can be prevented from being rolled back.

In addition, if the degree of adhesion between the cutting blade and the packaging film is too small, the packaging film will slide when the packaging film is cut, making it difficult to cut the packaging film. When the arithmetic average roughness Ra of the surface of the cutting blade that is in contact with the packaging film is less than 0.4 μm, the surface of the cutting blade will not be too rough, so the sliding of the packaging film can be suppressed.

In addition, the gloss of the second surface 40S is preferably less than 40%, and more preferably 35% or less. Gloss is a value measured by a parallel light method based on "Mirror Gloss-Measurement Method" based on JIS Z 8741: 1997.

When the gloss of the second surface 40S is less than 40%, the second surface 40S is rough, and even if the second surface 40S is pressed against the packaging film 50 when the packaging film 50 is cut, the strong adhesion of the second surface 40S can be suppressed. On the packaging film 50. Therefore, when the lid portion 30 is opened, the higher the packaging film 50 is lifted together with the extension portion 32, the more strongly the packaging film 50 can be prevented from sticking to the cutting blade 40, and the packaging film 50 can be prevented from being rolled back.

The adhesion strength and shear adhesion strength of the second surface 40S and the packaging film 50 are preferably 10 gf or less, and more preferably 5 gf or less. The shear adhesion strength is an index indicating the adhesion strength between a packaging film and an object, and is a value measured by a method based on "Test Methods for Tapes and Adhesive Sheets" based on JIS Z-0237: 2009.

Specifically, the shear adhesion strength refers to the average value of the minimum force measured on a plurality of objects, wherein the minimum force refers to a packaging film made of 25 mm wide polyvinylidene chloride through pressure. The minimum force required to move the packaging film relative to the object when the packaging film and the object are directed in opposite directions and pulled horizontally relative to the adhesion surface. The measurement was performed using a packaging film with a width of 25 mm and under conditions of 22 ° C and 31% RH at a test speed of 300 mm / min.

In the case where the characteristics showing the surface properties of the second surface 40S satisfy the above-mentioned conditions, the second surface 40S is rough, even when the second surface is cut when the packaging film 50 is cut. 40S pressing on the packaging film 50 can also inhibit the second surface 40S from being strongly adhered to the packaging film 50. Therefore, when the lid portion 30 is opened, the higher the packaging film 50 is lifted together with the extension portion 32, the more strongly the packaging film 50 can be prevented from sticking to the cutting blade 40, and the packaging film 50 can be prevented from being rolled back.

Regarding the surface property of the first surface 40F, as long as it can be properly bonded to the extension portion 32, its characteristics are not particularly limited. The characteristics indicating the surface properties of the first surface 40F may be the same as or different from the characteristics indicating the surface properties of the second surface 40S.

The constituent material of the cutting blade 40 is not particularly limited, and the cutting blade 40 may be made of, for example, resin or metal. In order to realize the second surface 40S whose surface characteristics meet the above conditions, it is preferable that the main component of the cutting blade 40 contains resin and contains additives, and the surface of the cutting blade 40 is adjusted according to the type and amount of the additive. Surface properties. In addition, the main component of the cutting blade 40 refers to a component having the highest content rate among the components constituting the cutting blade 40, for example, a component having a content rate of 50% by weight (mass percentage) or more in the cutting blade 40.

Examples of the resin as the main component of the cutting blade 40 include polyester resins such as polylactic acid, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, and PEEK (polyetheretherketone) resin. , PES (polyethersulfone) resin, etc. Among them, the main component of the cutting blade 40 is preferably a polyester resin.

It does not specifically limit as an additive which can be used. Examples include resins such as olefin resins, polystyrene resins, acrylic resins, amorphous polyester resins, amorphous polyamide resins, polycarbonate resins, or barium sulfate and carbonic acid. Inorganic materials such as calcium, titanium dioxide, silica, and talc.

In addition, the second surface 40S that satisfies the above-mentioned conditions may be formed by applying laser processing, floating press processing, powder coating, or the like to the cutting blade 40.

A more specific example of the cutting blade 40 is a film cutter described in Patent Document 3.

In addition, the above-mentioned embodiment may be modified and implemented as follows.

￭ The characteristics of the surface properties of the second surface 40S of the cutting blade 40 as a whole may not satisfy all the conditions described in the above embodiment. In the case where the second surface 40S has a structure including a rough surface area that satisfies the conditions described in the above embodiment, the packaging film 50 and The degree of adhesion of the cutting blade 40 is weak, so that the wrapping film 50 can be suppressed from being rolled.

In addition, the rough surface area may be set within the entire width range of the cutting blade 40 or may be set within a part of the width range of the cutting blade 40. When it is set within a partial width range, it is preferably provided at least at the center portion in the longitudinal direction of the cutting blade 40, and the portion other than the rough surface area of the second surface 40S is preferably smoother than the rough surface area. The central portion preferably extends uniformly from the center in the longitudinal direction of the cutting blade 40 toward both sides thereof, and the length in the longitudinal direction of the cutting blade 40 is 5% or more and 50% or less of the total length of the cutting blade 40. With such a configuration, when the packaging film 50 is cut through the second surface 40S, the center portion of the packaging film 50 can be particularly strongly pressed to prevent the packaging film 50 from sticking to the cutting blade 40 and to pass through the center portion. Ministry of The component suppresses the packaging film 50 from sliding with respect to the cutting blade 40. Therefore, it is possible to appropriately cut the packaging film 50 and suppress occurrence of rewinding.

[Example]

The above-mentioned cutting blade and storage container will be described using specific examples and comparative examples.

<Example 1>

A cutting blade having a main component of polylactic acid, a thickness of about 250 μm, and an arithmetic average roughness of 0.1627 μm was prepared.

<Example 2>

A cutting blade having a main component of polylactic acid, a thickness of about 250 μm, and an arithmetic average roughness of 0.1732 μm was prepared.

<Example 3>

A cutting blade having a main component of polylactic acid, a thickness of about 250 μm, and an arithmetic average roughness of 0.2989 μm was prepared.

<Example 4>

A cutting blade having a main component of polylactic acid, a thickness of about 250 μm, and an arithmetic average roughness of 0.1915 μm was prepared.

<Comparative example 1>

A cutting blade having a main component of polylactic acid, a thickness of about 250 μm, and an arithmetic average roughness of 0.0501 μm was prepared.

<Evaluation of Surface Properties>

As the evaluation of the surface properties of the cutting blades of Examples 1 to 4 and Comparative Example 1, the following items were evaluated.

(Surface roughness)

According to JIS B 0601: 2001, SURFCOM 1500DX2 (contact type) manufactured by Tokyo Precision Co. was used, and the arithmetic average roughness Ra and the maximum height Rz were measured under the following conditions.

˙The measured length is 4.0mm in the direction (length direction) perpendicular to the width direction of the cutting blade

˙ Cut-off wavelength 0.8mm

˙Measurement range ± 64.0μm

˙Measuring speed 0.15mm / s

˙ Cutoff type Gauss

˙Tilt correction least squares straight line correction

˙ Stylus radius 2μmR

˙Stylus material diamond

˙Measuring force 0.75mN

(Gloss)

For each of the examples and comparative examples, five samples each having a size of 7.5 mm wide by 25 mm long were prepared, and a gloss meter (VG2000) manufactured by Nippon Denshoku Kogyo Co., Ltd. was used to determine the "mirror gloss- "Measurement method" parallel light method, the gloss of each sample was measured at an incidence angle of 60 °. At this time, the two directions of the case where the alignment direction of the light source and the receiver are the direction corresponding to the width direction of the cutting blade and the case where the direction of the alignment of the light source and the receiver are the direction corresponding to the length direction of the cutting blade measuring. Regarding each example and comparative example, the average value of the glossiness of five samples was calculated for each measurement direction, and the calculated value was made into the glossiness of each example and comparative example.

(Shear adhesion strength)

In each of Examples and Comparative Examples, five samples each having a size of 7 mm wide by 25 mm long were prepared, and the shear adhesion strength was measured for each sample according to the following procedure. For each example and comparative example, the average value of the shear adhesion strength of five samples was calculated, and the calculated value was made into the shear adhesion strength of each Example and a comparative example.

(1) Use double-sided tape to adhere the sample to the surface of the iron plate.

(2) Cover the part of the iron plate that is not adhered to the sample with paper that has not been polished on the surface to prevent the packaging film from sticking on it, and arrange a 25mm wide packaging film on the sample. In addition, since the surface that comes into contact with the cutting blade when cutting the packaging film is the surface that faces the outside of the roll, it is prepared in such a way that the surface is in contact with the sample. Set the packaging film. As the packaging film, a packaging film made of polyvinylidene chloride and having passed 10 months from production was used.

(3) A non-woven cloth (for example, Kimwipes (registered trademark)) is used to rub the packaging film on the sample so that the sample and the packaging film are pressed together.

(4) Set the sample and packaging film in a TENSILON universal material testing machine (RTG-1210) manufactured by A & D, and set the sample and packaging film at a test environment of 22 ° C and 31% RH and a test speed of 300 mm / min. Pull in a direction that is horizontal to its adhesive surface, and find the force applied when moving the packaging film relative to the sample. The angle formed by the pulling direction of the sample and the packaging film is 180 °.

<Evaluation Results>

The measurement results of the surface roughness, gloss, and shear adhesion strength of Examples 1 to 4 and Comparative Example 1 are shown in Table 1.

As shown in Table 1, compared with Comparative Example 1 in which the arithmetic average roughness Ra is less than 0.1 μm, Examples 1 to 4 having an arithmetic average roughness Ra of 0.1 μm or more are small in gloss and have large shear adhesive strength. reduce. Specifically, the examples The gloss of 1 to Example 4 is less than 40% in any of the width direction and the length direction of the cutting blade, and the shear adhesion strength of Examples 1 to 4 is 10 gf or less.

<Evaluation of the frequency of rewinding>

A main body portion and a cover portion formed of coated cardboard were prepared, and the cutting blades of Examples 1 to 4 were mounted on the cover portion by ultrasonic bonding to form storage containers, and three samples of the storage containers were prepared. Similarly, three samples of the storage container to which the cutting blade of the comparative example 1 was attached were produced. Then, a packaging film made of polyvinylidene chloride and 8 months after production was stored in a storage container for each sample. For each sample, the operation of pulling the packaging film out of the storage container and cutting it off was performed 100 times. It was measured that the packaging film adhered to the cutting blade when the cover was opened, and that one end of the packaging film was from the front wall to the other end. Raised times. In addition, the above-mentioned test was performed in a state where the sliding suppressing portion of the storage container was covered by the repair tape and was unable to function as the sliding suppressing portion.

Table 2 shows the average value of the number of times the packaging film of each of the three samples of Examples 1 to 4 and Comparative Example 1 was lifted.

As can be seen from Table 2, when the storage container provided with the cutting blades of Examples 1 to 4 is used compared with the case where the storage container provided with the cutting blades of Comparative Example 1 is used, the number of times the packaging film is raised is large. cut back.

<Evaluation of Cutting Force>

In the same manner as the evaluation of the frequency of rewinding, one storage container using the cutting blades of Examples 1 to 4 and Comparative Example 1 was prepared, and samples of the storage containers were obtained. The food packaging film made of polyvinylidene chloride stored in the container was cut 200 times under a normal temperature storage environment (23 ° C, 50% RH) using a monitor, and the cutting force at this time was measured. A case where the cutting force is 5.35 N or less is represented as O, and is shown in Table 3.

As can be seen from Table 3, the cutting force is 5.35 N or less, as in Comparative Example 1 having high shear adhesion strength. From this, it can be seen that the cutting performance of the cutting blades of Examples 1 to 4 is also good.

Therefore, in the case of a cutting blade having an arithmetic average roughness Ra of 0.1 μm or more on the surface in contact with the packaging film, the cutting blade can be strongly prevented from sticking to the packaging film, and the packaging film can be prevented from being rolled back. In addition, when the shear adhesion strength or gloss is used to indicate the surface properties, the cutting blade with a shear adhesion strength of 10 gf or less on the surface in contact with the packaging film, and the gloss of the surface in contact with the packaging film is less than 40%. The cutting blade can suppress the wrapping of the packaging film.

In addition, if the degree of adhesion between the cutting blade and the packaging film is too small, the packaging film will slide when the packaging film is cut, making it difficult to cut the packaging film. When the arithmetic average roughness Ra of the surface of the cutting blade that is in contact with the packaging film is less than 0.4 μm, the surface of the cutting blade will not be too rough, so the sliding of the packaging film can be suppressed.

As shown in Examples 1 to 4, the adhesion between the cutting blade and the packaging film made of polyvinylidene chloride can be reduced.

As described above with reference to the examples, according to the cutting blade and the storage container of the above embodiment, the following effects can be obtained.

(1) In a configuration in which the arithmetic average roughness Ra of the second surface 40S in contact with the packaging film 50 when the packaging film 50 is cut by the cutting blade 40 is 0.1 μm or more and less than 0.4 μm, the second surface 40S is rough, even if When the packaging film 50 is cut, pressing the second surface 40S against the packaging film 50 can also prevent the second surface 40S from being strongly adhered to the packaging film 50. Therefore, when the lid portion 30 is opened, the higher the packaging film 50 is lifted together with the extension portion 32, the more strongly the packaging film 50 can be prevented from sticking to the cutting blade 40, and the packaging film 50 can be prevented from being rolled back.

(2) In a configuration in which the second surface 40S of the cutting blade 40 has a shear adhesion strength of 10 gf or less with respect to a packaging film made of polyvinylidene chloride, it is possible to suppress cutting of the packaging film in the same manner as in (1) above. At 50 o'clock, the second surface 40S is strongly adhered to the packaging film 50, so that the packaging film 50 can be prevented from being rolled back.

(3) In a configuration in which the gloss of the second surface 40S of the cutting blade 40 is less than 40%, the second surface 40S can be strongly prevented from sticking to the packaging film 50 when the packaging film 50 is cut, as in the above (1). Rewinding of the packaging film 50 can be suppressed.

(4) In a configuration in which the cutting blade 40 includes a polyester resin as a main component, it is easy to realize a cutting blade having a second surface 40S that has sufficient cutting performance and satisfies the conditions related to the surface properties described above.

(5) When the cover 30 of the front wall portion 21 is closed and the sliding suppressing portion 25 is provided at a position opposite to the extending portion 32, the sliding suppressing portion 25 can suppress the cutting of the packaging film 50 with respect to the packaging film 50. Since the front wall portion 21 slides, it is easy to cut the packaging film 50 and good cutting performance can be obtained. In addition, it is possible to suppress the packaging film 50 from sliding with respect to the front wall portion 21 through the slip suppressing portion 25, and thereby to prevent the packaging film 50 from being rolled back.

The invention can also be embodied in other unique ways without departing from the technical idea thereof, which is obvious to those skilled in the art. For example, a part of the features described in the embodiment (or one or more aspects thereof) may be omitted, or a plurality of features may be combined. The scope of the present invention should refer to the accompanying patent application scope, and the entire scope of equivalent items that can be entitled to rights is determined as the patent application scope.

10‧‧‧Storage Container

20‧‧‧Main body

21‧‧‧ front wall

22‧‧‧ rear wall

23‧‧‧ bottom wall

24‧‧‧ sidewall

30‧‧‧ Cover

31‧‧‧ Upper wall

32‧‧‧ extension

32a‧‧‧ leading edge

33‧‧‧ horizontal wall section

40‧‧‧ cutting blade

50‧‧‧Packaging film

Claims (6)

A cutting blade for a storage container, which is a cutting blade for a storage container for a packaging film, comprising: a first surface that is mounted on the storage container; and a second surface that is the first The surface on the opposite side of the surface is in contact with the packaging film when the packaging film is cut by the cutting blade, and at least the second surface includes a rough surface area having an arithmetic average roughness of 0.1 μm or more and less than 0.4 μm. The cutting blade for a storage container according to claim 1, wherein the rough surface area has a shear adhesion strength of 10 gf or less relative to a packaging film made of polyvinylidene chloride, and the shear adhesion strength is An average value of the minimum force measured by a plurality of objects having the rough surface area, wherein the minimum force refers to: the 25 mm wide packaging film is adhered to the object, at 22 ° C, In an environment of 31% RH, at a test speed of 300mm / min, when the object and the packaging film are directed in opposite directions and pulled in a direction horizontal to the adhesion surface of the two, make the packaging film The minimum force required to move relative to the object. The cutting blade for a storage container according to claim 1, wherein the gloss of the rough surface area is less than 40%. The cutting blade for a storage container according to claim 1, wherein the cutting blade contains a polyester resin as a main component. A storage container for storing a packaging film, comprising: a main body portion which is divided into a storage space as a space for storing the packaging film and has a box shape; and the main body portion includes a bottom portion constituting the main body portion. A bottom wall portion and a peripheral wall portion erected from the bottom wall portion, and an opening surrounded by an edge of the peripheral wall portion constitutes an end portion of the storage space; a cover portion is configured to be able to be opposite to the opening It is opened or closed, and includes an upper wall portion that extends from an edge of the peripheral wall portion to cover the opening when the cover portion is closed, and an extension portion that further extends from the upper wall portion and overlaps the peripheral wall portion. And a cutting blade mounted on an end portion of a surface opposite to the peripheral wall portion when the cover portion of the extension portion is closed, the cutting blade is a cutting for a storage container according to the scope of patent application 1 blade. The storage container according to claim 5, wherein the cover portion of the peripheral wall portion is provided at a position opposed to the extension portion when the cover portion is closed, and a slip suppressing portion is provided.