Method For Making Molded Fiber Bottles
a bottle and fiber technology, applied in the field of molded fiber bottles, can solve the problems of damage to the bottle structure, difficulty in forming an adequate bond between the inner wall,
Inactive Publication Date: 2016-05-26
PEPSICO INC
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Benefits of technology
The present invention is about a new method of making molded articles from fibers, such as cellulosic fibers and especially molded bottles from paper pulp. The method involves a first step in which a pulp fiber slurry is applied onto a surface of a papermaking mold and suctioned to create a wet preform. The wet preform is then dewatered. The invention introduces a new approach where a flexible plastic bag is used to press the wet preform against the mold to achieve better dewatering. This method allows for the production of more efficient and better quality molded articles.
Problems solved by technology
One unanticipated problem encountered when using the blow-molding of an injected molded parison to simultaneously dewater the molded pulp bottle and form a barrier layer on the inside of the bottle, was difficulty in forming an adequate bond between the inner wall of the molded pulp bottle and the blow-molded plastic liner.
The shrinkage and separation contributes to distortion of the bottle integration between the plastic liner and fiber wall and may damage the bottle structure.
Method used
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[0020]One shortcoming of the prior approach of blow-molding an injected molded parison to dewater the wet fibrous preform and form a barrier layer in the molded pulp container is that the quantity of plastic used in the method is dictated by limitations associated with making the thermoplastic parison. One of the major goals of developing a molded pulp (paper) bottle is to produce a final product that is more environmentally friendly than current plastic bottles. As a result, one of the subsidiary goals is to limit the plastic component to only that amount of plastic needed to satisfy the functional barrier requirements associated with the potential contents of the bottle. It is preferred that other structural requirements of the bottle be met by the molded pulp. Unfortunately, due to limitations in the blow-molding approach, more than the functionally minimum amount of plastic is unavoidably used in making the final product. Thus, an alternative approach to making a molded pulp bot...
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Abstract
A method for forming a molded fiber bottle by pressurizing a flexible plastic bag in a molded pulp bottle preform to press the bag against the inner wall of the molded pulp bottle preform and thereby assist dewatering of the preform and form an internal plastic liner in the molded pulp bottle preform such that the liner provides a barrier function for the bottle and the resulting bottle produced by the method.
Description
FIELD OF THE INVENTION[0001]This invention relates to a method for making molded fiber articles and particularly a molded fiber bottle. The invention particularly relates to a method in which an internal plastic liner, which serves a barrier function, is introduced as part of the process for molding the article. The invention also relates to the bottle produced by the method.BACKGROUND[0002]It is known to form bottles and other containers by molding a fibrous pulp, such as a cellulosic pulp of the type commonly used to make paper products. Such bottles provide the potential for a significant reduction in the consumption of plastics used for making bottles. Since the pulp-molded bottles can be manufactured using recycled paper, pulp-molded bottles may be more environmentally friendly as well[0003]The prior art has proposed making such pulp molded articles by a method including a papermaking step in which a pulp slurry is fed to the papermaking side of a papermaking mold having a plur...
Claims
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IPC IPC(8): D21J3/10
CPCD21J3/10
Inventor SOCCI, EDWARD PETERYAN, JIEWITHAM, DANIEL LEE
Owner PEPSICO INC