DE1234361B - Method and device for the production of plastic coatings on glass objects, in particular glass bottles - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

C 03 c

German class: 32 b - 17/32

Number: 1234 361

File number: S 65070 VI b / 32 b

Filing date: September 23, 1959

Opened on: February 16, 1967

The invention relates primarily to a method for producing plastic coatings on glass objects, in particular glass bottles, in which the guided along a self-contained path Objects first heated to a predetermined temperature, then immersed in a plastic bath and after removal from the bath at a temperature above the preheating temperature Temperature are treated, but in the second place also a device for exercising such Procedure.

Plastic coatings produced in this way protect, on the one hand, the glass object, in particular Glass bottles against impact loads, but also against those who use the object against splinters occurring when the object breaks, especially when the filling of the Item is under pressure.

A known, leading to such advantageous glass objects, in particular glass bottles, above The basic principles of the method are carried out in such a way that the object is brought to a preheating temperature of 80 to 100 ° C. After the subject has been brought into the plastic bath and taken out again, it must be allowed to drain, which can be achieved if necessary by the action of an electrostatic field. The subsequent Treatment of the object at a temperature above the preheating temperature serves to solidify the coating. In a known method, the temperature is 180 to 200 ° C and takes a relatively long time to act on the object, namely about 10 minutes brought. It is this post-treatment time that is part of the individual steps of the procedure takes the longest and therefore determines the possible throughput rates.

The technical object of the invention consists in specifying how to shorten the post-treatment time and thus an increase in throughput can be made possible.

According to the invention, this object is achieved in that the objects are heated to a preheating temperature be brought, which is so high that the objects after taking them out the bath and after the plastic coating has solidified still have a temperature that is higher is than that of the bath, and the solidification of the solidified coating at a temperature of 350 to 400 ° C is made.

As part of this process, the glass

Method and device for manufacturing
of plastic coatings on glass objects,
in particular glass bottles

Applicant:

Compagnie de Saint Gobain, Neuilly-sur-Seine

(France)

Representative:

Dipl.-Ing. R. H. Bahr and Dipl.-Phys. E. Betzier, patent attorneys, Herne, Freiligrathstr. 19th

Named as inventor:

M. Claude Louis Duperriez,

Sucy-en-Brie, Seine-et-Oise (France)

Claimed priority:

France of September 26, 1958 (775 346) - -

*

objects as a result of their considerably increased preheating temperatures with correspondingly higher temperatures the plastic bath and therefore bring the heat required to solidify the coating for the layers of the coating adjacent to the glass.

The correspondingly reduced time for the entire coating to cure enables it to be used a significantly increased post-treatment temperature compared to the known process, which, however not, as is to be feared, overheating and thus destruction of the coating from the outside leads here.

With the invention, a considerable reduction in the post-treatment time can actually be achieved has to be less than 2 minutes.

The applied within the scope of the method according to the invention, considerably beyond the known preheating temperatures, which are between 130 and 180 ° C. in a preferred embodiment of the invention can, but can also be advantageous in other respects.

Such advantages arise essentially from the fact that in the method according to the invention the treated object in the bath and after the bath has a higher heat potential than the bath itself

709 509/198

3 4

possesses, while in the known method the dipping method according to the invention er-heat potential of the treated object on as possible it also drops with a container of very clothes of the bath. This difference in dimensions makes do, which means that the method according to the invention initially has the effect that only a small thickness of the amount of plastic deposited on the treated object is lost at the end of the production process,
layer is a function of the immersion time. As a result of the vertical lifting of the objects, the coagulation process of the still liquid outer - if this the shape of containers with a layer of the coating can already be effected, an opening surrounded by a ring, for example, depending on when the workpiece leaves the bath, which means that they have a bottle, from the bath, the residual need for draining is formed by electro-drops in the center of the floor, where it does not affect the static treatment or the induction of the co- used with certain known stability of the bottle placed on its base. It is therefore not necessary to apply any special device to agulation by the action of infrared rays in order to avoid it on the outer layer. to remove.

A consequence of the grand scheme worked out above. It has also been found to be advantageous that

Another difference is the fact that the speed at which the vertical direction

in the method according to the invention, the influence of lifting the bottle out of the bath takes place after the

the thickness of the vitreous to the thickness of the over- relationship

is switched off. As a result, a V = K sin ² <x
significantly more constant coating thickness can be obtained

the. In particular, jumps of the factory are set, where V covers the vertical nozzle better. The reduction in overspeed, K is a constant dependent on the viscosity of the tensile thickness in the re-entrant areas, of the plastic material and, as can be seen, only about 25% instead of 50 to 60% α is the angle at which the tangent at each of the known procedures. In addition to the time zone to be achieved by the 25 point of the profile of the object with the method according to the Horierfmdungsgemeinschaft forms.

According to a further feature of the invention, there is also an even better result

the coating itself. If the bath is placed under electrostatic voltage

The method according to the invention is continued. In this way it is possible to achieve a better difference to known methods of the plastic along the objects, also moderately with regard to the process of immersing the liquid object in the bath so that the thickness of the liquid object is changed so that this film is reduced and the course the coagulation process is enhanced with a minimum of agitation of the outer layer process.
Object can run off in the bathroom. Below is a procedure for carrying out the above

In an embodiment that has been modified in this respect, the method of the method according to the invention, which is basically described, is used for this purpose, for example apparatus, so that the objects in the bath are described in a vertical drawing. It shows
immersed and in the same way this verti- F i g. 1 a schematic overall view of the fore quay taken, possibly in an additional direction,

oscillating movement with respect to the bath liquid 4 ° F i g. 2 in a detailed view of a device for offset will. In this respect, the invention is still capable of end-of-life removal of the bottles from which they are transported loose chains with regard to the concrete shape,

of the container to be treated, namely when F i g. 3 schematically a device for a container with an opening of the bottles surrounded by a ring.

tion are treated, including, for example, Fl. 45 According to FIGS. Bottles 1 are seated on 1 and 2

see fall. In this case, the invention proposes pigtails 2 on rods 3 with both ends

before that, in the final phase of immersion, the art is linked to endless chains 4. The bars 3

Fabric cover at the point of the ring through a ver are in a manner not shown so that the

vertical movement of low amplitude of the counter-peg pin 2 its position shown in FIG. 2 constantly

which is amplified in the bathroom. The advantage that 50 retained.

results in that the object or the bottle F i g. FIG. 2 only illustrates that according to FIG minimal movement compared to the Bad th embodiment device used executes, consists in a conceivably uniform for gripping the objects, in execution distribution of the plastic material on all surfaces for example bottles serving gripper organs. Two of the object, while in contrast to this at 55 levers with two hinged on an axis 7 each the known method, the movement of the opposing arms 8 and 9 sit on each pin 2. The Standes, in particular a bottle in the bath an arms 8 are symmetrical to the axis 7 on the asymmetrical convection flow and thus one two sides of this axis horizontal, the other uneven distribution of the plastic layer er arms 9 vertically. The arms 9 have extensions 10 gives. 60 each pin 2 is threaded a disk 11, the

Furthermore, the implementation of the immersion pre- makes by a spring 5 against the arms 8 of the two

Ganges, as it is pressed in the method according to the invention lever and such the two approaches

application takes place, a rotation of the object or the 10 holds in their spaced apart position. It

Bottle in the bath, as in known methods, only needs the bottle neck on the

for the purpose of better distribution of the plastic layer, beak-like extensions 10 are attached and the

must follow, superfluous. This results in a bottle being pushed down to serve

Simplification of the apparatus and a larger gesture that the approaches approach each other first in this one

accuracy of the immersion height. Able to pass the bottleneck, then turn back

away from each other and then hold the bottle on the other side of the neck, attacking the inside of the bottle. The bottle is released by the fact that the profile body 12, which is movable on a vertical direction Rod 13 are attached, are moved downwards and in the lower position of the rod 13 on the arms 8 of the lever act, pushing them down against the action of the spring 5 and thereby bring about the approach of the lugs 10, which can pass the bottle neck in this way.

The chains move forward intermittently.

The bottles placed at A are in the z. B. introduced by burner 15 heated preheating ovens 14 and transported above the immersion tank, where they come to a standstill because this position corresponds to a standstill position of the chains. In this position, the square rod 3, which carries the mute ^ carrying a bottle, is released from its guide so that it can turn. However, it is held in place as soon as it comes to rest on the upper edge 16 of a plate 17 which forms a lever and which has a vertical slot 18 in which a pin 19 firmly connected to the immersion tank 20 engages. The container 20 is provided with a pipe socket 21 through which the liquid plastic compound is supplied, and also has an overflow 22 via which the excess liquid flows back to the feed container.

By means of a cam system, not shown, the container is only moved slightly in the transverse direction in the direction of arrow D and thereby brought the bottle into the inclined position by means of the pin 19 and the lever plate 17, which causes the rotation of the square rod.

The container now rises in the direction of arrow F , the bath comes into contact with the bottle, and the coating process begins. Because the bottle is inclined, no air bubble can form under the floor.

The container, which continues to rise, then moves in the direction of arrow E until the bottle is upright again. At the end of the immersion process, as explained above, the container is set in a vertical oscillating movement of low amplitude. When the coating process is finished, the container moves downwards in the direction of arrow F ₁ and returns to its starting position.

These movements are controlled by a cam with an appropriate profile. As above has already been stated, it is useful that the immersion speed is the square of the sine of the Angle which the bottle profile forms to the horizontal is. The profile is accordingly of the cam formed.

In the case of essentially cylindrical bottles, this area can have a constant Speed up, d. that is, the profile of the cam is constant in the corresponding area.

As already explained above, it is advantageous if the container is subject to a high electrostatic There is tension.

The bottles coated in this way are shown schematically at 23 by the chains 4 in FIG Introduced kiln and after leaving it cooled by fresh air flowing out of the nozzles 24. As soon as the bottles reach the point i? have achieved, they are through the action of the profile body on the lever arms 8 in the approaches of the lever arms 9 approaching each other, as above described, released, and the cycle begins again.

Claims (10)

Patent claims: 1. Process for the production of plastic coatings on glass objects, in particular Glass bottles, in which the objects guided along a self-contained path initially heated to a predetermined temperature, then immersed in a plastic bath and after removal from the bath at a temperature above the preheating temperature Temperature treated, characterized in that the objects on a Preheating temperature are brought, which is so high that the objects after Remove from the bath and, after the plastic coating has solidified, another temperature have, which is higher than that of the bath, and the solidification of the solidified coating is carried out at a temperature of 350 to 400 ° C. 2. The method of claim 1 using polyvinyl chloride as the plastic coating, characterized in that the articles to temperatures of 130 to 180 ⁰ C are preheated. 3. The method according to claims 1 and / or 2, characterized in that the objects immersed vertically in the bath and withdrawn from it in the same way, if necessary set in an additional oscillating movement in relation to the bath liquid will. 4. The method according to claim 3, characterized in that the removal speed the formula corresponds, where V is the vertical removal speed, K is a constant dependent on the viscosity of the plastic material and α is the angle which the tangent forms with the horizontal at each point of the profile of the object. 5. Application of the method according to claims 3 and 4 to a container with a opening surrounded by a ring, characterized in that in the final phase of immersion the plastic coating at the point of the ring is reduced by a vertical movement Amplitude of the object in the bath is amplified. 6. The method according to claim 1, characterized in that the bath under electrostatic Voltage is set. 7. Device for performing the method according to one of the preceding claims, characterized by one of the items to a preheating furnace (14), a dip tank (20) and a furnace (23) conveying endless chain (4) with for recording the objects (1) provided gripping organs (2, 7, 8, 9, 10). 8. The device according to claim 7, characterized by a connecting device (16, 17, 19) between the endless chain (4) and immersion tank (20) for aligning the object during the diving process. 9. Device according to claims 7 and 8, characterized in that the endless chain (4), when one of the objects (1) is located above the immersion tank (20), is stopped. 10. Device according to claims 7 to 9, characterized by the immersion tank (20) Cam system moving in vertical and horizontal direction. Considered publications:
German interpretation document No. 1006592. 1 sheet of drawings 709 509/198 2.67 © Bundesdruckerei Berlin