CA2182983A1 - Bag and method for packaging granular compounds - Google Patents
Bag and method for packaging granular compoundsInfo
- Publication number
- CA2182983A1 CA2182983A1 CA 2182983 CA2182983A CA2182983A1 CA 2182983 A1 CA2182983 A1 CA 2182983A1 CA 2182983 CA2182983 CA 2182983 CA 2182983 A CA2182983 A CA 2182983A CA 2182983 A1 CA2182983 A1 CA 2182983A1
- Authority
- CA
- Canada
- Prior art keywords
- bag
- spout portion
- lead
- spout
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/16—Bags or like containers made of paper and having structural provision for thickness of contents of special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
- B65B55/24—Cleaning of, or removing dust from, containers, wrappers, or packaging ; Preventing of fouling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
- Packages (AREA)
Abstract
A bag and method for packaging granular compounds and especially dust-prone lead-based stabilizer compounds. The bag (10) is preferably formed from a thermoplastic film, such as low molecular weight ethylene vinyl acetate copolymer (EVA) film which is initially sealed around substantially its entire periphery (16, 18, 20, 22) prior to filling the bag (10) with the lead-based heat stabilizer compound (36). The bag (10) includes a relatively small diameter spout portion (26) extending outwardly from a main body portion (12). The spout portion (26) is sealed except for an open end (28) through which the bag (10) may be filled with granular compound (36) by a filling tube (32). The end of the spout portion (26) includes a cuff (31) which is folded back onto the spout portion (26) to prevent contamination thereof with the granular compound (36). When the cuff (31) is unfolded, a heat sealable area is defined between an outer edge (28) of the spout portion and a discretely formed fold line (30).
Description
wogul~u~ 2 i 8 2 9 8 3 r~s9al~
.
, BAG AND MFTHOD FOR PACi-<AGlNG GRANIll A~ COMPOUNDS
u uu~d Uf me Invent~ûn The present invention ~eneraily relates to 8 b~ and method for ~ ranular compounds, ~ lead-based, dust-prone ~ranular compounds.
Lead-based compounds such as dibssic lead phthalate, tribasic lead sulfate, dibasic lead phosphite, dibasic and normal lead stearates, as well as others, are col"iJ~ d some of the most effective and least ~A~,e....;~r~ pol~v;.,,~l~.l,lu.ida (PVC) heat ' " :,.
Lead-based compounds such as these are widely used as additives in r 10 many ~ 5 using PVC, such as in the extrusion of wire coverin~s, despite their chronic toxicity. It is also well known that chronic toxicity problems involvini~ lead-based compounds may be avoided by ~ ~a~ a inhalation and in~estion of airborne dusts wo srillOos42 2 1 8 2 9 8 3 1 ~-".~
.
, BAG AND MFTHOD FOR PACi-<AGlNG GRANIll A~ COMPOUNDS
u uu~d Uf me Invent~ûn The present invention ~eneraily relates to 8 b~ and method for ~ ranular compounds, ~ lead-based, dust-prone ~ranular compounds.
Lead-based compounds such as dibssic lead phthalate, tribasic lead sulfate, dibasic lead phosphite, dibasic and normal lead stearates, as well as others, are col"iJ~ d some of the most effective and least ~A~,e....;~r~ pol~v;.,,~l~.l,lu.ida (PVC) heat ' " :,.
Lead-based compounds such as these are widely used as additives in r 10 many ~ 5 using PVC, such as in the extrusion of wire coverin~s, despite their chronic toxicity. It is also well known that chronic toxicity problems involvini~ lead-based compounds may be avoided by ~ ~a~ a inhalation and in~estion of airborne dusts wo srillOos42 2 1 8 2 9 8 3 1 ~-".~
~" , ,9 these lead compounds. ~lor,~tl,~iu..~
precautions against inhalation and ingestion are often not taken by the personnel handling lead-based powders during the batch ~,u-.~ss;,l~ of PVC.
One possible solution to the problem includes isolating the lead-based powders, or other dust-prone forms of lead-based compounds, within a contained system which would not expose the personnel to airborne, lead-c~" ~9 dust created durin~ batch p~U~GSS;~9. Another possible solut~on ~s to utilize lead-based PVC
heat ' :. which have been ~u~,G;~ d into a "non-dusting"
form, i.e., a form which does not create the airborne c~"l .., ,el"l:, created by powdars. Such non-dusting forms include, for example, prills and pastes. The i, ' ) of cc"" ' ~ contained systems is very ~A,u~n~h/ and is therefore not a practical solution for most i.~" ~s. The use of lead-based compounds in non-dusting form aiso adds expense and, in addition, reduces the ease of ill..~l~JOlali"g the lead stabilizer into the PVC and leaves the problem of container disposal which is of critical 611J;lUlllllelll~ Jullal)c~.
A low melting temperature ethylene vinyl acetate copoly."~r lEVA~ film has been disclosed in U.S. Patant No.
5,120,787 ~the '787 patent) as being useful for makin~ bags and compounding tub liners. The '787 patent discloses that rubber dL~Jel:~iull:> contained in the bags or tub iiners may then be added to hi~ih intensive mixers whereupon the contents thereof are mixed into 2~ 82983 WO 96118S42 P~, 11 ., ~., ~1 1~.. ,~.
precautions against inhalation and ingestion are often not taken by the personnel handling lead-based powders during the batch ~,u-.~ss;,l~ of PVC.
One possible solution to the problem includes isolating the lead-based powders, or other dust-prone forms of lead-based compounds, within a contained system which would not expose the personnel to airborne, lead-c~" ~9 dust created durin~ batch p~U~GSS;~9. Another possible solut~on ~s to utilize lead-based PVC
heat ' :. which have been ~u~,G;~ d into a "non-dusting"
form, i.e., a form which does not create the airborne c~"l .., ,el"l:, created by powdars. Such non-dusting forms include, for example, prills and pastes. The i, ' ) of cc"" ' ~ contained systems is very ~A,u~n~h/ and is therefore not a practical solution for most i.~" ~s. The use of lead-based compounds in non-dusting form aiso adds expense and, in addition, reduces the ease of ill..~l~JOlali"g the lead stabilizer into the PVC and leaves the problem of container disposal which is of critical 611J;lUlllllelll~ Jullal)c~.
A low melting temperature ethylene vinyl acetate copoly."~r lEVA~ film has been disclosed in U.S. Patant No.
5,120,787 ~the '787 patent) as being useful for makin~ bags and compounding tub liners. The '787 patent discloses that rubber dL~Jel:~iull:> contained in the bags or tub iiners may then be added to hi~ih intensive mixers whereupon the contents thereof are mixed into 2~ 82983 WO 96118S42 P~, 11 ., ~., ~1 1~.. ,~.
the other contents ~n the mixer. The EVA film ~ melts and disperses into the mixture.
The '787 pstent, however, does not disclose any solution to the specific problems r--- ' ' ' with lesd-based powders. In this re~ard, while the formation of b~s from low meltin~ temperature EVA film is ~enerally disclosed by the patent, the ~ of lead-based compounds in bs~s formed from this EVA film presents ~;ulliri~.a~lL ~ ' For example, lead stabilizer powders are hi~hly ener~y absorptive and, for this reason, they will often prevent the effective heat or ultrasonic sealin3 of the ba~
opening merely by be bein~ present at the open ed~es durin~ the heat sealin~ operation. An ineffective seal at the bag openin~ may take the form of either an actual leak or a ~ ed portion of the seal which is likely to break open and cause a leak. The hi~h density of the lead-based stabilizer powders t~.a~ iJaL~ the problem by creatin~ leaks throur~h physical pressure applied at portions of the seal v,~ ' ~ed du~ to the presence of the lead stabilizer powder durin~ the sealing operation.
Certain ba~s have also been ~enerally disclosed with fillin~ spouts havin~ a reduced diameter. Such barJs are ~ rl~s~d.
for example, in U.S. Patent Nos. 2,918,958; 3,016,284; 3,051,605;
and 3,208,661. These ba~s are not, however, directed to the specific problems III~IILi~ d above with respect to the pdC
and co, Illle:llL of lead-based stabilizer compounds.
WO 96rl8542 2 1 8 2 ~ 8 3 PClNS95rl5958 0 It would therefore be desirable to provide 8 ba~ and a method of ~ o~ ,d or other dust-prone forms of lead-based heat stabilizer compounds which would ensure full, ~ffective sealin~ of the ba~ and its contents and allow the ba~ to be ~ r melted and dispersed when used, for example, in the batch p,u.,es~ of PVC.
Summ~nr of th~ Invention The present ~nvention is directed to a ba~ and a method of, ' _ ,~ ~ranular compounds, such as dust-prone, lead-based h~at stabilizer compounds. More _, _ '' `Iy, especially when F ~ lead-based compounds, the ba~ is formed frorn a Lll .,. ,' film which is ~.uf~..dl,ly a low molecular wei~ht EVA
film. The ba~ is initially sealed around suL .Ic.. 'Iy its ~ntire periphery prior to fillin~ the ba~ with the lead-based h~at stabilizer compound. The ba~ includes a main body portion and a reduced diameter spout port~on or "snorkel rrlouth" extendin~ outwardly r,u..,. ~,~r~,aLly, the spout portion axtends laterally from the main body portion of the bag adjacent to one end thereof. The spout portion is sealed about its periphery but includes an open end throush which the ba~ may be filled with lead stabilizer compound by an inserted fillin~ tube.
The end of the spout portion ~ rt:laLly includes a cuff which is folded back onto the spout portion. This cuff ensures that lead stabilizer compound does not contact the outer, unsealed ed~es 21 82:983 wo 96118542 r~
of the spout port~on durinaO the filling operation. That is since the outer unsealed ednOes of the spout portion sre folded over onto the outs~de of the spout port~on. contact w~th the lead stab~l~zcr compound be~nO ~ o~d ~nto the baO is ~ . tvd. Thls combined with the isolatinnO effect of the spout port~on ~tself helps to . ~ prevent cu.lL~IIl;.l_~iu.. of the outer unsealed edOes by lead stab~l~zer compound. As ~ ion~ above due to the enernOy absorpt~v~ ~ .up_.li~s of lead based compounds such C~lllalll l~livn would often result in d~srupt~nOn the heat or ultrason~c seal~nOn thereof after the f~ nnO operst~on and therefore create a w~ I d or leak~nû
area in the seal. In add~t~on the isolated location and relatively small iVI~ of the spout portion further prevent ~iU~Iiric~ l amounts of phys~cal pressure from be~nO exerted on the f~na~ outer seal thereof.
The method of ~ k_o ~rO lead-based stab~l~zer compounds ac~ to the present ~nvent~on ~ncludes prov~d~nnO a ba~ havinû a ma~n body port~on and a spout port~on extend~n~
I~l_. :rlulll by seal~nnO around the ent~re per~phery of the ma~n body port~on but leav~n~ an outer end of the spout port~on open. The outer ûpen end of the spout port~on ~s folded back ~nto a cuff. A
filling tube is inserted into the spout portion and the banO is filled with a dust-prone lead-based stabil~zer compound which may be a powder. When the banO is full the fillin~ tube is ~: ~v . . .l from the spout portion and the cuff is unfolded. The outer open end of the ~ 82~8~
W096/18542 1~.I11~.NI~,./ O
spout portion is then sealed by 8 heat sealin~ procedure. In this renOard, as used throuOahout the al - ~ir;~.l;nn and claims, the term heat seal" broadly l..~G~ ,; other forms of sealin~ by the use of radiant enernOy, such as uitrasonic enernoy~ In the preferred b ~ " ,l, a defined hld line is formed by the cuff to indicate the u"c~, , ' area of the spout portion which should receive the heat or ultrasonic seal.
It is further c~ Jldt~d that tha "snorkel mouth- banO
construction which includes the cuff and fold line for the purpose indicated above may be useful in 8=,, " ' i~ other than the _ ~d of dust-prone lead-based compounds. Therefore, for any nOranular compound which would tend, for example, to interfere with the heat sealinnO of a baOn as ",o.,lioncJ above, the use of a ba~
havinnO a cuffed spout portion inlcudinnO a defined fold line for indicatinnO where the final heat seal should be made would be part~cularly 6~va,~lalOeous.
The banOs and j~a k~O ~nO methods of this invention, alonnO with the various advantanOes and other aspQCts thereof, will be further ulld~ ùod with reference to the followinnO detailed des~ Liuil thereof taken in conjunction with the acc~""~6"yinnO
drawin~s.
Brlef D~3c,i~ of the Drawlng~
FinO. 1 iS a front ~ aLiullcll view of a banO formed accordinnO to the present invention and shown in an empty conditiûn;
2~ 82983 Fi~q. 2 is a front . :. - 7~1 view of a ba~ as in Fi~j. 1 but showin~ a fillin~ tube inserted to fill the ba3 with lead-based stabilizer powder; and, Fi~. 3 is a front Llv /.~tiO~Ial view of a bag as in Figs. 1 and 2 but showin~ the bâ~ f~lled with a quantity of lead-based stab~lizer compound and c~", ~ sealed.
De- Dv~ n of the PreferrQd E~rh~clirnent Referrin~ to Fi~s. 1 and 2, a lvad stabilizer ba~ 10 made a ,cv" 7~ to the a preferred L.,IL- lalll of the invention is illustrated. S~ - Iy, ba~ 10 includes two sheets 12, 14 (Fi~j. 2) of polymer film. The film is a heat sealable, low molecular wel~jht ethylene vinyl acetate ~vopolv,nv~ (EVAl havin~ a low meltin~j po~nt, ~vfv.ai;l~ below about 170 F. The preferred EVA copolyn~
useful in the ba~ and method of the present invention are disclosed in U.S. i atent No. 5,120,787 (the 787 patent), the disclosure of wh~ch is hereby fully and expressly i~lvul~ulatvd herein by reference.
Generally, the EVA cop~ly.,,v, used in forminov ba~ 10 includes a vinyl acetate content of at least about 25% and may include other resins, fillers and additives, such as those disclosed in the 787 patent, while lll ~ ~d the low meltin~ temperature and heat seâling plup~ s thereof.
Ba~ 10 is initially formed by sealin~ peripheral ed~es 16, 18, 20, 22 and 24 to~ether, as by heat or ultrasonic seals. As further shown in Fi~. 1, for exsmple, ba~ 10 includes a reduced WO96118542 2~ 3 PCTIUS95/15958 diameter spout port~on 26 eAl~ laterally from a main body portion 27. Spout portion 26 ~S defined between ed~es 24 and 16 of ba~ 10. In the ba~'s empty state shown in Fi~. 1, spout port~on 26 includes two unsealed, outer edges 28 which definQ the only 6 openin~ to bai~ 10. Spout portion 26 further includes a discrete foid line 30 at a distance spaced inwardly from outer ed~es 28. Fold lin~
30 iS ~lufu..Jijly a crease in spout portion 26. The distance between fold line and outer ed~es 28 may be, for exampie, SIPPIUA;~ IY 2 inches when spout portion 26 has a len~th of about 63~ inches and a width of about 51/~.", and main body portion 27 has a len~ith of about 28 inches and a width of about 13 inches.
As shown in Fi~. 2, the outer end of spout portion 26 msy be folded back into a cuff 31 defined between outer ~d~es 28 and foid line 30. Durini3 a fillin~ operation, a flll tube 32 is inserted throu~h spout portion 26 and into main body portion 27 of ba~ 10.
Fill tube 32 includes a conver~in~i open end 34 to aid in the insertion thereof and to allow lead stabilizer compound 36 to b~ ,l)a,ued ~nto bag 10. As --t:llli~ned above, any of the typical lead-based PVC
hest stabili2er compounds, in iJL..J~lt t~d or other dust-prone forms, may be introduced into the bai; dep~ on the needs of the ~rr. ~ or the desires of the end user. Thes~ msy include, for example, pO.Jd~ i forms of dibasic lead phthalate, tribasic lead sulfate, dibasic lead phosphite, ~nd dibasic or normal lead stearates.
When ba~ 10 is filled with the desired amount of lead-based ~I W0 96/18s42 r~ 5,~
g stabiiizer powder 36, such as thr~ exsct amount required to bo add~d to a PVC batch mixer, fillinq tube 32 is . h i~ , cuff 31 (FiEj. 2~ ~s unfolded and a final heat seal 38 i5 placed between outer ed~es 28 and fold line 30 as shown ~n Fi~. 3.
Referrin~ now to Firjs. 1-3, the preferred method of _ rj lead-based stabilizer powders in a ba~ 10 of the present invention includes providinrJ ba~ 10 with a main body portion 27 and a spout portion 26 ".t~ Ll ~,r,..~.. with bsrJ ~0 includin~
'~ sealed edEies around suL;.Ia., 'I~ the entire periphery thereof, i.e., at edges 16, 18, 20, 22 and 24, while leavin~ an outer end 28 of spout portion 26 open. The outer, open end 28 of spout portion 26 is folded back into a cuff 31 (Fi~. 2~ at fold line 30, f~.dLI~ well prior to the ins~rtion of fillinrj tube 32 for the purposes of speedinrj the ~ process. FillinEj tube 32 is inserted into spout portion 26 and ba~ 10 is filled with a dust-prone lead-based stabilizer compound 36, such as a powder. When ba~ 10 is filled with the desired amount of lead stabilizer powder 36, fillin~
tube 32 is .;tl~ .., from spout portion 26 and cuff 31 is unfolded as shown in Fig. 3. Usin~ outer edEjes 28 and fold line 30 of spout portions as boundary lines markin~ the area of spout portion 26 ~llc~nllalll lal~i by lead stabilizer powder 36, a final heat seal 38 is applied lI.~ to cc.,., ': '~ seal the periphery of ba~ 10.
Ba~ 10 may then be added to a PVC mixer whereupon it will melt and c~.., ': 'y disperse in the PVC.
WO 96/18542 ~ 3 PCT/US951159~8 ~
By way of the fore~o~n~, it will be ~p~ that a ba~ and method for, E ,~ dust-prons l~ad stabilizer compound has been provided with the combined ~ of onablin~ fast, efficient addition of put~... Iy hazardous lead compounds to PVC
5 m~xers while .. , .. i ;,.~q exposure of personnel to airborne particles c~.. ..~ Iead compounds~
It is cvll~ that the unique ~" ,~-tiu-, of a Il, ." ~ ba3 hav~n~ a cuffed spout portion as descr~bed above would be ~v.,.I~ us for ~p~ .. other than the lead stab~l~zer ~,1, n detailed above but in wh~ch sim~lar problems may ex~st.
For these reasons, the invention in th~s broader aspect, should not be lim~ted to the d~ta~ls ~ven here~n w~th respect to lead-based compounds.
Wh~le preferred u.llL ".,.,l~ of the present invent~on have been descr~bed above, vsrious Illu~l~ri-,aLi~lls w~ll become resd~ly sppsrent to those of ordinary skill without departin~ from the sp~r~t and scope of the invention and Applicant therefore intends to be bound oniy by the clsims appended hereto.
The '787 pstent, however, does not disclose any solution to the specific problems r--- ' ' ' with lesd-based powders. In this re~ard, while the formation of b~s from low meltin~ temperature EVA film is ~enerally disclosed by the patent, the ~ of lead-based compounds in bs~s formed from this EVA film presents ~;ulliri~.a~lL ~ ' For example, lead stabilizer powders are hi~hly ener~y absorptive and, for this reason, they will often prevent the effective heat or ultrasonic sealin3 of the ba~
opening merely by be bein~ present at the open ed~es durin~ the heat sealin~ operation. An ineffective seal at the bag openin~ may take the form of either an actual leak or a ~ ed portion of the seal which is likely to break open and cause a leak. The hi~h density of the lead-based stabilizer powders t~.a~ iJaL~ the problem by creatin~ leaks throur~h physical pressure applied at portions of the seal v,~ ' ~ed du~ to the presence of the lead stabilizer powder durin~ the sealing operation.
Certain ba~s have also been ~enerally disclosed with fillin~ spouts havin~ a reduced diameter. Such barJs are ~ rl~s~d.
for example, in U.S. Patent Nos. 2,918,958; 3,016,284; 3,051,605;
and 3,208,661. These ba~s are not, however, directed to the specific problems III~IILi~ d above with respect to the pdC
and co, Illle:llL of lead-based stabilizer compounds.
WO 96rl8542 2 1 8 2 ~ 8 3 PClNS95rl5958 0 It would therefore be desirable to provide 8 ba~ and a method of ~ o~ ,d or other dust-prone forms of lead-based heat stabilizer compounds which would ensure full, ~ffective sealin~ of the ba~ and its contents and allow the ba~ to be ~ r melted and dispersed when used, for example, in the batch p,u.,es~ of PVC.
Summ~nr of th~ Invention The present ~nvention is directed to a ba~ and a method of, ' _ ,~ ~ranular compounds, such as dust-prone, lead-based h~at stabilizer compounds. More _, _ '' `Iy, especially when F ~ lead-based compounds, the ba~ is formed frorn a Lll .,. ,' film which is ~.uf~..dl,ly a low molecular wei~ht EVA
film. The ba~ is initially sealed around suL .Ic.. 'Iy its ~ntire periphery prior to fillin~ the ba~ with the lead-based h~at stabilizer compound. The ba~ includes a main body portion and a reduced diameter spout port~on or "snorkel rrlouth" extendin~ outwardly r,u..,. ~,~r~,aLly, the spout portion axtends laterally from the main body portion of the bag adjacent to one end thereof. The spout portion is sealed about its periphery but includes an open end throush which the ba~ may be filled with lead stabilizer compound by an inserted fillin~ tube.
The end of the spout portion ~ rt:laLly includes a cuff which is folded back onto the spout portion. This cuff ensures that lead stabilizer compound does not contact the outer, unsealed ed~es 21 82:983 wo 96118542 r~
of the spout port~on durinaO the filling operation. That is since the outer unsealed ednOes of the spout portion sre folded over onto the outs~de of the spout port~on. contact w~th the lead stab~l~zcr compound be~nO ~ o~d ~nto the baO is ~ . tvd. Thls combined with the isolatinnO effect of the spout port~on ~tself helps to . ~ prevent cu.lL~IIl;.l_~iu.. of the outer unsealed edOes by lead stab~l~zer compound. As ~ ion~ above due to the enernOy absorpt~v~ ~ .up_.li~s of lead based compounds such C~lllalll l~livn would often result in d~srupt~nOn the heat or ultrason~c seal~nOn thereof after the f~ nnO operst~on and therefore create a w~ I d or leak~nû
area in the seal. In add~t~on the isolated location and relatively small iVI~ of the spout portion further prevent ~iU~Iiric~ l amounts of phys~cal pressure from be~nO exerted on the f~na~ outer seal thereof.
The method of ~ k_o ~rO lead-based stab~l~zer compounds ac~ to the present ~nvent~on ~ncludes prov~d~nnO a ba~ havinû a ma~n body port~on and a spout port~on extend~n~
I~l_. :rlulll by seal~nnO around the ent~re per~phery of the ma~n body port~on but leav~n~ an outer end of the spout port~on open. The outer ûpen end of the spout port~on ~s folded back ~nto a cuff. A
filling tube is inserted into the spout portion and the banO is filled with a dust-prone lead-based stabil~zer compound which may be a powder. When the banO is full the fillin~ tube is ~: ~v . . .l from the spout portion and the cuff is unfolded. The outer open end of the ~ 82~8~
W096/18542 1~.I11~.NI~,./ O
spout portion is then sealed by 8 heat sealin~ procedure. In this renOard, as used throuOahout the al - ~ir;~.l;nn and claims, the term heat seal" broadly l..~G~ ,; other forms of sealin~ by the use of radiant enernOy, such as uitrasonic enernoy~ In the preferred b ~ " ,l, a defined hld line is formed by the cuff to indicate the u"c~, , ' area of the spout portion which should receive the heat or ultrasonic seal.
It is further c~ Jldt~d that tha "snorkel mouth- banO
construction which includes the cuff and fold line for the purpose indicated above may be useful in 8=,, " ' i~ other than the _ ~d of dust-prone lead-based compounds. Therefore, for any nOranular compound which would tend, for example, to interfere with the heat sealinnO of a baOn as ",o.,lioncJ above, the use of a ba~
havinnO a cuffed spout portion inlcudinnO a defined fold line for indicatinnO where the final heat seal should be made would be part~cularly 6~va,~lalOeous.
The banOs and j~a k~O ~nO methods of this invention, alonnO with the various advantanOes and other aspQCts thereof, will be further ulld~ ùod with reference to the followinnO detailed des~ Liuil thereof taken in conjunction with the acc~""~6"yinnO
drawin~s.
Brlef D~3c,i~ of the Drawlng~
FinO. 1 iS a front ~ aLiullcll view of a banO formed accordinnO to the present invention and shown in an empty conditiûn;
2~ 82983 Fi~q. 2 is a front . :. - 7~1 view of a ba~ as in Fi~j. 1 but showin~ a fillin~ tube inserted to fill the ba3 with lead-based stabilizer powder; and, Fi~. 3 is a front Llv /.~tiO~Ial view of a bag as in Figs. 1 and 2 but showin~ the bâ~ f~lled with a quantity of lead-based stab~lizer compound and c~", ~ sealed.
De- Dv~ n of the PreferrQd E~rh~clirnent Referrin~ to Fi~s. 1 and 2, a lvad stabilizer ba~ 10 made a ,cv" 7~ to the a preferred L.,IL- lalll of the invention is illustrated. S~ - Iy, ba~ 10 includes two sheets 12, 14 (Fi~j. 2) of polymer film. The film is a heat sealable, low molecular wel~jht ethylene vinyl acetate ~vopolv,nv~ (EVAl havin~ a low meltin~j po~nt, ~vfv.ai;l~ below about 170 F. The preferred EVA copolyn~
useful in the ba~ and method of the present invention are disclosed in U.S. i atent No. 5,120,787 (the 787 patent), the disclosure of wh~ch is hereby fully and expressly i~lvul~ulatvd herein by reference.
Generally, the EVA cop~ly.,,v, used in forminov ba~ 10 includes a vinyl acetate content of at least about 25% and may include other resins, fillers and additives, such as those disclosed in the 787 patent, while lll ~ ~d the low meltin~ temperature and heat seâling plup~ s thereof.
Ba~ 10 is initially formed by sealin~ peripheral ed~es 16, 18, 20, 22 and 24 to~ether, as by heat or ultrasonic seals. As further shown in Fi~. 1, for exsmple, ba~ 10 includes a reduced WO96118542 2~ 3 PCTIUS95/15958 diameter spout port~on 26 eAl~ laterally from a main body portion 27. Spout portion 26 ~S defined between ed~es 24 and 16 of ba~ 10. In the ba~'s empty state shown in Fi~. 1, spout port~on 26 includes two unsealed, outer edges 28 which definQ the only 6 openin~ to bai~ 10. Spout portion 26 further includes a discrete foid line 30 at a distance spaced inwardly from outer ed~es 28. Fold lin~
30 iS ~lufu..Jijly a crease in spout portion 26. The distance between fold line and outer ed~es 28 may be, for exampie, SIPPIUA;~ IY 2 inches when spout portion 26 has a len~th of about 63~ inches and a width of about 51/~.", and main body portion 27 has a len~ith of about 28 inches and a width of about 13 inches.
As shown in Fi~. 2, the outer end of spout portion 26 msy be folded back into a cuff 31 defined between outer ~d~es 28 and foid line 30. Durini3 a fillin~ operation, a flll tube 32 is inserted throu~h spout portion 26 and into main body portion 27 of ba~ 10.
Fill tube 32 includes a conver~in~i open end 34 to aid in the insertion thereof and to allow lead stabilizer compound 36 to b~ ,l)a,ued ~nto bag 10. As --t:llli~ned above, any of the typical lead-based PVC
hest stabili2er compounds, in iJL..J~lt t~d or other dust-prone forms, may be introduced into the bai; dep~ on the needs of the ~rr. ~ or the desires of the end user. Thes~ msy include, for example, pO.Jd~ i forms of dibasic lead phthalate, tribasic lead sulfate, dibasic lead phosphite, ~nd dibasic or normal lead stearates.
When ba~ 10 is filled with the desired amount of lead-based ~I W0 96/18s42 r~ 5,~
g stabiiizer powder 36, such as thr~ exsct amount required to bo add~d to a PVC batch mixer, fillinq tube 32 is . h i~ , cuff 31 (FiEj. 2~ ~s unfolded and a final heat seal 38 i5 placed between outer ed~es 28 and fold line 30 as shown ~n Fi~. 3.
Referrin~ now to Firjs. 1-3, the preferred method of _ rj lead-based stabilizer powders in a ba~ 10 of the present invention includes providinrJ ba~ 10 with a main body portion 27 and a spout portion 26 ".t~ Ll ~,r,..~.. with bsrJ ~0 includin~
'~ sealed edEies around suL;.Ia., 'I~ the entire periphery thereof, i.e., at edges 16, 18, 20, 22 and 24, while leavin~ an outer end 28 of spout portion 26 open. The outer, open end 28 of spout portion 26 is folded back into a cuff 31 (Fi~. 2~ at fold line 30, f~.dLI~ well prior to the ins~rtion of fillinrj tube 32 for the purposes of speedinrj the ~ process. FillinEj tube 32 is inserted into spout portion 26 and ba~ 10 is filled with a dust-prone lead-based stabilizer compound 36, such as a powder. When ba~ 10 is filled with the desired amount of lead stabilizer powder 36, fillin~
tube 32 is .;tl~ .., from spout portion 26 and cuff 31 is unfolded as shown in Fig. 3. Usin~ outer edEjes 28 and fold line 30 of spout portions as boundary lines markin~ the area of spout portion 26 ~llc~nllalll lal~i by lead stabilizer powder 36, a final heat seal 38 is applied lI.~ to cc.,., ': '~ seal the periphery of ba~ 10.
Ba~ 10 may then be added to a PVC mixer whereupon it will melt and c~.., ': 'y disperse in the PVC.
WO 96/18542 ~ 3 PCT/US951159~8 ~
By way of the fore~o~n~, it will be ~p~ that a ba~ and method for, E ,~ dust-prons l~ad stabilizer compound has been provided with the combined ~ of onablin~ fast, efficient addition of put~... Iy hazardous lead compounds to PVC
5 m~xers while .. , .. i ;,.~q exposure of personnel to airborne particles c~.. ..~ Iead compounds~
It is cvll~ that the unique ~" ,~-tiu-, of a Il, ." ~ ba3 hav~n~ a cuffed spout portion as descr~bed above would be ~v.,.I~ us for ~p~ .. other than the lead stab~l~zer ~,1, n detailed above but in wh~ch sim~lar problems may ex~st.
For these reasons, the invention in th~s broader aspect, should not be lim~ted to the d~ta~ls ~ven here~n w~th respect to lead-based compounds.
Wh~le preferred u.llL ".,.,l~ of the present invent~on have been descr~bed above, vsrious Illu~l~ri-,aLi~lls w~ll become resd~ly sppsrent to those of ordinary skill without departin~ from the sp~r~t and scope of the invention and Applicant therefore intends to be bound oniy by the clsims appended hereto.
Claims (12)
1. A bag for packaging dust-prone, lead-based stabilizer compounds, the bag comprising a film formed from an ethylene vinyl acetate copolymer and shaped to define a main body portion and a reduced diameter spout portion extending from said main body portion, said main body portion being sealed around a periphery thereof and said spout portion having an open outer end for allowing introduction of said dust-prone, lead-based compounds into said main body portion.
2. The bag of claim 1 wherein said bag is formed from two sheets of said ethylene vinyl acetate copolymer heat sealed about their periphery except at said open outer end of said spout portion.
3. The bag of claim 1 wherein said spout portion includes a cuff folded back at said outer end.
4. The bag of claim 3 wherein said cuff is defined between outer edges of said spout portion and a discrete fold line in said spout portion, said outer edges and said discrete fold line thereby defining boundary lines for receiving a final heat seal therebetween.
5. The bag of claim 1 wherein said spout portion extends laterally from one end of said main body portion.
6. The bag of claim 1 wherein said ethylene vinyl acetate copolymer has a vinyl acetate content of at least about 25% by weight and a melting point below about 170° F.
7. A bag formed of a thermoplastic film and shaped to define a main body portion and a reduced diameter spout portion extending from said main body portion, said main body portion being sealed around a periphery thereof and said spout portion having an open outer end for allowing introduction of granular material into said main body portion, said spout portion further including a cuff folded back at a discrete fold line at said open outer end.
8. A method of packaging a granular compound comprising the steps of:
providing a bag formed from a thermoplastic film and having a main body portion and a reduced spout portion, said bag being sealed around a peripheral portion thereof but open at an outer end of said spout portion and said spout portion including a cuff portion defined by a discrete fold line disposed at said outer end;
filling said bag with said granular compound through said spout portion;
unfolding said cuff portion; and, heat sealing across said spout portion at a position between an outer edge of said spout portion and said fold line to completely seal said granular compound within said bag.
providing a bag formed from a thermoplastic film and having a main body portion and a reduced spout portion, said bag being sealed around a peripheral portion thereof but open at an outer end of said spout portion and said spout portion including a cuff portion defined by a discrete fold line disposed at said outer end;
filling said bag with said granular compound through said spout portion;
unfolding said cuff portion; and, heat sealing across said spout portion at a position between an outer edge of said spout portion and said fold line to completely seal said granular compound within said bag.
9. A method of packaging a dust-prone, lead-based stabilizer compound comprising the steps of:
providing a bag formed from an ethylene vinyl acetate copolymer film and having a main body portion and a reduced spout portion, said bag being sealed around a peripheral portion thereof but open at an outer end of said spout portion;
filling said bag with said dust-prone, lead-based stabilizer compound through said spout portion; and, heat sealing said spout portion to completely seal said dust-prone, lead-based stabilizer compound within said bag.
providing a bag formed from an ethylene vinyl acetate copolymer film and having a main body portion and a reduced spout portion, said bag being sealed around a peripheral portion thereof but open at an outer end of said spout portion;
filling said bag with said dust-prone, lead-based stabilizer compound through said spout portion; and, heat sealing said spout portion to completely seal said dust-prone, lead-based stabilizer compound within said bag.
10. The method of claim 9 wherein further comprising the step of folding an outer end of said spout portion back into a cuff before filling said bag and unfolding said cuff before heat sealing said spout portion.
11. The method of claim 10 wherein said cuff is defined between an outer edge of said spout portion and a discrete fold line in said spout portion and the step of heat sealing said spout portion further includes placing a heat seal between said outer edge and said fold line.
12. The method of claim 9 wherein the step of filling said bag further comprises introducing a dust-prone, lead-based stabilizer compound including at least one compound selected from the group consisting of dibasic lead phthalate, tribasic lead sulfate, dibasic lead phosphite, dibasic lead stearate and normal lead stearate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US35390894A | 1994-12-12 | 1994-12-12 | |
| US353,908 | 1994-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2182983A1 true CA2182983A1 (en) | 1996-06-20 |
Family
ID=23391100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2182983 Abandoned CA2182983A1 (en) | 1994-12-12 | 1995-12-12 | Bag and method for packaging granular compounds |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU4511396A (en) |
| CA (1) | CA2182983A1 (en) |
| WO (1) | WO1996018542A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070806C (en) * | 1996-12-16 | 2001-09-12 | 岸本产业株式会社 | Synthesized-resin film bag with discharging mouth |
| CN107027300A (en) * | 2014-11-27 | 2017-08-08 | 陶氏环球技术有限责任公司 | A kind of packaging formed by sandwich construction |
| CN109703036A (en) * | 2018-12-19 | 2019-05-03 | 常州信泰包装有限公司 | A kind of environment-protection internal lining heat-sealing processing technology |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL84823C (en) * | 1900-01-01 | |||
| US3051605A (en) * | 1958-11-20 | 1962-08-28 | Forrest B Stannard | Method of making valved bags from extruded thermoplastic materials |
| US3646726A (en) * | 1970-03-31 | 1972-03-07 | Reynolds Metals Co | Method of obtaining dry, uncontaminated seals on flexible pouches |
| US5120787A (en) * | 1991-07-05 | 1992-06-09 | J. Drasner & Co., Inc. | Low melt ethylene vinyl acetate copolymer film |
-
1995
- 1995-12-12 AU AU45113/96A patent/AU4511396A/en not_active Abandoned
- 1995-12-12 CA CA 2182983 patent/CA2182983A1/en not_active Abandoned
- 1995-12-12 WO PCT/US1995/015958 patent/WO1996018542A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| AU4511396A (en) | 1996-07-03 |
| WO1996018542A1 (en) | 1996-06-20 |
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