JPH01209128A - Method of manufacturing and decorating plastic vessel with neck section - Google Patents

Abstract

PURPOSE: To simplify manufacture by molding the main body of a container alone or along with a neck part without forming a bottom part or along with the bottom part without forming the neck part by a thermoplastic injection method and applying decorative marking to the main body inserted on a mandrel. CONSTITUTION: The cylindrical main body 5, bottom part 6 and neck part 7 of a bin are molded by a thermoplastic injection method. Next, the main body 5 is inserted on a mandrel 8 to perform marking. By this constitution, the main body can be perfectly supported on the bracket cylinder 9 of a stamping machine. After this marking work, the bottom part 6 and the neck part 7 are combined with the main body 5 by adhesion, welding or clamping.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing and decorating a plastic container with a neck.

Using injection blow molding method or extrusion blow molding method,
Methods are already known for implementing containers of this type, for example cosmetic bottles or pharmaceutical bottles. For example, in extrusion blow molding, a parison that emerges vertically from an extruder is directed into a two-part mold and expanded within the mold by blow molding. The neck thus formed in the mold is then cut off and the two parts are opened, allowing the finished bottle to fall into a receiving trough or onto an outgoing conveyor.

Figure 1 of the accompanying drawings schematically shows a sketch of a bottle 1 of this known strain. This bottle contains the so-called “
It has a continuous rib 2 created by the dividing edge of the two parts of the mold called the "joint surface". When engraving decorative motif 3, this motif 3 is attached to the joint surface 2.
If it straddles the line, it will look like an external defect.

In order to avoid this, a method is adopted in which a reference point 4 is provided at the top of the bottle. This reference point serves to mount the bottle 1 in the stamping machine in such a way that the stamp does not straddle the joint surface 2. Next, it is also necessary to verify the finished product. These requirements have the inconvenience of complicating both the marking device and the marking method.

In addition, this type of bottle has low rigidity, and unless high-pressure air is pumped into the bottle during the stamping process, it will deform due to the action of the stamping roller or blanket.

Again, using such high pressures leads to complex pressures on the marking device.

Finally, another inconvenience associated with this practice of injection blow molding or extrusion blow molding is the problem of inconsistent thickness of the resulting bottles.

The present invention aims to eliminate these inconveniences. The invention therefore relates to a method of manufacturing and decorating a plastic container with a neck. According to the method of the invention, the container can be made of thermoplastic material in any shape, including a body only, that is, no neck or bottom, a neck and no bottom, or a bottom and no neck. Manufactured by an injection method, the body of the container is then inserted 2 onto a mandrel and the decoration is engraved. Subsequently, a separately produced neck and/or bottom can be fixed onto the decorated body, or if the body is carried out in necked form in one injection operation. As with conventional soft tubes, the lower part of the body is closed by welding after the bottom parts are pinched together.

The invention will be better understood and its advantages and other features will become apparent from the following description of two exemplary embodiments with reference to the accompanying schematic drawings, in which: FIG.

However, these examples do not limit the scope of the present invention.

Referring to FIG. 2, the cylindrical body 5 of the bottle, its base 6 and its neck 7 are first made by the rC1 thermoplastic injection process. Due to the injection method, the thicknesses of these three elements are very constant and there are no joint surfaces. As a variant, only the main body 5 can be made by an injection method, and the other two elements 6 and 7 can be made in a completely different way.

Next, as shown in FIG. 3, one mandrel 8 and the upper body 5 are inserted to perform marking. This allows the main body to be completely supported on the blanket cylinder 9 of the stamping machine. This method of marking a hollow, hollow rotating body with parallel generatrix lines by inserting the body onto a mandrel is a known technique per se.

After this stamping work, the bottom part 6 and the neck part 7 are glued and
It is combined with the main body 5 by welding or tightening. As a variant, if the three elements 5 to 7 are finally made with thread grooves, they can also be combined by screwing.

3-5, according to the invention, the container or tube with its bottoms pinched together is first formed into a cylindrical body 1, also by thermoplastic injection method.
It is created by creating 0 (Figure 4). ta"L
, the bottom (or base) 11 of this body is completely open, and its top 12 (corresponding to the neck 7 of the one previously shown) can be closed by a soft stopper tongue 14. It looks like this. The tongue 14 is flexible so that it can conform to and merge with the upper part 12. Of course, this tongue 14 is produced in the same process as the injection of the main body 10.

The body 10 is then inserted over the protruding mandrel and
The marking is carried out as already explained with reference to FIG.

When this marking operation is performed, the tongue 14 is used to close the orifice 13 and the tube 10 is filled from the open bottom 11. Subsequently, the bottom 15 of the tube is closed by pinching or welding in a manner similar to that conventionally done with soft tubes.

It will be clear that the invention is not limited to the embodiments described above. Plastic containers can take other shapes (half-moon, nine frusto-conical, etc.).

Polygon, -1-). Even when limited to bottles, first a combination of the main body 5 and the neck part 7 or a combination of the main body 5 and the bottom part 6 is made, and then, after stamping, these combined parts are also produced using the injection method. or other elements made in a completely different way,
That is, it can also be made in combination with the bottom part 6 or the neck part 7.

Another advantage of the method according to the invention is that the various elements to be assembled, for example elements 5.6.7, can be made by injection method using plastic materials of different colors, and the resulting bottles can be manufactured using methods known to date. The point is that it can provide an aesthetic value that is different from that of bottles obtained in the traditional way.

The present invention can be applied to all types of containers, regardless of whether they are rotating bodies or not. For example, it may be a parallelepiped with a square, rectangular, or triangular cross section.

Also, the different elements 5°6.7 to be combined may be made of different plastic materials.

The same container may have multiple necks of the same or different shapes. The main body 5 may have a plurality of partitions in the horizontal or vertical direction. The neck or necks may be provided with an integral, unseparable stopper of simple or complex shape, and may also be provided with an integral metering pump. It is also possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional bottle. FIG. 2 is a longitudinal sectional view of a bottle before stamping and assembly carried out by the method according to the invention. FIG. 3 is a very simplified view of the decoration engraving process on the bottle. FIG. 4 is a longitudinal cross-sectional view of a tube of another shape carried out by the method according to the invention before stamping, filling and closing; Figure 5 shows engraving and filling from the bottom of Figure 4. and FIG. 6 shows the same tube after closure. FIG. 6 is a view seen from the direction f in FIG. 5. 5.10...Cylindrical body, 7.12...Neck part. 6... Bottom, 8... Mandrel, 11... Bottom. 13... Orifice, 14... Tongue. U) b- M Tsuhe procedure Nei city official letter (voluntary) July 5, 1986

Claims (1)

[Claims] 1. A method for manufacturing and decorating a plastic container with a neck (7, 12), in which the body (5, 10) of the container is attached to the neck (7, 10) alone or without a bottom (6). 12)
with the bottom (6) or without the neck;
A method characterized in that it is molded by a thermoplastic injection method and that the decorative imprinting is carried out with the help of a body (5, 10) inserted onto a mandrel (8). 2. A method according to claim 1, in which the decorated body (5) is then provided with a separately implemented neck part (7).
and/or fixing the bottom (6). 3. Method according to claim 2, characterized in that the fixing of the neck (7) and/or the bottom (6) is carried out by gluing or welding. 4. Method according to claim 2, characterized in that the fixing of the neck (7) and/or the bottom (6) is carried out by screwing. 5. In the method according to any one of claims 2 to 4, the neck part (7) and/or the bottom part (6) fixed to the body after engraving are made of plastic having a color different from that of the body (5). A method characterized in that the method is formed of a material. 6. The method according to any one of claims 2 to 5, wherein the neck (7) and/or the bottom (6) each
A method characterized in that it is carried out in a unique plastic material different from that which constitutes the body (5). 7. A method according to claim 1, in which the bottom (11) is open and the top (12) is opened in a single injection operation to produce a container with a pinched bottom (15). is closed, but an orifice (1) is integral with the upper part (12) and can be plugged by a soft tongue (14) for the stopper carried out in the course of the injection operation.
3) forming a body (10) with said stamping and filling the body (10) from said open bottom (11) while closing the orifice (13) with the tongue (14); A method characterized in that the bottom of the main body is then closed by sandwiching them together and welding.