Method for compounding two-way stretched polypropylene thin film and co-extruded polyethylene thin film
A technology of polypropylene film and co-extruded polyethylene, applied in polyurea/polyurethane adhesives, chemical instruments and methods, adhesive types, etc., can solve the composite tension of biaxially stretched polypropylene film and co-extruded polyethylene film Small problems, to achieve the effect of meeting packaging requirements and high reliability
Active Publication Date: 2016-01-27
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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The invention provides a method for compounding a two-way stretched polypropylene thin film and a co-extruded polyethylene thin film. The method is carried out according to the following ways: (1) the two-way stretched polypropylene thin film coats a first unreeling mechanism, and then is coated with a two-component solvent-type polyurethane glue through a gluing roller of a coating mechanism; (2) the two-way stretched polypropylene thin film coated with the glue goes into a drying oven and is dried, and an organic solvent is removed; (3) the co-extruded polyethylene thin film coats a second unreeling mechanism, the second unreeling mechanism works to gather the co-extruded polyethylene thin film and the two-way stretched polypropylene thin film after being processed in the step (2) on a compounding drying mechanism, and the two-component solvent-type polyurethane glue and the co-extruded polyethylene thin film are bonded; (4) the product obtained in the step (3) is reeled by a reeling mechanism; and (5) the product reeled in the step (4) is placed in a constant temperature curing chamber. The obtained product has the peel strength greater than 0.8 N / 15 mm, has higher reliability, and meets the requirements of packing.
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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Login to View More 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