Composite method of biaxially stretched polypropylene film and co-extruded polyethylene film
A polypropylene film, co-extruded polyethylene technology, applied in the direction of polyurea/polyurethane adhesives, chemical instruments and methods, adhesive types, etc., can solve the composite tensile force of biaxially oriented polypropylene film and co-extruded polyethylene film Small and other problems to achieve the effect of meeting packaging requirements and high reliability
Active Publication Date: 2017-06-27
鹤山市正达复合包装有限公司
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Problems solved by technology
[0014] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a method for compounding biaxially stretched polypropylene film and co-extruded polyethylene film, which solves the problem of low composite tension of existing biaxially stretched polypropylene film and co-extruded polyethylene film question
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[0041] Table 4
[0042]
[0043] Compared with the prior art, the temperature of each oven in the present invention is reduced, and the curing temperature is also reduced accordingly, which can save energy. The present invention has the following advantages:
[0044] 1. The surface tension of the biaxially oriented polypropylene film of the present invention reaches more than 40 dynes. After the structure is compounded, the initial adhesion of the compound will be improved, and the decline of the surface tension will be reduced.
[0045] 2. Compared with the prior art, the oven temperature and oven tension of the present invention are reduced, reducing the shrinkage caused by the stretching deformation of the biaxially stretched polypropylene film, making it easier to control the synchronous stretching and shrinkage of this structure, and avoiding serious displacement , reducing the composite strength formed by this factor is low.
[0046] 3. The gluing pressure roller is ...
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Abstract
The invention provides a composite method of a biaxially stretched polypropylene film and a co-extruded polyethylene film. The method is carried out in the following manner: (1) the biaxially stretched polypropylene film is coated on the first unwinding mechanism, and the upper rubber roller passing through the coating mechanism is coated with two-component solvent-based polyurethane glue, ( 2) The biaxially stretched polypropylene film coated with glue enters the oven to dry and discharge the organic solvent. (3) The co-extruded polyethylene film is wrapped on the second unwinding mechanism, and the second unwinding mechanism will work to release the co-extruded polyethylene film. The biaxially oriented polypropylene film processed in step (2) is gathered on the composite drying mechanism, so that the two-component solvent-based polyurethane glue is bonded to the co-extruded polyethylene film, and (4) the product obtained in step (3) is wound up The mechanism is put away, and (5) the product rewound in step (4) is put into a constant temperature curing chamber. The peeling strength of the product obtained by the invention is greater than 0.8N / 15mm, the reliability is higher, and the packaging requirement is met.
Description
technical field [0001] The invention relates to a packaging film processing method, in particular to a composite method of a biaxially stretched polypropylene film and a co-extruded polyethylene film. Background technique [0002] According to the requirements of use, the peel strength standard of biaxially oriented polypropylene film and seven-layer co-extruded polyethylene film containing EVOH should reach 0.8N / 15mm or more, while the peel strength of this type of film compounded in the prior art can only reach 0.5N / 15mm or so. The main reasons for the decrease in tension are as follows: [0003] 1. This type of product is cured at a constant temperature after dry compounding, and the polyurethane composite glue between the two layers of film is dried. Since the polyurethane composite glue will only adhere to the seven-layer co-extruded polyethylene film containing EVOH, it will not stick to the two-way pull The side of the polypropylene film is stretched, so the compos...
Claims
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IPC IPC(8): B32B37/12B32B38/16C09J175/04
Inventor 李雄程梁卓均杨裕源
Owner 鹤山市正达复合包装有限公司