JPH0717001B2 - How to give a relief pattern to a synthetic resin container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a thin-walled tube, thin-walled bottle, or the like, in which a synthetic resin container filled with cosmetics, daily necessities, chemicals, or the like has a relief pattern such as a picture or letters. Regarding how to attach.

(Prior Art) As a method of giving a pattern to a synthetic resin container, the following methods are known.

As a method of forming fine shallow unevenness for matting on the surface of a synthetic resin container, Japanese Patent Publication No. 51-11657,
A method is described in which an uneven material is pressed from the outside of the container and the inside is received by an elastic material.

As a method for forming a bulge or a recess in the body of a synthetic resin container, Japanese Patent Publication No. 56-20970 describes a method of pressurizing from the inside by blow molding and pressing it against the outer mold wall.

Japanese Patent Publication No. 57-25370 discloses a method of incorporating characters, patterns and the like in a synthetic resin molded product, in which a material is sandwiched between molds and a concave mold is used on one side.

As a method for forming an opal pattern on a synthetic resin molded product, Japanese Patent Publication No. 59-32286 discloses a method of molding a material having a whitening phenomenon between a convex type and a concave type.

As a method of forming a ridge pattern on the trunk,
Japanese Patent No. 34483 describes a method in which a mold is pressed from the outside of the container and a core metal is received from the inside.

(Problems to be Solved by the Invention) However, these conventional methods have the following problems.

According to the above method, fine irregularities can be formed on the surface of the container, but an embossed pattern protruding from the surroundings cannot be formed.

In the above method, the pattern is formed on the container at the same time as the blow, because the method is based on blow molding, and the pattern is not formed as a secondary process after molding the container. Further, with this method, it is not possible to form into a shape aligned with the decoration processing portion such as printing.

The above method is to form a convex portion by molding, and then scrape off the convex portion to form a pattern with a flow trace of the resin, which is used for molding a hard and thick resin molded product. Only can be adapted.

The above method is applied to a molded product that is hard and exhibits a whitening phenomenon when pressed, and is partially pressed by an uneven mold to cause many minute cracks, and unevenness on the container surface hardly occurs.

According to the above method, although a shallow ridge pattern can be formed on the surface of the body of the container, an embossed pattern that obviously protrudes from the surroundings cannot be formed.

It should be noted that the embossed pattern for a highly plastic material that remains as a permanent deformation even when the force is removed, such as a metal panel or paper, can be easily formed by molding using only the concavo-convex mold. It is very difficult to form an embossed pattern on a flexible material by secondary processing because the elastic restoring force of the material causes the shape to collapse in a short time after processing.

However, in order to make a strong appeal to users and increase the added value of the product, it is possible to use a secondary process to form an embossed product into a product that cannot be embossed into a preformed thin-walled tube or thin-walled bottle at the same time. There is a demand for providing a pattern, providing an embossed pattern or the like on a decoration processed portion such as printing or hot stamping, or forming an embossed pattern or the like in a state of being aligned with the decoration processed portion.

(Method for Solving Problems) The present invention has been made for the purpose of solving the problems and satisfying the above-mentioned problems. In order to achieve this object, the present invention provides a synthetic resin container. By placing the relief plate on the inner surface side, pressing the intaglio plate toward the outer surface side of the synthetic resin container toward the relief plate, and pressing for a predetermined time while applying heat to both or one of the plates, the synthetic resin container In the method of applying a relief pattern to the
Keep the distance between the convex side of the letterpress and the concave side of the intaglio at a distance that does not exceed the thickness of the container, and make the distance between the convex top of the letterpress and the bottom of the concave of the intaglio approximately equal to the thickness of the container. The method is characterized by that.

(Operation) In the method of the present invention, as described above, since a preformed synthetic resin container is subjected to secondary processing to form an embossed pattern such as a pattern, the mechanism of the container forming apparatus and No need to change the manufacturing process.

Further, when pressing with both plates, the concave pattern of the intaglio and the convex pattern of the relief plate are faced to each other so that the distance between the convex pattern side surface of the relief plate and the concave pattern side surface of the intaglio plate is kept at a distance not exceeding the thickness of the container.
For the container between the convex side and concave side,
A pinching force acts on the container material that is softened by heating, and the rising part of the embossed pattern is formed by the pinching action accompanied by this heating, and it returns to its original shape over time. The raised pattern is clearly formed.

Further, when pressing with both plates, the distance between the upper surface of the convex pattern of the relief plate and the bottom surface of the concave pattern of the intaglio plate is made approximately equal to the thickness of the container, so that even if a large plate pressing force is applied, the embossed pattern There is no risk of thinning of the top or damage such as punching. In addition, since the method of the present invention is performed as a secondary process, after the primary process, decoration such as printing, painting, or hot stamping can be performed, and the embossed pattern and the like can be aligned and attached. .

Therefore, an embossed pattern having a large amount of embossment and a clear contour can be formed as a secondary process on a synthetic resin container that cannot be formed in a primary process such as molding.

(Example) Hereinafter, the Example of this invention is described based on drawing.

First, in the method of the embodiment, basically, the relief plate 21 is arranged on the inner side surface of the plastic tube container 1 (hereinafter abbreviated as the tube container 1), and the relief plate 21 is arranged on the outer surface side of the tube container 1 toward the relief plate 21. By pressing 22 so that the concavo-convex patterns 24 and 23 face each other (Fig. 1), and pressing for a predetermined time while applying heat to both or one of the plates 21 and 22 (Fig. 2),
Embossed pattern 3 on the barrel 2 of the tube container 1 by secondary processing
The mold (having the rising portion 3a and the top portion 3b) is molded (FIG. 3).

The structures of the relief printing plate 21 and the intaglio printing plate 22 used in the method of this embodiment will be described.

As shown in FIG. 4, the relief plate 21 is formed with a convex pattern 23 (having convex pattern side surfaces 23a and convex pattern upper surface 23b) in which the surface of the plate material is convex. H is concave 24
Is higher than the depth (Fig. 5), and thermosetting resin is used as the material.

As shown in FIG. 6, the intaglio plate 22 has a concave pattern 24 on the surface of the plate material.
(The concave pattern side surface 24a and the concave pattern bottom surface 24b) are engraved, and the engraved width of the concave pattern 24 is wider than the width of the convex pattern 23 corresponding to that position, and when both patterns 23, 24 are combined. The plate interval t _{1 of} is approximately equal to the thickness dimension of the body 2,
The t ₂ is formed to have a dimension of 4/5 of the thickness of the body 2, and brass is used as the material.

The configuration of the type machine 6 used in the above-described embodiment method will be described.

As shown in FIG. 7, the mold machine 6 is provided with a power unit 7 on the upper side, and a heating plate 12 is connected below the shaft unit 14 for transmitting the motion of the power unit 7.

Then, below the heating plate 12, a mounting plate for fixing the intaglio 22.
A heater 13 for heating the intaglio 22 and a power supply interrupting sensor for adjusting the intaglio 22 within a certain temperature range are incorporated in the heating plate 12.

The power unit 7 operates the hot platen 12 and the like within a certain vertical range via the shaft unit 14.

A table 11 is provided at a height position in the middle of the molding machine 6 (below the power section 7), and a table 11 having a semicircular cross section which can be inserted into the tube container 1 is provided at substantially the center of the table 11. Mandrel 17 is bolted through mandrel base 18
It is connected and fixed to the upper end of 15, and the letterpress is on the upper surface of the mandrel 17.
21 is fixed.

If you turn the height adjuster 16 clockwise, the mandrel base
18 moves up, and the letterpress 21 approaches the intaglio 22 accordingly.

The letterpress plate 21 and the intaglio plate 22 are attached and fixed so that the concavo-convex patterns 24 and 23 face each other and that the plate interval t ₂ is positioned in a well-balanced manner on the left and right sides.

Below the table 11 is a bolt 15 and a mandrel base 18
The letterpress plate 21 is raised up close to the intaglio plate 22 via
When pressed by 1, 22, the convex pattern upper surface 23b of the relief plate 21 and the intaglio 22
The plate interval t ₁ with the bottom surface 24b of the concave pattern is approximately equal to the thickness of the tube container 1, or when both pattern side surfaces 23a, 24a are formed in a tapered shape, the plate interval t ₂ is the body part 2 of the tube container 1.
A height adjuster 16 is provided to adjust the thickness to 4/5. Incidentally, instead of the function of appropriately raising the relief plate 21 by the height adjuster 16, the power unit 7 connecting the heating plate 12 and the like is appropriately lowered to the relief plate 21 side, and the plate spacing t ₁ between the relief plate 21 and the intaglio plate 22 is changed. , t ₂ may be adjusted.

At the left and right positions of the table 11, the height adjusting portion 16 when pressed
Adjust the plate spacing T ₁ or both sides 23a, 24
When a is formed in a tapered shape, a head stopper 19 for maintaining t ₂ at a constant interval from the start of pressing to the end of pressing 19
Is provided, and a stopper plate 20 is provided above the stopper 19 via a height adjusting screw portion 20a.

By the height adjustment by the stopper plate 20, the convex pattern top surface 23b of the relief plate 21 and the concave pattern bottom surface 24b of the intaglio plate 22 are pressed at the time of pressing.
When the plate spacing t ₁ is substantially equal to the thickness of the body 2 of the tube container 1 and the pattern side surfaces 23a, 24a are formed in a tapered shape, the plate spacing t ₂ is also the thickness of the body 2 of the tube container 1. Regulate to maintain 4/5.

Further, in front of the table 11, a temperature controller 8, an embossing time controller 9, and a start button 10 are attached, and the temperature controller 8 is connected to a heater and a sensor incorporated in a heating plate 12. In addition, the embossing time controller 9 has a function of freely adjusting the temperature of the intaglio 22 and a function of freely adjusting the descending time of the intaglio 22 in conjunction with the power unit 7. further,
On the back side of the power unit 7, the intaglio 22 descends and a pressure regulator that can freely adjust the pressure on the relief plate 21 is attached.

Next, the operation will be described.

(A) Preparatory work on the die-making machine 6 Relief plate 21 on mandrel 17 and intaglio plate 22 on mounting plate 13
The patterns 23 and 24 of 21 and 22 are faced to each other, and the plate interval t ₂ is left and right and front and rear so as to maintain 4/5 of the thickness of the body portion 2 of the tube container 1 in a well-balanced manner. When the mounting plate 13 of the intaglio plate 22 is lowered and brought into contact with the stopper plate 20, the intaglio plate 22 is horizontal and accurately stops so as not to further descend from the set position.

This is to prevent the descending position of the intaglio 22 from changing during the pressing by the relief plate 21 and the intaglio plate 22 from the start to the end of the press, so that the operating range remains in the power unit 7 such as an air cylinder. However, the lowering of the intaglio 22 is restricted.

When pressing a flexible material such as a thermoplastic resin having a low softening point with a heated plate, when the heated plate comes into contact with the material, the material softens due to heat conduction and the mounting plate 13 is almost at the same time when the material is in the desired raised state. Abut the stopper plate 20 and intaglio
22 descent stops completely.

If the stopper plate 20 is not provided, the pressure from the power unit 7 continues to be transmitted even after the material is softened, so that the intaglio 22 is gradually lowered and is formed by the convex pattern upper surface 23b of the convex plate 21 and the concave pattern bottom 22b of the intaglio 22. The plate interval t ₁ gradually decreases, and therefore the top thickness of the embossed part becomes thinner,
May cause damage such as punching.

In order to solve this problem, in the present invention, the head stopper
19 is arranged and the mounting plate 13 of the intaglio plate 22 is brought into contact with the stopper plate 20 so that the intaglio plate 22 does not descend after the body portion 2 of the tube container 1 is in a state of being embossed and patterned.
That is, it controls the lowering stop position of the intaglio 22 when the pressing is completed.

The distance between the intaglio plate 22 and the relief plate 21 is adjusted so that the height adjustment section 16 is rotated and the bolt 15 is raised to the appropriate stop position with respect to the descent stop position of the relief plate 22.

This is because when pressing by the relief plate 21 and the intaglio plate 22, the plate interval t ₁ between the convex pattern top surface 23b of the relief plate 21 and the concave pattern bottom surface 24b of the intaglio plate 22 is set to be approximately equal to the thickness of the body portion 2 of the tube container 1. And when the pattern side surfaces 23a, 24a are formed in a tapered shape,
This is because when the plates 21 and 22 are pressed, the plate distance t ₂ between the convex side surface 23a of the relief plate 21 and the concave side surface 24a of the intaglio 22 is adjusted to 4/5 of the thickness of the body portion 2 of the tube container 1. .

The temperature controller 8 sets the temperature according to the material and thickness of the tube container 1.

For example, when the intaglio 22 is made of brass and the body 2 is made of low-density polyethylene having a thickness of 0.5 mm, the temperature is 100 to 150 ° C.

The operating pressure of the power unit 7 is set to the material of the tube container 1 and the intaglio plate.
Adjust the conditions suitable for the depth of the concave pattern 24 of 22.

For example, with the low density polyethylene, the pressure applied to the processed part is 10 to 25 kg / cm ² .

The embossing time controller 9 sets the pressing time of the intaglio 22 according to the material of the tube container 1 and by taking the temperature and pressure into consideration.

It should be noted that the temperature, pressure, and pressing time are mutually related, and are good such as "set temperature to low and increase pressure" or "increase pressure to reduce pressing time and increase production efficiency". The method for obtaining the embossed pattern 3 can be performed by combining several conditions.

In other words, the optimum conditions are set by appropriately finding the conditions according to the type of material, the degree of embossing, the shape of the embossing pattern, and the like.

(B) At the time of processing the embossed pattern The case where the embossed pattern 3 is machined on the body portion 2 of the tube container 1 by the die-equipped machine 6 which has been prepared is described below.

First, the mandrel 17 is mounted so as to cover the tube container 1, and the portion of the body 2 to be machined is aligned with the relief plate 21.

After that, when the start button 10 is pressed, the intaglio 22 is pushed down for the time indicated by the time adjuster 9, the body 2 is sandwiched between the intaglio 22 and the letterpress 21 (FIG. 1), and the intaglio of the intaglio 22 is depressed. Pattern side 24
It is narrowed down by the convex pattern side surface 23a and the convex pattern upper surface 23b of the relief plate 21 so as to fit a and the concave pattern bottom surface 24b (FIG. 2), and the embossed pattern 3 having substantially the same height as the depth of the intaglio plate 22 is thermoformed. (Fig. 3).

At this time, after the desired embossed pattern 3 is reached, the intaglio 22 is not lowered by the stopper plate 20. Therefore, the embossed state is stable and even if repeated work is performed,
Since the plate intervals t ₁ and t ₂ between the concave pattern bottom surface 24b and the convex pattern upper surface 23b and between the concave pattern side surface 24a and the convex pattern side surface 23a do not change, the embossed pattern 3 of the same quality is continuously applied to the body portion 2 of the tube container 1. Can be processed.

As described above, in the method of providing the embossed pattern 3 on the tube container 1 of the embodiment, the following effects can be obtained.

Since this is a method of performing patterning on the preformed tube container 1 by secondary processing, there is no need to change the mechanism of the forming device of the tube container 1 or the manufacturing process.

As a result, all of the tube containers 1 or only the tube containers 1 that need patterning can be patterned by secondary processing simply by adding the molding machine 6 to the existing tube manufacturing line.

Also, since the patterning can be done by the secondary processing, it can be applied even when the patterning cannot be done at the same time when molding the extruded tube container, etc., and the decoration processing such as printing, painting and hot stamping is applied in the previous process, Since it can be patterned in a state of being aligned with the parts, it is possible to enhance the appeal to users or the added value of products.

When pressed by both plates 21 and 22, the convex side surface 23a of the relief plate 21
The plate spacing between the concave side surface 24a of the intaglio 22 and the tube container 1
Since the plate spacing t ₂ is set so as not to exceed the thickness of the tube container 1, the portion of the tube container 1 sandwiched between the convex side surface 23a and the concave side surface 24a is made of the material of the tube container 1 which is softened by heating. A pinching force acts, and by this pinching action accompanied by heating, the rising portion 3a of the embossed pattern 3 is formed, and it does not return to its original shape with the passage of time, and is formed clearly. It

When pressed by both plates 21 and 22, the convex upper surface 23b of the relief plate 21
Since the plate spacing t ₁ between the intaglio 22 and the bottom surface 24b of the intaglio pattern 22 is made substantially equal to the thickness of the tube container 1, even if a large plate pressing force is applied, the thickness of the top 3b of the embossed pattern 3 is There is no danger of thinning or damage such as punching.

As a result, the rising portion 3a of the clear embossed pattern 3
You can apply the necessary and sufficient clamping pressure to obtain
Further, the function of protecting the contents is not impaired, and the plates are not damaged due to contact between the plates.

Although the embodiment has been described above with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within a range not departing from the gist of the invention, the invention is included in the invention. .

For example, the container to which the method of the present invention is applied includes the containers described below.

Extruded tube container The body part that processes the embossed pattern is formed by extrusion molding,
Cut the extruded pipe to the desired length, glue the head molded by injection molding to one end, and then print, paint or hot stamp the outer surface of the body, and then emboss it. It is a container.

As the material of the body, a single layer structure of a thermoplastic resin having a relatively low softening point such as polyethylene, polypropylene, or polybutadiene, and a thermoplastic resin having a low softening point thereof are arranged in the inner and outer layers, and the intermediate layer is formed. A barrier resin such as a saponified ethylene-vinyl acetate copolymer or nylon is placed in.

Lamination tube container The structure of the body is the same as in the case of extruded tubes, using a thermoplastic resin with a low comparative softening point, such as polyethylene or polypropylene, as the inner and outer layers, and a metal foil such as aluminum or the barrier properties mentioned above between these layers. After arranging a resin and firmly adhering each layer with an adhesive, an embossed pattern is processed in a flat plate state. Then, it cut | disconnects in a predetermined blank, a side seam adhesion process is performed, and a trunk | drum is manufactured.

Alternatively, the side seam bonding process may be performed to form a cylindrical shape, and then the embossed pattern may be processed. In addition, the bonding process of the head is the same as in the case of the extruded tube.

Most of the extruded tube container and the laminated tube container of (1) are used together with the embossed pattern of the present invention and the decoration processing such as printing, painting and hot stamping.

Blow-molded container The material is a single layer of a thermoplastic resin having a relatively low softening point as in the case of an extruded tube, and a gas barrier resin disposed between these thermoplastic resins.

Since the thickness of the body of the blow-molded container is thicker than the thickness of the extruded tube, the blow-molded container has a function of protecting the contents, and therefore the outer surface may be subjected to embossing without painting.

Of course, like the extruded tube, the embossing process may be performed after printing, painting, hot stamping, or the like.

Further, as the plate material, thermosetting resin and brass are shown, but metal such as iron, copper, and aluminum produced by hand engraving method or corrosion method, or heat resistant rubber may be used. Further, the plate base made of metal may be coated with a fluorine resin or the like, and the method of heating the plate is not limited to the intaglio plate 22, but a mandrel heater or the like may be embedded to heat the relief plate 21. It is also possible to heat both of them to shorten the pressing time and improve the productivity.

Further, in the example, the example in which the embossing process is directly performed on the body part of the container is shown.However, a thermosetting resin or the like is applied to the embossing process part before the embossing process so that the pattern surface of the plate can be easily released. Workability can also be improved.

The position where the head stopper is provided is not limited to the left and right.

When the head stopper is not provided under the same processing conditions as the case where the head stopper is provided and the body part of the plastic container is provided with an embossed pattern, the embossed height becomes about 30% lower in the body part made of low-density polyethylene, The pressure on the top of the embossed pattern changed slightly. In order to avoid this situation, the pressing time was shortened, the pressure was reduced, and the temperature was decreased. However, during continuous machining, the embossed state varied, resulting in insufficient embossment and local deformation of the machined part.

In the embodiment, the plate interval t _{2 is set} to the thickness of the body ₂ of the tube 1.
Although an example of adjusting to 4/5 has been shown, this plate interval t ₂ is appropriately set to an optimum interval depending on the size of the container, the material, the embossed pattern, etc., and can be 4/5 or less or 4/5 or more. good.

(Effects of the Invention) As described above, in the method of giving the embossed pattern to the synthetic resin tube container 1 of the present invention, the relief plate is arranged on the inner surface side of the synthetic resin container, and facing the relief plate. The intaglio plate is pressed against the outer surface side of the synthetic resin container so that the concavo-convex pattern faces, and both or one of the plates 21 and 22 is pressed for a predetermined time while applying heat to the synthetic resin container.
In the method of applying an embossed pattern in the next process, when pressing with the both plates, while maintaining the distance between the convex pattern side surface of the relief plate and the concave pattern side surface of the intaglio plate at a distance not exceeding the thickness of the container, and with the convex pattern top surface of the relief plate. Since the distance between the bottom surface of the intaglio and the bottom surface of the intaglio is set to be approximately equal to the thickness of the container, the pre-molded synthetic resin container has a large amount of protrusion and a contour that is secondarily processed. The effect that a clear embossed pattern can be attached can be obtained.

In addition, since the embossed pattern is formed by the secondary processing, it can be applied to the container of the molding method in which the embossed pattern cannot be simultaneously formed at the time of the molding in the primary processing, and the decoration part for printing, painting, hot stamping, etc. Since it can be patterned in the state of being aligned with, it can increase the added value of the container, appeal strongly to the user and increase the willingness to purchase the product.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a relief pattern is applied to a plastic tube container, FIG. 2 is an enlarged cross-sectional view taken along the line II of FIG. 1, and FIG. 3 is a plastic tube container having a relief pattern. 4 is a perspective view showing a relief plate used in the method of the embodiment, FIG. 5 is a cross-sectional view showing a state where the relief plate and the intaglio plate are combined, and FIG. 6 is an intaglio plate used in the method of the embodiment. FIG. 7 is a perspective view showing the structure of a mold machine used in the method of the embodiment. 1 …… Plastic tube container 2 …… Body 3 …… Embossed pattern 21 …… Convex plate 22 …… Intaglio 23 …… Convex pattern 23a …… Convex side 23b …… Convex pattern Top 24 …… Concave pattern 24a …… Concave Pattern side 24b …… Concave pattern bottom t ₁ , t ₂ …… Plate spacing

Claims (1)

[Claims] 1. A relief plate is arranged on the inner surface side of a synthetic resin container,
In a method of pressing an intaglio plate on the outer surface side of a synthetic resin container toward the relief plate, and applying an embossing pattern to the synthetic resin container by pressing for a predetermined time while applying heat to both or one of the plates, While pressing the both plates, the distance between the convex pattern side surface of the relief plate and the concave pattern side surface of the intaglio plate is kept at a distance not exceeding the thickness of the container, and the distance between the convex pattern upper surface of the relief plate and the concave pattern bottom surface of the intaglio plate is larger than the container. A method for applying a relief pattern to a synthetic resin container, which is characterized in that the thickness of the container is approximately equal to the thickness.