JP2000218683A - Handle member for hollow container made of synthetic resin and handled hollow container made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrally mold a handled large-sized hollow container by providing a handle member made of a PET resin separately molded by injection molding on the body part of a hollow container made of a PET resin, which is obtained by biaxial stretch blow molding, by insert molding. SOLUTION: A handle member 11 comprising a thermoplastic resin is produced by providing a pair of assembling arm plates 13 to the upper and lower end portions of a handle plate 12 to form the handle plate into an almost horizontal U-shape and providing assembling projections 14 to the assembling arm plates so as to protrude them outwardly so as to be able to assemble the handle plate to the upper side wall surface of a hollow container main body made of a synthetic resin. In this case, the end surfaces of the projections 14 raised from the assembling arm plates are formed into a smooth circular arc shape and a rinforcing beam 15 is provided across the assembling arm plates so as to be positioned on the rear sides of the projections to constitute a ring-shaped handle member 11 wherein the surfaces being in contact with a preform P of the projections 14 are inclined outwardly with respect to the preform to be curved toward the preform and can be bonded to a hollow container comprising a polyethylene terephthalate resin by insert molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow container with a handle made of polyethylene terephthalate (PET) resin and biaxially stretched and blow-molded, and more particularly to injection molding when blow molding a PET resin preform into a hollow container. The present invention relates to a large hollow container with a handle, which is integrally formed by insert-molding a handle made of a PET resin formed separately into a body of a container body by insert molding.

[0002]

2. Description of the Related Art In recent years, as living standards have improved,
Lifestyle has also changed, and alcohol, juice and other soft drinks are consumed in large quantities on a daily basis, and containers for storing these are also disposable, inexpensive, synthetic resin containers that are easy to mass produce. As the shape becomes progressively larger, its weight gradually increases, making it difficult to carry containers.
The inconvenience has also been felt when pouring and transferring the contents from a container to a small container.

[0003] To make it easy to hold such a large and heavy container, a handle may be attached to the container. 2. Description of the Related Art When blow molding a parison made of a thermoplastic resin such as vinyl chloride into a container, a large container with a handle is also formed in which a handle is integrally formed with the container body at the same time.

[0004] However, containers made of polyethylene, vinyl chloride or the like as described above are suitable for containing detergents and petroleum, but require sterilization and heating like juices and other drinks. To accommodate food and drink
Additives harmful to the human body such as plasticizers are eluted, and the container is deformed by heating, which is inappropriate. Therefore,
In recent years, as containers that need to be heat-sterilized for containers filled with food and drink, blow-molded containers made of polyethylene terephthalate (PET) resin that can withstand heat-sterilization temperatures have become widely used. It has become.

[0005] Furthermore, since a container made of PET resin can be blow-molded without adding a plasticizer, it is superior in safety and gas barrier properties as a container for storing foods than conventional products, and It is widely used because it has transparency, mechanical strength, and the like. In particular, beverages such as juices need to be filled at a high temperature and then sterilized, so that the containers used for these are required to have heat resistance, but PET resin containers are blow molded. Since heat resistance can be imparted by performing heat setting later, it has become indispensable.

However, to blow-mold a PET resin container having heat resistance and safety as described above, a handle and a container body are integrally molded simultaneously, as in the case of a polyethylene or vinyl chloride resin container. It is very difficult to make a PET resin container with a handle due to the characteristics of the PET resin. Therefore, in the case of a large hollow container made of PET resin that is currently used, a handle formed separately by injection molding or the like using a resin of a different material is used to insert a preform made of PET resin into a blow mold. When performing blow molding into a hollow container by setting it at the same time, insert molding is performed at the same time, and a method of assembling the container to the wall surface of the container has been adopted.

By the way, the conventionally used PET
As a typical large hollow container with a handle made of resin, the one described in JP-A-2-191156 is widely known. As shown in FIG. 13, as shown in FIG. 13, the grip plate portion 52 and the fitting portions 53 protruding laterally from both ends thereof are outwardly attached to the tip of the fitting portion of the handle body 51 formed in a substantially U-shape. The shape having the projections 54 is separately molded by injection molding of a polypropylene resin or the like, and when the preform obtained by injection molding the PET resin is blow-molded into a hollow container by a blow molding die, the handle 51 is used. Are simultaneously inserted into the recesses 55 for attaching a handle formed on the upper side wall of the body of the container body 50 by insert molding, and the projections 54 of the handle body 51 are the innermost portions of the upper and lower surfaces of the recesses 55 for attaching the handle. As shown in FIG. 12, the handle 51 was mounted on a hollow container with a handle so that the outer surface of the grip plate 52 was flush with the outer surface of the container body, as shown in FIG. Things.

By the way, the handle 51 having a U-shape as described above can be formed easily and inexpensively because of its simple structure, and can be attached to the body wall of the container. However, on the other hand, when the container falls down from the handle direction side so as to collide with the floor surface due to a collapse of the load during transportation or an accident due to carelessness at the time of use, etc. Since the surface of the container bends by receiving an impact force, the impact force is concentrated on the surface of the projection 54 of the fitting portion 53, so that there is a problem that the portion of the container is easily cracked.

There have been proposed various types in which such disadvantages are improved. One example of such a container is described in Japanese Patent Application Laid-Open No. Hei 7-223254. As shown schematically in FIG. 14, the containers have a pair of assembling plates 63 for assembling the handle 61 on the upper and lower surfaces of a handle mounting recess 67 formed in the body of the container main body 60.
a, 63b are connected to the upper and lower ends of the plate-like handle portion 62, and the front end of the two sets of plates 63a, 63b is connected to the wall surface of the plate-shaped mounting recess by a beam plate 65 attached to the wall surface. An upwardly projecting piece 64a is projected from a front end portion of the upper assembly plate 63a on the annular handle body 61 having a substantially O-shape connected thereto, and a downwardly projecting piece 64b is formed on the front end portion of the lower assembly plate 63b.
Is provided with a handle body formed by injection molding of a polypropylene resin or the like into a structure having a protruding portion.

[0010] The handle 61 formed in the above-described structure.
Is the PET held in the mold of the blow molding device.
When a preform molded from a resin is loaded into a blow mold and blow-molded into a hollow container, the preform is inserted into a concave portion 67 for attaching a handle formed on the upper side wall surface of the body of the container body 60. An upward projecting piece 64a and a downward projecting piece 64b provided on a pair of assembling plates 63a and 63b of a concave hole handle body 61 formed on the upper and lower surfaces are fitted and fixed respectively, and a handle as shown in the figure is formed. It is molded into a large container with

The large container with a handle formed in this manner is assembled so that the handle does not rattle between the handle 61 and the container body 60 and the handle does not come off. And upper and lower assembled plates 63a, 63
Since the assembled beam plate 65 is connected between b, even when the container falls to the floor surface from the handle portion 62 side and receives an impact force directly on the handle portion, the upper and lower assembled plates are directed outward. Since the space is not deformed due to a strong force, the container does not crack at the assembly portion, and is a very safe large-sized container with a handle.

In recent years, disposal of waste such as containers discharged in large quantities due to mass consumption has become a social problem, and effective utilization of resources has been demanded.
Local governments throughout the country collect and recycle used containers and other items, and include polyethylene terephthalate (PET) resin containers. Therefore, in order for each company to reuse (recycle) the collected waste PET resin containers as industrial resources in order to respond to the demands of the local government, impurities from the collected waste should be included. It is an essential requirement that only pure PET resin is taken out, and a PET resin mixed with foreign matter has no value as a recycled material.

However, various types of PET currently used are used.
Products in resin containers are labeled with various printed labels, metal is used for sealing lids,
In addition, the handle body is made of resin of different materials such as polypropylene, and there are many problems compared to products manufactured in consideration of recycling as industrial resources. I am blocking.

When foreign matter is mixed in the recovered PET resin,
Pure PET as it has no value as a recycled material
As a means for taking out and collecting only the resin, in order to separate ink or paper from a PET resin container with a label,
It is possible by dissolving and separating with caustic soda,
In addition, it is possible to separate polypropylene and metal by specific gravity, but for that purpose, large-scale equipment is required. It is impossible to recover only the resin.

In consideration of the above various circumstances, even in a PET resin container with a handle, the handle body is made of PET resin of the same material as that of the container body. It is best to use PET resin for the other parts and use PET resin for the whole container. Also, if you use a tack label that is easy to peel off from the container body, equipment will be used. Recycling is possible even for a small number of traders, and reuse as industrial resources is progressing. Therefore, it has become necessary to develop containers using PET resin for all of such cases.

In view of the above, a large container in which a PET resin container with a handle is most frequently used at present is replaced with a conventional polypropylene (PP) resin handle.
In order to develop a container using a handle made of resin, we repeatedly conducted trial production experiments of attaching handles made of PET resin with various shapes according to the conventional molding method. First, a handle having a conventional U-shaped structure as shown in FIG. 13 is formed by injection molding PET resin, and then, as shown in FIG. 1, the handle 14 is inserted into a mold of a blow molding apparatus. After setting, P
A preform made of ET resin was loaded into a mold, blow-molded and insert-molded at the same time, and the protrusion of the handle was molded and attached so that the body of the container body was wrapped. It has been found that various problems occur.

(1) By changing the material of the handle body from the PP resin to the PET resin, at the time of blow molding, the handle body and the preform rupture from a portion in contact with the preform, and most containers are torn. Was. (This is because PET resins heated above the glass transition point are mutually weldable and very slippery. If preforms heated to about 120 ° C. overlap each other, they are attached with an adhesive. (2) Since PET resin has very poor slippage, even in the case of a molded container, the contact between the handle and the preform in the process of molding can cause damage. Therefore, when molded into a container, it is magnified several times, resulting in poor appearance. (3) Due to the characteristics of blow molding, the upper side inside the protrusion of the handle body has poor shapeability, but the lower side has good shapeability. As shown in FIG. 5, the notch portion 59 is generated, and the notch portion 59 is deformed as indicated by an arrow due to the impact force at the time of dropping, and a crack is generated from this portion. As described above, the handle body made of PP resin or the like currently used is simply replaced with a handle body made of PET resin as it is,
Blow molding a preform made of PET resin to PE
The use of a container with a handle made of T-resin prevents problems such as rupture of the container during blow molding, abrasion between the handle and the preform, and cracking of the container wall due to the impact when dropped. Will cause.

Then, as a result of a detailed investigation of the cause of the above-mentioned problem, it was found that the cause was as follows. (1) The cause of poor slippage In the conventional handle body structure, the protrusion of the handle body rises vertically from the assembled plate, but if the height is too high, holes are drilled from the corners. There has occurred. Further, the location of occurrence was irrelevant to the left and right positions of the projection, and the location of the projection was ruptured from above or below the projection depending on molding conditions. (2) Cause of damage to the preform by the handle body If the amount of stretching after the preform hits the handle body increases, the container tends to burst during molding. That is, when the diameter of the container is increased, the amount of stretching after the preform hits the handle increases, so that the container is easily ruptured. In addition, when the distance between the handle body and the preform in the molding die is short, abrasion occurs cheaply, and when the distance is long, the preform is stretched and then assembled to the handle, so that it becomes thin and easily ruptured. In addition, the mounting strength of the handle is reduced. That is, when the distance between the two is reduced, the rupture becomes difficult, but when the distance is too short, abrasion occurs during molding. (3) About the cause of cracks when dropping When the handle body is formed into a U-shape, the impact force at the time of dropping on the gripping body concentrates on the protrusion, so cracks are likely to occur from the part, Since the buckling of the drop impact is generated on the back side of the grip portion, a crack is easily generated from the projection.

Injection molding of a PET resin to form a handle having the same structure as the conventional handle as shown in FIG. 12 and FIG. 14 is simply performed by insert molding by blow molding using the same molding method as the conventional one. Since the handle body and the container body are made of the same resin when molded, the body wall portion of the container body that expands and deforms is poorly slid and easily ruptured. Tried something like that. (A) A lubricant such as silicon was applied to the surface of the handle, or the surface of the handle was surface-smoothed, but the molding effect was not so significant. On the other hand, the application strength of the handle body shows a variation in the mounting strength of the handle body and a decrease in the strength is also recognized. (B) Although the height of the mounting protrusion of the handle was reduced or reduced, it was found that the mounting strength of the handle was reduced and the handle was easily pulled out, so that it was not practical.

[0020]

SUMMARY OF THE INVENTION According to the present invention, a preform molded from a PET resin is mounted in a blow mold and blow-molded into a hollow container, and at the same time, is set in the mold. Insert a handle made of PET resin and place it in a PET resin container body.
When blow molding a large hollow container equipped with a handle made of resin, by improving the slip between the preform to be stretched and the fixed handle, the container is prevented from bursting during blow molding. At the same time, blow molding is performed so that scratches due to the handle body do not occur on the body wall surface of the container body, and the formed handle-equipped container may be detached from the container body even when a strong external force is applied. It is another object of the present invention to provide a container in which a wall is not cracked by a drop impact when the container is dropped.

[0021]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a structure of a handle made of PET resin for improving the slip between a preform and a handle. Is formed in a shape in which the rising surface of the projection vertically hanging on the assembly plate is formed in a smooth shape, and the area where the projection and the preform contact each other is small. Also, in order to prevent abrasion of the container surface due to rubbing between the preform and the handle, the distance between the preform and the handle is set farther than before and set so as to be a uniform distance and molded. I do. Furthermore, in order to prevent cracks from entering the wall surface of the container due to the buckling of the handle part due to the impact at the time of the fall, a reinforcing beam is provided in a bridge shape between the mounting plates of the handle body to form a ring-shaped structure. Make sure the board does not deform.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a pair of assembling plates 43a and 43b are provided at the upper and lower ends of a handle plate 42 by injection molding PET resin to form a U-shape. In the handle 41 formed by projecting the projections 44a and 44b outward on the plate, the projection 43
The side surfaces 44c, from which the a and 43b rise from the mounting plates 44a and 44b, are inclined to form a smooth shape with a slightly lower height.
A reinforcing beam 45 is provided in a bridge shape between 3a and 43b to form a handle 41 having a structure as shown in FIGS. 3 (a) and 3 (b).

The handle 41 formed as described above is
After setting in the blow mold 10 as shown in FIGS. 1 and 2, a preform P formed by using a PET resin is loaded into the mold, and then a normal blow molding operation is performed. By insert molding, the handle 41
Molds a large hollow container with a handle attached to the body of the container. The hollow container with a handle formed in this manner is a conventional handle 41 'having a structure in which a protrusion 44''is vertically raised from an assembly plate 43' of the handle as shown in FIG. 3 (c). A handle body 4 having a structure in which right-angled corners 44'd and 44'e are present at the upper and lower portions of the protrusions
Compared to 1 ', when the preform is stretch blown, there is no resistance at the corners and the moldability is improved, preventing the container from being ruptured during blow molding although not completely. In addition, it is possible to prevent the molded container from being damaged by the impact force when the container is dropped. However, there are still some scratches left on the container wall due to the handle, and there is room for improvement. Therefore, in order to assemble the handle made of PET resin of the present invention into a large hollow container, Various innovations were made.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a large hollow container with a handle made of PET resin according to the present invention. Embodiment 1 FIG. A pair of mounting arm plates are provided at the upper and lower ends of the handle plate to form a U-shape, and a mounting projection is provided on the mounting arm plate so as to protrude outward. Assembling protrusion 44 raised from the assembling arm plates 43a, 43b
The end faces 44c of the a and 44b are formed to have a smooth shape formed by inclining, and the mounting arm plates, which are on the back side of the protruding portions, are connected in a bridge shape by reinforcing beams 45.
A handle body 41 having a structure as shown in FIGS.
Molded by injection molding of PET resin.

The handle 41 thus formed is set in a blow mold 10 as shown in FIGS. 1 and 2, and a preform P in which a PET resin is injection-molded is mounted in the mold. By performing blow molding operation from
The handle 41 was insert-molded into the body of the hollow container to form a large hollow container with a handle. As a result, the moldability was considerably improved as compared with the conventional type, and the container was less likely to burst at the time of blow molding, but it was not perfect, and scratches by the handle were still seen. The reason for this is that although the projections 44 of the handle body 41 are formed with a gentle surface, some corners still remain, and the surface of the projections 44 has a preform. Since the preform is formed as a flat surface so as to be parallel to the center line of P, it is considered that the thickness of the preform may not easily increase during blow molding.

Embodiment 2 FIG. Instead of the handle used in the first embodiment, as shown in FIG. 4, a pair of assembly arm plates 33a and 33b are provided at the upper and lower ends of the handle plate 32 to form a U-shape and the mounting arm. End surfaces 3 of the mounting projections 34 raised from the mounting arm plate 33 in the handle 31 having a structure in which the mounting projections 34a and 34b are projected outward from the plate.
4c is formed in a large arc shape to make the shape smooth without any corners, and the surface of the projection is made of a preform P
The handle body 3 has a surface inclined so as to be outward with respect to the center line of the above, and has a structure in which the assembling plates 33, which are on the back side of the projections, are connected in a bridge shape by reinforcing beams 35.
1 was molded by injection molding of a PET resin.

After the thus-formed handle 31 is set in the blow mold 10 in the same manner as in Example 1, a preform P in which a PET resin is injection-molded is mounted in the mold. Perform the blow molding operation, and
1 was insert-molded into the body of the hollow container to form a large hollow container with a handle. As a result, the rupture of the container during blow molding is further reduced as compared with Example 1.
Although the scratches caused by the handle body were reduced, the outer shape of the end face 34c of the assembly protrusion 34 of the handle body 31 was made to have an arc shape so that there was no corner portion, and at the same time, the surface of the assembly protrusion was By making the surface inclined with respect to the center line of the preform, it can be considered that the effect is obtained by making the preform slip easily during blow molding.

Embodiment 3 FIG. In the handle 41 formed in the structure as shown in FIG. 3 used in the first embodiment, the surface of the assembly projection 44 is in contact with the preform P on the surface of the handle as shown in FIG. 44d of parallel vertical grooves formed in irregularities
Was formed by injection molding of PET resin, the handle was set in a blow mold, and a large hollow container with a handle was blow-molded in the same manner as in Example 1. As a result, rupture of the container at the time of blow molding was extremely reduced, and abrasion of the wall surface due to the handle body was also reduced. This is because the area of the surface of the projection 44 contacting the preform P was reduced. It is considered that the slipperiness between the two was improved.

Embodiment 4 FIG. Similarly, the surface of the protrusion 44 of the handle 41 used in the first embodiment is formed into a cylindrical shape as shown in FIG.
Example 1 is constituted in a handle body 41 formed with
A large hollow container with a handle was blow-molded by the same molding method as described above. As a result, since the surface area of the projections 44 in contact with the preform P was reduced, the container was hardly ruptured at the time of blow molding, and there was almost no abrasion of the container wall by the handle. Better results than when the

Embodiment 5 FIG. As shown in FIG. 5A, the surface of the projection 44 of the handle 41 in the first embodiment is opened outward at an angle of about 45 degrees to both sides from the center line of the projection surface. The handle 41 was formed by forming the parallel groove 44e, and the handle was blow-molded into a large hollow container with a handle by the same forming method as in the first embodiment. As a result, the container was not ruptured at the time of blow molding, and almost no scratches on the wall surface due to the handle were recognized, probably because the uneven surface of the projection 44 in contact with the preform P was in the expansion direction of the preform. However, better results were obtained than in Example 3 because the shape of the uneven surface of the projections was oriented in the direction of expansion of the preform. It is considered that the slipperiness between the preform and the preform was improved.

Embodiment 6 FIG. As shown in FIG. 5 (c), an arc-shaped groove 44f in which the surface of the protrusion 44 of the handle 41 in the first embodiment is formed into concentric concavities and convexities centered on the center of the tip of the protrusion as shown in FIG. The handle 41 was formed, and a large hollow container with a handle was blow-molded from the handle by the same molding method as in Example 1. As a result, the container was not ruptured at the time of blow molding, and almost no scratches on the wall surface due to the handle were observed, and the same good results as those in Example 5 could be obtained.

Embodiment 7 FIG. Subsequently, in a handle having a structure in which the outer shape of the protrusion used in the second embodiment is formed in an arc shape and the surface is inclined with respect to the center of the preform, the portion where the protrusion 24 contacts the preform P A parallel vertical groove 24d having the same shape as that of the third embodiment and shown in FIG. 5D is provided on the flat surface, and a handle 21 having a shape as shown in FIG. 6 is formed by injection molding of PET resin. After that, the handle was set in a blow mold 11 and then blow-molded in the same manner as in Example 1 to form a large hollow container with a handle. As a result, the container was not ruptured at the time of blow molding, and abrasion of the wall surface due to the handle was hardly observed, and a better result than in Example 3 was obtained.
Further, in the above-mentioned handle, as shown in FIG. 7, the peripheral edge of the vertical groove 24d 'provided on the surface of the projection 24' is edged with a smooth flat surface, and the edge is chamfered. It was found that the handle body 21 ′ having the R-shaped structure had better preform slippage and no scratches were recognized on the container wall surface, and a better result could be obtained.

Embodiments 8 to 10. Similarly, in the handle body 31 having the structure as shown in FIG. 4 used in the second embodiment, the front surface of the protrusion having the end face formed in an arc shape contacts the preform with the flat surface, Similarly to the surface shapes in Examples 4 to 6 described above, the shape shown in FIG. 5A (Example 8), the shape shown in FIG. 5B (Example 9),
Using each of the handles formed in the shape (Example 10) shown in FIG. 5C, blow molding was performed in the same manner as in Example 7 to form a large hollow container with handles. In the case of the body, better results were obtained than in the case of using the handle in Examples 4 to 6.

From these results, it can be seen that the handle 41 is more easily gripped than the handle 41 having the structure shown in FIG. The handle 31 having the structure shown in FIG. 4 in which the end surface of the mounting protrusion rising from the mounting arm plate of the body is formed in a large arc shape and has a smooth shape with no corners is further provided. By providing a groove or the like on the surface of the surface to reduce the contact area of the surface of the protrusion that contacts the preform during blow molding, or by providing a flat edge on the periphery of the groove or the like provided on the surface of the protrusion, It was also found that the moldability was further improved.

However, even if a hollow container is formed by using the handle having a reduced contact area of the projection as described above, the diameter of the container becomes large when forming a container larger than a conventional product. However, since the amount of the preform stretched after contacting the handle body also increased, it was found that cracks were likely to occur in the container wall during blow molding, and it was difficult to completely prevent the container from bursting. . Therefore, in order to reduce the amount that the preform is stretched after coming into contact with the handle, as shown in FIG.
By providing a wall portion 29 for preventing overstretching while adding R, rupture during blow molding can be suppressed.
Distance L between protrusion 24 of handle 21 and overextension prevention wall 29
It is found that L is preferably closer, but L is preferably 15 to 25 mm.

If the distance between the preform and the handle is short, abrasion of the wall surface by the handle is likely to occur.
On the other hand, when the distance is far, the preform is stretched and then entangled with the handle body, so that the preform is thinned, easily broken, and the strength is reduced. However, in any of the above-described embodiments, the surface of the handle plate in contact with the preform of the projection of the mounting plate is formed as a flat surface as shown in FIG.
When insert-molding these grips, the distance d between the preform and the grips is different between the center of the protruding surface and the end thereof. Although the center part must be brought close to the center when performing the operation, the surface of the protrusion 24 of the handle body is changed to the state shown in FIGS.
As shown in (1), it can be improved by making the surface curved so as to face the preform surface. In particular, when the surface of the projection 24 is formed into a curved surface concentric with the outer periphery of the preform, the distance D between the preform P and the projection 24 of the handle 21 is kept uniform. It can be considered that a better effect can be obtained.

Embodiment 11 FIG. A pair of assembling arm plates 13 are provided at the upper and lower ends of the handle plate 12 to form a U-shape, and an assembling protrusion 14 is provided on the mounting arm plate so as to protrude outward. In this case, the end surface 14c of the assembling protrusion 14 rising from the mounting arm plate 13 is formed in a large arc shape so as to have a smooth shape with no corners, and the front surface of the assembling protrusion 14 is pressed. A circular structure as shown in FIG. 10 was formed by forming a concentric curved surface approximating the wall surface of the reform and connecting the assembling arm plates 13 of the protrusions in a bridge shape with reinforcing beams 15. Handle 11
Was molded by injection molding of a PET resin.

After the handle 11 thus formed is set in a blow mold 10 as shown in FIGS. 1 and 2, a preform P in which a PET resin is injection-molded is mounted in the mold. By performing blow molding operation from
A large hollow container with a handle was formed by insert-molding the handle 11 into the body of the hollow container. As a result, the container was not ruptured during blow molding, and the abrasion caused by contact with the handle was reduced as compared with Example 2, but this was due to the end face 14c of the assembling projection 14 of the handle 11. In addition to eliminating the corners and making the outer shape smooth arc, the surface of the projection 14 of the assembly plate is curved like the preform P, so that the center of the projection 14 It is considered that the distance between the preform P and the preform P can be kept constant, and the distance between the preform P and the preform P can be kept equal to that of the conventional one. I understood.

Embodiment 12 FIG. Subsequently, the shape of the end face of the protrusion is formed in an arc shape as used in Example 11, and
A handle body 11 having a structure in which the front surface of the projection is curved.
Further, in the same manner as in the seventh embodiment, the surface of the portion where the protrusion 14 ′ is in contact with the preform P is shown in FIG.
After forming the handle 11 ′ by injection molding of PET resin into a structure provided with parallel vertical grooves 14 d ′ having an uneven shape as shown in FIG. In the same manner as in Example 11, a large hollow container with a handle was insert-molded by blow molding. As a result, the container was not ruptured at the time of blow molding, and abrasion on the wall surface due to the handle was hardly observed, and a better result than that of Example 11 could be obtained.

Embodiment 13 FIG. Similarly, in the first embodiment,
In the handle body 11 'having the structure used in FIG. 2, the surface of the portion where the front surface of the projection 14' is in contact with the preform is replaced by a parallel vertical groove 14d 'having an uneven shape, as shown in FIG.
After the handle having the shape (44a ′) shown in FIG. 5A, the shape (44b ′) shown in FIG. 5B, and the shape (44c ′) shown in FIG. 5C is formed by injection molding of PET resin. Using these grips, blow molding was performed in the same manner as in Example 12 to form a large hollow container with a grip, and a comparative study was conducted with each of the above Examples. As a result, for each of the handle bodies, much better results were obtained than in the above-described Examples 1 to 11 as in Example 12.

From the above results, the end face of the assembling and assembling projection of the handle body is formed in an arc shape, thereby eliminating abrasion at corners of the preform which is rapidly expanded and expanded and preventing rupture. By reducing the contact area with the preform by forming the surface of the projecting portion in an uneven shape, it is possible to eliminate rupture due to frictional resistance, and furthermore, the front shape of the projecting portion can be reduced. By forming the preform on a curved surface concentric with the preform, the distance between the protruding portion and the preform to be stretched can be maintained at an appropriate and uniform value, thereby preventing abrasion and rupture. It was also concluded that rupture could be prevented by providing a wall for preventing overstretching on the back surface of the protrusion.

[0042]

The handle body having the structure as in the present invention is
Since the protrusion, which is an attachment part to the container in contact with the preform that expands and expands, has a shape that is smooth and has very small frictional resistance, the handle body and the container body may be made of the same resin material. However, the protrusion of the handle body and the preform do not immediately adhere to each other, and the preform does not scratch, and especially when blow molding using polyethylene terephthalate resin, rupture of the container occurs. This makes it possible to form a hollow container with a handle without performing. In addition, since the handle body and the container body can be molded using the same resin material, a process and equipment for separating the collected used containers for reuse are no longer required, so that recycling is not required. Costs can be reduced and reuse as resources can be facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a molding die when insert-molding a handle of the present invention.

FIG. 2 is a cross-sectional view of the molding die shown in FIG.

FIG. 3 is a diagram showing a prior art of the present invention.

FIG. 4 is a view showing the shape of the first embodiment of the handle of the present invention.

FIG. 5 is a view showing various shapes of the front surface of the mounting projection of the handle of the present invention.

FIG. 6 is a view showing a modified example of the handle shown in FIG. 5;

FIG. 7 is a diagram showing an improved example of the handle shown in FIG. 5;

FIG. 8 is a view showing the shape of another embodiment of the handle body of the present invention.

FIG. 9 is a view for explaining the handle of the present invention.

FIG. 10 is a view showing the shape of another embodiment of the handle body of the present invention.

FIG. 11 is a view showing a modification of the handle shown in FIG. 10;

FIG. 12 is a known example of a container using a conventional handle.

FIG. 13 is a view showing a conventional handle body.

FIG. 14 is a view showing a container provided with an improved conventional handle body.

FIG. 15 is an explanatory view of a container wall provided with a conventional handle.

[Explanation of symbols]

 Reference Signs List 10 Molding die 11, 11 'Handle 12, 12' Handle plate 13, 13 'Assembly arm plate 14, 14' Assembly protrusion 15, 15 'Reinforcement beam 44' Mounting protrusion 44a ', 44d' Vertical groove Concavo-convex surface 44b 'Cylindrical concavo-convex surface 44c' Arc-grooved concavo-convex surface 60 Container showing a prior example of the present invention 61 Prior example of handle body of the present invention P Preform

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takao Otsuki 1, 633, Nishihama-Kitacho, Ako City, Hyogo Prefecture Inside the Ako Plant of Yoshino Kogyosho Co., Ltd. (72) Inventor Shigeo Kamata 3-2-6 Oshima, Koto-ku, Tokyo 4F208 AA24 AD05 AG07 AG29 AH55 LA02 LA05 LB01 LB12 LG01 LG28 LJ05

Claims (13)

[Claims] 1. A pair of mounting arm plates are provided at the upper end and the lower end portion of a handle plate to form a substantially U-shape. In the handle body made of thermoplastic synthetic resin formed so as to be attachable to the upper side wall surface of the synthetic resin hollow container body, the corners of the end faces of the assembling protrusions raised from the mounting arm plate are smoothed. A synthetic resin hollow container suitable for blow molding, characterized in that a reinforcing beam is provided between the assembling plates on the back side of the protruding portions and is connected annularly to form a handle body. Handle body. 2. A pair of mounting arm plates are provided at the upper end and the lower end of the handle plate to form a substantially U-shape. In the handle made of thermoplastic synthetic resin formed so as to be attachable to the upper side wall surface of the synthetic resin hollow container main body, the end face of the assembling protrusion raised from the mounting arm plate has a smooth arc shape. A synthetic resin hollow container suitable for blow molding, characterized in that a reinforcing beam is provided between the assembling plates on the back side of the protruding portions and is connected annularly to form a handle body. Handle body. 3. The preform according to claim 1, wherein a surface of the mounting projection that is in contact with the preform is formed as a surface that is inclined outward with respect to a centerline of the preform. Handle of hollow synthetic resin container. 4. The synthetic resin hollow container according to claim 1, wherein a surface of said mounting projection portion in contact with said preform is formed into a curved surface facing said preform surface. Handle body. 5. The synthetic resin hollow according to claim 1, wherein an overstretching preventing wall is provided at a portion where the mounting arm plate on the rear side of the mounting protrusion is joined to the handle plate. The handle of the container. 6. The composition according to claim 1, wherein a large number of groove-shaped irregularities are formed on a surface of the mounting projection portion where the preform contacts, thereby reducing a contact area. Handle body of resin hollow container. 7. A method in which a large number of groove-shaped irregularities are formed on a surface of the mounting projection portion which contacts the preform to reduce a contact area, and a peripheral portion thereof is formed as a flat surface. The handle of the synthetic resin hollow container according to any one of claims 1 to 5. 8. The method according to claim 6, wherein a large number of groove-shaped irregularities formed on a surface of the protrusion that contacts the preform are formed in a groove shape parallel to the longitudinal direction. Handle of a synthetic resin hollow container. 9. A large number of groove-shaped irregularities formed on a surface of the projection that comes into contact with the preform are formed into parallel grooves that are inclined outward from both sides of the center line of the handle toward both sides. The handle of a synthetic resin hollow container according to claim 6 or 7, wherein 10. The method according to claim 1, wherein the plurality of groove-shaped irregularities formed on the front surface of the projection are formed in an arc-shaped groove concentrically outward from the position of the center line of the handle. Item 8. The handle of the synthetic resin hollow container according to item 6 or 7. 11. The synthetic resin hollow according to claim 6, wherein a number of groove-shaped irregularities formed on the front surface of the projection are formed by projecting a columnar projection. The handle of the container. 12. The handle of a synthetic resin hollow container according to claim 1, wherein the handle is formed by injection-molding a polyethylene terephthalate resin. 13. A hollow container with a handle formed by blow molding polyethylene terephthalate resin obtained by insert molding the handle made of polyethylene terephthalate resin according to claim 11.