Process for the manufacture of environmentally friendly...

Details Process for the manufacture of environmentally friendly... Process for the manufacture of environmentally friendly...

1998-05-04

2001-08-28

Silbaugh, Jan H. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

C264S129000, C264S173120, C264S173160, C264S151000, C264S291000, C264S564000, C264S569000

Reexamination Certificate

active

06280680

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a process for the manufacture of an environmental friendly paper having up to about 80% by weight of inorganic mineral powders. More particularly, the present invention relates to a process for the manufacture of a paper having two dimensional strength by using a combination of at least of one extruder and a forming mould having an a circular die. The present invention also relates to a composition for the manufacture of an environmental friendly paper comprising up to about 80% weight of inorganic mineral powders.
BACKGROUND OF THE INVENTION
Numerous synthetic papers have been developed. Papers of single and multiple layers having polypropylene as a main component and inorganic mineral powders as fillers are produced from formulations of conventional plastic films. Papers are coextruded as a single layer or multiple layers during the process, and are formed as a sheet through a forming mould having a direct-line gate. After being stretched in a longitudinal direction, the sheet is laminated by other sheets on its two sides, and then it is stretched in latitudinal direction. The resulting multiple-layered paper has a middle layer which has been stretched in two directions and two surface layers which have only been stretched in one direction. If the sheet which has been stretched in a longitudinal direction is subjected to the stretch in a latitudinal direction, the resulting paper with a single layer or multiple layers possesses two dimensional stretched properties at its surface. Although advantages can be found in the above papers made from polypropylene, they are still inferior to the papers made from pulp. The drawbacks of the papers made from polypropylene include bad foldability, great differences between latitudinal and longitudinal tearing strength, or no tearing ability, etc. In addition, the papers made from polypropylene will not quickly decompose in a natural environment. Furthermore, the production cost of synthetic papers is much higher than that of pulp papers. In view of the above drawbacks, synthetic papers do not fully comply with the needs of consumers.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a process for the manufacture of an environmental friendly paper, in which the paper comprises up to about 80% by weight of inorganic mineral powders as main components, about 43% to 18% by weight of polyethylene, and less than 2% by weight of additives.
Another object of the invention is to provide a process for the manufacture of an environmental friendly paper, in which a combination of at least one extruder and a forming mould having an a circular die is used to extrude the components as an circular film tube and the circular film tube is inflated so that the film is stretched in two dimensional direction simultaneously.
Yet another object of the invention is to provide a process for the manufacture of an environmental friendly paper, in which the density of the paper is reduced from about 2 g/cm
3
of the combination of the raw materials to as low as about 0.5 g/cm
3
, saving an amount of up to 40% volume when compared with the density of pulp of about 0.7 g/cm
3
to about 0.9 g/Cm
3
.
Yet another object of the present invention is to provide a process for the manufacture of an environmental friendly paper, in which the paper posseses similar properties as those of pulp paper, such as foldability, stiffness, opaqueness, writing ability, and latitudinal and longitudinal tearing strength.
Yet another object of the present invention is to provide a process for the manufacture of an environmental friendly paper, in which neither toxic gas nor smoke is produced when the paper produced is burned because only a minor amount of high density polyethylene is burned, and the paper produced is recyclable.
Yet another object of the present invention is to provide a process for the manufacture of an environmental friendly paper, in which a single-layered paper produced will decompose in a natural environment.
The above features and advantages of the present invention will be better understood with reference to the accompanying figures, detailed description and examples. It should also be understood that the particular environmental friendly paper illustrating the present invention is exemplary only and not to be regarded as a limitation of the invention.


REFERENCES:
patent: 3758661 (1973-09-01), Yamamoto et al.
patent: 3775521 (1973-11-01), Yamamoto et al.
patent: 3855056 (1974-12-01), Maeda et al.
patent: 3903234 (1975-09-01), Ikeda et al.
patent: 4011128 (1977-03-01), Suzuki
patent: 4082880 (1978-04-01), Zboril
patent: 4095012 (1978-06-01), Schirmer
patent: 4219453 (1980-08-01), Sakurai et al.
patent: 4318950 (1982-03-01), Takashi et al.
patent: 4340639 (1982-07-01), Toyoda et al.
patent: 4359497 (1982-11-01), Magder et al.
patent: 4705813 (1987-11-01), Ito et al.
patent: 5254617 (1993-10-01), Inoue et al.
patent: 5552011 (1996-09-01), Lin
patent: 5582670 (1996-12-01), Andersen et al.
patent: 5759675 (1998-06-01), Hamada et al.
patent: 0 111 287 (1984-06-01), None
patent: 57-22008 (1982-05-01), None
patent: 61-273941 (1983-05-01), None
patent: 62-53345 (1987-03-01), None
patent: 7-308970 (1995-11-01), None
patent: 78106420 (1991-03-01), None
patent: 80105230 (1992-09-01), None
patent: 82100878 (1995-04-01), None
patent: 83108984 (1997-05-01), None
patent: 84101407 (1997-07-01), None
No. 60-215034A, 10-28-1985, Abstract of published Japanese application.
No. 56-118437A, 09-17-1981, Abstract of published Japanese application.
No. 05-050522A, 03-02-1993, Abstract of published Japanese application.
No. 05-032798A, 02-09-1993, Abstract of published Japanese application.
No. 59-068212A, 04-18-1984, Abstract of published Japanese application.
No. 01-156061A, 06-19-1989, Abstract of published Japanese application.
No. 61-248793A, 11-06-1986, Abstract of published Japanese application.
Handbook of Manufacture of Plastic Products, Beijing Chemical Industry Company, 1995, (first printing 1991), pp. 110-125, 142, 143.

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