U.S. patent application number 10/499079 was filed with the patent office on 2006-02-23 for chemical container for high-pure chemicals.
Invention is credited to Hans-Ulrich Hahn.
Application Number | 20060037931 10/499079 |
Document ID | / |
Family ID | 7707543 |
Filed Date | 2006-02-23 |
United States Patent
Application |
20060037931 |
Kind Code |
A1 |
Hahn; Hans-Ulrich |
February 23, 2006 |
Chemical container for high-pure chemicals
Abstract
Chemical container made of plastics, comprising a body having
side walls being arranged perpendicularly with respect to each
other and a base, whereby at least one mold separation seam or
accumulation of material due to production, respectively, is
arranged in the edge being formed between two side walls and at
least one mold separation seam or a combination of material due to
production, respectively, is arranged diagonally over the base.
Inventors: |
Hahn; Hans-Ulrich;
(Neustadt, DE) |
Correspondence
Address: |
Deborah Chess;Honeywell International Inc
101 Columbia Road
Morristown
NJ
07962
US
|
Family ID: |
7707543 |
Appl. No.: |
10/499079 |
Filed: |
November 26, 2002 |
PCT Filed: |
November 26, 2002 |
PCT NO: |
PCT/EP02/13307 |
371 Date: |
July 15, 2005 |
Current U.S.
Class: |
215/398 |
Current CPC
Class: |
B65D 23/10 20130101;
B65D 2501/0081 20130101; B65D 1/0207 20130101 |
Class at
Publication: |
215/398 |
International
Class: |
B65D 23/10 20060101
B65D023/10 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 30, 2001 |
DE |
101 58 811.9 |
Claims
1. Chemical container made of plastics, comprising: a body (1)
having side walls (1a, 1b, 1c, 1d) being arranged perpendicularly
with respect to each other and a base (4), whereby at least one
mold separation seam (3) or accumulation of material due to
production, respectively, is arranged in the edge being formed
between two side walls (1a, 1b) and at least one mold separation
seam 7 or a combination of material due to production,
respectively, is arranged diagonally over the base 4.
2. Chemical container according to claim 1, the chemical container
being made of high-dense polyethylene (PD-HD), preferably of the
type Lupolen 6021D or Lupolen 5021D.
3. Chemical container according to one of the preceding claims,
whereby two side walls (1a, 1b) of the chemical container being
each formed in their top section such that a partial area (2a, 2b)
of the side wall (1a, 1b) is oriented obliquely backwards out of
the plane of the respective side wall (1a, 1b) and the partial
areas (2a, 2b) together form an area 5 being oriented
perpendicularly with respect to the base 4 and parallel with
respect to one diagonal of the base 4.
4. Chemical container according to claim 3, whereby a handle (6) is
attached at the top and at the bottom to the area (5) to the
chemical container, being oriented substantially symmetrical with
respect to the edges, being formed between two side walls (1a, 1b),
respectively, of the chemical container and being arranged in front
of the area (5) being formed by the partial areas (2a, 2b) of the
side walls being obliquely arranged.
5. Chemical container according to one of the preceding claims,
whereby the handle (6) is arranged such that it does not protrude
in a direction parallel with respect to the cross section area
formed by the base (4) over the base (4).
6. Chemical container according to one of the preceding claims,
whereby the chemical container comprises a handle (6) being formed
in one piece with the chemical container.
7. Use of the chemical container according to one of the preceding
claims for storing and for transport of the chemicals.
8. Use according to claim 7, whereby the chemicals are selected
under: hydrofluoric acid (HF), hydrochloric acid, sulfuric acid,
hydrogen peroxide, ammonium fluoride solutions, etching mixtures of
HF and ammonia solution, ammonia solution, ethanoic acid, 2-propyl
alcohol phosphoric acid, and nitric acid.
Description
[0001] The present invention relates to a chemical container for
storing high-pure liquid chemicals. Such kind of chemical
containers is often made in the shape of a bottles with a handle by
extrusion blowing of high-dense polyethylene (PE-HD). Those
container generally comprise a round bottle-like shape or an edged
bottle-like shape having plane side walls.
[0002] Among others a bottle of the latter type is made out of
high-pure PE-HD, preferably of the type Lupolen 6021D or 5021D by
extrusion blowing. Substantially, the bottle is assembled of two
halves such that a mold separation seam runs from the base up to
the opening in two of the plane side walls. The mold separation
seam continues in the base area of the container.
[0003] However, bottles made of high-pure PD-HD are sensitive for
cracks arising from tension in the material of the container. Those
tensions particularly arise if the vapor pressure of the chemical
in a closed container increases for example by an increased
temperature. Particularly, the plane side walls as well as the base
of the bottle are then subjected to an increased stress as a high
vapor pressure in the interior of the bottle results in that the
side walls and the base are deformed. The vapor pressure deforms
the bottle into a shape of a sphere because of the tendency of the
vapor of the chemical to maximize its volume. Particularly, the
mold separation seam arranged in the plane side walls between the
parts of the bottle are susceptible to cracks which may
particularly arise with an overpressure in the bottle which is
maintained for a longer period.
[0004] This shortcoming may be reduced by the use of bottles
comprising a round shape. However, in the case of bottles having a
round shape significant space is lost between bottles stacked next
to each other if the bottles are for example arranged on pallets in
larger groups for storing or for transport purposes.
[0005] A further possibility to overcome the shortcomings of the
bottles in prior art consists in making the containers more stable
by the use of larger wall thicknesses. However, a corresponding
container comprises a higher weight and are more expensive in
production.
[0006] Thus, it is the object of the present invention to provide a
chemical container being resistant against cracks due to tension,
which nonetheless has little weight and which can be produced at
low cost.
[0007] This object is achieved by a chemical container according to
claim 1. Advantageous embodiments of the inventive chemical
container are given in the dependent claims.
[0008] Thus, the invention relates to a chemical container made of
plastics comprising a body having side walls, which are
perpendicularly arranged with respect to each other, and a base,
whereby at least one mold separation seam or an accumulation of
plastic materials due to the production, respectively, is arranged
in the edge of the chemical container being formed between two side
walls. Moreover, at least one further mold separation seam is
arranged in the base of the chemical container diagonally over the
base.
[0009] By the arrangement according to the invention of at least
one mold separation seam being necessary for the production of the
chemical container, consisting of several extruded parts, in an
edge of the container the danger of cracks in the mold separation
seam is significantly reduced. As no mold separation seams are
present in the preferably plane side walls, the side walls comprise
a uniform distribution of material. Even with increased vapor
pressure and in case of a deformation they remain to the greatest
possible extend free of tension. Constructively the edges of the
container are more stable than the side walls and may not be
deformed easily by an increased vapor pressure. Therefore, the
danger of an occurrence of cracks in a mold separation seam being
arranged there is significantly reduced.
[0010] According to a preferred embodiment the chemical container
is made of high-dense polyethylene (PD-HD), preferably of the type
Lupolen 6021D or Lupolen 5021D. Those materials have proven to be
particularly adapted for a storage of high-pure chemicals as only
very little particles are solved out of the material and can get
into the chemical even during very long contact with the chemicals
or long storage periods, respectively. Preferably, the chemical
containers according to the invention comprise a wall thickness of
1,5-3 mm.
[0011] According to a further preferred embodiment two side walls
of the chemical container are each formed in their upper section
such that a partial area of the side wall is oriented obliquely
backwards out of the plane of the respective side wall. Those
partial areas of the two side walls running obliquely backwards
into opposite directions and towards each other form an area of the
chemical container, which in its completed state, is oriented
substantially perpendicular with respect to the base of the
chemical container and parallel with respect to a diagonal of the
base.
[0012] Preferably, a handle is arranged in front of the area such
formed being attached above and below close to the area or on the
same. By those partial areas of the side walls being oriented
backwards in the upper part of the side walls the volume of the
chemical container is reduced. However, in front of the area
formed, preferably, at the connection line between the two side
walls a handle can be arranged in a way that it does not protrude
laterally over the side walls to which it is attached, which is
substantially perpendicular in the lower part of the chemical
container. Therefore, the chemical container can be stacked
together with further containers of the same kind without being
hindered by their handles.
[0013] According to a further embodiment the elongated or bar-like
handle is arranged symmetrically with respect to the edge being
formed between the side walls of the chemical container and in
front of the area being formed by the partial areas of the side
walls.
[0014] According to yet another preferred embodiment the handle is
arranged such that it does not protrude over the base in a
direction parallel to the cross section being formed through the
base of the chemical container.
[0015] According to another preferred embodiment the chemical
container comprises a handle being blown during the production
process of the parts of the container. This manner of production is
particularly economic as no further step is necessary for attaching
the handle.
[0016] Further features, advantages and possibilities of use of the
present invention will result from the attached drawing, in
which:
[0017] FIG. 1a shows a side view of the inventive chemical
container,
[0018] FIG. 1b shows a further side view of the inventive chemical
container in a position in which the chemical container is turned
around 90.degree. compared to FIG. 1,
[0019] FIG. 1c shows a top view of the inventive chemical
container,
[0020] FIG. 1d shows a view from the bottom of the chemical
container,
[0021] FIG. 2 shows a cross section through a handle of the
chemical container according to FIG. 1b along the line A-A,
[0022] FIG. 3a, b, c, and d show a further embodiment of the
inventive chemical container, and
[0023] FIG. 4 show two cross sectional views along the lines A-B
and C-D of FIG. 3b.
[0024] The chemical container shown in FIG. 1a to 1d comprises a
substantially symmetric body 1 having the shape of a bottle
consisting of four side walls 1a-1d being arranged substantially
perpendicular with respect to each other and a base 4. In the upper
part of the container the side walls end up in an opening 8 of the
chemical container. Below the opening 8 the container comprises a
cylindrical section being provided with a thread. A container may
preferably be closed with a commercial closure according to the
utility model G 91 02 564.8.
[0025] Two side walls 1a, 1b comprise in their upper parts partial
areas 2a and 2b being oriented obliquely backwards with respect to
the plane of the side walls 1a, 1b and in opposite directions
towards each other. In a completed state of the chemical container
those two partial areas 2a, 2b are connected with each other and
form an area 5 being oriented substantially perpendicular with
respect to the base 4 like the side walls 1a-1d. This can be
recognized clearly in FIG. 1b. As it is shown in FIG. 1c the area 5
is slightly curved, however, runs substantially parallel with
respect to a diagonal line of the base 4 of the container. On the
bottom of the base 4 a mold separation seam 7 due to the production
process is arranged. The mold separation seam 7 runs diagonally
over the base 4 between two edges of the same. The mold separation
seam 7 continues up to the container opening 8 in the opposite
edges formed between two side walls.
[0026] As the mold separation seams are not located in the plane
side walls 1a-1d of the chemical container, the side walls 1a-1d
comprise a homogeneous distribution of material and are more
resistant against cracks, particularly during a longer overpressure
and contact of the chemical container with aggressive chemicals.
The mold separation seams are arranged in the edges between the
side walls. As the side walls 1a-1d are connected there under an
angle the chemical container is more stable in those edges for
reasons of their construction against deformations than the side
walls 1a-1d. There, significantly smaller forces are exerted on the
mold separation seams 3 by an increased vapor pressure in the
interior of the chemical container than in the side walls
1a-1d.
[0027] Also the arrangement of the mold separation seam 3 on a
diagonal of the base 4 of the chemical container has the advantage
that this mold separation seam 7 is less subjected to cracks due to
tension as the base 4 is stabilized by the edges through which runs
the diagonal line. Therefore, smaller forces are exerted on a mold
separation seam 7 being arranged in the diagonal by the vapor
pressure than on a mold separation seam 7 being oriented parallel
to the edges of base 4. The mold separation seam 7 being formed in
the base 4 is obtained by squeezing of the extrusion blowing tube
during the production of the chemical container.
[0028] Furthermore the chemical container preferably comprises a
blown handle 6. The handle 6 is arranged in front of the area 5
being formed by the partial areas 2a, 2b of the side walls 1a, 1b
and is attached to the container on top and below at the area 5.
The handle 6 is also preferably assembled of two parts being
separated by the mold separation seam 3. As can be taken from FIG.
1b, the handle 6 is preferably oriented substantially in the
direction of the edges being formed between the side walls 1a-1d.
Preferably, the handle comprises a dimension and a distance between
the area 5 and the handle is designed in a way, respectively, that
the chemical container is adapted for being carried with gloves.
This is necessary since in plenty fields of applications such as in
the semiconductor production the chemical containers are carried
and emptied with gloves. In order to simplify the production
process the handle 6 and the halves of the bottle, respectively,
are preferably formed in the same extrusion blowing process.
However, also containers of the described kind are conceivable
being produced without a handle 6. In this case also the partial
areas 2a, 2b being oriented obliquely backwards may be omitted. The
chemical container then comprises a larger volume. The handle could
also be fixed to the chemical container at its top e.g. on two
sides next to the container opening 8.
[0029] FIG. 2 shows a cross section along the line A-A of the
handle 6. The handle 6 preferably comprises a T-shaped profile.
Thereby, the handle 6 obtains a particularly enlarged stability and
furthermore the danger of a slipping-off of the hand is
reduced.
[0030] FIG. 3a-3d and 4a, 4b show a further embodiment of the
inventive chemical container. This embodiment distinguishes from
the first embodiment with respect to the construction of the handle
6. Parts being identical to parts in FIG. 1a-1d and 2 are denoted
with the same reference numerals. In the present embodiment a
handle 6 comprises a substantially cylindrical body being fixed to
the chemical container by thin webs at the top and at the
bottom.
[0031] FIG. 4a and 4b each show a cross section of the web being
situated at the top and at the bottom, respectively. The top web
comprises a T-shaped profile and the lower web comprises
substantially a flat profile being provided with rips.
[0032] The chemical containers described are adapted for the
reception of high-pure chemicals like e.g. hydrofluoric acid (HF),
hydrochloric acid, sulfuric acid, hydrogen peroxide, ammonium
fluoride solutions, etching mixtures of HF and ammonia solution,
ammonia solution, ethanoic acid, 2-propyl alcohol, phosphoric acid,
and nitric acid.
[0033] Preferably all parts of the chemical container including the
thread and handle 6 are made of the same material, preferably of
high-pure PE-HD, preferably of the type lupolen 6021D or 5021D by
extrusion blowing.
REFERENCE NUMERALS
[0034] (1) body
[0035] (1a-1d) side wall
[0036] (2) a, b partial area
[0037] (3) mold separation seam
[0038] (4) base
[0039] (5) area
[0040] (6) handle
[0041] (7) mold separation seam in the base
[0042] (8) container opening
* * * * *