JP4921067B2 - Plastic cap and product or container using the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a plastic cap that is easy to open and has a product or container that is sealed with the plastic cap, with a knurl composed of a plurality of ridges on the surface, less pain in the hand, and less slipping of the hand.

Conventionally, in order to facilitate the opening of the plastic cap of a beverage container, a knurled line with unevenness or protrusions for preventing slipping has been applied to the outer peripheral surface (for example, Patent Documents 1 to 8). reference.).
JP 2006-1600 A JP 2005-178828 A JP 2004-284615 A JP 2004-291979 A Japanese Patent Laid-Open No. 2004-352312 JP 2004-196383 A Noto 3109446 gazette Noto 3090852 gazette

  The plastic cap knurl preferably has a high frictional resistance against the surface of the hand in order to exert an anti-slip effect. For this reason, it is preferable that the convex part of the knurl is easily sized on the hand surface, and that the contact area between the concavo-convex surface of the knurl and the hand surface is large. However, if the knurls of the knurl bite into the surface of the hand, you will feel pain when opening the plastic cap, so it will be difficult to open the plastic cap even if hand slipping is suppressed. There's a problem.

  On the other hand, in order to reduce the pain of the hand, if the convex part of the knurl does not bite into the surface of the hand, the frictional resistance of the knurl against the surface of the hand becomes small. For this reason, when the plastic cap is squeezed, there is a problem that the hand slips even if the pain of the hand is suppressed and it is difficult to open the plastic cap. In particular, when opening the plastic cap, if the hand is wet or the surface of the plastic cap is condensed, the frictional resistance of the plastic cap against the hand decreases due to the influence of water. Become.

  The present invention has been made in view of the above circumstances, and it has been found that the causes of difficulty in opening are two factors: hand pain and difficulty in slipping of the hand. That is, an object of the present invention is to provide a plastic cap that is easy to open because there is little pain in the hand and it is difficult to slip.

  In order to achieve the above object, the present invention is characterized in that a region having a high anti-slip effect and a region in which pain is hardly felt in the hand are arranged in the circumferential direction of the trunk portion.

Specifically, the plastic cap according to the present invention includes a top plate portion and a cylindrical body portion depending from the periphery of the top plate portion, and from the top plate portion to a peripheral end portion of the body portion. A plastic cap serving as a lid of a container having a knar made of a plurality of ridges extending in the direction toward the outer periphery of the body portion, and the ridges are installed at equal intervals along the circumferential direction of the body portion. A plurality of regions are provided in the circumferential direction of the body portion, the intervals between the ridges in the adjacent regions are different , and the zenith portion of the ridges is outside the outer peripheral surface of the body portion And the radius of curvature of the top of the ridge is smaller than the radius of curvature of the top plate .

  In the plastic cap according to the present invention, it is preferable that four, six, or eight regions are provided, and the widths of the regions in the circumferential direction of the body portion are made equal. Since the area is four, six, or eight and the width of the area in the circumferential direction of the body portion is equal, an area having a high anti-slip effect and an area in which pain is not easily felt in the hand are from 10 mm. They can be alternately arranged in the circumferential direction of the body portion with a width of an area of about 30 mm. The length of the abdomen of the index finger or thumb tip is typically about 10 mm to 30 mm, and the width of the webbed portion between the thumb and forefinger is typically about 10 mm to 30 mm. For this reason, the region having a high anti-slip effect and the region in which it is difficult for the hand to feel pain can be arranged with a width suitable for the standard size of the human hand.

  In the plastic cap according to the present invention, the interval between the ridges is 1.5 mm or more and 1.6 mm or less, or 0.7 mm or more and 0.8 mm or less, and the ridges are installed with 1.5 mm or more and 1.6 mm or less. It is preferable that the area | region and the area | region where the said protruding item | line is installed by 0.7 mm or more and 0.8 mm or less are alternately arrange | positioned in the circumferential direction of the said trunk | drum part. If the interval between the ridges is 1.5 mm or more and 1.6 mm or less, a knar having a high anti-slip effect is obtained. If the interval between the ridges is 0.7 mm or more and 0.8 mm or less, the knurl is less likely to cause pain in the hand.

In the plastic cap which concerns on this invention, it is preferable that the peripheral edge part side of the said trunk | drum of the said protruding item | line has shifted | deviated to the opening direction rather than the said top-plate part side of the said protruding item | line. Since the peripheral end side of the ridge is displaced in the opening direction, it is possible to efficiently pressurize in the direction along the thread of the plastic cap. Since it can pressurize efficiently along a thread, even if it is a field where the interval of ridges is narrow, a hand is hard to slip. Furthermore, in the plastic cap according to the present invention , the region 1 in which the direction of the ridges is parallel to the central axis of the body part, and the direction of the ridges, the peripheral end side of the body part is the ridges. It is preferable to arrange | position the area | region 1 and the area | region 2 in the position which adjoins the area | region 2 which is the direction shifted | deviated to the opening direction rather than the said top-plate part side.

  The product or container according to the present invention is sealed with the plastic cap according to the present invention. By being sealed with the plastic cap according to the present invention, it is possible to provide a container that is easy to open because there is little hand pain at the time of opening and it is difficult to slip. Moreover, the product accommodated in the container which is easy to open can be provided because there is little pain of a hand and it is hard to slip.

  According to the present invention, a plurality of regions in which the ridges are installed at equal intervals along the circumferential direction of the body part are provided in the circumferential direction of the body part, and the ridges in the regions adjacent to each other are provided. Since the intervals are different, the area where the anti-slip effect is high and the area where the hand does not feel pain are placed in the circumferential direction of the torso to maintain the anti-slip effect and the hand when opening the cap Pain can be reduced. Accordingly, it is possible to provide a plastic cap that is easy to open due to less hand pain and is difficult to slide, and a product or container sealed with the plastic cap.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment.

  FIG. 1 is a schematic front view of a plastic cap according to the present embodiment. The plastic cap 10 includes a top plate portion 11 and a cylindrical body portion 12 that hangs down from the periphery of the top plate portion 11, and serves as a lid of the container 30. Further, the plastic cap 10 is provided with a knurl 14 composed of a plurality of ridges 13 on the outer peripheral surface of the body portion 12. A band portion 15 is provided at the peripheral end portion 16 of the body portion 12.

  A container 30 shown in FIG. 1 has an accommodating portion 31 and an opening 32, and the opening 32 is sealed with a plastic cap 10. For example, products containing beverages such as carbonated beverages, soft drinks, beer or sparkling wine are accommodated in the accommodating portion 31. The container 30 may be formed from any material. The material of the container 30 is, for example, a metal material such as aluminum or steel, a plastic material such as polyethylene terephthalate (PET), or a glass material. In addition, the material of the container 30 is limited by the liquid filled in the container 31. For example, if the container 30 is for beverages, it is preferable that the material of the container 30 is inactive with respect to the beverage filled in the container 31 from the viewpoint of maintaining the quality of the beverage. Furthermore, the container 30 preferably has a gas barrier property such as oxygen. Moreover, when filling carbonated drinks, it is preferable that the container 30 is formed from the material which has pressure resistance. From such a viewpoint, the container 30 is preferably formed from a metal material such as aluminum or steel or a plastic material such as PET. The container 30 is preferably formed from the same material as the plastic cap 10 from the viewpoint of recyclability. When the container 30 is a PET bottle, the container 30 is preferably a bottle coated with a gas barrier thin film such as a DLC thin film.

  A plastic cap 10 shown in FIG. 1 includes a top plate portion 11 and a cylindrical body portion 12 that hangs down from the periphery of the top plate portion 11, and serves as a lid for the container 30. The plastic cap 10 is a lid in which the outer peripheral surface of the opening portion 32 and the inner peripheral surface of the body portion 12 are in contact, and the top plate portion 11 and the body portion 12 cover the opening portion 32 of the container 30. The plastic cap 10 has a cap diameter corresponding to the outer diameter of the opening 32. The cap diameter of the plastic cap 10 is, for example, 28 mm, 30 mm, 33 mm, and 38 mm based on the outer diameter of the cap.

  The plastic cap 10 shown in FIG. 1 is preferably an opening pattern that is opened by turning the plastic cap 10 in the opening direction A, for example, a screw cap or a twist cap. In FIG. 1, the plastic cap 10 has an example in which a thread is provided on the inner peripheral surface of the body portion 12 and the inner peripheral surface of the body portion 12 and the opening 32 of the container 30 have a screw structure. The opening direction A is, for example, counterclockwise. In this case, the plastic cap 10 is turned clockwise to seal the opening 32 of the container, and the plastic cap 10 is turned counterclockwise to open the opening 32 of the container.

  The plastic cap 10 shown in FIG. 1 is preferably an opening pattern such as an AO cap (Albert Obrist Cap) that is opened by screwing. Moreover, when the container 30 accommodates drinks or foods, the plastic cap 10 is preferably provided with a band portion 15. When the container 30 is opened, the band part 15 is separated from the body part 12, so that the consumer can recognize whether or not the container 30 has been opened. The plastic cap 10 preferably includes an inner seal (not shown) so as to contact the inner surface of the top plate portion 11. The sealing performance of the container 30 when the plastic cap 10 is closed can be further improved.

  The molding method of the plastic cap 10 shown in FIG. 1 is not particularly limited, but is, for example, a compression molding method or an injection molding method. The compression molding method is a method in which a plastic material is placed on the female side of the mold and heated, and when the plastic resin is fluidized, the male side of the mold is aligned and pressure is applied to perform molding. The injection molding method is a method in which a thermoplastic plastic material is heated and fluidized in a heating cylinder, and this is molded by being pushed into a mold space by a plunger with an injection ram.

  Examples of the plastic material forming the plastic cap 10 shown in FIG. 1 include polyethylene resin (PE), polypropylene resin (PP), polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyethylene naphthalate resin, and cycloolefin copolymer resin. (COC, cyclic olefin copolymer), ionomer resin, poly-4-methylpentene-1 resin, polymethyl methacrylate resin, polystyrene resin, ethylene-vinyl alcohol copolymer resin, acrylonitrile resin, polyvinyl chloride resin, polyvinylidene chloride Resin, polyamide resin, polyamideimide resin, polyacetal resin, polycarbonate resin, polysulfone resin, tetrafluoroethylene resin, acrylonitrile-styrene resin, acrylonitrile- Tajien - styrene resin. The plastic material forming the plastic cap 10 is particularly preferably PE, PP or PET.

  The method for sealing the plastic cap 10 shown in FIG. 1 is not particularly limited, but a screw-type sealing method is preferably used. In the screw-type sealing method, the plastic cap 10 is turned around the opening 32 of the container 30 with a sealing device (not shown) such as a rotary head, a roller, or a band and tightened. Furthermore, you may weld the plastic cap 10 and the container 30 by the laser welding method, for example. At this time, defective welding can be reduced by bringing the welded portion between the plastic cap 10 and the container 30 into a close contact state by a close contact means such as a pressing plate.

  The knurl 14 shown in FIG. 1 includes a plurality of ridges 13 installed on the outer peripheral surface of the body portion 12. By providing the knurl 14 on the outer peripheral surface of the body part 12, when the plastic cap 10 is opened, the surface of the finger (not shown) is caught on the ridge 13 of the knurl 14, and the plastic cap 10 can be easily opened. it can. For this reason, it is preferable that the knurls 14 are provided in almost the entire outer peripheral surface of the body portion 12.

  The ridge 13 shown in FIG. 1 extends in a direction from the top plate 11 toward the peripheral end 16 of the body 12. The direction from the top plate portion 11 toward the peripheral end portion 16 of the body portion 12 is, for example, a direction parallel to the central axis 101 of the body portion 12. Although FIG. 1 shows an example in which the ridges 13 extend linearly, the ridges 13 may be curved or bent.

  FIG. 2 is a schematic view showing a second form of the nar. In the second form of the knurl shown in FIG. 2, the ridges 13 installed in the region 21 b are shifted in the opening direction A on the peripheral end portion 16 side of the body portion 12 than on the top plate portion 11 side. As shown in FIG. 2, when the opening direction A is the right direction, the ridge 13 is lowered to the right. Since the peripheral end portion 16 side of the ridge 13 is shifted in the opening direction A, the thread provided on the inner peripheral surface of the body portion 12 when the region 21b is gripped and rotated in the opening direction A. The pressure can be applied along (not shown). Thereby, even if it is a case where the space | interval of the protruding item | line 13 is narrowed, a plastic cap (code | symbol 10 of FIG. 1) can be rotated with little frictional force. The peripheral edge 16 side of the ridge 13 is shifted in the opening direction A, for example, as shown in FIG. Moreover, it may be a part of area | region 21b that the peripheral edge part 16 side of the protruding item | line 13 has shifted | deviated to the opening direction A. FIG. For example, the circumferential end 16 side of the ridge 13 is shifted in the opening direction A within a range of 15 mm in the circumferential direction of the body portion 12. Further, the peripheral edge 16 side of the ridge 13 may be displaced in the opening direction A in a plurality of regions. For example, in addition to the region 21b, a region (not shown) arranged symmetrically with the region 21b with respect to the central axis 101 of the body portion 12 is also shifted in the opening direction A on the peripheral end 16 side of the ridge 13. May be. The inclination angle θ of the ridge 13 is preferably more than 90 ° and less than 180 °. Furthermore, the inclination angle θ of the ridge 13 is preferably more than 120 ° and less than 150 °. Further, the inclination angle θ of the ridge 13 is preferably about 135 °. Moreover, the space | interval Pn of the protruding item | line 13 is 0.7 mm or more and 2 mm or less, for example. Moreover, it is preferable that it is about 1.0 mm or more and about 1.4 mm or less. Further, the ridge 13 installed in the region 21b is in addition to the ridge 13 in which the peripheral end 16 side of the body portion 12 is shifted in the opening direction A from the top plate portion 11 side, and further, the center of the body portion 12 It may be a grid-like ridge (not shown) provided with a ridge (not shown) extending in a direction parallel to the shaft 101. The grid-like ridges (not shown) are formed by, for example, a compression molding method or an injection molding method.

  The inventors investigated the method of opening the plastic cap and the contact portion at the time of opening for 50 people from their 20s to their 70s. We asked each person to open a plastic cap with red ink on the surface of the knurl, and observed each person's opening method and the part of the hand in contact with the nar. As a result, there were mainly three types of plug-opening methods: grip holding, forward and reverse. Furthermore, the knob holding accounted for about 70% of the total. An example of the contact portion when the plug is opened by holding the knob, moving forward, or reverse is shown in FIGS. 3, 4, and 5, respectively.

  FIGS. 3A and 3B are images when the plug is opened by holding the knob, in which FIG. 3A shows a state at the time of opening, and FIG. 3B shows a state of the hand after opening. The thumb palm surface (belly) and the side of the index finger were in contact with the knurl, and friction was generated. At this time, it was found that the soft part of the skin felt pain near the webbed part between the thumb and forefinger.

  FIGS. 4A and 4B are images when the caps are opened by hand, where FIG. 4A shows a state when the cap is opened, and FIG. 4B shows a state of the hand after the cap is opened. From the belly of the index finger, the knurl contacted the webbed part between the thumb and the index finger, and friction was generated. At this time, it was found that pain was felt in the webbed part between the thumb and forefinger and the soft part of the skin around it.

  FIGS. 5A and 5B are images in the case of opening with a reverse hand, where FIG. 5A shows the state when opening, and FIG. 5B shows the state of the hand after opening. The entire index finger belly, part of the middle finger belly, the webbed part between the thumb and index finger, and part of the palm contacted the knurled, and friction was generated. At this time, it was found that pain was felt in the soft part of the skin such as a webbed part between the thumb and the index finger.

  As shown in FIGS. 3, 4, and 5, when the plastic cap is opened, a hard part of the skin such as the thumb or the belly of the fingertip of the index finger is brought into contact with the knurling to generate friction. When the plastic cap is opened, if a soft part of the skin comes in contact with the knurl, you feel pain. Further, the part that feels pain when the plastic cap is opened is between the thumb and the index finger that generate friction. From these, by arranging the area with high anti-slip effect and the area where it is hard to feel pain in the hand in the circumferential direction of the torso part, the pain felt in the hand is reduced and it is difficult to feel pain in the hand The inventors have found that the slipperiness of the hand caused by this is eliminated. In particular, gripping the area with high anti-slip effect with a hard part of the skin and bringing the area that does not feel pain in the hand into contact with the soft part of the skin further maintains the anti-slip effect, and when opening Can alleviate hand pain.

  Therefore, in the plastic cap 10 shown in FIG. 1, a plurality of regions 21 a, a region 21 b, and a region 21 c in which the intervals between the ridges 13 in adjacent regions are different are provided in the circumferential direction of the body portion 12. For example, as shown in FIG. 1, the interval between the ridges 13 in the region 21a is larger than the interval between the ridges 13 in the region 21b. The interval between the ridges 13 in the region 21b may be larger than the interval between the ridges 13 in the region 21a (not shown). Moreover, the space | interval of the protruding item | line 13 of the adjacent area | region 21b and the area | region 21c differs similarly to the interval of the protruding item | line 13 of the area | region 21a and the area | region 21b. By installing a region with a large interval between the ridges 13 so that the ridges 13 bite into the surface of the hand and a region with a small interval between the ridges 13 so that the convex part of the knurl does not bite into the surface of the hand, A region having a high anti-slip effect and a region where it is difficult to feel pain in the hand can be provided in the knurl 14.

  Here, in the plurality of regions 21a, 21b, and 21c, the ridges 13 are arranged at equal intervals. When the ridges 13 extend linearly, the interval between the ridges 13 is the distance between the zenith portions of the ridges 13 that cross the direction in which the ridges 13 extend. The distance between the zenith portions of the ridges 13 may be the distance between the centers of the ridges 13 in the circumferential direction of the body portion 12 when the zenith portions are flat, or the boundary portion between the body portion 12 and the ridges 13. It may be a distance between each other.

  In the plastic cap 10 shown in FIG. 1, it is preferable that the space | interval of the protruding item | line 13 is 1.5 mm or more and 1.6 mm or less, or 0.7 mm or more and 0.8 mm or less. For example, the region 21a and the region 21c where the ridges 13 are installed at 1.5 mm or more and 1.6 mm or less, and the region 21b where the ridges 13 are installed at 0.7 mm or more and 0.8 mm or less are the body parts. It is preferable to arrange alternately in 12 circumferential directions. By setting the interval between the ridges 13 to 1.5 mm or more and 1.6 mm or less, the region 21a and the region 21c can be regions having a high anti-slip effect. On the other hand, by setting the interval between the ridges 13 to 0.7 mm or more and 0.8 mm or less, the region 21b can be made a region in which pain is hardly felt in the hand. As described above, the regions 21a and 21c having a high anti-slip effect and the regions 21b in which the hand is less likely to feel pain are alternately arranged in the circumferential direction of the torso portion 12 to balance hand pain and slipperiness. It will be 14 Naruto. Furthermore, it is preferable that the height from the trunk | drum 12 of the protruding item | line 13 is 0.2 mm or more and 0.3 mm or less. Moreover, it is preferable that the curvature radius of the top | zenith part of the protruding item | line 13 is 0.2 mm or more and 0.3 mm or less.

  The total number of the regions 21a, 21b, and 21c provided in the plastic cap 10 shown in FIG. For example, the total number of the regions 21a, 21b, and 21c is an even number, and a region having a high anti-slip effect and a region that hardly causes pain in the hand are provided equally. In addition, the total number of the regions 21a, 21b, and 21c can be set to an odd number to increase the number of regions having a high anti-slip effect and increase the number of regions that do not feel pain in the hand. In particular, in the plastic cap 10, the plurality of regions are preferably 4, 6 or 8 regions. The length of the abdomen of the index finger or thumb tip is typically about 10 mm to 30 mm, and the width of the webbed portion between the thumb and forefinger is typically about 10 mm to 30 mm. Therefore, the plastic cap 10 having a cap diameter of 28 mm, 30 mm, 33 mm, and 38 mm can be slipped by setting the total number of the regions 21a, 21b, and 21c provided in the plastic cap 10 to 4, 6, or 8. An area having a high stopping effect and an area where it is difficult to feel pain in the hand can be arranged with a width suitable for the size of a standard hand.

  It is preferable that the width | variety in the circumferential direction of the trunk | drum 12 is equal respectively in the area | region 21a, the area | region 21b, and the area | region 21c. The body portion 12 has a cylindrical shape, and each region 21a, region 21b, and region 21c has the same width, so that the region 21a or the region 21c having a high anti-slip effect can be obtained no matter where the outer periphery of the body portion 12 is gripped. And the region 21b where it is difficult to feel pain in the hand can be brought into contact with the hand. In particular, if the cap diameter is 28 mm, 30 mm, or 33 mm, it is preferable to provide a total of four or six regions 21a and 21b. If the cap diameter is 38 mm, it is preferable to provide a total of six, eight, or ten regions 21a, 21b, and 21c. Each region can be contacted with a width that matches the standard size of a human hand.

  A third form of Nar will be described with reference to FIGS. FIG. 6 is a top view of a plastic cap showing a third form of the knurl. FIG. 7 is a perspective view showing an example of a plastic cap 93 to which the third form of Nar is applied. The region 21 a, the region 21 b, the region 21 c, and the region 21 d are provided in order in the circumferential direction of the body portion 12. The widths of the body portion 12 in the circumferential direction of the region 21a, the region 21b, the region 21c, and the region 21d are equal, and the central angle of the body portion 12 is 90 °. Regions 21b and 21d where the ridges 13 are installed at 0.7 mm and regions 21a and 21c where the ridges 13 are installed at 1.5 mm are alternately arranged in the circumferential direction of the body portion 12. ing. When the cap diameter is 28 mm, the interval between the ridges 13 in the region 21b and the region 21d is approximately 3 ° at the central angle of the body part 12, and the interval between the ridges 13 in the region 21a and the region 21c is The central angle is approximately 6 °.

  A fourth form of Nar will be described with reference to FIG. 8 is a perspective view showing an example of a plastic cap in which the second form of the knurl shown in FIG. 2 is applied to the third form of the knurl shown in FIG. In the fourth form of the knurl shown in FIG. 8, the ridges 13 of the region 21 b and the region 21 d shown in FIG. 7 are inclined, and the peripheral end portion 16 side of the body portion 12 is more open than the top plate portion 11 side. It is shifted to A. In the fourth form of Nar, the plastic cap 94 can be rotated with a small frictional force even when the interval between the ridges 13 is narrowed.

  FIG. 9 is a top view of a plastic cap showing a fifth form of the knurl. The fifth form of the knurl shown in FIG. 9 is different from the third form of the knurl shown in FIG. 6 in that the four regions shown in FIG. 6 are six regions. Six regions 21 a, a region 21 b, a region 21 c, a region 21 d, a region 21 e, and a region 21 f are sequentially provided in the circumferential direction of the body portion 12. The width of the body portion 12 in the circumferential direction of the region 21a, the region 21b, the region 21c, the region 21d, the region 21e, and the region 21f is equal, and the central angle of the body portion 12 is 60 °. The region 21b, the region 21d, and the region 21f in which the ridges 13 are installed at 0.7 mm, and the region 21a, the region 21c, and the region 21e in which the ridges 13 are installed at 1.5 mm are the circumference of the body portion 12. Alternatingly arranged in the direction. When the cap diameter is 28 mm, the interval between the ridges 13 in the region 21b, the region 21d, and the region 21f is approximately 3 ° at the central angle of the body portion 12, and the ridges 13 in the region 21a, the region 21c, and the region 21e The interval is approximately 6 ° at the central angle of the body portion 12.

  A sensory test for evaluating the plastic cap 10 shown in FIG. 1 was performed. There were 30 evaluators, 16 men and 14 women. As Example 1, a plastic cap 93 (hereinafter referred to as “four divisions”) having the third form of the knurl shown in FIGS. 6 and 7 was used. As Example 2, a plastic cap 95 (indicated as 6 divisions) having the fifth form of Narl shown in FIG. 9 was used. Further, as Comparative Example 1, a plastic cap (hereinafter referred to as 60 lines) in which 60 lines of equally spaced ridges 13 were provided on the body part 12 was used. As Comparative Example 2, a plastic cap (hereinafter referred to as 120 lines) in which 120 lines of ridges 13 with equal intervals were provided on the body part 12 was used.

  Using the example 1 “4 divisions”, the example 2 “6 divisions”, the comparative example 1 “60 lines”, and the comparative example 2 “120 lines”, “no pain in hand” when opening the plastic cap. And a sensory test comparing “hardness of hand slipping”. In the sensory test, one person was divided into 6 steps from 0 to 5 points for each of Example 1 “4 divisions”, Example 2 “6 divisions”, Comparative Example 1 “60 lines”, and Comparative Example 2 “120 lines”. Evaluation was performed. That is, in the case of “the hand does not hurt”, the 0 point is “the hand hurts” and the 5 point “the hand does not hurt”. In addition, in “hardness of hand slipping”, 0 points is “easy to slip” and 5 points is “hard to slip”. Then, for each of Example 1 “4 divisions”, Example 2 “6 divisions”, Comparative Example 1 “60 lines”, and Comparative Example 2 “120 lines”, the total number of points given by 30 people is obtained, and 30 people are obtained. The average score was obtained by dividing by. FIG. 10 and FIG. 11 show the sensory test results of “not painful hand” and “difficulty of hand slipping”.

  FIG. 10 is a graph showing the sensory test result of “no pain in hand”. Since Comparative Example 1 “60 Line” is 1.51 and Comparative Example 2 “120 Line” is 3.86, Comparative Example 2 “120 Line” with a narrow spacing between the ridges feels no pain. I understood that. And since Example 1 "4 divisions" was 2.79 and Example 2 "6 divisions" was 2.93, by dividing the Nar area into a plurality, Comparative Example 1 "60 lines" It was found that hand pain can be relieved rather than.

  FIG. 11 is a graph showing a sensory test result of “hardness of hand slipping”. Since Comparative Example 1 “60 Line” is 4.00 and Comparative Example 2 “120 Line” is 2.37, Comparative Example 1 “60 Line” with a wider interval between the ridges is more difficult to slip. I understood. Since Example 1 “4 divisions” was 3.48 and Example 2 “6 divisions” was 3.68, both had the same degree of slippage as Comparative Example 1 “60 lines”. It turns out that it is obtained.

  As described above, from the results of the sensory test shown in FIGS. 10 and 11, Example 1 “4 divisions” and Example 2 “6 divisions” are less painful than Comparative Example 1 “60 lines”, and Comparative Example 1 “ It was found that the same degree of slippage as “60 lines” can be obtained.

  Further, a sensory test was also conducted on the “easy to open” of the plastic cap. As a result, Example 1 “4-segment” and Example 2 “6-segment” were compared with Comparative Example 1 “60 lines” and Comparative Example 2 “ It was found that the score was higher than “120 lines” and it was felt “easy to open”.

It is a schematic front view of the plastic cap which concerns on this embodiment. It is the schematic of the plastic cap which shows the 2nd form of Nar. It is an image at the time of opening with a knob holding, (a) shows the mode at the time of opening, (b) shows the state of the hand after opening. It is the image at the time of opening in order, (a) shows the mode at the time of opening, (b) shows the state of the hand after opening. It is an image at the time of opening with a reverse hand, (a) shows the mode at the time of opening, (b) shows the state of the hand after opening. It is a top view of the plastic cap which shows the 3rd form of Nar. It is a perspective view which shows an example of the plastic cap to which the 3rd form of Nar is applied. It is a perspective view which shows an example of the plastic cap to which the 4th form of Nar is applied. It is a top view of the plastic cap which shows the 5th form of Nar. It is a graph which shows the sensory test result of "does not hurt a hand". It is a graph which shows the sensory test result of "the difficulty of hand slipping."

Explanation of symbols

10, 93, 94, 95 Plastic cap 11 Top plate part 12 Body part 13 Convex strip 14 Knurl 15 Band part 16 Circumferential end part 21a, 21b, 21c, 21d, 21e, 21f Region 30 Container 31 Housing part 32 Opening part 101 Body Central axis of the part

Claims (6)

A knurled comprising a top plate portion and a cylindrical body portion hanging from the periphery of the top plate portion, and comprising a plurality of ridges extending in a direction from the top plate portion toward the peripheral end portion of the body portion. In the plastic cap that has on the outer peripheral surface of the body part and serves as the lid of the container,
A plurality of regions in which the ridges are installed at equal intervals along the circumferential direction of the body portion are provided in the circumferential direction of the body portion, and the intervals between the ridges in the adjacent regions are different , and The plastic cap, wherein the top of the ridge is outside the outer peripheral surface of the body, and the radius of curvature of the top of the ridge is smaller than the radius of curvature of the top plate . Four, six, or eight regions are provided,
2. The plastic cap according to claim 1, wherein the widths of the regions in the circumferential direction of the body portion are equal to each other. The interval between the ridges is 1.5 mm or more and 1.6 mm or less or 0.7 mm or more and 0.8 mm or less,
The region where the ridges are installed at 1.5 mm or more and 1.6 mm or less and the region where the ridges are installed at 0.7 mm or more and 0.8 mm or less are alternately arranged in the circumferential direction of the body portion. The plastic cap according to claim 1, wherein the plastic cap is disposed.   4. The plastic cap according to claim 1, wherein a peripheral end portion side of the body portion of the ridge is displaced in an opening direction with respect to the top plate portion side of the ridge. The region 1 in which the direction of the ridges is parallel to the central axis of the trunk portion, and the direction of the ridges are such that the peripheral end side of the trunk portion is more open than the top plate portion side of the ridges. 5. The plastic cap according to claim 1, wherein the plastic cap has a region 2 which is a direction shifted in a plug direction, and the region 1 and the region 2 are arranged at adjacent positions. A product or container sealed with the plastic cap according to claim 1, 2, 3, 4 or 5 .

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