US1756993A - Process of making pancake or built-up sheet leather - Google Patents
Process of making pancake or built-up sheet leather Download PDFInfo
- Publication number
- US1756993A US1756993A US33827A US3382725A US1756993A US 1756993 A US1756993 A US 1756993A US 33827 A US33827 A US 33827A US 3382725 A US3382725 A US 3382725A US 1756993 A US1756993 A US 1756993A
- Authority
- US
- United States
- Prior art keywords
- leather
- pancake
- built
- water
- asphalt
- 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.)
- Expired - Lifetime
Links
- 239000010985 leather Substances 0.000 title description 35
- 235000012771 pancakes Nutrition 0.000 title description 21
- 238000000034 method Methods 0.000 title description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 239000010426 asphalt Substances 0.000 description 11
- 239000011230 binding agent Substances 0.000 description 10
- 235000012970 cakes Nutrition 0.000 description 10
- 239000006185 dispersion Substances 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000000839 emulsion Substances 0.000 description 6
- 239000004927 clay Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000021463 dry cake Nutrition 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- DCXXMTOCNZCJGO-UHFFFAOYSA-N Glycerol trioctadecanoate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 description 1
- 208000003251 Pruritus Diseases 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- FYGDTMLNYKFZSV-MRCIVHHJSA-N dextrin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)OC1O[C@@H]1[C@@H](CO)OC(O[C@@H]2[C@H](O[C@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-MRCIVHHJSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- -1 gums Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C11/00—Surface finishing of leather
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
- Y10T156/1092—All laminae planar and face to face
- Y10T156/1093—All laminae planar and face to face with covering of discrete laminae with additional lamina
Definitions
- This invention relates to the manufacture of built-up sheet leather, or pancake so called, which may be employed in the manufacture of counters, heels, slip tops, and inner soles.
- sheet leather is generally. made of scraps or trimmings of thin leather, sometimes called levellings, produced in splitting or skiving. leather to reduce it to a uniform thickness.
- the levellings are usually in sheets, varying in thickness from that of a sheet of paper to of an inch, and may be of any shape.
- These levellings heretofore have been pasted together by flour and dextrine, or starch paste, in a pan or frame, to form a block or cake. The cake was then subjected to pressure, which forces out the greater part of the water, and was hardened by drying.
- the hardened cake is known as built-up or pancake leather.
- the character of the binder employed for pasting the trimmings or levellings together is the character of the binder employed for pasting the trimmings or levellings together.
- the paste should be of a quality to ensure a strong yet flexible counter.
- the usual paste is too dry, and thus brittle, breaks inthe-back and heel flange of the counter may occur; while if the paste is in too wet a condition, a warped and illshaped finished counter will result after the drying operation.
- pancake leather due to the use of binders which lose their binding properties under the action of water, pancake leather has been used only in shoes of the poorest grades, and its wearing qualities were very poor.
- the manufacture of built-up leather of this character has been decreasing.
- the object of this invention is to produce pancake leather which is strong and yet flexible, which not disintegrated when subjectedto the action of water, and which more closely simulates solid leather than the ordinary pancake as heretofore produced. -ject, briefly. stated, is accomplished by em- I ploying as a binder for the leather levellings: 4
- This oba dispersion of'normally adhesive thermoplastic material preferably asphalt
- This dispersion or emulsion may consist of an ad 'hesive binder, such as asphalt, the asphalt being subdivided into minute or colloidal particles, and an emulsifying? agent suchi'as colloidal'clay, the particles of asphalt beingprotected or enveloped by the clay, and a liquid vehicle'or medium, such as water.
- emulsion may bemade by the process described in U. S. Letters Patent No. 1,417,835,. granted May 30, 1922', to Lester Kirsch-- braum.
- a suspension or dispersion is non-adhesive, and may be made in paste or plastic form, so that itis capable of being spread or painted on the surface of material.
- Pancake may be built up with such a binder and'yield a good product, superior to the heretofore commercially known pancake.
- Figure 1 represents more or less conventionally a somewhat enlarged section through a portion of pancake leather just after it has v been made as hereinafter described.
- Figure 2 is a similar view but shows the cake after it has been pressed and surfaceskived to a uniform thickness.
- Figure 3 shows in perspective and more or less conventionally, for purposes of illustration, a counter made with the finished prod-
- the leather stock may, if desir be tempered or softened with water.
- the pancake may then be built in a frame.
- the workman starts by laying a sheet of thin leather that is cut somewhat longer and wider than the frame, and covers it witha coat ,of bituminous emulsion, as by a paintin dipping or spraying operation.
- a layer ot 'the smallr pieces of leather levellings is then distributed evenly over thempanca tire area of the frame, and coats of emulsion and layers ofleather are laid alternately until the desired thickness of cake is obtained,-
- the pressing may then be accomplished by a mechanical or hydraulic press, by means of which heavy pressure may' be applied
- a layer of these pancakes is placed on a steel plate and is covered, if desired, with a sheet of burlap.
- Another steel plate is put on, then another layer of pancakes and burlap, and so on until the press is filled.
- Pressure is applied, and the greater part of the excess water in the cakesis pressed out and the cakes tight-1i compacted.
- the pancake When dry, the pancake is hard and stiff, but
- each blank is usually formed by the whole iece of leather which forms the bottom of t e pancake, and the other,-which is the pieced side, is made up as the inside of the finished counter.
- the blanks may be skived onthe pieced side and waxed on the outside, and then moulded into shape and the heel flange turned, thus completing the entire counter-forming operation, Figure 3 illustrating a counter thus formed.”
- the material may be freely tempered, because there is no tendency of the asphalt binder to be disin-' tegrated by the moisture, and since the as- I no phalt possess a. certain amount'of flexibility,
- the material is not subject to cracking as with the ordinary binders.
- the hardened and dry cake When used for the manufacture of heels, it is cut into 'heel blanks by the usual cutting dies and built up.
- the heel will be waterproof.
- bituminous emulsion as used in Y the appended claims I mean a suspension or dispersion in water of normally adhesive and cohesive bituminous material, preferably asphalti the particles of asphalt being of minute or co by colloidal clay or other equivalent emulsifying or colloidal agent, the suspension or dispersion bein non-adhesive and preferably in a pasty or p astic form, so that it may be spread or painted on a surface. On the elimination of the water and on being subjected to heat and pressure, or both, the asphalt coa lesces and reverts to its normal adhesive and cohesive state.
- thermoplastic material I mean any bituminous or pitchy material, such as natural and blown asphalts, stearin itches, or other equivalent materials, so tenable when heated and possessing waterproofing characteristics; and by the term colloidal or emulsifying agent, I mean hydrophilic colloids, such as colloidal clay, soaps, sodium silicate, glue, gums, starch paste, and the like.
- a process of making built-up or pan cake leather from thin leather which comprises applying a coating of a dispersion of a thermoplastic binder in water to the surfaces of the thin leather and building up a plurality of layers of such coated leather tempered and softened by the water component of said dispersion.
- a process of making built-up or pancake leather from thin leather which comprises applying a coatin or film of bituminous emulsion in non-a hesive form to the surfaces of the thin leather, building up a plurality of layers of such coated leather, applying pressure to the built-up layers, and applying heat to coalesce the bituminous material and to unite the layers.
- a process of making built-u or pancake leather from thin scrap leat er which comprises applying a coating or film of a disloidal size and protected or enveloped.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Description
y 6,1930. c. E. RAHR 1,756,993
PROCESS OF MAKING PANCAKEOR BUILT-UP SHEET LEATHER Filed May 29, 1925 Patented May 6, 1930 UNITED STATES CHESTER E. RAHR, 0F BROOKLINE, MASSACHUSETTS, ASSIGNORTO. THE FLINTKOTE COMPANY OF BOSTON, MASSACHUSETTS, A CORPORATION 01 MASSACHUSETTS raocessor MAKING PANCAKE Application filed May 29,
This invention relates to the manufacture of built-up sheet leather, or pancake so called, which may be employed in the manufacture of counters, heels, slip tops, and inner soles. Such sheet leather is generally. made of scraps or trimmings of thin leather, sometimes called levellings, produced in splitting or skiving. leather to reduce it to a uniform thickness. The levellings are usually in sheets, varying in thickness from that of a sheet of paper to of an inch, and may be of any shape. These levellings heretofore have been pasted together by flour and dextrine, or starch paste, in a pan or frame, to form a block or cake. The cake was then subjected to pressure, which forces out the greater part of the water, and was hardened by drying. The hardened cake is known as built-up or pancake leather.
As-is quite obvious from the brief description given, one of the very important factors entering into the production of pancake of good quality is the character of the binder employed for pasting the trimmings or levellings together. For example, in the manufacture of'counters from pancake, the paste should be of a quality to ensure a strong yet flexible counter. During the moulding of the counter, if the usual paste is too dry, and thus brittle, breaks inthe-back and heel flange of the counter may occur; while if the paste is in too wet a condition, a warped and illshaped finished counter will result after the drying operation. Moreover, due to the use of binders which lose their binding properties under the action of water, pancake leather has been used only in shoes of the poorest grades, and its wearing qualities were very poor. In fact, due to the unsatisfactory characteristics of pancake leather and to the high labor costs in itsmanufacture within recent years, as well as because of the introduction of other and more satisfactory substitutes, the manufacture of built-up leather of this character has been decreasing.
The object of this inventionis to produce pancake leather which is strong and yet flexible, which not disintegrated when subjectedto the action of water, and which more closely simulates solid leather than the ordinary pancake as heretofore produced. -ject, briefly. stated, is accomplished by em- I ploying as a binder for the leather levellings: 4
0R BUILT-UP SHEET LEATHER 1925. Serial No. 38,827.
i This oba dispersion of'normally adhesive thermoplastic material, preferably asphalt This dispersion or emulsion may consist of an ad 'hesive binder, such as asphalt, the asphalt being subdivided into minute or colloidal particles, and an emulsifying? agent suchi'as colloidal'clay, the particles of asphalt beingprotected or enveloped by the clay, and a liquid vehicle'or medium, such as water. The
emulsion may bemade by the process described in U. S. Letters Patent No. 1,417,835,. granted May 30, 1922', to Lester Kirsch-- braum. Such a suspension or dispersion is non-adhesive, and may be made in paste or plastic form, so that itis capable of being spread or painted on the surface of material.
With the elimination of'water by heat or by the action of heat and pressure, the asphalt particles coalescerand revert to their normally adhesive and cohesive state, and on being thereaftersubjected to water remain water:
proof and are not disintegrated. Pancake may be built up with such a binder and'yield a good product, superior to the heretofore commercially known pancake. On the accompanying drawings Figure 1 represents more or less conventionally a somewhat enlarged section through a portion of pancake leather just after it has v been made as hereinafter described.
Figure 2 is a similar view but shows the cake after it has been pressed and surfaceskived to a uniform thickness.
Figure 3 shows in perspective and more or less conventionally, for purposes of illustration, a counter made with the finished prod- Before building pp the cake, the leather stock may, if desir be tempered or softened with water. The pancake may then be built in a frame. The workman starts by laying a sheet of thin leather that is cut somewhat longer and wider than the frame, and covers it witha coat ,of bituminous emulsion, as by a paintin dipping or spraying operation. A layer ot 'the smallr pieces of leather levellings is then distributed evenly over thempanca tire area of the frame, and coats of emulsion and layers ofleather are laid alternately until the desired thickness of cake is obtained,-
The pressing may then be accomplished by a mechanical or hydraulic press, by means of which heavy pressure may' be applied A layer of these pancakes is placed on a steel plate and is covered, if desired, with a sheet of burlap. Another steel plate is put on, then another layer of pancakes and burlap, and so on until the press is filled. Pressure is applied, and the greater part of the excess water in the cakesis pressed out and the cakes tight-1i compacted. The now firm but damp pressure in the press,-as by heating the press, or ma be removed and hung up ina steamheate loft to dry. In either case, with the elimination of water the asphalt particles coalesce and become adhesive, binding the leather levellings together.
When dry, the pancake is hard and stiff, but
there is a certain amount of pliability and flexibility which is imparted to it by the coalesced asphalt particles, and'it is not as brittle as the ordinary pancake as heretofore made. When tempered and softened in water before being worked, as for example, in the production of counters, there is no tendency for the cake to disintegrate after it is in preper tempered condition, even after a prolonged soakin in water. The cake may be reduced to a uniform thickness as shown in Fig. 2, by a surface skiving machine, and may be cut into blanks for counters on a dinking machine. One side of each blank is usually formed by the whole iece of leather which forms the bottom of t e pancake, and the other,-which is the pieced side, is made up as the inside of the finished counter. The blanks may be skived onthe pieced side and waxed on the outside, and then moulded into shape and the heel flange turned, thus completing the entire counter-forming operation, Figure 3 illustrating a counter thus formed." The material may be freely tempered, because there is no tendency of the asphalt binder to be disin-' tegrated by the moisture, and since the as- I no phalt possess a. certain amount'of flexibility,
the material is not subject to cracking as with the ordinary binders. v
When the hardened and dry cake is used for the manufacture of heels, it is cut into 'heel blanks by the usual cutting dies and built up. The heel will be waterproof.
e may then be dried under heat and .It may be stated that by the use of the expression bituminous emulsion, as used in Y the appended claims I mean a suspension or dispersion in water of normally adhesive and cohesive bituminous material, preferably asphalti the particles of asphalt being of minute or co by colloidal clay or other equivalent emulsifying or colloidal agent, the suspension or dispersion bein non-adhesive and preferably in a pasty or p astic form, so that it may be spread or painted on a surface. On the elimination of the water and on being subjected to heat and pressure, or both, the asphalt coa lesces and reverts to its normal adhesive and cohesive state.
By the term thermoplastic material, I mean any bituminous or pitchy material, such as natural and blown asphalts, stearin itches, or other equivalent materials, so tenable when heated and possessing waterproofing characteristics; and by the term colloidal or emulsifying agent, I mean hydrophilic colloids, such as colloidal clay, soaps, sodium silicate, glue, gums, starch paste, and the like.
Having thus described an embodiment of this invention, it should be evident to those skilled in the art that it is susceptible of various changes and modifications without departing from its spirit or scope as defined by the appended claims.
What I claim is:
1. A process of making built-up or pan cake leather from thin leather, which comprises applying a coating of a dispersion of a thermoplastic binder in water to the surfaces of the thin leather and building up a plurality of layers of such coated leather tempered and softened by the water component of said dispersion.
2. A process of making built-up or pancake leather from thin leather, which comprises applying a coatin or film of bituminous emulsion in non-a hesive form to the surfaces of the thin leather, building up a plurality of layers of such coated leather, applying pressure to the built-up layers, and applying heat to coalesce the bituminous material and to unite the layers.
3. A process of making built-u or pancake leather from thin scrap leat er, which comprises applying a coating or film of a disloidal size and protected or enveloped.
person of asphalt in water to the surfaces of l the thin leather, building up a plurality oflayers of such coated leather, and then drycake leather from thin scrap leather, which comprises coating the surfaces of such scrap leather with a dispersion of a thermoplastic v binder containing water in the external phase,
building up a plurality of layers of such'co'ated leather tempered and softened by the water content of said dispersion, and then pressing and heating the built-up layers to remove the water and coalesce the previously dispersed particles of binder.
In testimony whereof I have affixed my signature;
CHESTER E. RAHR.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US33827A US1756993A (en) | 1925-05-29 | 1925-05-29 | Process of making pancake or built-up sheet leather |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US33827A US1756993A (en) | 1925-05-29 | 1925-05-29 | Process of making pancake or built-up sheet leather |
Publications (1)
Publication Number | Publication Date |
---|---|
US1756993A true US1756993A (en) | 1930-05-06 |
Family
ID=21872673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US33827A Expired - Lifetime US1756993A (en) | 1925-05-29 | 1925-05-29 | Process of making pancake or built-up sheet leather |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3141451A (en) * | 1960-09-16 | 1964-07-21 | Richard V Walker | Archer's bow |
EP0104480A2 (en) * | 1982-09-24 | 1984-04-04 | Gerhard Griesser | Image en relief en cuir |
US4497871A (en) * | 1983-04-27 | 1985-02-05 | Henke Edward W | Reconstituted leather and method of manufacturing same |
-
1925
- 1925-05-29 US US33827A patent/US1756993A/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3141451A (en) * | 1960-09-16 | 1964-07-21 | Richard V Walker | Archer's bow |
EP0104480A2 (en) * | 1982-09-24 | 1984-04-04 | Gerhard Griesser | Image en relief en cuir |
EP0104480A3 (en) * | 1982-09-24 | 1985-07-03 | Gerhard Griesser | Image en relief en cuir |
US4497871A (en) * | 1983-04-27 | 1985-02-05 | Henke Edward W | Reconstituted leather and method of manufacturing same |
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