JP3027032B2 - Manufacturing method of squeezed container with label - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A method of manufacturing a labeled squeezable container which can store a viscous liquid material such as food, pharmaceuticals, cosmetics, detergents, industrial chemicals, etc. and squeeze out the contents by holding down a body. It is about.

[0002]

2. Description of the Related Art Conventionally, a container with a label, which is integrally welded to a body of a container body at the time of blow molding, is called an in-mold label container or an IML container, and has been adopted as a rigid container.

[0003]

However, when a label is integrally welded to a squeeze container made of a flexible thermoplastic resin such as low-density polyethylene at the time of blow molding, the container body is thin. Is flexible and flexible, causing wrinkles, blisters and dents around the label and the label itself. However, there is a disadvantage that the welded label is easily peeled off by repeated pressing force and deformation.

Therefore, the present invention requires that the squeezed container itself has an identification function and a design property. Deformability and resilience suitable for squeezing the contents. The label must not be peeled by repeated pressing and deformation during squeezing. Excellent appearance without wrinkles or deformation. It is an object of the present invention to realize a method for producing a labeled squeezed container having excellent characteristics.

[0005]

In order to achieve the above object, a method of manufacturing a squeezed container with a label according to the present invention is to temporarily fix a label on the inner surface of a cavity of a split mold that has been opened, and to use the split metal mold. A blow molding method for disposing a parison made of a thermoplastic resin melted by heating and melting between molds, closing the mold, introducing a pressure fluid into the paris, and integrating the label with the container body during molding, the blow molding method comprising: outside the side edges of the temporarily fixed by said labels
With use of the split molds to form a ridge-forming cavities along the side edges, the thermoplastic resin is characterized in that the elastic modulus were from 500 to 4000 kg / cm ^2. The ridge line forming cavity of the present invention is used for forming a ridge line formed in a split mold, and includes a cavity formed and a protrusion formed.

[0006]

According to the present invention, since the ridges of a reinforcement along the both side edges on the outside of both side edges of the label to squeeze the body of the container is formed, squeezing the body portion of the press-deformation of the original shape It has excellent resilience to the label, no wrinkles, blisters, and dents around the label and the label, and has excellent appearance characteristics without bending the container body from the label part. It is possible to manufacture a squeezed container in which a label welded by repeated pressure and deformation is not easily separated.

[0007]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing a squeezed container with a label manufactured according to the present invention, and FIG. 2 is a sectional view of the squeezed container of FIG. 1 taken along the line AA.

As shown in FIGS. 1 and 2, the squeezing container with a label is used, for example, as a seasoning container, and has a squeezing body 3 having a substantially elliptical cross section and a squeezing opening. A container main body 1 composed of a portion 2 and a bottom portion 4 and a label 5 made of a substantially rectangular synthetic resin film integrally welded to a substantially central portion of the squeezing body 3 are provided. Both edges of label 5
Reinforcing ridge lines 6 are formed outside both sides 7a, 7b along the side edges 7a, 7b .

In FIG. 3, the split molds 11 are respectively arranged at positions facing each other, and cavities 12 each having a shape of a container are formed on surfaces that contact each other. In addition, on the inner surface of the cavity 12, the side edges 7a, 7b are provided outside the side edges 7a, 7b of the label 5 temporarily fixed.
Are formed along the ridge line forming cavity 16. An extruder head 13 (not shown) is provided above the split mold 11, and a tubular parison 14 obtained by heating and melting a thermoplastic resin is extruded from the head 13 and hangs down. The label 5 is temporarily fixed on the inner surface of the cavity 12 of the split mold 11. The label 5 is sucked by a vacuum hole 15 opened on the surface of the cavity 12 connected to a vacuum source (not shown). As shown in FIG. 5, the label 5 has a base layer 5a and a printed layer 5b formed on one surface thereof, and an adhesive layer 5c formed on the other surface. Cavity 1
The label 5 disposed on the label 2 has the print layer 5b side in contact with the cavity 12 and the adhesive layer 5c side on the outside (Paris side).

Next, as shown in FIG. 4, the split mold 11 is tightened, the parison 14 is sandwiched between the split molds 11, a pressure fluid is introduced into the parison 14, and the parison 14 is expanded. The parison 14 is shaped according to the shape of the cavity 12 of the split mold 11. At this time, the parison 14 adheres to the adhesive layer 5c on the surface of the label 5, and the adhesive layer 5c of the label 5 is melted by the heat of the parison 14, so that the parison 14 and the label 5 are fused together. Then, the parison 14 is cooled to form a labeled squeezed container in the split mold 11. Stop introducing the pressure fluid and split the mold 1
1 is opened and the squeezed container with the label is taken out of the split mold 11.

In the above embodiments, examples of extrusion blow molding have been described. However, known blow molding methods such as rotary blow molding, injection blow molding, and orientation blow molding can be carried out in the present invention.

In the present invention, the thermoplastic resin constituting the container body 1 has an elastic modulus (JISK7113) of 500 to 4000 kg / cm ² , particularly preferably 500 to 3 kg / cm ² .
It is necessary that the thermoplastic resin be in the range of 500 kg / cm ² in order to obtain the squeezing property. Elastic modulus is 5
If it is less than 00, the shape retention property of the container body 1 and the restoring property of the container body 1 are inferior, wrinkles, blisters and dents around the label 5 and the label 5 are generated, and the container body 1 itself is bent and deformed from the label portion. On the other hand, if the elastic modulus exceeds 4000 kg / cm ² , the container body 1 lacks flexibility and does not easily deform under pressure, so that the desired squeezing property cannot be obtained. The most preferred examples are polyolefin resins having an elastic modulus in the range of 500 to 4000 kg / cm ² , especially low density polyethylene, medium density polyethylene, ethylene vinyl acetate copolymer resin, ethylene propylene copolymer resin or ionomer resin.

The container body 1 has a single-layer structure of the above-mentioned thermoplastic resin alone or a blend thereof, or a multilayer structure in which a barrier layer such as an ethylene-vinyl alcohol copolymer resin is formed by laminating these thermoplastic resins as a main layer. Is also good. As described above, the elastic modulus of the container body 1 is 500 to 4000 kg.
/ Cm ² of the thermoplastic resin, the wall thickness of the squeezed body 3 of the container body 1 is generally 200 to 1200.
It is preferable to be in the range of μm in order to obtain the above-mentioned squeezing characteristics.

The synthetic resin constituting the label 5 includes polyolefin resins such as low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene propylene copolymer resin, ethylene vinyl acetate copolymer resin, polyamide resin, and ionomer resin. And a film of a synthetic resin such as ABS resin, polyvinyl chloride and polyethylene terephthalate resin, or a film obtained by blending a filler such as an inorganic material with the synthetic resin, and is preferably a stretched film.

Label 5 is made of low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene,
Ethylene propylene copolymer resin, polyolefin resin such as ethylene vinyl acetate copolymer resin, polyamide resin,
A base layer 5a composed of a film of a synthetic resin such as an ionomer resin, an ABS resin, polyvinyl chloride, or a polyethylene terephthalate resin, or a film obtained by blending a filler such as an inorganic material with the synthetic resin, and preferably a stretched film. And a printing layer 5b in which characters or figures are printed on one surface of the base material layer 5a with an oil-based ink or a solvent type ink, and the surface is clear-coated.
Then, an adhesive layer 5c made of a synthetic resin having a low melting point is formed on the other surface, and embossing is performed, so that the releasability of the labels can be maintained well.

According to the present invention, the label 5 is selected according to the material of the thermoplastic resin constituting the container body 1, and the thickness of the label 5 is preferably 50 to 100 μm in the present invention. If the thickness is less than 50 μm, it will be difficult to separate the superimposed labels one by one, and it will be particularly difficult to arrange the labels in a mold by a label inserter. Conversely, if it exceeds 100 μm, the parison cannot be cooled by the separation mold, the cooling of the parison 14 becomes slow, and the part of the squeezed body 3 to which the label 5 is welded shrinks more than the other parts. Get bigger,
The edge of the label 5 may be raised.

When the label 5 is welded to the container body 1,
The fact that the parison 14 is chemically or physically fixed to the label 5 depending on the melting state of the parison 14. here,
The term "chemically" means that the two are integrated into a material by being compatible with each other and melting. Also, physically refers to a material in which the paris 14 is embedded in and fixed to the surface of the label 5 by solidifying the surface of the label 5. Experimental Example 1 A low-density polyethylene (elastic modulus 1170) was used as a container body.
kg / cm ^2), ethylene-propylene copolymer resin (elastic modulus 3500 kg / cm ²⁾ and polypropylene (using modulus 4800kg / cm ^2), a polypropylene film as a label (modulus 3000 kg / cm ^2, thickness 80 [mu] m) Used, label size is 60mm long, 50 width
mm, the ridge (2 m
mR) was formed, and the squeezed containers a, b, and c having a capacity of 500 cc and having a substantially elliptical body shape as shown in FIG. The squeezed containers a and b with a label are examples, and the squeezed container c with a label is a comparative example. Comparative Example As a comparative example, as shown in FIG. 6 and FIG. 7, a container main body 21 composed of a body 23, a mouth 22, and a bottom 24 that are substantially elliptical and do not form a ridge line, and a body 23.
Squeezed containers d and e having a conventional shape, each of which is made up of the label 25 welded to the container, were molded. Table 1 shows the test results on the appearance and squeezing characteristics of this container.

As is clear from Table 1, the squeezed containers a and b with labels are excellent in appearance, squeezability and resilience.
Excellent within 0 seconds. Further, the pressing deformation and the restoration were repeated 100 times, but no peeling of the label was recognized.

On the other hand, the squeezed container c with label is excellent in resilience, but poor in squeezing characteristics. The squeezed container d with a label bends from the label welding portion of the container body, and the squeezed container e with labels is poor in squeezing characteristics.

[0021]

[Table 1] * Appearance test The deformation of the squeezed container with the label and the wrinkle of the label were visually observed and determined, and the evaluation was made as follows.

Evaluation ◎: Beautiful without deformation and wrinkles.

Evaluation ：: Deformation and wrinkles are slightly observed, but do not hinder practical use.

X: Deformation and wrinkles occurred, and appearance was unsightly. * Squeezing test The squeezing container with the label filled with the contents (mayonnaise) was squeezed in a normal use condition, the squeezability of the contents was determined, and the evaluation was made as follows.

Evaluation A: Squeezing out is easy.

Evaluation ：: Squeezing is normal.

Evaluation X: It is difficult to squeeze out. * Restoration test The squeezed container filled with 30% of the contents (mayonnaise) is placed in an upright state, and the squeezing body is pressed to push up the contents (mayonnaise) to the squeeze port, and then the pressing force is released. The time (seconds) required for the squeezed container to return to its original shape was measured and comprehensively evaluated.

Evaluation ◎: The restoration time is within 5 seconds, and the restoration property is excellent.

Evaluation ：: Restoration time is less than 10 seconds, and restorability is normal.

Evaluation X: Restoring time is 10 seconds or more, and there is no restoring property. Experimental Example 2 A low-density polyethylene having an elastic modulus of 1170 kg / cm ² was used as a container body, and a label having a thickness of 80 μm was used.
The labeled squeezing container a of the embodiment of the present invention using a polypropylene film having an elastic modulus of 3000 kg / cm ² and the labeled squeezing container a except that a low density polyethylene film having an elasticity of 830 kg / cm ² was used. Labeled squeezed container f which is an embodiment under the same conditions
Was molded.

The capacity of both labeled squeeze containers is 500
cc, the body shape is substantially conical and has an average thickness of 800 μm. Table 2 shows test results on the squeezing characteristics and appearance of the squeezed container with a label.

As is clear from Table 2, the squeezed container f with label is excellent in appearance and squeezability, but it took more than 10 seconds to recover.

[0033]

[Table 2] Experimental Example 3 Low-density polyethylene having an elastic modulus of 500 kg / cm ² and elastic moduli of 3500 kg / cm ² and 400 were used as the container body.
The polypropylene 0 kg / cm ^2, and as labels, wall thickness 80 [mu] m, modulus were molded Example a is labeled squeeze container g, h, i of the present invention using a polypropylene film of 4500 kg / cm ² .

As a comparative example, an elastic modulus of 4 was used as the container body.
50 kg / cm ² low density polyethene and elastic modulus 4300
kg / cm ² polypropylene and a wall thickness of comparative examples using the polypropylene film of the elastic modulus 4500 kg / cm ² at 80μm as a label labeled squeeze container j, to form a k.

The capacity of the labeled squeezable container is 40
0cc, squeezed body shape is approximately pyramidal and average thickness 400
μm. Table 3 shows test results on the squeezing characteristics and appearance of the squeezed container with a label.

As apparent from Table 3, the squeezed containers g and h with labels are excellent in appearance and squeezability, and have excellent restoring properties.

On the other hand, the restoration time of the labeled squeezed container i greatly exceeds 10 seconds, and is not suitable as a labeled squeezed container. The labeled squeezed container j is difficult to squeeze and is not suitable as a squeezed container.

[0038]

[Table 3]

[0039]

The present invention is configured as described above.
It has a deformability and resilience suitable for squeezing the contents, and even if the container body is repeatedly deformed when the squeezing body is pressed, the label does not peel and it is stored in a refrigerator etc. and moisture adheres Even if this is done, there is an effect that a squeezed container with a label can be manufactured in which the label does not peel off, wrinkles do not occur on the label, and the shape of the container body does not change.

[Brief description of the drawings]

FIG. 1 is a front view of a labeled squeezed container manufactured using the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view showing a state in which the split mold is opened and the paslin is hung in the steps of one embodiment of the present invention.

FIG. 4 is an explanatory view showing a state after the introduction of a pressure fluid in the steps of one embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a label used in one embodiment of the present invention.

FIG. 6 is a front view of a labeled squeezed container manufactured by a conventional method.

FIG. 7 is an enlarged sectional view taken along line AA of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Squeezing opening 3 Squeezing trunk | drum 4 Bottom 5 Label 6 Ridge line 11 Split mold 12 Cavity 13 Head 14 Paslin 15 Vacuum hole 16 Projection

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroharu Sumikawa 2-12-11 Harajukudai, Goka-mura, Sarushima-gun, Ibaraki Prefecture (56) References JP-A-1-176542 (JP, A) JP-A-3-297620 (JP, A) JP-A-2-188484 (JP, A) JP-A-1-176541 (JP, A) JP-A-62-50117 (JP, A) JP-A-2-178018 (JP, A) JP-A-1-301320 (JP, A) JP-A-2-503406 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 49/00-49/80 B65D 35/00- 35/56

Claims (1)

(57) [Claims] 1. A label is temporarily fixed on an inner surface of a cavity of a split mold that has been opened, a parison made of a thermoplastic resin melted by heating is arranged between the split molds, and then the mold is closed. both side edges of the label in the blow molding process be integrated with the container body to the label during molding by introducing a pressure fluid, which is temporarily fixed to the cavity inner surface
A label having a ridge-forming cavity formed along the both side edges on the outer side thereof, and a thermoplastic resin having an elastic modulus of 500 to 4000 kg / cm ^2. Method of manufacturing a squeezed container.