手糊成型工艺 中英文对照

Polymer Processing

Molding Papers

Hand lay-up process

1.

Brief introduction

Hand Lay- up process is also called contact molding, which job is to turn of the glass

fiber fabric and resin in the mold shop, and then solidified forming process for glass

fiber reinforced plastic products. In China, hand lay-up process occupied about 80%

of all thermosetting resin matrixes composite molding process in the gross domestic,

which

is

used

the

earliest

and

most

widely,

as

a

molding

method,

in

thermosetting

resin matrix composite material molding.

2.

Process Description

(1) Production Preparation

construction

site:

the

size

of

the

workplace

should

be

based

on

product

size

and

output decisions, the site demands clean, dry and well ventilated, the air temperature

should

be

maintained

at

between

15

~

35

℃

,

after

processing,

renovated

section

should include a dust extraction and sprinklers.

Mold

preparation:

preparation

work

including

cleaning,

assembling

and

coating

release, etc.

Resin glue make-up:

we should pay attention to two problems:

①

The glue should prevent air bubbles in the mix;

②

Assigned glue amount can not be too much, each amount should ensure it become

the resin gel before running out.

Enhanced

material

preparation:

to

enhance

the

types

of

materials,

the

choice

should relate to the requirements and specifications.

(2)

Paste making and solidification

There

are

two

kinds

of

hand-laminated

paste

making,

namely

wet

and

dry.

Dry

stacking

is

to

use

pre-preg

cloth

as

raw

material,

a

good

first

material

(fabric)

by

sample

cut

into

a

bad

material,

layer

softens

when

heated,

and

then

level

by

level,

close

to

the

mold,

and to

rule

out

interlayer

bubbles,

so

that

dense.

This

method

is

used for pressing cans and bags of pressure molding.

Shop wet layer is directly

put reinforced material cord in the mold, close to the die

level

by

level,

the

less

bubbles,

to

make

it

dense.

Hand

lay-up

method

has

been

applied

more

generally

craft

shop

floor.

Shop

floor

wet

gel

coat

layer

is

further

divided into the system and structure of the layer of paste paste system.

In

addition,

the

hand

lay-up

tool

to

ensure

product

quality

greatly.

Generally

have

wool roller, roller bristles, spiral rollers, and electric saws, electric drills, grinding and

polishing machines.

Products

cured

sub-hardening

and

maturation

in

two

stages.

Triangulation

from

the

gel to a general 24h, at this time curing degree of 50% to 70% (Barcol hard degree 15),

may be stripping, de-cured under natural environmental conditions after 1 to 2 weeks

in

order

to

make

products

with

the

mechanics

strength,

said

the

aging

of

its

curing

degree of 85% or more. Heating can promote the ripening process, pairs of glass fiber

reinforced

polyester,

80

℃

heating

3h,

pairs

of

glass

fiber

reinforced

epoxy

after

curing

temperature

can

be

controlled

at

150

℃

or

less.

Heat

curing

many

ways,

small and medium products can be heated during the curing oven curing, large-scale

products can be used in-mold heating or infrared heating.

(3)

Stripping and finishing

Stripping

is

designed

to

ensure

products

free

from

injury.

Stripping

method

has

the

following several kinds:

①

the die on top of a stripping ejector embedded devices, stripping when the rotating

screw, the product ejection.

②

pressure

ejection

of

compressed

air

or

water,

leaving

mold

on

the

entrance,

stripping

will

be

compressed

air

or

water

(0.2MPa)

between

the

pressure

into

the

molds

and

products,

while

wood

hammer

and

rubber

hammer

to

fight,

so

that

separation of products and molds.

③

large-scale products (such as boats) stripping can take advantage of jacks, cranes

and hard wedge tools.

④

complex

products

can

be

used

hand-stripping

method

first

paste

in

the

mold

system of two three-story glass fiber reinforced plastic, can wait until the cured peel

from

the

mold,

and

then

continue

to

paste

the

system

on

the

mold

to

the

design

thickness, cured easily from the mold off down.

Finishing can be divided into two kinds, one is the size trimmed, the other is the

bug fixes.

①

Size trimmed is after molding products, according to design dimensions to cut out

excess superfluous parts;

②

bug fixes, including

perforation repair,

air bubbles, cracks, patches,

broken hole

reinforcement and so on.

3. The characteristics of Hand lay-up