DE2422393A1 - ELASTIC INNER SHOE FOR ORTHOPEDIC FOOTWEAR, SKI BOOTS OR THE SAME AND PROCESS FOR ITS MANUFACTURING - Google Patents

Description

Troisdorf, May 8, 1974 OZ; 74 048 (2337)

DYlTiMIT M) BEL

• Troisdorf, district of Cologne

Elastic inner shoe for orthopedic footwear, ski boots or the like, as well as a method for its preparation

The present invention "relates to an elastic liner for special shoes or boots, e.g. for orthopedics or for sporting purposes, such as ski boots, ski boots, Apres ski boots, slippers or slippers and procedures too its manufacture.

Special shoes of the type mentioned are usually given a lining that is either permanently connected to the outer shoe or is inserted as a separate inner shoe. The latter method in particular is used with good boots or shoes preferably used and results in an optimal adaptation of the foot to the footwear.

Various hitherto have been used for the production of such inner shoes Materials used, such as leather, synthetic leather, textiles, or the like, made with cork masses, polyurethane-Veich foams or the like have been padded. An inner shoe consists of up to 8 individual parts that go through Gluing, welding or sewing together.

609847/0562

the must in order to achieve a shape of the inner shoe that is profiled according to the outer shoe. This manufacturing is therefore Very expensive "in terms of the machines required, the staff and the time. The task was therefore to remedy this deficiency to eliminate.

The present invention overcomes this deficiency by consists of an elastic inner shoe for orthopedic footwear, ski boots or the like, which consists of a There is foam based on polyethylene or polyethylene copolymers, which is preferably partially crosslinked and is predominantly closed-cell. It concerns -sich to high pressure or low pressure polyethylene. As comonomers of Polyethylene are e.g. vinyl esters, vinyl acetate, vinyl ethers, acrylic acid esters, methacrylic acid esters, acrylonitrile or the like suitable. Such additives in an amount of 1 to 15 wt .- ^, preferably 4 to 8 wt .- ^, reduce the compressive strength of the foam.

One method for producing such an inner shoe is, for example, that one is made from flat blanks a foam sheet of the type mentioned by known methods hot by vacuum or pressure stretching against a corresponding one concave or convex shape or by pressing ■ between two molded parts two the vertical middle section of the outer shoe produces corresponding inner shoe halves which after straightening the edges by gluing or

509847/0562

! weld together in a seam-like manner.

. One can also work in such a way that one cross-section

j ring-shaped, tube-like strands made of foams of the named

i th kind in a preferably multi-part blow mold that the

I corresponds to the whole shoe, 'in the warmth to a one-piece

j inflates liner. '

i i

1 On these foam taps. Or their individual .cuts

I can be completely or partially, one or both- ! Laminate side stretchable decorative films, woven fabrics, knitted fabrics, artificial leather or the like in a manner known per se.

509847/0562

- 2422193

example 1

A closed-pore polyethylene foam sheet with a density of 30 kg / m and a thickness of 12 mm, made of high-pressure polyethylene with 1 wt .- ^ dicumyl peroxide as a crosslinking agent, 15.1 wt A proportion of 6% by weight of vinyl acetate to reduce the compressive strength is flame-laminated on both sides with a polyamide knitted fabric (trade name nylon) with a longitudinal stretch of 70 $, a transverse stretch of 30 $ and a weight of 200 g / m 2. Blanks of the foam web are then clamped in the clamping frame of a vacuum forming machine and, after heating to approx. 130-15O ⁰ C in the IR radiator field, shaped into half-shells with a thickness of 8-12 mm.

Example 2

A cross-linked closed-cell polyethylene foam according to Example 1 is laminated on one side with a polyamide knitted fabric according to Example 1 and on the opposite side with an artificial leather consisting of a PVC line on a knitted fabric with a weight of 360 g / m heated in a convection oven with hot air of 170 ⁰ O for 15 minutes and then shaped in a press with a positive and a lying tool

S098Ü7 / 05B2

_ 5 -

compared to Example 1 the Yorteil that the wall thickness of the standard part to a predetermined level and locally different pressed v / ground.

Example 3

A polyethylene foam according to Example 1 is only locally

ι flame-laminated with an artificial leather according to 'Example 2 and in

j deformed in a press according to Example 2. The partial

; Schierung takes place in such a way that the finished inner shoe half

ί only in the upper, later visible area such a decorative

I slide received.

; Each of the manufacturing processes given in the examples

! One half of an inner shoe is therefore manufactured in each case.

; Overall, therefore, for the production of an inner shoe

; pair of four molding tools required. After straightening

i gen the edges, the so-called trimming, are the respective

matching halves connected to one another. The 7

! Bonding takes place either through adhesion promoters or through

I weld. A particularly suitable welding method is the heating

ί sword welding. Here are the edges to be connected

i of the inner shoe halves by means of a temperature of

j 400 ⁰ C heated sword melted and then with-

: connected to each other.

: The invention is illustrated in more detail by the accompanying drawings

; purifies.

509847/0562

Figure I shows an inner shoe half, which consists of the cross-linked closed-pore polyethylene (2) "which is laminated on the outside and inside with the stretchable films, woven or knitted fabrics (1) and (3).

Figure II shows an inner shoe of crosslinked geschlossenpo- \ polyethylene foam ring (4) with a decorative film of the locally! (5) is laminated. With (6) is the. Weld seam and with (7) ι a cover strip, for example made of synthetic leather, denotes.

509847/0562

Claims (4)

_ 7 -
Claims (i7) Elastic liner for orthopedic shoes, ski boots or the like made of a foam on the basis of polyethylene or Polyäthylenmischpol3 ^r -r merisaten which is consisting preferably partially cross-linked and predominantly closed-cell. ; 2. Process for the production of an inner shoe according to claim 1, characterized in that flat blanks are made from a foam web of the type mentioned by known methods hot by vacuum or pressure stretching against a corresponding concave or convex shape or by pressing between two IOrmteile two the vertical center section of the outer shoe corresponding Irmenschuhhälften which are connected to one another in rows after straightening the edges by gluing or welding. 3. A method for producing an inner shoe according to claim 1, characterized in that, in cross section, tubular, tubular strands made of foams of the type mentioned in a preferably multi-part blow mold, which corresponds to the entire shoe, in the heat to a one-piece Liner inflates. 4. The method according to claim 2 and 3, characterized in that 509847/0562 that one on the foam sheet or the individual blanks fully or partially, on one or both sides stretchable decorative films, fabrics, knitted fabrics, artificial leather or the like welded on in a manner known per se. Dr Mi / Be 509847/0562