JP4702716B2 - Pinch grip type bottle container - Google Patents

Description

  The present invention relates to a pinch grip type bottle type container in which a grip function part is integrally formed by forming recesses oppositely on both side wall portions of a body part of a large synthetic resin bottle type container with a grip (handle) function part. Is.

As a prior art of a large plastic bottle container with a grip function part, in addition to a bottle container in which a separately formed handle is attached to the container body, Patent Document 1 discloses a finger on both side walls of the body. A pinch-grip type bottle-shaped container (capacity 2. in the embodiment) is provided with a recess for contact, and a small recess in which each finger is engaged with the recess, and a grip portion including the back surface region of the trunk. 7L bottle-shaped containers).
Japanese Patent Laid-Open No. 2003-165518

The pinch grip type bottle container described above has reduced manufacturing costs, simplified the manufacturing process, and saved resources of resin materials compared to a bottle container that has a separately molded handle attached to the container body. There are many advantages in terms of conversion.
In such a pinch grip type bottle-type container, a bottle-type container obtained by biaxially stretching blow-molding a test tubular preform made of polyethylene terephthalate (hereinafter abbreviated as PET) resin is often used.

In addition, in the above-mentioned pinch grip type bottle-type container, practical use of a large container of about 4 liters has begun, for example, for the purpose of storing alcoholic beverages, and further thinning from the viewpoint of resource saving and cost reduction. There is a need.
However, when it becomes large in this way, when a preform made of PET resin is biaxially stretch blow molded, the influence of unevenness such as a recess for finger contact, and the stretch hardening of the resin by high magnification stretching, There is a problem of formability that the uneven shape of the mold cannot be shaped with good reproducibility (so-called sinking).

  In addition, in such a large container, it will be quite heavy when filled with the content liquid, and with a pinch grip type grip, even with a method in which a separately formed handle body is attached to the container body, There is also a gripping problem that it becomes difficult to support the weight, and in any case, an effective countermeasure is required.

  Therefore, the present invention is particularly aimed at improving the formability of biaxial stretch blow molding and / or improving the gripping property in a pinch grip type bottle-shaped container having large and small irregularities, Accordingly, it is an object of the present invention to provide a pinch grip type bottle-type container which is large and thin but has improved formability and / or gripping property.

  The basic idea of the present invention is that, even if the capacity of the bottle-type container is increased from 2.7 L to 4 L, 5 L, etc. It is assumed that the grip portion cannot be formed, and the grip portion is left as it is, and the grip portion is arranged closer to the central axis of the trunk portion, so that shapeability in biaxial stretch blow molding and / or gripping of a heavy container It is in the point of trying to improve the holding property.

Of the present invention, the means of the invention according to claim 1 is:
Each of the both side wall portions of the cylindrical body portion serving as the base is formed with a finger rest recess facing each other, both the recesses, the back wall portion between the both recesses, the back wall portion and the both recesses. In the left and right end side walls connecting the synthetic resin pinch grip type bottle type container forming the grip part,
With a flat cross-section, the peripheral wall of the grip part is formed close to the central axis of the body part inside the imaginary circle related to the peripheral wall of the cylindrical body part as the base, and the grip part is disposed close to the direction of the central axis To do.

In the first aspect of the present invention, the peripheral wall of the grip portion is formed in a flat cross section so as to be close to the central axis of the body portion on the inner side of the virtual circle related to the peripheral wall of the cylindrical body portion serving as the base, and the grip portion is formed. By placing close to the direction of the central axis,
In biaxial stretch blow molding, the stretch ratio of the synthetic resin in the grip portion can be lowered, and the shapeability in the grip portion can be improved.

  In addition, by placing the grip part closer to the center axis, when holding the container in an upright position, the container can be held at a position closer to the center of gravity, even with a heavy container Can be grabbed.

According to a second aspect of the present invention, in the first aspect of the invention, the bottle-type container is a molded product obtained by biaxially stretching blow molding a synthetic resin test tubular preform, and has a flat cross section and a peripheral wall of the grip portion. In this case, the distance from the central axis of the portion located farthest from the central axis is Lmax, and the grip portion is arranged close to the central axis so that Lmax satisfies the following expression (1).
Lmax / (din / 2) ≦ 4.5 (1)
Here, din is the inner diameter of the mouth tube portion of the bottle-type container.

The invention according to claim 2 is for improving the formability in biaxial stretch blow molding of a container by a synthetic resin preform.
In the biaxial stretch blow molding of the container of the present invention, a test tubular preform is longitudinally stretched with a stretching rod and blown air is blown to expand and deform coaxially in the lateral direction. However, especially on the back of the container in which the grip portion is formed, the expanded resin first hits the bottom surface of the recess, and then the shape of the grip portion is shaped, so that the original stretchability of the synthetic resin is not exhibited. For example, the shape of the non-slip protrusion formed on the surface of the concave portion of the grip portion is not sufficiently formed, and so-called sink occurs.

  Here, according to the above-described configuration of the second aspect, the ratio of Lmax, which is a distance from the central axis of the portion located farthest from the central axis in the peripheral wall of the grip portion in a flat cross section, and the inner radius of the mouthpiece portion By setting the value of Lmax / (din / 2) to a range of 4.5 or less, that is, by suppressing the stretch ratio of the portion that requires the largest stretch in the grip portion within a certain range, a sufficient increase in the grip portion is achieved. The shape can be exhibited.

Here, the mouthpiece portion of the container is the preformed mouthpiece portion itself, and the inner diameter of the preform mouthpiece portion is substantially the same as the inner diameter of the preform body portion. The ratio of din / 2) is a value corresponding to the transverse draw ratio in biaxial stretch blow molding.
When this ratio exceeds 4.5, it becomes difficult to form small irregularities such as non-slip protrusions formed in the recesses.
Further, as an element for adjusting the Lmax / (din / 2) value, in addition to the method of adjusting the position of the grip portion with respect to the central axis as in the present invention, the shape of the grip portion can be changed, or the inner diameter of the mouth tube portion can be changed. Of these, there are factors such as changing, but among these, the shape of the grip part needs to be a substantially fixed shape from the point of gripping, and the inner diameter of the mouth tube part can not be freely adopted, it is the de facto standard (de facto standard).

According to a third aspect of the present invention, in the first or second aspect of the present invention, the weight when the content liquid is filled is M (Kgf), and the distance between the central axis and the back wall portion right and left central position in a plane cross section. Is Lb (m), and the grip portion is arranged close to the central axis so that the product of both satisfies the following formula (1).
M × Lb ≦ 0.3 (Kgf · m) (1)

The invention described in claim 3 is to enable a container to be stably held in an upright posture even in a large capacity container of about 5 L in particular.
Here, the value of M × Lb is used to indicate the magnitude of the rotational moment-like force acting on the fingertip that grips the grip portion when the container is in the standing posture, and this value is set to 0. By setting the range to 3 Kgf · m or less, the container can be stably held in an upright posture even with a large weight.
If this value exceeds 0.3 Kgf · m, the action of a rotational moment-like force applied to the gripped fingertip increases, and it becomes difficult to stably hold the container in an upright posture.
Also, as can be seen from this formula, if the load increases, the position of the back wall part needs to be closer to the central axis, and if the weight is determined by the container product, how close the grip part should be to the central axis Can be calculated.

  According to a fourth aspect of the present invention, in the invention of the first, second, or third aspect, the lateral width of the grip portion is in the range of 70 to 90 mm, and the other side from the bottom surface of one recess through the back wall portion. The grip circumferential length reaching the bottom surface of the recess is in the range of 145 to 165 mm.

  In the invention according to claim 4, the shape of the grip portion is determined in consideration of the average size of a general human hand. When grasping the container by grasping the grip portion of the present invention by hand, the load is supported mainly by the first finger and the second finger, but the lateral width is the first of the second finger from the first joint of the first finger. The range is determined in consideration of the length between the joint and the second joint, and the grip circumference is determined in consideration of the length from the tip of the first finger to the tip of the second finger. Therefore, when each dimension is in the above range, a good grip property is exhibited for many people.

  According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect of the invention, the capacity is increased to a large size of 2.7 L or more.

  In the invention according to claim 5, by forming a large container of 2.7 L or more and making the grip portion close to the central axis, the formability in biaxial stretch blow molding and / or the grasping of the container is achieved. The effects related to the holding property are more effectively exhibited.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the first aspect of the invention, the grip portion is arranged close to the direction of the central axis of the body portion, so that the stretch ratio of the synthetic resin in the grip portion is lowered in the biaxial stretch blow molding, and the grip portion And / or when holding the container in an upright position, the container can be held at a position closer to the center of gravity, and even a heavy container can be held more stably. can do.

  In the invention of claim 2, Lmax is the ratio of Lmax, which is the distance from the central axis of the portion located farthest from the central axis on the peripheral wall of the grip portion, and Lmax, which is the inner radius of the mouth tube portion, in a flat section. When the value of / (din / 2) is set to 4.5 or less, that is, the stretch ratio of the portion requiring the greatest stretch in the grip portion is kept within a certain range, sufficient shaping is performed in the grip portion. The ability to show off.

  In the invention described in claim 3, the value of M × Lb indicates the magnitude of the rotational moment-like force acting on the fingertip gripping the grip portion when the container is in the standing posture. By setting this value within the range of 0.3 kgf · m or less, even a large container of about 5 L can be stably held in a standing posture.

  In the invention according to claim 4, the shape of the grip portion is determined in consideration of the average size of a general human hand, the grip portion has a lateral width in the range of 70 to 90 mm, and a grip circumference. By making the range of 145 to 165 mm, good grip performance is exhibited for many people.

  In the invention according to claim 5, by forming a large container of 2.7 L or more, the formability in biaxial stretch blow molding and / or grasping of the container by bringing the grip portion closer to the central axis The effect which concerns on sex is exhibited more effectively.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 5). The pinch grip type bottle-type container shown in the figure is a biaxial stretch blow molded product made of PET resin and having a capacity of 4L.
It has a cylindrical body 1 serving as a base body, and a bottom part 14 demonstrating a seat function is connected to the lower end of the body 1, and an outer periphery is provided through a tapered tubular shoulder part 15 whose diameter is reduced upward. It has a structure in which a cylindrical mouth tube portion 17 in which a thread is engraved on the surface is continuously provided.

  The trunk portion 1 having reinforcing circumferential ribs 13 provided at both upper and lower ends, which are the boundary between the bottom portion 14 and the shoulder portion 15, is cylindrical as a base body. The cylindrical peripheral wall is slightly above and behind the side wall portions 2. A pair of vertically long recesses 3 are formed in a side portion so as to be opposed to each other from the side, both the recesses 3, a back wall portion 10 positioned between the both recesses 3, the back wall portion 10 and both recesses A grip portion 12 having a concave portion 3 as a finger contact concave portion is formed by an end side wall portion 10s formed in an arc shape that connects the three. In addition, the regular polygonal cylindrical panel wall part 16 formed in the shoulder part 15 exhibits the decompression absorption function similarly to the flat back wall part 10.

  In addition, each recess 3 is provided with three reinforcing ribs 8 (see FIG. 2) extending in an arch shape. The three reinforcing ribs 8 divide the inside of the recess 3 into four small recesses 3a. Thus, the fingertip of each finger is stably positioned in any one of the small recesses 3a, and the mechanical strength of the recesses 3 is increased. Further, anti-slip protrusions 7 are formed on the side surfaces 4 of the recesses, and small protrusions 9 are formed on the bottom surfaces 5 of the respective small recesses 3a to improve the releasability of the blow-molded bottle container from the blow mold. Have

  Moreover, the back wall part 10 located between both the recessed parts 3 is surrounded by the ridgeline, and is formed so as to be depressed over substantially the entire height range of the trunk part 1 (see FIG. 2). Then, at the height position of the back wall portion 10 corresponding to the concave portion 3 constituting the grip portion 12, the back wall portion 10 is flexibly deformed and deformed by the gripping force acting on the grip portion 12, and the grip property is increased. Two horizontal ribs 11 for reinforcement for increasing the rigidity of the back wall portion 10 are provided in parallel so as not to decrease.

Next, FIG. 5 is a cross-sectional plan view taken along line BB in FIG. 2, and includes the dimensions of each part in the flat cross section at the height position where the grip portion 12 is formed according to FIG. The shape and arrangement position of the grip portion 12 will be mainly described. (Note that FIG. 5 is enlarged compared to FIG. 4.)
In the figure, a circle indicated by a two-dot chain line located on the outermost periphery is a virtual circle C having a diameter of 134 mm indicating the cylindrical body 1 serving as a base. The grip portion 12 has a lateral width Wg of 82 mm, a grip circumferential length Lg from the bottom surface 5 of one recess 3 to the bottom surface 5 of the other recess 3 is 155 mm, and a distance Lb between the center axis Ax and the left and right center position 10c of the back wall portion 10 is The portion of the peripheral wall of the grip portion 12 that is located farthest from the center axis Ax is located near the boundary between the back wall portion 10 and the left and right end side wall portions 10s, and the distance Lmax is 60 mm. The inner diameter of the mouth tube portion 17 is 29 mm.

  From the above dimensions, the value of Lmax / (din / 2) is 4.1, which is in the range of 4.5 or less, and there is no sink in biaxial stretch blow molding. 7. The shape of the small protrusions 9 and the like could be shaped with high accuracy along the shape of the mold cavity.

Here, assuming the arrangement state in the mold of biaxial stretch blow molding in FIG. 5, the trunk cross section of the preform P is shown by a two-dot chain line coaxially with the container. In the initial stage of the transverse stretching process of the axial stretch blow molding, the preform P expanded coaxially as shown by the virtual circle P1 hits the portion corresponding to the bottom surface 5 of the recess 3 of the mold, and further corresponds to the recess 3 It stretches and deforms along the curved part. For this reason, the larger the container is, the more difficult it is to shape a small uneven shape such as the reinforcing rib 8, the non-slip protrusion 7, and the small protrusion 9 with high accuracy in shaping the grip portion 12.
Therefore, by bringing the grip portion 12 closer to the central axis Ax direction as described above, the stretch ratio in the grip portion 12 can be suppressed, and small irregularities can be shaped with high accuracy.
The inner diameter dpin of the preform body is substantially the same as the inner diameter din of the mouth tube portion 17.

  Further, as described above, since the distance Lb between the central axis Ax and the left and right central position 10c of the back wall portion 10 is 54 mm and the weight when water is filled is 4.1 kgf, the value of M × Lb is 0.22 Kgf · m was sufficiently smaller than 0.3 kgf · m. That is, as described above, from the viewpoint of formability of the biaxial stretch blow molding, the grip portion 12 is arranged close to the direction of the central axis Ax, so that the rotational moment applied to the fingertip when the grip portion is gripped with one hand. The force of the shape can be made sufficiently small, and coupled with the fact that the shape of the grip portion 12 matches well with the shape of the palm, the standing posture of the container can be stably maintained.

  In the case of the 4L container of the present embodiment, as described above, the grip portion 12 is arranged close to the direction of the central axis Ax from the viewpoint of the formability of the biaxial stretch blow molding, so that M × Lb ≦ 0.3 (Kgf · m) can satisfy the requirements for gripping heavy objects, but with larger capacities of 5L or 6L, the moldability of biaxial stretch blow molding and this It is necessary to design the arrangement position of the grip portion 12 in consideration of both gripping properties of heavy objects.

As mentioned above, although embodiment of this invention was described using the embodiment, this invention is not limited to this Example. The detailed shape or material of the pinch grip type bottle-type container in this embodiment is merely an example, and the detailed configuration has various variations as long as it does not exceed the concept and scope of the present invention.
For example, the capacity is not limited to 4L, and it is also effective for large containers exceeding 2.7L, and even for very large containers exceeding 5L. In addition to the PET resin, other synthetic resins such as a polypropylene resin can be used.

  As described above, the pinch grip type bottle-type container of the present invention is excellent in formability and / or gripping property in biaxial stretch blow molding even if it is large, especially in several liters. A wide range of applications can be expected with large containers.

1 is an overall front view showing an embodiment of the present invention. It is a whole side view of the embodiment shown in FIG. FIG. 2 is an overall rear view of the exemplary embodiment shown in FIG. It is the whole plane sectional view which looked at the cutting arrow along the AA line in FIG. It is the whole plane sectional view shown along the BB line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; trunk | drum 2; side wall part 3; recessed part 3a; small recessed part 4; recessed part side surface 5; (recessed part) bottom face 7; anti-slip protrusion 8; reinforcing rib 9; 11; transverse rib 12; grip part 13; reinforcing peripheral rib 14; bottom 15; shoulder 16; panel wall part 17; mouth tube part Ax; center axis C; (base body part) virtual circle P; (Expanded preform) virtual circle dpin; (preform body) inner diameter din; (mouth tube) inner diameter Lmax; (longest) distance Lb; (back wall portion) distance Lg; grip circumference Wg; (grip) width

Claims (5)

Each of the side wall portions (2) of the cylindrical body (1) serving as a base is formed with a finger resting recess (3) facing each other, the both recesses (3), and the both recesses (3). The grip part (12) is formed by the back wall part (10) between the left and right end side wall parts (10s) connecting the back wall part (10) and both concave parts (3). In the pinch grip type bottle-shaped container, the peripheral wall of the grip portion (12) has a flat cross section and the central axis (1) of the trunk portion (1) inside the virtual circle related to the peripheral wall of the cylindrical trunk portion (1) serving as the base. A pinch grip type bottle-type container, which is formed close to Ax) and has a grip portion (12) placed close to the direction of the central axis (Ax). The bottle-type container is a molded product obtained by biaxially stretching blow-molding a test tubular preform (P) made of synthetic resin, and is a flat cross section and is located farthest from the central axis (Ax) on the peripheral wall of the grip portion (12). The distance from the said central axis (Ax) of a part is set to Lmax, The grip part (12) was arrange | positioned close to the central axis (Ax) so that this Lmax might satisfy | fill following formula (1). Pinch grip type bottle type container.
Lmax / (din / 2) ≦ 4.5 (1)
Here, din is the inner diameter of the mouth tube portion (17) of the bottle-type container. The weight when the content liquid is filled is M (Kgf), and the distance between the central axis (Ax) and the back wall portion (10) left and right central position (10C) is Lb (m) in a flat section, and the product of both is The pinch grip type bottle container according to claim 1 or 2, wherein the grip portion (12) is arranged close to the central axis (Ax) so as to satisfy the following formula (1).
M × Lb ≦ 0.3 (Kgf · m) (1) The left and right lateral width (Wg) of the grip portion (12) is in the range of 70 to 90 mm, and the bottom surface of the other concave portion (3) from the bottom surface (5) of one concave portion (3) through the back wall portion (10) ( The pinch grip type bottle container according to claim 1, 2 or 3, wherein the grip circumference (Lg) leading to 5) is in the range of 145 to 165 mm. The pinch grip type bottle container according to claim 1, 2, 3, or 4 having a large capacity of 2.7L or more.

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