NO133947B - - Google Patents

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Publication number
NO133947B
NO133947B NO3652/69A NO365269A NO133947B NO 133947 B NO133947 B NO 133947B NO 3652/69 A NO3652/69 A NO 3652/69A NO 365269 A NO365269 A NO 365269A NO 133947 B NO133947 B NO 133947B
Authority
NO
Norway
Prior art keywords
salt
triacetamide
nitrile
added
stated
Prior art date
Application number
NO3652/69A
Other languages
Norwegian (no)
Other versions
NO133947C (en
Inventor
A Seidel
T Moeller
H Weldle
Original Assignee
Heckler & Koch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heckler & Koch Gmbh filed Critical Heckler & Koch Gmbh
Publication of NO133947B publication Critical patent/NO133947B/no
Publication of NO133947C publication Critical patent/NO133947C/no

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00Breech mechanisms, e.g. locks
    • F41A3/64Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78Bolt buffer or recuperator means
    • F41A3/82Coil spring buffers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/25Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins
    • F41A19/27Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
    • F41A19/29Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension
    • F41A19/30Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in bolt-action guns
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/25Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins
    • F41A19/27Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
    • F41A19/29Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension
    • F41A19/30Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in bolt-action guns
    • F41A19/33Arrangements for the selection of automatic or semi-automatic fire
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00Breech mechanisms, e.g. locks
    • F41A3/64Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/66Breech housings or frames; Receivers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00Breech mechanisms, e.g. locks
    • F41A3/64Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78Bolt buffer or recuperator means
    • F41A3/82Coil spring buffers
    • F41A3/86Coil spring buffers mounted under or above the barrel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00Breech mechanisms, e.g. locks
    • F41A3/64Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78Bolt buffer or recuperator means
    • F41A3/82Coil spring buffers
    • F41A3/88Coil spring buffers mounted around the barrel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41CSMALLARMS, e.g. PISTOLS, RIFLES; ACCESSORIES THEREFOR
    • F41C23/00Butts; Butt plates; Stocks
    • F41C23/10Stocks or grips for pistols, e.g. revolvers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41CSMALLARMS, e.g. PISTOLS, RIFLES; ACCESSORIES THEREFOR
    • F41C23/00Butts; Butt plates; Stocks
    • F41C23/12Auxiliary stocks for stabilising, or for transforming pistols, e.g. revolvers, into shoulder-fired guns

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Toys (AREA)
  • Seasonings (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Coating Apparatus (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Description

Fremgangsmåte for å redusere koksalts (uatriumklorids) Procedure for reducing common salt (non-sodium chloride)

tendens til sammenbaking. tendency to caking.

Foreliggende oppfinnelse vedrører en The present invention relates to a

fremgangsmåte for behandling av koksalt (natriumklorid) for å redusere dets tendens til å sammenbake og oppfinnelsen tilveiebringer også en fobedret form av koksalt som har liten eller ingen tendens til sammenbaking. method for treating common salt (sodium chloride) to reduce its tendency to caking and the invention also provides an improved form of common salt which has little or no tendency to caking.

Det er alminnelig kjent at koksalt har It is common knowledge that table salt has

en tendens til å sammenbake når det lag-res, og denne sammenbaking økes ofte av den tendens til gjentatt krystallisering som forekommer, hvis salt utsettes for vekslen-de høye og lave atmosfæriske fuktighets-forhold. a tendency to caking when stored, and this caking is often increased by the tendency to repeated crystallization which occurs if salt is exposed to alternating high and low atmospheric moisture conditions.

Et stort antall av fremgangsmåter er A large number of procedures are

blitt foreslått for å motvirke denne sammenbakingstendens og blant de mange materialer som anvendes ved disse fremgangsmåter, er vann-absorberende forbindelser, som påføres eller blandes med saltkornene eller krystallene. Slike vannabsorberende forbindelser kan være oppløselige eller uoppløselige. De vannoppløselige materialer, som f. eks. kalsiumklorid har en tendens til å gjøre saltet fuktig og klebrig. De vannuoppløselige forbindelser, som svakt have been proposed to counteract this caking tendency and among the many materials used in these processes are water-absorbing compounds which are applied or mixed with the salt grains or crystals. Such water-absorbing compounds may be soluble or insoluble. The water-soluble materials, such as e.g. calcium chloride tends to make the salt moist and sticky. The water-insoluble compounds, which weakly

basisk magnesiumcarbonat, gir uklare opp-løsninger når saltet oppløses i vann. Andre fremgangsmåter som har til oppgave å til-veiebringe en ugjennnomtrengelig film på saltkrystallene, f. eks. slike som omfatter bruken av aluminiumstearat og forskjellige oljer, er beheftet med den ulempen at de medfører reduserte oppløsningshastigheter for saltet med herav følgende nedsettelse av saltsmaken av krystallene. basic magnesium carbonate, gives cloudy solutions when the salt dissolves in water. Other methods which have the task of providing an impermeable film on the salt crystals, e.g. such as include the use of aluminum stearate and various oils, are affected by the disadvantage that they entail reduced dissolution rates for the salt with the consequent reduction in the salty taste of the crystals.

Ved alle de fremgangsmåter som an-vender de foran nevnte materialer, kreves det videre en forholdsvis stor mengde av materiale i forhold til mengden av salt som behandles for å kunne motvirke saltets sammenbakingstendens. In all the methods that use the above-mentioned materials, a relatively large amount of material is also required in relation to the amount of salt being treated in order to counteract the salt's tendency to stick together.

Det er også blitt anvendt ved fremstilling av salt med redusert sammenbakingstendens forbindelser som inneholder kom-plekse ioner f. eks. kaliumferrocyanid. Slike forbindelser kan anvendes effektivt ved lave konsentrasjoner, idet de kan reagere under svakt sure forhold med oppløselige jernsalter så at det dannes sterkt fargete uoppløselige forbindelser, f. eks. prøyssisk blått. Selv ved de lave konsentrasjoner som anvendes, kan dette medføre at det fåes et farget salt som er uønsket for mange øye-med. It has also been used in the production of salt with a reduced caking tendency of compounds containing complex ions, e.g. potassium ferrocyanide. Such compounds can be used effectively at low concentrations, as they can react under slightly acidic conditions with soluble iron salts so that strongly colored insoluble compounds are formed, e.g. Prussian blue. Even at the low concentrations used, this can result in a colored salt being obtained which is undesirable for many eyes.

Det har nu vist seg at sammenbakings-tendensen til natriumklorid kan reduseres betraktelig ved en fremgangsmåte i hen-hold til foreliggende oppfinnelse som be-står i at det til det faste salt tilsettes nitriltriacetamid med formelen N(CH2CONH2).i. It has now been shown that the caking tendency of sodium chloride can be considerably reduced by a method according to the present invention which consists in adding nitrile triacetamide of the formula N(CH2CONH2).i to the solid salt.

Den foretrukne mengde av nitriltriacetamid som anvendes, er mellom 0,05 og 0,0001 vektsprosent av det faste nartium-klorid. Nitriltriacetamid kan også anvendes i forbindelse med kjente anti-bakningstil-setninger. The preferred amount of nitrile triacetamide used is between 0.05 and 0.0001 weight percent of the solid nartium chloride. Nitrile triacetamide can also be used in connection with known anti-caking additives.

Foreliggende oppfinnelse tilveiebringer i overensstemmelse med det anførte en forbedret form for koksalt som har liten eller ingen tendens til sammenbaking og som inneholder nitriltriacetamid som for-trinnsvis er godt dispergert i hele massen av saltkrystaller. The present invention provides, in accordance with the above, an improved form of table salt which has little or no tendency to caking and which contains nitrile triacetamide which is preferably well dispersed throughout the mass of salt crystals.

Nitriltriacetamidet kan tilsettes til saltet på en hvilken som helst hensiktsmessig måte, skjønt det er fordelaktig å sikre at fordelingen er så jevn som mulig i.hele salt-massen. Da forbindelsen er lett oppløselig i vann, kan den utsprøytes i form av en fortynnet oppløsning på det tørre faste salt. Det kan også tilsettes til fuktig salt etter fraskillelse fra moderluten eller en oppløsning av den kan blandes med sus-pensjonen av fast natriumklorid i dets mo-derlut under saltfremstillingsprosessen. The nitrile triacetamide can be added to the salt in any suitable manner, although it is advantageous to ensure that the distribution is as uniform as possible throughout the salt mass. As the compound is easily soluble in water, it can be sprayed in the form of a dilute solution onto the dry solid salt. It can also be added to moist salt after separation from the mother liquor or a solution of it can be mixed with the suspension of solid sodium chloride in its mother liquor during the salt making process.

Den ønskete mengde av tilsetnings-midlet som skal brukes beror på kornstør-relsen og følgelig overflatearealet av saltkrystallene som skal behandles. Den foretrukne konsentrasjon for vanlig inndam-pet finsalt av en partikkelstørrelse av ca. 0,3 mm er 0,001 vektsprosent. The desired quantity of the additive to be used depends on the grain size and consequently the surface area of the salt crystals to be treated. The preferred concentration for ordinary evaporated fine salt of a particle size of approx. 0.3 mm is 0.001% by weight.

Foreliggende oppfinnelse tilveiebringer et produkt og en fremgangsmåte for dets fremstilling som oppviser den fordel at det fåes en varig motvirkning av sammenba-kingstendensen under bruk av en stabil ikke-ionisk forbindelse ved ekstremt lave konsentrasjoner som ikke medfører noen fargning av saltet, når dette utsettes for visse av de lagringsforhold som ofte forekommer. Ytterligere fordeler er at den til-satte forbindelse er oppløselig slik at det behandlete salt gir en klar oppløsning og forurensningen av saltet er ubetydelig da mengden av det anvendte tilsetningsmid-del er meget liten. The present invention provides a product and a method for its production which exhibits the advantage that a permanent counteraction of the caking tendency is obtained using a stable non-ionic compound at extremely low concentrations which does not cause any coloring of the salt, when it is exposed to certain of the storage conditions that often occur. Further advantages are that the added compound is soluble so that the treated salt gives a clear solution and the contamination of the salt is negligible as the amount of the additive used is very small.

Eksempel 1: Tørt knust stensalt med en partikkel-størrelse av ca. 2,5 mm ble påsprøytet en fortynnet oppløsning av nitriltriacetamid i vann for å gi et materiale som inneholdt 1,5 % fuktighet og 0,001 % nitriltriacetamid basert på vekten av saltet. Man lot saltet få henligge utsatt for luften uten-dørs i en uke, sammen med en prøve behandlet med lignende mengde fuktighet, men uten noe nitriltriacetamid. Det be-handlede salt sammenbakte ikke, mens det ubehandlede salt ble utsatt for en hård sammenbaking. Eksempel 2: 50 tonn vakuumsalt ble etter fraskillelse fra moderluten på et filter, men som fremdeles inneholdt 4 % saltoppløsning, påsprøytet med 0,45 kg nitriltriacetamid oppløst i 45 kg vann og saltet ble derpå tørket i en varmluftstørker. Saltet som man fikk fra denne behandling, sammenbakte ikke når det ble lagret under forskjellige ugunstige atmosfæriske forhold. En lignende saltcharge som ble behandlet på samme måte, men som ikke var behandlet med nitriltriacetamid, ga et salt som, når det ble lagret under de samme forhoid, gikk over til hårde klumper. Example 1: Dry crushed rock salt with a particle size of approx. 2.5 mm was sprayed with a dilute solution of nitrile triacetamide in water to give a material containing 1.5% moisture and 0.001% nitrile triacetamide based on the weight of the salt. The salt was left exposed to the air outdoors for a week, along with a sample treated with a similar amount of moisture but without any nitrile triacetamide. The treated salt did not stick, while the untreated salt was exposed to a hard stick. Example 2: 50 tonnes of vacuum salt were, after separation from the mother liquor on a filter, but which still contained 4% salt solution, sprayed with 0.45 kg of nitrile triacetamide dissolved in 45 kg of water and the salt was then dried in a hot air dryer. The salt obtained from this treatment did not cake when stored under various adverse atmospheric conditions. A similar charge of salt treated in the same manner but not treated with nitrile triacetamide gave a salt which, when stored under the same conditions, turned into hard lumps.

Claims (7)

1. Fremgansmåte for å redusere koksalts (natriumklorids) tendens til å sammenbake, karakterisert ved at det faste salt tilsettes nitriltriacetamid av formelen N(CH2CONH2)s.1. Process for reducing the tendency of table salt (sodium chloride) to cake together, characterized in that nitrile triacetamide of the formula N(CH2CONH2)s is added to the solid salt. 2. Fremgangsmåte som angitt i på-stand 1, karakterisert ved at nitriltriacetamidet tilsettes til det tørre faste salt.2. Process as stated in claim 1, characterized in that the nitrile triacetamide is added to the dry solid salt. 3. Fremgangsmåte som angitt, i på-stand 1, karakterisert ved at nitriltriacetamidet tilsettes til det fuktige filtrerte salt.3. Method as indicated, in claim 1, characterized in that the nitrile triacetamide is added to the moist filtered salt. 4. Fremgangsmåte som angitt i på-stand 1, karakterisert ved at nitriltriacetamidet tilsetes til det faste natriumklorid mens dette er suspendert i moderluten.4. Method as stated in claim 1, characterized in that the nitrile triacetamide is added to the solid sodium chloride while this is suspended in the mother liquor. 5. Fremgangsmåte som angitt i en av påstandene 1 til 4, karakterisert ved at nitriltriacetamidet tilsettes i oppløst tilstand.5. Method as stated in one of claims 1 to 4, characterized in that the nitrile triacetamide is added in a dissolved state. 6. Fremgangsmåte som angitt i på-stand 5, karakterisert ved at nitriltriacetamidet påsprøytes i en atomisert tilstand på det faste salt.6. Method as stated in claim 5, characterized in that the nitrile triacetamide is sprayed on the solid salt in an atomized state. 7. Fremgangsmåte som angitt i en av de foregående påstander, karakterisert ved at det faste salt tilsettes fra 0,05 til 0,0001 vektsprosent nitriltriacetamid.7. Method as stated in one of the preceding claims, characterized in that the solid salt is added from 0.05 to 0.0001% by weight of nitrile triacetamide.
NO3652/69A 1968-09-18 1969-09-12 NO133947C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1728251A DE1728251C3 (en) 1968-09-18 1968-09-18 Handle for a self-loading pistol

Publications (2)

Publication Number Publication Date
NO133947B true NO133947B (en) 1976-04-12
NO133947C NO133947C (en) 1976-07-21

Family

ID=5690355

Family Applications (1)

Application Number Title Priority Date Filing Date
NO3652/69A NO133947C (en) 1968-09-18 1969-09-12

Country Status (11)

Country Link
US (1) US3696706A (en)
AT (1) AT298300B (en)
BE (1) BE739038A (en)
CH (2) CH494385A (en)
DE (1) DE1728251C3 (en)
ES (1) ES371599A1 (en)
FR (1) FR2018331A1 (en)
GB (1) GB1279825A (en)
IL (1) IL33020A (en)
NO (1) NO133947C (en)
SE (1) SE373434B (en)

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IT960068B (en) * 1972-06-30 1973-11-20 Tanfoglio G AUTOMATIC GUN IMPROVEMENTS
CH594225A5 (en) * 1974-08-06 1977-12-30 Izhev Mekh Z
US5060555A (en) * 1990-03-30 1991-10-29 Smith & Wesson Corp. Slide decelerator for a firearm
DE4109777A1 (en) * 1991-03-25 1992-10-01 Heckler & Koch Gmbh DEVICE FOR STOREY ACCELERATION OF OBJECTS, IN PARTICULAR LOCKED SELF-LOADING FIREARMS
DE4341131C1 (en) * 1993-12-02 1995-02-02 Heckler & Koch Gmbh Firearm with recoil absorption, in particular a hand gun
US5655326A (en) * 1995-05-25 1997-08-12 Levavi; Israel Method of deploying a weapon utilizing the "Glock system" which provides maximum safety and readiness
US5640794A (en) * 1995-07-07 1997-06-24 Fn Manufacturing, Inc. Fire control mechanism for an automatic pistol
US5678342A (en) * 1995-07-12 1997-10-21 Felk; Edward Karl Automatic piston firing mechanism
US5717156A (en) * 1996-02-12 1998-02-10 Smith & Wesson Corp. Semi-automatic pistol
US5722195A (en) * 1997-03-10 1998-03-03 Bentley; James K. Pistol grip recoil system for the receiver of a firearm
US6401379B1 (en) * 2000-11-28 2002-06-11 Kook-Jin Moon Handgun having a polymer frame
US6862829B2 (en) * 2001-01-05 2005-03-08 Mcmoore William A. Tactile trigger finger safety cue for firearm or other trigger-activated device
US7694449B1 (en) 2004-02-25 2010-04-13 Pontillo Ii James V Plastic pistols
US7216450B2 (en) * 2005-10-17 2007-05-15 Dov Pikielny Frame assembly of handgun with different hardnesses
US7305980B2 (en) * 2006-02-01 2007-12-11 Guay Guay Trading Co., Ltd. Gear box structure for a toy gun
EP2525186A4 (en) * 2010-01-15 2015-05-13 Forjas Taurus Sa Functional and autonomous metallic structure for firearms, and resulting composite, metal-plastic revolver
US20140075803A1 (en) * 2011-07-22 2014-03-20 Bjorn Muller Apparatus, system, and method for a firearm conversion kit
AT515524B1 (en) * 2014-06-26 2015-10-15 Henning Conle Handgun
EA031014B1 (en) * 2014-09-15 2018-11-30 Михаил Елизарович Довгань Auxiliary mechanism for fire arms
US9791247B2 (en) 2015-05-12 2017-10-17 Cgs Group Llc Firing device
US11959718B2 (en) * 2021-04-16 2024-04-16 Kyntec Corporation Hydraulic recoil device for handgun applications

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US26872A (en) * 1860-01-17 Improvement in rope-making machines
US1449566A (en) * 1921-04-21 1923-03-27 Walther Fritz Automatic pistol
US2522192A (en) * 1948-07-06 1950-09-12 Percy L Porter Recoil reducer
US2832266A (en) * 1952-11-08 1958-04-29 Sunderland Oswald Olds Automatic pistol
US3027811A (en) * 1958-04-29 1962-04-03 Remington Arms Co Inc Fire control mechanism for reciprocating bolt firearms
US3206885A (en) * 1963-10-01 1965-09-21 Dye Garnett Jethro Firearm with metal bearing member and plastic material between receiver and stock
DE1271598B (en) * 1964-10-29 1968-06-27 Rheinmetall Gmbh Automatic weapon assembled from assemblies
DE1283707B (en) * 1964-12-19 1968-11-21 Rheinmetall Gmbh Automatic firearm
US3512290A (en) * 1968-07-08 1970-05-19 High Standard Mfg Corp The Firearm housing assembly having three sections and an interlocking central coupling member therefor

Also Published As

Publication number Publication date
AT298300B (en) 1972-04-25
US3696706A (en) 1972-10-10
IL33020A0 (en) 1970-10-30
BE739038A (en) 1970-03-02
IL33020A (en) 1973-02-28
FR2018331A1 (en) 1970-05-29
GB1279825A (en) 1972-06-28
ES371599A1 (en) 1971-10-16
DE1728251B2 (en) 1975-02-20
SE373434B (en) 1975-02-03
CH494385A (en) 1970-07-31
DE1728251C3 (en) 1975-10-02
CH494384A (en) 1970-07-31
NO133947C (en) 1976-07-21
DE1728251A1 (en) 1972-04-06

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