JPH05139438A - Synthetic resin made bottle and method for its production - Google Patents

Abstract

PURPOSE:To reduce the amount of synthetic resin material required for forming a bottle body, make its incineration easy and provide an easy, safe and good method for its production. CONSTITUTION:An adequately thin-walled cylindrical tube 5 of a bottle body 1 is fitted into a paper tube 13 having a bottom lid 15 engaged with its lower end and moved therein to fully spread out an adhesive agent 19 which has previously been applied to the inner peripheral surface of the paper tube 13, whereby the bottle body 1, the paper tube 13 and the bottom lid 15 are firmly attached together with the adhesive agent 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin bottle body formed by combining a thin resin biaxially stretch blow molded synthetic resin bottle body and a hard cardboard paper tube, and this bottle. The present invention relates to a method for manufacturing a body.

[0002]

2. Description of the Related Art Since a general synthetic resin bottle bottle stretch-blow-molded must have a stable self-supporting function and a self-shape-retaining ability, it is possible to improve the physical properties by the insufficient stretching amount at the bottom of the bottle. There were dissatisfactions and complains that there was a limit to the extent to which expensive synthetic resin materials consumed to mold one bottle could be reduced.

As a means for solving the dissatisfaction in improving the physical properties due to the insufficient amount of stretching of the bottom of the bottle, there is a means for making the bottom of the bottle a special structure, or a base cup which is a separate body for providing the legs is used for the bottle main body. There is a means to attach it to the bottom of the bottle, but since these means need to give the bottle body itself the ability to retain its shape, the consumption of synthetic resin material required to mold one bottle body There was a limit to the extent of reduction.

As a conventional technique for solving the dissatisfaction of improving the physical properties due to insufficient stretching of the bottom of the bottle and for sufficiently reducing the consumption of the synthetic resin material required for molding one bottle body, the bottle body made of a synthetic resin is known. There is a means for biaxially stretch-blow molding a portion other than the mouthpiece into a bag shape, and incorporating this bottle into the paper box with the mouthpiece.

[0005]

This prior art is capable of imparting sufficient stretching deformation to the bottom of the bottle body, and the consumption of the synthetic resin material required to mold one bottle body is sufficiently reduced. However, since all the work of assembling the bottle body into the paper box is a manual work and the work content is troublesome, there is a problem that the work efficiency is extremely poor.

Assembling of the bottle body to the box is accomplished by tightening and fixing the mouth cylinder of the bottle body to the top of the box and adhesively fixing the bottom of the bottle body to the bottom of the box. Although the assembling state of the box is stable, the adhesive fixing of the bottle body to the bottom of the box must be achieved at the same time as the work of assembling the box, that is, by tightening and fixing the mouth cylinder of the bottle body to the top of the box, For this reason, there is a problem in that it is not possible to accurately position the adhesive fixing position of the bottom of the bottle body to the bottom of the box.

Since the whole bottle body except the mouth cylinder is bag-shaped, its shape and posture are not stable, and therefore, the bottom portion of the bottle body is not adhered and fixed to the bottom of the box. There was a problem that would occur.

Further, since the outer appearance of the container is box-shaped, the appearance is not interesting, and there is a problem that it is completely unsuitable as a container for high-priced products containing cosmetic liquids and the like.

Therefore, the present invention was devised in order to solve the above-mentioned problems in the prior art, and utilizes a stable shape such as the tubular shape of the body of the bottle body to provide a reinforcing member for the bottle body. Achieving stable assembly is a technical issue, and as a result, the assembly work of the bottle body and the reinforcing member is simple and accurate, and the adhesive fixing of the bottle body and the reinforcing member with an adhesive is easy and accurate. The goal is to achieve it reliably.

[0010]

Means for Solving the Technical Problem The means of the present invention for solving the above technical problem is a thin wall which is continuously provided from a lower end of a shoulder wall in which a mouth tube is erected at an upper end and a ridge is provided at a lower end of an outer peripheral surface. Taper cylinder piece with a diameter reduced downward at the lower end of the fitting part where the outer peripheral surface, which is a continuous portion with the shoulder wall, has an engaging groove and an air vent groove is formed over the entire outer peripheral surface height range. A small diameter portion provided with a concave circumferential groove-shaped reinforcing rib is continuously provided through the portion, and a bottomed short-bottomed tubular portion having a reduced diameter is continuously provided at the lower end of the small diameter portion through a step portion. Having a bottle body, having a height almost equal to that of the barrel of the bottle body, tightly fitted on the fitting portion of the bottle body, and having an inner collar shape that engages with the engagement groove of the bottle body at the upper end of the inner peripheral surface. Having a paper tube made of hard cardboard around which a burr piece is provided, an inner cylinder into which the bottom of the bottle body is loosely fitted at the upper peripheral edge of the bottom plate, and Having a bottom lid erected an outer cylinder for fitting the lower end portion of the paper tube between the cylinder, having an adhesive for adhering and fixing the bottle body and the paper tube and the bottom cover, in.

As a means for assembling and manufacturing a bottle body composed of the bottle body, the paper tube and the bottom lid of the present invention, the bottom lid is fitted and assembled to the lower end of the paper tube, and the bottom lid is assembled. Apply the adhesive to a part of the lower part of the inner peripheral surface of the attached paper tube with a thickness larger than the gap formed between the paper tube and the small diameter part of the bottle body. First, the bottle body is fitted into the paper tube from above until the burr piece of the paper tube engages with the engagement groove of the bottle body.

[0012]

In the bottle body, the head composed of the shoulder wall and the mouth tube has the same wall thickness as the ordinary biaxially stretch blow molded bottle body made of synthetic resin, and the barrel body is the main part of the bottle body. Since only one is sufficiently thin, the amount of synthetic resin material required to mold one bottle body is much smaller than that in the case of manufacturing an ordinary bottle of the same size.

As described above, since the barrel of the bottle body has a sufficiently thin wall thickness, there is concern about the mechanical strength of the container, that is, the self-shape retaining ability and the buckling strength, and especially the bottle body. There is a great concern about the lateral crushing strength during the handling, but this lateral crushing force is dealt with by providing a reinforcing rib around the small diameter portion.

In the bottle body, the entire barrel whose mechanical strength is not sufficiently high is fitted into a combination of a paper tube and a bottom lid having a sufficiently high mechanical strength, so that the paper tube and the bottom lid are The outer shell of the bottle body is composed of a head portion having a normal wall thickness of the bottle body, a paper tube made of a hard cardboard, and a bottom lid having a normal strength, since it is combined with a reinforcing member which is a combination of Therefore, the container as a whole exhibits sufficient strength.

The appearance of the bottle body is such that the head of the bottle body protrudes from the upper end of the combination of the bottomed tubular paper tube and the bottom lid, so that it is almost the same as a normal bottle body. There is no sense of incongruity, and since the appearance of the bottle body is made of paper tube, it is possible to make a preferable decoration on the outer surface of the bottle by using the ease of decorating the paper tube. is there.

Since the bottom lid is only required to provide good legs, it is not limited by its molding material, and therefore, the bottom lid is provided with a filler for reducing calories. By manufacturing with the mixed recycled polyolefin-based synthetic resin material, it becomes extremely easy to incinerate an empty container bottle.

In assembling the combination of the paper tube and the bottom lid and the bottle body, the combination of the paper tube and the bottom lid has a bottomed cylindrical shape, and the fitting portion of the barrel of the bottle body is fitted. Is set to a diameter dimension that fits tightly into the paper tube, so as the insertion of the barrel into the paper tube progresses, the air in the combination of the paper tube and the bottom lid is pushed in. The air in the combination of the paper tube and the bottom cover is pushed by the body tube fitted into the paper tube and is exhausted to the outside through the air vent groove formed on the outer peripheral surface of the fitting portion. The bottle body can be fitted and assembled smoothly to the combination of the bottom cover and the bottom cover.

The assembling of the bottle body with respect to the combination of the paper tube and the bottom lid is achieved only by a simple fitting process of the barrel of the bottle body with respect to the paper tube, and the fitting and assembling part of the bottle body is Since the burr piece is accurately regulated at the position where it is engaged with the engagement groove of the bottle body, the assembly alignment can always be achieved accurately.

During the fitting and assembling operation of the barrel of the bottle body into the paper tube, the gap between the inner peripheral surface of the paper tube and the outer peripheral surface of the small diameter portion of the bottle body is larger than the inner peripheral surface of the paper tube. Since the adhesive is pre-applied with the thickness, the lower part of the barrel that has been inserted into the paper tube will move toward the lower end of the paper tube while squeezing the adhesive, and thus the inner peripheral surface of the paper tube. The adhesive applied to the lower part is pushed by the barrel and spreads downward, filling not only the space between the paper tube and the barrel, but also between the barrel and the bottom lid. The paper tube and the bottom lid are bonded and fixed together.

At the time when the insertion of the barrel to the paper tube is completed, the adhesive has not solidified yet,
The immobilization between the bottle body, the paper tube, and the bottom lid is not yet achieved, but the paper tube and the bottom lid are assembled together in a fixed posture by a fitting assembly. The paper tube and the bottle body will be assembled together in a fixed posture by the tight fitting of the fitting part of the barrel of the bottle body to the paper tube, whereby the bottle body and the bottle body until the adhesive is fixed. The mutual assembling posture of the paper tube and the bottom lid is relatively firmly and stably maintained.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view in which a combination of a paper tube 13 and a bottom lid 15 of a bottle according to the present invention is longitudinally cut. A bottle body 1 which is a polyethylene terephthalate resin biaxially stretch blow molded bottle has a lower end on an outer peripheral surface. At the upper end of the shoulder wall 3 having a substantially hemispherical shell shape around which the ridge 4 is provided, the mouth tube 2 having the thread engraved on the outer peripheral surface is erected continuously, and the same degree as a normal synthetic resin bottle body is provided. The head portion is made of a thick wall, and a bottomed cylindrical body tube 5 is continuously provided from the lower end of the shoulder wall 3. The body tube 5 is larger than that of a normal bottle of this type. It has a wall thickness of 1/2 to 1/5,
As a result, a great reduction in the amount of synthetic resin material required to mold one bottle body 1 is achieved.

The barrel 5 of the bottle body 1 has a fitting portion 6 in which an engaging groove 7 is provided on the outer peripheral surface of the upper end which is a continuous portion with the shoulder wall 3, and a taper cylinder at the lower end of the fitting portion 6. It is composed of a small-diameter portion 10 that is continuously provided via the piece portion 9, and a bottom 12 having a short cylindrical shape with a bottom that is continuously provided at the lower end of the small-diameter portion 10 with a reduced diameter through a step portion.

Two air vent grooves 8 are provided on the outer peripheral surface of the fitting portion 6 in the form of vertical grooves, and are provided at symmetrical positions.
It is possible to more smoothly achieve the escape of air from the inside of the paper tube 13 when fitting and assembling into the paper tube 13.

The small-diameter portion 10 is provided with a plurality of reinforcing ribs 11 at substantially equal intervals. The plurality of reinforcing ribs 11 enhance the mechanical strength against crushing of the thin barrel 5 itself.
The contact area with the adhesive 19 is increased so that the adhesive fixing force of the adhesive 19 is increased.

The diameter of the bottom portion 12 is reduced with respect to the small-diameter portion 10 via the step portion because the layer of the adhesive 19 is located between the cylindrical wall of the bottom portion 12 and the inner cylinder 17 of the bottom lid 15. This is to form a gap C2 that can be formed.

The paper tube 13 has a linear cylindrical shape having an inner diameter equal to the outer diameter of the fitting portion 6 of the barrel 5, and its height is slightly larger than the height of the barrel 5. There is. A burr piece 14 is projectingly provided on the inner periphery of the upper edge of the paper tube 13, and the burr piece 14 is used when the long paper tube body is cut into a certain size to form the paper tube 13. The cutting operation can be used to easily and surely perform shaping. The outer diameter of the paper tube 13 is set to a value smaller than the outer diameter of the ridge 4.

The bottom lid 15 has an outer diameter equal to the inner diameter of the paper tube 13 at the peripheral edge of the upper surface of a flat disc-shaped bottom plate 16 having a diameter equal to the outer diameter of the ridge 4. Also, a short cylindrical inner cylinder 17 having an inner diameter larger than twice the gap C2 is erected, and a space for the thickness of the paper tube 13 is provided between the inner cylinder 17 and the inner cylinder 17 outside the inner cylinder 17. An outer cylinder 18 having a short cylindrical shape with an outer diameter equal to that of the ridge 4 is provided upright.

Therefore, the maximum outer diameter portion of the bottle is the outer tube 18 portion of the ridge 4 and the bottom lid 15, and the outer diameters of the ridge 4 and the outer tube 18 are equal. When the adjacent bottle bodies are brought into contact with each other, the ridges 4 and the outer cylinder 18 come into contact with each other, so that there is no destabilization of the standing posture due to the contact between the bottles. Can be carried stably, and since the surfaces of the paper tube 13 with the display or decoration on the surface do not contact and rub against each other, there is no risk of deterioration of the display and decoration due to rubbing. ..

When inserting and assembling the bottle body 1 into the combination of the paper tube 13 and the bottom lid 15, the adhesive 19 previously applied to the lower part of the inner peripheral surface of the paper tube 13 is 2 as shown in FIG. The coating is separately applied to three places at substantially equal central angle positions. This is so that the adhesive fixing force of the adhesive 19 works uniformly along the circumferential direction.

As the adhesive 19, hot melt is used, which can obtain a fast adhesive fixing operation, hardly any adverse effect of the solvent, and can obtain an appropriate viscosity accurately by controlling the temperature. Because.

When the barrel 5 of the bottle body 1 is fitted into the paper tube 13, the adhesive 19 applied to the inner peripheral surface of the paper tube 13 is squeezed by the barrel 5 and a part thereof flows downward. , The bottom portion 12 and the inner cylinder 17 of the bottom lid 15 and the bottom plate 16 are infiltrated, and the bottle body 1, the paper tube 13 and the bottom lid 15 are integrally bonded and fixed.

As described above, the adhesive 19 is used for the paper tube of the bottle body 1.
It is applied to the paper tube 13 prior to the fitting and assembling operation to the 13, but since the paper tube 13 has extremely low thermal conductivity, the applied adhesive 19 does not cool and solidify early. Until the bottle body 1 is fitted and assembled, the required fluidity and adhesive force are reliably maintained.

The gap C1 is set to a value as small as possible within a range in which the insertion operation of the barrel 5 into the paper tube 13 can be smoothly achieved and an adhesive layer exhibiting sufficient adhesive force can be formed. Is set so that the value is 0.1 to 0.5.
A range of mm is suitable. In this way, since the gap C1 is set to a small value, the thickness of the adhesive 19 located in the gap C1 is sufficiently thin, whereby the adhesive 19 portion that comes into contact with the extremely small-diameter portion 10 is thin. The thickness of the
The amount of heat of the adhesive can be reduced sufficiently,
Therefore, the occurrence of thermal deformation of the small diameter portion 10 due to the heat of will be prevented.

Compared with this gap C1, the gap C2 is 0.3-
It is set to a large value of about 1.0 mm. This is because the bottle body 1 is a biaxially stretch blow molded product,
Between the bottom lid 15 and the bottom portion 12 of the adhesive 19 in which the wall thickness of 12 is larger than the wall thickness of the small diameter portion 10 and the heat resistance is high correspondingly, and which is squeezed by the barrel 5 and moves downward. This is for facilitating the entry and movement into the paper tube 13 and for smoothly achieving the fitting operation of the barrel 5 into the paper tube 13.

[0035]

Since the present invention has the above-mentioned structure, it has the following effects. The bottle body of the bottle body, which is sufficiently thin, was inserted into the combination of the paper tube and the bottom lid, so the amount of synthetic resin material consumed in one bottle can be significantly reduced. Therefore, the material cost required for bottle manufacturing can be sufficiently reduced.

In the bottle body, only the barrel is fitted into the paper tube, and the head composed of the shoulder wall and the mouth tube is exposed from the upper end of the paper tube. Since the paper tube is the same as the bottle and the body of the bottle is formed by the paper tube, good decoration can be easily achieved, and thus the bottle having a good appearance can be provided.

Since the amount of synthetic resin material constituting one bottle can be reduced, it is possible to reduce the amount of heat calories generated during the incineration process, and thus, when the bottle becomes waste. Incineration becomes easy.

The bottle body is fitted and assembled to the combination of the paper tube and the bottom cover by relatively tightly fitting the fitting portion of the barrel of the bottle body to the upper end portion of the paper tube. The assembled state can be maintained, and thus the adhesive fixing by the adhesive in the exact mutual positional relationship among the bottle body, the paper tube, and the bottom lid can be reliably achieved.

The adhesive is applied to the lower part of the inner peripheral surface of the paper tube,
Since the barrel that fits into the paper tube spreads it out, the adhesive never leaks to the outer surface of the bottle, and a wide bonding area is inevitably obtained. With the three adhesives of the bottom lid and the bottom, reliable, strong and safe adhesion can be achieved.

The adhesive is applied to the lower part of the inner peripheral surface of the paper tube,
Since it is not positioned above this position, even if the bottle body is transparent, the adhesive is hardly visible from the outside due to the paper tube, and therefore the appearance of the bottle body deteriorates due to the adhesive. There is no inconvenience.

[0040]

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of a bottle according to the present invention, which is a longitudinal section of an entire combination of a paper tube and a bottom lid.

FIG. 2 is an exploded view for explaining an assembling operation of the embodiment shown in FIG.

FIG. 3 is an enlarged partial sectional view of an essential part of an assembly portion of the upper end of the paper tube and the bottle body in the embodiment shown in FIG.

FIG. 4 is an enlarged partial sectional view of an essential part showing an adhesive layer forming form in the embodiment shown in FIG.

[0041]

[Explanation of symbols]

 1; Bottle main body 2; Mouth tube 3; Shoulder wall 4; Convex strip 5; Body tube 6; Fitting part 7; Engagement groove 8; Air bleed groove 9; Tapered tube piece part 10; Small diameter part 11; Reinforcing rib 12 Bottom part 13; paper tube 14; burr piece 15; bottom lid 16; bottom plate 17; inner cylinder 18; outer cylinder 19; adhesive C1, C2; gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoji Hayashi 3-17-3 Shioyaki, Kawatoshi, Tokyo Sanla Izheim 107 (72) Inventor Maki Sasahara 2-27-5 Sakainancho, Musashino City, Tokyo President Musashino 303 (72) Inventor Hiroaki Sugiura 3-2-6 Oshima, Koto-ku, Tokyo Inside Yoshino Industrial Co., Ltd. (72) Norio Arai 122 Hibarigaoka, Fujinomiya City, Shizuoka Prefecture

Claims (7)

[Claims] 1. A shoulder tube (3) having a mouth tube (2) standing upright at the upper end and a ridge (4) around the outer peripheral surface lower end, and a thin body tube (5) continuous from the lower end, At the lower end of the fitting portion (6) in which the engaging groove (7) is formed at the upper end of the outer peripheral surface which is a continuous portion with the shoulder wall (3) and the air vent groove (8) is formed over the entire height range of the outer peripheral surface,
A small-diameter portion (10) provided with a concave circumferential groove-shaped reinforcing rib (11) is continuously provided via a taper cylinder piece portion (9) having a reduced diameter, and a step portion is further provided at the lower end of the small-diameter portion (10). A bottle body (1) constituted by connecting a bottom portion (12) having a short tubular shape with a diameter reduced through
It has a height almost equal to that of the above and is tightly fitted onto the fitting portion (6), and an inner collar-shaped burr piece (14) which engages with the engaging groove (7) is provided around the upper end of the inner peripheral surface. A paper cylinder (13) made of hard cardboard, an upper peripheral edge of the bottom plate (16), an inner cylinder (17) into which the bottom (12) is loosely fitted, and the inner cylinder (17) The bottom cover (15) with the outer cylinder (18) into which the lower end of the paper tube (13) is fitted is erected, and the bottle body (1), the paper tube (13) and the bottom cover (15) are fixed by adhesion. Adhesive
A bottle made of synthetic resin consisting of (19). 2. The outer cylinder (18) and the ridge (4) of the bottom lid (15) are made to have a maximum outer diameter portion and both outer diameters are made equal.
Bottle body made of synthetic resin as described in 1. 3. The synthetic resin bottle body according to claim 1, wherein the adhesive (19) faces the lower portion of the bottle body (1). 4. The synthetic resin bottle according to claim 1, 2 or 3, wherein hot melt is used as the adhesive (19). 5. A paper tube (1) having a bottom cover (15) fitted and assembled at its lower end.
An adhesive (19) having a thickness larger than the gap (C1) formed between the paper tube (13) and the small diameter portion (10) of the bottle body (1) is formed on a part of the lower part of the inner peripheral surface of (3). ) Is applied to the paper tube (13) while the adhesive (19) is not solidified, the bottle main body (1) is attached to the paper tube (13) from above.
(1) A method for manufacturing a synthetic resin bottle body in which the burr piece (14) of the paper tube (13) is fitted into the engagement groove (7) of (1). 6. The method for producing a synthetic resin bottle according to claim 4, wherein the adhesive (19) is applied to the lower part of the inner peripheral surface of the paper tube (13) at a plurality of locations along the circumferential direction. .. 7. The method for producing a synthetic resin bottle according to claim 5, wherein hot melt is used as the adhesive (19).