Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1994-06-20
1995-11-14
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156324, 156291, 162112, 162280, 264282, B31F 112, B32B 714
Patent
active
054663180
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for manufacturing a fabric-like laminate preferably made of wet-strength-treated tissue paper and a product manufactured according to said method.
2. Description of the Related Art
It is previously known to manufacture a fabric-like material, of paper, in which a plastisol is used as a binder, and quality supplying additional material to laminate two or more layers of tissue paper, the material being suitable for manufacturing table-cloths, having the desired qualities as heaviness, drape, softness and tensile strength. An important reason in using a plastisol is the fact that it is not water-based, whereby those problems are avoided which otherwise are associated with a strong wetting of tissue paper webs.
There is now an interest for environmental reasons to develop alternative laminates manufactured by the aid of water-based binders also having the above-mentioned qualities, such as heaviness, drape, softness and tensile strength.
However, during the development work problems have arisen with respect to the manufacture of well-functioning laminates when water-based binders are used for laminating creped tissue paper, and the manufacturing problems have been enormous. The wetting of the paper has led to softening, swelling and defects in the creping, which in turn has resulted in difficulties with inter alia the guidance of the webs. The finished laminate obtained has had disqualifying stiffness, which has not met the requirements determined concerning drape and softness.
SUMMARY OF THE INVENTION
According to the present invention these drawbacks are eliminated, making it possible to manufacture a product having--for the most part--quality properties corresponding to the products previously known, but which in turn is much cheaper and simpler to manufacture and which, moreover, is better with respect to the environment. The characterizing features of the present invention are stated in the enclosed claims.
Since tissue paper used for manufacturing laminate for table-cloths is negatively affected by strong wetting, the development work has been directed to eliminating the negative effects which can arise in coating of water-based adhesives.
One way to eliminate the problems is to avoid the disturbing effects of wetting even with respect to thin webs.
By the aid of the development work, this condition has now been possible to achieve by certain essential measures according to the invention, which on one hand per se and on the other hand taken together give the desired result.
Partial coating in patterns of preferably lines is one possibility, which can be used in order to attain good functional binding between tissue paper layers without the partial wetting giving injurious influence, since the paper web for the most part remains uninfluenced by the moisture.
The pattern application occurs preferably in a square pattern created by spaced lines, the lines forming for example quadratic or hexagonal shapes.
When the square-line pattern is placed having the "head lines" aligned diagonally over the web, the smallest possible negative wetting effect is obtained, since the creping only constitutes transverse creped folds.
The width of the lines and the size of the squares are adapted to the quality of the tissue paper, apparatus construction, type of adhesive and working conditions in relation to product requirements.
A pattern application as described above is especially suitable for laminating of two tissue paper webs in a first step, as the requirement of the laminate after drying is the fact that it shall be a strong enough to be "stabilizer" in the following laminating to another tissue paper web. This finished laminate consists, in other words, of three layers of tissue paper.
In another embodiment the pattern is made by lines, which mainly extend along the web, especially as lines parallel to the web. The pattern application thus made in the form of longitudinal lines provides the largest possible tensile st
REFERENCES:
patent: 2014460 (1935-09-01), Alm
patent: 3044896 (1962-07-01), Warner
patent: 3672949 (1972-06-01), Brown
patent: 5143776 (1992-09-01), Givens
Ball Michael W.
Duni AB
Yao Sam Chuan
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