DE8807824U1 - Hollow plastic body with a shiny outer surface - Google Patents

Description

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"Hollow body made of plastic with a shiny outer surface"

The invention relates to a hollow body made of plastic with a shiny outer surface, which is formed by an extrusion blow molding process from a two-layer tube.

Such hollow bodies are well known. They are used, for example, as packaging material for dishwashing and cleaning products. It is desirable that the outer surface of the hollow body gives a clean and shiny impression in order to encourage the buyer to buy the cleaning product.

A hollow body of this type is known from DE-PL» 25 28. This publication describes an extruded hollow body made of a two-layer thermoplastic, whereby the extrusion of the outer plastic layer takes place at a temperature above the blow mold melting temperature range of the plastic and the inner layer serves as a supporting layer. However, this hollow body only has a sufficiently shiny surface if an exact temperature control can be maintained during the manufacturing process, i.e. if there is a slight deviation from the predetermined temperature, a satisfactory surface gloss cannot be achieved.

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In contrast, the object of the invention is to create a two-layer hollow body made of plastic in a simple manner without particularly precise temperature control during production, which on the one hand is environmentally neutral and cost-effective, and on the other hand has a particularly shiny surface .

This task is carried out using a hollow body as described above.

i aeichen type solved according to the invention in that the \

Hose made of a colored HDPE (high density polyethylene)

density) inner layer and an uncoloured LDPE (poly- \

low density ethylene) - outer layer is formed. t\

It has surprisingly been found that without any special requirements for temperature accuracy during the manufacturing process, i.e. in a particularly simple way, an HDPE-LDPE hose has a particularly shiny outer surface, whereby this shiny effect is particularly enhanced by the fact that the inner layer is colored, while the outer layer has no color pigments. At the same time, the non-colored, shiny outer layer ensures that any scratches that occur are not visible or only slightly visible. In addition, the polyethylene is environmentally friendly and inexpensive and meets the necessary strength requirements. In addition, the use of physically and chemically very similar polymers ensures that the two-layer structure without-

ne use of an adhesion promoter and remains for a long time without impairment, e.g. by flaking of the outer layer.

It has proven to be particularly advantageous that the HDPE content is around 90% and the LDPE content is around 10%.

Finally, in a particularly advantageous embodiment of the invention, the hollow body has been subjected to flame pretreatment to smooth the outer layer. Such a flame pretreatment, which is known per se, before labeling removes any scratches on the surface of the outer layer that may have occurred during transport of the hollow body.

j The invention is described below with reference to the drawing.

example, in more detail. This shows in the only

&idiagr; Figure in schematic representation an embodiment

game .

A hollow body 1 in bottle form for a rinsing or cleaning

3 and an opening 4.

means has an outer wall 2 whose outer surface is

The outer wall 2 consists of an inner layer 5 and an outer layer 6. The inner layer 5 is

«us HDPE (high density polyethylene) and the outer layer 6 made of LDPE (low density polyethylene), whereby the HDPE content is preferably 90% and the LDPE content 10%. The LDPE outer layer 6 is colorless, whereas the HDPE inner layer 5 is colored in a certain color. Due to this two-layer structure of the outer wall 2, the outer surface 3 appears particularly clean and shiny.

The hollow body 1 is formed by an extrusion blow molding process from a tube produced by coextrusion of the two polymers (HDPE and LDPE).

After the hollow bodies 1 have been manufactured, they are usually stored temporarily before they are filled and labeled. During transport of the hollow bodies 1, mechanical stress can cause damage to the outer layer 6 of the hollow bodies 1, such as scratches. These scratches can be eliminated after the hollow bodies 1 have been filled by a conventional flame pretreatment before labeling. Such a flame pretreatment is not only suitable for improving the adhesion of labels to the outer surface of hollow bodies 1, but also surprisingly eliminates damage to the outer layer 6 of hollow bodies 1.

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Of course, the invention is not limited to the embodiment described in the drawing. Other embodiments are possible without departing from the basic idea. In particular, the exact composition of the
Hollow body material is not specified and the like.

Claims (2)

PATENT ATTORNEYS MEINKE AND DABRINGHAUS ADMITTED TO BBM EUROPEAN PATENT OFFICE · EUROPEAN PATENT ATTORNEYS · MANDATAIRES EN BREVETS EUROPEE DIPL-ING. J. &Mgr;&Xgr;&Ngr;&Kgr;&Egr; DIPL-ING. W. DABRINGHAiJS 46OO DORTMUND 1. Jc J^j WESTENHELLWEG 67 * ' JM/B PHONE (0231)145071 TELEGRAM EXDPAT Dortmund TELEX 8227328 pat d FAX (0231)147670 FILE NO: 43(3/6647 D804? Applicant: Henkel Kommanditgesellschaft auf Aktien, Henkelstraße 67, 4000 Düsseldorf 1 Expectations ; 1. Hollow body made of plastic with a shiny outer surface, which is formed by an extrusion blow molding process from a two-layer tube / characterized in that that the hose is made of a colored HDPE (high density polyethylene) inner layer (5) and an uncolored LDPE (low density polyethylene) outer layer (6). 2. Hollow body according to claim 1,
characterized, that the HDPE content is about 90% and the LDPE content is about 10%. &bull;&igr; > Ii >&igr; · · «· ··■ »&idigr;&idigr;&igr;··· &bull; 111 ■ 1 > > 1 ·· ·· »t 111 Il IIS ■· 1 &bull; t 1 ) »ill I ·■ < Hollow body according to claim 1 or 2, characterized, that it is used to smooth the outer layer (6) of a Flairan preparation has been subjected to treatment.